/* =========================================================================
   Gas Strainer Store — Product Details Page Styles (Phase 4)
   -------------------------------------------------------------------------
   Covers: image gallery + zoom, product info panel, quantity stepper,
   description/specifications tabs, and the related products section
   (which reuses .product-grid / .product-card from home.css).
   ========================================================================= */

.product-detail {
    padding-block: var(--space-6) var(--space-8);
}

.product-detail__layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-7);
    align-items: start;
}

/* -------------------------------------------------------------------------
   Gallery
   ------------------------------------------------------------------------- */
.gallery__main {
    position: relative;
    aspect-ratio: 1 / 1;
    background-color: var(--color-flame-tint);
    border: 1px solid var(--color-mesh-silver);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: zoom-in;
}

.gallery__main-img {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
    transform-origin: center center;
}

.gallery__main-img svg {
    width: 55%;
    height: 55%;
    color: var(--color-flame);
}

.gallery__main.is-zoomed .gallery__main-img {
    transform: scale(1.9);
    transition: none;
}

.gallery__zoom-hint {
    position: absolute;
    bottom: var(--space-3);
    right: var(--space-3);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    background-color: rgba(31,42,46,0.75);
    color: #fff;
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    pointer-events: none;
}
.gallery__zoom-hint svg { width: 14px; height: 14px; }

.gallery__thumbs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-3);
    margin-top: var(--space-4);
}

.gallery__thumb {
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-flame-tint);
    border: 2px solid var(--color-mesh-silver);
    border-radius: var(--radius-md);
    padding: var(--space-2);
}

.gallery__thumb svg {
    width: 60%;
    height: 60%;
    color: var(--color-flame);
    opacity: 0.85;
}

.gallery__thumb.is-active {
    border-color: var(--color-flame);
}

.gallery__thumb-label {
    display: block;
    font-size: 10px;
    text-align: center;
}

/* -------------------------------------------------------------------------
   Info panel
   ------------------------------------------------------------------------- */
.product-info__category a {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-slate);
}
.product-info__category a:hover { color: var(--color-flame); }

.product-info__title {
    margin-top: var(--space-2);
    margin-bottom: var(--space-3);
}

.product-info__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.product-info__sku {
    font-size: var(--text-xs);
    color: var(--color-slate);
}

.product-info__price-block {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
    padding-block: var(--space-4);
    border-top: 1px solid var(--color-mesh-silver);
    border-bottom: 1px solid var(--color-mesh-silver);
    margin-bottom: var(--space-5);
}

.product-info__price {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-graphite);
}

.product-info__gst-note {
    font-size: var(--text-sm);
    color: var(--color-slate);
}

.product-info__desc {
    margin-bottom: var(--space-5);
}

/* Quantity stepper styles now live in catalog.css (shared with Cart page) */

.product-info__purchase-row {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
    flex-wrap: wrap;
}

.product-info__actions {
    display: flex;
    gap: var(--space-3);
    flex: 1;
    min-width: 220px;
}

.product-info__actions .btn {
    flex: 1;
}

.product-info__actions .btn.is-added {
    background-color: var(--color-success);
    border-color: var(--color-success);
    color: #fff;
}

.product-info__stock-note {
    font-size: var(--text-xs);
    color: var(--color-slate);
    margin-bottom: var(--space-5);
}

/* -------------------------------------------------------------------------
   Description / Specifications tabs
   ------------------------------------------------------------------------- */
.product-tabs {
    margin-top: var(--space-8);
}

.product-tabs__list {
    display: flex;
    gap: var(--space-6);
    border-bottom: 1px solid var(--color-mesh-silver);
    margin-bottom: var(--space-6);
}

.product-tabs__tab {
    background: none;
    border: none;
    padding-block: var(--space-3);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-slate);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
}

.product-tabs__tab.is-active {
    color: var(--color-graphite);
    border-color: var(--color-flame);
}

.product-tabs__panel {
    display: none;
}
.product-tabs__panel.is-active {
    display: block;
}

.product-tabs__panel p {
    max-width: 72ch;
}

.spec-table {
    width: 100%;
    max-width: 640px;
    border-collapse: collapse;
}

.spec-table tr {
    border-bottom: 1px solid var(--color-mesh-silver);
}

.spec-table th,
.spec-table td {
    text-align: left;
    padding: var(--space-3) var(--space-2);
    font-size: var(--text-sm);
}

.spec-table th {
    width: 40%;
    color: var(--color-slate);
    font-weight: 500;
}

.spec-table td {
    color: var(--color-graphite);
    font-weight: 500;
}

/* -------------------------------------------------------------------------
   Related products
   ------------------------------------------------------------------------- */
.related-products {
    margin-top: var(--space-8);
}

/* -------------------------------------------------------------------------
   Responsive
   ------------------------------------------------------------------------- */
@media (max-width: 900px) {
    .product-detail__layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 575px) {
    .gallery__thumbs {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-2);
    }
    .product-info__actions {
        flex-direction: column;
    }
    .product-tabs__list {
        gap: var(--space-4);
    }
}