/* ==============================
   统一的CSS设计系统 - Cheetah Power ATV
   ============================== */

/* 性能优化 */
img {
    image-rendering: auto;
}

/* 骨架屏样式 */
.skeleton {
    background: linear-gradient(90deg, rgba(255,255,255,0.05) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.05) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 关键资源预加载 */
@font-face {
    font-display: swap;
}

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

/* 根变量 - 设计系统核心 */
:root {
    /* 颜色系统 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a28;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    
    --accent-primary: #ffd700;
    --accent-secondary: #ffb700;
    --accent-gradient: linear-gradient(135deg, #ffd700 0%, #ffb700 50%, #e6a000 100%);
    --accent-glow: 0 0 20px rgba(255, 215, 0, 0.3);
    
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-tertiary: rgba(255, 255, 255, 0.6);
    --text-muted: rgba(255, 255, 255, 0.4);
    
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-hover: rgba(255, 215, 0, 0.4);
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
    --shadow-accent: 0 8px 30px rgba(255, 215, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(255, 215, 0, 0.15);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 容器 - 使用相对单位确保缩放稳定 */
.container {
    width: min(1200px, 92vw);
    margin: 0 auto;
    padding: 0 1rem;
}

/* 按钮系统 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    border: none;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255, 215, 0, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(255, 215, 0, 0.05);
}

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

.btn-dark:hover {
    background: #000;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-sm {
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
}

.btn-submit {
    width: 100%;
    padding: 1.1rem;
    font-size: 1.1rem;
    background: var(--accent-gradient);
    color: var(--bg-primary);
    font-weight: 700;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-accent);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 35px rgba(255, 215, 0, 0.35);
}

.btn-cart {
    flex: 1;
    background: rgba(255, 215, 0, 0.12);
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
}

.btn-cart:hover {
    background: var(--accent-gradient);
    color: var(--bg-primary);
}

.btn-view {
    flex: 1;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-view:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

/* ==============================
   现代化导航栏 - 参考Gooey设计理念
   ============================== */
.header {
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    color: var(--text-primary);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
    min-height: 80px;
}

/* Logo */
.logo {
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    font-weight: 800;
    color: var(--accent-primary);
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    letter-spacing: -0.02em;
    text-decoration: none;
    transition: var(--transition-base);
}

.logo:hover {
    transform: scale(1.02);
}

/* 导航链接 */
.nav {
    display: flex;
    gap: clamp(1rem, 3vw, 2.5rem);
    align-items: center;
    flex: 1;
    justify-content: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-base);
    padding: 0.5rem 0.75rem;
    position: relative;
    font-size: 0.95rem;
    border-radius: var(--radius-full);
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition-base);
    transform: translateX(-50%);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-primary);
    background: rgba(255, 215, 0, 0.08);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 80%;
}

/* 右侧操作区 */
.cart-wrapper {
    flex: 0 0 auto;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 1rem;
}

/* 语言切换 */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-option {
    padding: 0.45rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    color: var(--text-tertiary);
    font-size: 0.85rem;
    font-weight: 600;
}

.lang-option:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(255, 215, 0, 0.08);
}

.lang-option.active {
    border-color: var(--accent-primary);
    background: var(--accent-gradient);
    color: var(--bg-primary);
}

/* 购物车按钮 */
.cart-btn {
    position: relative;
    background: var(--accent-gradient);
    color: var(--bg-primary) !important;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    transition: var(--transition-base);
    box-shadow: var(--shadow-accent);
    white-space: nowrap;
}

.cart-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 35px rgba(255, 215, 0, 0.35);
}

.cart-count {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ff4757;
    color: #fff;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(255, 71, 87, 0.4);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

/* ==============================
   Section样式系统
   ============================== */
.section {
    padding: 4rem 0 6rem;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.8rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-desc {
    color: var(--text-tertiary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* ==============================
   页面头部
   ============================== */
.page-header {
    padding: clamp(140px, 20vh, 180px) 0 clamp(80px, 12vh, 100px);
    text-align: center;
    position: relative;
}

.page-header-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: center/cover no-repeat;
}

.page-header-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(10, 10, 15, 0.92) 0%, rgba(18, 18, 26, 0.85) 50%, rgba(26, 26, 40, 0.88) 100%);
}

.page-header-content {
    position: relative;
    z-index: 1;
}

.page-subtitle {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.page-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.page-desc {
    color: var(--text-secondary);
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
}

/* ==============================
   Hero区域
   ============================== */
.hero-section {
    position: relative;
    height: 100vh;
    min-height: 650px;
    max-height: 1000px;
    overflow: hidden;
    display: flex;
    align-items: center;
    margin-top: 0;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: center/cover no-repeat;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(10, 10, 15, 0.92) 0%, rgba(18, 18, 26, 0.85) 50%, rgba(26, 26, 40, 0.88) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--text-primary);
    max-width: 900px;
    margin: 0 auto;
    padding-top: 80px;
    width: 100%;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 215, 0, 0.12);
    border: 1px solid rgba(255, 215, 0, 0.3);
    padding: 0.55rem 1.6rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    color: var(--accent-primary);
    margin-bottom: 1.6rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 6vw, 4.2rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.05;
    background: linear-gradient(135deg, #ffffff 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.hero-content p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2.6rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-15px); }
    60% { transform: translateX(-50%) translateY(-7px); }
}

.scroll-indicator i {
    font-size: 2rem;
    color: var(--accent-primary);
}

/* ==============================
   特性卡片系统
   ============================== */
.features-section {
    background: linear-gradient(180deg, transparent 0%, rgba(26, 26, 40, 0.5) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-10px);
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-accent);
}

.feature-icon i {
    font-size: 2rem;
    color: var(--bg-primary);
}

.feature-card h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.feature-card p {
    color: var(--text-tertiary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ==============================
   产品卡片系统
   ============================== */
.products-section {
    background: linear-gradient(180deg, transparent 0%, rgba(22, 33, 62, 0.8) 100%);
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.category-tab {
    padding: 0.8rem 1.8rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition-base);
    font-weight: 600;
    white-space: nowrap;
}

.category-tab:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(255, 215, 0, 0.08);
}

.category-tab.active {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    border-color: transparent;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.product-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-base);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    background: var(--bg-card-hover);
}

.product-image {
    width: 100%;
    height: 240px;
    object-fit: cover;
    background: linear-gradient(135deg, #2d2d44 0%, #1a1a2e 100%);
}

.product-info {
    padding: 1.5rem;
}

.product-title {
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.product-price {
    font-size: 1.4rem;
    color: var(--accent-primary);
    font-weight: 800;
    margin-bottom: 1rem;
}

.product-actions {
    display: flex;
    gap: 0.7rem;
}

/* ==============================
   优势卡片系统
   ============================== */
.advantages-section {
    background: linear-gradient(180deg, rgba(22, 33, 62, 0.8) 0%, transparent 100%);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.advantage-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-base);
}

.advantage-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    background: var(--bg-card-hover);
}

.advantage-header {
    background: var(--accent-gradient);
    padding: 1.2rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.advantage-header i {
    font-size: 1.5rem;
    color: var(--bg-primary);
}

.advantage-header h3 {
    color: var(--bg-primary);
    font-size: 1.2rem;
    font-weight: 700;
}

.advantage-body {
    padding: 1.5rem;
}

.advantage-body ul {
    list-style: none;
}

.advantage-body li {
    padding: 0.6rem 0;
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
    color: var(--text-secondary);
}

.advantage-body li i {
    color: var(--accent-primary);
    margin-top: 0.2rem;
    flex-shrink: 0;
}

/* ==============================
   关于页面样式
   ============================== */
.about-section {
    background: linear-gradient(180deg, rgba(26, 26, 40, 0.5) 0%, transparent 100%);
}

.story-grid,
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 4rem;
    align-items: center;
}

.story-image img,
.about-image img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.about-image {
    position: relative;
}

.about-image-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: var(--accent-gradient);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-accent);
}

.about-image-badge h4 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--bg-primary);
}

.about-image-badge p {
    color: var(--bg-primary);
    font-weight: 600;
    font-size: 0.9rem;
}

.story-content h3,
.about-content h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.story-content p,
.about-content p {
    color: var(--text-tertiary);
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

/* 使命愿景 */
.mission-vision {
    background: linear-gradient(180deg, transparent 0%, rgba(26, 26, 40, 0.5) 100%);
}

.mv-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.mv-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: var(--transition-base);
}

.mv-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-lg);
}

.mv-icon {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-accent);
}

.mv-icon i {
    font-size: 2rem;
    color: var(--bg-primary);
}

.mv-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.mv-card p {
    color: var(--text-tertiary);
    line-height: 1.8;
}

/* 数据展示 */
.values-section {
    background: linear-gradient(180deg, rgba(26, 26, 40, 0.5) 0%, transparent 100%);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.value-card {
    text-align: center;
    padding: 2rem;
}

.value-number {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.value-title {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.value-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 时间线 */
.timeline-section {
    background: linear-gradient(180deg, transparent 0%, rgba(22, 33, 62, 0.8) 100%);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 100%;
    background: var(--accent-gradient);
}

.timeline-item {
    padding: 2rem 0;
    position: relative;
}

.timeline-content {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    width: calc(50% - 40px);
    position: relative;
    transition: var(--transition-base);
}

.timeline-content:hover {
    border-color: var(--accent-primary);
    background: var(--bg-card-hover);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: auto;
}

.timeline-dot {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 4px solid var(--bg-primary);
    z-index: 1;
}

.timeline-year {
    color: var(--accent-primary);
    font-weight: 800;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.timeline-title {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.timeline-desc {
    color: var(--text-tertiary);
    line-height: 1.7;
}

/* ==============================
   联系页面样式
   ============================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 4rem;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--accent-primary);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: var(--accent-gradient);
    color: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-accent);
}

.contact-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: var(--text-primary);
}

.contact-item p {
    color: var(--text-tertiary);
}

.contact-form {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    transition: var(--transition-base);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    transition: var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.08);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    height: 140px;
    resize: vertical;
}

.map-section {
    padding: 0 0 6rem;
}

.map-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 4rem;
    text-align: center;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.map-placeholder {
    color: var(--text-tertiary);
    font-size: 1.1rem;
}

.map-placeholder i {
    font-size: 4rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

/* ==============================
   CTA区域
   ============================== */
.cta-section {
    padding: 6rem 0;
    background: var(--accent-gradient);
    text-align: center;
}

.cta-content h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    color: var(--bg-primary);
    margin-bottom: 1rem;
    font-weight: 800;
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--bg-primary);
    opacity: 0.85;
    margin-bottom: 2rem;
}

/* ==============================
   页脚系统
   ============================== */
.footer {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 3rem 0 1.5rem;
    border-top: 1px solid var(--border-color);
    width: 100%;
}

.footer .container {
    width: min(1200px, 92vw);
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.footer-desc {
    color: var(--text-muted);
    line-height: 1.7;
}

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
    color: var(--text-primary);
}

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

.footer-col li {
    margin-bottom: 0.7rem;
}

.footer-col a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-base);
}

.footer-col a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition-base);
}

.social-links a:hover {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-accent);
}

/* ==============================
   响应式设计 - 确保各种缩放和设备下都正常
   ============================== */
@media (max-width: 1024px) {
    .header-content {
        padding: 1rem 0;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
        padding: 0.4rem 0.6rem;
    }
    
    .cart-wrapper {
        gap: 0.75rem;
    }
    
    .cart-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .lang-option {
        padding: 0.35rem 0.8rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 900px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .about-image-badge {
        position: relative;
        bottom: auto;
        right: auto;
        margin-top: 1.5rem;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-content {
        width: calc(100% - 60px);
        margin-left: 60px !important;
    }
    
    .timeline-dot {
        left: 20px;
    }
}

@media (max-width: 600px) {
    .container {
        width: 95vw;
        padding: 0 0.75rem;
    }
    
    .section {
        padding: 3rem 0 4rem;
    }
    
    .page-header {
        padding: 120px 0 60px;
    }
    
    .hero-content {
        padding-top: 60px;
    }
    
    .cart-wrapper {
        gap: 0.5rem;
    }
    
    .cart-btn span:last-child {
        display: none;
    }
    
    .cart-btn {
        padding: 0.6rem 1rem;
    }
    
    .lang-switcher {
        gap: 0.25rem;
    }
    
    .lang-option {
        padding: 0.3rem 0.6rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .contact-form,
    .mv-card,
    .map-container {
        padding: 1.5rem;
    }
}

/* 确保在大缩放下（如25%）的稳定性 */
@media (min-width: 2000px) {
    .container {
        max-width: 1400px;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --text-secondary: #ffffff;
        --text-tertiary: #ffffff;
        --text-muted: #e0e0e0;
        --border-color: rgba(255, 255, 255, 0.3);
    }
}

/* ==============================
   产品详情页特有样式
   ============================== */
.breadcrumb-section {
    padding: 120px 0 2rem 0;
    width: 100%;
}

.breadcrumb-section .container {
    width: min(1200px, 92vw);
    margin: 0 auto;
    padding: 0 1rem;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-base);
    font-size: 0.95rem;
}

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

.breadcrumb i {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.breadcrumb .current {
    color: var(--text-primary);
    font-weight: 500;
}

.product-section {
    padding: 2rem 0 5rem 0;
    width: 100%;
}

.product-section .container {
    width: min(1200px, 92vw);
    margin: 0 auto;
    padding: 0 1rem;
}

.product-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 5vw, 5rem);
    width: 100%;
}

.product-gallery {
    position: sticky;
    top: 120px;
}

.main-image-container {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: clamp(1.5rem, 4vw, 3rem);
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: clamp(350px, 50vw, 500px);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.main-image {
    max-width: 100%;
    max-height: clamp(350px, 50vw, 500px);
    object-fit: contain;
    border-radius: var(--radius-lg);
}

.thumbnail-container {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 0.5rem;
}

.thumbnail-container::-webkit-scrollbar {
    height: 6px;
}

.thumbnail-container::-webkit-scrollbar-track {
    background: var(--bg-card);
    border-radius: 3px;
}

.thumbnail-container::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 3px;
}

.thumbnail {
    width: clamp(70px, 10vw, 90px);
    height: clamp(70px, 10vw, 90px);
    object-fit: cover;
    border-radius: var(--radius-md);
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition-base);
    border: 2px solid transparent;
    flex-shrink: 0;
    background: var(--bg-card);
}

.thumbnail:hover,
.thumbnail.active {
    opacity: 1;
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

.product-info .product-badge {
    display: inline-block;
    background: rgba(255, 215, 0, 0.12);
    border: 1px solid rgba(255, 215, 0, 0.3);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.product-info h1 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    line-height: 1.2;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.product-price {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--accent-primary);
    font-weight: 800;
    margin-bottom: 2rem;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.product-price .currency {
    font-size: clamp(1rem, 2vw, 1.5rem);
    opacity: 0.8;
}

.product-description {
    margin-bottom: 2.5rem;
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

.product-description h1,
.product-description h2,
.product-description h3,
.product-description h4 {
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.product-description h1 { font-size: 1.5rem; }
.product-description h2 { font-size: 1.35rem; }
.product-description h3 { font-size: 1.2rem; }
.product-description h4 { font-size: 1.1rem; }

.product-description p {
    margin-bottom: 1rem;
}

.product-description ul,
.product-description ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.product-description li {
    margin-bottom: 0.5rem;
}

.specs-container {
    background: var(--bg-card);
    padding: clamp(1.5rem, 3vw, 2rem);
    border-radius: var(--radius-xl);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.specs-title {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 700;
}

.specs-title i {
    color: var(--accent-primary);
    font-size: 1.4rem;
}

.spec-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.spec-item {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-base);
}

.spec-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
}

.spec-label {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.spec-value {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.quantity-wrapper {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: var(--bg-card);
    padding: 0.6rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.qty-btn {
    width: 48px;
    height: 48px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.3rem;
    transition: var(--transition-base);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.qty-btn:hover {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    transform: scale(1.05);
}

.qty-input {
    width: 70px;
    height: 48px;
    text-align: center;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.2rem;
    background: transparent;
    color: var(--text-primary);
    font-weight: 700;
}

.qty-input:focus {
    outline: none;
}

.action-buttons .btn {
    flex: 1;
    min-width: 180px;
}

.related-section {
    padding: clamp(3rem, 6vw, 5rem) 0;
    background: linear-gradient(180deg, transparent 0%, rgba(22, 33, 62, 0.5) 100%);
    width: 100%;
}

.related-section .container {
    width: min(1200px, 92vw);
    margin: 0 auto;
    padding: 0 1rem;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.related-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition-base);
    text-decoration: none;
    display: block;
}

.related-card:hover {
    transform: translateY(-10px);
    background: var(--bg-card-hover);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
}

.related-card img {
    width: 100%;
    height: clamp(180px, 25vw, 220px);
    object-fit: contain;
    background: linear-gradient(135deg, #2d2d44 0%, #1a1a2e 100%);
    padding: 1.5rem;
}

.related-card-content {
    padding: 1.5rem;
}

.related-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
    line-height: 1.4;
    font-weight: 700;
}

.related-card-price {
    font-size: 1.3rem;
    color: var(--accent-primary);
    font-weight: 800;
}

.loading {
    text-align: center;
    padding: 5rem;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.debug-info {
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 12px;
    font-family: monospace;
    font-size: 0.85rem;
}

/* 产品详情页响应式 */
@media (max-width: 992px) {
    .product-wrapper {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .product-gallery {
        position: static;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
    
    .product-info .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .product-info .features-grid {
        grid-template-columns: 1fr;
    }
    
    .product-info h1 {
        font-size: 2rem;
    }
}

/* ==============================
   动画系统 - 丰富的视觉效果
   ============================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(255, 215, 0, 0.6);
    }
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s var(--transition-ease);
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s var(--transition-ease);
}

.animate-fade-in-down {
    animation: fadeInDown 0.6s var(--transition-ease);
}

.animate-fade-in-left {
    animation: fadeInLeft 0.6s var(--transition-ease);
}

.animate-fade-in-right {
    animation: fadeInRight 0.6s var(--transition-ease);
}

.animate-scale-in {
    animation: scaleIn 0.5s var(--transition-ease);
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-glow {
    animation: glow 2s ease-in-out infinite;
}

.animate-gradient {
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

/* 滚动时的淡入效果 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--transition-ease), transform 0.6s var(--transition-ease);
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 页面加载动画 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    transition: opacity 0.5s var(--transition-ease), visibility 0.5s var(--transition-ease);
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 215, 0, 0.2);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: rotate 1s linear infinite;
}

/* 按钮波纹效果 */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s var(--transition-ease), height 0.6s var(--transition-ease);
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

/* 卡片悬停时的光泽效果 */
.card,
.feature-card,
.product-card,
.related-card {
    position: relative;
    overflow: hidden;
}

.card::before,
.feature-card::before,
.product-card::before,
.related-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.05),
        transparent
    );
    transition: left 0.7s var(--transition-ease);
    z-index: 1;
    pointer-events: none;
}

.card:hover::before,
.feature-card:hover::before,
.product-card:hover::before,
.related-card:hover::before {
    left: 100%;
}

/* 图片悬停缩放效果 */
.product-image,
.related-card img {
    transition: transform 0.5s var(--transition-ease);
}

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

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}