:root{--bg:#f5f6fa;--card:#fff;--ink:#1c2230;--muted:#6b7385;--line:#e3e6ee;--brand:#2b4bd6;--red:#c62828;--green:#1b7a3d}@media (prefers-color-scheme: dark){:root{--bg:#12151d;--card:#1b2030;--ink:#e8ebf3;--muted:#9aa3b8;--line:#2b3248;--brand:#7b93ff;--red:#ff7b7b;--green:#5fd48a}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.45 system-ui,sans-serif}header{display:flex;align-items:center;gap:16px;padding:10px 20px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0}nav{display:flex;gap:4px;flex:1}main{padding:20px;max-width:1200px;margin:auto}.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px}button{background:var(--brand);color:#fff;border:0;border-radius:6px;padding:7px 12px;cursor:pointer;font:inherit}button:disabled{opacity:.5;cursor:default}button.ghost{background:transparent;color:var(--brand);border:1px solid 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