:root{--brand:#4216fb;--brand-2:#7c3aed;--ink:#101a3d;--muted:#5b6478;--faint:#8a91a6;--bg:#f6f7fb;--surface:#fff;--line:#e6e8f0;--grad:linear-gradient(120deg,#4216fb,#7c3aed 55%,#00c2ff);--radius:14px;--shadow:0 1px 2px rgba(16,26,61,.04),0 6px 20px rgba(16,26,61,.06);--shadow-lg:0 12px 40px rgba(66,22,251,.14)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,segoe ui,pingfang sc,hiragino sans gb,microsoft yahei,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased}.wrap{max-width:1120px;margin:0 auto;padding:0 24px}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;height:64px}.brand{display:flex;align-items:center;gap:12px}.brand 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12px;border-radius:10px;transition:background .12s}.search-results a:hover,.search-results a.sel{background:rgba(66,22,251,7%)}.search-results .r-t{font-size:14.5px;font-weight:600;color:var(--ink)}.search-results .r-s{font-size:11.5px;font-weight:700;color:var(--brand);margin-top:1px}.search-results .r-d{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.search-results mark{background:rgba(255,180,0,.35);color:inherit;border-radius:3px;padding:0 1px}.search-empty{padding:28px;text-align:center;color:var(--faint);font-size:14px}.search-foot{padding:8px 16px;font-size:11.5px;color:var(--faint);border-top:1px solid var(--line);background:var(--bg)}.hero{position:relative;padding:84px 0 76px;text-align:center;background:radial-gradient(700px 320px at 15% 0%,rgba(66,22,251,.12),transparent 60%),radial-gradient(700px 320px at 85% 10%,rgba(0,194,255,.12),transparent 60%)}.hero h1{font-size:46px;line-height:1.2;font-weight:800;letter-spacing:-1px}.hero .sub{max-width:620px;margin:16px auto 0;font-size:17px;color:var(--muted)}.hero-actions{display:flex;gap:14px;justify-content:center;margin-top:32px;flex-wrap:wrap}.btn{display:inline-block;padding:13px 28px;border-radius:12px;font-weight:600;font-size:15px;transition:transform .15s,box-shadow .2s;border:1px solid transparent}.btn:hover{transform:translateY(-2px)}.btn-primary{color:#fff;background:var(--grad);box-shadow:0 10px 26px rgba(66,22,251,.32)}.btn-ghost{color:var(--ink);background:var(--surface);border-color:var(--line);box-shadow:var(--shadow)}.btn-ghost:hover{border-color:rgba(66,22,251,.4);color:var(--brand)}section{padding:68px 0}.sec-head{text-align:center;max-width:680px;margin:0 auto 44px}.sec-tag{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:1.5px;color:var(--brand);text-transform:uppercase;background:rgba(66,22,251,8%);padding:5px 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24px;margin-top:8px;background:linear-gradient(180deg,transparent,rgba(66,22,251,6%))}.help-block h3{font-size:24px;font-weight:800}.help-block p{color:var(--muted);margin-top:8px;font-size:15px}.help-block .btn{margin:22px 8px 0}footer.site{background:var(--ink);color:#c7cbe0;padding:40px 0 32px}.footer-inner{display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center}.footer-inner .social{display:flex;gap:14px}.footer-inner .social a{width:38px;height:38px;border-radius:10px;background:rgba(255,255,255,8%);display:grid;place-items:center;transition:background .15s,transform .15s}.footer-inner .social a:hover{background:var(--brand);transform:translateY(-2px)}.footer-inner .social img{width:20px;height:20px}.footer-inner .copy{font-size:13px;color:var(--faint)}@media(max-width:860px){.grid-3{grid-template-columns:1fr 1fr}.grid-2{grid-template-columns:1fr}.hero h1{font-size:34px}.sec-head h2{font-size:26px}.page-head h1{font-size:30px}.nav-links{display:none}.nav 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var(--line);border-radius:12px;box-shadow:var(--shadow-lg);padding:6px;z-index:60;animation:langIn .15s ease}.lang-menu[hidden]{display:none}@keyframes langIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}.lang-opt{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 12px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:600;white-space:nowrap;transition:all .15s}.lang-opt:hover{background:rgba(66,22,251,6%);color:var(--brand)}.lang-opt.cur{color:var(--brand);background:rgba(66,22,251,8%)}.lang-opt.cur::after{content:"✓";font-weight:700}@media(max-width:960px){.lang-menu{right:-8px}}