:root{--bg: #f6f7f9;--card: #ffffff;--text: #16191d;--muted: #6b7380;--border: #e2e5ea;--accent: #0f766e;--accent-text: #ffffff;--danger: #b42318;color-scheme:light dark}@media (prefers-color-scheme: dark){:root{--bg: #0e1114;--card: #171b20;--text: #e8eaed;--muted: #8b94a1;--border: #272d35;--accent: #2dd4bf;--accent-text: #04201c;--danger: #f97066}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.45 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}h1,h2{margin:0}h1{font-size:1.25rem}h2{font-size:1.05rem;margin-bottom:12px}a{color:var(--accent)}.center{min-height:100vh;display:grid;place-items:center;padding:16px}.app{max-width:760px;margin:0 auto;padding:0 16px 48px}main{display:grid;gap:16px}.topbar{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:16px 0}.topbar h1{margin-right:auto}.tabs{display:flex;gap:4px}.tabs button{border:0;background:transparent;color:var(--muted);padding:6px 12px;border-radius:8px}.tabs 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