/* ============================================================
   products.css - LK Foods 产品中心
   左侧分类导航 + 右侧内容切换 + 中英双语切换（与主页一致）
   ============================================================ */
:root {
    --color-primary: #0a3d62;
    --color-primary-light: #1b5d8a;
    --color-dark: #052438;
    --color-accent: #0288d1;
    --color-text: #3d4f5c;
    --color-text-light: #7a8a99;
    --color-bg: #ffffff;
    --color-bg-light: #eef3f8;
    --color-border: #e2e8f0;
    --color-white: #ffffff;
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-cn: 'Noto Sans SC', 'Inter', sans-serif;
    --radius: 12px;
    --shadow-float: 0 4px 14px rgba(10, 61, 98, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-bg-light);
    background-image: url('../images/bg-ocean.jpg');
    background-size: cover;
    background-position: center center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    line-height: 1.7;
}

html[lang="zh"] body { font-family: var(--font-cn); }
html[lang="zh"] h1, html[lang="zh"] h2, html[lang="zh"] h3,
html[lang="zh"] .pf-nav-item, html[lang="zh"] .pf-prod-name {
    font-family: var(--font-cn);
}

/* ======================== LANGUAGE TOGGLE ======================== */
html[lang="en"] .zh-only { display: none !important; }
html[lang="zh"] .en-only { display: none !important; }

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 50px;
    padding: 6px 12px;
    color: #fff;
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease;
    flex-shrink: 0;
}
.lang-toggle:hover { border-color: var(--color-accent); }
.lang-option {
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease;
    padding: 2px 6px;
    border-radius: 50px;
}
.lang-option.active {
    color: var(--color-primary);
    background: var(--color-white);
    font-weight: 600;
}
.lang-sep {
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
    user-select: none;
}

/* ======================== HEADER ======================== */
.pf-header {
    background: var(--color-primary);
    color: #fff;
    padding: 20px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}
.pf-header-main {
    display: flex;
    align-items: center;
    gap: 20px;
    min-width: 0;
}
.pf-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    border-radius: 8px;
    outline: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}
.pf-logo:hover { opacity: 0.88; transform: translateY(-1px); }
.pf-logo:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}
.pf-logo-img {
    height: 46px;
    width: auto;
    max-width: 160px;
    object-fit: contain;
    display: block;
    border-radius: 6px;
    background: #fff;
    padding: 4px 8px;
}
.pf-header-left { min-width: 0; }

@media (max-width: 600px) {
    .pf-header { padding: 16px 18px; }
    .pf-header-main { gap: 14px; }
    .pf-logo-img { height: 38px; max-width: 120px; }
}
.pf-header h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
}
.pf-note {
    margin-top: 6px;
    font-size: 0.9rem;
    opacity: 0.85;
}

/* ---- 左侧导航 + 右侧内容布局 ---- */
.pf-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 60px;
    align-items: start;
}

.pf-nav {
    position: sticky;
    top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow-float);
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.pf-nav-item {
    appearance: none;
    border: none;
    background: var(--color-bg-light);
    color: var(--color-primary);
    text-align: left;
    padding: 14px 16px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    transition: all 0.2s ease;
}
.pf-nav-item::after {
    content: '+';
    font-size: 1.1rem;
    color: var(--color-accent);
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}
.pf-nav-item:hover { background: #eef7fc; }
.pf-nav-item.active {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 12px rgba(10, 61, 98, 0.2);
}
.pf-nav-item.active::after {
    content: '\2212';
    color: #fff;
}

.pf-content {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 32px;
    box-shadow: var(--shadow-float);
    min-height: 500px;
}

.pf-panel { display: none; }
.pf-panel.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.pf-panel h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--color-dark);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 12px;
    margin-bottom: 8px;
}
.pf-num {
    background: var(--color-primary);
    color: #fff;
    font-size: 0.85rem;
    min-width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    flex-shrink: 0;
}
.pf-cat-note {
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: 20px;
}

.pf-sub {
    margin: 18px 0;
    padding-left: 16px;
    border-left: 3px solid #c8d5e0;
}
.pf-sub h3 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    color: var(--color-primary);
    margin-bottom: 10px;
}

/* ---- 图片占位符（后续替换为真实图片） ---- */
.pf-ph {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-align: center;
    color: var(--color-text-light);
    background: repeating-linear-gradient(45deg, #f4f8fc, #f4f8fc 12px, #eaf1f8 12px, #eaf1f8 24px);
    border: 2px dashed var(--color-border);
    border-radius: 10px;
    position: relative;
    overflow: hidden;
}
.pf-ph-icon { color: #a9bccd; flex-shrink: 0; }
.pf-ph-label { font-size: 0.8rem; letter-spacing: 0.01em; }


.pf-prod-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 12px;
}
.pf-prod {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.85rem;
    background: var(--color-bg-light);
    color: var(--color-text);
    padding: 10px;
    border-radius: 10px;
    border: 1px solid transparent;
    transition: border-color 0.18s ease, transform 0.18s ease;
}
.pf-prod:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}
/* 商品图片占位（后续替换为真实商品图） */
.pf-prod-thumb {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 8px;
    overflow: hidden;
    background: #f4f8fc;
}
.pf-prod-thumb .pf-ph-icon { width: 26px; height: 26px; }
.pf-prod-img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    border-radius: 8px;
    background: #fff;
}

/* Filled product images — cover the cell edge-to-edge, no side color bars.
   Used for white-background product shots that should fill the 4:3 thumb. */
.pf-prod-img.pf-fill {
    object-fit: cover;
}
.pf-prod-body {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.pf-prod-name {
    font-weight: 500;
    line-height: 1.25;
}
.pf-prod-sku {
    align-self: flex-start;
    font-size: 0.72rem;
    color: var(--color-text-light);
    background: #fff;
    border: 1px solid var(--color-border);
    padding: 2px 7px;
    border-radius: 50px;
    white-space: nowrap;
}
.pf-empty {
    list-style: none;
    font-size: 0.82rem;
    color: var(--color-text-light);
    font-style: italic;
}

.pf-footer {
    text-align: center;
    padding: 24px;
    color: var(--color-text-light);
    font-size: 0.82rem;
}

/* ---- 移动端：导航横置顶部 ---- */
@media (max-width: 768px) {
    .pf-header { padding: 18px 16px; }
    .pf-header h1 { font-size: 1.25rem; }
    .pf-layout {
        grid-template-columns: 1fr;
        padding: 20px 16px 40px;
    }
    .pf-nav {
        position: static;
        flex-direction: row;
        overflow-x: auto;
        gap: 8px;
        padding: 12px;
        max-height: none;
    }
    .pf-nav-item {
        white-space: nowrap;
        flex-shrink: 0;
        padding: 10px 14px;
    }
    .pf-nav-item::after { display: none; }
    .pf-content { padding: 20px 18px; }
    .pf-prod-list { grid-template-columns: 1fr; }
}

/* ======================== SEARCH ======================== */
.pf-searchbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 22px 24px 0;
}
.pf-search {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 6px 8px 6px 18px;
    box-shadow: var(--shadow-float);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.pf-search:focus-within {
    border-color: var(--color-accent);
    box-shadow: 0 4px 16px rgba(2, 136, 209, 0.18);
}
.pf-search-icon {
    color: var(--color-text-light);
    flex-shrink: 0;
}
.pf-search-input {
    flex: 1;
    min-width: 0;
    border-width: 0;
    outline: none;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text);
}
.pf-search-input::placeholder { color: var(--color-text-light); }
/* hide native clear control (custom button provided) */
.pf-search-input::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; }
html[lang="zh"] .pf-search-input { font-family: var(--font-cn); }
.pf-search-clear {
    appearance: none;
    border: none;
    background: var(--color-bg-light);
    color: var(--color-text-light);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    font-size: 1.15rem;
    line-height: 1;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.2s ease, color 0.2s ease;
}
.pf-search-clear:hover { background: #e2ecf4; color: var(--color-primary); }
.pf-search-clear:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }
.pf-search-status {
    margin: 10px 4px 0;
    font-size: 0.85rem;
    color: var(--color-accent);
    min-height: 1.1em;
}

/* search mode: reveal all non-empty panels, hide empties */
.search-active .pf-panel:not([hidden]) { display: block !important; }
.pf-prod[hidden], .pf-sub[hidden], .pf-panel[hidden] { display: none !important; }

/* matched product emphasis */
.search-active .pf-prod:not([hidden]) {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 1px rgba(2, 136, 209, 0.25);
}

@media (max-width: 600px) {
    .pf-searchbar { padding: 18px 16px 0; }
    .pf-search-input { font-size: 0.9rem; }
}

@media (prefers-reduced-motion: reduce) {
    .pf-panel.active { animation: none; }
    .pf-prod:hover { transform: none; }
    .pf-search { transition: none; }
}