*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #4f46e5;--primary-dark: #3730a3;--primary-light: #e0e7ff;--secondary: #6b7280;--bg: #f8fafc;--surface: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--radius: 12px;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06)}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}button{cursor:pointer;font-family:inherit}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;font-size:.9rem;font-weight:500;border:none;transition:background .2s,transform .1s}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.btn-primary{background:var(--primary);color:#fff}.btn.btn-primary:hover:not(:disabled){background:var(--primary-dark)}.btn.btn-secondary{background:var(--border);color:var(--secondary)}.btn.btn-secondary:hover:not(:disabled){background:#cbd5e1}