:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;--font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, monospace;--ink: #0b1020;--ink-soft: #475069;--ink-faint: #8a93a8;--brand: #2563eb;--brand-2: #7c3aed;--brand-grad: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);--accent: #06b6d4;--bg: #ffffff;--bg-soft: #f5f7fb;--bg-muted: #eef1f8;--line: #e6e9f2;--line-soft: #eef1f8;--card-bg: #ffffff;--input-bg: #f5f7fb;--menu-bg: #ffffff;--tag-bg: rgba(255, 255, 255, .92);--header-bg: rgba(255, 255, 255, .82);--footer-bg: #0b1020;--footer-text: #c7cddd;--footer-text-soft: #9aa2b8;--footer-text-faint: #7d8598;--footer-line: rgba(255, 255, 255, .1);--shadow-sm: 0 1px 2px rgba(11, 16, 32, .04);--shadow-md: 0 12px 30px -12px rgba(11, 16, 32, .18);--shadow-lg: 0 30px 60px -28px rgba(11, 16, 32, .28);--radius: 14px;--radius-lg: 22px;--maxw: 1200px;--header-h: 72px;--ease: cubic-bezier(.22, 1, 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a[aria-current=page]{color:var(--brand)}.header-actions{display:flex;align-items:center;gap:10px}.lang-select-wrap{position:relative;display:inline-flex;align-items:center}.lang-select{appearance:none;-webkit-appearance:none;padding:8px 30px 8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--bg-soft) url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a93a8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 12px center / 12px;color:var(--ink);font:inherit;font-size:.85rem;font-weight:600;cursor:pointer;transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}.lang-select:hover{border-color:var(--brand)}.lang-select:focus-visible{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px #2563eb26}.theme-toggle{flex:none;width:38px;height:38px;border-radius:11px;border:1px solid var(--line);background:var(--bg-soft);color:var(--ink-soft);display:grid;place-items:center;transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease)}.theme-toggle:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-1px)}.theme-toggle svg{width:18px;height:18px}.theme-toggle .icon-sun{display:none}html[data-theme=dark] .theme-toggle .icon-sun{display:block}html[data-theme=dark] .theme-toggle .icon-moon{display:none}.nav-toggle{display:none;width:42px;height:42px;border-radius:11px;border:1px solid var(--line);align-items:center;justify-content:center}.nav-toggle svg{width:20px;height:20px}.hero{position:relative;padding:clamp(64px,9vw,116px) 0 clamp(48px,7vw,96px);overflow:hidden}.hero:before{content:"";position:absolute;inset:-10% -10% auto auto;width:620px;height:620px;background:radial-gradient(circle at center,rgba(37,99,235,.16),rgba(124,58,237,.1) 45%,transparent 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