/* ============================================================
   主样式表 - SecondCycle 二手物品外贸独立站
   全面响应式设计：百分比 + auto-fit + clamp()
   支持从手机到4K显示器的所有分辨率
   使用免费可商用字体：Noto Sans（支持中文、英文、法语）
   ============================================================ */

/* ========== CSS 变量 ========== */
:root {
    --color-primary: #1a3a5c;
    --color-primary-dark: #0f2640;
    --color-primary-light: #2a5a8c;
    --color-accent: #c8a44e;
    --color-accent-dark: #a8843a;
    --color-accent-light: #e0c87a;
    --color-white: #ffffff;
    --color-off-white: #f8f9fa;
    --color-light-gray: #e9ecef;
    --color-gray: #6c757d;
    --color-dark-gray: #343a40;
    --color-dark: #1a1a2e;
    --color-black: #0a0a0a;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-info: #17a2b8;

    /* 字体 - 使用 clamp 在不同屏幕自动缩放 */
    --font-primary: 'Noto Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --text-xs: clamp(0.65rem, 0.75vw, 0.75rem);
    --text-sm: clamp(0.8rem, 0.9vw, 0.875rem);
    --text-base: clamp(0.9rem, 1vw, 1rem);
    --text-lg: clamp(1rem, 1.2vw, 1.125rem);
    --text-xl: clamp(1.1rem, 1.4vw, 1.25rem);
    --text-2xl: clamp(1.25rem, 1.7vw, 1.5rem);
    --text-3xl: clamp(1.5rem, 2.2vw, 1.875rem);
    --text-4xl: clamp(1.75rem, 2.8vw, 2.25rem);
    --text-5xl: clamp(2rem, 3.5vw, 3rem);

    /* 间距 */
    --space-xs: clamp(0.2rem, 0.3vw, 0.25rem);
    --space-sm: clamp(0.4rem, 0.5vw, 0.5rem);
    --space-md: clamp(0.75rem, 1vw, 1rem);
    --space-lg: clamp(1rem, 1.5vw, 1.5rem);
    --space-xl: clamp(1.5rem, 2vw, 2rem);
    --space-2xl: clamp(2rem, 3vw, 3rem);
    --space-3xl: clamp(2.5rem, 4vw, 4rem);
    --space-4xl: clamp(3rem, 6vw, 6rem);

    --radius-sm: clamp(3px, 0.4vw, 4px);
    --radius-md: clamp(6px, 0.8vw, 8px);
    --radius-lg: clamp(8px, 1.2vw, 12px);
    --radius-xl: clamp(12px, 1.6vw, 16px);
    --radius-full: 50%;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 容器 - 使用 min() 自动适配 */
    --container-max: min(1200px, 90vw);
    --container-padding: clamp(0.75rem, 2vw, 1.5rem);
    --section-padding: clamp(2.5rem, 6vw, 5rem);
}

/* ========== 全局重置 ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-dark-gray);
    background-color: var(--color-white);
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: color var(--transition-fast); }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section-padding { padding: var(--section-padding) 0; }
.bg-light { background-color: var(--color-off-white); }
.text-center { text-align: center; }

/* ========== 区块标题 ========== */
.section-header { margin-bottom: var(--space-3xl); }
.section-tag {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
    position: relative;
}
.section-tag::before,
.section-tag::after {
    content: '';
    display: inline-block;
    width: clamp(15px, 3vw, 30px);
    height: 1px;
    background: var(--color-accent);
    vertical-align: middle;
    margin: 0 var(--space-sm);
}
.section-title {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    line-height: 1.3;
}
.section-desc {
    font-size: var(--text-lg);
    color: var(--color-gray);
    max-width: min(700px, 90%);
    margin: 0 auto;
}

/* ========== 按钮系统 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: clamp(0.6rem, 1vw, 0.75rem) clamp(1.2rem, 2vw, 1.75rem);
    font-size: var(--text-base);
    font-weight: 600;
    font-family: var(--font-primary);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.btn-primary { background-color: var(--color-accent); color: var(--color-white); border-color: var(--color-accent); }
.btn-primary:hover { background-color: var(--color-accent-dark); border-color: var(--color-accent-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background-color: transparent; color: var(--color-white); border-color: var(--color-white); }
.btn-outline:hover { background-color: var(--color-white); color: var(--color-primary); }
.btn-outline-white { background-color: transparent; color: var(--color-white); border-color: var(--color-white); }
.btn-outline-white:hover { background-color: var(--color-white); color: var(--color-primary-dark); }
.btn-white { background-color: var(--color-white); color: var(--color-primary); border-color: var(--color-white); }
.btn-white:hover { background-color: var(--color-accent); color: var(--color-white); border-color: var(--color-accent); }
.btn-lg { padding: clamp(0.8rem, 1.2vw, 1rem) clamp(1.8rem, 3vw, 2.5rem); font-size: var(--text-lg); }
.btn-block { width: 100%; display: flex; }

/* ========== 顶部公告栏 ========== */
.top-bar {
    background-color: var(--color-primary-dark);
    color: rgba(255,255,255,0.85);
    font-size: var(--text-sm);
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.top-bar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}
.top-bar-left { display: flex; align-items: center; gap: var(--space-sm); }
.top-bar-left i { color: var(--color-accent); font-size: var(--text-xs); }
.top-bar-divider { color: rgba(255,255,255,0.3); }

/* 语言切换器 */
.language-switcher {
    display: flex;
    gap: 2px;
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-sm);
    padding: 2px;
}
.lang-btn {
    padding: 0.35rem 0.75rem;
    font-size: var(--text-xs);
    font-family: var(--font-primary);
    color: rgba(255,255,255,0.7);
    background: transparent;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.lang-btn:hover { color: var(--color-white); }
.lang-btn.active { background-color: var(--color-accent); color: var(--color-white); font-weight: 600; }

/* ========== 主导航栏 ========== */
.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}
.main-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: clamp(56px, 7vh, 72px);
}

/* Logo */
.logo a { display: flex; align-items: center; gap: var(--space-sm); }
.logo-icon { font-size: var(--text-2xl); color: var(--color-accent); }
.logo-text { font-size: var(--text-xl); font-weight: 700; color: var(--color-primary); }
.logo-highlight { color: var(--color-accent); }

/* 主导航 */
.main-nav .nav-list { display: flex; align-items: center; gap: var(--space-xs); }
.nav-link {
    display: block;
    padding: 0.5rem clamp(0.5rem, 1vw, 1rem);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-dark-gray);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    transform: translateX(-50%);
    width: 0; height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast);
}
.nav-link:hover, .nav-link.active { color: var(--color-primary); }
.nav-link:hover::after, .nav-link.active::after { width: 60%; }

.header-action .btn { padding: 0.6rem 1.5rem; font-size: var(--text-sm); }

/* 移动端菜单按钮（桌面隐藏） */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}
.menu-bar {
    display: block;
    width: clamp(22px, 3vw, 24px);
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}
.mobile-menu-btn.active .menu-bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.active .menu-bar:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active .menu-bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========== 英雄区 Hero Section ========== */
.hero-section {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--color-primary-dark);
}
.hero-slider {
    position: relative;
    width: 100%;
    min-height: clamp(450px, 65vh, 750px);
    overflow: hidden;
}
.hero-slide {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    /* 默认深蓝渐变背景（JS 轮播时会覆盖为其他渐变色） */
    background: linear-gradient(135deg, #0f2640 0%, #1a3a5c 50%, #0b1d30 100%);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    align-items: center;
}
.hero-slide.active { opacity: 1; }
.hero-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(15,38,64,0.92) 0%, rgba(26,58,92,0.78) 60%, rgba(0,0,0,0.65) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: min(760px, 92%);
    width: 100%;
    color: var(--color-white);
    margin: auto;
    padding: clamp(1rem, 3vh, 2rem) 0 clamp(3rem, 6vh, 5rem);
    text-align: center;
}
.hero-badge {
    display: inline-block;
    padding: 0.4rem clamp(0.8rem, 1.5vw, 1.2rem);
    background-color: var(--color-accent);
    color: var(--color-white);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: 999px;
    margin-bottom: var(--space-lg);
    letter-spacing: 1px;
}
.hero-title {
    font-size: clamp(1.6rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: var(--space-lg);
    color: var(--color-white);
}
.hero-subtitle {
    font-size: clamp(0.95rem, 1.2vw, 1.125rem);
    line-height: 1.7;
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--space-xl);
    max-width: min(680px, 100%);
    margin-left: auto;
    margin-right: auto;
}
.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

/* 轮播指示器 */
.hero-dots {
    position: absolute;
    bottom: clamp(1rem, 3vh, 2rem);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--space-sm);
    z-index: 3;
}
.dot {
    width: clamp(8px, 1.5vw, 12px);
    height: clamp(8px, 1.5vw, 12px);
    border-radius: var(--radius-full);
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.dot.active { background: var(--color-accent); transform: scale(1.3); }

/* 特色数据卡片 */
.hero-stats {
    position: relative;
    z-index: 10;
    width: 100%;
    background: linear-gradient(to bottom, rgba(15,38,64,0.3), rgba(15,38,64,0.95));
    padding: clamp(1.5rem, 3vh, 2.5rem) 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}
.stat-card {
    background: rgba(255,255,255,0.97);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}
.stat-card:hover { transform: translateY(-5px); }
.stat-icon { font-size: var(--text-2xl); color: var(--color-accent); margin-bottom: var(--space-sm); }
.stat-number { font-size: var(--text-3xl); font-weight: 800; color: var(--color-primary); line-height: 1.2; }
.stat-number span { font-size: var(--text-base); font-weight: 500; color: var(--color-gray); }
.stat-label { font-size: var(--text-sm); color: var(--color-gray); margin-top: var(--space-xs); }

/* ========== 产品展示区 ========== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(260px, 30vw, 340px), 1fr));
    gap: var(--space-xl);
}
.product-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--color-light-gray);
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.product-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 6 / 5;
}
.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}
.product-card:hover .product-image img { transform: scale(1.05); }
.product-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(26,58,92,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.product-card:hover .product-overlay { opacity: 1; }
.product-info { padding: var(--space-xl); }
.product-category {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}
.product-name { font-size: var(--text-xl); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-sm); }
.product-desc { font-size: var(--text-sm); color: var(--color-gray); margin-bottom: var(--space-md); line-height: 1.6; }
.product-features { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.product-features span { display: flex; align-items: center; gap: 4px; font-size: var(--text-xs); color: var(--color-dark-gray); }
.product-features i { color: var(--color-success); font-size: var(--text-xs); }

/* ========== 为什么选择我们 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(260px, 30vw, 320px), 1fr));
    gap: var(--space-xl);
}
.feature-card {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-light-gray);
    transition: all var(--transition-normal);
}
.feature-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-accent-light); }
.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: clamp(48px, 8vw, 70px);
    height: clamp(48px, 8vw, 70px);
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}
.feature-icon i { font-size: clamp(1.1rem, 2vw, 1.5rem); color: var(--color-white); }
.feature-title { font-size: var(--text-lg); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-sm); }
.feature-desc { font-size: var(--text-sm); color: var(--color-gray); line-height: 1.7; }

/* ========== 品质承诺横幅 ========== */
.quality-banner {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    padding: var(--section-padding) 0;
}
.quality-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}
.quality-text h2 { font-size: var(--text-3xl); font-weight: 700; color: var(--color-white); margin-bottom: var(--space-md); }
.quality-text > p { font-size: var(--text-lg); color: var(--color-accent-light); margin-bottom: var(--space-xl); }
.quality-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.quality-list li { display: flex; align-items: center; gap: var(--space-sm); color: rgba(255,255,255,0.9); font-size: var(--text-base); }
.quality-list i { color: var(--color-accent); font-size: var(--text-sm); }
.quality-image img { border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); width: 100%; }

/* ========== 工厂实力 ========== */
.factory-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
    margin-bottom: var(--space-3xl);
}
.factory-info-cards { display: flex; flex-direction: column; gap: var(--space-lg); }
.info-card {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--color-accent);
    transition: all var(--transition-normal);
}
.info-card:hover { transform: translateX(5px); box-shadow: var(--shadow-md); }
.info-card-icon { font-size: var(--text-2xl); color: var(--color-accent); flex-shrink: 0; margin-top: 4px; }
.info-card-content h4 { font-size: var(--text-lg); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-xs); }
.info-card-content p { font-size: var(--text-sm); color: var(--color-gray); }
.factory-images { display: flex; flex-direction: column; gap: var(--space-md); }
.factory-image-main img { width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.factory-image-sub { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.factory-image-sub img { width: 100%; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }

/* 供应链 */
.supply-chain {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-md);
}
.supply-chain-content h3 { font-size: var(--text-2xl); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-md); }
.supply-chain-content p { font-size: var(--text-base); color: var(--color-gray); line-height: 1.8; margin-bottom: var(--space-lg); }
.supply-chain-list { display: flex; flex-direction: column; gap: var(--space-sm); }
.supply-chain-list li { font-size: var(--text-base); color: var(--color-dark-gray); }
.supply-chain-list li strong { color: var(--color-accent); margin-right: var(--space-sm); }
.supply-chain-image img { width: 100%; border-radius: var(--radius-lg); }

/* ========== 包装物流 ========== */
.container-specs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(240px, 30vw, 300px), 1fr));
    gap: var(--space-xl);
    max-width: min(700px, 100%);
    margin: 0 auto var(--space-3xl);
}
.container-card {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--color-light-gray);
    transition: all var(--transition-normal);
}
.container-card:hover { border-color: var(--color-accent); transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.container-icon { font-size: var(--text-3xl); color: var(--color-accent); margin-bottom: var(--space-md); }
.container-card h3 { font-size: var(--text-2xl); font-weight: 800; color: var(--color-primary); margin-bottom: var(--space-sm); }
.container-detail { font-size: var(--text-lg); color: var(--color-gray); margin-bottom: var(--space-md); }
.container-badge {
    display: inline-block;
    padding: 0.25rem 1rem;
    background: var(--color-accent);
    color: var(--color-white);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: 999px;
}

/* 配比表 */
.ratio-table-wrapper { max-width: min(700px, 100%); margin: 0 auto; }
.ratio-title { text-align: center; font-size: var(--text-xl); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-xl); }
.ratio-table { width: 100%; border-collapse: collapse; background: var(--color-white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.ratio-table thead { background: var(--color-primary); color: var(--color-white); }
.ratio-table th { padding: 1rem 1.5rem; font-weight: 600; text-align: left; }
.ratio-table td { padding: 1rem 1.5rem; border-bottom: 1px solid var(--color-light-gray); color: var(--color-dark-gray); }
.ratio-table tbody tr:hover { background: var(--color-off-white); }
.ratio-table tbody tr:last-child td { border-bottom: none; }

/* ========== 价值主张 ========== */
.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(260px, 30vw, 320px), 1fr));
    gap: var(--space-xl);
}
.value-card {
    padding: var(--space-2xl);
    text-align: center;
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}
.value-card:hover { background: var(--color-white); box-shadow: var(--shadow-lg); border-color: var(--color-light-gray); transform: translateY(-5px); }
.value-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: clamp(48px, 8vw, 65px);
    height: clamp(48px, 8vw, 65px);
    background: rgba(200,164,78,0.1);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}
.value-icon i { font-size: clamp(1.1rem, 2vw, 1.5rem); color: var(--color-accent); }
.value-card h4 { font-size: var(--text-lg); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-sm); }
.value-card p { font-size: var(--text-sm); color: var(--color-gray); line-height: 1.7; }

/* ========== 服务优势 ========== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(clamp(260px, 30vw, 320px), 1fr));
    gap: var(--space-xl);
}
.service-card {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}
.service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.service-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: clamp(48px, 8vw, 65px);
    height: clamp(48px, 8vw, 65px);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}
.service-icon i { font-size: clamp(1.1rem, 2vw, 1.5rem); color: var(--color-white); }
.service-card h4 { font-size: var(--text-lg); font-weight: 700; color: var(--color-primary); margin-bottom: var(--space-sm); }
.service-card p { font-size: var(--text-sm); color: var(--color-gray); line-height: 1.7; }

/* ========== CTA行动号召 ========== */
.cta-section {
    position: relative;
    /* 本地深蓝渐变背景：替代原 placehold.co 占位图 */
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 55%, var(--color-primary-dark) 100%);
    padding: var(--space-4xl) 0;
    text-align: center;
}
.cta-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(15,38,64,0.9), rgba(26,58,92,0.85));
}
.cta-content { position: relative; z-index: 2; color: var(--color-white); }
.cta-content h2 { font-size: var(--text-3xl); font-weight: 700; margin-bottom: var(--space-md); }
.cta-content > p {
    font-size: var(--text-lg);
    color: rgba(255,255,255,0.85);
    margin-bottom: var(--space-xl);
    max-width: min(600px, 90%);
    margin-left: auto; margin-right: auto;
}
.cta-actions { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* ========== 联系我们 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-3xl);
    align-items: start;
}
.contact-form-wrapper {
    background: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-light-gray);
}
.contact-form .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.form-group { margin-bottom: var(--space-lg); }
.form-group label { display: block; font-size: var(--text-sm); font-weight: 600; color: var(--color-dark-gray); margin-bottom: var(--space-xs); }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--text-base);
    font-family: var(--font-primary);
    color: var(--color-dark-gray);
    background: var(--color-off-white);
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(200,164,78,0.15);
    background: var(--color-white);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: #adb5bd; }

/* 联系信息 */
.contact-info-card {
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
}
.contact-info-card h3 { font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--space-xl); color: var(--color-accent-light); }
.contact-info-item { display: flex; gap: var(--space-md); margin-bottom: var(--space-lg); }
.contact-info-icon {
    flex-shrink: 0;
    width: clamp(36px, 5vw, 40px);
    height: clamp(36px, 5vw, 40px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-full);
    font-size: var(--text-base);
    color: var(--color-accent);
}
.contact-info-item h4 { font-size: var(--text-sm); font-weight: 600; margin-bottom: 2px; color: rgba(255,255,255,0.7); }
.contact-info-item p { font-size: var(--text-sm); color: rgba(255,255,255,0.9); }
.social-links { display: flex; gap: var(--space-sm); margin-top: var(--space-xl); padding-top: var(--space-lg); border-top: 1px solid rgba(255,255,255,0.1); }
.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: clamp(36px, 5vw, 40px);
    height: clamp(36px, 5vw, 40px);
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-full);
    color: var(--color-white);
    font-size: var(--text-lg);
    transition: all var(--transition-fast);
}
.social-link:hover { background: var(--color-accent); transform: translateY(-3px); }

/* ========== 页脚 ========== */
.main-footer { background-color: var(--color-primary-dark); color: rgba(255,255,255,0.7); padding: var(--space-3xl) 0 0; }
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--space-3xl);
    padding-bottom: var(--space-2xl);
}
.footer-logo { display: flex; align-items: center; gap: var(--space-sm); margin-bottom: var(--space-md); }
.footer-logo .logo-text { color: var(--color-white); }
.footer-about p { font-size: var(--text-sm); line-height: 1.8; }
.footer-col h4 {
    color: var(--color-white);
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-lg);
    position: relative;
    padding-bottom: var(--space-sm);
}
.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: clamp(20px, 3vw, 30px);
    height: 2px;
    background: var(--color-accent);
}
.footer-links { display: flex; flex-direction: column; gap: var(--space-sm); }
.footer-links a { font-size: var(--text-sm); color: rgba(255,255,255,0.6); transition: all var(--transition-fast); }
.footer-links a:hover { color: var(--color-accent); padding-left: 5px; }

/* 订阅表单 */
.newsletter-form { display: flex; margin-top: var(--space-md); }
.newsletter-form input {
    flex: 1;
    min-width: 0;
    padding: 0.65rem 1rem;
    font-size: var(--text-sm);
    font-family: var(--font-primary);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    background: rgba(255,255,255,0.08);
    color: var(--color-white);
    outline: none;
}
.newsletter-form input::placeholder { color: rgba(255,255,255,0.4); }
.newsletter-form input:focus { border-color: var(--color-accent); }
.newsletter-form button {
    padding: 0.65rem 1rem;
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    cursor: pointer;
    transition: background var(--transition-fast);
}
.newsletter-form button:hover { background: var(--color-accent-dark); }

/* 版权信息 */
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    padding: var(--space-lg) 0;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: var(--text-sm);
}
.footer-bottom-links { display: flex; gap: var(--space-lg); }
.footer-bottom-links a { color: rgba(255,255,255,0.5); }
.footer-bottom-links a:hover { color: var(--color-accent); }

/* ========== 返回顶部按钮 ========== */
.back-to-top {
    position: fixed;
    bottom: clamp(16px, 2.5vw, 30px);
    right: clamp(16px, 2.5vw, 30px);
    width: clamp(38px, 5vw, 45px);
    height: clamp(38px, 5vw, 45px);
    background: var(--color-accent);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-accent-dark); transform: translateY(-3px); }

/* ========== 动画 ========== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.animate-on-scroll.animated { opacity: 1; transform: translateY(0); }

/* ========== 表单消息提示 ========== */
.form-message { padding: 1rem 1.25rem; border-radius: var(--radius-sm); margin-bottom: var(--space-lg); font-size: var(--text-sm); font-weight: 500; transition: all var(--transition-normal); }
.form-message-success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.form-message-error { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* ========== 打印样式 ========== */
@media print {
    .main-header, .top-bar, .back-to-top, .cta-section, .contact-form-wrapper, .newsletter-form, .mobile-menu-btn { display: none !important; }
    body { font-size: 12pt; color: #000; }
    .section-padding { padding: 1rem 0; }
}

/* ========== 页面标题横幅（二级页面使用） ========== */
.page-banner {
    position: relative;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    padding: clamp(3rem, 6vh, 5rem) 0 clamp(2.5rem, 5vh, 4rem);
    text-align: center;
}
.page-banner-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    /* 装饰性斜纹渐变：替代原占位图，避免出现 "1920x400" 字样 */
    background-image:
        repeating-linear-gradient(115deg,
            rgba(255, 255, 255, 0.06) 0px,
            rgba(255, 255, 255, 0.06) 2px,
            transparent 2px,
            transparent 26px),
        radial-gradient(ellipse at 78% 18%, rgba(255, 255, 255, 0.14) 0%, transparent 55%),
        radial-gradient(ellipse at 15% 85%, rgba(255, 255, 255, 0.09) 0%, transparent 60%);
    opacity: 1;
}
.page-banner-content { position: relative; z-index: 2; max-width: min(700px, 90%); margin: 0 auto; }
.page-banner-title { font-size: var(--text-4xl); font-weight: 800; color: var(--color-white); margin-bottom: var(--space-md); line-height: 1.3; }
.page-banner-desc { font-size: var(--text-lg); color: rgba(255,255,255,0.8); line-height: 1.6; }

/* =============================================
   响应式媒体查询 - 仅处理结构性变化
   所有尺寸自适应已在上面通过 clamp/min/auto-fit 实现
   以下只处理：导航折叠、网格从2列变1列、特殊布局
   ============================================= */

/* 平板及以下：导航折叠为汉堡菜单 */
@media (max-width: 1024px) {
    .main-nav {
        display: none;
        position: fixed;
        top: 0; left: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-white);
        z-index: 1000;
        padding: clamp(70px, 10vh, 80px) var(--space-xl) var(--space-xl);
        overflow-y: auto;
    }
    .main-nav.active { display: block; }
    .main-nav .nav-list { flex-direction: column; gap: 0; }
    .main-nav .nav-link { padding: 1rem; font-size: var(--text-lg); border-bottom: 1px solid var(--color-light-gray); }
    .mobile-menu-btn { display: flex; }
    .header-action { display: none; }

    /* 双列布局变单列 */
    .quality-content { grid-template-columns: 1fr; gap: var(--space-2xl); }
    .quality-image { order: -1; }
    .factory-grid { grid-template-columns: 1fr; }
    .supply-chain { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-form .form-row { grid-template-columns: 1fr; }

    /* 缩小间距 */
    .section-header { margin-bottom: var(--space-2xl); }
}

/* 手机：进一步优化 */
@media (max-width: 767px) {
    .top-bar-inner { flex-direction: column; text-align: center; }
    .top-bar-left { font-size: var(--text-xs); }
    .language-switcher { width: 100%; justify-content: center; }
    .lang-btn { flex: 1; text-align: center; padding: 0.4rem 0.5rem; }

    .hero-content { text-align: center; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: min(280px, 90%); }

    .quality-list { grid-template-columns: 1fr; }
    .factory-image-sub { grid-template-columns: 1fr; }
    .info-card { flex-direction: column; text-align: center; align-items: center; }
    .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
    .footer-bottom { flex-direction: column; text-align: center; }
    .ratio-table th, .ratio-table td { padding: 0.75rem 1rem; font-size: var(--text-sm); }
}

/* 超小屏 */
@media (max-width: 480px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-sm); }
    .stat-card { padding: var(--space-sm); }
    .stat-number { font-size: var(--text-xl); }
    .stat-label { font-size: var(--text-xs); }
}

/* ========== 自定义国家/地区下拉组件（按字母 A→Z 分组） ========== */
.country-select { position: relative; }
/* 触发按钮：外观与表单其他输入框保持一致 */
.cs-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding: 0.75rem 1rem;
    font-size: var(--text-base);
    font-family: var(--font-primary);
    color: var(--color-dark-gray);
    background: var(--color-off-white);
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}
.cs-toggle:hover { border-color: var(--color-primary-light); }
.cs-toggle .cs-arrow { font-size: 0.8em; color: var(--color-gray); transition: transform var(--transition-fast); }
.country-select.open .cs-arrow { transform: rotate(180deg); }
.country-select.open .cs-toggle { border-color: var(--color-primary-light); box-shadow: 0 0 0 2px rgba(42,90,140,0.12); }
.cs-toggle.is-selected { color: var(--color-dark); font-weight: 600; }

/* 下拉面板 */
.cs-panel {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    z-index: 50;
    background: var(--color-white);
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    box-shadow: 0 10px 30px rgba(15,38,64,0.18);
    overflow: hidden;
}
.country-select.open .cs-panel { display: block; }

/* 搜索框 */
.cs-search {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.9rem;
    border-bottom: 1px solid var(--color-light-gray);
    background: var(--color-off-white);
}
.cs-search i { color: var(--color-gray); font-size: 0.85em; }
.cs-search input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: var(--text-sm);
    font-family: var(--font-primary);
    color: var(--color-dark-gray);
}

/* 国家列表：字母分组标题 + 圆点选项（参考用户截图样式） */
.cs-list { max-height: 280px; overflow-y: auto; overscroll-behavior: contain; }
.cs-group-label {
    padding: 0.55rem 1rem 0.3rem;
    font-weight: 700;
    font-size: 0.95em;
    color: var(--color-dark);
    background: var(--color-white);
}
.cs-option {
    padding: 0.42rem 1rem 0.42rem 1.6rem;
    font-size: var(--text-sm);
    color: var(--color-dark-gray);
    cursor: pointer;
    position: relative;
    transition: background var(--transition-fast);
}
/* 选项前的圆点（截图样式） */
.cs-option::before {
    content: '';
    position: absolute;
    left: 0.95rem;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-dark-gray);
    opacity: 0.75;
}
.cs-option:hover { background: #eef4fa; color: var(--color-primary); }
.cs-option:hover::before { background: var(--color-primary); opacity: 1; }
.cs-option.selected { background: #e3edf7; color: var(--color-primary-dark); font-weight: 600; }
.cs-option.selected::before { background: var(--color-accent); opacity: 1; }
.cs-no-result { padding: 1rem; text-align: center; color: var(--color-gray); font-size: var(--text-sm); display: none; }

/* 移动端：面板改为底部弹出更易操作 */
@media (max-width: 767px) {
    .cs-panel { position: fixed; left: 4%; right: 4%; top: auto; bottom: 0; border-radius: 12px 12px 0 0; z-index: 200; }
    .cs-list { max-height: 52vh; }
}

/* ========== 国家列表多语言显示控制 ========== */
/* 默认（英文页面）：只显示英文名，隐藏翻译 */
.cs-option .cs-alt { display: none; }
/* 中文页面：英文后空一格显示中文（如 "Afghanistan 阿富汗"） */
html[lang="zh-CN"] .cs-option .cs-zh { display: inline; margin-left: 0.5em; color: var(--color-gray); }
/* 法语页面：隐藏英文名，仅显示法文名（排列顺序仍按英文 A→Z） */
html[lang="fr"] .cs-option .cs-en { display: none; }
html[lang="fr"] .cs-option .cs-fr { display: inline; }