:root{--bg: #f6f7f9;--panel: #ffffff;--text: #1d2430;--muted: #66707f;--line: #e3e7ee;--accent: #4550e5;--accent-soft: #eceeff;--ok: #1a9e5c;--warn: #c77800;--danger: #c43d3d;--radius: 10px}@media(prefers-color-scheme:dark){:root{--bg: #14171c;--panel: #1d2129;--text: #e8ebf0;--muted: #98a2b0;--line: #2c323d;--accent: #7c86ff;--accent-soft: #262b45}}*{box-sizing:border-box}body{margin:0;font:15px/1.5 system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--accent);text-decoration:none}h1{font-size:1.4rem;margin:0 0 4px}h2{font-size:1.05rem;margin:18px 0 8px}p.sub{color:var(--muted);margin:0 0 16px}.layout{display:flex;min-height:100vh}nav.side{width:210px;flex-shrink:0;padding:18px 12px;border-right:1px solid var(--line);background:var(--panel);position:sticky;top:0;height:100vh}nav.side .brand{font-weight:700;font-size:1.1rem;padding:4px 10px 16px}nav.side a{display:block;padding:8px 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