/* ============================================================================
   獨立商品頁 /product/{id} 與首頁商品目錄 — 沿用 index.css 的 tokens 與元件
   ============================================================================ */

/* ── Header 返回連結 ───────────────────────────────────────────────────── */
.product-back-link {
    display: inline-flex;
    white-space: nowrap;
    align-items: center;
    padding: 10px 18px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--pine);
    border-radius: var(--r-pill);
    box-shadow: 0 0 0 1px var(--hair-strong);
    transition: background var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
}

.product-back-link:hover {
    background: var(--pine);
    color: var(--paper);
    box-shadow: 0 0 0 1px var(--pine);
}

/* ── 麵包屑 ───────────────────────────────────────────────────────────── */
.breadcrumb ol {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.8125rem;
    color: var(--ink-mute);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; min-width: 0; }
.breadcrumb li + li::before { content: "/"; color: var(--ink-faint); }
.breadcrumb a:hover { color: var(--pine); text-decoration: underline; }

.breadcrumb li[aria-current] {
    color: var(--ink);
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 60ch;
}

/* ── 商品主體 ─────────────────────────────────────────────────────────── */
.product-detail {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    margin-top: 24px;
    padding: 40px;
    background: var(--paper);
    border-radius: var(--r-lg);
    box-shadow: 0 0 0 1px var(--hair), var(--lift-2);
}

.product-detail .detail-media {
    position: sticky;
    top: 110px;
    align-self: start;
}

.product-detail .detail-category { margin: 0 0 14px; }

.product-title {
    font-size: 1.875rem;
    font-weight: 700;
}

.product-stock {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    font-size: 0.8125rem;
    font-weight: 600;
}

.product-stock::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
}

.product-stock.is-in  { color: var(--ok); }
.product-stock.is-out { color: var(--persimmon); }

/* 縮圖列 */
.product-thumbs {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
    gap: 10px;
}

.product-thumb {
    display: block;
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: var(--r);
    background: var(--bone-deep);
    box-shadow: 0 0 0 1px var(--hair);
    opacity: 0.7;
    transition: opacity var(--t-fast), box-shadow var(--t-fast);
}

.product-thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-thumb:hover { opacity: 1; }

.product-thumb.is-active {
    opacity: 1;
    box-shadow: 0 0 0 2px var(--pine);
}

/* 訂購區 */
.product-order {
    width: 100%;
    margin-top: 30px;
    padding-top: 26px;
    border-top: 1px solid var(--hair);
}

.product-order-title {
    scroll-margin-top: 110px;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-order .order-message { color: var(--ok); }
.product-order .order-message.error { color: var(--danger); }
.product-order .line-button { margin-top: 12px; }

/* ── 相關商品 ─────────────────────────────────────────────────────────── */
.product-related { margin-top: 64px; }

.product-related-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 22px;
}

.product-related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 22px;
}

.product-related-grid .product-card { height: 100%; }

/* ── 404 ──────────────────────────────────────────────────────────────── */
.product-missing {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 96px;
    padding-bottom: 96px;
}

.product-missing .order-submit-btn { width: auto; margin-top: 10px; }

/* ── 商品目錄頁 /catalog：市集價目表 ─────────────────────────────────── */
.catalog-page .catalog-index-head { margin-top: 22px; }

.catalog-index-title { scroll-margin-top: 120px; }

/* 分類跳轉列 */
.catalog-jump {
    position: sticky;
    top: 82px;
    z-index: 5;
    margin: 0 calc(var(--gutter) * -1) 26px;
    padding: 12px var(--gutter);
    background: rgba(245, 242, 235, 0.92);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
}

.catalog-jump .side-menu-chip { white-space: nowrap; }

.catalog-index-group { scroll-margin-top: 170px; }

.catalog-index-group:target {
    box-shadow: 0 0 0 2px var(--pine), var(--lift-2);
}

.catalog-empty {
    padding: 60px 0;
    text-align: center;
    color: var(--ink-mute);
}

.catalog-index-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px 32px;
    flex-wrap: wrap;
    margin-bottom: 18px;
    padding-bottom: 18px;
    border-bottom: 1.5px solid var(--ink);
}

.catalog-index-title {
    margin-top: 6px;
    font-size: 2rem;
    font-weight: 700;
    scroll-margin-top: 120px;
}

.catalog-index-sub {
    font-size: 0.8125rem;
    color: var(--ink-mute);
}

.catalog-index-groups {
    columns: 3 300px;
    column-gap: 22px;
}

.catalog-index-group {
    break-inside: avoid;
    margin-bottom: 22px;
    padding: 20px 22px 14px;
    background: var(--paper);
    border-radius: var(--r-lg);
    box-shadow: 0 0 0 1px var(--hair-soft), var(--lift-1);
}

.catalog-index-cat {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 12px;
    margin-bottom: 4px;
    font-family: "Noto Serif TC", var(--font-display);
    font-size: 1.0625rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--pine);
    border-bottom: 1px solid var(--hair);
}

.catalog-index-cat span {
    padding: 2px 9px;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--pine-mid);
    background: var(--pine-tint);
    border-radius: var(--r-pill);
}

.catalog-index-group li + li { border-top: 1px dashed var(--hair-soft); }

.catalog-index-group a {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin: 0 -10px;
    padding: 10px 10px;
    border-radius: var(--r);
    transition: background var(--t-fast);
}

.catalog-index-name {
    min-width: 0;
    font-size: 0.875rem;
    line-height: 1.55;
    color: var(--ink);
    transition: color var(--t-fast);
}

.catalog-index-leader {
    flex: 1;
    min-width: 18px;
    border-bottom: 1.5px dotted var(--hair-strong);
    transform: translateY(-4px);
}

.catalog-index-price {
    flex-shrink: 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--persimmon);
}

.catalog-index-price em {
    margin-right: 6px;
    padding: 1px 6px;
    font-family: var(--font-body);
    font-style: normal;
    font-size: 0.625rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    vertical-align: 1px;
    color: var(--ink-mute);
    background: var(--bone-deep);
    border-radius: var(--r-xs);
}

.catalog-index-group li.is-out .catalog-index-name { color: var(--ink-mute); }
.catalog-index-group li.is-out .catalog-index-price { color: var(--ink-faint); }

.catalog-index-group a:hover { background: var(--pine-wash); }
.catalog-index-group a:hover .catalog-index-name { color: var(--pine); }

/* ── RWD ──────────────────────────────────────────────────────────────── */
@media (max-width: 920px) {
    .catalog-jump { top: 72px; }
    .product-detail {
        grid-template-columns: minmax(0, 1fr);
        gap: 28px;
        padding: 28px;
    }

    .product-detail .detail-media { position: static; }
}

@media (max-width: 720px) {
    /* 手機版 logo 即可回首頁，只留一顆按鈕 */
    .product-back-link.is-home:not(:only-of-type) { display: none; }
    .product-back-link { padding: 9px 14px; }
    .product-page { padding-top: 18px; }

    .product-detail {
        margin-top: 16px;
        padding: 18px;
    }

    .product-title { font-size: 1.375rem; }
    .breadcrumb li[aria-current] { max-width: 24ch; }

    .product-related { margin-top: 44px; }
    .product-related-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px 12px;
    }

    .catalog-jump { top: 72px; }
    .catalog-jump .side-menu-chips {
        flex-wrap: nowrap;
        overflow-x: auto;
        scrollbar-width: none;
        margin: 0 calc(var(--gutter) * -1);
        padding: 2px var(--gutter);
    }
    .catalog-jump .side-menu-chips::-webkit-scrollbar { display: none; }
    .catalog-index-group { scroll-margin-top: 150px; }
    .catalog-index-title { font-size: 1.5rem; }
    .catalog-index-group { padding: 16px 16px 8px; }
}