/* ============================================    澜科创科技官网 - 主样式表    LightKeep Tech Website - Main Stylesheet    ============================================ */

/* 隐藏类 */
.hidden {
    display: none !important;
}

/* ========== CSS Variables / CSS变量 ========== */
:root {
    /* Colors - Primary */
    --color-primary: #1A1A1A;
    --color-dark: #333333;
    --color-medium: #666666;
    --color-light: #999999;
    --color-accent: #02a0e9;
    --color-accent-hover: #0284c7;
    --color-accent-light: #e0f2fe;

    /* Colors - Background */
    --color-bg-white: #FFFFFF;
    --color-bg-off-white: #f9f9f9;
    --color-bg-light: #F5F5F5;
    --color-bg-dark: #1A1A1A;

    /* Colors - Border */
    --color-border: #E5E5E5;
    --color-border-dark: #DDDDDD;

    /* Colors - Functional */
    --color-success: #34C759;
    --color-warning: #FF9500;
    --color-error: #FF3B30;

    /* Typography */
    --font-family-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, sans-serif;
    --font-family-en: "SF Pro Display", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-family-mono: "SF Mono", "Roboto Mono", monospace;

    /* Font Sizes */
    --font-size-hero: 64px;
    --font-size-h1: 48px;
    --font-size-h2: 36px;
    --font-size-h3: 24px;
    --font-size-h4: 20px;
    --font-size-body-lg: 18px;
    --font-size-body: 16px;
    --font-size-body-sm: 14px;
    --font-size-caption: 12px;

    /* Line Heights */
    --line-height-tight: 1.1;
    --line-height-snug: 1.2;
    --line-height-normal: 1.3;
    --line-height-relaxed: 1.7;

    /* Spacing */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 72px;
    --space-4xl: 96px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 8px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* Layout */
    --header-height: 72px;
    --container-max: 1440px;
    --container-padding: 24px;
}

/* ========== Reset & Base Styles / 重置与基础样式 ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-cn);
    font-size: var(--font-size-body);
    line-height: var(--line-height-relaxed);
    color: var(--color-dark);
    background-color: var(--color-bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ========== Typography / 排版 ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--line-height-normal);
    color: var(--color-primary);
}

h1 { font-size: var(--font-size-h1); font-weight: 700; }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); font-weight: 500; }

.text-hero {
    font-size: var(--font-size-hero);
    font-weight: 700;
    line-height: var(--line-height-tight);
}

.text-en {
    font-family: var(--font-family-en);
}

.text-accent {
    color: var(--color-accent);
}

.text-center {
    text-align: center;
}

.text-light {
    color: var(--color-light);
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
    margin-bottom: var(--space-xl);
}

.en-text {
    font-family: var(--font-family-en);
    font-size: var(--font-size-body-sm);
    color: var(--color-light);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ========== Layout / 布局 ========== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-3xl) 0;
}

.section-gray {
    background-color: var(--color-bg-off-white);
}

.section-white {
    background-color: var(--color-bg-white);
}

.grid {
    display: grid;
    gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }


.flexall {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: center;
    align-items: center;
}

.image-169 {
    aspect-ratio: 16 / 9;
}


.image-43 {
    aspect-ratio: 4 / 3;
}


.image-164 {
    aspect-ratio: 16 / 4;
}

/* ========== Header / 头部导航 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg-white);
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.logo img {
    width: 100%;
    height: 50px;
    display: block;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-accent), #FF8F5C);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-size: var(--font-size-body);
    color: var(--color-dark);
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
}

.header-cta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.lang-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-medium);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-normal);
}

.lang-btn:hover,.lang-btn.active {
    color: var(--color-accent);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-xs);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition-normal);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-white);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav-link {
    display: block;
    padding: var(--space-sm) 0;
    font-size: var(--font-size-body-lg);
    color: var(--color-dark);
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link:hover {
    color: var(--color-accent);
}

/* ========== Buttons / 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 12px 24px;
    font-size: var(--font-size-body);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
    background: var(--color-accent);
    color: white;
}

.btn-white {
    background: white;
    color: var(--color-primary);
}

.btn-white:hover {
    background: var(--color-bg-off-white);
    transform: translateY(-2px);
}

.btn-dark {
    background: var(--color-primary);
    color: white;
}

.btn-dark:hover {
    background: var(--color-dark);
}

.btn-lg {
    padding: 16px 32px;
    font-size: var(--font-size-body-lg);
}

.btn-sm {
    padding: 8px 16px;
    font-size: var(--font-size-body-sm);
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-full);
}

/* ========== Hero Section / 首屏区域 ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    flex-direction: column;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: center;
    padding-top: var(--header-height);
    background: linear-gradient(135deg, #FFF 0%, #F8F8F8 50%, #FFF 100%);
    position: relative;
    overflow: hidden;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(46, 95, 211, 0.5);
    z-index: 1;
}

.hero-content {
    position: relative;
    display: flex;
    align-items: center;
    flex-direction: column;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: center;
    z-index: 2;
    color: white;
}

.hero-content h1 {
    color: white;
    font-size: clamp(36px, 5vw, var(--font-size-hero));
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-md);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 8px 16px;
    background: rgba(2, 160, 233, 0.2);
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--font-size-body-sm);
    margin-bottom: var(--space-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-badge svg {
    fill: white;
}

.hero-subtitle {
    font-size: var(--font-size-body-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-xl);
    text-align: center;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-buttons .btn {
    gap: var(--space-xs);
}

.hero-buttons .btn svg {
    fill: currentColor;
}

.hero-buttons .btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.hero-buttons .btn-outline:hover {
    background: white;
    color: var(--color-primary);
}

.hero-scroll {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: white;
    font-size: var(--font-size-body-sm);
    z-index: 2;
    animation: bounce 2s ease-in-out infinite;
}

.hero-scroll svg {
    width: 24px;
    height: 24px;
    fill: white;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-20px) translateX(-50%); }
    60% { transform: translateY(-10px) translateX(-50%); }
}

/* Hero Wave */
.hero-wave-container{
    position: absolute;
    bottom: 0 !important;
    left: 0;
    width: 100% !important;
    padding: 0 !important;
    z-index: 3;
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: flex-end;
    align-items: baseline;
    opacity: 0.1;
}
.hero-wave {
    height: 100%;
    width: 100%;
}

/* Hero Decoration */
.hero-decoration {
    position: absolute;
    top: 20%;
    right: 10%;
    width: 500px;
    height: 500px;
    opacity: 0.1;
}

.hero-decoration-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--color-accent);
    animation: pulse 4s ease-in-out infinite;
}

.hero-decoration-circle:nth-child(1) {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.hero-decoration-circle:nth-child(2) {
    width: 400px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 0.5s;
}

.hero-decoration-circle:nth-child(3) {
    width: 500px;
    height: 500px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 1s;
}

@keyframes pulse {
    0%, 100% { opacity: 0.1; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.3; transform: translate(-50%, -50%) scale(1.05); }
}

/* ========== Stats Section / 数据统计 ========== */
.stats {
    padding: var(--space-2xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.stat-item,
.stat-card {
    text-align: center;
    padding: var(--space-lg);
}

.stat-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--color-accent);
}

.stat-icon img {
    width: 32px;
    height: 32px;
}

.stat-value,
.stat-number {
    font-size: var(--font-size-h2);
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-family-en);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--font-size-body);
    color: var(--color-medium);
    margin-bottom: 4px;
}

.stat-label-en {
    font-size: var(--font-size-body-sm);
    color: var(--color-light);
    font-family: var(--font-family-en);
}

/* ========== About Section / 关于我们 ========== */
.about {
    padding: var(--space-4xl) 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.about-content {
    max-width: 560px;
}

.about-tag {
    display: inline-block;
    font-size: var(--font-size-body-sm);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
}

.about-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
}

.about-desc {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
    margin-bottom: var(--space-xl);
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.about-feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-body);
    color: var(--color-dark);
}

.about-feature-icon {
    width: 24px;
    height: 24px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.about-feature-icon svg {
    width: 12px;
    height: 12px;
    fill: white;
}

.about-image {
    position: relative;
}

.about-image-main {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image-main img {
    width: 100%;
    height: auto;
}

.about-badge {
    position: absolute;
    bottom: -20px;
    left: -20px;
    background: var(--color-accent);
    color: white;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-badge-value {
    font-size: var(--font-size-h2);
    font-weight: 700;
    font-family: var(--font-family-en);
}

.about-badge-label {
    font-size: var(--font-size-body-sm);
}

/* ========== Services Section / 服务优势 ========== */
.services {
    padding: var(--space-4xl) 0;
}

.services-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.service-card {
    background: var(--color-bg-white);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-sm);
}

.service-font {
    font-size: var(--font-size-h2);
    font-weight: 400;
}

.service-icon svg {
    width: 48px;
    height: 48px;
    fill: var(--color-accent);
}

.service-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.service-desc {
    font-size: var(--font-size-body);
    color: var(--color-medium);
    margin-bottom: var(--space-lg);
}

.service-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.service-tag {
    padding: 6px 12px;
    background: var(--color-bg-light);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-caption);
    color: var(--color-medium);
}

/* ========== Products Section / 产品展示 ========== */
.products {
    padding: var(--space-4xl) 0;
}

.products-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.products-filter {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.product-card {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    background: white;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-badge {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    padding: 6px 12px;
    background: var(--color-accent);
    color: white;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-caption);
}

.product-info {
    padding: var(--space-md);
}

.product-category {
    font-size: var(--font-size-caption);
    color: var(--color-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-xs);
}

.product-name {
    font-size: var(--font-size-body-lg);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.product-features {
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
}

.products-cta {
    text-align: center;
    margin-top: var(--space-xl);
}

/* ========== Factory Section / 工厂实力 ========== */
.factory {
    padding: var(--space-4xl) 0;
}

/* ========== Product Detail Section / 产品详情 ========== */
.product-detail {
    padding: var(--space-4xl) 0;
}

.product-detail-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0px;
    margin-bottom: var(--space-md);
    align-items: start;
}

.product-images {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
}

.image-gallery {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
}

.thumbnail-container {
    flex: 0 0 62px;
    display: flex;
    flex-direction: column;
    height: 500px;
    position: relative;
}

.thumbnail-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    overflow-y: auto;
    padding: 0;
    scroll-behavior: smooth;
    margin-top: 35px;
    margin-bottom: 35px;
    /* 隐藏滚动条但保留功能 */
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;     /* Firefox */
}

/* 隐藏滚动条 - WebKit (Chrome, Safari) */
.thumbnail-list::-webkit-scrollbar {
    display: none;
}

.thumbnail-item {
    width: 62px;
    height: 62px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.thumbnail-item:hover {
    border-color: var(--color-primary);
}

.thumbnail-item img {
    width: 60px;
    height: 60px;
    object-fit: contain;
    background: #fff;
    width: 60px;
    height: 60px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.thumbnail-item.active img {
    border: solid 1px rgba(0, 123, 255, 0.3);
}

.thumbnail-scroll-btn {
    position: absolute;
    left: 0;
    right: 0;
    height: 30px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    z-index: 10;
}

.thumbnail-scroll-btn:hover {
    background: rgba(255, 255, 255, 1);
    box-shadow: var(--shadow-sm);
}

.thumbnail-scroll-up {
    top: 0;
}

.thumbnail-scroll-down {
    bottom: 0;
}

.thumbnail-scroll-btn svg {
    width: 16px;
    height: 16px;
    fill: var(--color-text);
}

.main-image-container {
    flex: 1;
    height: 500px;
}

.main-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    border-radius: var(--radius-lg);
}

.main-image img {
    object-fit: contain;
    max-width: 100%;
    max-height: 100%;
}

.thumbnails {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
}

.thumbnails img {
    flex: 0 0 calc(33.333% - 8px);
    aspect-ratio: 1;
    background: var(--color-bg-off-white);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    object-fit: contain;
    padding: var(--space-sm);
}

.thumbnails img.active,
.thumbnails img:hover {
    border-color: var(--color-accent);
    transform: scale(1.05);
}

.product-info {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

.product-detail-info {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.product-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.product-price {
    margin-bottom: var(--space-lg);
}

.price-value {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--color-accent);
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

.product-feature {
    padding: 8px 16px;
    background: #f9f9f9;
    color: #333;
    border-radius: var(--radius-full);
    font-size: var(--font-size-body-sm);
}

.product-description {
    font-size: var(--font-size-body);
    color: var(--color-medium);
    margin-bottom: var(--space-xl);
    line-height: var(--line-height-relaxed);
}

.product-options {
    margin-bottom: var(--space-xl);
}

.option-group {
    margin-bottom: var(--space-lg);
}

.option-group h4 {
    font-size: var(--font-size-body);
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.option-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.option-item {
    padding: var(--space-sm) var(--space-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    font-size: var(--font-size-body);
}


.color-options {
    display: flex;
    gap: var(--space-md);
}

.color-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.color-preview {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid transparent;
    transition: all var(--transition-normal);
}

.color-option:hover .color-preview,
.color-option.active .color-preview {
    border-color: var(--color-accent);
}

.color-option span {
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
}

.color-option.active span {
    color: var(--color-accent);
}

.product-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.product-actions .btn {
    flex: 1;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-body);
    font-weight: 600;
}

.add-to-cart {
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.add-to-cart:hover {
    background: var(--color-accent-hover);
}

.favorite {
    background: var(--color-bg-light);
    color: var(--color-medium);
    border: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.favorite:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.favorite svg {
    margin-right: var(--space-xs);
    width: 16px;
    height: 16px;
}

.product-services {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.service-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
}

.service-item svg {
    width: 16px;
    height: 16px;
    color: var(--color-success);
}

.product-details-tabs {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.tab-btn {
    padding: var(--space-sm) var(--space-lg);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    font-size: var(--font-size-body);
    color: var(--color-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.tab-btn:hover,
.tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.tab-content {
    min-height: 300px;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-panel h3 {
    font-size: var(--font-size-h3);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--color-primary);
}

.tab-panel p {
    font-size: var(--font-size-body);
    color: var(--color-medium);
    margin-bottom: var(--space-md);
    line-height: var(--line-height-relaxed);
}

.tab-panel ul {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.tab-panel ul li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-body);
    color: var(--color-medium);
}

.tab-panel ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: var(--font-size-body-lg);
    font-weight: 700;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--space-lg);
}

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

.spec-table td {
    padding: var(--space-sm) 0;
    font-size: var(--font-size-body);
}

.spec-table td:first-child {
    font-weight: 600;
    color: var(--color-primary);
    width: 30%;
}

.spec-table td:last-child {
    color: var(--color-medium);
}

.parameters-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--space-md);
}

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

.parameters-table tr:first-child {
    border-top: 1px solid var(--color-border);
}

.parameters-table td {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-body);
}

.parameters-table .param-name {
    font-weight: 600;
    color: var(--color-primary);
    width: 40%;
    background-color: var(--color-bg-off-white);
}

.parameters-table .param-value {
    color: var(--color-medium);
}

/* ========== Related Products / 相关产品推荐 ========== */
.related-products {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-off-white);
}

.related-products .section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.related-products .products-grid {
    grid-template-columns: repeat(4, 1fr);
}

/* ========== Responsive Design / 响应式设计 ========== */
@media (max-width: 768px) {
    .product-detail-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .product-actions {
        flex-direction: column;
    }
    
    .tabs {
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }
    
    .related-products .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .related-products .products-grid {
        grid-template-columns: 1fr;
    }
    
    .thumbnails {
        flex-wrap: wrap;
    }
    
    .thumbnails img {
        flex: 1 1 calc(33.333% - 8px);
    }
}

.factory-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.factory-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.factory-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.factory-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.factory-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.factory-card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    color: white;
}

.factory-card-title {
    color: white;
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.factory-card-desc {
    color: white;
    font-size: var(--font-size-body-sm);
    opacity: 0.9;
}

/* ========== CTA Section / 行动召唤 ========== */
.cta {
    padding: var(--space-4xl) 0;
    color: black;
}

.cta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.cta-content {
    max-width: 500px;
}

.cta-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: black;
}

.cta-desc {
    font-size: var(--font-size-body-lg);
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.cta-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.hero-cta {
    display: flex;
    justify-content: center; 
    margin-top: var(--space-xl);
    gap: var(--space-md);
}

.cta-info-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-body-lg);
}

.cta-info-icon {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cta-info-icon svg {
    width: 20px;
    height: 20px;
    fill: var(--color-accent);
}

.cta-form {
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    color: var(--color-dark);

    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-bounce);
}

.cta-form-title {
    font-size: var(--font-size-h3);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    text-align: center;
}

.cta-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.cta-form-group {
    margin-bottom: var(--space-md);
}

.cta-form-label {
    display: block;
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
    margin-bottom: var(--space-xs);
}

.cta-form-input,
.cta-form-select,
.cta-form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-body);
    transition: border-color var(--transition-fast);
}

.cta-form-input:focus,
.cta-form-select:focus,
.cta-form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

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

/* ========== Footer / 页脚 ========== */
.footer {
    background: var(--color-bg-dark);
    color: white;
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    font-size: var(--font-size-h3);
    font-weight: 700;
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.footer-logo-icon {
    width: 32px;
    height: 32px;
    background: url('/static/images/logo/icon.png') no-repeat center center;
    background-size: cover;
    border-radius: var(--radius-sm);
}

.footer-desc {
    font-size: var(--font-size-body-sm);
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--space-lg);
}

.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.footer-social-link {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-normal);
}

.footer-social-link:hover {
    background: var(--color-accent);
}

.footer-social-link svg {
    width: 20px;
    height: 20px;
    fill: white;
}

.footer-title {
    font-size: var(--font-size-body-lg);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-link {
    font-size: var(--font-size-body-sm);
    color: rgba(255,255,255,0.7);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-accent);
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: var(--font-size-body-sm);
    color: rgba(255,255,255,0.7);
}

.footer-contact-icon {
    width: 20px;
    height: 20px;
    fill: var(--color-accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    font-size: var(--font-size-body-sm);
    color: rgba(255,255,255,0.5);
}

.footer-legal {
    display: flex;
    gap: var(--space-lg);
}

.footer-legal-link {
    font-size: var(--font-size-body-sm);
    color: rgba(255,255,255,0.5);
    transition: color var(--transition-fast);
}

.footer-legal-link:hover {
    color: white;
}

/* ========== Page Header / 页面头部 ========== */
.page-header {
    padding-top: calc(var(--header-height) + var(--space-3xl));
    padding-bottom: var(--space-2xl);
    background: var(--color-bg-off-white);
    text-align: center;
}

.page-header-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.page-header-subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
}

.page-header-breadcrumb {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
    font-size: var(--font-size-body-sm);
    color: var(--color-light);
}

.page-header-breadcrumb a {
    color: var(--color-medium);
}

.page-header-breadcrumb a:hover {
    color: var(--color-accent);
}

/* ========== Breadcrumb Navigation / 面包屑导航 ========== */
.breadcrumb-nav {
    padding: var(--space-lg) 0;
    background: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
}

.breadcrumb a {
    color: var(--color-medium);
    transition: var(--transition-normal);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

/* ========== Process Section / 流程展示 ========== */
.process {
    padding: var(--space-4xl) 0;
}

.process-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.process-grid {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.process-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 80px;
    right: 80px;
    height: 2px;
    background: var(--color-border);
}

.process-step {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.process-number {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-md);
    background: var(--color-bg-white);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-h2);
    font-weight: 700;
    color: var(--color-accent);
    font-family: var(--font-family-en);
}

.process-step:hover .process-number {
    background: var(--color-accent);
    color: white;
}

.process-title {
    font-size: var(--font-size-body-lg);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.process-desc {
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
    max-width: 200px;
    margin: 0 auto;
}

/* ========== Features Grid / 特性网格 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.feature-item {
    padding: var(--space-xl);
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-accent-light), rgba(2, 160, 233, 0.05));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    fill: var(--color-accent);
}

.feature-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.feature-desc {
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
}

/* ========== Contact Info / 联系信息 ========== */
.contact-info {
    padding: var(--space-4xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}

.contact-details {
    padding: var(--space-xl);
    background: var(--color-bg-off-white);
    border-radius: var(--radius-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 32px;
    height: 32px;
    filter: invert(39%) sepia(98%) saturate(1073%) hue-rotate(184deg) brightness(90%) contrast(90%);
}

.contact-icon img {
    width: 32px;
    height: 32px;
    filter: invert(39%) sepia(98%) saturate(1073%) hue-rotate(184deg) brightness(90%) contrast(90%);
}

.contact-label {
    font-size: var(--font-size-body-sm);
    color: var(--color-light);
    margin-bottom: var(--space-xs);
}

.contact-value {
    font-size: var(--font-size-body-lg);
    font-weight: 500;
}

.contact-map {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.contact-map-placeholder {
    text-align: center;
    color: var(--color-light);
}

/* ========== Certifications / 认证展示 ========== */
.certifications {
    padding: var(--space-3xl) 0;
}

.certifications-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-xl);
}

.certification-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm);
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    min-width: 150px;
    box-shadow: var(--shadow-sm);
}

.certification-icon {
    width: 64px;
    height: 64px;
    background: var(--color-bg-off-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-sm);
}

.certification-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--color-accent);
}

.certification-name {
    font-size: var(--font-size-body-sm);
    font-weight: 600;
    color: var(--color-dark);
}

/* ========== Global Factories / 全球工厂 ========== */
.global-factories {
    padding: var(--space-4xl) 0;
    background-color: var(--color-bg-white);
    position: relative;
}

.factories-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
    position: relative;
}

.factories-header .en-text {
    display: block;
    font-size: var(--font-size-body-sm);
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    
}

.factories-header .section-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
}

.factories-header .section-subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
    max-width: 600px;
    margin: 0 auto;
}

.factories-stats {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--space-4xl);
    margin-bottom: var(--space-3xl);
    justify-content: space-around;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 56px;
    font-weight: 800;
    line-height: 1;
    color: #000000;
}

.stat-unit {
    font-size: 24px;
    font-weight: 600;
    color: #000000;
    margin-left: 4px;
}

.stat-label {
    display: block;
    font-size: var(--font-size-body);
    color: var(--color-medium);
    margin-top: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.factories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.factory-card-v2 {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-bounce);
}

.factory-card-v2:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.factory-map {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: var(--color-bg-light);
}

.factory-map iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.map-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-off-white) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    color: var(--color-light);
}

.map-placeholder i {
    font-size: 48px;
    color: var(--color-accent);
    opacity: 0.5;
}

.map-placeholder.vietnam {
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
}

.map-placeholder.vietnam i {
    color: var(--secondary);
    opacity: 0.5;
}

.factory-map-overlay {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
}

.factory-badge {
    display: inline-block;
    padding: 6px 12px;
    background: var(--color-accent);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.factory-badge.vietnam {
    background: var(--secondary);
}

.factory-badge-img {
    width: 48px;
    height: 32px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.factory-content {
    padding: var(--space-xl);
}

.factory-flag {
    width: 48px;
    height: 32px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-sm);
}

.flag-icon {
    width: 100%;
    height: 100%;
}

.factory-name {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
}

.factory-area {
    font-size: var(--font-size-h4);
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
}

.area-number {
    font-weight: 700;
}

.area-unit {
    font-weight: 400;
    opacity: 0.8;
}

.factory-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.factory-detail-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
}

.factory-detail-item img {
    filter: invert(39%) sepia(98%) saturate(1073%) hue-rotate(184deg) brightness(90%) contrast(90%);
}

.factory-detail-item i {
    color: var(--color-accent);
    margin-top: 3px;
    flex-shrink: 0;
}

/* ========== Animations / 动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ========== Responsive Design / 响应式设计 ========== */
@media (max-width: 1024px) {
    :root {
        --font-size-hero: 48px;
        --font-size-h1: 36px;
        --font-size-h2: 28px;
        --font-size-h3: 20px;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .factories-grid {
        grid-template-columns: 1fr;
    }

    .factories-stats {
        gap: var(--space-xl);
    }

    .stat-number {
        font-size: 40px;
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid {
        gap: var(--space-xl);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cta-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .hero-stats {
        gap: var(--space-xl);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-hero: 32px;
        --font-size-h1: 28px;
        --font-size-h2: 24px;
        --font-size-h3: 18px;
        --header-height: 64px;
    }

    .nav {
        display: none;
    }

    .header-cta .btn {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-lg);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .factory-grid {
        grid-template-columns: 1fr;
    }

    .factories-stats {
        gap: var(--space-xl);
    }

    .stat-number {
        font-size: 32px;
    }

    .factory-detail-item span {
        word-break: break-word;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .about-badge {
        position: static;
        margin-top: var(--space-md);
    }

    .process-grid {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .process-grid::before {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }

    .cta-form-row {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--space-2xl) 0;
    }
}

/* ========== Customer Wall / 客户标志墙 ========== */
.customer-wall {
    padding: var(--space-4xl) 0;
    background-color: var(--color-bg-white);
    position: relative;
}

.customer-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.customer-header .en-text {
    display: block;
    font-size: var(--font-size-body-sm);
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.customer-header .section-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
}

.customer-header .section-subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
    max-width: 600px;
    margin: 0 auto;
}

.customer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-xl);
    align-items: center;
}

.customer-item {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-sm);
    aspect-ratio: 19 / 9;
    transition: all var(--transition-bounce);
}

.customer-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.customer-logo {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .customer-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--space-md);
    }
    
    .customer-item {
        padding: var(--space-sm);
        aspect-ratio: 19 / 9;
    }
    
    .customer-logo {
        max-height: 100%;
    }
}


/* ========== cert Wall / 客户标志墙 ========== */
.cert-wall {
    padding: var(--space-4xl) 0;
    background-color: var(--color-bg-white);
    position: relative;
}

.cert-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.cert-header .en-text {
    display: block;
    font-size: var(--font-size-body-sm);
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.cert-header .section-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
}

.cert-header .section-subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
    max-width: 600px;
    margin: 0 auto;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-xl);
    align-items: center;
}

.cert-item {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-sm);
    aspect-ratio: 19 / 9;
    transition: all var(--transition-bounce);
    flex-direction: column;
}

.cert-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.cert-item img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .cert-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--space-md);
    }
    
    .cert-item {
        padding: var(--space-sm);
        aspect-ratio: 19 / 9;
    }
    
    .cert-logo {
        max-height: 100%;
    }
}


/* ========== Gallery / 照片展示墙 ========== */
.gallery {
    padding: var(--space-4xl) 0;
    background-color: var(--color-bg-light);
    position: relative;
}

.gallery-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.gallery-header .en-text {
    display: block;
    font-size: var(--font-size-body-sm);
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.gallery-header .section-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
}

.gallery-header .section-subtitle {
    font-size: var(--font-size-body-lg);
    color: var(--color-medium);
    max-width: 600px;
    margin: 0 auto;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

/* R&D Grid for 4 columns */
.rd-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

/* SVG Icon Styles */
.w3-capability-icon,
.w3-feature-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.service-icon,
.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.w3-capability-icon img,
.w3-feature-icon img,
.service-icon img,
.stat-icon img {
    filter: invert(39%) sepia(98%) saturate(1073%) hue-rotate(184deg) brightness(90%) contrast(90%);
    width: 48px;
    height: 48px;
}

.rd-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    aspect-ratio: 16 / 9;
}

.rd-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.rd-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.rd-card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: white;
}

.rd-card-title {
    color:white;
    font-size: var(--font-size-h5);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.rd-card-desc {
    font-size: var(--font-size-body-sm);
    opacity: 0.9;
}

.gallery-item {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-bounce);
}

.gallery-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.gallery-thumbnail {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.gallery-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-item:hover .gallery-thumbnail img {
    transform: scale(1.05);
}

.gallery-info {
    padding: var(--space-lg);
}

.gallery-title {
    font-size: var(--font-size-h4);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
}

.gallery-desc {
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
    line-height: 1.5;
}

/* Responsive adjustments for gallery */
@media (max-width: 768px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--space-lg);
    }
    
    .rd-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--space-lg);
    }
    
    .gallery-thumbnail {
        aspect-ratio: 4 / 3;
    }
    
    .rd-card {
        aspect-ratio: 4 / 3;
    }
    
    .gallery-info {
        padding: var(--space-md);
    }
    
    .rd-card-overlay {
        padding: var(--space-md);
    }
}

/* ========== Global Factories / 全球制造基地 ========== */
.factories {
    padding: var(--space-4xl) 0;
    background-color: var(--color-bg-light);
    position: relative;
}


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

.factory-card {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-bounce);
}

.factory-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.factory-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.factory-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.factory-card:hover .factory-image img {
    transform: scale(1.05);
}

.factory-info {
    padding: var(--space-xl);
}

.factory-badge {
    display: inline-block;
    padding: 6px 12px;
    background: var(--color-accent);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-md);
}

.factory-title {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-lg);
}

.factory-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.factory-detail {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.detail-label {
    font-size: var(--font-size-body-sm);
    font-weight: 600;
    color: var(--color-medium);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.detail-value {
    font-size: var(--font-size-body);
    color: var(--color-dark);
    line-height: 1.5;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .factories-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .factory-info {
        padding: var(--space-lg);
    }
    
    .factory-image {
        aspect-ratio: 4 / 3;
    }
}

/* ========== Certifications / 资质证书 ========== */
.certifications {
    padding: var(--space-4xl) 0;
    position: relative;
}

.certifications-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.certification-item {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-bounce);
    display: flex;
    flex-direction: column;
}

.certification-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.certificate-image-container {
    position: relative;
    width: 100%;
    padding-bottom: 125%; /* 3/4 宽高比例 */
    overflow: hidden;
    background-color: #fff;
}

.certificate-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.5s ease;
}

.certification-item:hover .certificate-image {
    transform: scale(1.05);
}

.certificate-info {
    padding: var(--space-lg);
    text-align: center;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.certificate-title {
    font-size: var(--font-size-h5);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-xs);
}

.certificate-desc {
    font-size: var(--font-size-body-sm);
    color: var(--color-medium);
    line-height: 1.5;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }
    
    .certificate-info {
        padding: var(--space-md);
    }
}

@media (max-width: 480px) {
    .certifications-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== Utilities / 工具类 ========== */
.visible { display: block !important; }
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.pt-sm { padding-top: var(--space-sm); }
.pt-md { padding-top: var(--space-md); }
.pt-lg { padding-top: var(--space-lg); }
.pt-xl { padding-top: var(--space-xl); }

.pb-sm { padding-bottom: var(--space-sm); }
.pb-md { padding-bottom: var(--space-md); }
.pb-lg { padding-bottom: var(--space-lg); }
.pb-xl { padding-bottom: var(--space-xl); }

/* 产品编辑页面样式 */
.current-images {
    margin-top: 10px;
}

.current-images h4 {
    margin-bottom: 10px;
}

.image-item {
    display: inline-block;
    margin-right: 10px;
    margin-bottom: 10px;
    position: relative;
}

.image-item img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: #f8f8f8;
}

.delete-image-btn {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #dc3545;
    color: white;
    border: 2px solid white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.delete-image-btn:hover {
    background: #c82333;
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.delete-image-btn svg {
    width: 18px;
    height: 18px;
    fill: white;
}

/* 后台首页样式 */
.admin-dashboard {
    padding: var(--space-lg);
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin-top: var(--space-md);
}

.dashboard-header {
    margin-bottom: var(--space-xl);
    text-align: center;
}

.dashboard-header h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
}

.dashboard-header p {
    font-size: 16px;
    color: var(--color-medium);
    max-width: 600px;
    margin: 0 auto;
}

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.dashboard-card {
    background: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
    padding: var(--space-lg);
    transition: all 0.3s ease;
    border: 1px solid var(--color-border);
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.dashboard-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 24px;
}

.category-icon {
    background: linear-gradient(135deg, var(--color-accent), #0284c7);
    color: white;
}

.product-icon {
    background: linear-gradient(135deg, var(--color-success), #22c55e);
    color: white;
}

.card-content {
    flex: 1;
}

.card-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
}

.card-content p {
    font-size: 14px;
    color: var(--color-medium);
    margin-bottom: var(--space-md);
    line-height: 1.4;
}

.card-content .btn {
    margin-top: var(--space-sm);
}

.dashboard-section {
    margin-top: var(--space-2xl);
}

.dashboard-section h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-accent);
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.quick-action-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--color-dark);
}

.quick-action-item:hover {
    background: var(--color-bg-off-white);
    border-color: var(--color-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.quick-action-item svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

.quick-action-item span {
    font-size: 14px;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .dashboard-cards {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .admin-dashboard {
        padding: var(--space-md);
    }
}