:root{
  --bg:#f7f9fc;
  --ink:#0f172a;
  --muted:#5b6780;
  --primary:#2455ff;
  --accent:#0ea5e9;
  --card:#ffffff;
  --line:#e5eaf2;
  --shadow:0 16px 40px rgba(16,24,40,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block;border-radius:16px}
.wrap{width:min(1180px,92%);margin:0 auto}

.site-header{position:sticky;top:0;z-index:80;background:rgba(247,249,252,.88);backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--line)}
.progress{position:absolute;left:0;top:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));width:0}
.header-inner{display:flex;align-items:center;gap:18px;padding:14px 0}
.brand{display:flex;gap:12px;align-items:center}
.brand-mark{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,#1e3a8a,#60a5fa);color:#fff;display:grid;place-items:center;font-weight:700}
.brand-text strong{display:block;font-size:18px}
.brand-text span{font-size:12px;color:var(--muted)}
.nav{display:flex;gap:14px;margin-left:auto;flex-wrap:wrap}
.nav a{padding:8px 12px;border-radius:10px;color:var(--muted);font-size:14px}
.nav a.active,.nav a:hover{background:#eaf0ff;color:var(--primary)}
.reading{margin-left:12px;color:var(--muted);font-size:12px;background:#fff;padding:6px 10px;border-radius:999px;border:1px solid var(--line)}
.nav-toggle{display:none;margin-left:6px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:6px 10px}

.drawer{position:fixed;inset:0 0 auto auto;right:20px;top:80px;width:min(320px,90vw);background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:16px;transform:translateY(-10px);opacity:0;pointer-events:none;transition:.2s;z-index:9999}
.drawer.open{opacity:1;transform:translateY(0);pointer-events:auto}
.drawer-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.drawer-links{display:grid;gap:8px}
.drawer-links a{padding:10px 12px;border-radius:10px;background:#f1f5ff}
.drawer-cta{display:flex;gap:10px;margin-top:12px}
.scrim{position:fixed;inset:0;background:rgba(15,23,42,.2);opacity:0;pointer-events:none;transition:.2s;z-index:9998}
.scrim.show{opacity:1;pointer-events:auto}

.hero{padding:56px 0 30px;background:linear-gradient(180deg,#eef3ff,rgba(247,249,252,0))}
.hero.narrow{padding:46px 0 10px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:center}
.hero-copy h1{font-size:38px;line-height:1.2;margin:10px 0}
.hero-copy p{color:var(--muted);line-height:1.7}
.eyebrow{color:var(--primary);font-weight:600}
.btn-row{display:flex;gap:12px;margin:18px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:999px;border:1px solid var(--line);font-weight:600}
.btn.primary{background:var(--primary);color:#fff;border-color:transparent;box-shadow:0 12px 24px rgba(36,85,255,.2)}
.btn.ghost{background:#fff}
.tag-row{display:flex;gap:8px;flex-wrap:wrap}
.tag-row span{font-size:12px;padding:6px 10px;border-radius:999px;background:#f1f5ff;color:#2440a3}

.scene{padding:30px 0}
.scene-head h2{margin:0 0 8px}
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:16px}
.scene-card{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);transform-style:preserve-3d;transition:.3s}
.scene-body{padding:16px}
.scene-body h3{margin:4px 0 6px}
.scene-body p{color:var(--muted);font-size:14px;line-height:1.6}
.scene-body a{color:var(--primary);font-weight:600;position:relative}
.scene-body a:after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--primary);transition:.3s}
.scene-card:hover .scene-body a:after{width:100%}

.feature-rows{padding:20px 0 50px}
.feature{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:var(--shadow)}
.mini-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:10px}
.mini-grid div{background:#f3f6ff;padding:10px;border-radius:12px;font-size:13px;text-align:center}

.promo{padding:20px 0 60px}
.promo-card{background:linear-gradient(135deg,#1e3a8a,#2563eb);color:#fff;border-radius:22px;padding:28px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.promo-card p{color:#dbe7ff}

.matrix{padding:20px 0 50px}
.matrix table{width:100%;border-collapse:collapse;background:#fff;border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}
.matrix th,.matrix td{padding:14px;border-bottom:1px solid var(--line);text-align:left}
.matrix th{background:#f1f5ff}

.gallery{padding:10px 0 60px}
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}

.roadmap{padding:10px 0}
.roadmap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.road-step{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:var(--shadow)}
.road-step span{display:inline-block;background:#eaf0ff;color:#2440a3;padding:4px 8px;border-radius:999px;font-weight:600}

.pitfalls{padding:20px 0 50px}
.pitfall-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.pitfall-grid article{background:#fff;border-radius:16px;padding:16px;border:1px solid var(--line)}

.cta-wide{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;display:flex;align-items:center;justify-content:space-between;gap:14px;box-shadow:var(--shadow)}

.tabs{padding:20px 0 60px}
.tab-buttons{display:flex;gap:10px}
.tab-btn{padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:#fff}
.tab-btn.active{background:#1e40af;color:#fff;border-color:transparent}
.tab-panels{margin-top:16px}
.tab-panel{display:none;background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.tab-panel.active{display:block}
.checklist{list-style:none;padding:0;margin:10px 0}
.checklist li{padding:10px;border-bottom:1px dashed var(--line)}
.progress-wrap{margin-top:16px}
.progress-bar{height:10px;background:#e5eaf2;border-radius:999px;overflow:hidden}
.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,#2563eb,#38bdf8);width:0}

.help-tools{padding:10px 0}
.search-bar{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px}
.search-bar input{border:none;outline:none;width:100%;font-size:14px}
.filters{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.filter{padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:#fff}
.filter.active{background:#1e40af;color:#fff}

.help-grid{display:grid;gap:12px;margin:20px 0 60px}
.help-card{display:grid;grid-template-columns:220px 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}
.help-card h3{margin:4px 0}
.meta{display:flex;gap:12px;color:var(--muted);font-size:12px}

.release-filter{padding:10px 0}
.filter-row{display:flex;gap:12px;align-items:center}
.filter-row input{flex:1;border:1px solid var(--line);border-radius:999px;padding:10px 14px}
.year-filters{display:flex;gap:8px;flex-wrap:wrap}
.release-list{display:grid;gap:10px;padding:10px 0 60px}
.release-item{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:var(--shadow)}
.release-date{min-width:110px;color:var(--primary);font-weight:700}

.brand-sections{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;padding:10px 0 60px}
.brand-sections div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}

.support-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;padding:20px 0 60px}
.support-form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;display:grid;gap:12px;box-shadow:var(--shadow)}
.support-form input,.support-form select,.support-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px}
.support-flow{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.support-flow ol{padding-left:20px}

.legal{padding:40px 0 80px}
.article{padding:20px 0 60px}
.article p{line-height:1.8;color:var(--muted)}

.not-found{padding:80px 0;text-align:center}

.site-footer{background:#0f172a;color:#cbd5f5;padding:30px 0}
.footer-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px;align-items:start}
.foot-brand{display:flex;gap:10px;align-items:center}
.foot-brand .brand-mark{background:#1e3a8a}
.foot-links{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}
.foot-links a{color:#cbd5f5}
.foot-note p{margin:6px 0;color:#9fb0d6;font-size:13px}
.foot-copy{border-top:1px solid rgba(148,163,184,.2);margin-top:16px;padding-top:12px;color:#9fb0d6;font-size:12px}

.reveal{opacity:0;transform:translateY(18px) scale(.98);transition:.6s}
.reveal.show{opacity:1;transform:translateY(0) scale(1)}

@media (max-width:980px){
  .hero-grid,.feature,.support-grid{grid-template-columns:1fr}
  .scene-grid{grid-template-columns:1fr}
  .gallery-grid{grid-template-columns:repeat(2,1fr)}
  .roadmap-grid{grid-template-columns:repeat(2,1fr)}
  .pitfall-grid{grid-template-columns:repeat(2,1fr)}
  .help-card{grid-template-columns:1fr}
  .brand-sections{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .nav{display:none}
  .nav-toggle{display:inline-flex}
}
@media (max-width:600px){
  .hero-copy h1{font-size:28px}
  .promo-card{flex-direction:column;align-items:flex-start}
  .drawer{right:5%;left:5%}
}