* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', system-ui; background: #f4f7fc; }
.container { max-width: 1200px; margin: 0 auto; }
.card { background: white; border-radius: 16px; padding: 1.5rem; box-shadow: 0 2px 8px rgba(0,0,0,0.1); margin-bottom: 1.5rem; }
.btn, button, input[type="submit"] {
    background: #2c3e66; color: white; border: none; padding: 0.6rem 1.2rem;
    border-radius: 8px; cursor: pointer; font-weight: 600;
}
.btn-sm { padding: 0.3rem 0.8rem; font-size: 0.8rem; }
.btn-danger { background: #c0392b; }
.alert { padding: 0.8rem; border-radius: 8px; margin-bottom: 1rem; }
.success { background: #d4edda; color: #155724; }
.error { background: #f8d7da; color: #721c24; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 0.75rem; border-bottom: 1px solid #dee2e6; text-align: left; }