/* ================================================================
   KORLSHOW Site56 — Production CSS v3 (Mobile-First Responsive)
   Font: Alibaba PuHuiTi + AlibabaSans (local WOFF2)
   Zero CDN · Semantic classes · CSS Custom Properties · GPU Compositing
   Responsive: 480px / 768px / 1024px / 1440px
   ================================================================ */

/* ==================== @font-face ==================== */
@font-face {
    font-family: 'AlibabaPuHuiTi';
    src: url('../fonts/Alibaba-PuHuiTi-Regular.woff2') format('woff2');
    font-weight: 400; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF, U+F900-FAFF, U+200B-200D, U+2014, U+2018-201F, U+2026, U+2030,
        U+2E80-2EFF, U+3000-303F, U+FF01-FF5E;
}
@font-face {
    font-family: 'AlibabaPuHuiTi';
    src: url('../fonts/Alibaba-PuHuiTi-Medium.woff2') format('woff2');
    font-weight: 500; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF, U+F900-FAFF, U+200B-200D, U+2014, U+2018-201F, U+2026, U+2030,
        U+2E80-2EFF, U+3000-303F, U+FF01-FF5E;
}
@font-face {
    font-family: 'AlibabaPuHuiTi';
    src: url('../fonts/Alibaba-PuHuiTi-Bold.woff2') format('woff2');
    font-weight: 700; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF, U+F900-FAFF, U+200B-200D, U+2014, U+2018-201F, U+2026, U+2030,
        U+2E80-2EFF, U+3000-303F, U+FF01-FF5E;
}
@font-face {
    font-family: 'AlibabaSans';
    src: url('../fonts/AlibabaSans-Regular.woff2') format('woff2');
    font-weight: 400; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF;
}
@font-face {
    font-family: 'AlibabaSans';
    src: url('../fonts/AlibabaSans-Medium.woff2') format('woff2');
    font-weight: 500; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF;
}
@font-face {
    font-family: 'AlibabaSans';
    src: url('../fonts/AlibabaSans-Bold.woff2') format('woff2');
    font-weight: 700; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF;
}
@font-face {
    font-family: 'AlibabaSans';
    src: url('../fonts/AlibabaSans-Heavy.woff2') format('woff2');
    font-weight: 800; font-style: normal;
    font-display: swap;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
        U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD,
        U+4E00-9FFF, U+3400-4DBF;
}

/* ==================== Design Tokens ==================== */
:root {
    --color-primary: #22c55e;
    --color-primary-dark: #16a34a;
    --color-primary-light: #4ade80;
    --color-primary-bg: rgba(34,197,94,0.08);
    --color-dark: #111827;
    --color-text: #374151;
    --color-text-muted: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-surface: #f8fafc;
    --color-border: #e5e7eb;
    --color-border-light: #f0f0f0;
    --color-border-dark: #d1d5db;
    --font-base: 'AlibabaPuHuiTi', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'AlibabaPuHuiTi', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-num: 'AlibabaSans', 'Helvetica Neue', Arial, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    /* 响应式基准 */
    --nav-height: 64px;
    --container-px: 20px;
    --section-py: 48px;
}

/* ==================== Reset & Base ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    font-size: 16px;
}
body {
    font-family: var(--font-base);
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: #fff;
    background-image: none;
    overflow-x: hidden;
    /* 安全区域底部 */
    padding-bottom: env(safe-area-inset-bottom, 0);
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    image-rendering: auto;
}
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
address { font-style: normal; }

/* ==================== Utility ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding-left: var(--container-px);
    padding-right: var(--container-px);
}
.section-header { text-align: center; margin-bottom: 40px; }
.section-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 10px;
}
.section-heading {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 800;
    color: var(--color-dark);
    margin-bottom: 14px;
    letter-spacing: -0.02em;
}
.section-desc {
    font-size: 15px;
    color: var(--color-text-muted);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.75;
}
.section-action { text-align: center; margin-top: 36px; }

/* ==================== Skip Link ==================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: #fff;
    padding: 12px 24px;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    z-index: 10000;
    font-weight: 600;
    transition: top 0.25s ease-out;
}
.skip-link:focus { top: 0; outline: none; }
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}
:focus:not(:focus-visible) { outline: none; }

/* ==================== Navigation ==================== */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: #ffffff;
    background-image: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    transition: background-color 0.3s ease-out, box-shadow 0.3s ease-out;
    padding-top: env(safe-area-inset-top, 0);
}
.site-nav.scrolled { background-color: #ffffff; box-shadow: var(--shadow-md); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 var(--container-px); background-color: transparent; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); background-color: transparent; }
.nav-logo { display: flex; align-items: center; flex-shrink: 0; }
.logo-text {
    height: 40px;
    width: auto;
}
.nav-menu { display: none; } /* 移动端隐藏桌面菜单 */
.nav-link {
    display: inline-block;
    padding: 8px 14px;
    font-size: 15px;
    font-weight: 500;
    color: rgba(0,0,0,0.7);
    border-radius: var(--radius-sm);
    transition: color 0.25s ease-out, background-color 0.25s ease-out;
    min-height: 44px; /* 触控目标 */
    display: inline-flex;
    align-items: center;
}
.nav-link:hover { color: var(--color-dark); background: rgba(0,0,0,0.05); }
.nav-link.active { color: var(--color-dark); background: transparent; }

.nav-item-has-children { position: relative; }
.nav-item-has-children > a { padding-right: 28px; }
.nav-item-has-children > a::after {
    content: '';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid rgba(0,0,0,0.7);
    transition: transform 0.25s ease-out;
}
.nav-item-has-children:hover > a::after { transform: translateY(-50%) rotate(180deg); }

.nav-submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    padding: 8px 0;
    margin-top: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s ease-out, visibility 0.25s ease-out, transform 0.25s ease-out;
    z-index: 1000;
}
.nav-item-has-children:hover > .nav-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.nav-submenu li { list-style: none; }
.nav-submenu a {
    display: block;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--color-dark);
    text-decoration: none;
    transition: background-color 0.2s ease-out;
}
.nav-submenu a:hover { background: rgba(34,197,94,0.08); }

/* 移动端汉堡按钮 */
.mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-dark);
    cursor: pointer;
    width: 44px;
    height: 44px;
    padding: 10px;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease, color 0.3s ease-out;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}
.mobile-toggle:hover { background: rgba(0,0,0,0.05); }

/* 全屏沉浸式Drawer */
.mobile-drawer {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    pointer-events: none;
    opacity: 0;
}
.mobile-drawer.open {
    opacity: 1;
    pointer-events: auto;
}
/* 遮罩层 */
.mobile-drawer::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    opacity: 0;
    transition: opacity 0.35s ease-out;
}
.mobile-drawer.open::before {
    opacity: 1;
}
/* 菜单面板 */
.mobile-drawer .mobile-drawer-panel {
    position: absolute;
    top: 0;
    right: 0;
    width: min(320px, 85vw);
    height: 100%;
    background: #f0fdf4;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: -12px 0 40px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
}
.mobile-drawer.open .mobile-drawer-panel {
    transform: translateX(0);
    pointer-events: auto;
}
.drawer-close {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 50%;
    color: rgba(0,0,0,0.6);
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    z-index: 1;
}
.drawer-close:hover { background: rgba(0,0,0,0.05); color: #111; }
/* Drawer导航列表 */
.mobile-nav-list {
    flex: 1;
    min-height: 400px;
    overflow-y: auto;
    padding: 12px 0;
    -webkit-overflow-scrolling: touch;
    background: #f0fdf4;
}
.mobile-nav-list li { border-bottom: none; }
.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    font-size: 16px;
    font-weight: 500;
    color: rgba(0,0,0,0.7);
    transition: all 0.2s ease;
    min-height: 52px;
    position: relative;
    -webkit-tap-highlight-color: transparent;
}
.mobile-nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 60%;
    background: var(--color-primary);
    border-radius: 0 2px 2px 0;
    transition: transform 0.25s ease-out;
}
.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: #111;
    background: rgba(34,197,94,0.08);
}
.mobile-nav-link.active::before,
.mobile-nav-link:hover::before {
    transform: translateY(-50%) scaleY(1);
}
/* 当前页指示器 */
.mobile-nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

/* Drawer底部装饰 */
.drawer-footer {
    padding: 20px 28px;
    border-top: 1px solid rgba(0,0,0,0.08);
    background: rgba(0,0,0,0.02);
}
.drawer-footer-text {
    font-size: 12px;
    color: rgba(0,0,0,0.4);
    text-align: center;
    line-height: 1.6;
}

/* Body滚动锁定（JS控制） */
body.menu-open { overflow: hidden; position: fixed; width: 100%; }

/* ==================== Hero (移动端优化布局) ==================== */
.hero-section {
    position: relative;
    min-height: 600px;
    height: 90vh;
    max-height: 720px;
    display: flex;
    align-items: center;
    overflow: hidden;
    contain: layout style paint;
}
.hero-bg { position: absolute; inset: 0; z-index: 1; overflow: hidden; }
.hero-bg img {
    width: 100%; height: 120%;
    object-fit: cover;
    object-position: center top;
    will-change: transform;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    background: linear-gradient(135deg, rgba(0,0,0,0.72) 0%, rgba(0,0,0,0.45) 55%, rgba(0,0,0,0.58) 100%);
}
.hero-container {
    position: relative;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
    padding-top: 100px;
    padding-bottom: 56px;
    text-align: center;
}

.hero-left { 
    width: 100%; 
    max-width: 100%; 
    color: #fff; 
    opacity: 0;
    animation: heroLeftIn 0.8s ease-out forwards;
    animation-delay: 0.1s;
}
.hero-title {
    font-family: var(--font-heading);
    font-size: 30px;
    font-weight: 800;
    line-height: 1.22;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
    text-shadow: 0 2px 20px rgba(0,0,0,0.35);
    opacity: 0;
    transform: translateY(-20px);
    animation: heroTitleIn 0.6s ease-out forwards;
    animation-delay: 0.2s;
}
.hero-desc {
    font-size: 15px;
    line-height: 1.85;
    margin-bottom: 28px;
    opacity: 0;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
    transform: translateY(20px);
    animation: heroDescIn 0.6s ease-out forwards;
    animation-delay: 0.4s;
}
.hero-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
    opacity: 0;
    transform: scale(0.95);
    animation: heroActionsIn 0.5s ease-out forwards;
    animation-delay: 0.6s;
}
@keyframes heroLeftIn {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes heroTitleIn {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes heroDescIn {
    from { opacity: 0; transform: translateY(25px); }
    to { opacity: 0.88; transform: translateY(0); }
}
@keyframes heroActionsIn {
    from { opacity: 0; transform: scale(0.92); }
    to { opacity: 1; transform: scale(1); }
}
.hero-actions .btn { width: 100%; max-width: 280px; justify-content: center; }

/* Hero 右侧统计卡片 — 移动端横向排列 */
.hero-right {
    display: flex;
    flex-direction: row;
    width: 100%;
    justify-content: center;
    gap: 12px;
    padding: 0 4px;
}
.hero-stat-card {
    background: rgba(255,255,255,0.96);
    border-radius: var(--radius-md);
    padding: 20px 16px;
    text-align: center;
    box-shadow: 0 8px 28px rgba(0,0,0,0.18);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 0.35s ease-out, box-shadow 0.35s ease-out;
    flex: 1;
    max-width: 160px;
    min-width: 0;
}
.hero-stat-card--alt { background: rgba(255,255,255,0.90); }
.hero-stat-card:hover { transform: translateY(-3px); box-shadow: 0 12px 38px rgba(0,0,0,0.22); will-change: transform; }
.hero-stat-value {
    font-family: var(--font-num);
    font-size: 32px;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 6px;
    font-variant-numeric: tabular-nums;
}
.hero-stat-label { font-size: 11.5px; color: var(--color-text-muted); font-weight: 500; line-height: 1.35; }

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 13px 28px;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font-base);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.3s ease-out, background-color 0.3s ease-out, border-color 0.3s ease-out, box-shadow 0.3s ease-out;
    text-align: center;
    gap: 8px;
    min-height: 48px; /* 触控友好 */
    -webkit-tap-highlight-color: transparent;
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(34,197,94,0.35);
}
.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.85);
    transform: translateY(-2px);
}
.btn-sm { padding: 10px 22px; font-size: 14px; min-height: 40px; }

/* ==================== Features / 公司优势 ==================== */
.features-section {
    padding: var(--section-py) 0;
    background: var(--color-surface);
    content-visibility: auto;
    contain-intrinsic-size: 700px;
}
.features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.feature-item {
    text-align: center;
    padding: 28px 16px;
    border-radius: var(--radius-md);
    background: #fff;
    transition: transform 0.35s ease-out, box-shadow 0.35s ease-out;
}
.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    will-change: transform;
}
.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    margin-bottom: 14px;
    transition: background-color 0.3s ease-out, transform 0.3s ease-out;
}
.feature-item:hover .feature-icon { background: var(--color-primary); color: #fff; transform: scale(1.06); }
.feature-item h4 { font-size: 15px; font-weight: 700; color: var(--color-dark); margin-bottom: 6px; }
.feature-item p { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; }

/* ==================== Showroom / 展厅展示 ==================== */
.showroom-section {
    padding: var(--section-py) 0;
    content-visibility: auto;
    contain-intrinsic-size: 800px;
}
.story-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: flex-start; width: 100%; }
.story-text { padding-right: 20px; }
.story-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}
.story-heading {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 24px;
    line-height: 1.3;
}
.story-text p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: 16px;
    text-align: justify;
}
.story-stats { }
.stats-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--color-dark);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 32px;
}
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.stat-item { }
.stat-number {
    font-size: 42px;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.1;
    margin-bottom: 12px;
}
.stat-item p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text);
}

/* ==================== Timeline / 发展历程 ==================== */
.timeline-section {
    padding: 80px 0;
    position: relative;
    overflow: hidden;
    content-visibility: auto;
    contain-intrinsic-size: 800px;
    background: linear-gradient(180deg, rgba(0,180,42,0.02) 0%, rgba(0,180,42,0.06) 50%, rgba(0,180,42,0.02) 100%);
}
.timeline-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0,180,42,0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0,180,42,0.06) 0%, transparent 50%);
    z-index: 0;
}
.timeline-scroll {
    position: relative;
    z-index: 1;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) transparent;
    padding: 0;
}
.timeline-scroll::-webkit-scrollbar { height: 6px; }
.timeline-scroll::-webkit-scrollbar-track { background: rgba(0,180,42,0.06); border-radius: 3px; }
.timeline-scroll::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 3px; }
.timeline-grid {
    display: flex;
    gap: 0;
    position: relative;
    min-width: max-content;
    padding: 0 60px;
}
.timeline-grid::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(0,180,42,0.3) 5%, 
        var(--color-primary) 10%, 
        var(--color-primary) 90%, 
        rgba(0,180,42,0.3) 95%, 
        transparent 100%);
    transform: translateY(-50%);
    z-index: 0;
}
.timeline-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 390px;
    flex-shrink: 0;
    padding: 0;
    margin-left: 60px;
    height: 400px;
}
.timeline-item:first-child {
    margin-left: 0;
}
.timeline-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translate(-50%, -50%);
    z-index: 3;
    box-shadow: 
        0 0 0 8px rgba(0,180,42,0.15),
        0 0 0 18px rgba(0,180,42,0.08),
        0 0 25px 6px rgba(0,180,42,0.35),
        0 0 40px 12px rgba(0,180,42,0.15);
}
.timeline-dot::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #fff;
    z-index: 1;
}
/* 内容卡片 - 与圆点之间有间距 */
.timeline-content {
    width: calc(100% - 18px);
    margin-left: 18px;
    text-align: left;
    position: absolute;
    z-index: 2;
}
/* 长竖线 - 从圆点延伸贯穿内容卡片高度 */
.timeline-content::before {
    content: '';
    position: absolute;
    left: -18px;
    width: 2px;
    height: 100%;
    background: var(--color-primary);
    z-index: 1;
}
.timeline-year {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    display: block;
}
.timeline-content p {
    font-size: 13px;
    line-height: 1.6;
    color: #555;
    margin: 0;
}
.timeline-content--img {
    display: flex;
    flex-direction: row;
    gap: 15px;
    align-items: center;
    text-align: left;
}
.timeline-img-wrap {
    width: 45%;
    max-width: 180px;
    height: 140px;
    overflow: hidden;
    border-radius: 6px;
    flex-shrink: 0;
}
.timeline-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}
.timeline-text-wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
}
/* 奇数项 - 1、3、5、7 - 内容在时间线下方 */
.timeline-item:nth-child(odd) .timeline-content {
    top: calc(50% + 14px);
    left: 0;
}
.timeline-item:nth-child(odd) .timeline-content::before {
    top: -20px;
}
/* 偶数项 - 2、4、6 - 内容在时间线上方 */
.timeline-item:nth-child(even) .timeline-content {
    bottom: calc(50% + 14px);
    left: 0;
}
.timeline-item:nth-child(even) .timeline-content::before {
    top: auto;
    bottom: -20px;
}
.timeline-tip {
    text-align: center;
    color: var(--color-primary);
    font-size: 13px;
    margin-top: 16px;
    font-weight: 500;
    animation: tip-fade 2s ease-in-out infinite;
    position: relative;
    z-index: 1;
}
@keyframes tip-fade {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* ==================== Company Intro / 公司简介 ==================== */
.company-intro-section {
    padding: var(--section-py) 0;
    background: var(--color-surface);
    content-visibility: auto;
    contain-intrinsic-size: 720px;
}
.company-intro-header { text-align: center; margin-bottom: 36px; }
.company-intro-header .section-label { margin-bottom: 8px; }
.company-intro-header .section-heading { margin-bottom: 0; }
.company-intro-grid { display: grid; grid-template-columns: 1fr; gap: 32px; align-items: start; }
.company-intro-text h3 { font-family: var(--font-heading); font-size: 20px; font-weight: 700; color: var(--color-dark); margin-bottom: 16px; }
.company-intro-text p { font-size: 14.5px; line-height: 1.9; color: var(--color-text-muted); margin-bottom: 14px; }
.company-intro-text .btn { margin-top: 8px; }
.company-intro-media {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.4s ease-out, box-shadow 0.4s ease-out;
}
.company-intro-media:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.12); will-change: transform; }
.company-intro-media img { width: 100%; height: auto; max-height: 450px; object-fit: cover; border-radius: var(--radius-lg); }
.company-intro-media video { width: 100%; height: auto; max-height: 450px; border-radius: var(--radius-lg); }

/* ==================== Products / 产品展示 ==================== */
.products-section {
    padding: var(--section-py) 0;
    content-visibility: auto;
    contain-intrinsic-size: 650px;
}
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.product-card {
    display: flex;
    flex-direction: column;
    background: #fff;
    border-radius: var(--radius-md);
    padding: 0 0 26px 0;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: none;
    outline: none;
    transition: transform 0.35s ease-out, box-shadow 0.35s ease-out, background-color 0.35s ease-out;
    aspect-ratio: 4 / 3;
}
.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(34,197,94,0.12);
    background: linear-gradient(135deg, #fafffa 0%, #fff 100%);
    will-change: transform;
}
.product-img-wrap { margin: 0; display: flex; flex: 1.2; }
.product-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    margin-left: 0;
    margin-right: 0;
    transition: transform 0.35s ease-out;
}
.product-card:hover .product-img-wrap img { transform: scale(1.1) rotate(2deg); }
.product-card h4 { font-size: 14.5px; font-weight: 700; color: var(--color-dark); margin-bottom: 4px; }
.product-card p { font-size: 12.5px; color: var(--color-text-muted); }

/* ==================== Factory / 工厂车间 ==================== */
.factory-section {
    padding: var(--section-py) 0;
    background: var(--color-surface);
    content-visibility: auto;
    contain-intrinsic-size: 650px;
}
.factory-grid { display: flex; flex-direction: column; gap: 12px; overflow: hidden; }
.factory-row { overflow: hidden; width: 100%; }
.factory-track { display: flex; gap: 12px; animation: scroll-left 30s linear infinite; }
.factory-row--right .factory-track { animation: scroll-right 30s linear infinite; }
.factory-card {
    flex: 0 0 calc(25% - 9px);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.35s ease-out, box-shadow 0.35s ease-out;
}
.factory-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); will-change: transform; }
.factory-card img {
    width: 100%;
    height: 170px;
    object-fit: cover;
    transition: transform 0.45s ease-out;
}
.factory-card:hover img { transform: scale(1.04); }

@keyframes scroll-left {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

@keyframes scroll-right {
    0% { transform: translateX(-50%); }
    100% { transform: translateX(0); }
}

/* ==================== Quality Control / 品质检测 ==================== */
.quality-section {
    padding: var(--section-py) 0;
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfeff 100%);
    content-visibility: auto;
    contain-intrinsic-size: 700px;
}
.quality-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: 300px repeat(2, 180px);
    grid-template-areas:
        "img1 img1 img1 img1"
        "img2 img3 img4 img5"
        "brand img6 img6 img6";
    gap: 8px;
}
.quality-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.35s ease-out, box-shadow 0.35s ease-out;
}
.quality-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); will-change: transform; }
.quality-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.45s ease-out;
}
.quality-card:hover img { transform: scale(1.04); }
.quality-card:nth-child(1) { grid-area: img1; }
.quality-card:nth-child(2) { grid-area: img2; }
.quality-card:nth-child(3) { grid-area: img3; }
.quality-card:nth-child(4) { grid-area: img4; }
.quality-card:nth-child(5) { grid-area: img5; }
.quality-card:nth-child(6) { grid-area: img6; }
.quality-card:nth-child(7) { grid-area: brand; }
.quality-card--brand {
    background: #22c55e;
    display: flex;
    align-items: center;
    justify-content: center;
}
.quality-card--brand .brand-content {
    display: flex;
    align-items: center;
    justify-content: center;
}
.quality-card--brand svg { width: 60%; height: auto; }

/* ==================== Certifications / 资质证书 ==================== */
.cert-section {
    padding: var(--section-py) 0;
    content-visibility: auto;
    contain-intrinsic-size: 550px;
}
.cert-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.cert-card {
    text-align: center;
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: #fff;
    transition: transform 0.35s ease-out, border-color 0.35s ease-out, box-shadow 0.35s ease-out;
}
.cert-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    will-change: transform;
}
.cert-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    margin-bottom: 16px;
    transition: background-color 0.3s ease-out, transform 0.3s ease-out;
}
.cert-card:hover .cert-icon { background: var(--color-primary); color: #fff; transform: scale(1.06); }
.cert-card h4 { font-size: 16px; font-weight: 700; color: var(--color-dark); margin-bottom: 8px; }
.cert-card p { font-size: 13.5px; line-height: 1.7; color: var(--color-text-muted); }

/* ==================== Team / 团队风采 ==================== */
.team-section {
    padding: var(--section-py) 0;
    background: var(--color-surface);
    content-visibility: auto;
    contain-intrinsic-size: 700px;
}
.team-grid { display: flex; gap: 12px; }
.team-card--lg { flex: 1; }
.team-card-group { display: grid; grid-template-columns: repeat(2, 1fr); grid-template-rows: repeat(2, 1fr); gap: 6px; flex: 1; }
.team-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.35s ease-out, box-shadow 0.35s ease-out;
}
.team-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); will-change: transform; }
.team-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease-out;
}
.team-card--lg img { width: 100%; height: 100%; min-height: 100%; object-fit: cover; }
.team-card:hover img { transform: scale(1.03); }

/* ==================== Footer — 移动端优先设计 ==================== */
.site-footer {
    background: var(--color-dark);
    color: rgba(255,255,255,0.8);
    padding: 44px 0 0;
}

/* 移动端Footer：可折叠手风琴式布局 */
.footer-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 0;
    border-top: 1px solid rgba(255,255,255,0.07);
}

.footer-col {
    border-bottom: 1px solid rgba(255,255,255,0.07);
}
/* 折叠触发器 */
.footer-col-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 16px 0;
    background: none;
    border: none;
    color: #fff;
    font-family: var(--font-base);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    min-height: 48px;
    -webkit-tap-highlight-color: transparent;
    transition: opacity 0.2s ease;
}
.footer-col-toggle:hover { opacity: 0.85; }
.footer-col-toggle svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    transition: transform 0.3s ease-out;
    color: rgba(255,255,255,0.5);
}
.footer-col--open .footer-col-toggle svg { transform: rotate(180deg); }

/* 可折叠内容区 */
.footer-col-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease-out, padding 0.35s ease-out;
    padding-bottom: 0;
}
.footer-col--open .footer-col-content {
    max-height: 400px;
    padding-bottom: 16px;
}

/* Logo列特殊处理：始终展开，带品牌信息 */
.footer-col-brand {
    border-bottom: 1px solid rgba(255,255,255,0.07);
    padding: 24px 0 20px;
}
.footer-logo {
    font-family: var(--font-heading);
    display: inline-block;
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 10px;
}
.footer-desc { font-size: 13.5px; line-height: 1.75; opacity: 0.6; margin-bottom: 0; }

/* Footer链接列表 */
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 0; }
.footer-links a {
    display: block;
    font-size: 14px;
    opacity: 0.55;
    padding: 8px 0;
    transition: opacity 0.2s ease, color 0.2s ease, padding-left 0.2s ease;
    min-height: 40px; /* 触控 */
    display: flex;
    align-items: center;
}
.footer-links a:hover {
    color: var(--color-primary);
    opacity: 1;
    padding-left: 6px;
}

/* Footer联系信息 */
.footer-contact { font-style: normal; }
.footer-contact .contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
}
.footer-contact .contact-item:last-child { padding-bottom: 0; }
.footer-contact svg { flex-shrink: 0; opacity: 0.45; width: 16px; height: 16px; }
.footer-contact span { font-size: 13.5px; opacity: 0.55; }
.footer-contact a { color: inherit; transition: color 0.2s ease; }
.footer-contact a:hover { color: var(--color-primary); opacity: 1; }

/* Footer底部栏 */
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.07);
    padding: 20px 0;
    margin-top: 0;
    text-align: center;
    font-size: 12.5px;
    opacity: 0.35;
    line-height: 1.7;
    /* 安全区底部 */
    padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
}

/* ==================== Back to Top ==================== */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease-out, opacity 0.3s ease-out, background-color 0.3s ease-out, box-shadow 0.3s ease-out;
    box-shadow: 0 4px 15px rgba(34,197,94,0.3);
    z-index: 998;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 安全区底部偏移 */
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(34,197,94,0.4);
}

/* ==================== Scroll Animations ==================== */
[data-animate] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.65s ease-out, transform 0.65s ease-out;
}
[data-animate].is-visible { opacity: 1; transform: translateY(0); }

/* ==================== Mobile Bottom Navigation ==================== */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-top: 1px solid rgba(0,0,0,0.08);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    z-index: 9998;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
}
.mobile-bottom-nav-list {
    display: flex;
    align-items: center;
    justify-content: space-around;
    margin: 0;
    padding: 0;
    list-style: none;
}
.mobile-bottom-nav-list li { flex: 1; }
.mobile-bottom-nav-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 10px 8px;
    color: rgba(0,0,0,0.5);
    font-size: 11px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}
.mobile-bottom-nav-link:hover,
.mobile-bottom-nav-link.active {
    color: var(--color-primary);
}
.mobile-bottom-nav-link.active svg {
    stroke-width: 2.5;
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

/* —— 移动端 (<768px) —— */
@media (max-width: 767px) {
    .site-footer { display: none; }
    main#main-content { padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px)); }
    .story-grid { grid-template-columns: 1fr; gap: 24px; }
    .story-text { padding-right: 0; }
    .story-heading { font-size: 22px; }
    .stats-title { font-size: 16px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .stat-number { font-size: 32px; }
    .timeline-item { width: 300px; margin-left: 40px; height: 360px; }
    .timeline-tip { display: none; }
    .timeline-year { font-size: 20px; }
}

/* —— 小屏手机增强 (≥400px) —— */
@media (min-width: 400px) {
    :root { --container-px: 24px; }
    .hero-title { font-size: 33px; }
    .hero-stat-value { font-size: 36px; }
    .section-heading { font-size: 30px; }
}

/* —— 平板竖屏 / 大手机 (≥768px) —— */
@media (min-width: 768px) {
    :root {
        --nav-height: 70px;
        --container-px: 28px;
        --section-py: 64px;
    }

    /* 导航：显示桌面菜单 */
    .nav-menu { display: flex; gap: 2px; }
    .nav-menu > li { position: relative; }
    .mobile-toggle { display: none; }
    .mobile-drawer { display: none !important; }
    .mobile-bottom-nav { display: none; }

    /* Hero：左右分栏 */
    .hero-section { min-height: 560px; height: auto; max-height: none; }
    .hero-container {
        flex-direction: row;
        justify-content: space-between;
        gap: 40px;
        padding-top: 100px;
        padding-bottom: 72px;
        text-align: left;
    }
    .hero-left { max-width: 620px; flex: 1; }
    .hero-title { font-size: 40px; line-height: 1.18; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
    .hero-desc { font-size: 15.5px; max-width: 480px; margin-left: 0; margin-right: 0; margin-bottom: 32px; }
    .hero-actions { flex-direction: row; justify-content: flex-start; }
    .hero-actions .btn { width: auto; max-width: none; }

    /* Hero统计卡恢复右侧竖排 */
    .hero-right { flex-direction: column; width: auto; gap: 16px; }
    .hero-stat-card { min-width: 200px; max-width: 240px; padding: 26px 28px; }
    .hero-stat-value { font-size: 40px; }
    .hero-stat-label { font-size: 13px; }

    /* Section标题放大 */
    .section-header { margin-bottom: 48px; }
    .section-heading { font-size: 33px; }
    .section-desc { font-size: 15.5px; max-width: 560px; }
    .section-action { margin-top: 44px; }

    /* Grid恢复多列 */
    .features-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .feature-item { padding: 32px 20px; }
    .feature-icon { width: 66px; height: 66px; margin-bottom: 16px; }
    .feature-item h4 { font-size: 16px; }

    .story-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .story-text { padding-right: 0; }
    .story-heading { font-size: 24px; }
    .stats-title { font-size: 18px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .stat-number { font-size: 36px; }
    .timeline-item { width: 330px; margin-left: 60px; height: 360px; }

    .company-intro-grid { grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
    .company-intro-text h3 { font-size: 22px; margin-bottom: 18px; }
    .company-intro-text p { font-size: 14.5px; margin-bottom: 16px; }
    .company-intro-media img { height: auto; }

    .product-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .product-card { padding: 0 0 30px 0; }

    .factory-grid { gap: 14px; }
    .factory-track { gap: 14px; }
    .factory-card { flex: 0 0 calc(25% - 10.5px); }
    .factory-card img { height: 190px; }

    .quality-grid { grid-template-columns: repeat(2, 1fr); grid-template-rows: 240px repeat(3, 140px); grid-template-areas: "img1 img1" "img2 img3" "img4 img5" "brand img6"; gap: 10px; }

    .cert-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }

    .team-grid { gap: 14px; }
    .team-card--lg img { min-height: 260px; height: 260px; }
    .team-card-group { gap: 8px; }
    .team-card img { height: 100%; }

    /* Footer：2x2网格 */
    .site-footer { padding: 56px 0 0; }
    .footer-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px 32px;
        margin-bottom: 36px;
        border-top: none;
    }
    .footer-col { border-bottom: none; }
    .footer-col-toggle { display: none; }
    .footer-col-content {
        max-height: none;
        overflow: visible;
        padding-bottom: 0;
    }
    .footer-col-brand { padding: 0 0 8px; border-bottom: none; }
    .footer-links a { padding: 7px 0; min-height: auto; }
    .footer-bottom { padding: 24px 0; margin-top: 8px; opacity: 0.4; font-size: 13px; }

    .back-to-top { bottom: 24px; right: 24px; width: 46px; height: 46px; }
}

/* —— 平板横屏 / 小桌面 (≥1024px) —— */
@media (min-width: 1024px) {
    :root {
        --nav-height: 72px;
        --container-px: 32px;
        --section-py: 80px;
    }

    .logo-text { height: 50px; }

    .hero-section { min-height: 620px; }
    .hero-title { font-size: 46px; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
    .hero-container { gap: 52px; }
    .hero-stat-value { font-size: 46px; }

    .section-heading { font-size: 36px; }
    .section-desc { font-size: 16px; }

    .features-grid { grid-template-columns: repeat(4, 1fr); gap: 22px; }
    .feature-item { padding: 36px 20px; }
    .feature-icon { width: 72px; height: 72px; margin-bottom: 18px; }
    .feature-item h4 { font-size: 17px; }
    .feature-item p { font-size: 14px; }

    .story-grid { gap: 56px; }
    .story-heading { font-size: 32px; }
    .stats-title { font-size: 26px; }
    .stats-grid { gap: 28px; }
    .stat-number { font-size: 52px; }
    .timeline-item { width: 420px; margin-left: 60px; }
    .timeline-tip { display: block; }

    .company-intro-grid { gap: 56px; }
    .company-intro-text h3 { font-size: 24px; }
    .company-intro-media img, .company-intro-media video { height: auto; }

    .product-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .product-card { padding: 0 0 34px 0; }

    .factory-grid { gap: 16px; }
    .factory-track { gap: 16px; }
    .factory-card { flex: 0 0 calc(25% - 12px); }
    .factory-card img { height: 220px; }

    .quality-grid { grid-template-columns: repeat(4, 1fr); grid-template-rows: 340px repeat(2, 200px); grid-template-areas: "img1 img1 img1 img1" "img2 img3 img4 img5" "brand img6 img6 img6"; gap: 12px; }

    .cert-grid { grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .cert-card { padding: 42px 26px; }
    .cert-icon { width: 78px; height: 78px; margin-bottom: 20px; }
    .cert-card h4 { font-size: 18px; }

    .team-grid { gap: 16px; }
    .team-card-group { gap: 8px; }
    .team-card--lg img { min-height: 500px; height: auto; }
    .team-card img { height: 100%; }

    /* Footer：4列桌面布局 */
    .site-footer { padding: 68px 0 0; }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 44px; }
    .footer-logo { font-size: 26px; }
    .footer-desc { font-size: 14px; }
    .footer-heading { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 18px; }
    .footer-links li { margin-bottom: 8px; }
    .footer-links a { font-size: 14px; padding: 4px 0; opacity: 0.65; }
    .footer-links a:hover { padding-left: 0; }
    .footer-contact .contact-item { margin-bottom: 10px; padding: 0; }
    .footer-contact span { font-size: 14px; opacity: 0.65; }
    .footer-bottom { padding: 24px 0; opacity: 0.4; }

    .back-to-top { bottom: 32px; right: 32px; width: 48px; height: 48px; }
}

/* —— 大屏增强 (≥1440px) —— */
@media (min-width: 1440px) {
    :root { --container-px: 40px; }
    .container { max-width: 1320px; }
    .hero-title { font-size: 40px; }
    .hero-stat-value { font-size: 40px; }
    .section-heading { font-size: 40px; }
}

/* ==================== Reduced Motion ==================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        will-change: auto !important;
    }
    html { scroll-behavior: auto; }
    [data-animate] { opacity: 1; transform: none; }
}

/* ==================== Print ==================== */
@media print {
    .site-nav, .back-to-top, .mobile-toggle, .mobile-drawer { display: none !important; }
    .hero-section { min-height: auto; padding: 20px 0; contain: unset; }
    .hero-overlay { background: rgba(255,255,255,0.95); }
    .hero-title, .hero-desc { color: #111; text-shadow: none; }
    .hero-stat-card { background: #f5f5f5; box-shadow: none; }
    body { font-size: 12pt; color: #000; }
    [data-animate] { opacity: 1; transform: none; }
    .features-section,.showroom-section,.products-section,.factory-section,.cert-section,.team-section { content-visibility: visible; }
    * { will-change: auto !important; }
}