:root{--brand-50:#f0f9ff;--brand-100:#e0f2fe;--brand-200:#bae6fd;--brand-300:#7dd3fc;--brand-400:#38bdf8;--brand-500:#0ea5e9;--brand-600:#0284c7;--brand-700:#0369a1;--brand-800:#075985;--brand-900:#0c4a6e;--ink:#0c4a6e;--ink-body:#1e5c86;--ink-muted:#4a7695;--surface:#fff;--surface-2:#f7fbfe;--line:#d7e7f2;--line-soft:#e8f2f9;--success:#0f8a5f;--warn:#b45309;--font-sans:"Inter", "HarmonyOS Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;--container:1200px;--radius-sm:8px;--radius:12px;--radius-lg:18px;--shadow-xs:0 1px 2px #0c4a6e0f;--shadow-sm:0 2px 8px #0c4a6e0f;--shadow-md:0 8px 24px #0c4a6e14;--shadow-lg:0 18px 48px #0c4a6e1f;--z-header:20;--z-topbar:10;--z-panel:30;--z-skip:50;--ease:cubic-bezier(.22, .61, .36, 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18px;position:absolute;top:-100px;left:16px}.skip-link:focus{color:#fff;top:12px}.icon-sprite{width:0;height:0;position:absolute;overflow:hidden}.ico{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.18em;flex:none;width:1.15em;height:1.15em}.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:24px}.container--narrow{max-width:860px}.btn{border-radius:var(--radius-sm);cursor:pointer;white-space:nowrap;min-height:44px;transition:background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:10px 22px;font-family:inherit;font-size:15px;font-weight:500;line-height:1.2;display:inline-flex}.btn--lg{min-height:50px;padding:13px 28px;font-size:16px}.btn--block{width:100%}.btn--primary{background:var(--brand-700);color:#fff;box-shadow:var(--shadow-xs)}.btn--primary:hover{background:var(--brand-800);color:#fff;box-shadow:var(--shadow-sm)}.btn--primary:active{background:var(--ink)}.btn--outline{color:var(--brand-700);border-color:var(--brand-200);background:0 0}.btn--outline:hover{background:var(--brand-50);border-color:var(--brand-400);color:var(--brand-800)}.btn--ghost{color:var(--ink-body);background:0 0}.btn--ghost:hover{background:var(--brand-50);color:var(--brand-700)}.topbar{z-index:var(--z-topbar);background:var(--brand-900);color:#cde9fb;font-size:13px;position:relative}.topbar__inner{flex-wrap:wrap;align-items:center;gap:16px;min-height:38px;display:flex}.topbar__note{align-items:center;gap:7px;display:inline-flex}.site-header{z-index:var(--z-header);-webkit-backdrop-filter:saturate(180%)blur(12px);transition:border-color .25s var(--ease), box-shadow .25s 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