:root {
    --primary: #2563eb;
    --danger: #ef4444;
    --success: #10b981;
    --dark: #0f172a;
    --light: #f8fafc;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
body { font-family: 'Inter', system-ui, sans-serif; background: var(--light); color: var(--dark); margin: 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.navbar { background: var(--white); padding: 1rem 0; box-shadow: var(--shadow); position: sticky; top: 0; z-index: 100; }
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); text-decoration: none; }
.nav-links a { margin-left: 20px; text-decoration: none; color: #64748b; font-weight: 500; transition: 0.3s; }
.nav-links a:hover { color: var(--primary); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.grid-admin { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 30px; }
.card { background: white; padding: 25px; border-radius: 12px; box-shadow: var(--shadow); border: 1px solid #e2e8f0; }

input, select, textarea { width: 100%; padding: 12px; margin: 8px 0; border: 1px solid #ddd; border-radius: 8px; box-sizing: border-box; font-size: 1rem; }
.btn { background: var(--primary); color: white; border: none; padding: 12px 20px; border-radius: 8px; cursor: pointer; font-weight: 600; text-decoration: none; display: inline-block; text-align: center; }
.btn:hover { opacity: 0.9; }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; }
.btn-danger { background: var(--danger); }
.btn-success { background: var(--success); }

table { width: 100%; border-collapse: collapse; margin-top: 15px; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid #eee; }
th { background: #f1f5f9; }
.alert { padding: 15px; border-radius: 8px; margin-bottom: 20px; font-weight: 500; }
.alert-error { background: #fee2e2; color: #b91c1c; }

.product-img { width: 100%; height: 200px; object-fit: cover; border-radius: 8px; }