:root{--primary:#1e3a8a;--primary-light:#3b82f6;--secondary:#475569;--accent:#10b981;--danger:#ef4444;--background:#f8fafc;--surface:#fff;--text-main:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--radius:8px;--shadow:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--background);color:var(--text-main);font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5}button{cursor:pointer;border:none;font-family:inherit;transition:all .2s}.btn{border-radius:var(--radius);padding:.75rem 1.5rem;font-size:1rem;font-weight:600}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:#1e40af}.container{max-width:800px;margin:0 auto;padding:2rem}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border);padding:2rem}