:root{--bg: #f6f7f9;--surface: #ffffff;--surface-2: #f0f2f5;--border: #e2e5ea;--text: #1a1d21;--text-muted: #666d78;--accent: #3b5bdb;--accent-soft: #e7ecfd;--danger: #d64545;--ok: #2f9e44;--warn: #e8940c;--radius: 10px;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);color-scheme:light}:root[data-theme=dark]{--bg: #14161a;--surface: #1c1f26;--surface-2: #23262e;--border: #2e323b;--text: #e8eaed;--text-muted: #9aa1ac;--accent: #6c8cff;--accent-soft: #23304f;color-scheme:dark}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14px}a{color:var(--accent)}button{font:inherit;cursor:pointer}.app{min-height:100vh}.topbar{display:flex;align-items:center;gap:24px;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.brand{font-weight:700;font-size:16px}.nav{display:flex;gap:4px}.nav a{padding:6px 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