/* ========================================
   华仪电子科技 - 企业网站样式
   Responsive Enterprise Website
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #0066CC;
    --color-primary-dark: #004499;
    --color-secondary: #00A86B;
    --color-secondary-dark: #007A4D;
    --color-accent: #FF6B35;
    --color-accent-hover: #E55A2B;
    
    --color-bg: #F8FAFC;
    --color-bg-dark: #1A1A2E;
    --color-bg-card: #FFFFFF;
    --color-bg-light: #F0F4F8;
    
    --color-text: #333333;
    --color-text-secondary: #666666;
    --color-text-light: #999999;
    --color-text-inverse: #FFFFFF;
    
    --color-border: #E5E7EB;
    --color-border-light: #F0F0F0;
    
    /* Typography */
    --font-family: 'Noto Sans SC', 'Noto Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;
    --font-size-3xl: 36px;
    --font-size-4xl: 48px;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    --spacing-2xl: 80px;
    
    /* Layout */
    --container-width: 1400px;
    --header-height: 80px;
    --header-height-mobile: 70px;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.15);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    --transition: 0.3s ease;
    --transition-fast: 0.15s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

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

ul {
    list-style: none;
}

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

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

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.header.scrolled {
    background: var(--color-bg-dark);
}

.header.scrolled .logo-text,
.header.scrolled .nav-link {
    color: var(--color-text-inverse);
}

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

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-text-inverse);
    border-radius: var(--radius-md);
    font-size: 20px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-cn {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.header.scrolled .logo-cn {
    color: var(--color-text-inverse);
}

.logo-en {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: 1.2;
}

.header.scrolled .logo-en {
    color: rgba(255, 255, 255, 0.7);
}

/* Navigation */
.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    position: relative;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-xs) 0;
    transition: var(--transition);
}

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

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

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

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

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: var(--transition);
}

.lang-switch:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.lang-switch .lang-current {
    font-weight: 500;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-xs);
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-slider {
    height: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-slide .container {
    display: flex;
    align-items: center;
    min-height: calc(100vh - var(--header-height));
}

.hero-content {
    max-width: 700px;
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

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

/* Hero Navigation */
.hero-nav {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 10;
}

.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.4);
    transition: var(--transition);
}

.hero-dot.active {
    background: var(--color-text-inverse);
    transform: scale(1.2);
}

.hero-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    color: var(--color-text-inverse);
    font-size: 18px;
    transition: var(--transition);
    z-index: 10;
}

.hero-arrow:hover {
    background: rgba(255, 255, 255, 0.3);
}

.hero-prev {
    left: var(--spacing-md);
}

.hero-next {
    right: var(--spacing-md);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 14px 32px;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    white-space: nowrap;
}

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

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-text-inverse);
    color: var(--color-text-inverse);
}

.btn-outline:hover {
    background: var(--color-text-inverse);
    color: var(--color-primary);
}

.btn-outline-primary {
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline-primary:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-light {
    background: var(--color-text-inverse);
    color: var(--color-primary);
}

.btn-light:hover {
    background: var(--color-bg-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   Sections
   ======================================== */
.section {
    padding: var(--spacing-2xl) 0;
}

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

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
}

.section-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ========================================
   Features
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.feature-card {
    background: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-lg);
    color: var(--color-text-inverse);
    font-size: 28px;
}

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.feature-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   Products
   ======================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

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

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

.product-image {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    color: var(--color-primary);
    font-size: 60px;
}

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

.product-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.product-model {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.product-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ========================================
   News
   ======================================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.news-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.news-image {
    position: relative;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-text-inverse);
    font-size: 50px;
}

.news-category {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-inverse);
    font-weight: 500;
}

.news-content {
    padding: var(--spacing-md);
}

.news-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.news-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.news-link i {
    transition: var(--transition);
}

.news-link:hover i {
    transform: translateX(4px);
}

/* ========================================
   Stats
   ======================================== */
.stats {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    padding: var(--spacing-xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    text-align: center;
}

.stat-item {
    padding: var(--spacing-md);
}

.stat-number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.85);
}

/* ========================================
   CTA
   ======================================== */
.cta {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
    text-align: center;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-bg-dark);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    color: rgba(255, 255, 255, 0.8);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 18px;
}

.footer-logo .logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-inverse);
}

.footer-desc {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.6);
}

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

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-text-inverse);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--color-primary);
}

.footer-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--color-primary);
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-primary);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.footer-contact i {
    color: var(--color-primary);
    margin-top: 4px;
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.6);
}

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

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-bottom-links a:hover {
    color: var(--color-primary);
}

/* ========================================
   Responsive - Tablet
   ======================================== */
@media (max-width: 1199px) {
    :root {
        --font-size-3xl: 32px;
        --font-size-4xl: 40px;
    }
    
    .features-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========================================
   Responsive - Mobile
   ======================================== */
@media (max-width: 767px) {
    :root {
        --header-height: var(--header-height-mobile);
        --spacing-2xl: 50px;
        --spacing-xl: 40px;
        --font-size-3xl: 28px;
        --font-size-4xl: 32px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    /* Header */
    .header-inner {
        position: relative;
    }
    
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-bg-card);
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .header.scrolled .nav {
        background: var(--color-bg-dark);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-sm);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-link::after {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    /* Hero */
    .hero {
        min-height: auto;
    }
    
    .hero-slide .container {
        min-height: calc(100vh - var(--header-height) - 60px);
        padding: var(--spacing-xl) 0;
    }
    
    .hero-content {
        padding: var(--spacing-md);
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-arrow {
        display: none;
    }
    
    /* Sections */
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-lg);
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    /* Products */
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    /* News */
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    /* Stats */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

/* ========================================
   Page: About
   ======================================== */
.page-hero {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    padding: calc(var(--header-height) + var(--spacing-xl)) 0 var(--spacing-xl);
    text-align: center;
}

.page-hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-sm);
}

.page-hero-subtitle {
    font-size: var(--font-size-base);
    color: rgba(255, 255, 255, 0.8);
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
}

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

/* About Content */
.about-content {
    padding: var(--spacing-xl) 0;
}

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

.about-text h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.about-text p {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.about-image {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-xl);
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-inverse);
    font-size: 100px;
}

/* Timeline */
.timeline {
    padding: var(--spacing-lg) 0;
}

.timeline-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.timeline-year {
    flex-shrink: 0;
    width: 100px;
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
}

.timeline-content h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Values */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.value-card {
    background: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.value-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    color: var(--color-primary);
    font-size: 24px;
}

.value-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.value-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* ========================================
   Page: Products
   ======================================== */
.products-page {
    padding: var(--spacing-xl) 0;
}

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

.filter-btn {
    padding: 10px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.products-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.product-detail-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.product-detail-image {
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    color: var(--color-primary);
    font-size: 70px;
}

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

.product-detail-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.product-detail-model {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.product-detail-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.product-detail-btn {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 500;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xl);
}

.page-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: var(--transition);
}

.page-btn:hover,
.page-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
}

/* ========================================
   Page: News
   ======================================== */
.news-page {
    padding: var(--spacing-xl) 0;
}

.news-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.news-list-card {
    display: flex;
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.news-list-image {
    flex-shrink: 0;
    width: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-text-inverse);
    font-size: 40px;
}

.news-list-content {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.news-list-category {
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.news-list-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.news-list-excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-list-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
}

/* ========================================
   Page: Contact
   ======================================== */
.contact-content {
    padding: var(--spacing-xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
}

.contact-info {
    background: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-info-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.contact-info-item {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.contact-info-icon {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-light);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-size: 18px;
    flex-shrink: 0;
}

.contact-info-text h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 2px;
}

.contact-info-text p,
.contact-info-text a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.contact-info-text a:hover {
    color: var(--color-primary);
}

.contact-map {
    margin-top: var(--spacing-lg);
    height: 250px;
    background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--color-bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-form-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

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

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-submit {
    width: 100%;
    padding: 14px;
    background: var(--color-accent);
    color: var(--color-text-inverse);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.form-submit:hover {
    background: var(--color-accent-hover);
}

/* ========================================
   Responsive - Products & News
   ======================================== */
@media (max-width: 991px) {
    .products-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-list {
        grid-template-columns: 1fr;
    }
    
    .news-list-card {
        flex-direction: column;
    }
    
    .news-list-image {
        width: 100%;
        height: 180px;
    }
    
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {
    .products-list {
        grid-template-columns: 1fr;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: var(--font-size-xs);
    }
}

/* ========================================
   Language - English
   ======================================== */
html[lang="en"] .logo-en {
    display: block;
}

html[lang="zh-CN"] .logo-en {
    display: none;
}

html[lang="en"] .logo-cn {
    display: none;
}

html[lang="zh-CN"] .logo-cn {
    display: block;
}

/* ========================================
   Global Search
   ======================================== */
.header-search {
    position: relative;
    margin-left: 20px;
}

.search-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    width: 200px;
    padding: 8px 36px 8px 14px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    transition: all 0.3s ease;
    background: var(--color-bg-light);
}

.search-input:focus {
    width: 260px;
    border-color: var(--color-primary);
    outline: none;
    background: var(--color-bg-card);
}

.search-btn {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover {
    color: var(--color-primary);
}

/* 搜索下拉结果 */
.search-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    min-width: 320px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-height: 420px;
    overflow-y: auto;
    z-index: 1100;
    display: none;
}

.search-dropdown.active {
    display: block;
}

.search-empty {
    padding: 30px 20px;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.search-loading {
    padding: 20px;
    text-align: center;
    color: var(--color-text-secondary);
}

.search-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: background 0.2s;
    text-decoration: none;
}

.search-item:hover {
    background: var(--color-bg-light);
}

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

.search-item-img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    flex-shrink: 0;
    overflow: hidden;
}

.search-item-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.search-item-img i {
    font-size: 20px;
    color: var(--color-primary);
}

.search-item-info {
    flex: 1;
    min-width: 0;
}

.search-item-info h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-item-info h4 mark {
    background: #fff3cd;
    color: inherit;
    padding: 0 2px;
    border-radius: 2px;
}

.search-item-info p {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-more {
    display: block;
    padding: 12px;
    text-align: center;
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-top: 1px solid var(--color-border);
    transition: background 0.2s;
}

.search-more:hover {
    background: var(--color-bg-light);
    color: var(--color-primary);
}

/* 移动端隐藏搜索框 */
@media (max-width: 991px) {
    .header-search {
        display: none;
    }
}

/* ========================================
   Page: FAQ
   ======================================== */
.faq-content {
    padding: var(--spacing-xl) 0;
}

/* FAQ 分类标签 */
.faq-categories {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.faq-category-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    transition: all 0.3s ease;
    cursor: pointer;
}

.faq-category-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.faq-category-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
}

.faq-category-btn i {
    font-size: 16px;
}

/* FAQ 列表 */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-item.hidden {
    display: none;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text);
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--color-bg-light);
}

.faq-question span {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    padding-right: var(--spacing-md);
}

.faq-question span i {
    color: var(--color-primary);
    font-size: 18px;
    flex-shrink: 0;
}

.faq-icon {
    flex-shrink: 0;
    transition: transform 0.3s ease;
    color: var(--color-text-secondary);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-inner {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    border-top: 1px solid var(--color-border-light);
}

.faq-answer-inner p {
    font-size: var(--font-size-base);
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
}

.faq-answer-inner p:first-child {
    margin-top: var(--spacing-md);
}

.faq-answer-inner ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
}

.faq-answer-inner li {
    font-size: var(--font-size-sm);
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    list-style: disc;
}

.faq-answer-inner strong {
    color: var(--color-text);
    font-weight: 600;
}

/* FAQ 联系区 */
.faq-contact {
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-bg-light), #e8f4fc);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.faq-contact-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
    color: var(--color-text-inverse);
    font-size: 32px;
}

.faq-contact h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.faq-contact p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

/* FAQ 响应式 */
@media (max-width: 767px) {
    .faq-categories {
        gap: var(--spacing-xs);
    }
    
    .faq-category-btn {
        padding: 10px 16px;
        font-size: var(--font-size-xs);
    }
    
    .faq-category-btn span {
        display: none;
    }
    
    .faq-category-btn i {
        margin: 0;
    }
    
    .faq-question {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .faq-question span i {
        display: none;
    }
    
    .faq-answer-inner {
        padding: 0 var(--spacing-md) var(--spacing-sm);
    }
    
    .faq-answer-inner p,
    .faq-answer-inner li {
        font-size: var(--font-size-sm);
    }
    
    .faq-contact {
        padding: var(--spacing-lg);
    }
    
    .faq-contact-icon {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }
    
    .faq-contact h3 {
        font-size: var(--font-size-lg);
    }
}