:root{--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--paper:#f3f4f6;--board:#111827;--flap:#fbbf24;--max:1180px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 36px));margin:0 auto}
.flap-bar{background:var(--board);color:var(--flap);padding:10px 0;font-size:12px;font-weight:800;letter-spacing:.08em}
.flap-bar .container{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.flap-live{font-variant-numeric:tabular-nums}
.lock-btn{border:1px solid var(--flap);background:transparent;color:var(--flap);padding:6px 12px;font-weight:800;cursor:pointer;font-size:12px}
body.is-locked .lock-btn{background:var(--flap);color:var(--board)}
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:80}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:64px;flex-wrap:wrap}
.brand{font-weight:900}
.brand em{font-style:normal;color:#d97706;font-size:12px;margin-left:8px}
.nav-mini{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 16px;border:1px solid transparent;font-weight:800;font-size:14px;cursor:pointer}
.btn-ink{background:var(--ink);color:#fff}
.btn-gold{background:#d97706;color:#fff}
.btn-ghost{background:#fff;border-color:var(--line)}
section{padding:56px 0;scroll-margin-top:72px}
.kicker{display:block;font-size:11px;font-weight:900;letter-spacing:.14em;color:#d97706;margin-bottom:8px}
.section-head h2{font-size:clamp(24px,3.2vw,36px);line-height:1.2;margin-bottom:10px}
.section-head p{color:var(--muted);max-width:640px}
.footer{padding:48px 0 22px;background:var(--board);color:#d1d5db}
.footer-grid{display:grid;grid-template-columns:1.3fr .8fr .9fr;gap:24px}
.footer h3,.footer h4{margin-bottom:12px;font-size:16px;color:#fff}
.footer p,.footer a,.footer li{color:#9ca3af;font-size:14px}
.footer ul{list-style:none;display:grid;gap:8px}
.copyright{margin-top:28px;padding-top:16px;border-top:1px solid #374151;font-size:12px;color:#6b7280}
@media(max-width:720px){.footer-grid{grid-template-columns:1fr}}
img[data-src]{min-height:120px;background:rgba(128,128,128,.08)}
.below-fold{content-visibility:auto;contain-intrinsic-size:auto 480px}