/* roulang page: index */
:root{
  --ink-950:#0B0C0D; --ink-900:#101113; --ink-800:#17191C; --ink-700:#22252A; --ink-600:#2E3238;
  --sand-50:#F5F2EC; --sand-100:#EAE4D9; --sand-200:#DCD5C7;
  --brass-500:#C08A4B; --brass-400:#D9A263; --brass-600:#A2703A;
  --neon-400:#5FE3C0; --neon-300:#8BF0D6;
  --t-main:#F2F0EC; --t-sub:#A5A8AE; --t-weak:#6E7278;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --r-big:26px; --r-card:18px; --r-sm:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--ink-950); color:var(--t-main);
  font-family:'PingFang SC','HarmonyOS Sans SC','Source Han Sans SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px; line-height:1.9; -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,p{margin:0}
:focus-visible{outline:2px solid var(--neon-400);outline-offset:2px;border-radius:6px}
::selection{background:rgba(192,138,75,.35);color:#fff}

.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
@media(max-width:768px){.wrap{padding:0 16px}}

.mono{font-family:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;font-variant-numeric:tabular-nums}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(11,12,13,.88);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;pointer-events:none;
  background:linear-gradient(90deg,transparent,rgba(95,227,192,.55),transparent);
}
.nav-inner{height:64px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em;font-size:17px;line-height:1}
.brand-mark{
  display:inline-flex;align-items:center;gap:3px;
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;color:var(--neon-400);font-size:15px;
}
.brand-dot{width:5px;height:5px;border-radius:999px;background:var(--neon-400);box-shadow:0 0 8px rgba(95,227,192,.85)}
.brand-text{white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:22px;margin-left:auto}
.nav-link{
  position:relative;font-size:14px;color:var(--t-sub);padding:6px 0;transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--neon-400),rgba(95,227,192,0));
  transform:scaleX(0);transform-origin:left;transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--t-main)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--t-main);font-weight:600}
.nav-link.active::after{transform:scaleX(1);box-shadow:0 0 10px rgba(95,227,192,.6)}
.nav-link.active::before{
  content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);
  width:6px;height:6px;border-radius:999px;background:var(--neon-400);box-shadow:0 0 8px rgba(95,227,192,.8);
}
.nav-cta{
  margin-left:22px;display:inline-flex;align-items:center;gap:8px;
  padding:10px 20px;border-radius:999px;background:var(--brass-500);color:var(--ink-950);
  font-size:14px;font-weight:700;transition:all .2s var(--ease);
}
.nav-cta:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
.burger{display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line-strong);align-items:center;justify-content:center;margin-left:auto}
.burger span{display:block;width:18px;height:2px;background:var(--t-main);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--t-main)}
.burger span::before{top:-6px}.burger span::after{top:6px}

.drawer{
  position:fixed;inset:0;z-index:80;background:rgba(11,12,13,.98);display:none;
  flex-direction:column;padding:20px 20px 40px;
}
.drawer.open{display:flex}
.drawer-top{display:flex;align-items:center;justify-content:space-between;height:44px}
.drawer-close{width:44px;height:44px;border-radius:12px;border:1px solid var(--line-strong);display:flex;align-items:center;justify-content:center;font-size:20px;line-height:1}
.drawer-nav{margin-top:28px;display:flex;flex-direction:column;gap:4px}
.drawer-nav a{
  font-size:20px;padding:14px 0 14px 14px;border-left:2px solid transparent;color:var(--t-sub);
  transition:all .18s var(--ease);
}
.drawer-nav a.active,.drawer-nav a:hover{color:var(--t-main);border-left-color:var(--neon-400)}
.drawer-cta{margin-top:28px;display:block;text-align:center;padding:14px;border-radius:999px;background:var(--brass-500);color:var(--ink-950);font-weight:700}

@media(max-width:1023px){
  .nav-links,.nav-cta{display:none}
  .burger{display:flex}
}

/* ---------- shared ---------- */
.section{padding:96px 0}
@media(max-width:1023px){.section{padding:72px 0}}
@media(max-width:768px){.section{padding:56px 0}}
.eyebrow{
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  font-size:12px;letter-spacing:.08em;color:var(--neon-400);margin-bottom:14px;
}
.h2{
  font-size:clamp(24px,2.9vw,36px);font-weight:700;line-height:1.18;letter-spacing:-.015em;
}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.sec-sub{color:var(--t-sub);font-size:15px;margin-top:12px;max-width:620px}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;background:var(--brass-500);color:var(--ink-950);
  font-size:15px;font-weight:700;transition:all .2s var(--ease);
}
.btn-main:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:999px;border:1px solid var(--line-strong);color:var(--t-main);
  font-size:15px;font-weight:600;transition:all .2s var(--ease);background:transparent;
}
.btn-ghost:hover{border-color:var(--neon-400);color:#fff;box-shadow:0 0 0 3px rgba(95,227,192,.1)}
.btn-text{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--neon-400);
  border-bottom:1px solid rgba(95,227,192,.35);padding-bottom:2px;transition:all .2s var(--ease);
}
.btn-text:hover{border-bottom-color:var(--neon-400);gap:10px}
.badge{
  display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:999px;
  font-size:12px;letter-spacing:.06em;background:rgba(95,227,192,.12);color:var(--neon-400);
  border:1px solid rgba(95,227,192,.22);line-height:1.6;
}
.badge-brass{background:transparent;color:var(--brass-400);border-color:rgba(192,138,75,.45)}

/* ---------- hero ---------- */
.hero{padding:76px 0 88px;position:relative;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(680px 320px at 18% 0%,rgba(192,138,75,.10),transparent 70%);
}
.hero-grid{display:grid;grid-template-columns:55fr 45fr;gap:56px;align-items:center;position:relative}
.hero h1{
  font-size:clamp(34px,4.6vw,58px);line-height:1.08;font-weight:800;letter-spacing:-.02em;margin:12px 0 20px;
}
.hero h1 em{font-style:normal;color:var(--neon-300)}
.hero-sub{font-size:17px;color:var(--t-sub);max-width:520px;line-height:1.9}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:48px;border-top:1px solid var(--line);padding-top:24px}
.hero-stat .num{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:30px;font-weight:700;color:var(--brass-400);line-height:1.2}
.hero-stat .lbl{font-size:12px;letter-spacing:.06em;color:var(--t-weak);margin-top:4px}
.hero-card{
  position:relative;border-radius:var(--r-big);overflow:hidden;aspect-ratio:9/16;max-height:600px;
  border:1px solid var(--line);box-shadow:0 24px 60px rgba(0,0,0,.5);
  background-image:url('/assets/images/backpic/back-1.png');background-size:cover;background-position:center;
  -webkit-backdrop-filter:blur(0);backdrop-filter:blur(0);
}
.hero-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,12,13,.15) 0%,rgba(11,12,13,.55) 55%,rgba(11,12,13,.95) 100%)}
.hero-card-top{position:absolute;top:18px;left:18px;right:18px;display:flex;justify-content:space-between;gap:10px;z-index:2}
.pill{
  display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;
  background:rgba(11,12,13,.7);border:1px solid var(--line-strong);
  font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:12px;color:var(--t-main);
}
.play{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;
  width:56px;height:56px;border-radius:999px;border:1.5px solid var(--neon-400);
  display:flex;align-items:center;justify-content:center;background:rgba(11,12,13,.55);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.play:hover{transform:translate(-50%,-50%) scale(1.07);box-shadow:0 0 0 6px rgba(95,227,192,.12)}
.play svg{width:18px;height:18px;fill:var(--neon-400);margin-left:3px}
.hero-card-bot{position:absolute;left:18px;right:18px;bottom:20px;z-index:2}
.sub-line{height:8px;border-radius:999px;background:rgba(255,255,255,.22);margin-bottom:10px}
.sub-line.short{width:56%;background:rgba(255,255,255,.13)}
.hero-card-label{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:12px;color:var(--neon-300);margin-bottom:12px;letter-spacing:.06em}

@media(max-width:1023px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-card{max-width:360px;margin:0 auto;max-height:none;width:100%}
}
@media(max-width:640px){
  .hero{padding:48px 0 56px}
  .hero-stats{gap:10px}
  .hero-stat .num{font-size:24px}
  .hero-actions .btn-main,.hero-actions .btn-ghost{flex:1 1 100%}
}

/* ---------- rail ---------- */
.rail{display:flex;gap:16px;overflow-x:auto;padding:4px 4px 20px;scroll-snap-type:x mandatory;-ms-overflow-style:none;scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.rail-card{
  position:relative;flex:0 0 240px;aspect-ratio:9/16;border-radius:var(--r-card);overflow:hidden;
  scroll-snap-align:start;border:1px solid var(--line);transition:transform .22s var(--ease),border-color .22s var(--ease);
  background:var(--ink-800);
}
.rail-card:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45)}
.rail-card img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.rail-card:hover img{transform:scale(1.04)}
.rail-mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,12,13,0) 35%,rgba(11,12,13,.6) 70%,rgba(11,12,13,.96) 100%)}
.rail-no{
  position:absolute;top:12px;left:12px;font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;
  font-size:12px;padding:3px 9px;border-radius:999px;background:rgba(11,12,13,.7);
  border:1px solid rgba(95,227,192,.35);color:var(--neon-300);
}
.rail-title{position:absolute;left:14px;right:14px;bottom:14px;font-size:14px;line-height:1.55;font-weight:600;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.step{padding:32px 28px;border-right:1px dashed rgba(255,255,255,.12)}
.step:last-child{border-right:none}
.step-no{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:40px;font-weight:700;color:var(--brass-500);line-height:1;letter-spacing:-.02em}
.step h3{font-size:18px;font-weight:600;margin:16px 0 8px}
.step p{font-size:14px;color:var(--t-sub);line-height:1.8}
@media(max-width:768px){
  .steps{grid-template-columns:1fr}
  .step{border-right:none;border-bottom:1px dashed rgba(255,255,255,.12);padding:24px 4px}
  .step:last-child{border-bottom:none}
  .step-no{font-size:32px}
}

/* ---------- list ---------- */
.list-layout{display:grid;grid-template-columns:1fr 2fr;gap:56px;align-items:start}
.sticky-head{position:sticky;top:96px}
.check-list{border-top:1px solid var(--line)}
.check-row{
  display:grid;grid-template-columns:56px 1fr 24px;gap:16px;align-items:center;
  padding:22px 12px;border-bottom:1px solid var(--line);min-height:72px;
  transition:background .2s var(--ease),box-shadow .2s var(--ease);
}
.check-row:hover{background:var(--ink-800);box-shadow:inset 2px 0 0 var(--neon-400)}
.check-no{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:15px;color:var(--t-weak)}
.check-title{font-size:16px;font-weight:600}
.check-desc{font-size:14px;color:var(--t-sub);margin-top:2px;line-height:1.75}
.check-arrow{color:var(--t-weak);transition:transform .2s var(--ease),color .2s var(--ease)}
.check-row:hover .check-arrow{color:var(--neon-400);transform:translateX(3px)}
@media(max-width:1023px){.list-layout{grid-template-columns:1fr;gap:28px}.sticky-head{position:static}}

/* ---------- post grid ---------- */
.post-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.post-card{
  display:grid;grid-template-columns:120px 1fr;gap:18px;padding:18px;
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-card);
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.post-card:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45);box-shadow:var(--shadow-hover)}
.post-thumb{width:120px;aspect-ratio:1/1;border-radius:var(--r-sm);overflow:hidden;background:var(--ink-700)}
.post-thumb img{width:100%;height:100%;object-fit:cover}
.post-body{min-width:0}
.post-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.post-title{font-size:16px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-excerpt{font-size:13.5px;color:var(--t-sub);line-height:1.75;margin-top:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-date{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:12px;color:var(--t-weak);margin-top:10px}
.empty{
  grid-column:1/-1;border:1px dashed rgba(255,255,255,.18);border-radius:var(--r-card);
  min-height:160px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  color:var(--t-sub);font-size:15px;padding:28px;
}
.sec-foot{margin-top:28px;display:flex;justify-content:center}
@media(max-width:900px){.post-grid{grid-template-columns:1fr}}
@media(max-width:520px){
  .post-card{grid-template-columns:1fr}
  .post-thumb{width:100%;aspect-ratio:16/9}
}

/* ---------- quotes ---------- */
.quote-rail{display:flex;gap:16px;overflow-x:auto;padding-bottom:16px;scrollbar-width:none;-ms-overflow-style:none}
.quote-rail::-webkit-scrollbar{display:none}
.quote-card{
  flex:0 0 300px;padding:22px;border-radius:var(--r-card);background:var(--ink-800);
  border:1px solid var(--line);position:relative;
}
.quote-card::before{
  content:"“";position:absolute;top:6px;right:18px;font-size:54px;line-height:1;
  color:rgba(192,138,75,.28);font-family:Georgia,serif;
}
.quote-text{font-size:14.5px;color:var(--t-main);line-height:1.85;min-height:80px}
.quote-user{display:flex;align-items:center;gap:10px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.avatar{width:32px;height:32px;border-radius:999px;background:rgba(95,227,192,.14);color:var(--neon-300);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.quote-name{font-size:13px;color:var(--t-main)}
.quote-time{font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:12px;color:var(--t-weak)}

/* ---------- cta ---------- */
.cta-band{
  position:relative;border-radius:var(--r-big);overflow:hidden;padding:56px 48px;
  border:1px solid var(--line);
  background-image:linear-gradient(115deg,rgba(192,138,75,.16),rgba(192,138,75,0) 55%),url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
}
.cta-band::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(11,12,13,.94),rgba(11,12,13,.72));pointer-events:none}
.cta-inner{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap}
.cta-inner h2{font-size:clamp(22px,2.7vw,32px);font-weight:700;line-height:1.25;letter-spacing:-.015em}
.cta-inner p{color:var(--t-sub);font-size:15px;margin-top:12px;max-width:520px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}
@media(max-width:768px){
  .cta-band{padding:36px 22px}
  .cta-actions{width:100%}
  .cta-actions .btn-main,.cta-actions .btn-ghost{flex:1 1 100%}
}

/* ---------- faq ---------- */
.faq-layout{display:grid;grid-template-columns:1fr 1.6fr;gap:56px;align-items:start}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 4px;font-size:16px;font-weight:600;text-align:left;transition:color .18s var(--ease);
}
.faq-q:hover{color:var(--neon-300)}
.faq-ic{flex:0 0 auto;font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:18px;color:var(--brass-400);transition:transform .22s var(--ease)}
.faq-item.is-open .faq-ic{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s var(--ease)}
.faq-item.is-open .faq-a{max-height:340px}
.faq-a p{font-size:15px;color:var(--t-sub);line-height:1.85;padding:0 4px 22px}
@media(max-width:1023px){.faq-layout{grid-template-columns:1fr;gap:24px}}

/* ---------- footer ---------- */
.site-footer{background:var(--ink-950);border-top:1px solid var(--line);position:relative;margin-top:96px}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(95,227,192,.55),transparent);
}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding:64px 0 44px}
.footer-brand{font-size:17px;font-weight:800;display:flex;align-items:center;gap:10px}
.footer-desc{font-size:14px;color:var(--t-sub);line-height:1.9;margin-top:14px;max-width:320px}
.footer-col h4{font-size:13px;letter-spacing:.08em;color:var(--t-weak);font-weight:600;margin-bottom:16px;font-family:'JetBrains Mono',ui-monospace,Menlo,monospace}
.footer-col a,.footer-col li{display:block;font-size:14px;color:var(--t-sub);margin-bottom:10px;transition:all .18s var(--ease)}
.footer-col a:hover{color:#fff;transform:translateX(-2px)}
.footer-bottom{
  border-top:1px solid var(--line);padding:20px 0 28px;display:flex;justify-content:space-between;
  gap:16px;flex-wrap:wrap;font-size:12px;color:var(--t-weak);
}
.footer-bottom .mono{color:var(--t-weak)}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px;padding:48px 0 32px}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr}}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .22s var(--ease),transform .22s var(--ease)}
.reveal.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}
}

/* roulang page: category1 */
:root{
    --ink-950:#0B0C0D; --ink-900:#101113; --ink-800:#17191C; --ink-700:#22252A; --ink-600:#2E3238;
    --sand-50:#F5F2EC; --sand-100:#EAE4D9; --sand-200:#DCD5C7;
    --brass-500:#C08A4B; --brass-400:#D9A263; --brass-600:#A2703A;
    --neon-400:#5FE3C0; --neon-300:#8BF0D6;
    --text-1:#F2F0EC; --text-2:#A5A8AE; --text-3:#6E7278;
    --line:rgba(255,255,255,.08);
    --line-strong:rgba(255,255,255,.18);
    --r-xl:26px; --r-lg:18px; --r-md:14px; --r-sm:12px;
    --mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    --sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
    --shadow-hover:0 18px 40px rgba(0,0,0,.45);
    --ease:cubic-bezier(.22,.61,.36,1);
  }
  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  .site-body{
    margin:0;padding:0;background:var(--ink-950);color:var(--text-1);
    font-family:var(--sans);font-size:16px;line-height:1.9;
    -webkit-font-smoothing:antialiased;
  }
  img{display:block;max-width:100%;height:auto;}
  .mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.02em;}
  .wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 32px;}
  .content-narrow{max-width:1120px;margin:0 auto;}

  /* ---------- header ---------- */
  .site-header{
    position:sticky;top:0;z-index:80;
    background:rgba(11,12,13,.88);
    -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  }
  .site-header::after{
    content:"";display:block;height:1px;
    background:linear-gradient(90deg,transparent,rgba(95,227,192,.55) 45%,transparent);
  }
  .nav-inner{display:flex;align-items:center;gap:28px;height:64px;}
  .brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto;}
  .brand-mark{font-family:var(--mono);font-size:16px;color:var(--neon-400);letter-spacing:0;line-height:1;display:inline-flex;align-items:center;gap:2px;}
  .brand-dot{width:6px;height:6px;border-radius:50%;background:var(--neon-400);display:inline-block;box-shadow:0 0 8px rgba(95,227,192,.75);}
  .brand-text{font-size:16px;font-weight:700;color:var(--text-1);letter-spacing:-.01em;}
  .nav-links{display:flex;align-items:center;gap:24px;margin-left:auto;}
  .nav-link{
    position:relative;display:inline-block;padding:6px 0;
    font-size:13.5px;color:var(--text-2);text-decoration:none;
    transition:color .2s var(--ease);
  }
  .nav-link:hover{color:var(--text-1);}
  .nav-link::after{
    content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
    background:var(--neon-400);border-radius:2px;
    transform:scaleX(0);transform-origin:left;transition:transform .25s var(--ease);
    box-shadow:0 0 10px rgba(95,227,192,.6);
  }
  .nav-link:hover::after{transform:scaleX(1);}
  .nav-link.active{color:var(--text-1);font-weight:600;}
  .nav-link.active::after{transform:scaleX(1);}
  .nav-link.active::before{
    content:"";position:absolute;left:-10px;top:50%;width:6px;height:6px;border-radius:50%;
    background:var(--neon-400);transform:translateY(-50%);box-shadow:0 0 8px rgba(95,227,192,.8);
  }
  .nav-cta{
    margin-left:8px;flex:0 0 auto;
    display:inline-flex;align-items:center;justify-content:center;
    padding:10px 20px;border-radius:999px;
    background:var(--brass-500);color:var(--ink-950);
    font-size:14px;font-weight:600;text-decoration:none;
    transition:background .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
  }
  .nav-cta:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18);}
  .burger{
    display:none;width:44px;height:44px;margin-left:auto;
    align-items:center;justify-content:center;
    background:transparent;border:1px solid var(--line-strong);border-radius:12px;cursor:pointer;
  }
  .burger span,.burger span::before,.burger span::after{
    display:block;width:18px;height:2px;background:var(--text-1);border-radius:2px;
    transition:transform .22s var(--ease),opacity .22s var(--ease);
  }
  .burger span{position:relative;}
  .burger span::before{content:"";position:absolute;top:-6px;left:0;}
  .burger span::after{content:"";position:absolute;top:6px;left:0;}
  body.nav-open .burger span{background:transparent;}
  body.nav-open .burger span::before{transform:translateY(6px) rotate(45deg);}
  body.nav-open .burger span::after{transform:translateY(-6px) rotate(-45deg);}

  a:focus-visible,button:focus-visible,summary:focus-visible{
    outline:2px solid var(--neon-400);outline-offset:2px;border-radius:6px;
  }

  /* ---------- breadcrumb ---------- */
  .crumb{
    display:flex;flex-wrap:wrap;align-items:center;gap:8px;
    padding:26px 0 0;font-size:13px;color:var(--text-3);
  }
  .crumb a{color:var(--text-3);text-decoration:none;transition:color .2s var(--ease);}
  .crumb a:hover{color:var(--text-1);}
  .crumb .sep{color:var(--ink-600);}
  .crumb .now{color:var(--text-2);max-width:60vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

  /* ---------- page head ---------- */
  .page-head{
    display:grid;grid-template-columns:1fr 320px;gap:56px;align-items:center;
    padding:34px 0 64px;
  }
  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;
    font-family:var(--mono);font-size:12px;letter-spacing:.08em;
    color:var(--neon-400);text-transform:uppercase;
    padding:6px 12px;border-radius:999px;
    background:rgba(95,227,192,.12);border:1px solid rgba(95,227,192,.28);
  }
  .page-head h1{
    margin:20px 0 0;
    font-size:clamp(30px,3.9vw,46px);line-height:1.1;font-weight:800;letter-spacing:-.02em;
    color:var(--text-1);
  }
  .page-head .lede{
    margin:18px 0 0;font-size:17px;line-height:1.9;color:var(--text-2);max-width:56ch;
  }
  .head-facts{display:flex;flex-wrap:wrap;gap:28px;margin:28px 0 0;}
  .fact-num{font-family:var(--mono);font-size:28px;line-height:1;color:var(--brass-400);font-weight:600;}
  .fact-label{display:block;margin-top:8px;font-size:12px;letter-spacing:.06em;color:var(--text-3);}
  .head-media{
    position:relative;border-radius:var(--r-lg);overflow:hidden;
    border:1px solid var(--line);background:var(--ink-800);
    aspect-ratio:4 / 3;
  }
  .head-media img{width:100%;height:100%;object-fit:cover;}
  .head-media::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(to top,rgba(11,12,13,.55),rgba(11,12,13,0) 60%);
  }
  .head-media .media-tag{
    position:absolute;left:14px;top:14px;z-index:2;
    font-family:var(--mono);font-size:12px;letter-spacing:.06em;
    color:var(--neon-300);background:rgba(11,12,13,.72);
    border:1px solid rgba(95,227,192,.32);border-radius:999px;padding:5px 10px;
  }

  /* ---------- sections ---------- */
  .band{padding:72px 0;}
  .band-tight{padding:48px 0;}
  .sec-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:40px;}
  .sec-head h2{
    margin:0;font-size:clamp(24px,2.6vw,32px);line-height:1.2;font-weight:700;letter-spacing:-.01em;color:var(--text-1);
  }
  .sec-head p{margin:10px 0 0;font-size:15px;color:var(--text-2);max-width:60ch;}
  .sec-kicker{
    font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--brass-400);
    display:block;margin-bottom:12px;
  }

  /* ---------- timeline ---------- */
  .timeline{list-style:none;margin:0;padding:0;max-width:900px;}
  .tl-item{position:relative;display:grid;grid-template-columns:96px 1fr;gap:28px;padding-bottom:44px;}
  .tl-item:last-child{padding-bottom:0;}
  .tl-item:not(:last-child)::after{
    content:"";position:absolute;left:47px;top:58px;bottom:8px;width:1px;
    background:linear-gradient(to bottom,rgba(95,227,192,.45),rgba(255,255,255,.06));
  }
  .tl-num{
    font-family:var(--mono);font-size:40px;line-height:1;font-weight:600;
    color:var(--brass-500);padding-top:2px;
  }
  .tl-body h3{margin:0;font-size:20px;line-height:1.35;font-weight:600;color:var(--text-1);}
  .tl-body p{margin:10px 0 0;font-size:15px;line-height:1.9;color:var(--text-2);max-width:64ch;}
  .tl-tag{
    display:inline-block;margin-top:14px;
    font-family:var(--mono);font-size:12px;letter-spacing:.06em;
    color:var(--neon-300);background:rgba(95,227,192,.12);
    border:1px solid rgba(95,227,192,.26);border-radius:999px;padding:4px 11px;
  }

  /* ---------- checklist rows ---------- */
  .rows{border-top:1px solid var(--line);}
  .row-item{
    display:grid;grid-template-columns:64px 1fr 24px;gap:20px;align-items:center;
    padding:24px 16px 24px 18px;border-bottom:1px solid var(--line);
    min-height:76px;text-decoration:none;color:inherit;
    position:relative;transition:background .2s var(--ease);
  }
  .row-item::before{
    content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--neon-400);
    transform:scaleY(0);transform-origin:top;transition:transform .22s var(--ease);
  }
  .row-item:hover{background:var(--ink-800);}
  .row-item:hover::before{transform:scaleY(1);}
  .row-idx{font-family:var(--mono);font-size:14px;color:var(--brass-400);letter-spacing:.06em;}
  .row-main strong{display:block;font-size:16.5px;font-weight:600;color:var(--text-1);}
  .row-main span{display:block;margin-top:6px;font-size:14px;color:var(--text-2);line-height:1.8;}
  .row-arrow{font-family:var(--mono);font-size:16px;color:var(--text-3);transition:transform .2s var(--ease),color .2s var(--ease);}
  .row-item:hover .row-arrow{color:var(--neon-400);transform:translateX(3px);}

  /* ---------- contrast panel ---------- */
  .panel{
    position:relative;overflow:hidden;border-radius:var(--r-xl);
    background:var(--ink-900);border:1px solid var(--line);
    padding:44px 44px 48px;
  }
  .panel::before{
    content:"";position:absolute;inset:0;
    background:linear-gradient(115deg,rgba(192,138,75,.14),rgba(192,138,75,0) 58%);
    pointer-events:none;
  }
  .panel-grid{position:relative;display:grid;grid-template-columns:200px 1fr;gap:48px;align-items:start;}
  .panel-big{font-family:var(--mono);font-size:76px;line-height:.9;font-weight:600;color:var(--brass-500);}
  .panel-big small{display:block;margin-top:14px;font-family:var(--sans);font-size:12px;letter-spacing:.06em;color:var(--text-3);}
  .panel h2{margin:0 0 10px;font-size:clamp(22px,2.3vw,28px);line-height:1.25;font-weight:700;color:var(--text-1);}
  .panel .panel-lede{margin:0 0 24px;font-size:15px;color:var(--text-2);max-width:62ch;}
  .diff-list{list-style:none;margin:0;padding:0;display:grid;gap:16px;}
  .diff-list li{
    display:grid;grid-template-columns:10px 1fr;gap:14px;align-items:start;
    font-size:15px;line-height:1.85;color:var(--text-2);
  }
  .diff-list li::before{
    content:"";width:8px;height:8px;margin-top:11px;background:var(--brass-400);border-radius:2px;
  }
  .diff-list b{color:var(--text-1);font-weight:600;}

  /* ---------- FAQ ---------- */
  .faq-wrap{display:grid;grid-template-columns:320px 1fr;gap:64px;align-items:start;}
  .faq-side{position:sticky;top:96px;}
  .faq-side h2{margin:0;font-size:clamp(24px,2.5vw,32px);line-height:1.2;font-weight:700;color:var(--text-1);}
  .faq-side p{margin:14px 0 0;font-size:15px;color:var(--text-2);line-height:1.9;}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-item:first-child{border-top:1px solid var(--line);}
  .faq-item summary{
    list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
    padding:22px 0;font-size:16px;font-weight:600;color:var(--text-1);line-height:1.6;
  }
  .faq-item summary::-webkit-details-marker{display:none;}
  .faq-item summary::after{
    content:"+";flex:0 0 auto;font-family:var(--mono);font-size:20px;line-height:1;
    color:var(--neon-400);transition:transform .22s var(--ease);
  }
  .faq-item[open] summary::after{transform:rotate(45deg);}
  .faq-body{padding:0 0 24px;font-size:15px;line-height:1.9;color:var(--text-2);max-width:68ch;}

  /* ---------- CTA ---------- */
  .cta{
    position:relative;overflow:hidden;border-radius:var(--r-xl);
    background:var(--ink-900);border:1px solid var(--line);
    padding:52px 48px;display:flex;flex-wrap:wrap;gap:32px;align-items:center;justify-content:space-between;
  }
  .cta::before{
    content:"";position:absolute;inset:0;
    background:
      linear-gradient(120deg,rgba(192,138,75,.16),rgba(192,138,75,0) 55%),
      url("/assets/images/backpic/back-1.png") right center / cover no-repeat;
    opacity:.16;pointer-events:none;
  }
  .cta > *{position:relative;}
  .cta h2{margin:0;font-size:clamp(22px,2.4vw,30px);line-height:1.24;font-weight:700;color:var(--text-1);}
  .cta p{margin:12px 0 0;font-size:15px;color:var(--text-2);max-width:52ch;}
  .cta-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;}

  .btn-primary{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:13px 26px;border-radius:999px;border:1px solid transparent;
    background:var(--brass-500);color:var(--ink-950);
    font-size:14.5px;font-weight:600;text-decoration:none;
    transition:background .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
  }
  .btn-primary:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18);}
  .btn-primary:active{transform:translateY(0);}
  .btn-ghost{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:13px 24px;border-radius:999px;
    background:transparent;border:1px solid var(--line-strong);color:var(--text-1);
    font-size:14.5px;font-weight:500;text-decoration:none;
    transition:border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
  }
  .btn-ghost:hover{border-color:var(--neon-400);color:#fff;transform:translateY(-1px);}
  .link-arrow{
    display:inline-flex;align-items:center;gap:8px;
    font-size:14px;color:var(--text-2);text-decoration:none;padding-bottom:3px;
    border-bottom:1px solid rgba(165,168,174,.35);
    transition:color .2s var(--ease),border-color .2s var(--ease);
  }
  .link-arrow:hover{color:var(--text-1);border-color:var(--neon-400);}
  .link-arrow span{transition:transform .2s var(--ease);}
  .link-arrow:hover span{transform:translateX(3px);}

  /* ---------- footer ---------- */
  .site-footer{margin-top:64px;background:var(--ink-950);position:relative;}
  .site-footer::before{
    content:"";display:block;height:1px;
    background:linear-gradient(90deg,transparent,rgba(95,227,192,.55) 45%,transparent);
  }
  .footer-grid{
    display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:44px;
    padding:60px 0 44px;
  }
  .footer-brand{display:inline-flex;align-items:center;gap:10px;}
  .footer-desc{margin:16px 0 0;font-size:14px;line-height:1.9;color:var(--text-2);max-width:34ch;}
  .footer-col h4{margin:0 0 16px;font-size:13px;letter-spacing:.06em;font-weight:600;color:var(--text-1);}
  .footer-col a{display:block;font-size:14px;color:var(--text-2);text-decoration:none;padding:6px 0;transition:color .2s var(--ease),transform .2s var(--ease);}
  .footer-col a:hover{color:#fff;transform:translateX(2px);}
  .footer-col ul{list-style:none;margin:0;padding:0;}
  .footer-col li{font-size:14px;color:var(--text-2);padding:6px 0;line-height:1.8;}
  .footer-bottom{
    display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;
    padding:20px 0 32px;border-top:1px solid var(--line);
    font-size:12px;color:var(--text-3);
  }

  /* ---------- animations ---------- */
  .fade-up{animation:fadeUp .22s var(--ease) both;}
  @keyframes fadeUp{from{opacity:0;transform:translateY(12px);}to{opacity:1;transform:translateY(0);}}

  /* ---------- responsive ---------- */
  @media (max-width:1023px){
    .wrap{padding:0 24px;}
    .nav-links{
      position:fixed;left:0;right:0;top:56px;bottom:0;z-index:70;
      flex-direction:column;align-items:stretch;gap:0;
      margin:0;padding:20px 22px 40px;
      background:var(--ink-950);
      transform:translateX(100%);transition:transform .28s var(--ease);
      overflow-y:auto;
    }
    body.nav-open .nav-links{transform:translateX(0);}
    .nav-link{font-size:20px;padding:16px 0 16px 14px;border-left:2px solid transparent;color:var(--text-1);}
    .nav-link::after{display:none;}
    .nav-link.active{border-left-color:var(--neon-400);}
    .nav-link.active::before{display:none;}
    .nav-cta{display:none;}
    .burger{display:inline-flex;}
    .nav-inner{height:56px;}
    .page-head{grid-template-columns:1fr;gap:32px;padding:26px 0 44px;}
    .head-media{max-width:420px;display:none;}
    .faq-wrap{grid-template-columns:1fr;gap:32px;}
    .faq-side{position:static;}
    .panel-grid{grid-template-columns:1fr;gap:24px;}
    .band{padding:56px 0;}
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px;padding:44px 0 32px;}
  }
  @media (max-width:767px){
    .tl-item{grid-template-columns:56px 1fr;gap:18px;padding-bottom:32px;}
    .tl-num{font-size:28px;}
    .tl-item:not(:last-child)::after{left:26px;top:42px;}
    .row-item{grid-template-columns:48px 1fr;padding:20px 10px 20px 14px;gap:14px;}
    .row-arrow{display:none;}
    .panel{padding:30px 22px 34px;}
    .panel-big{font-size:56px;}
    .cta{padding:34px 22px;}
    .cta-actions{width:100%;}
    .cta-actions .btn-primary,.cta-actions .btn-ghost{width:100%;}
    .head-facts{gap:20px;}
    .fact-num{font-size:24px;}
  }
  @media (max-width:519px){
    .wrap{padding:0 16px;}
    .footer-grid{grid-template-columns:1fr;gap:28px;}
    .footer-bottom{flex-direction:column;align-items:flex-start;}
    .page-head h1{font-size:28px;}
    .crumb{padding-top:18px;}
    .band{padding:48px 0;}
  }
  @media (prefers-reduced-motion: reduce){
    *{animation:none !important;transition:none !important;scroll-behavior:auto !important;}
  }

/* roulang page: category2 */
:root{
  --ink-950:#0B0C0D;
  --ink-900:#101113;
  --ink-800:#17191C;
  --ink-700:#22252A;
  --ink-600:#2E3238;
  --sand-50:#F5F2EC;
  --sand-100:#EAE4D9;
  --sand-200:#DCD5C7;
  --brass-500:#C08A4B;
  --brass-400:#D9A263;
  --brass-600:#A2703A;
  --neon-400:#5FE3C0;
  --neon-300:#8BF0D6;
  --t-1:#F2F0EC;
  --t-2:#A5A8AE;
  --t-3:#6E7278;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --r-lg:26px;
  --r-md:18px;
  --r-sm:14px;
  --wrap:1240px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-950);
  color:var(--t-1);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
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}
:focus-visible{outline:2px solid var(--neon-400);outline-offset:2px;border-radius:4px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 32px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(11,12,13,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.site-header::after{
  content:"";display:block;height:1px;
  background:linear-gradient(90deg,rgba(95,227,192,.75),rgba(95,227,192,.08) 55%,transparent);
}
.nav-inner{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  font-family:var(--font-mono);font-size:15px;letter-spacing:.02em;
  color:var(--neon-400);display:inline-flex;align-items:center;
}
.brand-dot{
  width:5px;height:5px;border-radius:50%;
  background:var(--neon-400);display:inline-block;margin:0 2px;
  box-shadow:0 0 8px rgba(95,227,192,.9);
}
.brand-text{
  font-size:16px;font-weight:800;letter-spacing:-.01em;color:var(--t-1);white-space:nowrap;
}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:8px;flex:1}
.nav-link{
  position:relative;display:inline-block;
  padding:8px 12px;font-size:13.5px;color:var(--t-2);
  transition:color .18s ease;white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--neon-400);border-radius:2px;
  transform:scaleX(0);transform-origin:left;transition:transform .24s ease;
  box-shadow:0 0 10px rgba(95,227,192,.7);
}
.nav-link:hover{color:var(--t-1)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--t-1);font-weight:600}
.nav-link.active::before{
  content:"";position:absolute;left:2px;top:50%;transform:translateY(-50%);
  width:6px;height:6px;border-radius:50%;background:var(--neon-400);
  box-shadow:0 0 8px rgba(95,227,192,.85);
}
.nav-link.active::after{transform:scaleX(1)}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  height:38px;padding:0 20px;border-radius:999px;
  background:var(--brass-500);color:var(--ink-950);
  font-size:13.5px;font-weight:700;white-space:nowrap;
  transition:background .18s ease,transform .18s ease,box-shadow .18s ease;
}
.nav-cta:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
.nav-cta:active{transform:translateY(0)}
.burger{
  display:none;width:44px;height:44px;margin-left:auto;
  border:1px solid var(--line);border-radius:12px;
  align-items:center;justify-content:center;
}
.burger span{display:block;width:18px;height:2px;background:var(--t-1);position:relative;border-radius:2px}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--t-1);border-radius:2px;
}
.burger span::before{top:-6px}
.burger span::after{top:6px}

/* mobile drawer */
.drawer{
  position:fixed;inset:0;z-index:80;background:var(--ink-950);
  display:none;flex-direction:column;padding:16px 24px 40px;
}
.drawer.open{display:flex}
.drawer-top{display:flex;align-items:center;justify-content:space-between;height:56px}
.drawer-close{
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;
  font-size:24px;line-height:1;border:1px solid var(--line);border-radius:12px;color:var(--t-2);
}
.drawer-nav{margin-top:32px;display:flex;flex-direction:column;gap:6px}
.drawer-nav a{
  display:block;padding:14px 0 14px 16px;font-size:20px;color:var(--t-1);
  border-left:2px solid transparent;
}
.drawer-nav a.active{border-left-color:var(--neon-400);color:var(--t-1);font-weight:700}
.drawer-nav a:not(.active){color:var(--t-2)}
.drawer-cta{
  margin-top:28px;display:inline-flex;align-items:center;justify-content:center;
  height:48px;border-radius:999px;background:var(--brass-500);color:var(--ink-950);
  font-weight:700;
}

/* ---------- breadcrumb ---------- */
.crumb{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13px;color:var(--t-3);padding-top:28px;
}
.crumb a{color:var(--t-2);transition:color .18s ease}
.crumb a:hover{color:var(--t-1)}
.crumb .sep{color:var(--t-3);opacity:.7}
.crumb .cur{color:var(--t-1);max-width:60%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------- hero ---------- */
.page-hero{padding:20px 0 56px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1fr 340px;gap:56px;align-items:end;margin-top:26px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--neon-400);text-transform:uppercase;
  padding:5px 12px;border-radius:999px;
  background:rgba(95,227,192,.10);border:1px solid rgba(95,227,192,.24);
}
h1.page-title{
  margin-top:18px;
  font-size:clamp(30px,4.2vw,52px);
  line-height:1.08;
  letter-spacing:-.02em;
  font-weight:800;
  max-width:16em;
}
.page-sub{
  margin-top:18px;font-size:17px;line-height:1.85;color:var(--t-2);max-width:34em;
}
.hero-facts{display:flex;gap:36px;flex-wrap:wrap;margin-top:32px}
.hero-fact{min-width:96px}
.hero-fact .n{font-family:var(--font-mono);font-size:26px;font-weight:700;color:var(--brass-400);line-height:1.2}
.hero-fact .l{font-size:12px;letter-spacing:.06em;color:var(--t-3);margin-top:4px}
.hero-thumb{
  position:relative;border-radius:var(--r-md);overflow:hidden;
  border:1px solid var(--line);aspect-ratio:4/3;background:var(--ink-800);
}
.hero-thumb img{width:100%;height:100%;object-fit:cover;opacity:.85}
.hero-thumb .cap{
  position:absolute;left:0;right:0;bottom:0;padding:16px;
  background:linear-gradient(180deg,transparent,rgba(11,12,13,.92));
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--neon-300);
}

/* ---------- chips ---------- */
.chip-row{display:flex;flex-wrap:wrap;gap:10px;padding:32px 0 0}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:999px;
  border:1px solid var(--line);color:var(--t-2);
  font-size:13px;letter-spacing:.02em;
  transition:border-color .18s ease,color .18s ease,background .18s ease,transform .18s ease;
}
.chip:hover{border-color:rgba(95,227,192,.55);color:var(--t-1);transform:translateY(-1px)}
.chip[aria-pressed="true"]{
  color:var(--neon-300);border-color:rgba(95,227,192,.6);
  background:rgba(95,227,192,.08);
}
.chip .num{font-family:var(--font-mono);font-size:11.5px;color:var(--brass-400)}
.chip[aria-pressed="true"] .num{color:var(--neon-300)}

/* ---------- section base ---------- */
.section{padding:80px 0}
.section.alt{background:var(--ink-900);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:36px;flex-wrap:wrap}
h2.sec-title{
  font-size:clamp(24px,2.6vw,34px);line-height:1.2;letter-spacing:-.01em;font-weight:700;
}
.sec-desc{margin-top:12px;font-size:15px;color:var(--t-2);max-width:44em}
.text-link{
  display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--t-1);
  border-bottom:1px solid var(--line-strong);padding-bottom:3px;
  transition:border-color .2s ease,color .2s ease;
}
.text-link:hover{border-color:var(--neon-400);color:var(--neon-300)}
.text-link .arw{transition:transform .2s ease}
.text-link:hover .arw{transform:translateX(3px)}

/* ---------- check cards ---------- */
.check-grid{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px;align-items:start;
}
.check-card{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.check-card:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45);box-shadow:var(--shadow-hover)}
.check-media{aspect-ratio:16/9;overflow:hidden;background:var(--ink-700);position:relative}
.check-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.check-card:hover .check-media img{transform:scale(1.03)}
.check-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(11,12,13,.15),rgba(11,12,13,.55));
}
.check-body{padding:22px 24px 24px}
.idx{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--brass-400);
}
.check-body h3{margin-top:10px;font-size:20px;line-height:1.35;font-weight:600}
.check-list{margin-top:16px;display:flex;flex-direction:column;gap:10px}
.check-list li{
  position:relative;padding-left:16px;font-size:14.5px;line-height:1.75;color:var(--t-2);
}
.check-list li::before{
  content:"";position:absolute;left:0;top:.68em;width:6px;height:6px;background:var(--brass-500);border-radius:1px;
}
.card-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:20px;
  font-size:13.5px;color:var(--neon-300);
  border-bottom:1px solid rgba(95,227,192,.28);padding-bottom:2px;
  transition:border-color .2s ease,gap .2s ease;
}
.card-link:hover{border-color:var(--neon-400);gap:10px}

/* ---------- stats ---------- */
.stat-strip{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
  margin-bottom:48px;
}
.stat-cell{background:var(--ink-900);padding:26px 24px}
.stat-cell .n{font-family:var(--font-mono);font-size:32px;font-weight:700;color:var(--neon-400);line-height:1.15}
.stat-cell .l{font-size:12.5px;letter-spacing:.06em;color:var(--t-3);margin-top:6px}

/* ---------- diff table ---------- */
.table-shell{
  border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;background:var(--ink-900);
}
.table-scroll{overflow-x:auto}
table.diff{width:100%;border-collapse:collapse;min-width:720px}
table.diff thead th{
  text-align:left;font-size:12px;letter-spacing:.08em;color:var(--t-3);
  font-weight:600;padding:16px 22px;background:var(--ink-800);
  border-bottom:1px solid var(--line);white-space:nowrap;
}
table.diff td{
  padding:18px 22px;font-size:14.5px;color:var(--t-2);line-height:1.75;
  border-bottom:1px solid var(--line);vertical-align:top;
}
table.diff tbody tr:last-child td{border-bottom:0}
table.diff tbody tr:hover td{background:rgba(95,227,192,.04)}
table.diff td:first-child{color:var(--t-1);font-weight:600;white-space:nowrap}
.tag{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;letter-spacing:.06em;
  background:rgba(95,227,192,.12);color:var(--neon-300);white-space:nowrap;
}
.tag.brass{background:rgba(192,138,75,.14);color:var(--brass-400)}

/* ---------- record list ---------- */
.record-list{border-top:1px solid var(--line)}
.record-row{
  display:grid;grid-template-columns:88px 1fr auto;gap:24px;align-items:center;
  padding:24px 8px;border-bottom:1px solid var(--line);
  transition:background .2s ease,box-shadow .2s ease;
}
.record-row:hover{background:var(--ink-800);box-shadow:inset 2px 0 0 var(--neon-400)}
.record-row .no{font-family:var(--font-mono);font-size:22px;color:var(--brass-400);font-weight:700}
.record-row h3{font-size:17px;font-weight:600;line-height:1.4}
.record-row p{font-size:14px;color:var(--t-2);margin-top:6px}
.record-row .go{font-family:var(--font-mono);font-size:13px;color:var(--t-3);transition:color .2s ease,transform .2s ease}
.record-row:hover .go{color:var(--neon-300);transform:translateX(2px)}

/* ---------- cta ---------- */
.cta-band{
  position:relative;overflow:hidden;border-radius:var(--r-lg);
  background:var(--ink-800);border:1px solid var(--line);
  padding:48px;display:grid;grid-template-columns:1fr auto;gap:36px;align-items:center;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(192,138,75,.16),transparent 62%);
  pointer-events:none;
}
.cta-band::after{
  content:"";position:absolute;right:-40px;top:-40px;width:260px;height:260px;
  background:radial-gradient(circle,rgba(95,227,192,.14),transparent 70%);
  pointer-events:none;
}
.cta-band h2{position:relative;font-size:clamp(22px,2.4vw,30px);line-height:1.25;font-weight:700;letter-spacing:-.01em}
.cta-band p{position:relative;margin-top:12px;font-size:15px;color:var(--t-2);max-width:34em}
.cta-actions{position:relative;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:999px;font-size:14.5px;font-weight:700;
  transition:background .18s ease,color .18s ease,transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--brass-500);color:var(--ink-950)}
.btn-primary:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
  background:transparent;color:var(--t-1);border:1px solid var(--line-strong);
}
.btn-ghost:hover{border-color:var(--neon-400);color:#fff;transform:translateY(-1px)}

/* ---------- footer ---------- */
.site-footer{
  margin-top:0;background:var(--ink-950);
  border-top:1px solid var(--line);position:relative;
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,var(--neon-400),rgba(95,227,192,.15) 40%,transparent);
}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;
  padding:64px 0 44px;
}
.footer-brand{display:flex;align-items:center;gap:10px}
.footer-desc{margin-top:16px;font-size:14px;line-height:1.9;color:var(--t-2);max-width:26em}
.footer-col h4{
  font-size:12px;letter-spacing:.08em;color:var(--t-3);font-weight:600;margin-bottom:16px;
  text-transform:uppercase;
}
.footer-col a,.footer-col li{
  display:block;font-size:14px;color:var(--t-2);padding:6px 0;transition:color .18s ease,transform .18s ease;
}
.footer-col a:hover{color:var(--t-1);transform:translateX(2px)}
.footer-col ul li{line-height:1.7}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding:20px 0 32px;border-top:1px solid var(--line);
  font-size:12px;color:var(--t-3);
}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .wrap{padding:0 24px}
  .hero-grid{grid-template-columns:1fr;gap:32px;align-items:start}
  .hero-thumb{max-width:420px}
  .nav-links{display:none}
  .nav-cta{display:none}
  .burger{display:flex}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:64px 0}
  .cta-band{padding:36px;grid-template-columns:1fr}
}
@media (max-width:768px){
  .check-grid{grid-template-columns:1fr}
  .stat-strip{grid-template-columns:1fr}
  .record-row{grid-template-columns:56px 1fr;gap:16px}
  .record-row .go{display:none}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding:48px 0 32px}
  .section{padding:56px 0}
  .head-row{margin-bottom:26px}
}
@media (max-width:520px){
  .wrap{padding:0 16px}
  body{font-size:15.5px}
  .page-hero{padding:12px 0 40px}
  .hero-facts{gap:20px}
  .hero-thumb{max-width:100%}
  .crcrumb .cur{max-width:100%}
  .cta-band{padding:26px 22px}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .check-body{padding:20px}
  .footer-bottom{font-size:11.5px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* roulang page: article */
:root{
  --ink-950:#0B0C0D; --ink-900:#101113; --ink-800:#17191C; --ink-700:#22252A; --ink-600:#2E3238;
  --sand-50:#F5F2EC; --sand-100:#EAE4D9; --sand-200:#DCD5C7;
  --brass-500:#C08A4B; --brass-400:#D9A263; --brass-600:#A2703A;
  --neon-400:#5FE3C0; --neon-300:#8BF0D6;
  --text:#F2F0EC; --text-2:#A5A8AE; --text-3:#6E7278;
  --line:rgba(255,255,255,.08);
  --line-soft:rgba(255,255,255,.05);
  --r-xl:26px; --r-lg:18px; --r-md:14px; --r-sm:12px;
  --shadow:0 18px 40px rgba(0,0,0,.45);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,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;padding:0;background:var(--ink-950);color:var(--text);
  font-family:var(--font-sans);font-size:16px;line-height:1.9;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--neon-400);outline-offset:3px;border-radius:8px}
::selection{background:rgba(95,227,192,.28);color:#fff}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-scroll{overflow:hidden}
.skip{position:absolute;left:-9999px;top:0;background:var(--brass-500);color:#111;padding:10px 16px;border-radius:10px;z-index:200}
.skip:focus{left:16px;top:16px}
.wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 32px}

/* ---------- 顶栏 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(11,12,13,.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line-soft)}
.site-header::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:linear-gradient(90deg,transparent,rgba(95,227,192,.5),transparent);pointer-events:none}
.nav-inner{display:flex;align-items:center;gap:26px;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:-.01em;color:#fff;white-space:nowrap}
.brand-mark{font-family:var(--font-mono);font-size:15px;color:var(--brass-400);display:inline-flex;align-items:center;gap:2px;line-height:1}
.brand-dot{width:6px;height:6px;border-radius:50%;background:var(--neon-400);box-shadow:0 0 10px rgba(95,227,192,.9);display:inline-block;margin:0 1px}
.nav-links{display:flex;align-items:center;gap:24px}
.nav-link{position:relative;font-size:13.5px;color:var(--text-2);padding:8px 0;transition:color .2s var(--ease);white-space:nowrap}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;border-radius:2px;background:var(--neon-400);box-shadow:0 0 10px rgba(95,227,192,.7);transform:scaleX(0);transform-origin:left;transition:transform .24s var(--ease)}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:#fff}
.nav-link.active::after{transform:scaleX(1)}
.nav-link.active::before{content:"";position:absolute;left:-12px;top:50%;width:6px;height:6px;border-radius:50%;background:var(--neon-400);box-shadow:0 0 10px rgba(95,227,192,.9);transform:translateY(-50%)}
.nav-cta{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:999px;background:var(--brass-500);color:#141310;font-size:13.5px;font-weight:700;letter-spacing:.01em;transition:all .2s var(--ease);white-space:nowrap}
.nav-cta:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
.burger{display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--line);align-items:center;justify-content:center;margin-left:auto}
.burger span,.burger span::before,.burger span::after{display:block;width:18px;height:2px;border-radius:2px;background:var(--text);position:relative;transition:transform .2s var(--ease)}
.burger span::before,.burger span::after{content:"";position:absolute;left:0}
.burger span::before{top:-6px}
.burger span::after{top:6px}

/* ---------- 移动端抽屉 ---------- */
.mobile-drawer{position:fixed;inset:0;z-index:90;background:var(--ink-950);padding:18px 22px 24px;display:flex;flex-direction:column;transform:translateY(-100%);opacity:0;visibility:hidden;transition:transform .32s var(--ease),opacity .32s var(--ease),visibility .32s}
.mobile-drawer.open{transform:none;opacity:1;visibility:visible}
.drawer-top{display:flex;align-items:center;justify-content:space-between;padding-bottom:16px;border-bottom:1px solid var(--line);margin-bottom:14px}
.drawer-close{width:44px;height:44px;border-radius:12px;border:1px solid var(--line);color:var(--text);font-size:22px;line-height:1;display:flex;align-items:center;justify-content:center}
.drawer-close:hover{border-color:var(--neon-400);color:#fff}
.drawer-nav{display:flex;flex-direction:column;gap:2px;flex:1;padding-top:4px}
.drawer-nav a{padding:15px 14px;font-size:19px;color:var(--text);border-left:2px solid transparent;border-radius:10px;transition:all .2s var(--ease)}
.drawer-nav a:hover,.drawer-nav a:focus-visible{background:rgba(255,255,255,.04);border-left-color:var(--neon-400)}
.drawer-cta{margin-top:18px;width:100%;height:48px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:999px;font-size:14px;font-weight:600;letter-spacing:.01em;white-space:nowrap;border:1px solid transparent;transition:all .2s var(--ease)}
.btn-primary{background:var(--brass-500);color:#141310}
.btn-primary:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{border-color:rgba(255,255,255,.18);color:var(--text)}
.btn-ghost:hover{border-color:var(--neon-400);color:#fff;box-shadow:0 0 0 3px rgba(95,227,192,.12)}
.btn-link{height:auto;padding:0 0 2px;border-radius:0;color:var(--text-2);font-size:14px;border-bottom:1px solid rgba(255,255,255,.25)}
.btn-link:hover{color:#fff;border-bottom-color:var(--neon-400)}
.badge{display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;border-radius:999px;background:rgba(95,227,192,.12);color:var(--neon-300);font-size:12px;letter-spacing:.06em;font-weight:600}
.badge-brass{background:transparent;border:1px solid rgba(192,138,75,.5);color:var(--brass-400)}

/* ---------- 文章首屏 ---------- */
.article-hero{position:relative;overflow:hidden;padding:40px 0 8px}
.article-hero::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-2.webp') center/cover no-repeat;opacity:.10;filter:grayscale(.35);pointer-events:none}
.article-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,12,13,.5),var(--ink-950));pointer-events:none}
.article-hero .wrap{position:relative;z-index:1}
.crumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--text-3);margin-bottom:26px}
.crumbs a{transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--neon-300)}
.crumbs .sep{opacity:.55}
.crumbs .current{color:var(--text-2);max-width:min(100%,440px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hero-tag-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:18px}
.hero-code{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--text-3)}
.article-title{font-size:clamp(30px,3.8vw,46px);line-height:1.16;font-weight:800;letter-spacing:-.02em;color:#fff;max-width:900px}
.meta-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:20px;font-family:var(--font-mono);font-size:12.5px;color:var(--text-3);letter-spacing:.02em}
.meta-row .dot{opacity:.5}
.lead{margin-top:24px;max-width:780px;font-size:17px;line-height:1.95;color:var(--sand-200);padding-left:18px;border-left:3px solid var(--brass-500)}

/* ---------- 封面 ---------- */
.cover-zone{padding:40px 0 0}
.cover-figure{max-width:1120px;margin:0 auto;padding:0 32px}
.cover-frame{position:relative;border-radius:var(--r-md);overflow:hidden;border:1px solid var(--line);background:var(--ink-800);aspect-ratio:16/9}
.cover-frame img{width:100%;height:100%;object-fit:cover}
.cover-frame::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,12,13,0) 55%,rgba(11,12,13,.55));pointer-events:none}
.cover-cap{margin-top:12px;font-size:12px;color:var(--text-3);letter-spacing:.02em}
.cover-cap .mono{color:var(--text-2)}

/* ---------- 文章布局 ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,760px) 240px;gap:56px;justify-content:center;max-width:1120px;margin:0 auto;padding:56px 32px 0}
.article-card{min-width:0}
.article-body{font-size:17px;line-height:1.95;color:#DCDDE0;overflow-wrap:break-word}
.article-body > *:first-child{margin-top:0}
.article-body p{margin:0 0 20px}
.article-body h2{counter-increment:sec;position:relative;margin:48px 0 18px;font-size:27px;line-height:1.35;font-weight:700;color:#fff;letter-spacing:-.01em}
.article-body{counter-reset:sec}
.article-body h2::before{content:"[" counter(sec,decimal-leading-zero) "]";display:inline-block;font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--brass-400);margin-right:10px;vertical-align:2px}
.article-body h3{margin:34px 0 14px;font-size:21px;line-height:1.45;font-weight:600;color:#fff}
.article-body h4{margin:26px 0 12px;font-size:17px;font-weight:600;color:var(--sand-100)}
.article-body ul,.article-body ol{margin:0 0 22px;padding-left:22px}
.article-body ul{list-style:square}
.article-body ol{list-style:decimal}
.article-body li{margin:8px 0;padding-left:4px}
.article-body ul li::marker{color:var(--brass-500)}
.article-body ol li::marker{color:var(--brass-400);font-family:var(--font-mono)}
.article-body a{color:var(--neon-300);border-bottom:1px solid rgba(95,227,192,.45);transition:all .18s var(--ease)}
.article-body a:hover{color:#fff;border-bottom-color:var(--neon-300)}
.article-body strong{color:#fff;font-weight:700}
.article-body blockquote{margin:28px 0;padding:24px 26px;background:var(--sand-50);color:#1A1B1E;border-left:3px solid var(--brass-500);border-radius:var(--r-sm);font-size:16.5px;line-height:1.9}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--r-md);margin:26px 0;border:1px solid var(--line)}
.article-body figure{margin:26px 0}
.article-body figcaption{font-size:12.5px;color:var(--text-3);margin-top:10px;text-align:center}
.article-body hr{border:0;height:1px;background:var(--line);margin:36px 0}
.article-body table{width:100%;border-collapse:collapse;margin:26px 0;font-size:14.5px;display:block;overflow-x:auto;white-space:nowrap}
.article-body th,.article-body td{border:1px solid var(--line);padding:12px 14px;text-align:left}
.article-body th{background:var(--ink-800);color:#fff;font-weight:600}
.article-body td{color:var(--text-2)}
.article-body pre{background:var(--ink-900);border:1px solid var(--line);border-radius:var(--r-sm);padding:18px 20px;overflow-x:auto;font-family:var(--font-mono);font-size:13.5px;line-height:1.8;color:var(--sand-100)}
.article-body code{font-family:var(--font-mono);font-size:.92em;background:rgba(255,255,255,.06);padding:2px 6px;border-radius:6px;color:var(--neon-300)}
.article-body pre code{background:none;padding:0;color:inherit}

/* ---------- 文末 ---------- */
.article-foot{margin-top:44px;padding-top:26px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.tags{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tag{display:inline-flex;align-items:center;height:30px;padding:0 14px;border-radius:999px;border:1px solid var(--line);font-size:12.5px;color:var(--text-2);transition:all .2s var(--ease)}
.tag:hover{border-color:var(--neon-400);color:#fff;background:rgba(95,227,192,.08)}
.foot-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}

/* ---------- 相关推荐 ---------- */
.related{margin-top:56px}
.related-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:20px}
.related-head h2{font-size:22px;font-weight:700;color:#fff;letter-spacing:-.01em}
.related-head .muted{font-size:12px;color:var(--text-3);letter-spacing:.08em}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.rel-card{display:block;background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;transition:all .24s var(--ease)}
.rel-card:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45);box-shadow:var(--shadow)}
.rel-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--ink-700)}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.rel-card:hover .rel-thumb img{transform:scale(1.04)}
.rel-body{padding:16px 18px 18px}
.rel-num{font-size:11px;letter-spacing:.12em;color:var(--brass-400)}
.rel-body h3{margin:8px 0 8px;font-size:16px;font-weight:600;line-height:1.5;color:#fff;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rel-body p{font-size:13px;line-height:1.8;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rel-date{display:inline-block;margin-top:12px;font-size:11.5px;color:var(--text-3);letter-spacing:.04em}

/* ---------- 目录 ---------- */
.toc-wrap{position:sticky;top:96px;align-self:start}
.toc-toggle{display:none}
.toc-panel{border-left:1px solid var(--line);padding-left:18px}
.toc-title{font-size:11px;letter-spacing:.14em;color:var(--text-3);margin-bottom:14px}
.toc a{display:block;font-size:13.5px;line-height:1.6;color:var(--text-2);padding:8px 0;border-bottom:1px solid rgba(255,255,255,.04);transition:all .18s var(--ease)}
.toc a:hover{color:#fff;padding-left:4px}
.toc a.active{color:var(--neon-300);font-weight:600;padding-left:4px}
.toc a.lvl3{padding-left:14px;font-size:12.5px;color:var(--text-3)}
.toc a.lvl3:hover,.toc a.lvl3.active{padding-left:18px}

/* ---------- 空态 ---------- */
.empty-state{margin:20px 0 0;border:1px dashed rgba(255,255,255,.18);border-radius:var(--r-lg);padding:48px 28px;text-align:center;min-height:200px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px}
.empty-state .empty-title{font-size:20px;font-weight:700;color:#fff}
.empty-state .empty-desc{font-size:14px;color:var(--text-3);max-width:420px}

/* ---------- CTA ---------- */
.cta-band{padding:80px 0 0}
.cta-box{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r-xl);padding:44px 44px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;background:var(--ink-900)}
.cta-box::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-3.webp') center/cover no-repeat;opacity:.08;pointer-events:none}
.cta-box::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,rgba(192,138,75,.16),transparent 58%);pointer-events:none}
.cta-text{position:relative;z-index:1;max-width:520px}
.cta-text h2{font-size:clamp(22px,2.6vw,30px);line-height:1.3;font-weight:700;color:#fff;letter-spacing:-.01em}
.cta-text p{margin-top:12px;font-size:14.5px;color:var(--text-2);line-height:1.85}
.cta-actions{position:relative;z-index:1;display:flex;align-items:center;gap:14px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;margin-top:80px;background:var(--ink-950);border-top:1px solid var(--line-soft);padding-top:56px}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(95,227,192,.5),transparent)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;color:#fff;margin-bottom:14px}
.footer-desc{font-size:13.5px;line-height:1.9;color:var(--text-3);max-width:320px}
.footer-col h4{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;font-weight:600;color:var(--text-3);margin-bottom:16px}
.footer-col a,.footer-col li{display:block;font-size:14px;color:var(--text-2);margin-bottom:11px;transition:all .18s var(--ease)}
.footer-col a:hover{color:#fff;transform:translateX(2px)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line-soft);padding:20px 0;font-size:12px;color:var(--text-3)}

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  .nav-links{gap:18px}
  .nav-link{font-size:13px}
  .article-layout{grid-template-columns:minmax(0,1fr) 220px;gap:36px}
}
@media (max-width:1023px){
  .article-layout{grid-template-columns:minmax(0,1fr);gap:28px;padding-top:40px}
  .toc-wrap{order:-1;position:static}
  .toc-toggle{display:flex;width:100%;align-items:center;justify-content:space-between;height:50px;padding:0 16px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--ink-800);color:var(--text);font-size:14px}
  .toc-toggle:hover{border-color:rgba(95,227,192,.4)}
  .toc-count{font-size:12px;color:var(--text-3)}
  .toc-panel{display:none;margin-top:12px;border:1px solid var(--line);border-radius:var(--r-sm);padding:16px 18px;border-left:1px solid var(--line)}
  .toc-panel.open{display:block}
  .toc-title{display:none}
  .toc a{border-bottom:0;padding:7px 0}
  .toc a:hover,.toc a.active{padding-left:6px}
  .toc a.lvl3{padding-left:16px}
  .related-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:900px){
  .nav-links,.nav-cta{display:none}
  .burger{display:flex}
  .nav-inner{min-height:60px}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cta-box{padding:36px 28px}
}
@media (max-width:767px){
  .wrap{padding:0 20px}
  .article-hero{padding-top:28px}
  .cover-figure{padding:0 20px}
  .article-layout{padding:32px 20px 0}
  .article-body{font-size:16px;line-height:1.92}
  .article-body h2{font-size:22px;margin-top:38px}
  .article-body h3{font-size:18.5px}
  .lead{font-size:15.5px}
  .article-foot{flex-direction:column;align-items:flex-start}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1 1 auto}
  .site-footer{padding-top:44px;margin-top:56px}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px}
  .related{margin-top:44px}
  .cta-band{padding-top:56px}
}
@media (max-width:520px){
  .article-title{font-size:28px}
  .related-grid{grid-template-columns:1fr}
  .meta-row{font-size:11.5px;gap:8px}
  .badge{height:24px;font-size:11.5px;padding:0 10px}
  .cover-cap{font-size:11.5px}
  .cta-actions .btn{width:100%;flex:1 1 100%}
  .cta-actions .btn-link{width:auto;flex:0 0 auto}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
}

/* roulang page: category3 */
:root{
    --ink-950:#0B0C0D; --ink-900:#101113; --ink-800:#17191C; --ink-700:#22252A; --ink-600:#2E3238;
    --sand-50:#F5F2EC; --sand-100:#EAE4D9; --sand-200:#DCD5C7;
    --brass-500:#C08A4B; --brass-400:#D9A263; --brass-600:#A2703A;
    --neon-400:#5FE3C0; --neon-300:#8BF0D6;
    --t-main:#F2F0EC; --t-sub:#A5A8AE; --t-weak:#6E7278;
    --line:rgba(255,255,255,.08);
    --line-strong:rgba(255,255,255,.18);
    --r-xl:26px; --r-lg:18px; --r-md:14px; --r-pill:999px;
    --shadow-hover:0 18px 40px rgba(0,0,0,.45);
    --font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
    --font-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  }
  *,*::before,*::after{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--ink-950);
    color:var(--t-main);
    font-family:var(--font-sans);
    font-size:16px;
    line-height:1.9;
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
  }
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none}
  button{font-family:inherit}
  h1,h2,h3,h4,p,ul,ol,figure{margin:0}
  ul,ol{padding:0;list-style:none}
  ::selection{background:rgba(95,227,192,.25);color:#fff}
  :focus-visible{outline:2px solid var(--neon-400);outline-offset:2px}

  .wrap{max-width:1240px;margin:0 auto;padding:0 32px}
  .mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

  /* ---------- header ---------- */
  .site-header{
    position:sticky;top:0;z-index:80;
    background:rgba(11,12,13,.88);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
  }
  .site-header::after{
    content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
    background:linear-gradient(90deg,var(--neon-400),rgba(95,227,192,.18) 40%,transparent 78%);
  }
  .nav-inner{display:flex;align-items:center;gap:26px;height:64px}

  .brand{display:inline-flex;align-items:center;gap:9px;flex-shrink:0}
  .brand-mark{font-family:var(--font-mono);font-size:17px;color:var(--neon-400);letter-spacing:-1px;line-height:1}
  .brand-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--neon-400);box-shadow:0 0 10px var(--neon-400);vertical-align:middle;margin:0 1px}
  .brand-text{font-size:16px;font-weight:800;letter-spacing:-.01em;color:var(--t-main)}

  .nav-links{display:flex;align-items:center;gap:24px;margin:0 auto}
  .nav-link{
    position:relative;font-size:13.5px;color:var(--t-sub);padding:6px 0;
    transition:color .18s ease;white-space:nowrap;
  }
  .nav-link::after{
    content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;
    background:var(--neon-400);opacity:0;transform:scaleX(.4);transform-origin:left;
    transition:opacity .2s ease,transform .2s ease;
    box-shadow:0 0 10px rgba(95,227,192,.65);
  }
  .nav-link:hover{color:var(--t-main)}
  .nav-link:hover::after{opacity:.7;transform:scaleX(1)}
  .nav-link.active{color:var(--t-main);font-weight:600}
  .nav-link.active::after{opacity:1;transform:scaleX(1)}
  .nav-link.active::before{
    content:"";position:absolute;left:-12px;top:50%;width:6px;height:6px;margin-top:-3px;
    border-radius:50%;background:var(--neon-400);box-shadow:0 0 8px var(--neon-400);
  }

  .nav-cta{
    flex-shrink:0;background:var(--brass-500);color:var(--ink-950);
    font-size:13.5px;font-weight:700;padding:9px 18px;border-radius:var(--r-pill);
    transition:background .18s ease,transform .18s ease,box-shadow .18s ease;
  }
  .nav-cta:hover{background:var(--brass-400);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(192,138,75,.18)}
  .nav-cta:active{transform:translateY(0)}

  .burger{
    display:none;align-items:center;justify-content:center;width:44px;height:44px;
    margin-left:auto;background:transparent;border:1px solid var(--line);border-radius:12px;
    cursor:pointer;transition:border-color .18s ease;
  }
  .burger:hover{border-color:var(--line-strong)}
  .burger span{display:block;position:relative;width:18px;height:2px;background:var(--t-main);transition:background .18s ease}
  .burger span::before,.burger span::after{
    content:"";position:absolute;left:0;width:18px;height:2px;background:var(--t-main);
    transition:transform .2s ease,top .2s ease;
  }
  .burger span::before{top:-6px}
  .burger span::after{top:6px}
  .menu-open .burger span{background:transparent}
  .menu-open .burger span::before{top:0;transform:rotate(45deg)}
  .menu-open .burger span::after{top:0;transform:rotate(-45deg)}

  /* ---------- hero ---------- */
  .page-hero{
    padding:48px 0 64px;
    border-bottom:1px solid var(--line);
    background:
      radial-gradient(110% 80% at 10% -10%, rgba(95,227,192,.07), transparent 58%),
      radial-gradient(80% 70% at 92% 0%, rgba(192,138,75,.08), transparent 62%),
      var(--ink-950);
  }
  .crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--t-weak);margin-bottom:28px;flex-wrap:wrap}
  .crumbs a{transition:color .18s ease}
  .crumbs a:hover{color:var(--neon-400)}
  .crumbs .sep{color:var(--t-weak)}
  .crumbs .current{color:var(--t-sub);max-width:56vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

  .hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:56px;align-items:center;max-width:1120px}
  .eyebrow{
    display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
    color:var(--neon-400);background:rgba(95,227,192,.1);
    border:1px solid rgba(95,227,192,.22);padding:5px 13px;border-radius:var(--r-pill);
  }
  .page-hero h1{
    font-size:clamp(30px,4.2vw,48px);
    line-height:1.1;letter-spacing:-.02em;font-weight:800;
    margin:20px 0 18px;max-width:19ch;
  }
  .hero-lead{font-size:16.5px;line-height:1.85;color:var(--t-sub);max-width:620px}
  .hero-thumb{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);position:relative}
  .hero-thumb img{width:100%;aspect-ratio:4/3;object-fit:cover}
  .hero-thumb::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(11,12,13,0) 40%,rgba(11,12,13,.72));
  }

  .hero-stats{display:flex;margin-top:44px;padding-top:24px;border-top:1px solid var(--line);max-width:1120px}
  .hero-stats li{flex:1;padding-right:24px}
  .hero-stats li + li{border-left:1px solid var(--line);padding-left:24px}
  .hero-stats .num{display:block;font-family:var(--font-mono);font-size:28px;font-weight:700;color:var(--brass-400);letter-spacing:-.02em;line-height:1.3}
  .hero-stats .lab{font-size:12px;letter-spacing:.08em;color:var(--t-weak)}

  /* ---------- common section ---------- */
  .section{padding:96px 0}
  .section-head{max-width:720px;margin-bottom:40px}
  .section-head h2{font-size:clamp(24px,2.6vw,32px);line-height:1.2;letter-spacing:-.01em;font-weight:700}
  .section-head p{margin-top:12px;font-size:15px;color:var(--t-sub)}

  /* ---------- faq layout ---------- */
  .faq-layout{display:grid;grid-template-columns:340px minmax(0,1fr);gap:56px;align-items:start}
  .faq-side{position:sticky;top:88px}
  .side-card{
    background:var(--ink-800);border:1px solid var(--line);
    border-radius:var(--r-lg);padding:24px;
  }
  .side-card h2{font-size:19px;font-weight:700;line-height:1.35;margin-top:12px}
  .side-card .side-note{font-size:14px;line-height:1.85;color:var(--t-sub);margin-top:10px}
  .micro{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--brass-400)}

  .search-box{
    display:flex;align-items:center;gap:6px;height:46px;margin:20px 0 18px;
    background:var(--ink-900);border:1px solid var(--ink-600);border-radius:12px;
    padding:4px 4px 4px 14px;transition:border-color .18s ease,box-shadow .18s ease;
  }
  .search-box:focus-within{border-color:var(--neon-400);box-shadow:0 0 0 3px rgba(95,227,192,.16)}
  .search-box input{
    flex:1;min-width:0;background:transparent;border:0;outline:none;
    color:var(--t-main);font-size:14px;font-family:inherit;
  }
  .search-box input::placeholder{color:var(--t-weak)}
  .search-box button{
    flex-shrink:0;height:36px;padding:0 16px;border:0;border-radius:var(--r-pill);
    background:var(--brass-500);color:var(--ink-950);font-size:13px;font-weight:700;
    cursor:pointer;transition:background .18s ease;
  }
  .search-box button:hover{background:var(--brass-400)}

  .side-index{display:grid;gap:2px;margin-top:6px}
  .side-index a{
    display:flex;align-items:center;gap:12px;padding:9px 10px;border-radius:10px;
    font-size:14px;color:var(--t-sub);transition:background .18s ease,color .18s ease;
  }
  .side-index a:hover{background:var(--ink-700);color:var(--t-main)}
  .side-index .idx{font-family:var(--font-mono);font-size:12px;color:var(--brass-400);letter-spacing:.06em}

  .side-figure{margin-top:20px;border-radius:var(--r-md);overflow:hidden;border:1px solid var(--line)}
  .side-figure img{width:100%;aspect-ratio:4/3;object-fit:cover}

  .faq-group + .faq-group{margin-top:48px}
  .faq-group{scroll-margin-top:88px}
  .group-title{
    display:flex;align-items:center;gap:12px;
    font-size:20px;font-weight:700;line-height:1.35;margin-bottom:6px;
  }
  .group-title .tag{
    font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--brass-400);
    border:1px solid rgba(192,138,75,.4);padding:2px 9px;border-radius:var(--r-pill);
  }
  .group-sub{font-size:14px;color:var(--t-weak);margin-bottom:15px}

  .faq-list{border-top:1px solid var(--line)}
  .faq-item{border-bottom:1px solid var(--line)}
  .faq-item summary{
    position:relative;cursor:pointer;list-style:none;
    padding:20px 48px 20px 0;font-size:16px;font-weight:600;line-height:1.6;
    color:var(--t-main);transition:color .18s ease;
  }
  .faq-item summary::-webkit-details-marker{display:none}
  .faq-item summary:hover{color:var(--neon-300)}
  .faq-item summary::after{
    content:"+";position:absolute;right:6px;top:19px;
    width:24px;height:24px;line-height:22px;text-align:center;
    font-family:var(--font-mono);font-size:15px;color:var(--t-sub);
    border:1px solid var(--line);border-radius:50%;
    transition:transform .22s ease,color .18s ease,border-color .18s ease;
  }
  .faq-item[open] summary{color:var(--t-main)}
  .faq-item[open] summary::after{transform:rotate(45deg);color:var(--neon-400);border-color:rgba(95,227,192,.45)}
  .faq-a{padding:0 44px 22px 0;font-size:15px;line-height:1.88;color:var(--t-sub)}
  .faq-a p + p{margin-top:12px}
  .faq-a strong{color:var(--sand-100);font-weight:600}

  /* ---------- diff cards ---------- */
  .diff-band{background:var(--ink-900);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  .diff-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:36px}
  .diff-card{
    background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-lg);
    padding:26px 24px;transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
  }
  .diff-card:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45);box-shadow:var(--shadow-hover)}
  .diff-card .dnum{font-family:var(--font-mono);font-size:34px;font-weight:700;color:var(--brass-400);line-height:1.1;letter-spacing:-.02em}
  .diff-card h3{font-size:18px;font-weight:700;margin:14px 0 8px}
  .diff-card p{font-size:14.5px;line-height:1.85;color:var(--t-sub)}

  /* ---------- unsolved ---------- */
  .unsolved{
    max-width:720px;margin:0 auto;
    background:var(--sand-50);color:#16171A;
    border-radius:var(--r-xl);padding:38px 40px;
    box-shadow:0 8px 24px rgba(20,20,24,.06);
  }
  .unsolved .micro{color:var(--brass-600)}
  .unsolved h2{font-size:clamp(22px,2.4vw,28px);line-height:1.25;letter-spacing:-.01em;font-weight:800;margin-top:12px;color:#16171A}
  .unsolved p{margin-top:12px;font-size:15px;line-height:1.85;color:#5C6067}
  .btn-row{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:24px}
  .btn-primary{
    display:inline-flex;align-items:center;gap:8px;
    background:var(--ink-950);color:var(--sand-50);
    font-size:14px;font-weight:700;padding:12px 24px;border-radius:var(--r-pill);
    transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
  }
  .btn-primary:hover{transform:translateY(-1px);background:var(--ink-800);box-shadow:0 0 0 3px rgba(11,12,13,.12)}
  .link-arrow{
    display:inline-flex;align-items:center;gap:6px;font-size:14px;color:#3B3F45;
    border-bottom:1px solid rgba(59,63,69,.35);padding-bottom:2px;
    transition:color .18s ease,border-color .18s ease;
  }
  .link-arrow:hover{color:#16171A;border-color:#16171A}

  /* ---------- link cards ---------- */
  .link-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
  .link-card{
    display:flex;flex-direction:column;
    background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-lg);
    padding:26px 24px;min-height:186px;
    transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
  }
  .link-card:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45);box-shadow:var(--shadow-hover)}
  .link-card .idx{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--brass-400)}
  .link-card h3{font-size:18px;font-weight:700;margin:12px 0 8px;line-height:1.4}
  .link-card p{font-size:14.5px;line-height:1.85;color:var(--t-sub)}
  .link-card .go{margin-top:auto;padding-top:18px;font-family:var(--font-mono);font-size:13px;color:var(--neon-400)}

  /* ---------- footer ---------- */
  .site-footer{position:relative;margin-top:96px;background:var(--ink-950);border-top:1px solid var(--line)}
  .site-footer::before{
    content:"";position:absolute;left:0;right:0;top:-1px;height:1px;
    background:linear-gradient(90deg,var(--neon-400),rgba(95,227,192,.2) 45%,transparent 80%);
  }
  .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding:64px 0 40px}
  .footer-brand{display:flex;align-items:center;gap:9px;margin-bottom:14px}
  .footer-desc{font-size:14px;line-height:1.85;color:var(--t-sub);max-width:320px}
  .footer-col h4{font-size:12px;letter-spacing:.08em;color:var(--t-weak);font-weight:600;margin-bottom:14px}
  .footer-col a{display:block;font-size:14px;color:var(--t-sub);padding:6px 0;transition:color .18s ease,transform .18s ease}
  .footer-col a:hover{color:#fff;transform:translateX(2px)}
  .footer-col ul{font-size:14px;line-height:2;color:var(--t-sub)}
  .footer-bottom{
    display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;
    border-top:1px solid var(--line);padding:18px 0 22px;font-size:12px;color:var(--t-weak);
  }

  /* ---------- responsive ---------- */
  @media (max-width:1023px){
    .wrap{padding:0 20px}
    .nav-links{
      position:fixed;left:0;right:0;top:56px;bottom:0;z-index:70;
      display:flex;flex-direction:column;align-items:stretch;gap:0;
      margin:0;padding:20px 20px 40px;
      background:rgba(11,12,13,.98);
      -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
      opacity:0;pointer-events:none;transform:translateY(-8px);
      transition:opacity .22s ease,transform .22s ease;
      overflow-y:auto;
    }
    .menu-open .nav-links{opacity:1;pointer-events:auto;transform:none}
    .nav-link{font-size:20px;padding:16px 14px;border-left:2px solid transparent}
    .nav-link::after{display:none}
    .nav-link.active{background:rgba(95,227,192,.06);border-left-color:var(--neon-400)}
    .nav-link.active::before{display:none}
    .nav-cta{display:none}
    .burger{display:flex}
    .nav-inner{height:56px}
    .page-hero{padding:36px 0 48px}
    .hero-grid{grid-template-columns:1fr;gap:32px}
    .hero-thumb{display:none}
    .page-hero h1{max-width:100%}
    .section{padding:64px 0}
    .faq-layout{grid-template-columns:1fr;gap:36px}
    .faq-side{position:static}
    .diff-grid{grid-template-columns:1fr}
    .link-cards{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px;padding:48px 0 32px}
    .site-footer{margin-top:72px}
  }
  @media (max-width:639px){
    .wrap{padding:0 16px}
    .page-hero{padding:28px 0 40px}
    .section{padding:56px 0}
    .hero-stats{margin-top:32px}
    .hero-stats li{padding-right:12px}
    .hero-stats li + li{padding-left:12px}
    .hero-stats .num{font-size:22px}
    .hero-stats .lab{font-size:11px;letter-spacing:.04em}
    .side-card{padding:20px}
    .faq-item summary{font-size:15px;padding-right:42px}
    .faq-a{padding-right:8px;font-size:14.5px}
    .unsolved{padding:26px 22px;border-radius:20px}
    .btn-primary{width:100%;justify-content:center}
    .footer-grid{grid-template-columns:1fr}
    .footer-bottom{flex-direction:column;align-items:flex-start}
    .crumbs .current{max-width:70vw}
  }
  @media (prefers-reduced-motion:reduce){
    *,*::before,*::after{transition:none !important;animation:none !important}
    html{scroll-behavior:auto}
  }

/* roulang page: category4 */
:root{
  --ink-950:#0B0C0D; --ink-900:#101113; --ink-800:#17191C; --ink-700:#22252A; --ink-600:#2E3238;
  --sand-50:#F5F2EC; --sand-100:#EAE4D9; --sand-200:#DCD5C7;
  --brass-500:#C08A4B; --brass-400:#D9A263; --brass-600:#A2703A;
  --neon-400:#5FE3C0; --neon-300:#8BF0D6;
  --t1:#F2F0EC; --t2:#A5A8AE; --t3:#6E7278;
  --d1:#16171A; --d2:#5C6067; --d3:#8A8D93;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --r-xl:26px; --r-lg:18px; --r-md:14px; --r-sm:12px;
  --shadow-deep:0 18px 40px rgba(0,0,0,.45);
  --shadow-soft:0 8px 24px rgba(20,20,24,.06);
  --ease:cubic-bezier(.22,.61,.36,1);
  --sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--ink-950);color:var(--t1);
  font-family:var(--sans);font-size:16px;line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
input{font-family:inherit;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;padding:0;}
ul,ol{list-style:none;}
::selection{background:rgba(95,227,192,.28);color:#fff;}
:focus-visible{outline:2px solid var(--neon-400);outline-offset:2px;border-radius:6px;}
.wrap{max-width:1240px;margin:0 auto;padding:0 32px;}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:0;}

/* ============ 顶栏 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(11,12,13,.88);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(95,227,192,.55),transparent);
  opacity:.7;pointer-events:none;
}
.nav-inner{display:flex;align-items:center;gap:26px;height:64px;}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  font-family:var(--mono);font-size:16px;line-height:1;color:var(--neon-400);
  display:inline-flex;align-items:center;gap:1px;
}
.brand-dot{
  display:inline-block;width:6px;height:6px;border-radius:999px;background:var(--neon-400);
  box-shadow:0 0 10px rgba(95,227,192,.9);margin:0 1px;
}
.brand-text{font-size:17px;font-weight:800;letter-spacing:-.01em;color:var(--t1);white-space:nowrap;}
.nav-links{display:flex;align-items:center;gap:20px;margin-left:auto;}
.nav-link{
  position:relative;font-size:13.5px;color:var(--t2);padding:6px 2px;
  transition:color .2s var(--ease);white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;
  background:var(--neon-400);box-shadow:0 0 10px rgba(95,227,192,.7);
  transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--t1);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.active{color:var(--t1);font-weight:600;padding-left:14px;}
.nav-link.active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:6px;height:6px;border-radius:999px;background:var(--neon-400);
  box-shadow:0 0 8px rgba(95,227,192,.85);
}
.nav-link.active::after{transform:scaleX(1);}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  height:38px;padding:0 18px;border-radius:999px;
  background:var(--brass-500);color:var(--ink-950);
  font-size:13.5px;font-weight:700;letter-spacing:.01em;white-space:nowrap;
  transition:background .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.nav-cta:hover{
  background:var(--brass-400);transform:translateY(-1px);
  box-shadow:0 0 0 3px rgba(192,138,75,.18);
}
.nav-cta:active{transform:translateY(0);}
.burger{
  display:none;width:44px;height:44px;border-radius:10px;
  border:1px solid var(--line);align-items:center;justify-content:center;
  transition:border-color .2s var(--ease);
}
.burger:hover{border-color:rgba(95,227,192,.55);}
.burger span{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--t1);}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--t1);
  transition:transform .24s var(--ease);
}
.burger span::before{top:-6px;}
.burger span::after{top:6px;}

/* ============ 页头 ============ */
.page-head{padding:56px 0 40px;position:relative;overflow:hidden;}
.page-head::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(680px 320px at 12% 0%,rgba(95,227,192,.10),transparent 68%),
    radial-gradient(560px 300px at 88% 10%,rgba(192,138,75,.12),transparent 70%);
}
.page-head .wrap{position:relative;z-index:1;}
.crumbs{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13px;color:var(--t3);margin-bottom:24px;
}
.crumbs a{color:var(--t2);transition:color .2s var(--ease);}
.crumbs a:hover{color:var(--neon-300);}
.crumbs .sep{color:var(--ink-600);}
.crumbs .now{color:var(--t1);max-width:60vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.head-grid{display:grid;grid-template-columns:1fr 320px;gap:56px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--neon-300);margin-bottom:18px;
}
.eyebrow .bar{display:inline-block;width:26px;height:1px;background:linear-gradient(90deg,var(--neon-400),transparent);}
h1.page-title{
  font-size:clamp(30px,4.2vw,52px);line-height:1.1;font-weight:800;letter-spacing:-.02em;
  color:var(--t1);margin-bottom:20px;
}
.page-lead{font-size:17px;line-height:1.85;color:var(--t2);max-width:620px;}
.head-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px;}
.tag{
  display:inline-flex;align-items:center;height:28px;padding:0 12px;border-radius:999px;
  font-size:12px;letter-spacing:.06em;
  background:rgba(95,227,192,.12);color:var(--neon-300);
  border:1px solid rgba(95,227,192,.24);
}
.tag.brass{background:rgba(192,138,75,.12);color:var(--brass-400);border-color:rgba(192,138,75,.32);}
.head-fig{
  border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow-deep);
}
.head-fig img{width:100%;aspect-ratio:4/3;object-fit:cover;filter:saturate(.9) contrast(1.02);}

/* ============ 常见问题主体 ============ */
.faq-section{padding:24px 0 80px;}
.faq-layout{display:grid;grid-template-columns:318px minmax(0,1fr);gap:56px;align-items:start;}
.side{position:sticky;top:88px;display:flex;flex-direction:column;gap:16px;}
.side-card{
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;
}
.side-card h2{font-size:15px;font-weight:700;letter-spacing:.02em;color:var(--t1);margin-bottom:10px;}
.side-card p{font-size:14px;line-height:1.85;color:var(--t2);}
.search{
  display:flex;align-items:center;gap:8px;height:48px;padding:4px 4px 4px 14px;
  background:var(--ink-900);border:1px solid var(--ink-600);border-radius:var(--r-sm);
  margin-top:16px;transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.search:focus-within{border-color:var(--neon-400);box-shadow:0 0 0 3px rgba(95,227,192,.14);}
.search input{
  flex:1;min-width:0;height:100%;background:transparent;border:0;outline:none;
  color:var(--t1);font-size:13.5px;
}
.search input::placeholder{color:var(--t3);}
.search button{
  height:38px;padding:0 14px;border-radius:999px;background:var(--brass-500);
  color:var(--ink-950);font-size:13px;font-weight:700;white-space:nowrap;
  transition:background .2s var(--ease),box-shadow .2s var(--ease);
}
.search button:hover{background:var(--brass-400);box-shadow:0 0 0 3px rgba(192,138,75,.18);}
.side-nav{display:flex;flex-direction:column;gap:2px;margin-top:16px;}
.side-nav a{
  display:flex;align-items:center;gap:10px;padding:8px 8px 8px 10px;border-radius:10px;
  font-size:13.5px;color:var(--t2);border-left:2px solid transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.side-nav a span{font-family:var(--mono);font-size:12px;color:var(--brass-400);}
.side-nav a:hover{background:var(--ink-700);color:var(--t1);border-left-color:var(--neon-400);}
.side-stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:8px;
  border-top:1px solid var(--line);padding-top:16px;margin-top:16px;
}
.stat-num{
  font-family:var(--mono);font-size:24px;font-weight:700;line-height:1.2;
  color:var(--t1);letter-spacing:-.01em;
}
.stat-num em{font-style:normal;font-size:12px;color:var(--brass-400);margin-left:2px;}
.stat-label{font-size:12px;letter-spacing:.06em;color:var(--t3);margin-top:4px;}

.faq-group{margin-bottom:36px;}
.faq-group:last-child{margin-bottom:0;}
.group-title{
  display:flex;align-items:center;gap:12px;margin-bottom:16px;
}
.group-title .idx{
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--brass-400);
  border:1px solid rgba(192,138,75,.35);border-radius:6px;padding:2px 8px;
}
.group-title h2{font-size:22px;font-weight:700;letter-spacing:-.01em;color:var(--t1);}
.group-title .dot{width:6px;height:6px;border-radius:999px;background:var(--neon-400);box-shadow:0 0 8px rgba(95,227,192,.8);}

.faq-item{
  background:var(--ink-800);border:1px solid var(--line);border-radius:var(--r-md);
  margin-bottom:10px;overflow:hidden;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.faq-item:hover{border-color:rgba(95,227,192,.35);}
.faq-item.open{border-color:rgba(95,227,192,.45);box-shadow:0 12px 30px rgba(0,0,0,.35);}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;text-align:left;padding:18px 20px;
  font-size:16px;font-weight:600;line-height:1.6;color:var(--t1);
}
.faq-q .q-idx{font-family:var(--mono);font-size:12px;color:var(--t3);margin-right:10px;}
.faq-icon{
  flex-shrink:0;width:26px;height:26px;border-radius:999px;
  border:1px solid var(--line-strong);position:relative;
  transition:transform .22s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:var(--t2);border-radius:2px;
}
.faq-icon::before{width:11px;height:1.5px;}
.faq-icon::after{width:1.5px;height:11px;}
.faq-item.open .faq-icon{transform:rotate(135deg);border-color:rgba(95,227,192,.6);background:rgba(95,227,192,.10);}
.faq-item.open .faq-icon::before,.faq-item.open .faq-icon::after{background:var(--neon-300);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s var(--ease);}
.faq-a-inner{
  padding:0 20px 20px 20px;font-size:15px;line-height:1.85;color:var(--t2);
  border-top:1px dashed rgba(255,255,255,.07);margin-top:0;padding-top:14px;
}
.faq-a-inner b{color:var(--t1);font-weight:600;}

/* ============ 反馈准备 ============ */
.prep{padding:0 0 72px;}
.prep-head{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:26px;}
.prep-head h2{font-size:28px;font-weight:700;letter-spacing:-.01em;}
.prep-head p{font-size:14px;color:var(--t2);}
.prep-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.prep-item{
  border:1px solid var(--line);border-radius:var(--r-md);padding:22px;
  background:linear-gradient(180deg,rgba(23,25,28,.9),rgba(16,17,19,.9));
  transition:transform .2s var(--ease),border-color .2s var(--ease);
}
.prep-item:hover{transform:translateY(-2px);border-color:rgba(95,227,192,.45);}
.prep-item .num{
  font-family:var(--mono);font-size:13px;letter-spacing:.08em;color:var(--brass-400);
  display:block;margin-bottom:10px;
}
.prep-item h3{font-size:17px;font-weight:600;margin-bottom:6px;}
.prep-item p{font-size:14px;line-height:1.8;color:var(--t2);}

/* ============ 相关栏目 ============ */
.rel{padding:0 0 72px;}
.rel h2{font-size:26px;font-weight:700;letter-spacing:-.01em;margin-bottom:8px;}
.rel .rel-sub{font-size:14px;color:var(--t2);margin-bottom:24px;}
.rel-list{display:flex;flex-direction:column;gap:10px;}
.rel-row{
  position:relative;display:flex;align-items:center;gap:16px;
  padding:18px 20px;border:1px solid var(--line);border-radius:var(--r-md);
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.rel-row::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:2px;border-radius:2px;
  background:var(--neon-400);opacity:0;transition:opacity .2s var(--ease);
}
.rel-row:hover{background:var(--ink-800);border-color:rgba(95,227,192,.3);}
.rel-row:hover::before{opacity:1;}
.rel-row .ridx{font-family:var(--mono);font-size:12px;color:var(--brass-400);letter-spacing:.08em;width:44px;flex-shrink:0;}
.rel-row .rtitle{font-size:16px;font-weight:600;}
.rel-row .rdesc{font-size:13.5px;color:var(--t2);}
.rel-row .rarrow{margin-left:auto;color:var(--t3);font-size:16px;transition:transform .2s var(--ease),color .2s var(--ease);}
.rel-row:hover .rarrow{transform:translateX(4px);color:var(--neon-300);}

/* ============ CTA 沙色卡 ============ */
.cta-section{padding:0 0 96px;}
.cta-card{
  max-width:720px;background:var(--sand-50);color:var(--d1);
  border-radius:var(--r-lg);padding:34px;border:1px solid var(--sand-200);
  box-shadow:var(--shadow-soft);
}
.cta-card .eyebrow-dark{
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--brass-600);
  display:block;margin-bottom:12px;
}
.cta-card h2{font-size:26px;line-height:1.25;font-weight:700;letter-spacing:-.01em;color:var(--d1);margin-bottom:10px;}
.cta-card p{font-size:15px;line-height:1.85;color:var(--d2);margin-bottom:22px;}
.cta-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;}
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;height:46px;padding:0 24px;
  border-radius:999px;background:var(--ink-950);color:var(--sand-50);
  font-size:14.5px;font-weight:700;transition:transform .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease);
}
.btn-primary:hover{background:var(--ink-800);transform:translateY(-1px);box-shadow:0 0 0 3px rgba(22,23,26,.12);}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;height:46px;padding:0 22px;
  border-radius:999px;border:1px solid rgba(22,23,26,.22);color:var(--d1);
  font-size:14.5px;font-weight:600;transition:border-color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease);
}
.btn-ghost:hover{border-color:var(--ink-950);background:rgba(22,23,26,.05);transform:translateY(-1px);}
.text-link{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--d1);
  border-bottom:1px solid rgba(22,23,26,.35);padding-bottom:2px;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.text-link:hover{border-color:var(--ink-950);}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--ink-950);border-top:1px solid var(--line);position:relative;padding-top:64px;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(95,227,192,.6),transparent);
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px;}
.footer-brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;}
.footer-desc{font-size:14px;line-height:1.85;color:var(--t2);max-width:300px;}
.footer-col h4{font-size:13px;letter-spacing:.06em;color:var(--t1);margin-bottom:14px;font-weight:700;}
.footer-col a,.footer-col li{
  display:block;font-size:14px;color:var(--t2);margin-bottom:10px;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-col a:hover{color:var(--t1);transform:translateX(2px);}
.footer-col ul li{margin-bottom:10px;}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid var(--line);padding:20px 0 28px;font-size:12px;color:var(--t3);
}

/* ============ 动效与响应式 ============ */
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important;}
  .faq-a{transition:none!important;}
}
@media (max-width:1024px){
  .head-grid{grid-template-columns:1fr;gap:32px;}
  .head-fig{display:none;}
  .faq-layout{grid-template-columns:1fr;gap:36px;}
  .side{position:static;}
  .prep-grid{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:1023px){
  .nav-inner{height:56px;gap:14px;}
  .burger{display:inline-flex;margin-left:auto;}
  .nav-cta{display:none;}
  .nav-links{
    position:fixed;left:0;right:0;top:0;height:100vh;margin:0;
    padding:88px 24px 32px;background:rgba(11,12,13,.99);
    flex-direction:column;align-items:stretch;gap:2px;z-index:-1;
    transform:translateX(-100%);transition:transform .28s var(--ease);
    overflow-y:auto;
  }
  .nav-open .nav-links{transform:none;}
  .nav-link{font-size:20px;padding:14px 0 14px 16px;width:100%;border-left:2px solid transparent;}
  .nav-link::after{display:none;}
  .nav-link.active{border-left-color:var(--neon-400);padding-left:16px;}
  .nav-link.active::before{display:none;}
  body.nav-open{overflow:hidden;}
}
@media (max-width:768px){
  .wrap{padding:0 20px;}
  .page-head{padding:36px 0 28px;}
  .page-lead{font-size:15.5px;}
  .faq-section{padding:12px 0 56px;}
  .prep-grid{grid-template-columns:1fr;}
  .prep-head h2{font-size:23px;}
  .rel h2{font-size:22px;}
  .cta-card{padding:24px;}
  .cta-card h2{font-size:22px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .group-title h2{font-size:19px;}
  .faq-q{font-size:15px;padding:16px;}
  .faq-a-inner{padding:12px 16px 18px;font-size:14.5px;}
}
@media (max-width:520px){
  .wrap{padding:0 16px;}
  .brand-text{font-size:15.5px;}
  h1.page-title{font-size:29px;}
  .stat-num{font-size:20px;}
  .rel-row .rdesc{display:none;}
  .rel-row .ridx{width:36px;}
  .cta-actions .btn-primary,.cta-actions .btn-ghost{width:100%;}
}