.card {
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    padding: 20px;
}

.main-image {
    height: 480px;
    object-fit: contain;
    border-radius: 12px;
    background: #f1f3f5;
}

.thumbnail {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border: 3px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    margin: 5px;
    transition: 0.2s;
}

.thumbnail:hover, .thumbnail.active {
    border-color: #0d6efd;
    transform: scale(1.08);
}

.option-btn {
    padding: 5px 5px;
    border: 1.5px solid #ced4da;
    border-radius: 12px;
    margin: 2px 8px 2px 0;
    cursor: pointer;
    font-size: 0.95rem;
    min-width: 80px;
    text-align: center;
}

.option-btn.active {
    background: #0d6efd;
    color: white;
    border-color: #0d6efd;
}

.final-price {
    font-size: 2.2rem;
    font-weight: bold;
    color: #dc3545;
}

.original-price {
    font-size: 1.3rem;
    color: #6c757d;
    text-decoration: line-through;
}

.discount-badge {
    font-size: 1rem;
}

.stock-info {
    font-size: 0.9rem;
    margin-top: 8px;
    color: #495057;
}

.error-text {
    font-size: 0.85rem;
}

.add-to-cart-btn {
    height: 56px;
    font-size: 1.3rem;
    font-weight: 500;
}

.spec-item {
    margin-bottom: 12px;
    font-size: 1rem;
}