:root{--primary: #2563eb;--primary-dark: #1d4ed8;--secondary: #64748b;--success: #22c55e;--bg: #f8fafc;--surface: #ffffff;--text: #0f172a;--text-light: #64748b;--border: #e2e8f0;--danger: #ef4444}@media (prefers-color-scheme: dark){:root{--bg: #0f172a;--surface: #1e293b;--text: #f1f5f9;--text-light: #94a3b8;--border: #334155}}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{margin:0;font-family:Inter,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}#root{max-width:600px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column}.header{padding:1rem;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:1rem;position:sticky;top:0;z-index:10}.header h1{font-size:1.25rem;margin:0;flex:1}.main-content{padding:1rem;flex:1;display:flex;flex-direction:column;gap:1rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.5rem;box-shadow:0 1px 3px 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