:root{color-scheme:light;--bg:#f5f6fb;--surface:#fff;--surface-2:#eef0f8;--text:#1b1f2a;--text-2:#4a5160;--muted:#8a91a0;--border:#e6e8f0;--border-strong:#d4d9e6;--accent:#5b6bfa;--accent-strong:#4453e6;--accent-soft:#eef0ff;--accent-2:#a855f7;--grad:linear-gradient(135deg, #5b6bfa, #a855f7);--good:#059669;--good-soft:#ecfdf5;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;--font-mono:ui-monospace, "SFMono-Regular", "Cascadia Code", "Consolas", "Liberation Mono", monospace;--container:1080px;--container-narrow:760px;--radius:14px;--radius-sm:9px;--shadow:0 1px 2px #1018280a, 0 4px 14px #1018280f;--shadow-lg:0 12px 28px #1018281f}[data-theme=dark]{color-scheme:dark;--bg:#0f1218;--surface:#171b24;--surface-2:#1f2530;--text:#e8eaf0;--text-2:#a6adbd;--muted:#6b7384;--border:#262c39;--border-strong:#353d4e;--accent:#8b96ff;--accent-strong:#a5aeff;--accent-soft:#232846;--accent-2:#c084fc;--grad:linear-gradient(135deg, #6d7bff, #b06df5);--good:#34d399;--good-soft:#123229;--shadow:0 1px 2px #0006, 0 4px 14px #00000059;--shadow-lg:0 12px 28px #00000080}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font-sans);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;margin:0;font-size:16px;line-height:1.75;transition:background .2s,color .2s}h1,h2,h3,h4,h5{letter-spacing:-.01em;color:var(--text);margin:0 0 .6em;font-weight:700;line-height:1.3}h1{font-size:clamp(1.7rem,4vw,2.4rem)}h2{margin-top:1.6em;font-size:clamp(1.3rem,3vw,1.7rem)}h3{margin-top:1.4em;font-size:1.2rem}p{margin:0 0 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