:root{--primary: oklch(52% .12 185);--primary-hover: oklch(45% .11 185);--accent: oklch(38% .08 225);--gradient: linear-gradient(135deg, var(--primary), var(--accent));--on-primary: #ffffff;--bg: #ffffff;--bg-soft: #f5f8f8;--bg-muted: #eef3f3;--text: #182226;--text-soft: #5a6b70;--border: #e0e8e9;--card: #ffffff;--shadow: 0 1px 3px rgb(16 32 36 / .06), 0 8px 24px rgb(16 32 36 / .05);--radius: .625rem;--font-zh: "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;--font-en: system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono: ui-monospace, "Cascadia Code", "SF Mono", Consolas, monospace}[data-theme=dark]{--primary: oklch(60% .12 185);--primary-hover: oklch(66% .12 185);--accent: oklch(45% .08 225);--on-primary: #ffffff;--bg: #0e1416;--bg-soft: #131b1d;--bg-muted: #1a2427;--text: #e6edee;--text-soft: #98a8ac;--border: #243034;--card: #151e21;--shadow: 0 1px 3px rgb(0 0 0 / .4), 0 8px 24px rgb(0 0 0 / .3)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font-zh);background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;transition:background-color .25s ease,color .25s ease}:lang(en) body{font-family:var(--font-en)}img{max-width:100%;height:auto;display:block}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1200px;margin:0 auto;padding:0 24px}.section{padding:88px 0}.section-soft{background:var(--bg-soft)}.section-head{margin-bottom:48px;max-width:760px}.tag{display:inline-block;font-size:.8125rem;font-weight:600;color:var(--primary);background:color-mix(in oklab,var(--primary) 12%,transparent);border:1px solid color-mix(in oklab,var(--primary) 28%,transparent);border-radius:999px;padding:2px 12px;margin-bottom:16px}.h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;line-height:1.3;margin:0 0 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var(--border)}.header-inner{display:flex;align-items:center;gap:20px;height:60px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.125rem;color:var(--text)}.brand:hover{text-decoration:none}.brand img{height:30px;width:auto}.nav-dropdown{position:relative}.nav-dropdown>summary{list-style:none;cursor:pointer;padding:8px 12px;border-radius:8px;color:var(--text-soft);font-size:.9375rem;font-weight:500;display:flex;align-items:center;gap:4px}.nav-dropdown>summary::-webkit-details-marker{display:none}.nav-dropdown>summary:after{content:"";border:4px solid transparent;border-top-color:currentColor;margin-top:3px}.nav-dropdown>summary:hover{color:var(--text);background:var(--bg-muted)}.nav-dropdown[open]>summary{color:var(--text)}.dropdown-menu{position:absolute;top:calc(100% + 6px);left:0;min-width:230px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:6px;z-index:60}.dropdown-menu 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