:root{--bg:#f6f7f9;--panel:#fff;--text:#1c1f24;--muted:#6b7280;--border:#e3e6ea;--accent:#2563eb;--accent-text:#fff;--danger:#dc2626;--soft:#eef2ff;--error-bg:#fef2f2;--error-text:#b91c1c;color:var(--text);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Hiragino Sans,Yu Gothic UI,Microsoft YaHei,sans-serif;font-size:14px}@media (prefers-color-scheme:dark){:root{--bg:#111317;--panel:#1a1d23;--text:#e6e8eb;--muted:#9aa1ad;--border:#2c3139;--accent:#3b82f6;--soft:#1e2a44;--error-bg:#3a1717;--error-text:#fca5a5}}*{box-sizing:border-box}body{margin:0}h1{margin:0 0 12px;font-size:18px}h2{margin:0 0 4px;font-size:18px}button,.btn{font:inherit;border:1px solid var(--border);background:var(--panel);color:var(--text);cursor:pointer;white-space:nowrap;border-radius:6px;padding:6px 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