/* ============================================================================
   奢侈品皮具B2B独立站 - 全站主样式表
   ============================================================================
   设计理念：极简高级、轻奢哑光质感、大面积留白
   配色方案：象牙白 #F8F6F3 / 浅卡其 #D4C5B0 / 哑光黑 #1A1A1A / 深棕 #3D2817
   适配范围：4K大屏 / 电脑 / 平板 / 手机 全尺寸响应式
   ============================================================================ */

/* === CSS变量定义(全站统一色彩与间距) === */
:root {
    --color-ivory:     #F8F6F3;  /* 象牙白 - 主背景 */
    --color-khaki:     #D4C5B0;  /* 浅卡其 - 装饰色 */
    --color-khaki-light: #E8E0D5; /* 浅卡其浅色 - 卡片背景 */
    --color-matte-black: #1A1A1A; /* 哑光黑 - 主文字 */
    --color-deep-brown: #3D2817;  /* 深棕 - 标题/强调 */
    --color-brown:      #6B4E37;  /* 中棕 - 次要文字 */
    --color-gray:       #8C8579;  /* 灰棕 - 辅助文字 */
    --color-line:       #E5E0D8;  /* 分割线颜色 */
    --color-white:      #FFFFFF;  /* 纯白 */
    --color-whatsapp:   #25D366;  /* WhatsApp品牌绿 */
    --color-whatsapp-dark: #128C7E; /* WhatsApp深绿 */

    --font-serif: 'Playfair Display', 'Noto Serif SC', Georgia, serif;      /* 衬线字体(标题) */
    --font-sans:  'Montserrat', 'Noto Sans SC', -apple-system, sans-serif;  /* 无衬线(正文) */

    --shadow-soft: 0 2px 20px rgba(61, 40, 23, 0.06);    /* 柔和阴影 */
    --shadow-hover: 0 8px 40px rgba(61, 40, 23, 0.12);   /* hover阴影 */
    --shadow-nav: 0 2px 30px rgba(26, 26, 26, 0.08);     /* 导航阴影 */

    --transition: all 0.35s cubic-bezier(0.25, 0.1, 0.25, 1); /* 统一过渡 */

    --max-width: 1400px;  /* 内容最大宽度 */
    --nav-height: 80px;   /* 导航栏高度 */
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth; /* 平滑滚动 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-matte-black);
    background-color: var(--color-ivory);
    line-height: 1.7;
    overflow-x: hidden; /* 防止水平滚动条 */
}

/* === 链接样式 === */
a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

a:hover { color: var(--color-deep-brown); }

/* === 图片样式 === */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* === 标题样式(衬线字体) === */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 400; /* 奢侈品风格：不用粗体，用细体衬线 */
    color: var(--color-deep-brown);
    line-height: 1.3;
}

/* ============================================================================
   导航栏 - 奢侈品级别固定顶部导航
   ============================================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 60px;
    background: transparent;     /* 初始透明 */
    transition: var(--transition);
}

/* 滚动后导航栏样式 - 白底悬浮 */
.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-nav);
    backdrop-filter: blur(10px);
    height: 70px; /* 滚动后略缩小 */
}

/* 导航栏左侧Logo区域 */
.nav-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav-logo img {
    max-height: 42px;
    width: auto;
    object-fit: contain;
    transition: var(--transition);
}

.navbar.scrolled .nav-logo img { max-height: 36px; }

/* Logo文字(无图片时显示) */
.nav-logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    letter-spacing: 3px;
    color: var(--color-matte-black);
    font-weight: 500;
}
.navbar.scrolled .nav-logo-text { font-size: 1.3rem; }

/* 导航栏中部菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
    list-style: none;
}

/* 导航菜单项 */
.nav-item {
    position: relative;
}

.nav-link {
    font-size: 0.85rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--color-matte-black);
    padding: 10px 0;
    position: relative;
    cursor: pointer;
}

/* 导航项下划线hover效果(从中间展开) */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 0;
    height: 1px;
    background: var(--color-deep-brown);
    transition: var(--transition);
    transform: translateX(-50%);
}

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

/* 产品分类多级下拉菜单 */
.dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: var(--color-white);
    min-width: 220px;
    box-shadow: var(--shadow-hover);
    border-radius: 4px;
    padding: 12px 0;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* 下拉菜单项 */
.dropdown-item {
    display: block;
    padding: 10px 24px;
    font-size: 0.82rem;
    color: var(--color-matte-black);
    position: relative;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--color-ivory);
    color: var(--color-deep-brown);
    padding-left: 30px; /* hover时右移 */
}

/* 多级子菜单(二级下拉) */
.dropdown-sub {
    position: absolute;
    left: 100%;
    top: 0;
    background: var(--color-white);
    min-width: 200px;
    box-shadow: var(--shadow-hover);
    border-radius: 4px;
    padding: 12px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: var(--transition);
}

.dropdown-item.has-sub:hover .dropdown-sub {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* 子菜单箭头指示 */
.dropdown-item.has-sub::after {
    content: '›';
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: var(--color-gray);
}

/* 导航栏右侧WhatsApp按钮 */
.nav-whatsapp {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--color-whatsapp);
    color: var(--color-white) !important;
    padding: 10px 22px;
    border-radius: 30px;
    font-size: 0.82rem;
    letter-spacing: 1px;
    font-weight: 500;
    box-shadow: 0 2px 12px rgba(37, 211, 102, 0.3);
    transition: var(--transition);
    white-space: nowrap;
}

.nav-whatsapp:hover {
    background: var(--color-whatsapp-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
    color: var(--color-white) !important;
}

.nav-whatsapp svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* 移动端汉堡菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.nav-toggle span {
    width: 26px;
    height: 2px;
    background: var(--color-matte-black);
    transition: var(--transition);
    border-radius: 2px;
}

/* 汉堡菜单激活状态(变X) */
.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 全局悬浮WhatsApp按钮(移动端常驻) */
.floating-whatsapp {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    background: var(--color-whatsapp);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
    z-index: 999;
    transition: var(--transition);
    animation: pulse-whatsapp 2s infinite;
}

.floating-whatsapp:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 30px rgba(37, 211, 102, 0.5);
}

.floating-whatsapp svg {
    width: 30px;
    height: 30px;
    fill: var(--color-white);
}

/* WhatsApp按钮呼吸动画 */
@keyframes pulse-whatsapp {
    0%, 100% { box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4); }
    50% { box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4), 0 0 0 12px rgba(37, 211, 102, 0); }
}

/* ============================================================================
   通用容器与工具类
   ============================================================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 60px;
}

.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.5rem;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.section-title p {
    color: var(--color-gray);
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* 分割线装饰 */
.divider {
    width: 60px;
    height: 1px;
    background: var(--color-khaki);
    margin: 20px auto;
}

/* ============================================================================
   首页Hero区域
   ============================================================================ */
.hero {
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, #F8F6F3 0%, #E8E0D5 100%);
    position: relative;
    overflow: hidden;
}

/* Hero装饰背景纹理 */
.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 0L0 30M60 30L30 60' stroke='%23D4C5B0' stroke-width='0.5' opacity='0.15'/%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 4rem;
    letter-spacing: 4px;
    margin-bottom: 20px;
    color: var(--color-deep-brown);
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--color-brown);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 40px;
}

.hero-btn {
    display: inline-block;
    padding: 16px 48px;
    background: transparent;
    border: 1px solid var(--color-deep-brown);
    color: var(--color-deep-brown);
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: var(--transition);
    cursor: pointer;
}

.hero-btn:hover {
    background: var(--color-deep-brown);
    color: var(--color-white);
}

/* ============================================================================
   产品卡片网格
   ============================================================================ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 40px;
}

.product-card {
    background: var(--color-white);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

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

/* 产品卡片图片区域 */
.product-card-image {
    width: 100%;
    aspect-ratio: 4 / 5; /* 奢侈品常用纵向比例 */
    background: var(--color-khaki-light);
    overflow: hidden;
    position: relative;
}

.product-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-card:hover .product-card-image img {
    transform: scale(1.05); /* hover时图片轻微放大 */
}

/* 产品卡片信息区域 */
.product-card-info {
    padding: 24px;
    text-align: center;
}

.product-card-info h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--color-deep-brown);
}

.product-card-info .product-en {
    font-size: 0.78rem;
    color: var(--color-gray);
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.product-card-info .product-meta {
    font-size: 0.82rem;
    color: var(--color-brown);
    letter-spacing: 0.5px;
}

/* ============================================================================
   产品详情页样式
   ============================================================================ */
.product-detail {
    padding-top: var(--nav-height);
}

/* 产品详情主体布局(左图右信息) */
.product-detail-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    padding: 60px;
    max-width: var(--max-width);
    margin: 0 auto;
}

/* 左侧多媒体展示区 */
.gallery {
    position: sticky;
    top: 100px;
}

/* 大图展示区 */
.gallery-main {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--color-khaki-light);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    cursor: zoom-in;
}

.gallery-main img,
.gallery-main video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 大图放大按钮 */
.gallery-zoom-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
}

.gallery-main:hover .gallery-zoom-btn { opacity: 1; }

/* 缩略图列表 */
.gallery-thumbs {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.gallery-thumb {
    width: 80px;
    height: 80px;
    border-radius: 4px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    background: var(--color-khaki-light);
    position: relative;
}

.gallery-thumb.active {
    border-color: var(--color-deep-brown);
}

.gallery-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 视频缩略图标识 */
.gallery-thumb.video-thumb::after {
    content: '▶';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-white);
    font-size: 1.2rem;
    text-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

/* 右侧产品信息区 */
.product-info h1 {
    font-size: 2rem;
    margin-bottom: 8px;
}

.product-info .product-en-name {
    font-size: 0.9rem;
    color: var(--color-gray);
    letter-spacing: 1px;
    margin-bottom: 24px;
}

/* 产品基础信息表格 */
.product-info-table {
    width: 100%;
    margin-bottom: 30px;
    border-collapse: collapse;
}

.product-info-table th,
.product-info-table td {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-line);
    font-size: 0.9rem;
    text-align: left;
}

.product-info-table th {
    color: var(--color-gray);
    font-weight: 400;
    width: 120px;
    font-size: 0.82rem;
    letter-spacing: 1px;
}

.product-info-table td {
    color: var(--color-matte-black);
}

/* 询盘按钮组 */
.inquiry-actions {
    display: flex;
    gap: 16px;
    margin-top: 30px;
}

.btn-whatsapp {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px;
    background: var(--color-whatsapp);
    color: var(--color-white);
    border-radius: 4px;
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-whatsapp:hover {
    background: var(--color-whatsapp-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(37, 211, 102, 0.3);
    color: var(--color-white);
}

.btn-inquiry {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: transparent;
    border: 1px solid var(--color-deep-brown);
    color: var(--color-deep-brown);
    border-radius: 4px;
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: var(--transition);
    cursor: pointer;
}

.btn-inquiry:hover {
    background: var(--color-deep-brown);
    color: var(--color-white);
}

/* ============================================================================
   材质详情板块(核心顶配)
   ============================================================================ */
.material-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 60px;
    background: var(--color-white);
}

.material-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    letter-spacing: 2px;
}

/* 材质参数分组卡片 */
.material-group {
    margin-bottom: 50px;
}

.material-group-title {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    color: var(--color-deep-brown);
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-khaki);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.material-group-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 20px;
    background: var(--color-khaki);
}

/* 材质参数网格 */
.material-params {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.material-param {
    padding: 16px 20px;
    background: var(--color-ivory);
    border-radius: 4px;
    border-left: 3px solid var(--color-khaki);
}

.material-param-label {
    font-size: 0.78rem;
    color: var(--color-gray);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 6px;
}

.material-param-value {
    font-size: 0.92rem;
    color: var(--color-matte-black);
    line-height: 1.5;
}

/* ============================================================================
   定制服务板块
   ============================================================================ */
.custom-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 80px 60px;
}

.custom-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 24px;
}

.custom-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--color-white);
    border-radius: 4px;
    border: 1px solid var(--color-line);
    transition: var(--transition);
}

.custom-card:hover {
    border-color: var(--color-khaki);
    box-shadow: var(--shadow-soft);
    transform: translateY(-3px);
}

.custom-card-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-khaki-light);
    border-radius: 50%;
}

.custom-card-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--color-deep-brown);
}

.custom-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.custom-card p {
    font-size: 0.82rem;
    color: var(--color-gray);
}

/* ============================================================================
   询价表单
   ============================================================================ */
.inquiry-form-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 60px;
}

.inquiry-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.82rem;
    color: var(--color-gray);
    letter-spacing: 1px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 14px 16px;
    border: 1px solid var(--color-line);
    border-radius: 4px;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    background: var(--color-white);
    color: var(--color-matte-black);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-deep-brown);
    box-shadow: 0 0 0 3px rgba(61, 40, 23, 0.08);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    grid-column: 1 / -1;
    padding: 16px 48px;
    background: var(--color-deep-brown);
    color: var(--color-white);
    border: none;
    border-radius: 4px;
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    justify-self: center;
}

.form-submit:hover {
    background: var(--color-matte-black);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* 表单提交成功提示 */
.form-success {
    grid-column: 1 / -1;
    padding: 16px;
    background: #e8f5e9;
    border: 1px solid #a5d6a7;
    border-radius: 4px;
    color: #2e7d32;
    text-align: center;
    font-size: 0.9rem;
    display: none;
}

.form-success.show { display: block; }

/* ============================================================================
   页脚
   ============================================================================ */
.footer {
    background: var(--color-matte-black);
    color: var(--color-khaki-light);
    padding: 60px 60px 30px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    color: var(--color-khaki);
    font-size: 1.5rem;
    letter-spacing: 3px;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.88rem;
    line-height: 1.8;
    color: rgba(232, 224, 213, 0.6);
}

.footer-col h4 {
    color: var(--color-khaki);
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 20px;
    font-family: var(--font-sans);
    font-weight: 500;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 0.85rem;
    color: rgba(232, 224, 213, 0.6);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--color-khaki);
    padding-left: 5px;
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 30px;
    border-top: 1px solid rgba(232, 224, 213, 0.1);
    text-align: center;
    font-size: 0.8rem;
    color: rgba(232, 224, 213, 0.4);
    letter-spacing: 1px;
}

/* ============================================================================
   关于我们页面
   ============================================================================ */
.about-hero {
    padding-top: calc(var(--nav-height) + 80px);
    padding-bottom: 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--color-ivory) 0%, var(--color-khaki-light) 100%);
}

.about-hero h1 {
    font-size: 3rem;
    letter-spacing: 3px;
    margin-bottom: 16px;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px;
}

.about-content p {
    font-size: 1rem;
    line-height: 2;
    color: var(--color-brown);
    margin-bottom: 24px;
}

/* ============================================================================
   通用页面标题(产品列表、联系页等)
   ============================================================================ */
.page-header {
    padding-top: calc(var(--nav-height) + 60px);
    padding-bottom: 40px;
    text-align: center;
    background: var(--color-ivory);
}

.page-header h1 {
    font-size: 2.5rem;
    letter-spacing: 3px;
    margin-bottom: 12px;
}

.page-header p {
    color: var(--color-gray);
    font-size: 0.9rem;
    letter-spacing: 2px;
}

/* ============================================================================
   分页样式
   ============================================================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 60px;
}

.pagination a {
    min-width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-line);
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--color-matte-black);
    padding: 0 12px;
    transition: var(--transition);
}

.pagination a:hover,
.pagination a.active {
    background: var(--color-deep-brown);
    color: var(--color-white);
    border-color: var(--color-deep-brown);
}

/* ============================================================================
   图片放大弹窗(全屏预览)
   ============================================================================ */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 26, 26, 0.95);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
}

.lightbox.show { display: flex; }

.lightbox img {
    max-width: 90%;
    max-height: 90vh;
    object-fit: contain;
}

.lightbox-close {
    position: absolute;
    top: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: none;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    color: var(--color-white);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.lightbox-close:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--color-white);
}

/* 视频弹窗 */
.video-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 26, 26, 0.95);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.video-modal.show { display: flex; }

.video-modal video {
    max-width: 80%;
    max-height: 80vh;
}

/* ============================================================================
   Toast提示(轻量级消息通知)
   ============================================================================ */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-matte-black);
    color: var(--color-white);
    padding: 14px 32px;
    border-radius: 4px;
    font-size: 0.88rem;
    letter-spacing: 1px;
    z-index: 10000;
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============================================================================
   响应式适配 - 平板 (1024px以下)
   ============================================================================ */
@media (max-width: 1024px) {
    .navbar { padding: 0 30px; }
    .container { padding: 0 30px; }
    .product-detail-main { grid-template-columns: 1fr; padding: 30px; gap: 40px; }
    .gallery { position: static; }
    .material-section, .custom-section, .inquiry-form-section { padding: 60px 30px; }
    .footer { padding: 40px 30px 20px; }
    .footer-content { grid-template-columns: 1fr; gap: 30px; }
    .hero-content h1 { font-size: 3rem; }
}

/* ============================================================================
   响应式适配 - 手机 (768px以下)
   ============================================================================ */
@media (max-width: 768px) {
    :root {
        --nav-height: 64px;
    }

    /* 导航栏移动端适配 */
    .navbar { padding: 0 20px; }

    /* 隐藏PC端菜单，显示汉堡按钮 */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 360px;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 100px 30px 30px;
        gap: 0;
        box-shadow: -4px 0 30px rgba(0,0,0,0.1);
        transition: right 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
        overflow-y: auto;
    }

    .nav-menu.open { right: 0; }

    .nav-item {
        width: 100%;
        border-bottom: 1px solid var(--color-line);
    }

    .nav-link {
        display: block;
        padding: 16px 0;
        font-size: 0.95rem;
    }

    /* 移动端下拉菜单改为展开式 */
    .dropdown {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        min-width: 100%;
        padding: 0 0 0 20px;
        display: none;
    }

    .nav-item.expanded .dropdown { display: block; }

    .dropdown-sub {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        min-width: 100%;
        padding-left: 20px;
    }

    /* 移动端隐藏WhatsApp按钮(使用悬浮按钮替代) */
    .nav-whatsapp { display: none; }
    .nav-toggle { display: flex; }

    /* Hero区域缩小 */
    .hero { min-height: 500px; }
    .hero-content h1 { font-size: 2.2rem; letter-spacing: 2px; }
    .hero-content p { font-size: 0.9rem; }

    /* 产品网格单列 */
    .product-grid { grid-template-columns: 1fr; gap: 24px; }

    /* 询价表单单列 */
    .inquiry-form { grid-template-columns: 1fr; }

    /* 材质参数单列 */
    .material-params { grid-template-columns: 1fr; }

    /* 页面标题缩小 */
    .page-header h1 { font-size: 1.8rem; }
    .about-hero h1 { font-size: 2rem; }

    /* section间距缩小 */
    .section { padding: 60px 0; }
    .section-title h2 { font-size: 1.8rem; }

    /* 悬浮WhatsApp按钮位置调整 */
    .floating-whatsapp { bottom: 20px; right: 20px; width: 50px; height: 50px; }
    .floating-whatsapp svg { width: 26px; height: 26px; }
}

/* ============================================================================
   响应式适配 - 超大屏 (4K以上，1920px+)
   ============================================================================ */
@media (min-width: 1920px) {
    :root {
        --max-width: 1600px;
        --nav-height: 90px;
    }
    html { font-size: 18px; }
    .navbar { padding: 0 80px; }
    .container { padding: 0 80px; }
}