/* ========================================
   PRODUCT MAIN LAYOUT
======================================== */
.single-product { background: var(--color-white); }

.breadcrumb-bar { padding: 4px 0; border-bottom: 1px solid var(--color-border); }

.product-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

/* ========================================
   GALLERY
======================================== */
.product-gallery {
    position: sticky;
    top: calc(var(--header-height) + 20px);
}

.gallery-main {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg);
    aspect-ratio: 1;
    margin-bottom: 12px;
}

.gallery-main__slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

.gallery-main__slide.active {
    opacity: 1;
    pointer-events: auto;
}

.gallery-main__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-zoom {
    position: absolute;
    bottom: 12px;
    right: 12px;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(4px);
    color: var(--color-text);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid var(--color-border);
    transition: var(--transition-fast);
}

.gallery-zoom:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.gallery-thumbs {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
}

.gallery-thumb {
    flex-shrink: 0;
    width: 72px;
    height: 72px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
    background: var(--color-bg);
    position: relative;
}

.gallery-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-thumb.active,
.gallery-thumb:hover {
    border-color: var(--color-secondary);
}

.gallery-thumb--video {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 1.2rem;
}

/* ========================================
   PRODUCT INFO
======================================== */
.product-terms {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.term-badge {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 100px;
    letter-spacing: 0.05em;
}

.term-badge--dip {
    background: var(--color-secondary-light);
    color: var(--color-secondary);
}

.term-badge--col {
    background: var(--color-bg);
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
}

.product-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 12px;
    line-height: 1.3;
}

.product-rating-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
}

.product-views {
    font-size: 0.8rem;
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    gap: 5px;
    margin-left: auto;
}

/* Price */
.product-price-block {
    margin-bottom: 20px;
    padding: 20px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-secondary);
}

.product-price-sale {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-red);
    font-family: var(--font-heading);
    line-height: 1;
    margin-bottom: 6px;
}

.product-price-current {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-secondary);
    font-family: var(--font-heading);
}

.product-price-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.product-price-original {
    font-size: 1rem;
    color: var(--color-text-muted);
    text-decoration: line-through;
}

.product-price-save {
    font-size: 0.82rem;
    color: var(--color-red);
    font-weight: 600;
    background: var(--color-red-light);
    padding: 3px 10px;
    border-radius: 4px;
}

/* Short desc */
.product-short-desc {
    margin-bottom: 20px;
}

.product-short-desc p {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--color-text-light);
}

/* Features */
.product-features {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.product-features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.88rem;
    line-height: 1.5;
}

.product-features li i {
    color: var(--color-secondary);
    margin-top: 3px;
    flex-shrink: 0;
    font-size: 0.85rem;
}

/* Actions */
.product-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.product-btn-main {
    width: 100%;
    justify-content: center;
    font-size: 1rem;
    padding: 16px 24px;
}

.product-btn-main:hover { box-shadow: var(--shadow-gold); }

.product-actions .btn-outline {
    justify-content: center;
}

/* Guarantees */
.product-guarantees {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 20px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border: 1px solid var(--color-border);
}

.guarantee-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.guarantee-item i {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--color-secondary-light);
    color: var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.guarantee-item div {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.guarantee-item strong {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--color-primary);
}

.guarantee-item span {
    font-size: 0.78rem;
    color: var(--color-text-light);
}

/* Share */
.product-share {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.share-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid var(--color-border);
}

.share-btn--fb { background: #1877F2; color: white; border-color: #1877F2; }
.share-btn--zalo { background: #0068FF; color: white; border-color: #0068FF; }
.share-btn--copy { background: var(--color-bg); color: var(--color-text-light); }

.share-btn:hover { transform: scale(1.1); box-shadow: var(--shadow-sm); }

/* ========================================
   PRODUCT TABS
======================================== */
.product-tabs-section {
    padding: 40px 0 60px;
}

.tabs-nav {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--color-border);
    margin-bottom: 36px;
    overflow-x: auto;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-light);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
    background: none;
}

.tab-btn.active,
.tab-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-secondary);
}

.tab-count {
    background: var(--color-bg);
    color: var(--color-text-light);
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 100px;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Detail content */
.detail-content { display: grid; grid-template-columns: 1fr 300px; gap: 40px; }

.detail-main { font-size: 0.95rem; line-height: 1.8; color: var(--color-text); }

.detail-main p  { margin-bottom: 16px; }
.detail-main h2, .detail-main h3 { margin: 24px 0 12px; }
.detail-main img { border-radius: var(--radius-md); margin: 16px 0; }

.specs-table { width: 100%; border-collapse: collapse; }

.specs-table tr { border-bottom: 1px solid var(--color-border); }
.specs-table td {
    padding: 10px 14px;
    font-size: 0.87rem;
}
.specs-table td:first-child {
    font-weight: 600;
    color: var(--color-text-light);
    width: 40%;
    background: var(--color-bg);
}

.detail-tags { margin-top: 20px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.detail-tags strong { font-size: 0.85rem; color: var(--color-text-light); }

.tag {
    display: inline-block;
    padding: 5px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--color-text-light);
    transition: var(--transition-fast);
}

.tag:hover {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

/* Order steps */
.order-steps { display: flex; flex-direction: column; gap: 24px; }

.order-step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.order-step__num {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-secondary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    flex-shrink: 0;
    font-family: var(--font-heading);
}

.order-step__content h4 {
    font-size: 1rem;
    margin-bottom: 6px;
    font-family: var(--font-primary);
}

.order-step__content p {
    font-size: 0.88rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin: 0;
}

/* Reviews tab */
.product-reviews {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    padding: 40px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.review-score-big {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 8px;
}

.review-score-big .score {
    font-size: 4rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1;
}

.review-score-big .out-of {
    font-size: 1.2rem;
    color: var(--color-text-light);
}

.product-reviews__write h4 { margin-bottom: 8px; }
.product-reviews__write p { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 16px; }

/* ========================================
   RELATED PRODUCTS
======================================== */
.related-section { background: var(--color-bg); }

/* ========================================
   STICKY CTA (Mobile)
======================================== */
.product-sticky-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-top: 1px solid var(--color-border);
    padding: 12px 16px;
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    z-index: 900;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
}

.product-sticky-cta .price-sale {
    font-size: 1.4rem;
    font-weight: 700;
}

/* ZOOM MODAL */
.zoom-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.zoom-modal.active {
    opacity: 1;
    visibility: visible;
}

.zoom-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.9);
    backdrop-filter: blur(6px);
}

.zoom-modal__container {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.zoom-modal__close {
    position: absolute;
    top: -44px;
    right: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
}

.zoom-modal__img {
    max-width: 85vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

/* ========================================
   RESPONSIVE
======================================== */
@media (max-width: 1024px) {
    .product-layout { grid-template-columns: 1fr; gap: 32px; }
    .product-gallery { position: static; }
    .detail-content { grid-template-columns: 1fr; }
    .product-reviews { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .product-sticky-cta { display: flex; }
    .product-actions { margin-bottom: 80px; }
    .tabs-nav { gap: 0; }
    .tab-btn { padding: 12px 16px; font-size: 0.85rem; }
}

/* ========================================
   2026 PRODUCT DETAIL UPGRADE
======================================== */
.single-product--upgraded {
    background: linear-gradient(180deg, #fbfaf7 0%, #ffffff 42%, #f8f9fb 100%);
}

.single-product--upgraded .product-layout {
    gap: clamp(34px, 5vw, 72px);
}

.single-product--upgraded .gallery-main {
    border-radius: 8px;
    background: #f5f2ec;
    box-shadow: 0 28px 70px rgba(31,35,44,.14);
    border: 1px solid rgba(201,169,110,.2);
}

.single-product--upgraded .gallery-thumbs {
    padding: 10px 2px 4px;
}

.single-product--upgraded .gallery-thumb {
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(31,35,44,.08);
}

.single-product--upgraded .product-info {
    background: rgba(255,255,255,.86);
    border: 1px solid rgba(26,26,26,.08);
    border-radius: 8px;
    padding: clamp(22px, 3vw, 34px);
    box-shadow: 0 20px 54px rgba(31,35,44,.08);
}

.single-product--upgraded .product-title {
    font-size: clamp(2rem, 4vw, 3.6rem);
    line-height: 1.06;
    letter-spacing: 0;
}

.single-product--upgraded .product-price-block,
.single-product--upgraded .product-guarantees {
    border-radius: 8px;
    background: #fbf7ee;
    border: 1px solid #ead8b7;
}

.single-product--upgraded .product-price-current,
.single-product--upgraded .product-price-sale {
    color: #b58a42;
    font-size: clamp(2rem, 4vw, 3.15rem);
}

.single-product--upgraded .product-short-desc {
    padding: 18px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.single-product--upgraded .product-features {
    display: grid;
    gap: 10px;
}

.single-product--upgraded .product-features li {
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: 8px;
    padding: 10px 12px;
}

.single-product--upgraded .product-tabs-section {
    background: #f7f8fa;
}

.single-product--upgraded .tab-content {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: clamp(22px, 3vw, 36px);
    box-shadow: 0 18px 46px rgba(31,35,44,.06);
}

.single-product--upgraded .tabs-nav {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 6px;
    gap: 6px;
    margin-bottom: 18px;
}

.single-product--upgraded .tab-btn {
    border-radius: 6px;
    border: 0;
    margin: 0;
}

.single-product--upgraded .tab-btn.active {
    background: var(--color-primary);
    color: #fff;
}

@media (max-width: 640px) {
    .single-product--upgraded .product-info {
        padding: 18px;
    }

    .single-product--upgraded .tabs-nav {
        overflow-x: auto;
    }
}

/* ========================================
   PRODUCT REVIEWS PREMIUM TAB
======================================== */
.single-product--upgraded .product-reviews--premium {
    display: grid;
    grid-template-columns: 1.05fr 1.1fr 1fr;
    gap: 18px;
    align-items: stretch;
    margin-bottom: 22px;
}

.review-summary-card,
.review-bars-card,
.review-proof-card,
.product-review-card,
.review-action-strip {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: 0 12px 30px rgba(31,35,44,.06);
}

.product-review-form {
    margin-top: 22px;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 22px;
    padding: 24px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: 0 12px 30px rgba(31,35,44,.06);
}

.product-review-form__intro h3 {
    margin: 10px 0 8px;
    font-size: 1.35rem;
}

.product-review-form__intro p {
    color: var(--color-text-light);
    line-height: 1.65;
}

.mqt-review-form {
    display: grid;
    gap: 14px;
}

.mqt-review-form__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.mqt-review-form label,
.mqt-review-rating-field > span {
    display: block;
    margin-bottom: 7px;
    font-size: .86rem;
    font-weight: 700;
    color: var(--color-primary);
}

.mqt-review-form input[type="text"],
.mqt-review-form input[type="email"],
.mqt-review-form textarea {
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px 13px;
    background: #f9fafb;
    color: var(--color-text);
    outline: none;
}

.mqt-review-form input:focus,
.mqt-review-form textarea:focus {
    border-color: var(--color-secondary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(201,169,110,.14);
}

.mqt-review-stars-input {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.mqt-review-stars-input label {
    margin: 0;
}

.mqt-review-stars-input input {
    position: absolute;
    opacity: 0;
}

.mqt-review-stars-input span {
    display: inline-flex;
    min-height: 36px;
    align-items: center;
    border: 1px solid #ead8b7;
    border-radius: 999px;
    padding: 7px 11px;
    background: #fbf7ee;
    color: #7d612f;
    cursor: pointer;
    font-size: .84rem;
    font-weight: 800;
}

.mqt-review-stars-input input:checked + span {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.mqt-review-form .form-submit {
    margin: 0;
}

.product-review-card--real {
    border-color: rgba(39,174,96,.28);
}

.review-summary-card,
.review-bars-card,
.review-proof-card {
    padding: 24px;
}

.review-summary-card {
    background: linear-gradient(180deg, #fff 0%, #fbf7ee 100%);
    border-color: #ead8b7;
}

.review-summary-card__label {
    display: inline-flex;
    margin-bottom: 12px;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--color-secondary-light);
    color: #9b7232;
    font-size: .72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.review-summary-card p {
    color: var(--color-text-light);
    font-size: .9rem;
    line-height: 1.6;
    margin-top: 12px;
}

.review-bars-card h3,
.review-proof-card h3 {
    font-family: var(--font-primary);
    font-size: 1rem;
    margin: 0 0 16px;
}

.product-rating-bar {
    display: grid;
    grid-template-columns: 48px 1fr 42px;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
    color: var(--color-text-light);
    font-size: .84rem;
}

.product-rating-bar__track {
    height: 8px;
    border-radius: 999px;
    background: #edf0f4;
    overflow: hidden;
}

.product-rating-bar__fill {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #f5b942, var(--color-secondary));
}

.product-rating-bar strong {
    text-align: right;
    color: var(--color-primary);
    font-size: .8rem;
}

.review-proof-card ul {
    display: grid;
    gap: 12px;
}

.review-proof-card li {
    display: flex;
    gap: 10px;
    color: var(--color-text-light);
    font-size: .92rem;
    line-height: 1.55;
}

.review-proof-card i {
    color: var(--color-secondary);
    margin-top: 4px;
}

.product-review-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.product-review-card {
    padding: 20px;
}

.product-review-card__head {
    display: grid;
    grid-template-columns: 44px 1fr auto;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}

.product-review-card__avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--color-primary);
    color: #fff;
    font-weight: 800;
}

.product-review-card__head strong {
    display: block;
    color: var(--color-primary);
}

.product-review-card__head span,
.product-review-card__head time {
    color: var(--color-text-muted);
    font-size: .78rem;
}

.product-review-card__head span i {
    color: #27ae60;
}

.product-review-card__stars {
    margin-bottom: 12px;
}

.product-review-card p {
    color: var(--color-text-light);
    line-height: 1.65;
    font-size: .92rem;
}

.review-action-strip {
    margin-top: 18px;
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    background: #1f2329;
    color: #fff;
}

.review-action-strip strong {
    display: block;
    color: #fff;
    margin-bottom: 4px;
}

.review-action-strip span {
    color: rgba(255,255,255,.74);
    font-size: .9rem;
}

@media (max-width: 980px) {
    .single-product--upgraded .product-reviews--premium,
    .product-review-list {
        grid-template-columns: 1fr;
    }

    .review-action-strip {
        align-items: stretch;
        flex-direction: column;
    }

    .product-review-form,
    .mqt-review-form__grid {
        grid-template-columns: 1fr;
    }
}