/* ============================================================
   AURELUX — shared design system (Style A "Obsidian Glow")
   全站唯一共享样式。设计令牌改动只在此处。
   数据底稿：_数据底稿.md
   ============================================================ */
:root{
  --bg:#0D0E11;
  --bg2:#14161B;
  --panel:#14161B;
  --line:#262A33;
  --line-strong:#3A4150;
  --text:#EDEBE5;
  --muted:#A3A8B3;
  --accent:#E8A33D;
  --accent-soft:#F5D9A8;
  --accent-ink:#141008;
  --ok:#7FB069;
  --maxw:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font:15px/1.65 "Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
section{padding:64px 0;border-top:1px solid var(--line)}
.ic{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;vertical-align:-3px;flex:none}

/* ---------- typography ---------- */
.kicker{color:var(--accent);font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;margin-bottom:12px}
h1{font-size:42px;line-height:1.14;font-weight:650;letter-spacing:-.02em}
h2{font-size:26px;font-weight:600;letter-spacing:-.01em;margin-bottom:8px}
h3{font-size:16px;font-weight:600}
.sub{color:var(--muted);max-width:640px;margin-bottom:36px}
.lead{font-size:17px;color:var(--muted)}
p a,.txt a{color:var(--accent-soft);border-bottom:1px solid var(--line-strong)}
.note{font-size:12.5px;color:var(--muted)}

/* ---------- top bar ---------- */
.top{position:sticky;top:0;z-index:10;background:rgba(13,14,17,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(4px)}
.top .wrap{display:flex;align-items:center;gap:26px;height:60px}
.logo{font-weight:700;letter-spacing:.22em;font-size:15px;white-space:nowrap}
.logo b{color:var(--accent)}
nav.main{display:flex;gap:20px;font-size:13.5px;color:var(--muted);flex:1}
nav.main a:hover{color:var(--text)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--text);padding:7px 10px;cursor:pointer}
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--accent);color:var(--accent);padding:8px 16px;font-size:13.5px;font-weight:600;cursor:pointer}
.btn:hover{background:var(--accent);color:var(--accent-ink)}
.btn-solid{background:var(--accent);color:var(--accent-ink)}
.btn-solid:hover{background:var(--accent-soft);border-color:var(--accent-soft)}
.btn-lg{padding:12px 24px;font-size:14.5px}

/* ---------- hero ---------- */
.hero{border-top:none;padding:80px 0 72px;position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{margin:18px 0 28px;max-width:500px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-meta{margin-top:28px;font-size:13px;color:var(--muted)}
.hero-art svg{width:100%;height:auto;display:block}

/* ---------- page hero (内页) ---------- */
.page-hero{border-top:none;padding:54px 0 46px;background:linear-gradient(180deg,#121318 0%,var(--bg) 100%)}
.crumbs{font-size:12.5px;color:var(--muted);margin-bottom:16px}
.crumbs a:hover{color:var(--text)}
.crumbs .sep{margin:0 7px;color:var(--line-strong)}
.page-hero h1{font-size:34px}
.page-hero .sub{margin:14px 0 0;max-width:680px}
.page-hero .kicker{margin-bottom:10px}

/* ---------- grids & cards ---------- */
.grid5{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.scene{border:1px solid var(--line);background:var(--bg2);padding:22px 18px;display:block}
.scene:hover{border-color:var(--accent)}
.scene .ic{width:22px;height:22px;color:var(--accent)}
.scene h3{margin:14px 0 6px}
.scene p{font-size:12.5px;color:var(--muted);line-height:1.55}
.card{border:1px solid var(--line);background:var(--bg2);padding:24px 22px}
.card:hover{border-color:var(--accent)}
.card h3{margin:12px 0 10px}
.card ul{list-style:none;font-size:13.5px;color:var(--muted)}
.card ul li{padding:5px 0;display:flex;gap:9px;align-items:flex-start}
.card ul li .ic{width:15px;height:15px;margin-top:3px;color:var(--accent)}
.card .more{display:inline-block;margin-top:14px;font-size:13px;color:var(--accent);font-weight:600}
.card .cap{padding:18px}
.card .cap p{font-size:12.5px;color:var(--muted)}
.viz{height:110px;border-bottom:1px solid var(--line);position:relative;overflow:hidden;background:linear-gradient(180deg,#191C24,#12141A)}

/* ---------- number / stat strip ---------- */
.trust{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:34px 0}
.trust .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.trust b{display:block;font-size:26px;font-weight:650;color:var(--accent);letter-spacing:-.01em}
.trust span{font-size:12.5px;color:var(--muted)}
.trust .src{display:block;font-size:10.5px;color:#8A8F99;margin-top:3px}

/* ---------- tables ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:13.5px}
.tbl th{background:var(--bg2);color:var(--text);font-weight:600;text-align:left;padding:11px 14px;border:1px solid var(--line);font-size:12.5px;letter-spacing:.03em}
.tbl td{padding:11px 14px;border:1px solid var(--line);color:var(--muted);vertical-align:top}
.tbl td b{color:var(--text);font-weight:600}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line)}

/* ---------- two-col ---------- */
.two-col{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
.two-col .media{border:1px solid var(--line);background:var(--bg2)}

/* ---------- process steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line)}
.step{padding:22px 20px;border-right:1px solid var(--line);background:var(--bg2)}
.step:last-child{border-right:none}
.step .no{font-size:13px;color:var(--accent);font-weight:700;letter-spacing:.08em}
.step h3{margin:8px 0 6px;font-size:15px}
.step p{font-size:12.5px;color:var(--muted)}

/* ---------- FAQ ---------- */
details.faq{border:1px solid var(--line);background:var(--bg2);margin-bottom:10px}
details.faq summary{cursor:pointer;padding:15px 18px;font-weight:600;font-size:14.5px;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--accent);font-size:18px;font-weight:400}
details.faq[open] summary::after{content:"–"}
details.faq .a{padding:0 18px 16px;color:var(--muted);font-size:13.5px}

/* ---------- certs ---------- */
.certs{display:flex;gap:12px;flex-wrap:wrap;align-items:stretch}
.cert{border:1px solid var(--line);padding:10px 16px;font-size:13px;font-weight:600;letter-spacing:.06em;background:var(--bg2)}
.cert small{display:block;font-weight:400;color:var(--muted);font-size:11px;letter-spacing:0;margin-top:2px}
.badge{display:inline-block;border:1px solid var(--line);color:var(--muted);padding:3px 10px;font-size:11.5px;letter-spacing:.05em}
.badge-acc{border-color:var(--accent);color:var(--accent)}

/* ---------- forms ---------- */
.form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form .full{grid-column:1/-1}
.field label{display:block;font-size:12.5px;font-weight:600;letter-spacing:.04em;margin-bottom:6px;color:var(--text)}
.field input,.field select,.field textarea{width:100%;background:var(--bg2);border:1px solid var(--line);color:var(--text);padding:10px 12px;font:inherit;font-size:14px}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent)}
.field textarea{min-height:110px;resize:vertical}
.form .btn{justify-self:start}
.form-note{font-size:12px;color:var(--muted);grid-column:1/-1}

/* ---------- CTA band ---------- */
.cta-band{border-top:1px solid var(--line);padding:56px 0;background:var(--bg2)}
.cta-band .wrap{display:flex;gap:28px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cta-band h2{margin-bottom:4px}
.cta-band p{color:var(--muted);font-size:14px}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:44px 0 26px;font-size:13px;color:var(--muted);background:var(--bg2)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1.2fr;gap:28px;margin-bottom:34px}
.foot-grid h4{color:var(--text);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px}
.foot-grid ul{list-style:none}
.foot-grid li{margin-bottom:7px}
.foot-grid a:hover{color:var(--text)}
.foot-base{border-top:1px solid var(--line);padding-top:18px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12px}
.tag-demo{display:inline-block;border:1px solid var(--line);padding:2px 8px;font-size:11px;letter-spacing:.08em;color:var(--muted)}

/* ---------- article / content pages ---------- */
.article{max-width:760px}
.article h2{margin:36px 0 10px}
.article h3{margin:24px 0 8px}
.article p{margin:10px 0;color:var(--muted)}
.article ul,.article ol{margin:10px 0 10px 20px;color:var(--muted)}
.article li{margin:5px 0}
.article .tbl{margin:14px 0}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero .wrap,.two-col{grid-template-columns:1fr}
  .grid5{grid-template-columns:repeat(2,1fr)}
  .grid4{grid-template-columns:repeat(2,1fr)}
  .grid3{grid-template-columns:1fr}
  .trust .wrap{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .step:nth-child(2n){border-right:none}
  .step{border-bottom:1px solid var(--line)}
  nav.main{display:none;position:absolute;top:60px;left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--line);flex-direction:column;padding:14px 20px;gap:0}
  nav.main a{padding:11px 0;border-top:1px solid var(--line)}
  nav.main a:first-child{border-top:none}
  nav.main.open{display:flex}
  .nav-toggle{display:inline-flex}
  .top .wrap{position:relative}
  .top .btn{margin-left:0}
  h1{font-size:33px}
  .page-hero h1{font-size:28px}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:520px){
  .grid5,.grid4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .step{border-right:none}
  .trust .wrap{grid-template-columns:1fr 1fr}
  .form{grid-template-columns:1fr}
  .hero{padding:56px 0}
  .top .btn{display:none}
}