/* roulang page: index */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --bg-2:#101A2E;
  --brand-500:#1FE0C0;
  --brand-600:#12BFA3;
  --brand-300:#7CF3DF;
  --accent-500:#FF7A45;
  --accent-300:#FFB088;
  --data-3:#7C6BFF;
  --text-1:#F2F6FF;
  --text-2:#A9B6CE;
  --text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);
  --line-brand:rgba(31,224,192,.28);
  --ok:#2FD48A;
  --warn:#F5B84A;
  --err:#FF5F6D;
  --r-s:10px;
  --r-m:16px;
  --r-l:22px;
  --r-xl:28px;
  --shadow-1:0 1px 2px rgba(0,0,0,.4);
  --shadow-2:0 12px 32px -12px rgba(0,0,0,.7);
  --ease: cubic-bezier(.22,.61,.36,1);
  --font-cn:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --font-num:'Inter','JetBrains Mono',ui-monospace,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-2);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:4px}
.mono{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}
.section{padding:96px 0;position:relative}
.section--alt{background:var(--bg-1);border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1)}
.eyebrow{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--brand-500);
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:16px;
}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--brand-500);display:block}
h2.section-title{
  font-size:clamp(26px,3.2vw,38px);
  line-height:1.25;
  font-weight:700;
  color:var(--text-1);
  letter-spacing:-.01em;
}
.section-sub{font-size:15px;color:var(--text-3);margin-top:12px;max-width:46ch}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:48px;flex-wrap:wrap}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(5,7,15,.72);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-1);
  transition:background 240ms var(--ease),height 240ms var(--ease);
}
.site-header.is-scrolled{background:rgba(5,7,15,.92)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:76px;transition:height 240ms var(--ease)}
.site-header.is-scrolled .nav-wrap{height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-1);letter-spacing:-.01em}
.logo svg{width:26px;height:26px;color:var(--brand-500);flex:none}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-link{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:8px 2px;
  transition:color 180ms var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:0;width:16px;height:2px;border-radius:2px;
  background:var(--brand-500);box-shadow:0 0 8px rgba(31,224,192,.8);
  transform:translateX(-50%) scaleX(0);transform-origin:center;
  transition:transform 180ms var(--ease);
}
.nav-link:hover{color:var(--text-1)}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{
  color:var(--brand-300);
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.3);
  border-radius:999px;
  padding:8px 16px;
}
.nav-link.active::after{display:none}
.nav-actions{display:flex;align-items:center;gap:16px}
.nav-ghost{font-size:15px;color:var(--text-2);transition:color 180ms var(--ease)}
.nav-ghost:hover{color:var(--brand-300)}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line-1);align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text-1);border-radius:2px;transition:transform 240ms var(--ease),opacity 180ms var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer{
  position:fixed;inset:0;z-index:55;
  background:rgba(5,7,15,.94);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  padding:96px 24px 40px;
  display:none;
}
.drawer.is-open{display:block;animation:fadeDown 240ms var(--ease)}
.drawer a{
  display:block;font-size:20px;color:var(--text-1);
  padding:0 16px;line-height:64px;border-radius:12px;
  border-left:3px solid transparent;
  transition:background 180ms var(--ease),border-color 180ms var(--ease);
}
.drawer a.active{background:rgba(31,224,192,.08);border-left-color:var(--brand-500);color:var(--brand-300)}
.drawer a:not(.active):hover{background:rgba(255,255,255,.04)}
@keyframes fadeDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:999px;
  font-size:15px;font-weight:600;white-space:nowrap;
  transition:transform 240ms var(--ease),box-shadow 240ms var(--ease),background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.btn-primary{
  background:var(--brand-500);color:var(--bg-0);
  box-shadow:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
}
.btn-primary:hover{
  filter:brightness(1.08);transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(31,224,192,.45),0 16px 36px -8px rgba(31,224,192,.55);
}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
  background:transparent;color:var(--text-1);border:1px solid var(--line-1);
}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand-300);transform:translateY(-1px)}
.btn-accent{
  background:var(--accent-500);color:#170B05;
  box-shadow:0 0 0 1px rgba(255,122,69,.35),0 10px 30px -10px rgba(255,122,69,.5);
}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;filter:none}

/* ---------- hero ---------- */
.hero{
  position:relative;
  padding:164px 0 96px;
  background:
    linear-gradient(180deg,rgba(5,7,15,.55) 0%,rgba(5,7,15,.92) 100%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.9;
  mask-image:radial-gradient(ellipse at 20% 30%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at 20% 30%,#000 0%,transparent 78%);
}
.hero::after{
  content:"";position:absolute;left:-180px;top:-120px;width:620px;height:620px;
  background:radial-gradient(circle,rgba(31,224,192,.18),transparent 65%);
  pointer-events:none;
}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:7fr 5fr;gap:64px;align-items:center}
.hero-title{
  font-size:clamp(34px,5.2vw,60px);
  line-height:1.12;
  font-weight:800;
  color:var(--text-1);
  letter-spacing:-.02em;
}
.hero-title em{font-style:normal;color:var(--brand-500)}
.hero-lead{margin-top:22px;font-size:17px;color:var(--text-2);max-width:44ch}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:36px}
.hero-metrics{display:flex;gap:28px;flex-wrap:wrap;margin-top:40px}
.hero-metric{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-2)}
.hero-metric svg{width:16px;height:16px;color:var(--brand-500);flex:none}
.hero-metric b{font-family:var(--font-num);font-weight:700;color:var(--text-1);font-variant-numeric:tabular-nums}
.hero-cards{position:relative;display:grid;gap:16px}
.hcard{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line-1);
  border-radius:var(--r-l);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12),var(--shadow-2);
  padding:24px;
}
.hcard:nth-child(2){transform:translateX(18px)}
.hcard-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.hcard-label{font-size:13px;color:var(--text-3)}
.hcard-value{font-family:var(--font-num);font-size:36px;font-weight:700;color:var(--text-1);letter-spacing:-.02em;line-height:1.2;margin-top:8px}
.hcard-value small{font-size:14px;font-weight:500;color:var(--text-3);margin-left:4px}
.trend{display:inline-flex;align-items:center;gap:4px;font-family:var(--font-num);font-size:13px;font-weight:600}
.trend.up{color:var(--brand-500)}
.trend.warm{color:var(--accent-500)}
.hcard-bar{height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand-500),var(--accent-500));width:64px;margin-top:16px}
.hcard-foot{margin-top:14px;padding-top:14px;border-top:1px solid var(--line-1);font-size:13px;color:var(--text-3)}

/* ---------- metrics board ---------- */
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.metric-card{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid var(--line-1);
  border-radius:var(--r-l);
  padding:24px;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--shadow-1);
  transition:transform 240ms var(--ease),border-color 180ms var(--ease);
}
.metric-card:hover{transform:translateY(-2px);border-color:var(--line-brand)}
.metric-icon{
  width:40px;height:40px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(31,224,192,.1);border:1px solid rgba(31,224,192,.22);
  color:var(--brand-500);
}
.metric-icon svg{width:20px;height:20px}
.metric-num{font-family:var(--font-num);font-size:36px;font-weight:700;color:var(--text-1);letter-spacing:-.02em;line-height:1.1;margin-top:20px}
.metric-num small{font-size:14px;font-weight:500;color:var(--text-3);margin-left:6px}
.metric-divider{height:1px;background:var(--line-1);margin:16px 0}
.metric-note{font-size:13px;color:var(--text-3);line-height:1.7}
.metric-bar{height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand-500),var(--accent-500));width:64px;margin-top:14px;opacity:.9}

/* ---------- service matrix ---------- */
.matrix{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start}
.matrix-list{border-top:1px solid var(--line-1)}
.matrix-item{
  position:relative;
  display:flex;gap:20px;align-items:flex-start;
  padding:26px 20px 26px 16px;
  border-bottom:1px solid var(--line-1);
  transition:background 180ms var(--ease);
}
.matrix-item::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:3px;
  background:linear-gradient(180deg,var(--brand-500),var(--brand-600));
  transform:scaleY(0);transform-origin:top;
  transition:transform 240ms var(--ease);
}
.matrix-item:hover{background:rgba(255,255,255,.03)}
.matrix-item:hover::before{transform:scaleY(1)}
.matrix-no{font-family:var(--font-num);font-size:15px;font-weight:700;color:var(--brand-500);width:48px;flex:none;padding-top:2px}
.matrix-body h3{font-size:20px;line-height:1.4;font-weight:600;color:var(--text-1)}
.matrix-body p{font-size:14px;color:var(--text-3);margin-top:6px;line-height:1.8}
.matrix-arrow{margin-left:auto;color:var(--text-3);flex:none;padding-top:4px;transition:transform 240ms var(--ease),color 180ms var(--ease)}
.matrix-item:hover .matrix-arrow{transform:translateX(4px);color:var(--brand-500)}
.matrix-arrow svg{width:18px;height:18px}
.matrix-figure{position:relative;border-radius:var(--r-l);overflow:hidden;border:1px solid var(--line-1);background:var(--bg-2)}
.matrix-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform 1.2s var(--ease)}
.matrix-figure:hover img{transform:scale(1.04)}
.matrix-tag{
  position:absolute;left:20px;bottom:20px;
  background:rgba(5,7,15,.7);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--line-1);border-radius:999px;
  padding:8px 16px;font-size:13px;color:var(--text-1);
}

/* ---------- compare ---------- */
.compare{
  position:relative;
  display:grid;grid-template-columns:1fr 1fr;
  border:1px solid var(--line-1);border-radius:var(--r-xl);
  overflow:hidden;
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
}
.compare::after{
  content:"";position:absolute;left:50%;top:8%;bottom:8%;width:1px;
  background:linear-gradient(180deg,transparent,rgba(31,224,192,.55),transparent);
}
.compare-col{padding:32px}
.compare-col h3{font-size:20px;font-weight:600;color:var(--text-1);margin-bottom:20px;display:flex;align-items:center;gap:10px}
.compare-col h3 span.dot{width:8px;height:8px;border-radius:50%;display:block}
.compare-col.plain h3 span.dot{background:var(--text-3)}
.compare-col.better h3 span.dot{background:var(--brand-500);box-shadow:0 0 10px rgba(31,224,192,.7)}
.compare-list li{
  display:flex;align-items:flex-start;gap:12px;
  padding:14px 0;border-bottom:1px solid var(--line-1);
  font-size:15px;line-height:1.7;
}
.compare-list li:last-child{border-bottom:0}
.compare-col.plain .compare-list li{color:var(--text-3)}
.compare-col.plain .compare-list .mark{width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.18);margin-top:10px;flex:none}
.compare-col.better .compare-list li{color:var(--text-1)}
.compare-col.better .compare-list .mark{color:var(--brand-500);flex:none;margin-top:4px}
.compare-col.better .compare-list .mark svg{width:16px;height:16px}
.bars{margin-top:48px;display:grid;gap:20px}
.bar-row{display:grid;grid-template-columns:180px 1fr 64px;gap:16px;align-items:center;font-size:14px}
.bar-track{height:6px;border-radius:999px;background:rgba(255,255,255,.05);overflow:hidden}
.bar-fill{height:100%;width:0;border-radius:999px;transition:width 600ms var(--ease)}
.bar-fill.b1{background:linear-gradient(90deg,var(--brand-600),var(--brand-500))}
.bar-fill.b2{background:linear-gradient(90deg,#E0632F,var(--accent-500))}
.bar-fill.b3{background:linear-gradient(90deg,var(--brand-600),var(--brand-500))}
.bar-fill.b4{background:linear-gradient(90deg,#E0632F,var(--accent-500))}
.bar-val{font-family:var(--font-num);font-weight:700;color:var(--text-1);text-align:right}

/* ---------- quote / evidence ---------- */
.quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.quote-card{
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  border:1px solid var(--line-1);border-radius:var(--r-l);
  padding:28px 24px;
  display:flex;flex-direction:column;gap:18px;
  transition:transform 240ms var(--ease),border-color 180ms var(--ease);
}
.quote-card:hover{transform:translateY(-2px);border-color:var(--line-brand)}
.quote-card p{font-size:15px;color:var(--text-2);line-height:1.9}
.quote-user{display:flex;align-items:center;gap:12px;margin-top:auto;padding-top:16px;border-top:1px solid var(--line-1)}
.quote-avatar{
  width:36px;height:36px;border-radius:50%;flex:none;
  background:rgba(31,224,192,.1);border:1px solid rgba(31,224,192,.25);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-num);font-size:13px;font-weight:700;color:var(--brand-300);
}
.quote-user span{font-size:13px;color:var(--text-3)}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  border:1px solid var(--line-1);border-radius:var(--r-l);
  overflow:hidden;
  transition:transform 240ms var(--ease),border-color 180ms var(--ease),box-shadow 240ms var(--ease);
}
.news-card:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:var(--shadow-2)}
.news-cover{position:relative;background:var(--bg-2);overflow:hidden}
.news-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform 1.2s var(--ease)}
.news-card:hover .news-cover img{transform:scale(1.04)}
.news-body{padding:22px;display:flex;flex-direction:column;gap:12px;flex:1}
.badge{
  display:inline-flex;align-items:center;
  align-self:flex-start;
  font-size:12px;line-height:1;
  padding:7px 12px;border-radius:999px;
  background:rgba(31,224,192,.1);
  color:var(--brand-300);
  border:1px solid rgba(31,224,192,.22);
}
.news-body h3{font-size:18px;font-weight:600;line-height:1.5;color:var(--text-1);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-body p{font-size:14px;line-height:1.7;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{margin-top:auto;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-3);padding-top:12px;border-top:1px solid var(--line-1)}
.news-meta .arrow{transition:transform 240ms var(--ease);color:var(--brand-500)}
.news-card:hover .news-meta .arrow{transform:translateX(4px)}
.news-card--wide{grid-column:span 2;flex-direction:row}
.news-card--wide .news-cover{width:46%;flex:none}
.news-card--wide .news-cover img{height:100%;aspect-ratio:auto}
.link-more{display:inline-flex;align-items:center;gap:6px;font-size:15px;color:var(--brand-300);transition:gap 240ms var(--ease)}
.link-more:hover{gap:10px}
.empty-state{
  min-height:240px;border:1px dashed var(--line-1);border-radius:var(--r-l);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  color:var(--text-3);text-align:center;padding:32px;
}
.empty-state svg{width:32px;height:32px;color:var(--text-3)}
.empty-state p{font-size:15px}
.empty-state a{font-size:14px;color:var(--brand-300);border-bottom:1px solid var(--line-brand);padding-bottom:2px}

/* ---------- FAQ ---------- */
.faq-list{border-top:1px solid var(--line-1)}
.faq-item{border-bottom:1px solid var(--line-1)}
.faq-q{
  width:100%;display:flex;align-items:center;gap:16px;
  min-height:68px;padding:18px 4px;text-align:left;
  font-size:17px;font-weight:600;color:var(--text-1);
  transition:color 180ms var(--ease);
}
.faq-q:hover{color:var(--brand-300)}
.faq-plus{
  width:24px;height:24px;border-radius:50%;flex:none;
  border:1px solid var(--line-brand);color:var(--brand-500);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;line-height:1;
  transition:transform 240ms var(--ease),background 180ms var(--ease),color 180ms var(--ease);
}
.faq-item.is-open .faq-plus{transform:rotate(45deg);background:var(--brand-500);color:var(--bg-0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 320ms var(--ease)}
.faq-a-inner{padding:0 0 22px 40px;font-size:17px;line-height:1.9;color:var(--text-2);max-width:72ch}

/* ---------- form ---------- */
.contact{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start}
.contact-points{margin-top:28px;display:grid;gap:16px}
.contact-points li{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:var(--text-2)}
.contact-points svg{width:18px;height:18px;color:var(--brand-500);flex:none;margin-top:5px}
.contact-line{margin-top:32px;padding-top:24px;border-top:1px solid var(--line-1);font-size:14px;color:var(--text-3);display:flex;gap:24px;flex-wrap:wrap}
.contact-line b{color:var(--text-1);font-family:var(--font-num)}
.form-card{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line-1);border-radius:24px;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12),var(--shadow-2);
  padding:32px;
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.field label{font-size:13px;color:var(--text-3)}
.field input,.field select,.field textarea{
  width:100%;background:rgba(255,255,255,.04);
  border:1px solid var(--line-1);border-radius:12px;
  padding:0 16px;height:48px;color:var(--text-1);
  transition:border-color 180ms var(--ease),box-shadow 180ms var(--ease),background 180ms var(--ease);
  appearance:none;
}
.field textarea{height:auto;min-height:112px;padding:14px 16px;line-height:1.7;resize:vertical}
.field select{background-image:linear-gradient(45deg,transparent 50%,var(--text-2) 50%),linear-gradient(135deg,var(--text-2) 50%,transparent 50%);background-position:calc(100% - 20px) 21px,calc(100% - 14px) 21px;background-size:6px 6px,6px 6px;background-repeat:no-repeat}
.field select option{background:var(--bg-2);color:var(--text-1)}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand-500);
  box-shadow:0 0 0 3px rgba(31,224,192,.18);
  background:rgba(255,255,255,.06);
}
.field.error input,.field.error select,.field.error textarea{border-color:var(--err);box-shadow:0 0 0 3px rgba(255,95,109,.14)}
.field .err-msg{font-size:13px;color:var(--err);display:none}
.field.error .err-msg{display:block}
.check{display:flex;align-items:flex-start;gap:12px;font-size:14px;color:var(--text-3);cursor:pointer;user-select:none}
.check input{position:absolute;opacity:0;width:0;height:0}
.check .box{
  width:18px;height:18px;border-radius:5px;flex:none;margin-top:4px;
  border:1px solid var(--line-1);background:rgba(255,255,255,.04);
  display:flex;align-items:center;justify-content:center;
  transition:background 180ms var(--ease),border-color 180ms var(--ease);
}
.check .box svg{width:12px;height:12px;color:var(--bg-0);opacity:0;transition:opacity 180ms var(--ease)}
.check input:checked + .box{background:var(--brand-500);border-color:var(--brand-500)}
.check input:checked + .box svg{opacity:1}
.check input:focus-visible + .box{outline:2px solid var(--brand-500);outline-offset:2px}
.form-actions{margin-top:24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.form-hint{font-size:13px;color:var(--text-3)}
.form-status{margin-top:16px;font-size:14px;color:var(--ok);display:none}
.form-status.show{display:block}
.spinner{
  width:16px;height:16px;border-radius:50%;
  border:2px solid rgba(23,11,5,.3);border-top-color:#170B05;
  animation:spin 700ms linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-1);border-top:1px solid var(--line-1);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand .logo{margin-bottom:16px}
.footer-brand p{font-size:14px;color:var(--text-3);max-width:30ch;line-height:1.8}
.footer-social{display:flex;gap:12px;margin-top:20px}
.footer-social a{
  width:36px;height:36px;border-radius:10px;border:1px solid var(--line-1);
  display:flex;align-items:center;justify-content:center;color:var(--text-3);
  transition:color 180ms var(--ease),border-color 180ms var(--ease),transform 240ms var(--ease);
}
.footer-social a:hover{color:var(--brand-300);border-color:var(--line-brand);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px}
.footer-col h4{font-size:14px;font-weight:600;color:var(--text-1);margin-bottom:18px;letter-spacing:.02em}
.footer-col li{margin-bottom:12px}
.footer-col a{
  position:relative;display:inline-block;font-size:14px;color:var(--text-3);
  padding-left:10px;
  transition:color 180ms var(--ease),padding-left 240ms var(--ease);
}
.footer-col a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:3px;border-radius:50%;background:var(--brand-500);
  opacity:0;transition:opacity 180ms var(--ease);
}
.footer-col a:hover{color:var(--text-1);padding-left:14px}
.footer-col a:hover::before{opacity:1}
.footer-info li{font-size:14px;color:var(--text-3);margin-bottom:12px}
.footer-info b{color:var(--text-2);font-family:var(--font-num);font-weight:600}
.footer-bottom{
  margin-top:48px;border-top:1px solid var(--line-1);
  padding:24px 0 32px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--text-3);
}
.footer-bottom .fine{font-size:12px;color:var(--text-3);opacity:.85;width:100%}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 600ms var(--ease),transform 600ms var(--ease)}
.reveal.is-in{opacity:1;transform:translateY(0)}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .hero-inner{gap:40px}
}
@media (max-width:992px){
  .section{padding:64px 0}
  .hero{padding:140px 0 72px}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-cards{grid-template-columns:1fr 1fr}
  .hcard:nth-child(2){transform:none}
  .metric-grid{grid-template-columns:repeat(2,1fr)}
  .matrix{grid-template-columns:1fr}
  .matrix-figure{order:2}
  .compare{grid-template-columns:1fr}
  .compare::after{display:none}
  .quote-grid{grid-template-columns:1fr 1fr}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .news-card--wide{grid-column:span 2}
  .contact{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .nav-links{display:none}
  .nav-actions{display:none}
  .nav-toggle{display:flex}
}
@media (max-width:768px){
  .container{padding:0 18px}
  .section{padding:48px 0}
  .hero{padding:120px 0 56px}
  .hero-cards{grid-template-columns:1fr}
  .metric-grid{grid-template-columns:1fr}
  .quote-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .news-card--wide{grid-column:span 1;flex-direction:column}
  .news-card--wide .news-cover{width:100%}
  .news-card--wide .news-cover img{aspect-ratio:16/9;height:auto}
  .form-row{grid-template-columns:1fr}
  .bar-row{grid-template-columns:120px 1fr 56px;font-size:13px}
  .faq-a-inner{padding-left:0}
  .section-head{margin-bottom:32px}
}
@media (max-width:480px){
  body{font-size:15px}
  .section{padding:32px 0}
  .hero-title{font-size:clamp(28px,8vw,38px)}
  .metric-num,.hcard-value{font-size:30px}
  .btn{width:100%}
  .hero-actions{flex-direction:column;align-items:stretch}
  .footer-grid{grid-template-columns:1fr}
  .compare-col{padding:24px 18px}
  .form-card{padding:22px 18px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category1 */
:root{
  --bg-0:#05070F;--bg-1:#0A1020;--bg-2:#101A2E;
  --brand-500:#1FE0C0;--brand-600:#12BFA3;--brand-300:#7CF3DF;
  --accent-500:#FF7A45;--accent-300:#FFB088;--data-3:#7C6BFF;
  --text-1:#F2F6FF;--text-2:#A9B6CE;--text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);--line-brand:rgba(31,224,192,.28);
  --ok:#2FD48A;--warn:#F5B84A;--err:#FF5F6D;
  --r-s:10px;--r-m:16px;--r-l:22px;--r-xl:28px;--r-pill:999px;
  --sh-1:0 1px 2px rgba(0,0,0,.4);--sh-2:0 12px 32px -12px rgba(0,0,0,.7);
  --glow-brand:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
  --glass:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  --font-cn:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --font-mono:'Inter','JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg-0);color:var(--text-2);
  font-family:var(--font-cn);font-size:16px;line-height:1.9;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(900px 520px at 12% -8%,rgba(31,224,192,.10),transparent 62%),
             radial-gradient(760px 480px at 92% 4%,rgba(255,122,69,.07),transparent 60%);
}
h1,h2,h3,h4{margin:0;color:var(--text-1);font-weight:700;line-height:1.25}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
svg{display:block}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px}
::selection{background:rgba(31,224,192,.28);color:#fff}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px;position:relative;z-index:1}

/* ---------- 导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(5,7,15,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-1);
  transition:background 180ms var(--ease);
}
.site-header.is-scrolled{background:rgba(5,7,15,.92)}
.header-inner{display:flex;align-items:center;gap:28px;height:76px;transition:height 240ms var(--ease)}
.site-header.is-scrolled .header-inner{height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-1);white-space:nowrap}
.logo svg{width:26px;height:26px;color:var(--brand-500);flex:0 0 26px}
.nav-links{display:flex;align-items:center;gap:32px;margin-left:auto}
.nav-link{
  position:relative;font-size:15px;color:var(--text-2);padding:10px 2px;
  transition:color 180ms var(--ease);white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:2px;width:0;height:2px;border-radius:2px;
  background:var(--brand-500);box-shadow:0 0 8px rgba(31,224,192,.8);
  transform:translateX(-50%);transition:width 240ms var(--ease);
}
.nav-link:hover{color:var(--text-1)}
.nav-link:hover::after{width:16px}
.nav-link.active{
  padding:12px 16px;border-radius:var(--r-pill);
  background:rgba(31,224,192,.10);color:var(--brand-300);
  border:1px solid rgba(31,224,192,.3);
}
.nav-link.active::after{display:none}
.nav-actions{display:flex;align-items:center;gap:16px;margin-left:4px}
.nav-text-link{font-size:15px;color:var(--text-2);transition:color 180ms var(--ease);white-space:nowrap}
.nav-text-link:hover{color:var(--brand-300)}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line-1);align-items:center;justify-content:center;
  color:var(--text-1);transition:border-color 180ms var(--ease),background 180ms var(--ease);
}
.nav-toggle:hover{border-color:var(--line-brand);background:rgba(255,255,255,.03)}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:currentColor;margin:3px 0}

/* ---------- 移动抽屉 ---------- */
.mobile-drawer{
  position:fixed;inset:0;z-index:70;padding:88px 24px 40px;overflow-y:auto;
  background:rgba(5,7,15,.92);backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  transform:translateX(100%);opacity:0;visibility:hidden;
  transition:transform 300ms var(--ease),opacity 300ms var(--ease),visibility 300ms;
}
.mobile-drawer.is-open{transform:translateX(0);opacity:1;visibility:visible}
.mobile-drawer a{
  display:block;position:relative;font-size:20px;line-height:64px;
  color:var(--text-2);border-bottom:1px solid var(--line-1);padding-left:14px;
}
.mobile-drawer a.active{color:var(--brand-300)}
.mobile-drawer a.active::before{
  content:"";position:absolute;left:0;top:20px;bottom:20px;width:3px;
  border-radius:3px;background:var(--brand-500);
}
.mobile-drawer .drawer-close{
  position:absolute;top:22px;right:22px;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line-1);display:flex;align-items:center;justify-content:center;color:var(--text-1);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;line-height:1;white-space:nowrap;
  transition:transform 240ms var(--ease),box-shadow 240ms var(--ease),
             background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--brand-500);color:#05070F;box-shadow:var(--glow-brand)}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.45),0 16px 36px -8px rgba(31,224,192,.55)}
.btn-primary:active{transform:translateY(0);background:var(--brand-600)}
.btn-ghost{background:transparent;border:1px solid var(--line-1);color:var(--text-1)}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand-300);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(0)}
.btn-accent{background:var(--accent-500);color:#220B02;box-shadow:0 0 0 1px rgba(255,122,69,.35),0 10px 30px -10px rgba(255,122,69,.5)}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px);box-shadow:0 0 0 1px rgba(255,122,69,.45),0 16px 36px -10px rgba(255,122,69,.62)}
.btn-accent:active{transform:translateY(0)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn[disabled],.btn.is-disabled{opacity:.5;cursor:not-allowed;transform:none}

/* ---------- 首屏 ---------- */
.page-hero{
  position:relative;padding:152px 0 72px;overflow:hidden;
  background:linear-gradient(180deg,var(--bg-1) 0%,var(--bg-0) 100%);
}
.page-hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:.30;filter:saturate(120%);
}
.page-hero::before{
  content:"";position:absolute;inset:0;z-index:0;
  background:linear-gradient(180deg,rgba(5,7,15,.55),rgba(5,7,15,.92));
}
.page-hero::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.05;
  background-image:linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
  background-size:24px 24px;
}
.page-hero-inner,.page-hero .container{position:relative;z-index:2}
.eyebrow{
  font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--brand-500);font-weight:600;margin-bottom:16px;
}
.page-hero h1{
  font-size:clamp(34px,5.2vw,60px);line-height:1.12;font-weight:800;
  max-width:15em;letter-spacing:-.01em;
}
.hero-lead{margin-top:20px;font-size:17px;line-height:1.95;color:var(--text-2);max-width:54ch}
.hero-lead + .hero-lead{margin-top:10px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-meta{display:flex;flex-wrap:wrap;gap:32px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line-1)}
.hero-meta div{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3)}
.hero-meta svg{width:16px;height:16px;color:var(--brand-500)}
.hero-meta b{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--text-1);font-weight:700}
.hero-banner{
  margin:48px 0 0;position:relative;z-index:2;border-radius:var(--r-l);
  overflow:hidden;border:1px solid var(--line-1);box-shadow:var(--sh-2);
  aspect-ratio:1240/320;background:var(--bg-2);
}
.hero-banner img{width:100%;height:100%;object-fit:cover}

/* ---------- 通用板块 ---------- */
.section{padding:96px 0;position:relative;z-index:1}
.section-alt{
  background:var(--bg-1);
  border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1);
}
.section-head{max-width:760px;margin-bottom:48px}
.section-head h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25}
.section-head p{margin-top:16px;font-size:16px;color:var(--text-2)}

/* ---------- 双栏要点 ---------- */
.split{
  display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);
  gap:64px;align-items:center;
}
.split-text h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25}
.split-text > p{margin-top:20px;font-size:16px;color:var(--text-2)}
.split-text > p + p{margin-top:14px}
.split-media{
  margin:0;position:relative;border-radius:var(--r-l);overflow:hidden;
  border:1px solid var(--line-1);box-shadow:var(--sh-2);background:var(--bg-2);
}
.split-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  transition:transform 1.2s var(--ease);
}
.split-media:hover img{transform:scale(1.04)}
.media-tag{
  position:absolute;left:18px;top:18px;display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:var(--r-pill);font-size:12px;letter-spacing:.04em;
  color:var(--brand-300);background:rgba(5,7,15,.62);
  border:1px solid var(--line-brand);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.media-tag svg{width:14px;height:14px}

/* ---------- 勾选清单 ---------- */
.check-list{margin-top:28px;border-top:1px solid var(--line-1)}
.check-list li{
  display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line-1);
  font-size:15px;line-height:1.85;color:var(--text-2);
}
.check-list li svg{flex:0 0 20px;width:20px;height:20px;color:var(--brand-500);margin-top:5px}
.check-list li b{color:var(--text-1);font-weight:600}

/* ---------- 编号条列 ---------- */
.num-list{border-top:1px solid var(--line-1)}
.num-list li{
  position:relative;display:grid;grid-template-columns:64px 1fr 40px;
  gap:24px;align-items:center;padding:28px 24px;
  border-bottom:1px solid var(--line-1);
  transition:background 180ms var(--ease);
}
.num-list li::before{
  content:"";position:absolute;left:0;top:12px;bottom:12px;width:3px;
  border-radius:3px;background:var(--brand-500);opacity:0;
  transition:opacity 180ms var(--ease);
}
.num-list li:hover{background:rgba(255,255,255,.03)}
.num-list li:hover::before{opacity:1}
.num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:22px;font-weight:700;color:var(--brand-500);letter-spacing:.02em;
}
.num-item h3{font-size:20px;line-height:1.4;margin-bottom:8px}
.num-item p{font-size:15px;line-height:1.85;color:var(--text-2);max-width:68ch}
.num-arrow{
  display:flex;align-items:center;justify-content:flex-end;
  color:var(--text-3);transition:transform 240ms var(--ease),color 180ms var(--ease);
}
.num-arrow svg{width:18px;height:18px}
.num-list li:hover .num-arrow{transform:translateX(4px);color:var(--brand-300)}

/* ---------- 玻璃 CTA 横条 ---------- */
.cta-bar{
  display:flex;align-items:center;justify-content:space-between;gap:40px;
  padding:40px;border-radius:var(--r-xl);border:1px solid var(--line-1);
  background:var(--glass);backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12),var(--sh-2);
}
.cta-bar h2{font-size:clamp(22px,2.6vw,30px);line-height:1.3}
.cta-bar p{margin-top:12px;font-size:15px;color:var(--text-2);max-width:46ch}
.cta-bar-actions{display:flex;flex-wrap:wrap;gap:14px;flex:0 0 auto}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--bg-1);border-top:1px solid var(--line-1);
  padding:64px 0 0;position:relative;z-index:1;
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:48px}
.footer-brand .logo{font-size:17px}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.8;color:var(--text-3);max-width:24em}
.footer-social{display:flex;gap:12px;margin-top:22px}
.footer-social a{
  width:38px;height:38px;border-radius:12px;border:1px solid var(--line-1);
  display:inline-flex;align-items:center;justify-content:center;color:var(--text-3);
  transition:color 180ms var(--ease),border-color 180ms var(--ease),transform 240ms var(--ease);
}
.footer-social a:hover{color:var(--brand-300);border-color:var(--line-brand);transform:translateY(-2px)}
.footer-social svg{width:18px;height:18px}
.footer-col h4{font-size:15px;color:var(--text-1);margin-bottom:18px;letter-spacing:.01em}
.footer-col ul{display:flex;flex-direction:column;gap:12px}
.footer-col a{
  position:relative;display:inline-block;font-size:14px;color:var(--text-3);
  padding-left:0;transition:color 180ms var(--ease),padding-left 240ms var(--ease);
}
.footer-col a::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:3px;border-radius:50%;
  background:var(--brand-500);transform:translateY(-50%);opacity:0;
  transition:opacity 180ms var(--ease);
}
.footer-col a:hover{color:var(--text-1);padding-left:12px}
.footer-col a:hover::before{opacity:1}
.footer-info li{font-size:14px;color:var(--text-3)}
.footer-info b{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--text-2);font-weight:600}
.footer-bottom{
  margin-top:56px;border-top:1px solid var(--line-1);padding:24px 0 32px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  font-size:12px;line-height:1.7;color:var(--text-3);
}
.footer-bottom span{display:inline-block}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 600ms var(--ease),transform 600ms var(--ease)}
.reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

/* ---------- 断点 ---------- */
@media (max-width:1200px){
  .nav-links{gap:22px}
  .header-inner{gap:20px}
}
@media (max-width:992px){
  .split{grid-template-columns:1fr;gap:40px}
  .split-media{order:2}
  .split-text{order:1}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
  .num-list li{grid-template-columns:48px 1fr;gap:18px;padding:24px 16px}
  .num-arrow{display:none}
  .cta-bar{flex-direction:column;align-items:flex-start;gap:28px}
}
@media (max-width:900px){
  .nav-links{display:none}
  .nav-text-link{display:none}
  .nav-actions .btn{display:none}
  .nav-toggle{display:inline-flex}
  .header-inner{height:60px;gap:14px}
  .site-header.is-scrolled .header-inner{height:60px}
}
@media (max-width:768px){
  .section{padding:64px 0}
  .page-hero{padding:118px 0 52px}
  .hero-banner{aspect-ratio:16/9;margin-top:32px}
  .hero-meta{gap:20px}
  .section-head{margin-bottom:32px}
  .cta-bar{padding:28px;border-radius:var(--r-l)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:520px){
  body{font-size:15px}
  .container{padding:0 18px}
  .section{padding:48px 0}
  .page-hero{padding:104px 0 40px}
  .page-hero h1{font-size:30px}
  .hero-lead{font-size:16px}
  .hero-actions,.cta-bar-actions{flex-direction:column;width:100%}
  .hero-actions .btn,.cta-bar-actions .btn{width:100%}
  .num-list li{grid-template-columns:1fr;gap:8px}
  .num{font-size:18px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
}

/* roulang page: article */
/* ============ 设计变量 ============ */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --bg-2:#101A2E;
  --brand-500:#1FE0C0;
  --brand-600:#12BFA3;
  --brand-300:#7CF3DF;
  --accent-500:#FF7A45;
  --accent-300:#FFB088;
  --data-3:#7C6BFF;
  --text-1:#F2F6FF;
  --text-2:#A9B6CE;
  --text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);
  --line-brand:rgba(31,224,192,.28);
  --ok:#2FD48A;
  --warn:#F5B84A;
  --err:#FF5F6D;
  --r-s:10px;
  --r-m:16px;
  --r-l:22px;
  --r-xl:28px;
  --pill:999px;
  --sp-4:4px; --sp-8:8px; --sp-12:12px; --sp-16:16px; --sp-24:24px;
  --sp-32:32px; --sp-48:48px; --sp-64:64px; --sp-96:96px;
  --shadow-1:0 1px 2px rgba(0,0,0,.4);
  --shadow-2:0 12px 32px -12px rgba(0,0,0,.7);
  --t-color:180ms cubic-bezier(.22,.61,.36,1);
  --t-move:240ms cubic-bezier(.22,.61,.36,1);
  --font-cn:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --font-num:'Inter','JetBrains Mono',ui-monospace,monospace;
}
/* ============ 基础 reset ============ */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-2);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.nav-open{overflow:hidden;}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color var(--t-color),border-color var(--t-color),background-color var(--t-color);}
button,input,select,textarea{font:inherit;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:4px;}
::selection{background:rgba(31,224,192,.28);color:#fff;}
/* ============ 容器与排版 ============ */
.container{
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding:0 24px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--brand-500);
  margin-bottom:16px;
}
.eyebrow::before{
  content:"";
  width:20px;height:1px;
  background:linear-gradient(90deg,var(--brand-500),transparent);
}
h2.section-title{
  font-size:clamp(26px,3.2vw,38px);
  line-height:1.25;
  font-weight:700;
  color:var(--text-1);
  letter-spacing:-.01em;
}
.section-sub{
  margin-top:12px;
  font-size:15px;
  color:var(--text-2);
  max-width:60ch;
}
section{position:relative;}
/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 26px;
  border-radius:var(--pill);
  font-size:15px;
  font-weight:600;
  border:1px solid transparent;
  cursor:pointer;
  white-space:nowrap;
  transition:transform var(--t-move),background-color var(--t-color),border-color var(--t-color),color var(--t-color),box-shadow var(--t-move),filter var(--t-color);
}
.btn-primary{
  background:var(--brand-500);
  color:#04120F;
  box-shadow:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
}
.btn-primary:hover{
  filter:brightness(1.08);
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(31,224,192,.45),0 16px 38px -8px rgba(31,224,192,.55);
}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{
  background:transparent;
  border-color:var(--line-1);
  color:var(--text-1);
}
.btn-ghost:hover{
  border-color:var(--line-brand);
  color:var(--brand-300);
  transform:translateY(-1px);
}
.btn-accent{
  background:var(--accent-500);
  color:#1A0A02;
  box-shadow:0 0 0 1px rgba(255,122,69,.35),0 10px 30px -8px rgba(255,122,69,.45);
}
.btn-accent:hover{filter:brightness(1.08);transform:translateY(-1px);}
.btn-sm{height:40px;padding:0 20px;font-size:14px;}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;}
.btn .i{width:16px;height:16px;}
/* ============ 顶部导航 ============ */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:80;
  height:76px;
  display:flex;
  align-items:center;
  background:rgba(5,7,15,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-1);
  transition:height var(--t-move),background-color var(--t-color);
}
html.scrolled .site-header{
  height:64px;
  background:rgba(5,7,15,.92);
}
.nav-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:18px;
  font-weight:700;
  color:var(--text-1);
  letter-spacing:-.01em;
}
.logo svg{
  width:26px;height:26px;
  color:var(--brand-500);
  flex:0 0 auto;
}
.logo span{white-space:nowrap;}
.nav-links{
  display:flex;
  align-items:center;
  gap:32px;
}
.nav-link{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:6px 0;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:50%;bottom:-2px;
  width:16px;height:2px;
  border-radius:2px;
  background:var(--brand-500);
  box-shadow:0 0 8px rgba(31,224,192,.75);
  transform:translateX(-50%) scaleX(0);
  transform-origin:center;
  transition:transform var(--t-move);
}
.nav-link:hover{color:var(--text-1);}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1);}
.nav-link.active{
  color:var(--brand-300);
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.3);
  border-radius:var(--pill);
  padding:8px 16px;
}
.nav-link.active::after{display:none;}
.nav-actions{
  display:flex;
  align-items:center;
  gap:16px;
}
.nav-entry{
  font-size:14px;
  color:var(--text-2);
}
.nav-entry:hover{color:var(--brand-300);}
.nav-toggle{
  display:none;
  width:40px;height:40px;
  border:1px solid var(--line-1);
  border-radius:12px;
  background:transparent;
  cursor:pointer;
  padding:0;
  position:relative;
}
.nav-toggle span{
  position:absolute;
  left:11px;
  width:16px;height:2px;
  border-radius:2px;
  background:var(--text-1);
  transition:transform var(--t-move),opacity var(--t-color);
}
.nav-toggle span:nth-child(1){top:13px;}
.nav-toggle span:nth-child(2){top:19px;}
.nav-toggle span:nth-child(3){top:25px;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
/* ============ 文章头部 ============ */
.page-main{padding-top:76px;}
html.scrolled .page-main{padding-top:64px;}
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:32px 0 0;
  font-size:12px;
  color:var(--text-3);
}
.crumbs a{color:var(--text-3);}
.crumbs a:hover{color:var(--brand-300);}
.crumbs .sep{opacity:.6;}
.crumbs .now{color:var(--text-2);}
.article-head{padding:24px 0 0;}
.article-head h1{
  font-size:clamp(28px,4vw,40px);
  line-height:1.28;
  font-weight:700;
  color:var(--text-1);
  letter-spacing:-.015em;
  max-width:24ch;
}
.article-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px;
  margin-top:22px;
  font-size:13px;
  color:var(--text-3);
}
.article-meta .divider{
  width:1px;height:12px;
  background:var(--line-1);
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:26px;
  padding:0 12px;
  border-radius:var(--pill);
  font-size:12px;
  font-weight:600;
  color:var(--brand-300);
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.22);
}
.mono{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}
.article-cover{
  margin:32px 0 0;
  border-radius:var(--r-l);
  overflow:hidden;
  border:1px solid var(--line-1);
  background:var(--bg-2);
  aspect-ratio:21/9;
}
.article-cover img{
  width:100%;height:100%;
  object-fit:cover;
}
/* ============ 正文布局 ============ */
.article-layout{
  display:grid;
  grid-template-columns:minmax(0,8fr) minmax(0,4fr);
  gap:48px;
  padding:56px 0 96px;
  align-items:start;
}
.article-body{
  min-width:0;
}
.article-content{
  font-size:17px;
  line-height:2;
  color:var(--text-2);
  text-align:left;
  word-break:break-word;
}
.article-content > *:first-child{margin-top:0;}
.article-content p{margin:1.2em 0;}
.article-content h2{
  position:relative;
  font-size:28px;
  line-height:1.35;
  font-weight:700;
  color:var(--text-1);
  margin:48px 0 16px;
  padding-left:18px;
  letter-spacing:-.01em;
}
.article-content h2::before{
  content:"";
  position:absolute;
  left:0;top:.34em;
  width:4px;height:22px;
  border-radius:2px;
  background:linear-gradient(180deg,var(--brand-500),var(--brand-600));
}
.article-content h3{
  font-size:22px;
  line-height:1.4;
  font-weight:600;
  color:var(--text-1);
  margin:36px 0 12px;
}
.article-content h4{
  font-size:18px;
  font-weight:600;
  color:var(--text-1);
  margin:28px 0 10px;
}
.article-content a{
  color:var(--brand-300);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:4px;
}
.article-content a:hover{color:var(--brand-500);}
.article-content strong{color:var(--text-1);font-weight:600;}
.article-content ul{list-style:none;padding-left:0;margin:16px 0;}
.article-content ul li{
  position:relative;
  padding-left:22px;
  margin:10px 0;
}
.article-content ul li::before{
  content:"";
  position:absolute;
  left:4px;top:.86em;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--brand-500);
  box-shadow:0 0 8px rgba(31,224,192,.6);
}
.article-content ol{
  counter-reset:olc;
  list-style:none;
  padding-left:0;
  margin:16px 0;
}
.article-content ol li{
  counter-increment:olc;
  position:relative;
  padding-left:40px;
  margin:12px 0;
}
.article-content ol li::before{
  content:counter(olc,decimal-leading-zero);
  position:absolute;
  left:0;top:.28em;
  font-family:var(--font-num);
  font-size:13px;
  font-weight:700;
  color:var(--brand-500);
  letter-spacing:.02em;
}
.article-content blockquote{
  margin:28px 0;
  padding:18px 22px;
  border-left:3px solid var(--brand-500);
  border-radius:0 var(--r-m) var(--r-m) 0;
  background:rgba(255,255,255,.03);
  color:var(--text-2);
}
.article-content blockquote p{margin:0;font-size:16px;}
.article-content img{
  border-radius:var(--r-m);
  margin:24px 0;
  border:1px solid var(--line-1);
}
.article-content figcaption,
.article-content .caption{
  font-size:13px;
  color:var(--text-3);
  text-align:center;
  margin-top:-10px;
}
.article-content hr{
  border:0;
  border-top:1px solid var(--line-1);
  margin:40px 0;
}
.article-content .table-scroll{overflow-x:auto;margin:28px 0;}
.article-content table{
  width:100%;
  min-width:520px;
  border-collapse:separate;
  border-spacing:0;
  font-size:15px;
}
.article-content th{
  text-align:left;
  font-size:13px;
  font-weight:600;
  color:var(--brand-300);
  letter-spacing:.04em;
  padding:12px 16px;
  border-bottom:1px solid var(--line-brand);
  white-space:nowrap;
}
.article-content td{
  padding:14px 16px;
  border-bottom:1px solid var(--line-1);
  color:var(--text-2);
  vertical-align:top;
}
.article-content tr:hover td{background:rgba(255,255,255,.03);}
/* ============ 侧栏 ============ */
.side{
  position:sticky;
  top:96px;
  display:grid;
  gap:20px;
}
.glass{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line-1);
  box-shadow:var(--shadow-2),inset 0 1px 0 rgba(255,255,255,.12);
  border-radius:var(--r-l);
}
.side-card{padding:24px;}
.side-title{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  font-weight:600;
  color:var(--text-1);
  margin-bottom:16px;
}
.side-title svg{width:16px;height:16px;color:var(--brand-500);}
.toc-list{display:grid;gap:2px;}
.toc-list li a{
  display:block;
  padding:8px 10px 8px 14px;
  font-size:14px;
  line-height:1.6;
  color:var(--text-3);
  border-left:2px solid transparent;
  border-radius:0 8px 8px 0;
}
.toc-list li.toc-h3 a{padding-left:26px;font-size:13px;}
.toc-list li a:hover{
  color:var(--text-1);
  background:rgba(255,255,255,.04);
}
.toc-list li a.current{
  color:var(--brand-300);
  border-left-color:var(--brand-500);
  background:rgba(31,224,192,.08);
}
.hot-list{display:grid;gap:2px;}
.hot-list li a{
  display:flex;
  gap:12px;
  align-items:flex-start;
  padding:11px 10px;
  border-radius:var(--r-s);
  font-size:14px;
  line-height:1.6;
  color:var(--text-2);
}
.hot-list li a:hover{background:rgba(255,255,255,.04);color:var(--text-1);}
.hot-list .num{
  font-family:var(--font-num);
  font-size:12px;
  font-weight:700;
  color:var(--brand-500);
  flex:0 0 auto;
  margin-top:3px;
}
.side-cta{
  padding:24px;
  background:
    radial-gradient(120% 100% at 100% 0%,rgba(31,224,192,.16),transparent 60%),
    linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
}
.side-cta h3{
  font-size:18px;
  font-weight:600;
  color:var(--text-1);
  line-height:1.4;
  margin-bottom:10px;
}
.side-cta p{
  font-size:14px;
  line-height:1.8;
  color:var(--text-2);
  margin-bottom:18px;
}
.side-cta .btn{width:100%;}
/* ============ 文末标签与返回 ============ */
.article-tail{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  margin-top:48px;
  padding-top:28px;
  border-top:1px solid var(--line-1);
}
.tag-group{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;
  align-items:center;
  height:30px;
  padding:0 14px;
  border-radius:var(--pill);
  font-size:13px;
  color:var(--text-2);
  background:rgba(255,255,255,.04);
  border:1px solid var(--line-1);
  transition:border-color var(--t-color),color var(--t-color);
}
.tag:hover{border-color:var(--line-brand);color:var(--brand-300);}
/* ============ 相关推荐 ============ */
.related{padding:0 0 96px;}
.related-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:32px;
}
.related-head .more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  color:var(--text-2);
}
.related-head .more:hover{color:var(--brand-300);}
.related-head .more svg{width:14px;height:14px;}
.card-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.post-card{
  display:flex;
  flex-direction:column;
  border-radius:var(--r-l);
  overflow:hidden;
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid var(--line-1);
  box-shadow:var(--shadow-1);
  transition:transform var(--t-move),border-color var(--t-color),box-shadow var(--t-move);
}
.post-card:hover{
  transform:translateY(-2px);
  border-color:var(--line-brand);
  box-shadow:var(--shadow-2);
}
.post-thumb{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  background:var(--bg-2);
}
.post-thumb img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform 1.2s cubic-bezier(.22,.61,.36,1);
}
.post-card:hover .post-thumb img{transform:scale(1.04);}
.post-body{
  padding:20px 22px 22px;
  display:flex;
  flex-direction:column;
  gap:10px;
  flex:1;
}
.post-card h3{
  font-size:18px;
  font-weight:600;
  line-height:1.5;
  color:var(--text-1);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-card p{
  font-size:14px;
  line-height:1.7;
  color:var(--text-2);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-foot{
  margin-top:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-top:14px;
  border-top:1px solid var(--line-1);
  font-size:13px;
  color:var(--text-3);
}
.post-foot .arrow{
  width:16px;height:16px;
  color:var(--text-3);
  transition:transform var(--t-move),color var(--t-color);
}
.post-card:hover .post-foot .arrow{transform:translateX(4px);color:var(--brand-500);}
/* ============ CTA 横条 ============ */
.cta-strip{padding:0 0 96px;}
.cta-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  padding:36px 40px;
  border-radius:var(--r-xl);
  background:
    radial-gradient(120% 140% at 0% 0%,rgba(31,224,192,.14),transparent 55%),
    linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid var(--line-1);
  box-shadow:var(--shadow-2),inset 0 1px 0 rgba(255,255,255,.12);
}
.cta-inner h2{
  font-size:clamp(20px,2.4vw,26px);
  font-weight:700;
  color:var(--text-1);
  line-height:1.35;
}
.cta-inner p{
  margin-top:8px;
  font-size:14px;
  color:var(--text-2);
  max-width:52ch;
}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}
/* ============ 空态 ============ */
.empty-state{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:14px;
  min-height:240px;
  padding:40px 24px;
  text-align:center;
  border:1px dashed var(--line-1);
  border-radius:var(--r-l);
  background:rgba(255,255,255,.02);
}
.empty-state svg{width:32px;height:32px;color:var(--brand-500);opacity:.85;}
.empty-state p{font-size:15px;color:var(--text-2);}
/* ============ 页脚 ============ */
.site-footer{
  background:var(--bg-1);
  border-top:1px solid var(--line-1);
  padding:64px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-brand .logo{font-size:18px;}
.footer-brand p{
  margin-top:16px;
  font-size:14px;
  line-height:1.8;
  color:var(--text-2);
  max-width:30ch;
}
.footer-social{
  display:flex;
  gap:12px;
  margin-top:20px;
}
.footer-social a{
  width:38px;height:38px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:12px;
  border:1px solid var(--line-1);
  color:var(--text-2);
  background:rgba(255,255,255,.03);
}
.footer-social a svg{width:16px;height:16px;}
.footer-social a:hover{
  color:var(--brand-300);
  border-color:var(--line-brand);
  transform:translateY(-1px);
}
.footer-col h4{
  font-size:14px;
  font-weight:600;
  color:var(--text-1);
  margin-bottom:18px;
}
.footer-col ul{display:grid;gap:12px;}
.footer-col li a{
  position:relative;
  display:inline-block;
  padding-left:0;
  font-size:14px;
  color:var(--text-2);
  transition:color var(--t-color),padding-left var(--t-move);
}
.footer-col li a::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:3px;height:3px;
  border-radius:50%;
  background:var(--brand-500);
  transform:translateY(-50%) scale(0);
  transition:transform var(--t-move);
}
.footer-col li a:hover{color:var(--text-1);padding-left:12px;}
.footer-col li a:hover::before{transform:translateY(-50%) scale(1);}
.footer-info li{
  font-size:13px;
  color:var(--text-3);
  line-height:1.8;
}
.footer-info b{color:var(--text-2);font-weight:600;font-family:var(--font-num);}
.footer-bottom{
  border-top:1px solid var(--line-1);
  padding:20px 0 28px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.footer-bottom p{font-size:12px;color:var(--text-3);}
/* ============ 入场动画 ============ */
.reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity 620ms cubic-bezier(.22,.61,.36,1),transform 620ms cubic-bezier(.22,.61,.36,1);
}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;transition:none;}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important;}
}
/* ============ 响应式 ============ */
@media (max-width:1200px){
  .nav-links{gap:24px;}
  .article-layout{gap:36px;}
}
@media (max-width:992px){
  .nav-links{gap:18px;}
  .nav-link{font-size:14px;}
  .nav-link.active{padding:7px 13px;}
  .article-layout{
    grid-template-columns:1fr;
    gap:40px;
    padding:48px 0 64px;
  }
  .side{position:static;top:auto;}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;}
}
@media (max-width:900px){
  .nav-toggle{display:block;}
  .nav-entry{display:none;}
  .nav-links{
    position:fixed;
    inset:0;
    z-index:90;
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding:96px 24px 40px;
    background:rgba(5,7,15,.94);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    transform:translateX(100%);
    transition:transform var(--t-move);
    overflow-y:auto;
  }
  .nav-links.is-open{transform:translateX(0);}
  .nav-links .nav-link{
    width:100%;
    font-size:20px;
    line-height:64px;
    padding:0 0 0 16px;
    color:var(--text-1);
    border-bottom:1px solid var(--line-1);
    border-radius:0;
    background:transparent;
    border-left:3px solid transparent;
  }
  .nav-links .nav-link::after{display:none;}
  .nav-links .nav-link.active{
    border-left:3px solid var(--brand-500);
    background:rgba(31,224,192,.07);
    color:var(--brand-300);
  }
  .nav-inner{position:relative;z-index:100;}
  .nav-toggle{z-index:100;}
}
@media (max-width:768px){
  .container{padding:0 18px;}
  .page-main{padding-top:60px;}
  html.scrolled .page-main{padding-top:60px;}
  .site-header{height:60px;}
  html.scrolled .site-header{height:60px;}
  .crumbs{padding-top:22px;}
  .article-content{font-size:16px;line-height:1.9;}
  .article-content h2{font-size:23px;margin:40px 0 14px;}
  .article-content h3{font-size:19px;}
  .article-cover{aspect-ratio:16/9;border-radius:var(--r-m);}
  .related,.cta-strip{padding-bottom:64px;}
  .card-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px;}
  .cta-inner{padding:26px 22px;}
}
@media (max-width:520px){
  .article-head h1{font-size:26px;}
  .article-meta{gap:10px;}
  .article-tail{flex-direction:column;align-items:flex-start;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1 1 auto;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}

/* roulang page: category3 */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --bg-2:#101A2E;
  --brand-500:#1FE0C0;
  --brand-600:#12BFA3;
  --brand-300:#7CF3DF;
  --accent-500:#FF7A45;
  --accent-300:#FFB088;
  --data-3:#7C6BFF;
  --text-1:#F2F6FF;
  --text-2:#A9B6CE;
  --text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);
  --line-brand:rgba(31,224,192,.28);
  --success:#2FD48A;
  --warn:#F5B84A;
  --error:#FF5F6D;
  --r-s:10px;
  --r-m:16px;
  --r-l:22px;
  --r-xl:28px;
  --shadow-1:0 1px 2px rgba(0,0,0,.4);
  --shadow-2:0 12px 32px -12px rgba(0,0,0,.7);
  --font-cn:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --font-num:'Inter','JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --max:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-2);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(760px 420px at 12% -6%, rgba(31,224,192,.12), transparent 68%),
    radial-gradient(620px 380px at 96% 4%, rgba(255,122,69,.09), transparent 70%);
  z-index:0;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .18s var(--ease),border-color .18s var(--ease);}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;color:var(--text-1);font-weight:700;line-height:1.3;}
p{margin:0;}
button{font-family:inherit;font-size:inherit;}
a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--brand-500);
  outline-offset:2px;
  border-radius:var(--r-s);
}
::selection{background:rgba(31,224,192,.28);color:#fff;}

.container{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding:0 24px;
  position:relative;
  z-index:1;
}

/* ============ 导航 ============ */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:90;
  height:76px;
  background:rgba(5,7,15,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-1);
  transition:height .24s var(--ease),background .24s var(--ease);
}
.site-header.is-scrolled{height:64px;background:rgba(5,7,15,.92);}
.header-inner{display:flex;align-items:center;height:100%;gap:28px;}
.logo{
  display:inline-flex;align-items:center;gap:10px;
  font-size:18px;font-weight:700;color:var(--text-1);
  letter-spacing:-.01em;white-space:nowrap;
}
.logo svg{width:26px;height:26px;color:var(--brand-500);flex:none;}
.logo:hover{color:var(--brand-300);}
.nav-links{display:flex;align-items:center;gap:32px;margin-left:12px;}
.nav-link{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:8px 0;
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;left:50%;bottom:2px;
  width:0;height:2px;border-radius:2px;
  background:var(--brand-500);
  box-shadow:0 0 8px rgba(31,224,192,.85);
  transform:translateX(-50%);
  transition:width .18s var(--ease);
}
.nav-link:hover{color:var(--text-1);}
.nav-link:hover::after{width:16px;}
.nav-link.active{
  color:var(--brand-300);
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.3);
  border-radius:999px;
  padding:8px 14px;
}
.nav-link.active::after{display:none;}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:18px;}
.nav-ghost{font-size:15px;color:var(--text-2);}
.nav-ghost:hover{color:var(--brand-300);}
.nav-toggle{
  display:none;
  margin-left:auto;
  width:44px;height:44px;
  align-items:center;justify-content:center;
  background:transparent;
  border:1px solid var(--line-1);
  border-radius:12px;
  color:var(--text-1);
  cursor:pointer;
}
.nav-toggle span{
  display:block;width:18px;height:2px;border-radius:2px;
  background:currentColor;margin:3px auto;
}
.drawer{
  position:fixed;inset:0;z-index:95;
  background:rgba(5,7,15,.92);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  padding:88px 24px 40px;
  display:none;
  flex-direction:column;
  gap:4px;
}
.drawer.is-open{display:flex;}
.drawer a{
  font-size:20px;
  line-height:64px;
  color:var(--text-2);
  border-bottom:1px solid var(--line-1);
  padding-left:14px;
  position:relative;
}
.drawer a.active{color:var(--brand-300);}
.drawer a.active::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:3px;border-radius:3px;background:var(--brand-500);
}
.drawer-close{
  position:absolute;top:20px;right:24px;
  width:44px;height:44px;border-radius:12px;
  background:transparent;border:1px solid var(--line-1);color:var(--text-1);
  cursor:pointer;
}

/* ============ 通用组件 ============ */
.glass{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line-1);
  border-radius:var(--r-l);
  box-shadow:var(--shadow-1),var(--shadow-2),inset 0 1px 0 rgba(255,255,255,.12);
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;
  border-radius:999px;
  font-size:15px;font-weight:600;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .24s var(--ease),background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),box-shadow .24s var(--ease),filter .18s var(--ease);
  white-space:nowrap;
}
.btn svg{width:16px;height:16px;flex:none;}
.btn-primary{
  background:var(--brand-500);
  color:#05070F;
  box-shadow:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
}
.btn-primary:hover{
  filter:brightness(1.08);
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(31,224,192,.4),0 16px 38px -8px rgba(31,224,192,.5);
}
.btn-primary:active{transform:translateY(0);}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;filter:none;}
.btn-ghost{
  background:transparent;
  border-color:var(--line-1);
  color:var(--text-1);
}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand-300);transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(0);}
.btn-accent{
  background:var(--accent-500);
  color:#210D04;
  box-shadow:0 0 0 1px rgba(255,122,69,.3),0 10px 30px -8px rgba(255,122,69,.42);
}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px);}
.btn-sm{height:40px;padding:0 20px;font-size:14px;}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-num);
  font-size:12px;line-height:1;
  padding:7px 12px;
  border-radius:999px;
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.24);
  color:var(--brand-300);
  letter-spacing:.02em;
}
.badge-warn{
  background:rgba(255,122,69,.10);
  border-color:rgba(255,122,69,.26);
  color:var(--accent-300);
}

/* ============ Hero ============ */
.hero{
  position:relative;
  padding:calc(76px + 76px) 0 96px;
  overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-1.webp');
  background-size:cover;
  background-position:center;
  z-index:0;
}
.hero-bg::after{
  content:"";
  position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(5,7,15,.55),rgba(5,7,15,.92)),
    radial-gradient(700px 420px at 18% 12%, rgba(31,224,192,.16), transparent 70%);
}
.hero-grid{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:48px;
  align-items:center;
}
.eyebrow{
  font-size:12px;
  letter-spacing:.2em;
  color:var(--brand-500);
  font-family:var(--font-num);
  margin-bottom:18px;
  text-transform:uppercase;
}
.hero-title{
  font-size:clamp(30px,4.4vw,50px);
  line-height:1.14;
  font-weight:800;
  letter-spacing:-.02em;
  margin-bottom:22px;
}
.hero-title em{
  font-style:normal;
  background:linear-gradient(92deg,var(--brand-500),var(--brand-300));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-sub{
  font-size:16px;
  line-height:1.9;
  color:var(--text-2);
  max-width:56ch;
}
.hero-sub + .hero-sub{margin-top:10px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;}
.hero-stats{
  display:flex;flex-wrap:wrap;gap:12px 34px;
  margin-top:40px;
  padding-top:24px;
  border-top:1px solid var(--line-1);
}
.hero-stats .stat{
  display:inline-flex;align-items:center;gap:9px;
  font-size:13px;color:var(--text-3);
}
.hero-stats .stat svg{width:16px;height:16px;color:var(--brand-500);flex:none;}
.hero-stats .stat b{
  font-family:var(--font-num);
  color:var(--text-1);
  font-weight:700;
  letter-spacing:-.02em;
}

.panel{padding:24px;}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:16px;border-bottom:1px solid var(--line-1);}
.panel-label{font-size:13px;letter-spacing:.14em;color:var(--text-3);font-family:var(--font-num);text-transform:uppercase;}
.panel-list{margin-top:6px;}
.panel-list li{
  display:flex;align-items:center;gap:14px;
  padding:14px 0;
  border-bottom:1px solid var(--line-1);
  font-size:15px;color:var(--text-2);
}
.panel-list li:last-child{border-bottom:none;}
.panel-list .pn{
  font-family:var(--font-num);
  font-size:13px;
  color:var(--brand-500);
  width:26px;flex:none;
}
.panel-list em{
  margin-left:auto;
  font-style:normal;
  font-family:var(--font-num);
  font-size:13px;
  color:var(--text-3);
}
.panel-foot{
  display:flex;align-items:baseline;justify-content:space-between;
  margin-top:18px;padding-top:18px;border-top:1px solid var(--line-1);
  font-size:13px;color:var(--text-3);
}
.panel-foot b{
  font-family:var(--font-num);
  font-size:30px;font-weight:700;
  color:var(--brand-500);
  letter-spacing:-.02em;
}

/* ============ 板块 ============ */
.section{padding:96px 0;position:relative;}
.section-alt{background:var(--bg-1);border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1);}
.section-head{max-width:720px;margin-bottom:48px;}
.section-head h2{
  font-size:clamp(26px,3.2vw,38px);
  line-height:1.25;
  letter-spacing:-.01em;
}
.section-head h2::after{
  content:"";
  display:block;width:48px;height:3px;border-radius:3px;
  margin-top:18px;
  background:linear-gradient(90deg,var(--brand-500),rgba(31,224,192,0));
}
.section-lead{margin-top:16px;font-size:16px;color:var(--text-2);max-width:62ch;}

/* ============ 数据条 ============ */
.bar-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px 40px;
}
.bar-item{padding:20px 0;border-bottom:1px solid var(--line-1);}
.bar-top{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:14px;}
.bar-top span{font-size:15px;color:var(--text-2);}
.bar-top b{
  font-family:var(--font-num);
  font-size:20px;font-weight:700;
  color:var(--text-1);
  letter-spacing:-.02em;
}
.bar-track{
  height:6px;
  border-radius:999px;
  background:rgba(255,255,255,.06);
  overflow:hidden;
}
.bar-fill{
  display:block;height:100%;width:0;
  border-radius:999px;
  background:linear-gradient(90deg,var(--brand-500),var(--brand-600));
  box-shadow:0 0 14px rgba(31,224,192,.45);
  transition:width .9s var(--ease);
}
.bar-fill.alt{
  background:linear-gradient(90deg,var(--accent-500),var(--accent-300));
  box-shadow:0 0 14px rgba(255,122,69,.4);
}
.bar-item.is-visible .bar-fill{width:var(--w);}

/* ============ 时间线 ============ */
.timeline{position:relative;padding-left:0;}
.timeline::before{
  content:"";
  position:absolute;
  left:15px;top:14px;bottom:14px;
  width:2px;
  border-radius:2px;
  background:linear-gradient(180deg,var(--brand-500),rgba(31,224,192,.25) 62%,rgba(31,224,192,.04));
}
.tl-item{position:relative;padding-left:58px;}
.tl-item + .tl-item{margin-top:24px;}
.tl-dot{
  position:absolute;
  left:8px;top:30px;
  width:16px;height:16px;
  border-radius:50%;
  background:var(--bg-0);
  border:2px solid var(--brand-500);
  box-shadow:0 0 0 5px rgba(31,224,192,.10);
}
.tl-card{padding:26px 28px;}
.tl-head{
  display:flex;align-items:center;flex-wrap:wrap;gap:14px;
  margin-bottom:14px;
}
.tl-index{
  font-family:var(--font-num);
  font-size:22px;font-weight:700;
  color:var(--brand-500);
  letter-spacing:-.02em;
}
.tl-head h3{font-size:20px;line-height:1.4;}
.tl-head .badge{margin-left:auto;}
.tl-card > p{font-size:15px;color:var(--text-2);max-width:74ch;}
.tl-list{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px 24px;
  margin-top:20px;
  padding-top:20px;
  border-top:1px solid var(--line-1);
}
.tl-list li{
  display:flex;gap:9px;
  font-size:14px;line-height:1.75;
  color:var(--text-2);
}
.tl-list li svg{width:16px;height:16px;color:var(--brand-500);flex:none;margin-top:5px;}

/* ============ 提示与自查 ============ */
.notes-grid{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:32px;
  align-items:start;
}
.note-card{padding:28px;}
.note-card h3{font-size:20px;margin-bottom:14px;}
.note-card > p{font-size:15px;color:var(--text-2);}
.note-figure{
  margin:22px 0 0;
  aspect-ratio:16/9;
  border-radius:var(--r-m);
  overflow:hidden;
  background:var(--bg-2);
}
.note-figure img{width:100%;height:100%;object-fit:cover;}
.note-side{display:grid;gap:16px;}
.note-item{
  padding:20px 22px;
  border-radius:var(--r-m);
  border:1px solid var(--line-1);
  background:rgba(255,255,255,.02);
  transition:border-color .18s var(--ease),transform .24s var(--ease),background .18s var(--ease);
}
.note-item:hover{border-color:var(--line-brand);transform:translateY(-2px);background:rgba(255,255,255,.035);}
.note-item h4{
  display:flex;align-items:center;gap:10px;
  font-size:16px;margin-bottom:8px;
}
.note-item h4 svg{width:18px;height:18px;color:var(--accent-500);flex:none;}
.note-item p{font-size:14px;line-height:1.8;color:var(--text-2);}

.checklist{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:0 40px;
  border-top:1px solid var(--line-1);
}
.checklist li{
  display:flex;align-items:flex-start;gap:14px;
  padding:22px 0;
  border-bottom:1px solid var(--line-1);
  font-size:15px;
  color:var(--text-1);
}
.checklist .ck-no{
  font-family:var(--font-num);
  font-size:13px;
  color:var(--brand-500);
  width:34px;flex:none;
  padding-top:4px;
}
.checklist span.ck-text{color:var(--text-2);}
.checklist span.ck-text b{color:var(--text-1);font-weight:600;}

/* ============ CTA ============ */
.cta-band{
  padding:40px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  flex-wrap:wrap;
}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);line-height:1.3;}
.cta-band p{margin-top:12px;font-size:15px;color:var(--text-2);max-width:56ch;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--bg-1);
  border-top:1px solid var(--line-1);
  padding:64px 0 0;
  margin-top:96px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-brand .logo{margin-bottom:16px;}
.footer-brand p{font-size:14px;color:var(--text-2);max-width:30ch;}
.footer-social{display:flex;gap:12px;margin-top:20px;}
.footer-social a{
  width:38px;height:38px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:12px;
  border:1px solid var(--line-1);
  color:var(--text-3);
  transition:color .18s var(--ease),border-color .18s var(--ease),transform .24s var(--ease);
}
.footer-social a svg{width:18px;height:18px;}
.footer-social a:hover{color:var(--brand-300);border-color:var(--line-brand);transform:translateY(-2px);}
.footer-col h4{
  font-size:14px;
  letter-spacing:.06em;
  color:var(--text-1);
  margin-bottom:18px;
}
.footer-col ul li{margin-bottom:12px;}
.footer-col ul a{
  position:relative;
  font-size:14px;
  color:var(--text-2);
  padding-left:0;
  transition:color .18s var(--ease),padding-left .22s var(--ease);
}
.footer-col ul a::before{
  content:"";
  position:absolute;left:0;top:50%;
  width:3px;height:3px;border-radius:50%;
  background:var(--brand-500);
  transform:translateY(-50%) scale(0);
  transition:transform .22s var(--ease);
}
.footer-col ul a:hover{color:var(--text-1);padding-left:12px;}
.footer-col ul a:hover::before{transform:translateY(-50%) scale(1);}
.footer-info li{font-size:14px;color:var(--text-3);}
.footer-info b{font-family:var(--font-num);color:var(--text-1);font-weight:600;}
.footer-bottom{
  border-top:1px solid var(--line-1);
  padding:22px 0 28px;
  display:flex;flex-wrap:wrap;gap:10px 24px;
  align-items:center;justify-content:space-between;
}
.footer-bottom p{font-size:13px;color:var(--text-3);}
.footer-note{font-size:12px;color:var(--text-3);}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease);}
.reveal.is-visible{opacity:1;transform:none;}

/* ============ 响应式 ============ */
@media (max-width:1200px){
  .nav-links{gap:24px;}
  .nav-ghost{display:none;}
}
@media (max-width:992px){
  .hero{padding:calc(76px + 56px) 0 64px;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .section{padding:64px 0;}
  .notes-grid{grid-template-columns:1fr;}
  .tl-list{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:900px){
  .nav-links{display:none;}
  .nav-toggle{display:inline-flex;}
  .nav-actions{display:none;}
}
@media (max-width:768px){
  .container{padding:0 18px;}
  .section{padding:56px 0;}
  .section-head{margin-bottom:32px;}
  .bar-grid{grid-template-columns:1fr;gap:8px;}
  .tl-list{grid-template-columns:1fr;}
  .tl-item{padding-left:42px;}
  .tl-card{padding:22px 18px;}
  .timeline::before{left:11px;}
  .tl-dot{left:4px;width:14px;height:14px;top:26px;}
  .checklist{grid-template-columns:1fr;}
  .cta-band{padding:28px 20px;}
  .site-footer{margin-top:64px;}
}
@media (max-width:520px){
  body{font-size:15px;}
  .hero-title{font-size:clamp(26px,7.4vw,34px);}
  .hero-sub{font-size:15px;}
  .hero-stats{gap:12px 20px;}
  .section{padding:48px 0;}
  .panel{padding:20px 18px;}
  .note-card{padding:22px 18px;}
  .footer-grid{grid-template-columns:1fr;}
  .btn{height:44px;padding:0 20px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category2 */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --bg-2:#101A2E;
  --brand-500:#1FE0C0;
  --brand-600:#12BFA3;
  --brand-300:#7CF3DF;
  --accent-500:#FF7A45;
  --accent-300:#FFB088;
  --data-3:#7C6BFF;
  --text-1:#F2F6FF;
  --text-2:#A9B6CE;
  --text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);
  --line-brand:rgba(31,224,192,.28);
  --ok:#2FD48A;
  --warn:#F5B84A;
  --err:#FF5F6D;
  --r-s:10px;
  --r-m:16px;
  --r-l:22px;
  --r-xl:28px;
  --sh-1:0 1px 2px rgba(0,0,0,.4);
  --sh-2:0 12px 32px -12px rgba(0,0,0,.7);
  --font-cn:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --font-num:'Inter','JetBrains Mono',monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-2);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px}
::selection{background:rgba(31,224,192,.28);color:#fff}

.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}

/* ============ 顶栏 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  background:rgba(5,7,15,.72);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-1);
  transition:background .24s var(--ease),height .24s var(--ease);
}
.site-header.is-scrolled{background:rgba(5,7,15,.92);box-shadow:var(--sh-1)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:76px;transition:height .24s var(--ease)}
.site-header.is-scrolled .header-inner{height:64px}

.logo{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-1);letter-spacing:-.01em}
.logo svg{width:28px;height:28px;color:var(--brand-500);flex:none}

.nav-links{display:flex;align-items:center;gap:32px}
.nav-link{
  position:relative;font-size:15px;color:var(--text-2);padding:6px 2px;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:-2px;width:16px;height:2px;border-radius:2px;
  background:var(--brand-500);transform:translateX(-50%) scaleX(0);transform-origin:center;
  transition:transform .24s var(--ease);box-shadow:0 0 8px rgba(31,224,192,.7);
}
.nav-link:hover{color:var(--text-1)}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{
  color:var(--brand-300);
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.30);
  border-radius:999px;
  padding:8px 16px;
}
.nav-link.active::after{display:none}

.header-actions{display:flex;align-items:center;gap:20px}
.link-sub{font-size:15px;color:var(--text-2);transition:color .18s var(--ease)}
.link-sub:hover{color:var(--brand-300)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),filter .18s var(--ease);
  white-space:nowrap;
}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn-primary{
  background:var(--brand-500);color:var(--bg-0);
  box-shadow:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.45),0 14px 36px -8px rgba(31,224,192,.55)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;border:1px solid var(--line-1);color:var(--text-1)}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand-300)}
.btn-accent{
  background:var(--accent-500);color:#160A04;
  box-shadow:0 0 0 1px rgba(255,122,69,.35),0 10px 30px -8px rgba(255,122,69,.45);
}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}

.nav-toggle{
  display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line-1);
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--text-1);transition:transform .24s var(--ease),opacity .18s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-drawer{
  position:fixed;inset:0;background:rgba(5,7,15,.94);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  padding:96px 24px 40px;display:none;flex-direction:column;gap:4px;z-index:70;
}
.mobile-drawer.is-open{display:flex}
.mobile-drawer a{
  font-size:20px;line-height:64px;color:var(--text-2);padding-left:16px;
  border-bottom:1px solid var(--line-1);position:relative;
}
.mobile-drawer a.active{color:var(--brand-300)}
.mobile-drawer a.active::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:3px;border-radius:3px;background:var(--brand-500);
}

/* ============ 通用区块 ============ */
main{padding-top:76px}
.section{padding:96px 0}
.section--alt{background:var(--bg-1);border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1)}
.eyebrow{
  display:inline-block;font-size:12px;letter-spacing:.2em;color:var(--brand-500);
  font-family:var(--font-num);text-transform:uppercase;margin-bottom:14px;
}
h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25;font-weight:700;color:var(--text-1);letter-spacing:-.01em}
h3{font-size:20px;line-height:1.4;font-weight:600;color:var(--text-1)}
.section-head{max-width:760px;margin-bottom:44px}
.section-head p{margin-top:14px;font-size:16px;color:var(--text-2);max-width:64ch}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums}

/* ============ 内页横幅 ============ */
.page-banner{
  position:relative;overflow:hidden;
  background-image:linear-gradient(180deg,rgba(5,7,15,.55),rgba(5,7,15,.94)),url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  border-bottom:1px solid var(--line-1);
}
.page-banner::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:24px 24px;opacity:.4;pointer-events:none;
}
.banner-inner{position:relative;z-index:2;padding:56px 0 64px}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;font-size:12px;color:var(--text-3);margin-bottom:26px}
.breadcrumb a{color:var(--text-3);transition:color .18s var(--ease)}
.breadcrumb a:hover{color:var(--brand-300)}
.breadcrumb .sep{color:var(--text-3);opacity:.6}
.breadcrumb .current{color:var(--text-2)}
.page-banner h1{
  font-size:clamp(30px,4.4vw,50px);line-height:1.15;font-weight:800;color:var(--text-1);
  letter-spacing:-.015em;max-width:20ch;
}
.banner-lead{margin-top:20px;max-width:62ch;font-size:16px;color:var(--text-2)}
.banner-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;border-radius:999px;
  font-size:12px;color:var(--brand-300);background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.22);
}
.tag--muted{color:var(--text-3);background:rgba(255,255,255,.04);border-color:var(--line-1)}

/* ============ 玻璃卡 ============ */
.glass{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line-1);
  border-radius:var(--r-l);
  box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.12);
}

/* ============ 对照区 ============ */
.compare-wrap{
  display:grid;grid-template-columns:1fr 1px 1fr;gap:0;
  border-radius:var(--r-xl);overflow:hidden;
  border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
}
.compare-col{padding:34px 30px}
.compare-divider{background:linear-gradient(180deg,transparent,rgba(31,224,192,.5),transparent);box-shadow:0 0 18px rgba(31,224,192,.45)}
.compare-col header{display:flex;align-items:center;gap:10px;padding-bottom:18px;border-bottom:1px solid var(--line-1);margin-bottom:6px}
.compare-col header .dot{width:9px;height:9px;border-radius:50%;flex:none}
.compare-col--muted header .dot{background:var(--text-3)}
.compare-col--active header .dot{background:var(--brand-500);box-shadow:0 0 10px rgba(31,224,192,.8)}
.compare-col header h3{font-size:17px;font-weight:600}
.compare-col--muted header h3{color:var(--text-3)}
.compare-col--active header h3{color:var(--text-1)}

.compare-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:16px 0;border-bottom:1px solid var(--line-1);
  font-size:15px;line-height:1.75;
}
.compare-list li:last-child{border-bottom:0;padding-bottom:0}
.compare-list .mark{flex:none;width:20px;height:20px;margin-top:4px;display:flex;align-items:center;justify-content:center}
.compare-col--muted .compare-list li{color:var(--text-3)}
.compare-col--muted .mark::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--text-3);opacity:.65}
.compare-col--active .compare-list li{color:var(--text-1)}
.compare-col--active .mark svg{width:18px;height:18px;color:var(--brand-500)}

/* ============ 数据条 ============ */
.bars{display:grid;gap:26px;margin-top:8px}
.bar-item{display:grid;grid-template-columns:220px 1fr 96px;align-items:center;gap:20px}
.bar-label{font-size:15px;color:var(--text-2)}
.bar-track{height:8px;border-radius:999px;background:rgba(255,255,255,.06);overflow:hidden;position:relative}
.bar-fill{
  height:100%;width:0;border-radius:999px;
  transition:width .6s var(--ease);
}
.bar-fill--brand{background:linear-gradient(90deg,var(--brand-600),var(--brand-500))}
.bar-fill--accent{background:linear-gradient(90deg,#E05A2C,var(--accent-500))}
.bar-value{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-size:20px;font-weight:700;color:var(--text-1);text-align:right;letter-spacing:-.02em}
.bars-note{margin-top:30px;font-size:13px;color:var(--text-3);line-height:1.7}

/* ============ 图文卡 ============ */
.feature{
  display:grid;grid-template-columns:6fr 6fr;gap:0;overflow:hidden;
  border-radius:var(--r-xl);border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
}
.feature-media{position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--bg-2)}
.feature-media img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.feature:hover .feature-media img{transform:scale(1.04)}
.feature-media .float-tag{
  position:absolute;left:18px;bottom:18px;z-index:2;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:999px;font-size:12px;color:var(--brand-300);
  background:rgba(5,7,15,.66);border:1px solid var(--line-brand);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.feature-body{padding:40px 36px;display:flex;flex-direction:column;justify-content:center;gap:16px}
.feature-body h3{font-size:22px}
.feature-body p{font-size:15px;line-height:1.9;color:var(--text-2)}
.feature-points{display:grid;gap:12px;margin-top:6px}
.feature-points li{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--text-2)}
.feature-points svg{width:16px;height:16px;flex:none;margin-top:6px;color:var(--brand-500)}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line-1)}
.faq-item{border-bottom:1px solid var(--line-1)}
.faq-q{
  width:100%;display:flex;align-items:center;gap:18px;text-align:left;
  padding:22px 0;min-height:68px;
}
.faq-q .plus{
  flex:none;width:24px;height:24px;border-radius:50%;border:1px solid var(--brand-500);
  display:flex;align-items:center;justify-content:center;color:var(--brand-500);
  transition:transform .24s var(--ease),background .18s var(--ease),color .18s var(--ease);
}
.faq-q .plus svg{width:12px;height:12px}
.faq-q span{font-size:17px;font-weight:600;color:var(--text-1);line-height:1.6}
.faq-item.is-open .faq-q .plus{transform:rotate(45deg);background:var(--brand-500);color:var(--bg-0)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .32s var(--ease);
}
.faq-a-inner{
  padding:0 0 22px 42px;max-width:72ch;font-size:16px;line-height:1.9;color:var(--text-2);
}
.faq-item.is-open .faq-a{max-height:420px}

/* ============ 表单 ============ */
.contact-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start}
.contact-intro h2{margin-bottom:16px}
.contact-intro > p{font-size:16px;color:var(--text-2);max-width:46ch}
.contact-points{display:grid;gap:16px;margin-top:28px}
.contact-points li{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:var(--text-2)}
.contact-points .ico{
  flex:none;width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:rgba(31,224,192,.10);border:1px solid rgba(31,224,192,.28);color:var(--brand-500);
}
.contact-points .ico svg{width:16px;height:16px}
.contact-meta{margin-top:30px;padding-top:22px;border-top:1px solid var(--line-1);font-size:14px;color:var(--text-3);display:grid;gap:8px}
.contact-meta b{color:var(--text-1);font-family:var(--font-num);font-weight:600}

.form-card{
  border-radius:var(--r-xl);padding:34px;
  background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line-1);
  box-shadow:var(--sh-2),inset 0 1px 0 rgba(255,255,255,.12);
}
.form-row{display:grid;gap:8px;margin-bottom:20px}
.form-row label{font-size:14px;color:var(--text-2)}
.form-row label .req{color:var(--accent-500);margin-left:4px}
.field{
  width:100%;height:48px;padding:0 16px;border-radius:12px;
  background:rgba(255,255,255,.04);border:1px solid var(--line-1);
  color:var(--text-1);font-size:15px;
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease);
}
textarea.field{height:auto;min-height:120px;padding:14px 16px;line-height:1.8;resize:vertical}
select.field{
  appearance:none;-webkit-appearance:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23A9B6CE' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat:no-repeat;background-position:right 16px center;
  padding-right:44px;
}
.field::placeholder{color:var(--text-3)}
.field:focus{outline:none;border-color:var(--brand-500);box-shadow:0 0 0 3px rgba(31,224,192,.18);background:rgba(255,255,255,.06)}
.field.has-error{border-color:var(--err);box-shadow:0 0 0 3px rgba(255,95,109,.16)}
.field-error{font-size:14px;color:var(--err);display:none}
.field-error.is-visible{display:block}

.check-row{display:flex;align-items:flex-start;gap:12px;margin:6px 0 24px}
.check-box{
  position:relative;flex:none;width:18px;height:18px;margin-top:6px;border-radius:5px;
  border:1px solid var(--line-1);background:rgba(255,255,255,.04);cursor:pointer;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.check-box svg{position:absolute;inset:0;margin:auto;width:12px;height:12px;color:var(--bg-0);opacity:0;transition:opacity .18s var(--ease)}
input[type="checkbox"]:checked + .check-box{background:var(--brand-500);border-color:var(--brand-500)}
input[type="checkbox"]:checked + .check-box svg{opacity:1}
.check-row input[type="checkbox"]{position:absolute;opacity:0;pointer-events:none}
.check-row label{font-size:14px;line-height:1.7;color:var(--text-2);cursor:pointer}
.form-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.form-hint{font-size:13px;color:var(--text-3)}
.form-status{display:none;margin-top:18px;font-size:14px;color:var(--ok)}
.form-status.is-visible{display:block}

/* ============ 相关分类 ============ */
.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.related-card{
  display:flex;flex-direction:column;gap:10px;padding:22px;
  border-radius:var(--r-m);border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  transition:transform .24s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.related-card:hover{transform:translateY(-2px);border-color:var(--line-brand);background:rgba(255,255,255,.05)}
.related-card .arrow{color:var(--brand-500);transition:transform .24s var(--ease)}
.related-card:hover .arrow{transform:translateX(4px)}
.related-card h3{font-size:16px}
.related-card p{font-size:13px;color:var(--text-3);line-height:1.7}

/* ============ 页脚 ============ */
.site-footer{background:var(--bg-1);border-top:1px solid var(--line-1);padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand p{margin-top:16px;font-size:14px;color:var(--text-3);max-width:30ch;line-height:1.8}
.footer-social{display:flex;gap:12px;margin-top:22px}
.footer-social a{
  width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line-1);color:var(--text-3);
  transition:color .18s var(--ease),border-color .18s var(--ease),transform .24s var(--ease);
}
.footer-social a:hover{color:var(--brand-300);border-color:var(--line-brand);transform:translateY(-2px)}
.footer-social svg{width:16px;height:16px}
.footer-col h4{font-size:15px;font-weight:600;color:var(--text-1);margin-bottom:18px}
.footer-col ul{display:grid;gap:12px}
.footer-col a{
  position:relative;display:inline-block;font-size:14px;color:var(--text-3);padding-left:0;
  transition:color .18s var(--ease),padding-left .24s var(--ease);
}
.footer-col a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scale(0);
  width:3px;height:3px;border-radius:50%;background:var(--brand-500);
  transition:transform .24s var(--ease);
}
.footer-col a:hover{color:var(--text-1);padding-left:12px}
.footer-col a:hover::before{transform:translateY(-50%) scale(1)}
.footer-info li{font-size:14px;color:var(--text-3);line-height:1.9}
.footer-info b{color:var(--text-2);font-family:var(--font-num);font-weight:600}
.footer-bottom{
  margin-top:52px;padding:22px 0;border-top:1px solid var(--line-1);
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  font-size:12px;color:var(--text-3);
}
.footer-bottom .legal{max-width:70ch;line-height:1.7}

/* ============ 入场动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:1200px){
  .bar-item{grid-template-columns:180px 1fr 88px;gap:16px}
}
@media (max-width:992px){
  .section{padding:64px 0}
  .compare-wrap{grid-template-columns:1fr;border-radius:var(--r-l)}
  .compare-divider{display:none}
  .compare-col--muted{border-bottom:1px solid var(--line-1)}
  .feature{grid-template-columns:1fr}
  .feature-media{order:2;aspect-ratio:16/9}
  .contact-grid{grid-template-columns:1fr;gap:36px}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:900px){
  .nav-links{display:none}
  .link-sub{display:none}
  .nav-toggle{display:flex}
  .header-actions{gap:12px}
}
@media (max-width:768px){
  .container{padding:0 18px}
  main{padding-top:60px}
  .header-inner{height:60px}
  .site-header.is-scrolled .header-inner{height:60px}
  .banner-inner{padding:40px 0 48px}
  .bar-item{grid-template-columns:1fr auto;gap:10px}
  .bar-label{grid-column:1 / -1}
  .bar-track{grid-column:1 / 2}
  .bar-value{grid-column:2 / 3;font-size:18px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  .section{padding:48px 0}
  .compare-col{padding:24px 18px}
  .feature-body{padding:26px 20px}
  .form-card{padding:22px 18px}
  .related-grid{grid-template-columns:1fr}
  h2{font-size:24px}
  .faq-q span{font-size:16px}
  .faq-a-inner{padding-left:0}
  .btn{height:44px;padding:0 20px;font-size:14px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category4 */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --bg-2:#101A2E;
  --brand-500:#1FE0C0;
  --brand-600:#12BFA3;
  --brand-300:#7CF3DF;
  --accent-500:#FF7A45;
  --accent-300:#FFB088;
  --data-3:#7C6BFF;
  --text-1:#F2F6FF;
  --text-2:#A9B6CE;
  --text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);
  --line-brand:rgba(31,224,192,.28);
  --ok:#2FD48A;
  --warn:#F5B84A;
  --err:#FF5F6D;
  --r-s:10px;
  --r-m:16px;
  --r-l:22px;
  --r-xl:28px;
  --shadow-1:0 1px 2px rgba(0,0,0,.4);
  --shadow-2:0 12px 32px -12px rgba(0,0,0,.7);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-cn:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --font-num:'Inter','JetBrains Mono',ui-monospace,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-2);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
h1,h2,h3,h4{margin:0;color:var(--text-1);line-height:1.3;font-weight:700;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px;}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-feature-settings:"tnum";}

.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px;}
.section{padding:96px 0;}
.section--alt{background:var(--bg-1);border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1);}
.eyebrow{
  font-family:var(--font-num);
  font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--brand-500);margin-bottom:16px;display:block;
}
.section-head{max-width:760px;margin-bottom:48px;}
.section-head h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25;font-weight:700;}
.section-head p{margin-top:14px;font-size:16px;color:var(--text-2);}

/* ---------- 导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  height:76px;display:flex;align-items:center;
  background:rgba(5,7,15,.72);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line-1);
  transition:height 240ms var(--ease),background-color 240ms var(--ease);
}
.site-header.is-scrolled{height:64px;background:rgba(5,7,15,.92);}
.header-inner{
  width:100%;max-width:1240px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-1);letter-spacing:-.01em;}
.logo svg{width:28px;height:28px;color:var(--brand-500);flex:0 0 auto;}
.nav-links{display:flex;align-items:center;gap:32px;}
.nav-link{
  position:relative;font-size:15px;color:var(--text-2);
  padding:8px 2px;transition:color 180ms var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:0;width:0;height:2px;
  background:var(--brand-500);border-radius:2px;
  box-shadow:0 0 8px rgba(31,224,192,.7);
  transform:translateX(-50%);
  transition:width 240ms var(--ease);
}
.nav-link:hover{color:var(--text-1);}
.nav-link:hover::after{width:16px;}
.nav-link.active{
  color:var(--brand-300);
  background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.3);
  padding:8px 16px;border-radius:999px;
}
.nav-link.active::after{display:none;}
.header-actions{display:flex;align-items:center;gap:18px;}
.link-quiet{font-size:15px;color:var(--text-2);transition:color 180ms var(--ease);}
.link-quiet:hover{color:var(--brand-300);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:999px;
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:transform 240ms var(--ease),box-shadow 240ms var(--ease),background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
  white-space:nowrap;
}
.btn-primary{
  background:var(--brand-500);color:var(--bg-0);
  box-shadow:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.45),0 14px 36px -8px rgba(31,224,192,.55);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:transparent;border-color:var(--line-1);color:var(--text-1);}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand-300);transform:translateY(-1px);}
.btn-accent{background:var(--accent-500);color:#1A0A03;box-shadow:0 0 0 1px rgba(255,122,69,.35),0 10px 30px -8px rgba(255,122,69,.45);}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px);}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:12px;
  background:transparent;border:1px solid var(--line-1);cursor:pointer;
  align-items:center;justify-content:center;
}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text-1);border-radius:2px;position:relative;}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:var(--text-1);border-radius:2px;
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;padding:168px 0 84px;overflow:hidden;
  background:
    linear-gradient(180deg,rgba(5,7,15,.55),rgba(5,7,15,.92)),
    url('/assets/images/backpic/back-3.png') center/cover no-repeat,
    var(--bg-0);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:24px 24px;opacity:.04;
}
.hero::after{
  content:"";position:absolute;right:-160px;top:-120px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(31,224,192,.22),transparent 65%);pointer-events:none;
}
.hero-inner{position:relative;z-index:2;max-width:840px;}
.hero h1{
  font-size:clamp(34px,5.2vw,56px);line-height:1.12;font-weight:800;letter-spacing:-.02em;
}
.hero-lead{margin-top:20px;font-size:17px;line-height:1.9;color:var(--text-2);max-width:66ch;}
.hero-actions{margin-top:32px;display:flex;flex-wrap:wrap;gap:14px;}
.hero-badges{margin-top:36px;display:flex;flex-wrap:wrap;gap:12px;}
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border-radius:999px;font-size:13px;
  border:1px solid var(--line-1);background:rgba(255,255,255,.03);color:var(--text-2);
}
.badge svg{width:15px;height:15px;color:var(--brand-500);}
.badge--accent{border-color:rgba(255,122,69,.35);color:var(--accent-300);}
.badge--accent svg{color:var(--accent-500);}

/* ---------- 数据带 ---------- */
.stat-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
  margin-top:-40px;position:relative;z-index:5;
}
.stat-item{
  padding:24px;
  border-radius:var(--r-m);
  border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow-1),inset 0 1px 0 rgba(255,255,255,.12);
  transition:transform 240ms var(--ease),border-color 180ms var(--ease);
}
.stat-item:hover{transform:translateY(-2px);border-color:var(--line-brand);}
.stat-icon{
  width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(31,224,192,.10);border:1px solid rgba(31,224,192,.24);color:var(--brand-500);
  margin-bottom:16px;
}
.stat-icon svg{width:20px;height:20px;}
.stat-value{font-family:var(--font-num);font-size:34px;font-weight:700;letter-spacing:-.02em;color:var(--text-1);line-height:1.1;}
.stat-value small{font-size:14px;font-weight:600;color:var(--text-2);margin-left:6px;letter-spacing:0;}
.stat-line{height:1px;background:var(--line-1);margin:16px 0 12px;}
.stat-note{font-size:13px;line-height:1.6;color:var(--text-3);}
.stat-bar{width:64px;height:2px;border-radius:2px;margin-top:14px;background:linear-gradient(90deg,var(--brand-500),var(--accent-500));}

/* ---------- Bento 栅格 ---------- */
.bento{display:grid;grid-template-columns:repeat(12,1fr);gap:20px;}
.bento-card{
  position:relative;display:flex;flex-direction:column;
  padding:28px;border-radius:var(--r-l);
  border:1px solid var(--line-1);
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow-1),inset 0 1px 0 rgba(255,255,255,.12);
  transition:transform 240ms var(--ease),border-color 180ms var(--ease),box-shadow 240ms var(--ease);
}
.bento-card:hover{transform:translateY(-3px);border-color:var(--line-brand);box-shadow:var(--shadow-2);}
.bento-card .card-icon{
  width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:rgba(31,224,192,.10);border:1px solid rgba(31,224,192,.24);color:var(--brand-500);
  margin-bottom:18px;
}
.bento-card .card-icon svg{width:24px;height:24px;}
.bento-card h3{font-size:21px;font-weight:600;line-height:1.4;}
.bento-card p{margin-top:12px;font-size:15px;line-height:1.85;color:var(--text-2);}
.bento-card .card-foot{
  margin-top:auto;padding-top:22px;display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:var(--brand-300);
}
.bento-card .card-foot svg{width:16px;height:16px;transition:transform 240ms var(--ease);}
.bento-card:hover .card-foot svg{transform:translateX(4px);}
.bento-card--wide{grid-column:span 6;}
.bento-card--s{grid-column:span 3;}
.bento-card--m{grid-column:span 4;}
.bento-card--media{padding:0;overflow:hidden;}
.bento-card--media .media-box{position:relative;aspect-ratio:16/9;background:var(--bg-2);overflow:hidden;}
.bento-card--media .media-box img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease);}
.bento-card--media:hover .media-box img{transform:scale(1.04);}
.bento-card--media .media-body{padding:24px 28px 28px;}
.bento-card--media .media-tag{
  position:absolute;left:16px;bottom:16px;
  padding:6px 12px;border-radius:999px;font-size:12px;color:var(--brand-300);
  background:rgba(5,7,15,.72);border:1px solid var(--line-brand);
  backdrop-filter:blur(8px);
}
.check-list{margin-top:16px;border-top:1px solid var(--line-1);}
.check-list li{
  display:flex;align-items:flex-start;gap:10px;
  padding:12px 0;border-bottom:1px solid var(--line-1);
  font-size:14px;line-height:1.7;color:var(--text-2);
}
.check-list li:last-child{border-bottom:none;}
.check-list svg{width:16px;height:16px;flex:0 0 auto;margin-top:5px;color:var(--brand-500);}

/* ---------- 双栏要点 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.split-media{position:relative;border-radius:var(--r-l);overflow:hidden;background:var(--bg-2);aspect-ratio:4/3;}
.split-media img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease);}
.split-media:hover img{transform:scale(1.04);}
.split-media .glass-tag{
  position:absolute;left:18px;bottom:18px;
  padding:8px 14px;border-radius:999px;font-size:13px;color:var(--text-1);
  background:rgba(5,7,15,.7);border:1px solid var(--line-1);backdrop-filter:blur(10px);
}
.diff-list{border-top:1px solid var(--line-1);margin-top:28px;}
.diff-list li{
  display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line-1);
  transition:background-color 180ms var(--ease);
}
.diff-list li:hover{background:rgba(255,255,255,.03);}
.diff-list .idx{
  font-family:var(--font-num);font-size:15px;font-weight:700;color:var(--brand-500);
  width:36px;flex:0 0 auto;padding-top:3px;
}
.diff-list h3{font-size:17px;font-weight:600;color:var(--text-1);}
.diff-list p{margin-top:6px;font-size:15px;line-height:1.8;color:var(--text-2);}

/* ---------- 底部 CTA 横条 ---------- */
.cta-bar{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px;
  padding:36px 40px;border-radius:var(--r-xl);
  border:1px solid var(--line-1);
  background:linear-gradient(120deg,rgba(31,224,192,.10),rgba(255,122,69,.08) 70%,rgba(255,255,255,.02));
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  box-shadow:var(--shadow-2),inset 0 1px 0 rgba(255,255,255,.12);
}
.cta-bar h2{font-size:clamp(22px,2.4vw,28px);line-height:1.3;}
.cta-bar p{margin-top:10px;font-size:15px;color:var(--text-2);max-width:56ch;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg-1);border-top:1px solid var(--line-1);padding:64px 0 32px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:48px;}
.footer-brand .logo{margin-bottom:18px;}
.footer-brand p{font-size:15px;line-height:1.85;color:var(--text-2);max-width:30ch;}
.footer-social{display:flex;gap:12px;margin-top:22px;}
.footer-social a{
  width:38px;height:38px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line-1);color:var(--text-2);background:rgba(255,255,255,.02);
  transition:color 180ms var(--ease),border-color 180ms var(--ease),transform 240ms var(--ease);
}
.footer-social a:hover{color:var(--brand-300);border-color:var(--line-brand);transform:translateY(-2px);}
.footer-social svg{width:18px;height:18px;}
.footer-col h4{font-size:15px;font-weight:600;color:var(--text-1);margin-bottom:20px;}
.footer-col ul li{margin-bottom:12px;}
.footer-col ul li a{
  position:relative;font-size:14px;color:var(--text-2);padding-left:0;
  transition:color 180ms var(--ease),padding-left 240ms var(--ease);
}
.footer-col ul li a::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:3px;border-radius:50%;
  background:var(--brand-500);transform:translateY(-50%) scale(0);transition:transform 240ms var(--ease);
}
.footer-col ul li a:hover{color:var(--text-1);padding-left:12px;}
.footer-col ul li a:hover::before{transform:translateY(-50%) scale(1);}
.footer-info li{font-size:14px;color:var(--text-3);line-height:1.8;margin-bottom:10px;}
.footer-info b{color:var(--text-2);font-weight:600;}
.footer-bottom{
  margin-top:48px;padding-top:24px;border-top:1px solid var(--line-1);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--text-3);
}
.footer-note{margin-top:14px;font-size:12px;line-height:1.7;color:var(--text-3);}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 600ms var(--ease),transform 600ms var(--ease);}
.reveal.is-in{opacity:1;transform:translateY(0);}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  *{animation:none!important;transition:none!important;}
}

/* ---------- 响应式 ---------- */
@media (max-width:1200px){
  .bento-card--wide{grid-column:span 12;}
  .bento-card--s{grid-column:span 6;}
  .bento-card--m{grid-column:span 6;}
  .stat-strip{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:992px){
  .section{padding:64px 0;}
  .split{grid-template-columns:1fr;gap:36px;}
  .split-media{order:2;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
}
@media (max-width:900px){
  .nav-links{
    position:fixed;top:60px;left:0;right:0;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;
    padding:24px;
    background:rgba(5,7,15,.94);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    border-top:1px solid var(--line-1);
    transform:translateX(100%);
    transition:transform 280ms var(--ease);
    overflow-y:auto;
  }
  .nav-links.is-open{transform:translateX(0);}
  .nav-link{
    font-size:20px;line-height:64px;padding:0 16px;border-bottom:1px solid var(--line-1);
    border-radius:0;border-left:3px solid transparent;
  }
  .nav-link::after{display:none;}
  .nav-link.active{
    background:transparent;border:none;border-left:3px solid var(--brand-500);
    border-bottom:1px solid var(--line-1);color:var(--brand-300);padding:0 16px;
  }
  .nav-toggle{display:flex;}
  .header-actions .link-quiet{display:none;}
  .site-header{height:60px;}
  .site-header.is-scrolled{height:60px;}
  .hero{padding:128px 0 64px;}
  .cta-bar{padding:28px 24px;}
}
@media (max-width:768px){
  .container{padding:0 18px;}
  .section{padding:48px 0;}
  .footer-grid{grid-template-columns:1fr;}
  .bento-card--s,.bento-card--m{grid-column:span 12;}
  .stat-strip{grid-template-columns:1fr;margin-top:-24px;}
}
@media (max-width:520px){
  .hero h1{font-size:32px;}
  .hero-lead{font-size:16px;}
  .stat-value{font-size:30px;}
  .bento-card,.bento-card--media .media-body{padding:20px 18px;}
  .btn{height:44px;padding:0 20px;font-size:14px;}
  .cta-bar{padding:24px 18px;}
}

/* roulang page: category5 */
:root{
  --bg-0:#05070F;--bg-1:#0A1020;--bg-2:#101A2E;
  --brand-500:#1FE0C0;--brand-600:#12BFA3;--brand-300:#7CF3DF;
  --accent-500:#FF7A45;--accent-300:#FFB088;--data-3:#7C6BFF;
  --text-1:#F2F6FF;--text-2:#A9B6CE;--text-3:#6C7A94;
  --line-1:rgba(255,255,255,.08);--line-brand:rgba(31,224,192,.28);
  --ok:#2FD48A;--warn:#F5B84A;--err:#FF5F6D;
  --r-s:10px;--r-m:16px;--r-l:22px;--r-xl:28px;
  --sh-1:0 1px 2px rgba(0,0,0,.4);--sh-2:0 12px 32px -12px rgba(0,0,0,.7);
  --glass:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  --t-col:180ms cubic-bezier(.22,.61,.36,1);
  --t-mov:240ms cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  background:var(--bg-0);
  color:var(--text-2);
  font-family:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Source Han Sans SC',sans-serif;
  font-size:16px;line-height:1.9;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color var(--t-col),border-color var(--t-col),background var(--t-col)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
svg{display:block}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}
.mono{font-family:'Inter','JetBrains Mono',monospace;font-variant-numeric:tabular-nums}

/* ---------- header / nav ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(5,7,15,.72);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-1);
  transition:background var(--t-col),height var(--t-mov);
}
.header-inner{display:flex;align-items:center;gap:32px;height:76px;transition:height var(--t-mov)}
.site-header.is-scrolled{background:rgba(5,7,15,.9)}
.site-header.is-scrolled .header-inner{height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-1);letter-spacing:.01em;white-space:nowrap}
.logo svg{width:26px;height:26px;color:var(--brand-500);flex:none}
.nav-links{display:flex;align-items:center;gap:32px;margin-left:auto}
.nav-link{position:relative;font-size:15px;color:var(--text-2);padding:6px 2px}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:-4px;width:16px;height:2px;border-radius:2px;
  background:var(--brand-500);box-shadow:0 0 8px rgba(31,224,192,.7);
  transform:translateX(-50%) scaleX(0);transition:transform var(--t-mov);transform-origin:center;
}
.nav-link:hover{color:var(--text-1)}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{
  color:var(--brand-300);background:rgba(31,224,192,.10);
  border:1px solid rgba(31,224,192,.3);border-radius:999px;padding:10px 16px;
}
.nav-link.active::after{display:none}
.header-actions{display:flex;align-items:center;gap:18px}
.header-text-link{font-size:15px;color:var(--text-2)}
.header-text-link:hover{color:var(--brand-300)}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line-1);
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text-1);border-radius:2px;transition:transform var(--t-mov),opacity var(--t-col)}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer{
  position:fixed;inset:0;z-index:55;background:rgba(5,7,15,.92);
  -webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
  padding:96px 24px 32px;display:none;flex-direction:column;gap:0;overflow-y:auto;
}
.drawer.is-open{display:flex}
.drawer a{
  font-size:20px;color:var(--text-2);line-height:64px;border-bottom:1px solid var(--line-1);
  padding-left:14px;position:relative;
}
.drawer a.active{color:var(--brand-300)}
.drawer a.active::before{content:"";position:absolute;left:0;top:20px;bottom:20px;width:3px;border-radius:2px;background:var(--brand-500)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:999px;font-size:15px;font-weight:600;
  transition:transform var(--t-mov),box-shadow var(--t-col),background var(--t-col),color var(--t-col),border-color var(--t-col);
  white-space:nowrap;
}
.btn-primary{
  background:var(--brand-500);color:var(--bg-0);
  box-shadow:0 0 0 1px rgba(31,224,192,.35),0 10px 30px -8px rgba(31,224,192,.45);
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.5),0 14px 34px -8px rgba(31,224,192,.55)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
  background:transparent;border:1px solid var(--line-1);color:var(--text-1);
}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand-300)}
.btn-accent{
  background:var(--accent-500);color:#1a0a03;
  box-shadow:0 0 0 1px rgba(255,122,69,.35),0 10px 30px -10px rgba(255,122,69,.5);
}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}
.btn-sm{height:40px;padding:0 20px;font-size:14px}

/* ---------- hero ---------- */
.hero{
  position:relative;padding:170px 0 80px;overflow:hidden;
  background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,7,15,.62) 0%,rgba(5,7,15,.86) 55%,rgba(5,7,15,.96) 100%);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.05;
  background-image:linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
  background-size:24px 24px;
}
.hero .container{position:relative;z-index:2;max-width:900px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.2em;
  color:var(--brand-500);text-transform:uppercase;margin-bottom:18px;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--brand-500);opacity:.8}
.hero h1{
  font-size:clamp(32px,4.6vw,52px);line-height:1.16;font-weight:800;color:var(--text-1);
  letter-spacing:-.01em;margin-bottom:20px;
}
.hero p{font-size:17px;line-height:2;color:var(--text-2);max-width:72ch}
.hero-meta{display:flex;flex-wrap:wrap;gap:28px;margin-top:32px;padding-top:26px;border-top:1px solid var(--line-1)}
.hero-meta li{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-2)}
.hero-meta svg{width:17px;height:17px;color:var(--brand-500);flex:none}
.hero-meta b{color:var(--text-1);font-weight:600}

/* ---------- section base ---------- */
.section{padding:96px 0}
.section--alt{background:var(--bg-1);border-top:1px solid var(--line-1);border-bottom:1px solid var(--line-1)}
.section-head{max-width:760px;margin-bottom:44px}
.section-head h2{
  font-size:clamp(25px,3vw,36px);line-height:1.3;font-weight:700;color:var(--text-1);letter-spacing:-.01em;
}
.section-head h2 .mark{
  display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:12px;
  background:linear-gradient(135deg,var(--brand-500),var(--accent-500));vertical-align:middle;
}
.section-head p{margin-top:14px;font-size:16px;color:var(--text-2);max-width:60ch}
.section-head p.small{font-size:14px;color:var(--text-3)}

/* ---------- prep strip ---------- */
.prep{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line-1);border:1px solid var(--line-1);border-radius:var(--r-l);overflow:hidden;
}
.prep-item{background:var(--bg-2);padding:24px;transition:background var(--t-col)}
.prep-item:hover{background:#132039}
.prep-item .idx{font-size:13px;color:var(--brand-500);letter-spacing:.12em}
.prep-item h3{font-size:16px;font-weight:600;color:var(--text-1);margin:10px 0 8px;line-height:1.5}
.prep-item p{font-size:14px;line-height:1.8;color:var(--text-3)}

/* ---------- faq layout ---------- */
.faq-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:44px;align-items:start}
.faq-group{margin-bottom:40px}
.faq-group:last-child{margin-bottom:0}
.faq-group-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.faq-group-head span.dot{width:8px;height:8px;border-radius:50%;background:var(--brand-500);box-shadow:0 0 10px rgba(31,224,192,.6)}
.faq-group-head h3{font-size:18px;font-weight:600;color:var(--text-1)}
.faq-list{border-top:1px solid var(--line-1)}
.faq-item{border-bottom:1px solid var(--line-1)}
.faq-q{
  width:100%;display:flex;align-items:flex-start;gap:16px;text-align:left;
  padding:20px 0;font-size:17px;font-weight:600;color:var(--text-1);line-height:1.6;
  transition:color var(--t-col);
}
.faq-q:hover{color:var(--brand-300)}
.faq-icon{
  flex:none;width:24px;height:24px;border-radius:50%;border:1px solid var(--line-brand);
  color:var(--brand-500);display:inline-flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:400;line-height:1;margin-top:4px;
  transition:transform var(--t-mov),background var(--t-col),color var(--t-col);
}
.faq-item.is-open .faq-icon{transform:rotate(45deg);background:var(--brand-500);color:var(--bg-0)}
.faq-a{max-height:0;overflow:hidden;opacity:0;transition:max-height 320ms cubic-bezier(.22,.61,.36,1),opacity var(--t-col)}
.faq-item.is-open .faq-a{opacity:1}
.faq-a-inner{padding:0 0 22px 40px;max-width:72ch}
.faq-a-inner p{font-size:16px;line-height:1.95;color:var(--text-2)}
.faq-a-inner ol{margin-top:10px;counter-reset:faqstep}
.faq-a-inner ol li{
  position:relative;padding-left:30px;margin-top:8px;font-size:15px;line-height:1.9;color:var(--text-2);
  counter-increment:faqstep;
}
.faq-a-inner ol li::before{
  content:counter(faqstep,decimal-leading-zero);position:absolute;left:0;top:0;
  font-family:'Inter','JetBrains Mono',monospace;font-size:13px;color:var(--brand-500);
}
.faq-a-inner .note{
  display:inline-block;margin-top:12px;font-size:14px;color:var(--accent-300);
  background:rgba(255,122,69,.08);border:1px solid rgba(255,122,69,.22);
  border-radius:var(--r-s);padding:8px 14px;
}

/* ---------- faq side ---------- */
.faq-side{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.side-card{
  background:var(--glass);border:1px solid var(--line-1);border-radius:var(--r-l);
  box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.12);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  padding:22px;
}
.side-card h4{font-size:14px;letter-spacing:.08em;color:var(--text-3);font-weight:600;margin-bottom:14px}
.side-nav li+li{margin-top:4px}
.side-nav a{
  display:flex;align-items:center;gap:10px;font-size:15px;color:var(--text-2);
  padding:9px 10px;border-radius:var(--r-s);border:1px solid transparent;
}
.side-nav a:hover{color:var(--text-1);background:rgba(255,255,255,.04);border-color:var(--line-1)}
.side-nav a::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--text-3);transition:background var(--t-col)}
.side-nav a:hover::before{background:var(--brand-500)}
.side-card .side-note{font-size:13px;line-height:1.8;color:var(--text-3);margin-top:12px}
.side-cta{background:linear-gradient(160deg,rgba(31,224,192,.10),rgba(255,122,69,.06));border-color:var(--line-brand)}
.side-cta p{font-size:15px;color:var(--text-1);font-weight:600;margin-bottom:6px}
.side-cta span{display:block;font-size:13px;color:var(--text-3);line-height:1.8;margin-bottom:16px}

/* ---------- form ---------- */
.ask-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start}
.ask-list{margin-top:22px}
.ask-list li{display:flex;gap:12px;font-size:15px;line-height:1.9;color:var(--text-2);padding:12px 0;border-bottom:1px solid var(--line-1)}
.ask-list li:last-child{border-bottom:0}
.ask-list svg{width:18px;height:18px;color:var(--brand-500);flex:none;margin-top:5px}
.ask-contact{margin-top:24px;font-size:14px;color:var(--text-3)}
.ask-contact b{color:var(--text-1);font-weight:600}
.form-card{
  background:var(--glass);border:1px solid var(--line-1);border-radius:24px;padding:32px;
  box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.12);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;color:var(--text-2);margin-bottom:8px}
.field label .req{color:var(--accent-500);margin-left:4px}
.input,.select,.textarea{
  width:100%;background:rgba(255,255,255,.04);border:1px solid var(--line-1);
  border-radius:12px;color:var(--text-1);font-size:15px;padding:0 16px;height:48px;
  transition:border-color var(--t-col),box-shadow var(--t-col),background var(--t-col);
  font-family:inherit;
}
.textarea{height:auto;min-height:120px;padding:14px 16px;line-height:1.8;resize:vertical}
.select{
  appearance:none;-webkit-appearance:none;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,var(--text-3) 50%),linear-gradient(135deg,var(--text-3) 50%,transparent 50%);
  background-position:calc(100% - 20px) 21px,calc(100% - 15px) 21px;
  background-size:5px 5px,5px 5px;background-repeat:no-repeat;
}
.input::placeholder,.textarea::placeholder{color:#4d5a72}
.input:focus,.select:focus,.textarea:focus{
  outline:none;border-color:var(--brand-500);box-shadow:0 0 0 3px rgba(31,224,192,.18);
}
.field.has-error .input,.field.has-error .select,.field.has-error .textarea{border-color:var(--err)}
.field .err-msg{display:none;font-size:14px;color:var(--err);margin-top:8px}
.field.has-error .err-msg{display:block}
.check-row{display:flex;align-items:flex-start;gap:10px;margin:6px 0 22px}
.check-row input{position:absolute;opacity:0;width:0;height:0}
.check-box{
  flex:none;width:18px;height:18px;border-radius:5px;border:1px solid var(--line-1);
  background:rgba(255,255,255,.04);margin-top:4px;position:relative;transition:background var(--t-col),border-color var(--t-col);
}
.check-row input:checked + .check-box{background:var(--brand-500);border-color:var(--brand-500)}
.check-row input:checked + .check-box::after{
  content:"";position:absolute;left:5px;top:1px;width:6px;height:11px;
  border:solid var(--bg-0);border-width:0 2px 2px 0;transform:rotate(42deg);
}
.check-row input:focus-visible + .check-box{outline:2px solid var(--brand-500);outline-offset:2px}
.check-row label{font-size:14px;color:var(--text-3);line-height:1.7;cursor:pointer}
.form-foot{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.form-tip{font-size:13px;color:var(--text-3)}
.form-state{margin-top:16px;font-size:14px;display:none}
.form-state.is-ok{display:block;color:var(--ok)}
.form-state.is-err{display:block;color:var(--err)}

/* ---------- related categories ---------- */
.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.rel-card{
  display:flex;flex-direction:column;background:var(--bg-2);border:1px solid var(--line-1);
  border-radius:var(--r-l);overflow:hidden;transition:transform var(--t-mov),border-color var(--t-col),box-shadow var(--t-col);
}
.rel-card:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:var(--sh-2)}
.rel-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--bg-2)}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s cubic-bezier(.22,.61,.36,1)}
.rel-card:hover .rel-thumb img{transform:scale(1.04)}
.rel-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.rel-body h3{font-size:17px;font-weight:600;color:var(--text-1);line-height:1.5}
.rel-body p{font-size:14px;line-height:1.8;color:var(--text-3);flex:1}
.rel-more{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--brand-300)}
.rel-more svg{width:15px;height:15px;transition:transform var(--t-mov)}
.rel-card:hover .rel-more svg{transform:translateX(4px)}

/* ---------- cta strip ---------- */
.cta-strip{
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  background:var(--glass);border:1px solid var(--line-1);border-radius:var(--r-xl);
  padding:36px 40px;box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.12);
  -webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
}
.cta-strip h2{font-size:clamp(22px,2.4vw,28px);color:var(--text-1);font-weight:700;line-height:1.4}
.cta-strip p{font-size:15px;color:var(--text-3);margin-top:8px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-1);border-top:1px solid var(--line-1);padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-brand p{font-size:14px;color:var(--text-3);margin-top:14px;line-height:1.8;max-width:30ch}
.footer-social{display:flex;gap:12px;margin-top:20px}
.footer-social a{
  width:36px;height:36px;border-radius:10px;border:1px solid var(--line-1);
  display:inline-flex;align-items:center;justify-content:center;color:var(--text-3);
}
.footer-social a:hover{color:var(--brand-300);border-color:var(--line-brand)}
.footer-social svg{width:17px;height:17px}
.footer-col h4{font-size:14px;color:var(--text-1);font-weight:600;margin-bottom:18px;letter-spacing:.04em}
.footer-col li+li{margin-top:10px}
.footer-col a{
  position:relative;font-size:14px;color:var(--text-3);padding-left:0;display:inline-block;
}
.footer-col a::before{
  content:"";position:absolute;left:-12px;top:50%;width:5px;height:5px;border-radius:50%;
  background:var(--brand-500);transform:translateY(-50%);opacity:0;transition:opacity var(--t-col);
}
.footer-col a:hover{color:var(--text-1)}
.footer-col a:hover::before{opacity:1}
.footer-info li{font-size:14px;color:var(--text-3)}
.footer-info b{color:var(--text-2);font-weight:600}
.footer-bottom{
  border-top:1px solid var(--line-1);padding:22px 0 26px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--text-3);
}
.footer-bottom .legal{font-size:12px;color:var(--text-3);opacity:.85;flex-basis:100%}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 600ms cubic-bezier(.22,.61,.36,1),transform 600ms cubic-bezier(.22,.61,.36,1)}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr;gap:32px}
}
@media (max-width:992px){
  .section{padding:64px 0}
  .hero{padding:150px 0 64px}
  .faq-layout{grid-template-columns:1fr;gap:32px}
  .faq-side{position:static;order:-1;flex-direction:row;flex-wrap:wrap}
  .faq-side .side-card{flex:1 1 260px}
  .ask-grid{grid-template-columns:1fr;gap:32px}
  .prep{grid-template-columns:repeat(2,1fr)}
  .related-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .nav-links,.header-actions .header-text-link,.header-actions .btn{display:none}
  .nav-toggle{display:flex;margin-left:auto}
  .header-actions{margin-left:auto}
}
@media (max-width:768px){
  .container{padding:0 18px}
  .section{padding:52px 0}
  .hero{padding:132px 0 52px}
  .hero h1{font-size:clamp(28px,7.4vw,38px)}
  .hero-meta{gap:16px 24px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .cta-strip{padding:28px 22px}
  .form-card{padding:22px}
  .faq-a-inner{padding-left:0}
  .faq-q{font-size:16px}
  .related-grid{grid-template-columns:1fr}
}
@media (max-width:520px){
  body{font-size:15px}
  .section{padding:44px 0}
  .prep{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-meta{flex-direction:column;gap:12px}
  .btn{width:100%;padding:0 18px}
  .cta-actions,.form-foot{width:100%}
  .cta-actions .btn,.form-foot .btn{width:100%}
}