/* ==========================================================================
   CSS TỐI ƯU CHO TRANG CHI TIẾT SẢN PHẨM (VIFASO)
   ========================================================================== */

.product-detail-wrapper {
    background-color: #f8fafc;
    font-family: 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    padding: 30px 20px;
}

.product-detail-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Breadcrumb */
.detail-breadcrumb {
    font-size: 13px;
    color: #64748b;
    margin-bottom: 20px;
}

.detail-breadcrumb a {
    color: #2563eb;
    text-decoration: none;
}

.detail-breadcrumb span {
    color: #0f172a;
    font-weight: 600;
}

/* Khung chính chi tiết sản phẩm */
.main-product-box {
    background: #fff;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    padding: 30px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

/* CỘT TRÁI: HÌNH ẢNH SẢN PHẨM */
.product-img-main-box {
    background: #f1f5f9;
    border-radius: 8px;
    height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid #cbd5e1;
    margin-bottom: 15px;
    position: relative;
}

.product-main-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-img-fallback {
    font-size: 60px;
    color: #16a34a;
}

.product-thumbnails-list {
    display: flex;
    gap: 10px;
    overflow-x: auto;
}

.thumb-img {
    width: 70px;
    height: 70px;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
    cursor: pointer;
    transition: border-color 0.2s;
}

.thumb-img:hover {
    border-color: #2563eb;
}

/* CỘT PHẢI: THÔNG TIN & ĐẶT HÀNG */
.product-brand-tag {
    background: #dbeafe;
    color: #1d4ed8;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
    margin-bottom: 10px;
}

.product-title {
    font-size: 24px;
    font-weight: 800;
    color: #0f172a;
    margin: 0 0 10px 0;
}

.product-meta-sku {
    font-size: 13px;
    color: #64748b;
    margin-bottom: 15px;
}

.product-meta-sku strong {
    color: #334155;
}

.product-price-box {
    font-size: 26px;
    font-weight: 800;
    color: #16a34a;
    margin-bottom: 20px;
}

/* Biến thể sản phẩm (Options) */
.product-options-section {
    margin-bottom: 20px;
    border-top: 1px solid #f1f5f9;
    padding-top: 15px;
}

.options-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: #334155;
    margin-bottom: 8px;
}

.options-grid {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.option-item {
    border: 1px solid #cbd5e1;
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    background: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
}

.option-item img {
    width: 24px;
    height: 24px;
    object-fit: cover;
    border-radius: 4px;
}

.option-price-adj {
    color: #16a34a;
    font-weight: 600;
}

/* Nút thao tác mua hàng / liên hệ */
.product-action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn-hotline {
    flex: 1;
    background: #16a34a;
    color: #fff;
    text-align: center;
    padding: 14px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 15px;
    box-shadow: 0 2px 4px rgba(22, 163, 74, 0.2);
}

.btn-quote {
    background: #f1f5f9;
    color: #334155;
    border: 1px solid #cbd5e1;
    text-align: center;
    padding: 14px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
}

/* THÔNG SỐ KỸ THUẬT & MÔ TẢ CHI TIẾT LAYOUT 2 CỘT */
.product-bottom-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}

.card-box {
    background: #fff;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    padding: 25px;
}

.card-box-title {
    font-size: 16px;
    font-weight: 700;
    color: #0f172a;
    margin-top: 0;
    margin-bottom: 15px;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 8px;
}

.description-content {
    font-size: 14px;
    color: #334155;
    line-height: 1.7;
}

.specs-list {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
    font-size: 13px;
    color: #334155;
}

.specs-item {
    padding: 8px 0;
    border-bottom: 1px solid #f1f5f9;
    display: flex;
    justify-content: space-between;
}

.specs-item.no-border {
    border-bottom: none;
}

.specs-label {
    color: #64748b;
}

.specs-value {
    color: #0f172a;
}

.datasheet-btn {
    display: block;
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
    text-align: center;
    padding: 10px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
}

/* Responsive */
@media screen and (max-width: 992px) {
    .main-product-box {
        grid-template-columns: 1fr;
    }
    .product-bottom-grid {
        grid-template-columns: 1fr;
    }
}