:root{--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--danger-hover: #b91c1c;--background: #f8fafc;--surface: #ffffff;--border: #e2e8f0;--text-primary: #1e293b;--text-secondary: #64748b}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.5;color:var(--text-primary);background:var(--background);-webkit-font-smoothing:antialiased}a{color:var(--primary)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.5rem 1rem;font-size:.875rem;font-weight:500;font-family:inherit;border-radius:6px;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:background .2s,border-color .2s,opacity .2s;line-height:1.5}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover:not(:disabled){background:var(--primary-hover);border-color:var(--primary-hover)}.btn-outline{background:var(--surface);color:var(--text-primary);border-color:var(--border)}.btn-outline:hover:not(:disabled){background:var(--background);border-color:var(--text-secondary)}.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}.btn-danger:hover:not(:disabled){background:var(--danger-hover);border-color:var(--danger-hover)}.btn-sm{padding:.3rem .65rem;font-size:.8rem}.alert{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;margin-bottom:1.5rem}.alert-error{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}