/* roulang page: index */
:root{
  --bg-0:#05090F;--bg-1:#0A121C;--bg-2:#101B27;
  --mesh:rgba(255,255,255,.035);
  --brand:#14E0B4;--brand-deep:#0AA88A;--brand-glow:rgba(20,224,180,.30);
  --accent:#FFB454;--violet:#7C6BFF;
  --t1:#EAF4F2;--t2:#9FB3B8;--t3:#6A8085;
  --line:rgba(255,255,255,.08);--line-brand:rgba(20,224,180,.20);
  --ok:#35D07F;--warn:#FFB454;--err:#FF5C72;
  --r-card:16px;--r-ctl:10px;--r-btn:12px;--r-img:14px;--r-chip:999px;
  --sh-1:0 6px 24px rgba(0,0,0,.35);
  --sh-2:0 14px 40px rgba(0,0,0,.45);
  --sh-glow:0 0 0 1px rgba(20,224,180,.5),0 8px 28px var(--brand-glow);
  --sans:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,monospace;
  --sec:56px;
}
@media(min-width:768px){:root{--sec:80px}}
@media(min-width:1024px){:root{--sec:104px}}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--sans);font-size:16px;line-height:1.85;color:var(--t1);
  background-color:var(--bg-0);
  background-image:linear-gradient(var(--mesh) 1px,transparent 1px),linear-gradient(90deg,var(--mesh) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.25;letter-spacing:-.01em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
ul{margin:0;padding:0;list-style:none}
::selection{background:rgba(20,224,180,.3);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-0)}
::-webkit-scrollbar-thumb{background:#1b2a38;border-radius:999px;border:2px solid var(--bg-0)}
::-webkit-scrollbar-thumb:hover{background:#25404f}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
@media(min-width:1280px){.container{max-width:1200px;padding:0 24px}}
@media(min-width:1440px){.container{max-width:1280px}}
.section{padding:var(--sec) 0;position:relative}
.section + .section{padding-top:0}
.rule{height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.12),transparent);margin:0}
.sec-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:28px}
.sec-head h2{font-size:clamp(24px,3vw,34px);font-weight:700}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.14em;color:var(--brand);text-transform:uppercase;margin-bottom:14px}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--brand)}
.sec-desc{color:var(--t2);max-width:620px;font-size:15px}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;white-space:nowrap;cursor:pointer;border:1px solid transparent;text-decoration:none;
  transition:transform .18s ease-out,box-shadow .18s ease-out,background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out}
.btn svg{flex:0 0 auto}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#04140F;box-shadow:0 8px 24px var(--brand-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(20,224,180,.42)}
.btn-primary:active{transform:translateY(1px);box-shadow:0 4px 14px var(--brand-glow)}
.btn-ghost{background:rgba(255,255,255,.03);border-color:var(--line);color:var(--t1)}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--line-brand);background:rgba(20,224,180,.08);box-shadow:var(--sh-1)}
.btn-ghost:active{transform:translateY(1px)}
.btn-link{background:none;border:0;padding:0;color:var(--brand);font-weight:500;display:inline-flex;align-items:center;gap:6px}
.btn-link:hover{gap:11px}
.btn:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--brand);outline-offset:2px}
.btn[disabled],.btn.is-loading{opacity:.45;box-shadow:none;cursor:not-allowed;transform:none}
.btn-full{width:100%}

/* 标签 */
.chip{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--r-chip);border:1px solid var(--line);
  color:var(--t2);font-size:14px;background:rgba(255,255,255,.015);white-space:nowrap;
  transition:all .18s ease-out}
.chip:hover{color:var(--t1);border-color:var(--line-brand);background:rgba(255,255,255,.05);transform:translateY(-1px)}
.chip.is-active{color:var(--brand);border-color:var(--line-brand);
  background:linear-gradient(135deg,rgba(20,224,180,.22),rgba(20,224,180,.06));
  box-shadow:0 0 0 1px rgba(20,224,180,.22),0 6px 20px rgba(20,224,180,.18)}
.tag{display:inline-flex;align-items:center;padding:4px 11px;border-radius:var(--r-chip);font-size:12px;letter-spacing:.02em;
  border:1px solid var(--line);color:var(--t2);background:rgba(255,255,255,.03)}
.tag-brand{color:var(--brand);border-color:var(--line-brand);background:rgba(20,224,180,.08)}
.tag-accent{color:var(--accent);border-color:rgba(255,180,84,.28);background:rgba(255,180,84,.08)}

/* 导航 */
.site-header{position:sticky;top:0;z-index:60;background:rgba(5,9,15,.72);
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);transition:background-color .2s ease-out,box-shadow .2s ease-out}
.site-header.is-scrolled{background:rgba(5,9,15,.94);box-shadow:var(--sh-1)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:18px;height:72px}
.nav-left,.nav-right{display:flex;align-items:center;gap:18px;min-width:0}
.logo{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.logo-mark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;color:#04140F;
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 6px 18px var(--brand-glow)}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text strong{font-size:17px;letter-spacing:.02em;color:var(--t1);font-weight:700}
.logo-text em{font-style:normal;font-size:10px;letter-spacing:.14em;color:var(--t3);text-transform:uppercase;font-family:var(--mono)}
.nav-chips{display:none}
@media(min-width:1024px){
  .nav-chips{display:flex;align-items:center;gap:6px;padding:4px;border:1px solid var(--line);border-radius:var(--r-chip);background:rgba(255,255,255,.02)}
}
.nav-sep{display:none}
@media(min-width:1024px){.nav-sep{display:block;width:1px;height:26px;background:var(--line)}}
.nav-cta{display:none}
@media(min-width:1024px){.nav-cta{display:inline-flex}}
.nav-toggle{display:grid;place-items:center;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);
  background:rgba(255,255,255,.03);color:var(--t1);cursor:pointer;transition:all .18s ease-out}
.nav-toggle:hover{border-color:var(--line-brand);background:rgba(20,224,180,.08)}
@media(min-width:1024px){.nav-toggle{display:none}}
.drawer{position:fixed;left:0;right:0;top:72px;bottom:0;z-index:55;display:none;flex-direction:column;gap:12px;
  padding:24px 20px 40px;overflow:auto;background:rgba(5,9,15,.98);backdrop-filter:blur(14px)}
.drawer.is-open{display:flex}
.drawer .chip{width:100%;justify-content:center;padding:14px;font-size:15px}
.drawer .btn{width:100%;margin-top:8px}
@media(min-width:1024px){.drawer{display:none!important}}

/* Hero */
.hero{position:relative;padding:56px 0 40px;overflow:hidden}
@media(min-width:1024px){.hero{padding:96px 0 72px}}
.hero-grid{display:grid;gap:44px}
@media(min-width:1024px){.hero-grid{grid-template-columns:7fr 5fr;gap:56px;align-items:center}}
.hero h1{font-size:clamp(30px,4.6vw,52px);line-height:1.15;font-weight:800;letter-spacing:-.02em}
.hero-lead{color:var(--t2);font-size:17px;line-height:1.85;margin-top:20px;max-width:560px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-visual{position:relative;aspect-ratio:16/11;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);
  background:linear-gradient(160deg,#0d1a26,#05090F);box-shadow:var(--sh-2)}
.hero-visual img{width:100%;height:100%;object-fit:cover;opacity:.5}
.hero-visual::after{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 78% 18%,rgba(20,224,180,.32),transparent 58%),
             radial-gradient(circle at 12% 92%,rgba(124,107,255,.24),transparent 60%),
             linear-gradient(180deg,rgba(5,9,15,.15),rgba(5,9,15,.78))}
.hero-float{position:absolute;z-index:2;display:flex;flex-direction:column;gap:4px;padding:14px 16px;border-radius:14px;
  background:linear-gradient(160deg,rgba(255,255,255,.10),rgba(255,255,255,.03));border:1px solid var(--line);
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-1)}
.hero-float b{font-family:var(--mono);font-size:20px;color:var(--brand);letter-spacing:-.01em}
.hero-float span{font-size:12px;color:var(--t2);letter-spacing:.02em}
.hf-1{left:16px;bottom:20px}
.hf-2{right:16px;top:20px}
@media(min-width:768px){.hf-1{left:22px;bottom:26px}.hf-2{right:22px;top:26px}}

/* 指标看板 */
.metrics-panel{border:1px solid var(--line);border-radius:var(--r-card);padding:8px;margin-top:8px;
  background:linear-gradient(160deg,rgba(255,255,255,.055),rgba(255,255,255,.015));
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-1)}
.metrics-grid{display:grid;grid-template-columns:repeat(2,1fr)}
@media(min-width:768px){.metrics-grid{grid-template-columns:repeat(4,1fr)}}
.metric{position:relative;padding:24px 20px;border-radius:12px;transition:transform .18s ease-out,background-color .18s ease-out}
.metric::before{content:"";position:absolute;left:20px;right:20px;top:0;height:1px;
  background:linear-gradient(90deg,var(--brand),transparent)}
.metric:hover{transform:translateY(-2px);background:rgba(255,255,255,.03)}
.metric-value{font-family:var(--mono);font-size:clamp(28px,3.4vw,38px);font-weight:700;color:var(--t1);line-height:1.1;letter-spacing:-.02em}
.metric-value i{font-style:normal;font-size:15px;color:var(--brand);margin-left:2px}
.metric-label{font-size:13px;color:var(--brand);letter-spacing:.02em;margin-top:8px}
.metric-note{font-size:13px;color:var(--t3);line-height:1.7;margin-top:4px}

/* 服务矩阵 */
.services-grid{display:grid;gap:24px}
@media(min-width:768px){.services-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.services-grid{grid-template-columns:repeat(3,1fr)}}
.card{border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-1);
  transition:transform .18s ease-out,border-color .18s ease-out,box-shadow .18s ease-out}
.card:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-2)}
.span-2{grid-column:span 1}
@media(min-width:1024px){.span-2{grid-column:span 2}}
.card-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:linear-gradient(150deg,#0d2029,#08111a)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease-out,filter .35s ease-out}
.card:hover .card-media img{transform:scale(1.03);filter:brightness(1.08)}
.card-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,9,15,0),rgba(5,9,15,.72))}
.card-body{padding:22px}
.card-body h3{font-size:20px;margin-bottom:10px}
.card-body p{color:var(--t2);font-size:15px;line-height:1.8}
.card-num{font-family:var(--mono);font-size:12px;color:var(--brand);letter-spacing:.1em;display:block;margin-bottom:10px}
.card-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px}
.arrow-box{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:var(--brand);
  border:1px solid var(--line-brand);background:rgba(20,224,180,.08);transition:all .18s ease-out}
.card:hover .arrow-box{background:rgba(20,224,180,.18);transform:translateX(3px)}
.mini-card{padding:22px;display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.icon-box{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;color:var(--brand);
  border:1px solid var(--line-brand);background:linear-gradient(160deg,rgba(20,224,180,.16),rgba(20,224,180,.04));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.10)}
.mini-card h3{font-size:17px}
.mini-card p{color:var(--t2);font-size:14px;line-height:1.75}
.mini-card .tag{margin-top:auto}
.services-foot{display:flex;justify-content:center;margin-top:32px}

/* 对比 */
.compare-wrap{display:grid;gap:24px;position:relative}
@media(min-width:768px){.compare-wrap{grid-template-columns:1fr 1fr;gap:44px}}
.compare-wrap::before{content:"";position:absolute;left:50%;top:8px;bottom:8px;width:1px;background:var(--line);display:none}
@media(min-width:768px){.compare-wrap::before{display:block}}
.compare-col{padding:24px;border-radius:var(--r-card);border:1px solid var(--line);background:var(--bg-1)}
.compare-col h3{font-size:17px;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.dot{width:8px;height:8px;border-radius:2px;background:var(--t3);flex:0 0 auto}
.dot-brand{background:var(--brand);box-shadow:0 0 10px var(--brand-glow)}
.compare-col.best{border-color:var(--line-brand);background:linear-gradient(160deg,rgba(20,224,180,.07),rgba(255,255,255,.015))}
.compare-list li{display:flex;gap:12px;align-items:flex-start;padding:12px 0;border-bottom:1px dashed rgba(255,255,255,.07);font-size:15px;color:var(--t2)}
.compare-list li:last-child{border-bottom:0}
.compare-list svg{flex:0 0 auto;margin-top:5px;color:var(--t3)}
.compare-col.best .compare-list svg{color:var(--brand)}
.vs-badge{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;width:48px;height:48px;border-radius:50%;
  display:none;place-items:center;font-family:var(--mono);font-size:13px;font-weight:700;color:var(--bg-0);
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 0 0 6px var(--bg-0),0 8px 24px var(--brand-glow)}
@media(min-width:768px){.vs-badge{display:grid}}
.bars{margin-top:40px;display:grid;gap:22px}
.bar-row{display:grid;gap:8px}
.bar-top{display:flex;justify-content:space-between;align-items:baseline;font-size:14px;color:var(--t2)}
.bar-top b{font-family:var(--mono);color:var(--t1);font-weight:600}
.bar-track{height:8px;border-radius:999px;background:rgba(255,255,255,.06);overflow:hidden}
.bar-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--brand-deep),var(--brand));box-shadow:0 0 14px var(--brand-glow)}
.bar-fill.dim{background:rgba(255,255,255,.16);box-shadow:none}

/* 资讯列表 */
.news-feature{display:grid;gap:0;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;background:var(--bg-1);
  transition:border-color .18s ease-out,transform .18s ease-out,box-shadow .18s ease-out}
.news-feature:hover{border-color:var(--line-brand);transform:translateY(-2px);box-shadow:var(--sh-2)}
@media(min-width:768px){.news-feature{grid-template-columns:15fr 17fr}}
.news-feature-media{position:relative;aspect-ratio:16/9;overflow:hidden;background:linear-gradient(150deg,#0d2029,#08111a)}
@media(min-width:768px){.news-feature-media{aspect-ratio:auto;height:100%}}
.news-feature-media img{width:100%;height:100%;object-fit:cover}
.news-feature-body{padding:26px;display:flex;flex-direction:column;gap:14px}
.news-feature-body h3{font-size:clamp(19px,2vw,23px);line-height:1.4}
.news-feature-body p{color:var(--t2);font-size:15px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:13px;color:var(--t3)}
.card-meta time{font-family:var(--mono);letter-spacing:.02em}
.news-grid{display:grid;gap:20px;margin-top:20px}
@media(min-width:576px){.news-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.news-grid{grid-template-columns:repeat(3,1fr)}}
.news-card{padding:22px;border-radius:var(--r-card);border:1px solid var(--line);background:var(--bg-1);display:flex;flex-direction:column;gap:12px;
  transition:transform .18s ease-out,border-color .18s ease-out,box-shadow .18s ease-out}
.news-card:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:var(--sh-2)}
.news-card h3{font-size:17px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card p{color:var(--t2);font-size:14px;line-height:1.75;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card .card-meta{margin-top:auto}
.empty-state{min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;
  padding:32px;border-radius:var(--r-card);border:1px dashed var(--line);background:rgba(255,255,255,.02)}
.empty-state svg{color:var(--t3)}
.empty-state p{color:var(--t2);font-size:15px}
.filter-chips{display:flex;gap:10px;overflow-x:auto;padding-bottom:4px;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}
.filter-chips::-webkit-scrollbar{display:none}
.filter-chips .chip{scroll-snap-align:start}

/* 证据/信任 */
.trust-grid{display:grid;gap:20px}
@media(min-width:768px){.trust-grid{grid-template-columns:repeat(3,1fr)}}
.trust-card{padding:24px;border-radius:var(--r-card);border:1px solid var(--line);background:var(--bg-1);
  transition:transform .18s ease-out,border-color .18s ease-out}
.trust-card:hover{transform:translateY(-2px);border-color:var(--line-brand)}
.trust-card h3{font-size:16px;margin-bottom:10px}
.trust-card p{font-size:14px;color:var(--t2);line-height:1.78}
.trust-top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;font-family:var(--mono);font-size:14px;
  color:var(--brand);border:1px solid var(--line-brand);background:rgba(20,224,180,.08)}

/* FAQ */
.faq-list{display:grid;gap:12px}
.faq-item{border:1px solid var(--line);border-radius:var(--r-card);background:var(--bg-1);overflow:hidden;
  transition:border-color .18s ease-out}
.faq-item.is-open{border-color:var(--line-brand)}
.faq-q{width:100%;min-height:54px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 22px;
  background:none;border:0;color:var(--t1);font-size:16px;font-weight:600;text-align:left;cursor:pointer;
  transition:color .18s ease-out}
.faq-q:hover{color:var(--brand)}
.faq-icon{flex:0 0 auto;color:var(--brand);transition:transform .2s ease-out}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease-out}
.faq-item.is-open .faq-a{max-height:400px}
.faq-a-inner{padding:0 22px 22px;font-size:15px;line-height:1.85;color:var(--t2);background:rgba(0,0,0,.16)}

/* 转化表单 */
.contact-grid{display:grid;gap:36px}
@media(min-width:1024px){.contact-grid{grid-template-columns:5fr 7fr;gap:48px}}
.contact-list{display:grid;gap:16px;margin-top:26px}
.contact-list li{display:flex;gap:14px;align-items:flex-start}
.contact-list svg{flex:0 0 auto;color:var(--brand);margin-top:3px}
.contact-list b{display:block;font-size:15px;font-weight:600}
.contact-list span{font-size:14px;color:var(--t2)}
.form-card{padding:26px;border-radius:var(--r-card);border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-1)}
.form-row{display:grid;gap:18px}
@media(min-width:576px){.form-row.two{grid-template-columns:1fr 1fr}}
.field{margin-bottom:18px}
.field label{display:block;font-size:13px;color:var(--t2);margin-bottom:8px;letter-spacing:.02em}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border-radius:var(--r-ctl);border:1px solid var(--line);
  background:var(--bg-0);color:var(--t1);font-size:15px;transition:border-color .18s ease-out,box-shadow .18s ease-out}
.field textarea{min-height:110px;resize:vertical;line-height:1.7}
.field input::placeholder,.field textarea::placeholder{color:var(--t3)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(20,224,180,.16)}
.field.has-error input,.field.has-error select,.field.has-error textarea{border-color:var(--err);box-shadow:0 0 0 3px rgba(255,92,114,.14)}
.err-msg{display:none;color:var(--err);font-size:13px;margin-top:6px}
.field.has-error .err-msg{display:block}
.form-note{font-size:13px;color:var(--t3);margin-top:14px;line-height:1.7}
.form-success{display:none;align-items:center;gap:10px;margin-top:16px;padding:14px 16px;border-radius:var(--r-ctl);
  border:1px solid rgba(53,208,127,.35);background:rgba(53,208,127,.10);color:var(--ok);font-size:14px}
.form-success.is-visible{display:flex}
.spinner{width:16px;height:16px;border-radius:50%;border:2px solid rgba(4,20,15,.35);border-top-color:#04140F;animation:spin .7s linear infinite;display:none}
.btn.is-loading .spinner{display:block}
@keyframes spin{to{transform:rotate(360deg)}}

/* CTA 条 */
.cta-band{margin-top:var(--sec);border:1px solid var(--line-brand);border-radius:var(--r-card);padding:32px;
  display:grid;gap:20px;align-items:center;
  background:linear-gradient(120deg,rgba(20,224,180,.12),rgba(124,107,255,.08) 70%,rgba(5,9,15,0));}
@media(min-width:768px){.cta-band{grid-template-columns:1fr auto;padding:40px}}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:10px}
.cta-band p{color:var(--t2);font-size:15px;max-width:640px}

/* 页脚 */
.footer{margin-top:var(--sec);border-top:1px solid var(--line);background:var(--bg-1);padding:56px 0 0}
.footer-grid{display:grid;gap:34px}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}}
.footer h4{font-size:14px;letter-spacing:.06em;color:var(--t1);margin-bottom:16px}
.footer p{font-size:14px;color:var(--t2);line-height:1.8}
.footer-links li{margin-bottom:10px}
.footer-links a{font-size:14px;color:var(--t2);transition:color .18s ease-out,transform .18s ease-out;display:inline-block}
.footer-links a:hover{color:var(--brand);transform:translateX(2px)}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px}
.footer-bottom{margin-top:44px;border-top:1px solid var(--line);padding:20px 0;display:flex;flex-wrap:wrap;gap:12px;
  align-items:center;justify-content:space-between;font-size:13px;color:var(--t3)}
.to-top{display:inline-flex;align-items:center;gap:6px;color:var(--t2);font-size:13px;transition:color .18s ease-out}
.to-top:hover{color:var(--brand)}

/* 入场动效 */
.reveal{opacity:0;transform:translateY(12px)}
.reveal.is-in{opacity:1;transform:none;transition:opacity .6s ease-out,transform .6s ease-out}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none}
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}

/* roulang page: article */
:root{
  --bg-0:#05090F;--bg-1:#0A121C;--bg-2:#101B27;
  --brand:#14E0B4;--brand-deep:#0AA88A;--brand-glow:rgba(20,224,180,.30);
  --accent:#FFB454;--violet:#7C6BFF;
  --t1:#EAF4F2;--t2:#9FB3B8;--t3:#6A8085;
  --line:rgba(255,255,255,.08);--line-brand:rgba(20,224,180,.20);
  --ok:#35D07F;--warn:#FFB454;--err:#FF5C72;
  --r-card:16px;--r-ctrl:10px;--r-btn:12px;--r-img:14px;
  --sh-1:0 6px 24px rgba(0,0,0,.35);
  --sh-2:0 14px 40px rgba(0,0,0,.45);
  --sh-glow:0 0 0 1px rgba(20,224,180,.5),0 8px 28px var(--brand-glow);
  --font-cn:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background-color:var(--bg-0);color:var(--t1);
  font-family:var(--font-cn);font-size:16px;line-height:1.85;font-weight:400;
  -webkit-font-smoothing:antialiased;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:48px 48px;
  background-position:center top;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
::selection{background:var(--brand-glow);color:#04231D}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#070D14}
::-webkit-scrollbar-thumb{background:#1B2C36;border-radius:999px}
::-webkit-scrollbar-thumb:hover{background:#26414C}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
@media(min-width:1440px){.container{max-width:1280px}}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ============ header ============ */
.site-header{position:sticky;top:0;z-index:60;transition:background 200ms ease-out,box-shadow 200ms ease-out,border-color 200ms ease-out;border-bottom:1px solid transparent}
.site-header.is-scrolled{background:rgba(6,11,18,.72);backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);border-bottom-color:var(--line);box-shadow:0 10px 30px rgba(0,0,0,.45)}
.header-inner{display:flex;align-items:center;gap:20px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo-mark{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;color:#04231D;background:linear-gradient(150deg,var(--brand),var(--brand-deep));box-shadow:0 6px 18px var(--brand-glow)}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:17px;font-weight:800;letter-spacing:.02em}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.12em;color:var(--t3);text-transform:uppercase}
.nav-chips{display:flex;align-items:center;gap:8px;margin-left:12px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;scroll-snap-type:x proximity}
.nav-chips::-webkit-scrollbar{display:none}
.chip{scroll-snap-align:start;white-space:nowrap;padding:9px 16px;border-radius:999px;font-size:14px;color:var(--t2);border:1px solid var(--line);background:transparent;transition:all 180ms ease-out}
.chip:hover{color:var(--t1);border-color:var(--line-brand);transform:translateY(-2px)}
.chip.is-active{color:#04231D;font-weight:700;border-color:transparent;background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:var(--sh-glow)}
.header-tail{display:flex;align-items:center;gap:16px;margin-left:auto}
.header-divider{width:1px;height:26px;background:var(--line)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;white-space:nowrap;cursor:pointer;border:1px solid transparent;border-radius:var(--r-btn);padding:11px 20px;font-size:14.5px;font-weight:600;transition:all 180ms ease-out}
.btn-primary{color:#04231D;background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 6px 20px var(--brand-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(20,224,180,.5),0 12px 32px var(--brand-glow)}
.btn-ghost{color:var(--t1);border-color:var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02))}
.btn-ghost:hover{border-color:var(--line-brand);color:var(--brand);transform:translateY(-2px)}
.btn-text{color:var(--brand);padding:8px 4px;gap:6px}
.btn-text:hover{gap:10px}
.btn:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.btn:active{transform:translateY(1px);box-shadow:none}
.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.burger{display:none;width:42px;height:42px;border-radius:var(--r-ctrl);border:1px solid var(--line);background:rgba(255,255,255,.04);align-items:center;justify-content:center;cursor:pointer}
.drawer{position:fixed;inset:72px 0 0 0;z-index:55;background:rgba(5,9,15,.97);backdrop-filter:blur(12px);padding:24px 20px 40px;display:none;overflow-y:auto}
.drawer.is-open{display:block}
.drawer .chip{display:block;text-align:center;margin-bottom:10px;padding:14px 16px;font-size:15px}
.drawer .btn{width:100%;margin-top:8px}
@media(max-width:1023px){
  .nav-chips,.header-tail .btn{display:none}
  .burger{display:inline-flex}
}

/* ============ breadcrumb / layout ============ */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--t3);letter-spacing:.02em;padding:28px 0 0}
.crumbs a{color:var(--t2);transition:color 180ms ease-out}
.crumbs a:hover{color:var(--brand)}
.crumbs span.sep{color:var(--t3);opacity:.6}

.article-shell{padding-bottom:104px}
.article-head{padding:32px 0 28px;border-bottom:1px solid var(--line)}
.head-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;font-size:12.5px;letter-spacing:.02em;color:var(--brand);border:1px solid var(--line-brand);background:rgba(20,224,180,.07)}
.article-head h1{font-size:clamp(26px,3.6vw,42px);line-height:1.2;font-weight:800;letter-spacing:-.02em;margin:18px 0 16px;max-width:900px}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px;font-size:13px;color:var(--t3);letter-spacing:.02em}
.meta-row .dot{width:3px;height:3px;border-radius:50%;background:var(--t3);opacity:.7}
.meta-row .mono{color:var(--t2)}
.head-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.head-actions .btn{padding:9px 16px;font-size:13.5px}

.grid-reading{display:grid;grid-template-columns:1fr;gap:56px}
@media(min-width:1280px){.grid-reading{grid-template-columns:minmax(0,1fr) 260px;gap:56px}}

/* ============ article body ============ */
.article-body{max-width:800px;font-size:16.5px;line-height:1.92;color:#D7E4E2}
.article-body h2{font-size:clamp(21px,2.2vw,26px);font-weight:700;color:var(--t1);margin:2.2em 0 .8em;padding-left:14px;position:relative}
.article-body h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:3px;border-radius:2px;background:linear-gradient(180deg,var(--brand),transparent)}
.article-body h3{font-size:19px;font-weight:600;color:var(--t1);margin:1.8em 0 .6em}
.article-body h4{font-size:16.5px;font-weight:600;color:var(--t1);margin:1.5em 0 .5em}
.article-body p{margin:0 0 1.25em}
.article-body a{color:var(--brand);border-bottom:1px solid var(--line-brand);transition:border-color 180ms ease-out}
.article-body a:hover{border-bottom-color:var(--brand)}
.article-body strong{color:#F3FBFA;font-weight:600}
.article-body ul,.article-body ol{margin:0 0 1.4em;padding-left:0}
.article-body ul li,.article-body ol li{position:relative;padding-left:22px;margin-bottom:.6em}
.article-body ul li::before{content:"";position:absolute;left:2px;top:.72em;width:6px;height:6px;border-radius:2px;background:var(--brand);opacity:.85}
.article-body ol{counter-reset:li}
.article-body ol li{counter-increment:li;padding-left:30px}
.article-body ol li::before{content:counter(li,decimal-leading-zero);position:absolute;left:0;top:0;font-family:var(--font-mono);font-size:12.5px;color:var(--brand);letter-spacing:.04em}
.article-body blockquote{margin:1.6em 0;padding:16px 20px;border-left:3px solid var(--brand);border-radius:0 var(--r-ctrl) var(--r-ctrl) 0;background:linear-gradient(160deg,rgba(20,224,180,.08),rgba(255,255,255,.015));color:#CBE0DC}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--r-img);border:1px solid var(--line);margin:1.6em 0 .6em;width:100%}
.article-body figure{margin:1.6em 0}
.article-body figcaption{font-size:13px;color:var(--t3);text-align:center;letter-spacing:.02em}
.article-body code{font-family:var(--font-mono);font-size:.9em;background:rgba(255,255,255,.06);border:1px solid var(--line);border-radius:6px;padding:2px 6px;color:#9FF0DE}
.article-body pre{margin:1.6em 0;padding:18px 20px;border-radius:var(--r-card);background:var(--bg-2);border:1px solid var(--line);overflow-x:auto}
.article-body pre code{background:none;border:0;padding:0;font-size:14px;line-height:1.75;color:#D7E4E2}
.article-body table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:14.5px;background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-ctrl);overflow:hidden}
.article-body th{background:rgba(20,224,180,.10);color:var(--t1);text-align:left;font-weight:600;padding:12px 14px;border-bottom:1px solid var(--line)}
.article-body td{padding:12px 14px;border-bottom:1px solid var(--line);color:var(--t2)}
.article-body tr:last-child td{border-bottom:0}
.article-body hr{border:0;height:1px;margin:2.4em 0;background:linear-gradient(90deg,transparent,var(--line),transparent)}

/* ============ aside toc ============ */
.toc-card{position:sticky;top:96px;padding:20px;border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));backdrop-filter:blur(14px) saturate(140%);box-shadow:var(--sh-1)}
.toc-card h4{font-size:13px;letter-spacing:.12em;color:var(--t3);text-transform:uppercase;margin-bottom:14px;font-family:var(--font-mono);font-weight:500}
.toc-card ul li{border-bottom:1px dashed var(--line)}
.toc-card ul li:last-child{border-bottom:0}
.toc-card ul li a{display:block;padding:9px 0;font-size:13.5px;color:var(--t2);transition:all 180ms ease-out}
.toc-card ul li a:hover{color:var(--brand);transform:translateX(2px)}
.toc-note{margin-top:16px;padding-top:16px;border-top:1px solid var(--line);font-size:12.5px;color:var(--t3);line-height:1.7}
.toc-note a{color:var(--brand)}

/* ============ tags / related / pager ============ */
.tag-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:44px;padding-top:26px;border-top:1px solid var(--line)}
.tag-row .label{font-size:13px;color:var(--t3);letter-spacing:.04em}
.tag{display:inline-flex;align-items:center;padding:6px 14px;border-radius:999px;font-size:13px;color:var(--t2);border:1px solid var(--line);background:rgba(255,255,255,.03);transition:all 180ms ease-out}
.tag:hover{color:var(--brand);border-color:var(--line-brand);transform:translateY(-2px)}

.sec-panel{margin-top:72px}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:26px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.sec-head h2{font-size:clamp(21px,2.2vw,26px)}
.sec-head p{margin:8px 0 0;font-size:13.5px;color:var(--t3);letter-spacing:.02em}
.rail{display:grid;gap:24px;grid-template-columns:1fr}
@media(min-width:768px){.rail{grid-template-columns:repeat(3,1fr)}}
.card{display:flex;flex-direction:column;border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));backdrop-filter:blur(14px) saturate(140%);box-shadow:var(--sh-1);overflow:hidden;transition:all 200ms ease-out}
.card:hover{border-color:var(--line-brand);transform:translateY(-2px);box-shadow:var(--sh-2)}
.card-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:linear-gradient(140deg,#0B1A22,#06110F)}
.card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 220ms ease-out,filter 220ms ease-out}
.card:hover .card-thumb img{transform:scale(1.03);filter:brightness(1.08)}
.card-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.card-body h3{font-size:17px;line-height:1.45;font-weight:600}
.card-body p{font-size:14px;color:var(--t2);line-height:1.75;margin:0}
.card-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:12.5px;color:var(--t3)}
.card-foot .cat{color:var(--accent)}

.pager{display:grid;gap:16px;grid-template-columns:1fr;margin-top:24px}
@media(min-width:768px){.pager{grid-template-columns:1fr 1fr}}
.pager a{display:block;padding:18px 20px;border-radius:var(--r-card);border:1px solid var(--line);background:rgba(255,255,255,.03);transition:all 200ms ease-out}
.pager a:hover{border-color:var(--line-brand);transform:translateY(-2px);box-shadow:var(--sh-1)}
.pager .dir{font-size:12px;color:var(--t3);letter-spacing:.12em;font-family:var(--font-mono)}
.pager .txt{display:block;margin-top:8px;font-size:15px;font-weight:600;color:var(--t1)}
.pager .next{text-align:right}

.back-bar{margin-top:40px;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;padding:22px 24px;border-radius:var(--r-card);border:1px solid var(--line-brand);background:linear-gradient(135deg,rgba(20,224,180,.10),rgba(124,107,255,.06));box-shadow:var(--sh-1)}
.back-bar p{margin:0;font-size:14.5px;color:var(--t1)}
.back-bar span{display:block;font-size:13px;color:var(--t2);margin-top:4px}

/* ============ empty state ============ */
.empty-card{max-width:640px;padding:48px 32px;border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));text-align:center;box-shadow:var(--sh-1)}
.empty-icon{width:56px;height:56px;margin:0 auto 20px;border-radius:16px;display:grid;place-items:center;color:var(--brand);background:rgba(20,224,180,.10);border:1px solid var(--line-brand)}
.empty-card h2{font-size:22px;margin-bottom:12px}
.empty-card p{color:var(--t2);font-size:15px;margin-bottom:24px}

/* ============ footer ============ */
.footer{margin-top:0;border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(16,27,39,.6),rgba(5,9,15,.95))}
.footer::before{content:"";display:block;height:1px;background:linear-gradient(90deg,transparent,var(--brand-glow),transparent)}
.footer-grid{display:grid;gap:40px;grid-template-columns:1fr;padding:64px 0 40px}
@media(min-width:768px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-brand .logo-mark{width:36px;height:36px;border-radius:11px}
.footer-brand .logo-text strong{font-size:16px;font-weight:800}
.footer-brand .logo-text em{font-size:10.5px;letter-spacing:.12em;color:var(--t3);font-style:normal;text-transform:uppercase}
.footer p{font-size:14px;color:var(--t2);line-height:1.8;max-width:340px}
.footer h4{font-size:13px;letter-spacing:.12em;color:var(--t3);font-family:var(--font-mono);font-weight:500;text-transform:uppercase;margin-bottom:18px}
.footer-links li{margin-bottom:11px}
.footer-links a{font-size:14px;color:var(--t2);transition:all 180ms ease-out;display:inline-block}
.footer-links a:hover{color:var(--brand);transform:translateX(2px)}
.footer-bottom{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;padding:22px 0 32px;border-top:1px solid var(--line);font-size:13px;color:var(--t3)}
.to-top{display:inline-flex;align-items:center;gap:8px;color:var(--t2);transition:all 180ms ease-out}
.to-top:hover{color:var(--brand);transform:translateY(-2px)}

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

/* roulang page: category1 */
:root{
  --bg-0:#05090F;--bg-1:#0A121C;--bg-2:#101B27;
  --brand:#14E0B4;--brand-deep:#0AA88A;--brand-glow:rgba(20,224,180,.30);
  --accent:#FFB454;--violet:#7C6BFF;
  --t1:#EAF4F2;--t2:#9FB3B8;--t3:#6A8085;
  --line:rgba(255,255,255,.08);--line-brand:rgba(20,224,180,.20);
  --ok:#35D07F;--warn:#FFB454;--err:#FF5C72;
  --r-card:16px;--r-ctl:10px;--r-btn:12px;--r-img:14px;--r-chip:999px;
  --sh-1:0 6px 24px rgba(0,0,0,.35);--sh-2:0 14px 40px rgba(0,0,0,.45);
  --sh-glow:0 0 0 1px rgba(20,224,180,.5),0 8px 28px var(--brand-glow);
  --maxw:1200px;
  --mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg-0);color:var(--t1);font-family:var(--sans);
  font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:48px 48px,48px 48px;
  background-position:center top;
}
img{max-width:100%;display:block;border-radius:var(--r-img)}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25;letter-spacing:-.01em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul{margin:0;padding:0;list-style:none}
::selection{background:var(--brand-glow);color:#04120E}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-0)}
::-webkit-scrollbar-thumb{background:#1B2A38;border-radius:99px;border:2px solid var(--bg-0)}
::-webkit-scrollbar-thumb:hover{background:#26394A}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
@media(min-width:1280px){.container{max-width:1280px;padding:0 24px}}
.section{padding:56px 0}
@media(min-width:768px){.section{padding:80px 0}}
@media(min-width:1280px){.section{padding:104px 0}}
.section+.section{padding-top:0}
.sec-head{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;padding-bottom:18px;margin-bottom:32px;border-bottom:1px solid var(--line);position:relative}
.sec-head::after{content:"";position:absolute;left:0;bottom:-1px;width:120px;height:1px;background:linear-gradient(90deg,var(--brand),transparent)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.14em;color:var(--brand);text-transform:uppercase;margin-bottom:12px}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--brand)}
h2{font-size:clamp(24px,3vw,34px);font-weight:700}
.sec-sub{color:var(--t2);font-size:15px;max-width:640px;margin-top:10px}
/* header */
.site-header{position:sticky;top:0;z-index:60;transition:background .2s ease-out,box-shadow .2s ease-out,border-color .2s ease-out;border-bottom:1px solid transparent}
.site-header.is-scrolled{background:rgba(5,9,15,.82);backdrop-filter:blur(14px) saturate(140%);border-bottom-color:var(--line);box-shadow:0 10px 30px rgba(0,0,0,.45)}
.header-inner{display:flex;align-items:center;gap:18px;min-height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;color:var(--brand);background:linear-gradient(160deg,rgba(20,224,180,.20),rgba(255,255,255,.03));border:1px solid var(--line-brand);box-shadow:inset 0 1px 0 rgba(255,255,255,.08)}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text strong{font-size:17px;font-weight:700;letter-spacing:.02em}
.logo-text em{font-style:normal;font-size:10px;letter-spacing:.22em;color:var(--t3);font-family:var(--mono)}
.nav-chips{display:none;flex:1;gap:6px;justify-content:center}
.chip{padding:8px 16px;border-radius:var(--r-chip);border:1px solid var(--line);color:var(--t2);font-size:14px;white-space:nowrap;transition:all .18s ease-out}
.chip:hover{color:var(--t1);border-color:var(--line-brand);transform:translateY(-2px)}
.chip.is-active{color:#04120E;font-weight:600;background:linear-gradient(120deg,var(--brand),var(--brand-deep));border-color:transparent;box-shadow:0 6px 20px var(--brand-glow)}
.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
.nav-divider{display:none;width:1px;height:24px;background:var(--line)}
.menu-toggle{width:42px;height:42px;display:grid;place-items:center;border-radius:var(--r-ctl);background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--t1);cursor:pointer;transition:all .18s ease-out}
.menu-toggle:hover{border-color:var(--line-brand);color:var(--brand)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:var(--r-btn);font-size:15px;font-weight:600;white-space:nowrap;border:1px solid transparent;cursor:pointer;transition:transform .18s ease-out,box-shadow .18s ease-out,background .18s ease-out,color .18s ease-out}
.btn-primary{background:linear-gradient(120deg,var(--brand),var(--brand-deep));color:#04120E;box-shadow:0 8px 24px var(--brand-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px var(--brand-glow)}
.btn-primary:active{transform:translateY(1px);box-shadow:0 4px 14px var(--brand-glow)}
.btn-ghost{background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border-color:var(--line);color:var(--t1);backdrop-filter:blur(14px)}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--line-brand);color:var(--brand)}
.btn-sm{padding:9px 18px;font-size:14px}
.btn:disabled{opacity:.45;box-shadow:none;cursor:not-allowed;transform:none}
.btn-block{width:100%}
.drawer{position:fixed;inset:72px 0 0;z-index:55;background:rgba(5,9,15,.96);backdrop-filter:blur(18px);padding:28px 20px;display:none;flex-direction:column;gap:10px}
.drawer.is-open{display:flex}
.drawer .chip{display:block;text-align:left;padding:14px 16px;font-size:16px}
.drawer .btn{margin-top:12px}
@media(min-width:1024px){
  .nav-chips{display:flex}
  .nav-divider{display:block}
  .menu-toggle{display:none}
  .drawer{display:none!important}
}
/* breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--t3);padding:22px 0 0}
.breadcrumb a{color:var(--t2);transition:color .18s ease-out}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb span.sep{color:var(--t3);font-family:var(--mono)}
/* page hero */
.page-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.page-hero .bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.webp');background-size:cover;background-position:center;opacity:.26;filter:saturate(120%)}
.page-hero .veil{position:absolute;inset:0;background:radial-gradient(700px 380px at 18% 10%,rgba(20,224,180,.20),transparent 65%),radial-gradient(600px 340px at 88% 90%,rgba(124,107,255,.16),transparent 68%),linear-gradient(180deg,rgba(5,9,15,.72),rgba(5,9,15,.96))}
.page-hero .inner{position:relative;padding:44px 0 52px;display:grid;grid-template-columns:1fr;gap:32px}
@media(min-width:1024px){.page-hero .inner{padding:64px 0 72px;grid-template-columns:1.35fr .65fr;align-items:center;gap:44px}}
.page-hero h1{font-size:clamp(30px,4.6vw,52px);line-height:1.15;font-weight:800;letter-spacing:-.02em;margin-bottom:16px}
.page-hero h1 .hl{background:linear-gradient(120deg,var(--brand),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{color:var(--t2);font-size:17px;max-width:620px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.tag{display:inline-flex;align-items:center;gap:6px;padding:6px 13px;border-radius:var(--r-chip);font-size:13px;color:var(--t2);background:rgba(255,255,255,.04);border:1px solid var(--line)}
.tag.is-accent{color:var(--accent);border-color:rgba(255,180,84,.28);background:rgba(255,180,84,.08)}
.glass{background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border:1px solid var(--line);border-radius:var(--r-card);backdrop-filter:blur(14px) saturate(140%);box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.08)}
.hero-card{padding:18px;display:flex;flex-direction:column;gap:12px}
.hero-metric{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:14px 16px;border-radius:12px;background:rgba(10,18,28,.72);border:1px solid var(--line)}
.hero-metric b{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:26px;color:var(--brand)}
.hero-metric span{font-size:13px;color:var(--t2)}
.hero-card img{aspect-ratio:16/9;object-fit:cover;width:100%;border:1px solid var(--line)}
/* stats */
.stat-panel{border-radius:var(--r-card);padding:8px;background:linear-gradient(160deg,rgba(255,255,255,.05),rgba(255,255,255,.015));border:1px solid var(--line)}
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
@media(min-width:768px){.stat-grid{grid-template-columns:repeat(4,1fr)}}
.stat{position:relative;padding:22px 18px;border-radius:12px;background:rgba(10,18,28,.6);transition:transform .18s ease-out,background .18s ease-out}
.stat::before{content:"";position:absolute;top:0;left:18px;right:18px;height:1px;background:linear-gradient(90deg,var(--brand),transparent)}
.stat:hover{transform:translateY(-2px);background:rgba(16,27,39,.9)}
.stat b{display:block;font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:clamp(28px,3.4vw,38px);color:var(--t1);line-height:1.1}
.stat b i{font-style:normal;font-size:14px;color:var(--brand);margin-left:4px}
.stat span{display:block;font-size:13px;color:var(--brand);letter-spacing:.06em;margin-top:8px}
.stat p{font-size:13px;color:var(--t3);margin:6px 0 0;line-height:1.7}
/* feature rows */
.feature{display:grid;gap:28px;align-items:center;padding:32px 0;border-bottom:1px solid var(--line)}
.feature:last-of-type{border-bottom:0}
@media(min-width:900px){.feature{grid-template-columns:1fr 1fr;gap:56px}.feature.reverse .feature-media{order:-1}}
.feature-media{position:relative}
.feature-media img{aspect-ratio:16/10;object-fit:cover;width:100%;border:1px solid var(--line);box-shadow:var(--sh-1);transition:transform .2s ease-out,filter .2s ease-out}
.feature-media img:hover{transform:scale(1.03);filter:brightness(1.08)}
.feature-media .badge{position:absolute;left:14px;bottom:14px;padding:8px 14px;border-radius:var(--r-chip);font-size:13px;font-family:var(--mono);color:#04120E;background:linear-gradient(120deg,var(--brand),var(--brand-deep));box-shadow:0 8px 22px var(--brand-glow)}
.feature h3{font-size:20px;margin-bottom:12px}
.feature p{color:var(--t2);font-size:15.5px}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:var(--t2);margin-top:10px}
.check svg{flex-shrink:0;margin-top:6px;color:var(--brand)}
/* scenes */
.scene-grid{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:640px){.scene-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.scene-grid{grid-template-columns:repeat(4,1fr)}}
.scene{padding:22px;border-radius:var(--r-card);background:linear-gradient(160deg,rgba(255,255,255,.055),rgba(255,255,255,.015));border:1px solid var(--line);transition:transform .18s ease-out,border-color .18s ease-out,box-shadow .18s ease-out}
.scene:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:var(--sh-1)}
.scene .ico{width:44px;height:44px;display:grid;place-items:center;border-radius:12px;color:var(--brand);background:rgba(20,224,180,.10);border:1px solid var(--line-brand);margin-bottom:16px}
.scene h3{font-size:17px;margin-bottom:8px}
.scene p{font-size:14px;color:var(--t3);line-height:1.75}
/* numbered list */
.num-list{border-top:1px solid var(--line)}
.num-item{display:grid;grid-template-columns:44px 1fr;gap:20px;padding:26px 0;border-bottom:1px solid var(--line);transition:background .18s ease-out}
.num-item:hover{background:rgba(255,255,255,.02)}
.num-idx{width:44px;height:44px;display:grid;place-items:center;border-radius:10px;font-family:var(--mono);font-size:15px;font-weight:600;color:#04120E;background:linear-gradient(120deg,var(--brand),var(--brand-deep));box-shadow:0 6px 18px var(--brand-glow)}
.num-item h3{font-size:18px;margin-bottom:8px}
.num-item p{color:var(--t2);font-size:15px;margin:0}
.num-item .meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
@media(min-width:768px){.num-item{grid-template-columns:44px 1fr 220px;align-items:start}.num-item .side{font-size:13px;color:var(--t3);font-family:var(--mono);text-align:right}}
.num-item .side{font-size:13px;color:var(--t3);font-family:var(--mono);margin-top:10px}
@media(min-width:768px){.num-item .side{margin-top:2px}}
/* faq */
.faq{display:grid;gap:12px}
.faq-item{border-radius:var(--r-card);background:linear-gradient(160deg,rgba(255,255,255,.05),rgba(255,255,255,.015));border:1px solid var(--line);overflow:hidden;transition:border-color .18s ease-out,box-shadow .18s ease-out}
.faq-item:hover{border-color:var(--line-brand)}
.faq-item.is-open{border-color:var(--line-brand);box-shadow:var(--sh-1)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 20px;min-height:54px;background:none;border:0;text-align:left;font-size:16px;font-weight:600;color:var(--t1);cursor:pointer}
.faq-q .plus{flex-shrink:0;width:26px;height:26px;display:grid;place-items:center;border-radius:8px;border:1px solid var(--line);color:var(--brand);transition:transform .2s ease-out,background .2s ease-out}
.faq-item.is-open .plus{transform:rotate(45deg);background:rgba(20,224,180,.12)}
.faq-a{padding:0 20px 20px;font-size:15px;color:var(--t2);line-height:1.85;background:rgba(5,9,15,.35);display:none}
.faq-item.is-open .faq-a{display:block}
/* related */
.related{display:flex;flex-wrap:wrap;gap:10px}
.related a{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:var(--r-chip);font-size:14px;color:var(--t2);background:rgba(255,255,255,.04);border:1px solid var(--line);transition:all .18s ease-out}
.related a:hover{color:var(--brand);border-color:var(--line-brand);transform:translateY(-2px)}
/* cta band */
.cta-band{position:relative;overflow:hidden;border-radius:var(--r-card);padding:36px 26px;border:1px solid var(--line-brand);background:linear-gradient(140deg,rgba(20,224,180,.14),rgba(124,107,255,.10) 55%,rgba(255,255,255,.02));backdrop-filter:blur(14px)}
@media(min-width:768px){.cta-band{padding:48px 44px;display:flex;align-items:center;justify-content:space-between;gap:32px}}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:10px}
.cta-band p{color:var(--t2);font-size:15px;max-width:560px;margin:0}
.cta-band .acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
@media(min-width:768px){.cta-band .acts{margin-top:0;flex-shrink:0}}
/* footer */
.footer{margin-top:56px;border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(10,18,28,.6),rgba(5,9,15,.95));position:relative}
.footer::before{content:"";position:absolute;top:-1px;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--brand),transparent)}
.footer-grid{display:grid;grid-template-columns:1fr;gap:34px;padding:48px 0 32px}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer p{color:var(--t3);font-size:14px;line-height:1.8;max-width:340px}
.footer h4{font-size:15px;margin-bottom:16px;color:var(--t1)}
.footer-links{display:grid;gap:10px}
.footer-links a{color:var(--t3);font-size:14px;transition:color .18s ease-out,transform .18s ease-out;display:inline-block}
.footer-links a:hover{color:var(--brand);transform:translateX(2px)}
.footer-bottom{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;padding:20px 0 28px;border-top:1px solid var(--line);font-size:13px;color:var(--t3)}
.to-top{display:inline-flex;align-items:center;gap:8px;color:var(--t2);transition:color .18s ease-out}
.to-top:hover{color:var(--brand)}
/* reveal */
.reveal{opacity:0;transform:translateY(12px)}
.reveal.is-in{opacity:1;transform:none;transition:opacity .6s ease-out,transform .6s ease-out}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category2 */
:root{
  --bg-0:#05090F; --bg-1:#0A121C; --bg-2:#101B27;
  --bg-mesh:rgba(255,255,255,.035);
  --brand:#14E0B4; --brand-deep:#0AA88A; --brand-glow:rgba(20,224,180,.30);
  --accent:#FFB454; --violet:#7C6BFF;
  --t1:#EAF4F2; --t2:#9FB3B8; --t3:#6A8085;
  --line:rgba(255,255,255,.08); --line-brand:rgba(20,224,180,.20);
  --ok:#35D07F; --warn:#FFB454; --err:#FF5C72;
  --r-card:16px; --r-ctl:10px; --r-btn:12px; --r-img:14px;
  --sh-1:0 6px 24px rgba(0,0,0,.35);
  --sh-2:0 14px 40px rgba(0,0,0,.45);
  --sh-glow:0 0 0 1px rgba(20,224,180,.5),0 8px 28px var(--brand-glow);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg-0); color:var(--t1);
  font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px; line-height:1.85; -webkit-font-smoothing:antialiased;
  background-image:linear-gradient(var(--bg-mesh) 1px,transparent 1px),linear-gradient(90deg,var(--bg-mesh) 1px,transparent 1px);
  background-size:48px 48px,48px 48px;
}
body.no-scroll{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul{margin:0;padding:0;list-style:none}
::selection{background:var(--brand);color:#04120F}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-0)}
::-webkit-scrollbar-thumb{background:#1B2A38;border-radius:999px;border:2px solid var(--bg-0)}
::-webkit-scrollbar-thumb:hover{background:#263B4D}
.mono{font-family:"JetBrains Mono","Roboto Mono",ui-monospace,monospace;font-variant-numeric:tabular-nums}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
@media(min-width:1280px){.container{max-width:1280px;padding:0 24px}}

/* ---------- header / nav ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(5,9,15,.72);backdrop-filter:blur(6px);transition:background 200ms var(--ease),box-shadow 200ms var(--ease),border-color 200ms var(--ease);border-bottom:1px solid transparent}
.site-header.is-scrolled{background:rgba(8,14,22,.86);backdrop-filter:blur(16px) saturate(140%);border-bottom-color:var(--line);box-shadow:0 10px 30px rgba(0,0,0,.45)}
.nav-inner{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:24px;height:74px}
.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.logo-mark{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;color:var(--brand);background:linear-gradient(160deg,rgba(20,224,180,.20),rgba(20,224,180,.04));border:1px solid var(--line-brand);box-shadow:inset 0 1px 0 rgba(255,255,255,.08)}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:17px;font-weight:700;letter-spacing:.02em}
.logo-text em{font-style:normal;font-size:11px;color:var(--t3);letter-spacing:.12em;text-transform:uppercase;font-family:"JetBrains Mono","Roboto Mono",monospace}
.nav-chips{display:flex;justify-content:center;gap:8px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px 2px;-ms-overflow-style:none;scrollbar-width:none}
.nav-chips::-webkit-scrollbar{display:none}
.chip{flex:0 0 auto;scroll-snap-align:center;display:inline-flex;align-items:center;padding:8px 16px;border-radius:999px;border:1px solid var(--line);color:var(--t2);font-size:14px;white-space:nowrap;transition:color 180ms var(--ease),border-color 180ms var(--ease),background 180ms var(--ease),transform 180ms var(--ease),box-shadow 180ms var(--ease)}
.chip:hover{color:var(--t1);border-color:var(--line-brand);background:rgba(255,255,255,.03);transform:translateY(-1px)}
.chip.is-active{background:linear-gradient(120deg,var(--brand-deep),var(--brand));color:#04120F;font-weight:600;border-color:transparent;box-shadow:0 8px 24px var(--brand-glow)}
.nav-right{display:flex;align-items:center;gap:18px;flex:0 0 auto}
.nav-divider{width:1px;height:24px;background:var(--line)}
.nav-toggle{display:none;width:42px;height:42px;border-radius:var(--r-ctl);border:1px solid var(--line);place-items:center;color:var(--t1);transition:border-color 180ms var(--ease),background 180ms var(--ease)}
.nav-toggle:hover{border-color:var(--line-brand);background:rgba(255,255,255,.04)}
.drawer{position:fixed;inset:74px 0 0 0;z-index:55;background:rgba(6,10,17,.96);backdrop-filter:blur(18px);padding:26px 20px 40px;display:flex;flex-direction:column;gap:10px;transform:translateY(-12px);opacity:0;visibility:hidden;transition:opacity 200ms var(--ease),transform 200ms var(--ease),visibility 200ms}
.drawer.is-open{opacity:1;visibility:visible;transform:translateY(0)}
.drawer .chip{width:100%;justify-content:center;padding:13px 16px;border-radius:var(--r-ctl);font-size:15px}
.drawer .btn{width:100%;margin-top:8px}
@media(max-width:1023px){
  .nav-chips{display:none}
  .nav-divider,.nav-right .btn{display:none}
  .nav-toggle{display:grid}
  .nav-inner{grid-template-columns:1fr auto;height:66px}
  .drawer{inset:66px 0 0 0}
}
@media(min-width:1024px){.drawer{display:none}}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;white-space:nowrap;padding:12px 22px;border-radius:var(--r-btn);font-size:15px;font-weight:600;border:1px solid transparent;transition:transform 180ms var(--ease),box-shadow 180ms var(--ease),background 180ms var(--ease),border-color 180ms var(--ease),color 180ms var(--ease)}
.btn-primary{background:linear-gradient(120deg,var(--brand-deep),var(--brand));color:#04120F;box-shadow:0 8px 26px var(--brand-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(20,224,180,.5),0 14px 36px var(--brand-glow)}
.btn-primary:active{transform:translateY(1px);box-shadow:0 4px 14px rgba(20,224,180,.24)}
.btn-ghost-glass{border-color:var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));color:var(--t1);backdrop-filter:blur(14px) saturate(140%)}
.btn-ghost-glass:hover{border-color:var(--line-brand);transform:translateY(-2px);box-shadow:var(--sh-1)}
.btn-sm{padding:9px 18px;font-size:14px;border-radius:var(--r-ctl)}
.btn-text{color:var(--brand);padding:6px 0;font-weight:600;background:none;border:0}
.btn-text:hover{color:var(--t1)}
.btn[disabled],.btn.is-disabled{opacity:.45;box-shadow:none;pointer-events:none}

/* ---------- sections ---------- */
.section{padding:56px 0;position:relative}
@media(min-width:768px){.section{padding:80px 0}}
@media(min-width:1280px){.section{padding:104px 0}}
.section-alt{background:linear-gradient(180deg,rgba(16,27,39,.55),rgba(10,18,28,.25));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px}
.section-head h2{font-size:clamp(24px,3vw,34px);letter-spacing:-.01em}
.section-head p{color:var(--t2);font-size:15px;max-width:640px;margin:8px 0 0}
.hairline{height:1px;border:0;margin:0;background:linear-gradient(90deg,transparent,var(--line-brand),transparent)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:"JetBrains Mono","Roboto Mono",monospace;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand)}
.eyebrow::before{content:"";width:20px;height:1px;background:var(--brand)}

/* ---------- breadcrumb ---------- */
.breadcrumb{padding:22px 0 0;font-size:13px;color:var(--t3);letter-spacing:.02em}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.breadcrumb a{color:var(--t2);transition:color 180ms var(--ease)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:var(--t3)}
.breadcrumb [aria-current]{color:var(--t1)}

/* ---------- page hero ---------- */
.page-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background-image:linear-gradient(180deg,rgba(5,9,15,.82),rgba(5,9,15,.96)),url("/assets/images/backpic/back-2.png");background-size:cover;background-position:center}
.page-hero::after{content:"";position:absolute;width:620px;height:620px;right:-180px;top:-260px;border-radius:50%;background:radial-gradient(circle,rgba(20,224,180,.22),transparent 66%);pointer-events:none}
.page-hero-inner{position:relative;z-index:2;padding:38px 0 56px;display:grid;grid-template-columns:1fr;gap:32px;align-items:center}
@media(min-width:1024px){.page-hero-inner{grid-template-columns:minmax(0,1.35fr) minmax(0,.9fr);gap:48px;padding:52px 0 72px}}
.page-hero h1{font-size:clamp(30px,4.6vw,52px);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin:16px 0 14px}
.page-hero .lead{font-size:17px;color:var(--t2);max-width:620px}
.hero-panel{display:grid;gap:14px}
.stat-mini{border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));backdrop-filter:blur(14px) saturate(140%);box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-1);padding:16px 18px;transition:transform 200ms var(--ease),border-color 200ms var(--ease)}
.stat-mini:hover{transform:translateY(-2px);border-color:var(--line-brand)}
.stat-mini .num{font-family:"JetBrains Mono","Roboto Mono",monospace;font-size:28px;font-weight:700;color:var(--t1);font-variant-numeric:tabular-nums}
.stat-mini .num span{font-size:13px;color:var(--t3);margin-left:5px;font-weight:500}
.stat-mini .cap{font-size:13px;color:var(--t2)}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.tag{display:inline-flex;align-items:center;padding:6px 13px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.03);font-size:13px;color:var(--t2);letter-spacing:.02em}
.tag.is-brand{border-color:var(--line-brand);color:var(--brand);background:rgba(20,224,180,.07)}

/* ---------- tiles (三列不等宽磁贴) ---------- */
.tile-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:768px){.tile-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tile-lg{grid-column:span 2}}
@media(min-width:1024px){.tile-grid{grid-template-columns:1.45fr 1fr 1fr}.tile-lg{grid-column:auto;grid-row:span 1}}
.tile{position:relative;border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));backdrop-filter:blur(14px) saturate(140%);box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-1);padding:22px;display:flex;flex-direction:column;gap:14px;transition:transform 200ms var(--ease),border-color 200ms var(--ease),box-shadow 200ms var(--ease)}
.tile:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-2)}
.tile-lg{padding:0;overflow:hidden}
.tile-media{position:relative;aspect-ratio:16/9;border-bottom:1px solid var(--line);overflow:hidden;background:linear-gradient(140deg,#0C1A24,#071018)}
.tile-media img{width:100%;height:100%;object-fit:cover;opacity:.9;transition:transform 300ms var(--ease),opacity 300ms var(--ease)}
.tile-lg:hover .tile-media img{transform:scale(1.03);opacity:1}
.tile-body{padding:22px;display:flex;flex-direction:column;gap:12px}
.tile-no{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-family:"JetBrains Mono","Roboto Mono",monospace;font-size:12px;font-weight:700;color:#04120F;background:linear-gradient(120deg,var(--brand-deep),var(--brand))}
.tile-no.is-accent{background:linear-gradient(120deg,#E39A3A,var(--accent));color:#1A1206}
.tile h3{font-size:19px;font-weight:600}
.tile p{color:var(--t2);font-size:15px;margin:0}
.tile-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:10px;border-top:1px solid var(--line)}
.tile-foot .badge{font-family:"JetBrains Mono","Roboto Mono",monospace;font-size:12px;color:var(--t3);letter-spacing:.04em}
.arrow{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;border:1px solid var(--line);color:var(--brand);transition:transform 180ms var(--ease),border-color 180ms var(--ease),background 180ms var(--ease)}
.tile:hover .arrow{transform:translate(2px,-2px);border-color:var(--line-brand);background:rgba(20,224,180,.08)}

/* ---------- bar compare ---------- */
.bar-list{display:flex;flex-direction:column;gap:20px}
.bar-row{display:grid;grid-template-columns:1fr;gap:12px;padding:18px 20px;border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.045),rgba(255,255,255,.015));transition:border-color 200ms var(--ease),transform 200ms var(--ease)}
.bar-row:hover{border-color:var(--line-brand);transform:translateY(-2px)}
@media(min-width:900px){.bar-row{grid-template-columns:210px 1fr;align-items:center;gap:24px}}
.bar-label span{display:block;font-size:15px;font-weight:600}
.bar-label em{font-style:normal;font-size:12px;color:var(--t3);letter-spacing:.04em}
.bar-pair{display:flex;flex-direction:column;gap:10px}
.bar-line{display:flex;align-items:center;gap:12px}
.bar-track{position:relative;flex:1 1 auto;height:12px;border-radius:999px;background:rgba(255,255,255,.05);overflow:hidden;min-width:80px}
.bar{height:100%;border-radius:999px;transition:width 700ms var(--ease)}
.bar-base{background:linear-gradient(90deg,#334654,#4C6474)}
.bar-opt{background:linear-gradient(90deg,var(--brand-deep),var(--brand));box-shadow:0 0 14px var(--brand-glow)}
.bar-val{flex:0 0 auto;width:84px;text-align:right;font-family:"JetBrains Mono","Roboto Mono",monospace;font-size:13px;color:var(--t2)}
.bar-val.is-brand{color:var(--brand)}
.legend{display:flex;flex-wrap:wrap;gap:18px;margin-top:20px;font-size:13px;color:var(--t2)}
.legend i{display:inline-block;width:22px;height:8px;border-radius:999px;margin-right:8px;vertical-align:middle}

/* ---------- metric strip ---------- */
.metric-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
@media(min-width:1024px){.metric-strip{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}}
.metric{position:relative;padding:22px 20px 20px;border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.05),rgba(255,255,255,.015));transition:transform 200ms var(--ease),border-color 200ms var(--ease),box-shadow 200ms var(--ease)}
.metric::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,var(--brand),transparent)}
.metric:hover{transform:translateY(-2px);border-color:var(--line-brand);box-shadow:var(--sh-1)}
.metric .num{font-family:"JetBrains Mono","Roboto Mono",monospace;font-size:clamp(26px,3.2vw,36px);font-weight:700;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.metric .num span{font-size:13px;color:var(--t3);margin-left:4px;font-weight:500}
.metric .lb{font-size:13px;color:var(--t2);margin-top:6px}
.metric .note{font-size:13px;color:var(--t3);margin-top:10px;line-height:1.7}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px;max-width:900px}
.faq-item{border-radius:var(--r-card);border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.05),rgba(255,255,255,.015));overflow:hidden;transition:border-color 200ms var(--ease),box-shadow 200ms var(--ease)}
.faq-item:hover{border-color:var(--line-brand)}
.faq-item.is-open{border-color:var(--line-brand);box-shadow:var(--sh-1)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;min-height:54px;text-align:left;font-size:16px;font-weight:600;color:var(--t1)}
.faq-ic{flex:0 0 auto;width:26px;height:26px;display:grid;place-items:center;border-radius:8px;border:1px solid var(--line-brand);color:var(--brand);transition:transform 200ms var(--ease),background 200ms var(--ease)}
.faq-item.is-open .faq-ic{transform:rotate(45deg);background:rgba(20,224,180,.12)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 260ms var(--ease)}
.faq-a-inner{padding:0 20px 20px;font-size:15px;color:var(--t2);line-height:1.85;border-top:1px solid var(--line);padding-top:16px;background:rgba(5,9,15,.35)}

/* ---------- related ---------- */
.related-links{display:flex;flex-wrap:wrap;gap:12px}
.link-chip{display:inline-flex;align-items:center;gap:9px;padding:11px 18px;border-radius:999px;border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));color:var(--t2);font-size:14px;transition:transform 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease),box-shadow 180ms var(--ease)}
.link-chip:hover{transform:translateY(-2px);color:var(--t1);border-color:var(--line-brand);box-shadow:var(--sh-1)}
.link-chip svg{color:var(--brand)}

/* ---------- CTA band ---------- */
.cta-band{border-radius:20px;border:1px solid var(--line-brand);background:linear-gradient(150deg,rgba(20,224,180,.12),rgba(16,27,39,.7) 46%,rgba(124,107,255,.10));backdrop-filter:blur(14px) saturate(140%);box-shadow:inset 0 1px 0 rgba(255,255,255,.08),var(--sh-2);padding:28px}
@media(min-width:768px){.cta-band{padding:40px}}
.cta-band-grid{display:grid;grid-template-columns:1fr;gap:24px;align-items:center}
@media(min-width:900px){.cta-band-grid{grid-template-columns:1.5fr auto;gap:36px}}
.cta-band h2{font-size:clamp(22px,2.6vw,30px)}
.cta-band p{color:var(--t2);font-size:15px;margin-top:10px;max-width:620px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- footer ---------- */
.footer{margin-top:0;padding:56px 0 24px;border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(8,14,22,.6),rgba(5,9,15,.95))}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;padding-bottom:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 40px}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}}
.footer h4{font-size:14px;letter-spacing:.06em;color:var(--t1);margin-bottom:16px}
.footer p{color:var(--t3);font-size:14px;line-height:1.8;max-width:340px}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.footer-links li{margin-bottom:10px}
.footer-links a{color:var(--t2);font-size:14px;display:inline-block;transition:color 180ms var(--ease),transform 180ms var(--ease)}
.footer-links a:hover{color:var(--brand);transform:translateX(2px)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;padding-top:22px;border-top:1px solid var(--line);font-size:13px;color:var(--t3)}
.to-top{display:inline-flex;align-items:center;gap:7px;color:var(--t2);transition:color 180ms var(--ease),transform 180ms var(--ease)}
.to-top:hover{color:var(--brand);transform:translateY(-1px)}

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