* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}

.header {
    background: #111827;
    color: white;
    padding: 24px 0;
    margin-bottom: 24px;
}

.header h1 {
    margin: 0;
    font-size: 28px;
}

.header p {
    margin: 6px 0 0;
    color: #d1d5db;
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
}

.layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    align-items: start;
}

.products-section h2,
.cart-section h2 {
    margin-top: 0;
    margin-bottom: 16px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.product-card,
.cart-section {
    background: white;
    border-radius: 12px;
    padding: 18px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
}

.product-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 240px;
}

.product-card h3 {
    margin-top: 0;
    margin-bottom: 10px;
}

.description {
    color: #6b7280;
    font-size: 14px;
    min-height: 40px;
}

.price {
    font-size: 20px;
    font-weight: bold;
    margin: 10px 0 6px;
    color: #111827;
}

.stock {
    color: #4b5563;
    font-size: 14px;
}

.product-form {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.quantity-input {
    width: 70px;
    padding: 10px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
}

.btn {
    border: none;
    border-radius: 8px;
    padding: 10px 14px;
    cursor: pointer;
    font-weight: 600;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
}

.btn-danger {
    background: #dc2626;
    color: white;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-success {
    background: #16a34a;
    color: white;
}

.btn-success:hover {
    background: #15803d;
}

.full-width {
    width: 100%;
}

.cart-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 12px;
}

.cart-item-title {
    margin: 0;
    font-weight: bold;
}

.cart-item-subtitle {
    margin: 4px 0 0;
    color: #6b7280;
    font-size: 14px;
}

.cart-summary {
    border-top: 1px solid #e5e7eb;
    padding-top: 14px;
    margin-top: 14px;
    margin-bottom: 16px;
    font-size: 16px;
}

.empty-cart {
    padding: 20px;
    background: #f9fafb;
    border: 1px dashed #d1d5db;
    border-radius: 10px;
    text-align: center;
    color: #6b7280;
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

.flash-container {
    margin-bottom: 20px;
}

.flash-message {
    padding: 14px 16px;
    border-radius: 10px;
    margin-bottom: 12px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.flash-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}

.flash-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}