/**
 * استایل‌های صفحه تک محصول
 *
 * @package Titan
 */

/* ===== Main Layout ===== */
.titan-product-single {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px;
}

.titan-product-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
    margin-bottom: 48px;
}

.titan-product-gallery-col {
    position: sticky;
    top: 100px;
}

.titan-product-summary-col {
    padding-top: 8px;
}

.titan-product-summary-inner {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ===== Gallery ===== */
.titan-product-gallery {
    position: relative;
}

.titan-gallery-main {
    position: relative;
    border-radius: var(--titan-radius-lg);
    overflow: hidden;
    background: var(--titan-color-bg-alt);
    cursor: crosshair;
    aspect-ratio: 1;
    width: 100%;
}

.titan-gallery-image-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.titan-gallery-main-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: opacity 0.25s ease, transform 0.25s ease;
    will-change: transform, opacity;
}

.titan-zoom-lens {
    display: none;
    position: absolute;
    width: 120px;
    height: 120px;
    border: 2px solid rgba(255,255,255,0.8);
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.1), 0 4px 20px rgba(0,0,0,0.15);
    background-repeat: no-repeat;
    z-index: 5;
}

.titan-sale-badge-gallery {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 3;
    padding: 6px 14px;
    background: var(--titan-color-error);
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 700;
    border-radius: var(--titan-radius-pill);
    box-shadow: 0 2px 8px rgba(225,112,85,0.3);
}

.titan-gallery-zoom-btn {
    position: absolute;
    bottom: 16px;
    right: 16px;
    z-index: 3;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(8px);
    border: none;
    border-radius: var(--titan-radius-full);
    color: var(--titan-color-text);
    cursor: pointer;
    box-shadow: var(--titan-shadow-sm);
    transition: var(--titan-transition);
}

.titan-gallery-zoom-btn:hover {
    background: var(--titan-color-primary);
    color: #fff;
    transform: scale(1.1);
}

.titan-gallery-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(8px);
    border: none;
    border-radius: var(--titan-radius-full);
    color: var(--titan-color-text);
    cursor: pointer;
    box-shadow: var(--titan-shadow-sm);
    transition: var(--titan-transition);
    opacity: 0;
}

.titan-gallery-main:hover .titan-gallery-nav {
    opacity: 1;
}

.titan-gallery-nav:hover {
    background: var(--titan-color-primary);
    color: #fff;
}

.titan-gallery-prev { left: 12px; }
.titan-gallery-next { right: 12px; }

.titan-gallery-counter {
    position: absolute;
    bottom: 16px;
    left: 16px;
    z-index: 3;
    padding: 4px 12px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    font-size: 0.75rem;
    border-radius: var(--titan-radius-pill);
    backdrop-filter: blur(4px);
}

/* Thumbnails */
.titan-gallery-thumbs {
    display: flex;
    gap: 10px;
    margin-top: 12px;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 4px 0;
}

.titan-gallery-thumbs::-webkit-scrollbar {
    display: none;
}

.titan-thumb-item {
    flex: 0 0 72px;
    height: 72px;
    border-radius: var(--titan-radius-sm);
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--titan-transition);
    opacity: 0.6;
}

.titan-thumb-item:hover {
    opacity: 0.9;
}

.titan-thumb-item.active {
    border-color: var(--titan-color-primary);
    opacity: 1;
    box-shadow: 0 0 0 3px rgba(108,92,231,0.2);
}

.titan-thumb-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ===== Lightbox ===== */
.titan-lightbox {
    position: fixed;
    inset: 0;
    z-index: var(--titan-z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.titan-lightbox.active {
    opacity: 1;
    visibility: visible;
}

.titan-lightbox-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.92);
    backdrop-filter: blur(8px);
}

.titan-lightbox-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 40px;
}

.titan-lightbox-image-wrapper {
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.titan-lightbox-image {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--titan-radius-sm);
    transition: opacity 0.3s ease;
}

.titan-lightbox-close {
    position: absolute;
    top: 20px;
    inset-inline-start: 20px;
    z-index: 2;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--titan-radius-full);
    color: #fff;
    cursor: pointer;
    transition: var(--titan-transition);
}

.titan-lightbox-close:hover {
    background: rgba(255,255,255,0.2);
    transform: rotate(90deg);
}

.titan-lightbox-prev,
.titan-lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--titan-radius-full);
    color: #fff;
    cursor: pointer;
    transition: var(--titan-transition);
}

.titan-lightbox-prev:hover,
.titan-lightbox-next:hover {
    background: rgba(255,255,255,0.25);
}

.titan-lightbox-prev { left: 20px; }
.titan-lightbox-next { right: 20px; }

.titan-lightbox-counter {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    padding: 6px 16px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--titan-radius-pill);
    color: #fff;
    font-size: 0.8125rem;
}

/* ===== Product Summary ===== */
.titan-product-breadcrumb {
    margin-bottom: 16px;
}

.titan-product-breadcrumb .titan-breadcrumb-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 0;
    margin: 0;
}

.titan-product-breadcrumb .titan-breadcrumb-item {
    font-size: 0.8125rem;
    color: var(--titan-color-text-muted);
}

.titan-product-breadcrumb .titan-breadcrumb-item a {
    color: var(--titan-color-text-light);
    text-decoration: none;
    transition: var(--titan-transition);
}

.titan-product-breadcrumb .titan-breadcrumb-item a:hover {
    color: var(--titan-color-primary);
}

.titan-product-breadcrumb .titan-breadcrumb-sep {
    margin: 0 6px;
    color: var(--titan-color-text-muted);
}

.titan-product-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--titan-color-text);
    margin-bottom: 12px;
    line-height: 1.4;
}

.titan-product-rating-summary {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.titan-rating-stars {
    display: flex;
    gap: 2px;
}

.titan-rating-stars .titan-star {
    width: 18px;
    height: 18px;
    color: var(--titan-color-accent);
}

.titan-rating-stars .titan-star--empty {
    color: var(--titan-color-border);
}

.titan-rating-count {
    font-size: 0.8125rem;
    color: var(--titan-color-text-light);
    text-decoration: none;
    transition: var(--titan-transition);
}

.titan-rating-count:hover {
    color: var(--titan-color-primary);
}

.titan-product-sku {
    font-size: 0.8125rem;
    color: var(--titan-color-text-muted);
    margin-bottom: 16px;
}

.titan-sku-label {
    margin-left: 4px;
}

.titan-sku-value {
    font-weight: 500;
    color: var(--titan-color-text-light);
}

/* Price */
.titan-product-price-box {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.titan-product-price-box .price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--titan-color-primary) !important;
}

.titan-product-price-box .price del {
    font-size: 1rem;
    font-weight: 400;
    color: var(--titan-color-text-muted);
}

.titan-product-price-box .price ins {
    text-decoration: none;
    color: var(--titan-color-primary);
}

.titan-discount-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--titan-color-error);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--titan-radius-pill);
    animation: titan-badge-pulse 2s ease infinite;
}

@keyframes titan-badge-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.titan-product-short-desc {
    font-size: 0.9375rem;
    color: var(--titan-color-text-light);
    line-height: 1.8;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--titan-color-border);
}

/* Attributes */
.titan-product-attributes {
    margin-bottom: 20px;
}

.titan-attr-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.titan-attr-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--titan-color-text);
    min-width: 80px;
    flex-shrink: 0;
}

.titan-attr-values {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.titan-color-swatch {
    width: 32px;
    height: 32px;
    border-radius: var(--titan-radius-full);
    border: 2px solid var(--titan-color-border);
    cursor: pointer;
    transition: var(--titan-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
    color: var(--titan-color-text-muted);
}

.titan-color-swatch:hover,
.titan-color-swatch.active {
    border-color: var(--titan-color-primary);
    transform: scale(1.15);
    box-shadow: 0 0 0 3px rgba(108,92,231,0.2);
}

.titan-attr-value-chip {
    padding: 6px 14px;
    border: 2px solid var(--titan-color-border);
    border-radius: var(--titan-radius-sm);
    font-size: 0.8125rem;
    color: var(--titan-color-text);
    cursor: pointer;
    transition: var(--titan-transition);
}

.titan-attr-value-chip:hover,
.titan-attr-value-chip.active {
    border-color: var(--titan-color-primary);
    background: rgba(108,92,231,0.05);
    color: var(--titan-color-primary);
}

/* Stock */
.titan-product-stock-status {
    margin-bottom: 20px;
}

.titan-stock-in,
.titan-stock-backorder,
.titan-stock-out {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 500;
}

.titan-stock-in {
    color: var(--titan-color-success);
}

.titan-stock-backorder {
    color: var(--titan-color-warning);
}

.titan-stock-out {
    color: var(--titan-color-error);
}

/* ===== Buy Box ===== */
.titan-product-buy-box {
    padding: 20px;
    background: var(--titan-color-bg-alt);
    border-radius: var(--titan-radius-md);
    margin-bottom: 20px;
}

.titan-buy-box-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.titan-quantity-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.titan-qty-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--titan-color-text);
}

.titan-qty-box {
    display: flex;
    align-items: center;
    border: 2px solid var(--titan-color-border);
    border-radius: var(--titan-radius-sm);
    overflow: hidden;
    background: var(--titan-color-white);
}

.titan-qty-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--titan-color-text);
    cursor: pointer;
    transition: var(--titan-transition);
    position: relative;
    z-index: 1;
}

.titan-qty-btn:hover {
    background: var(--titan-color-primary);
    color: #fff;
}

.titan-qty-btn:active {
    transform: scale(0.92);
}

.titan-qty-input {
    width: 56px;
    height: 40px;
    border: none;
    border-left: 1px solid var(--titan-color-border);
    border-right: 1px solid var(--titan-color-border);
    text-align: center;
    font-family: var(--titan-font-primary);
    font-size: 1rem;
    font-weight: 600;
    background: transparent;
    color: var(--titan-color-text);
    -moz-appearance: textfield;
}

.titan-qty-input::-webkit-outer-spin-button,
.titan-qty-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.titan-buy-box-actions-side {
    display: flex;
    gap: 8px;
}

.titan-action-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--titan-color-border);
    border-radius: var(--titan-radius-full);
    background: var(--titan-color-white);
    color: var(--titan-color-text-light);
    cursor: pointer;
    transition: var(--titan-transition);
}

.titan-action-btn:hover,
.titan-action-btn.active {
    border-color: var(--titan-color-error);
    color: var(--titan-color-error);
    background: rgba(225,112,85,0.05);
}

.titan-action-btn.active .titan-heart-icon {
    animation: titan-heart-beat 0.4s ease;
}

@keyframes titan-heart-beat {
    0% { transform: scale(1); }
    25% { transform: scale(1.3); }
    50% { transform: scale(0.9); }
    75% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.titan-buy-box-buttons {
    display: flex;
    gap: 10px;
}

.titan-add-to-cart-btn,
.titan-buy-now-btn {
    flex: 1;
}

.titan-add-to-cart-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    background: var(--titan-color-primary);
    color: #fff;
    border: none;
    border-radius: var(--titan-radius-sm);
    font-family: var(--titan-font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--titan-transition);
    text-decoration: none;
}

.titan-add-to-cart-btn:hover {
    background: var(--titan-color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(108,92,231,0.3);
    color: #fff;
}

.titan-add-to-cart-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.titan-add-to-cart-btn.added {
    background: var(--titan-color-success);
}

.titan-buy-now-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    background: transparent;
    color: var(--titan-color-primary);
    border: 2px solid var(--titan-color-primary);
    border-radius: var(--titan-radius-sm);
    font-family: var(--titan-font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--titan-transition);
    text-decoration: none;
}

.titan-buy-now-btn:hover {
    background: var(--titan-color-primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(108,92,231,0.3);
}

.titan-buy-now-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

.titan-btn-disabled {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 24px;
    background: var(--titan-color-text-muted);
    color: #fff;
    border: none;
    border-radius: var(--titan-radius-sm);
    font-family: var(--titan-font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: not-allowed;
    opacity: 0.6;
}

/* Meta info */
.titan-product-meta-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--titan-color-border);
}

.titan-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8125rem;
    color: var(--titan-color-text-light);
}

.titan-meta-item svg {
    flex-shrink: 0;
    color: var(--titan-color-text-muted);
}

/* ===== Tabs (full-width below gallery+info) ===== */
.titan-product-tabs-wrapper {
    width: 100%;
    margin-bottom: 48px;
}

.titan-product-tabs {
    margin-top: 0;
}

.titan-tabs-nav-wrapper {
    position: relative;
    margin-bottom: 32px;
    border-bottom: 2px solid var(--titan-color-border);
}

.titan-tabs-nav {
    display: flex;
    gap: 0;
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-x: auto;
    scrollbar-width: none;
}

.titan-tabs-nav::-webkit-scrollbar {
    display: none;
}

.titan-tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 24px;
    border: none;
    background: transparent;
    font-family: var(--titan-font-primary);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--titan-color-text-light);
    cursor: pointer;
    white-space: nowrap;
    transition: var(--titan-transition);
    position: relative;
}

.titan-tab-btn:hover {
    color: var(--titan-color-text);
}

.titan-tab-btn.active {
    color: var(--titan-color-primary);
    font-weight: 600;
}

.titan-tab-btn svg {
    flex-shrink: 0;
    opacity: 0.5;
}

.titan-tab-btn.active svg {
    opacity: 1;
}

.titan-tab-count {
    padding: 2px 8px;
    background: var(--titan-color-bg-alt);
    border-radius: var(--titan-radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--titan-color-text-muted);
}

.titan-tab-btn.active .titan-tab-count {
    background: rgba(108,92,231,0.1);
    color: var(--titan-color-primary);
}

.titan-tabs-indicator {
    position: absolute;
    bottom: -2px;
    height: 2px;
    background: var(--titan-color-primary);
    border-radius: 2px;
    transition: left 0.3s ease, width 0.3s ease;
}

.titan-tab-panel {
    animation: titan-tab-fade-in 0.3s ease;
}

.titan-tab-panel[hidden] {
    display: none;
}

@keyframes titan-tab-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.titan-tab-panel-inner {
    font-size: 0.9375rem;
    line-height: 1.8;
    color: var(--titan-color-text-light);
}

.titan-tab-panel-inner h2,
.titan-tab-panel-inner h3 {
    color: var(--titan-color-text);
    margin-top: 24px;
    margin-bottom: 12px;
}

.titan-tab-panel-inner table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

.titan-tab-panel-inner table th,
.titan-tab-panel-inner table td {
    padding: 12px 16px;
    text-align: right;
    border-bottom: 1px solid var(--titan-color-border);
    font-size: 0.875rem;
}

.titan-tab-panel-inner table th {
    font-weight: 600;
    color: var(--titan-color-text);
    background: var(--titan-color-bg-alt);
    width: 30%;
}

.titan-tab-panel-inner table td {
    color: var(--titan-color-text-light);
}

/* ===== Reviews ===== */
.titan-product-reviews {
    max-width: 100%;
}

.titan-reviews-summary {
    display: flex;
    gap: 32px;
    padding: 24px;
    background: var(--titan-color-bg-alt);
    border-radius: var(--titan-radius-md);
    margin-bottom: 32px;
}

.titan-reviews-avg {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    text-align: center;
}

.titan-reviews-avg-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--titan-color-text);
    line-height: 1;
    margin-bottom: 8px;
}

.titan-reviews-avg-stars {
    display: flex;
    gap: 2px;
    margin-bottom: 6px;
}

.titan-reviews-avg-stars .titan-star {
    width: 20px;
    height: 20px;
    color: var(--titan-color-accent);
}

.titan-reviews-avg-stars .titan-star--empty {
    color: var(--titan-color-border);
}

.titan-reviews-avg-count {
    font-size: 0.8125rem;
    color: var(--titan-color-text-muted);
}

.titan-reviews-distribution {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
}

.titan-rating-bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.titan-rating-bar-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--titan-color-text);
    min-width: 32px;
    text-align: center;
}

.titan-rating-bar-track {
    flex: 1;
    height: 8px;
    background: var(--titan-color-border);
    border-radius: 4px;
    overflow: hidden;
}

.titan-rating-bar-fill {
    height: 100%;
    background: var(--titan-color-accent);
    border-radius: 4px;
    transition: width 0.6s ease;
}

.titan-rating-bar-count {
    font-size: 0.75rem;
    color: var(--titan-color-text-muted);
    min-width: 24px;
    text-align: center;
}

/* Review items */
.titan-review-items {
    list-style: none;
    padding: 0;
    margin: 0;
}

.titan-reviews-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--titan-color-text-muted);
}

.titan-reviews-empty svg {
    margin-bottom: 12px;
    opacity: 0.4;
}

.titan-reviews-empty p {
    font-size: 0.9375rem;
}

/* Review form */
.titan-review-form-wrapper {
    margin-top: 32px;
    padding: 24px;
    background: var(--titan-color-bg-alt);
    border-radius: var(--titan-radius-md);
}

.titan-review-form-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.titan-form-group {
    margin-bottom: 16px;
}

.titan-form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--titan-color-text);
}

.titan-form-group .required {
    color: var(--titan-color-error);
}

.titan-form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--titan-color-border);
    border-radius: var(--titan-radius-sm);
    font-family: var(--titan-font-primary);
    font-size: 0.9375rem;
    color: var(--titan-color-text);
    background: var(--titan-color-white);
    transition: var(--titan-transition);
}

.titan-form-control:focus {
    outline: none;
    border-color: var(--titan-color-primary);
    box-shadow: 0 0 0 3px rgba(108,92,231,0.1);
}

.titan-textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== Sticky Buy Box ===== */
.titan-sticky-buy-box {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--titan-z-sticky);
    background: var(--titan-color-white);
    border-top: 1px solid var(--titan-color-border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.titan-sticky-buy-box.visible {
    transform: translateY(0);
}

.titan-sticky-buy-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 0;
}

.titan-sticky-buy-product {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.titan-sticky-buy-thumb {
    width: 48px;
    height: 48px;
    border-radius: var(--titan-radius-sm);
    object-fit: cover;
    flex-shrink: 0;
}

.titan-sticky-buy-info {
    min-width: 0;
}

.titan-sticky-buy-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--titan-color-text);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.titan-sticky-buy-price {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--titan-color-primary);
}

.titan-sticky-buy-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.titan-sticky-qty-box {
    display: flex;
    align-items: center;
    border: 2px solid var(--titan-color-border);
    border-radius: var(--titan-radius-sm);
    overflow: hidden;
    background: var(--titan-color-white);
}

.titan-sticky-qty-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--titan-color-text);
    cursor: pointer;
    transition: var(--titan-transition);
}

.titan-sticky-qty-btn:hover {
    background: var(--titan-color-primary);
    color: #fff;
}

.titan-sticky-qty-input {
    width: 40px;
    height: 32px;
    border: none;
    border-left: 1px solid var(--titan-color-border);
    border-right: 1px solid var(--titan-color-border);
    text-align: center;
    font-family: var(--titan-font-primary);
    font-size: 0.875rem;
    font-weight: 600;
    background: transparent;
    color: var(--titan-color-text);
    -moz-appearance: textfield;
}

.titan-sticky-qty-input::-webkit-outer-spin-button,
.titan-sticky-qty-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.titan-sticky-add-to-cart,
.titan-sticky-buy-now {
    padding: 10px 20px;
    font-size: 0.875rem;
    white-space: nowrap;
}

.titan-sticky-add-to-cart:active,
.titan-sticky-buy-now:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

/* ===== Related Posts ===== */
.titan-blog-card-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: var(--titan-color-bg-alt);
    color: var(--titan-color-text-muted);
}

/* ===== Animations ===== */
.titan-fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.titan-fade-in.titan-animated {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Loading State ===== */
.titan-btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.titan-btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: titan-spin 0.6s linear infinite;
    top: 50%;
    left: 50%;
    margin-top: -10px;
    margin-left: -10px;
}

@keyframes titan-spin {
    to { transform: rotate(360deg); }
}

/* ===== Focus Visible (Accessibility) ===== */
.titan-tab-btn:focus-visible,
.titan-qty-btn:focus-visible,
.titan-action-btn:focus-visible,
.titan-gallery-nav:focus-visible,
.titan-gallery-zoom-btn:focus-visible,
.titan-add-to-cart-btn:focus-visible,
.titan-buy-now-btn:focus-visible,
.titan-lightbox-close:focus-visible,
.titan-lightbox-prev:focus-visible,
.titan-lightbox-next:focus-visible,
.titan-sticky-add-to-cart:focus-visible,
.titan-sticky-buy-now:focus-visible,
.titan-sticky-qty-btn:focus-visible {
    outline: 2px solid var(--titan-color-primary);
    outline-offset: 2px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .titan-product-main {
        gap: 28px;
    }

    .titan-product-title {
        font-size: 1.5rem;
    }

    .titan-product-price-box .price {
        font-size: 1.5rem;
    }

    .titan-reviews-summary {
        flex-direction: column;
        gap: 20px;
    }

    .titan-reviews-avg {
        flex-direction: row;
        gap: 16px;
    }
}

@media (max-width: 768px) {
    .titan-product-single {
        padding: 16px 12px;
    }

    .titan-product-main {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .titan-product-gallery-col {
        position: static;
    }

    .titan-product-summary-col {
        order: 2;
    }

    .titan-product-title {
        font-size: 1.25rem;
    }

    .titan-product-price-box .price {
        font-size: 1.25rem;
    }

    .titan-buy-box-buttons {
        flex-direction: column;
    }

    .titan-sticky-buy-inner {
        flex-wrap: wrap;
    }

    .titan-sticky-buy-product {
        flex: 1 1 100%;
    }

    .titan-sticky-buy-actions {
        flex: 1 1 100%;
    }

    .titan-sticky-add-to-cart,
    .titan-sticky-buy-now {
        flex: 1;
    }

    .titan-tab-btn {
        padding: 12px 16px;
        font-size: 0.8125rem;
    }

    .titan-lightbox-content {
        padding: 16px;
    }

    .titan-lightbox-prev,
    .titan-lightbox-next {
        width: 40px;
        height: 40px;
    }

    .titan-lightbox-prev { left: 8px; }
    .titan-lightbox-next { right: 8px; }
}

@media (max-width: 480px) {
    .titan-qty-box {
        border-width: 1px;
    }

    .titan-qty-btn {
        width: 36px;
        height: 36px;
    }

    .titan-qty-input {
        width: 44px;
        height: 36px;
    }
}