:root{--bg:#f5f5f7;--surface:#ffffff;--surface-2:#fbfbfd;--border:#d2d2d7;--border-soft:#e8e8ed;--text:#1d1d1f;--text-2:#6e6e73;--text-3:#8e8e93;--blue:#0071e3;--blue-hover:#0077ed;--red:#ff3b30;--green:#34c759;--yellow:#ffcc00;--shadow:0 1px 2px rgba(0,0,0,0.04),0 8px 24px rgba(0,0,0,0.06);--radius:18px}@media (prefers-color-scheme:dark){:root{--bg:#000000;--surface:#1c1c1e;--surface-2:#2c2c2e;--border:#38383a;--border-soft:#2c2c2e;--text:#f5f5f7;--text-2:#aeaeb2;--text-3:#8e8e93;--blue:#0a84ff;--blue-hover:#3b9bff;--red:#ff453a;--green:#30d158;--yellow:#ffd60a;--shadow:0 1px 2px rgba(0,0,0,0.3),0 8px 24px rgba(0,0,0,0.4)}}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,Segoe UI,system-ui,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.45}button,input,select{font:inherit;color:inherit}.shell{max-width:720px;margin:0 auto;padding:40px 20px 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