/* ============================================
   全局样式和设计系统
   ============================================ */

/* CSS变量 - 设计系统 */
:root {
    /* 主色调 */
    --primary-color: #667eea;
    --primary-dark: #764ba2;
    --primary-light: #8b9aff;
    --secondary-color: #ff6b6b;
    --secondary-dark: #ee5a6f;
    
    /* 中性色 */
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-tertiary: #6b6b6b;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f0f0f0;
    --border-color: #e0e0e0;
    
    /* 间距系统 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 5rem;
    
    /* 字体系统 */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 12px 30px rgba(0, 0, 0, 0.2);
    
    /* 过渡动画 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 确保body占满整个屏幕 */
html {
    height: 100%;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    height: 100%;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.7;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-size: var(--font-size-base);
}

/* 主体内容部分 */
main {
    flex: 1; /* 使得主内容区域自动占据剩余空间 */
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

@media (max-width: 1024px) {
    .container {
        max-width: 100%;
        padding: 0 var(--spacing-md);
    }
}

/* 顶部导航栏 */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

@media (max-width: 1024px) {
    nav {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
}

/* Logo 样式 */
.logo a {
    color: #fff;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 1px;
    position: relative;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: transform var(--transition-base);
}

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

.logo-img {
    height: 48px;
    width: auto;
    display: block;
    object-fit: contain;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    transition: transform var(--transition-base);
}

.logo a:hover .logo-img {
    transform: scale(1.05);
}

.logo-text {
    display: inline-block;
    vertical-align: middle;
    line-height: 1.2;
    font-size: var(--font-size-xl);
}

.logo a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #fff;
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s ease-out;
}

.logo a:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
}

/* 菜单样式 */
.menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.menu a {
    color: rgba(255, 255, 255, 0.95);
    font-size: var(--font-size-lg);
    text-decoration: none;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: all var(--transition-base);
    font-weight: 500;
    white-space: nowrap;
}

.menu a:hover {
    color: #fff;
    transform: translateY(-2px);
}

.menu a::before {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 2px;
    background: rgba(255, 255, 255, 0.9);
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform var(--transition-base);
    border-radius: var(--radius-sm);
}

.menu a:hover::before {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* ============================================
   响应式设计
   ============================================ */

/* 平板设备 (768px - 1024px) */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .advantages-grid,
    .services-grid,
    .products-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
}

/* 移动设备 (最大768px) */
@media (max-width: 768px) {
    nav {
        flex-direction: row;
        align-items: center;
        padding: var(--spacing-sm) var(--spacing-md);
        position: sticky;
        top: 0;
    }

    .logo a {
        font-size: var(--font-size-xl);
        gap: var(--spacing-xs);
    }
    
    .logo-img {
        height: 40px;
    }
    
    .logo-text {
        font-size: var(--font-size-lg);
    }

    .mobile-menu-toggle {
        display: flex;
        flex-direction: column;
        gap: 5px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: var(--spacing-xs);
        z-index: 1001;
    }

    .mobile-menu-toggle span {
        display: block;
        width: 25px;
        height: 3px;
        background: #fff;
        border-radius: 2px;
        transition: all var(--transition-base);
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
        flex-direction: column;
        gap: 0;
        width: 100%;
        padding: var(--spacing-md);
        border-top: 1px solid rgba(255, 255, 255, 0.2);
        box-shadow: var(--shadow-lg);
        z-index: 1000;
    }

    .menu.active {
        display: flex;
    }

    .menu a {
        font-size: var(--font-size-base);
        padding: var(--spacing-sm) 0;
        width: 100%;
        text-align: left;
    }

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

    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
        min-height: 60vh;
    }

    .hero h1 {
        font-size: clamp(var(--font-size-2xl), 6vw, var(--font-size-3xl));
        margin-bottom: var(--spacing-md);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-lg);
    }

    .hero-features {
        gap: var(--spacing-xs);
        margin-bottom: var(--spacing-lg);
    }

    .hero-features span {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }

    .hero-buttons .cta-button {
        width: 100%;
        max-width: 100%;
        min-width: auto;
    }

    .advantages,
    .services-preview,
    .cases-preview,
    .products {
        padding: var(--spacing-xl) 0;
    }

    .advantages h2,
    .services-preview h2,
    .cases-preview h2,
    .products h2 {
        font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-3xl));
        margin-bottom: var(--spacing-md);
    }

    .section-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-lg);
    }

    .advantages-grid,
    .services-grid,
    .cases-grid,
    .products-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .advantage-card,
    .service-card,
    .case-card,
    .product-card {
        padding: var(--spacing-lg);
    }
}

/* 小屏移动设备 (最大480px) */
@media (max-width: 480px) {
    nav {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .logo-img {
        height: 36px;
    }
    
    .logo-text {
        font-size: var(--font-size-base);
    }
    
    .hero {
        padding: var(--spacing-xl) var(--spacing-sm);
        min-height: 50vh;
    }
    
    .advantage-card,
    .service-card,
    .product-card {
        padding: var(--spacing-md);
    }
    
    .advantage-icon {
        font-size: 2.5rem;
    }
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #fff;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    position: relative;
    overflow: hidden;
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero h1 {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(var(--font-size-lg), 2vw, var(--font-size-xl));
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
    font-weight: 400;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.hero-features span {
    font-size: var(--font-size-base);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-base);
}

.hero-features span:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.cta-button {
    padding: var(--spacing-md) var(--spacing-xl);
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-lg);
    font-weight: 600;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 160px;
    box-shadow: var(--shadow-md);
}

.cta-button.primary {
    background-color: #fff;
    color: var(--primary-color);
}

.cta-button.primary:hover {
    background-color: #f8f9fa;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.cta-button.secondary {
    background-color: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
}

.cta-button.secondary:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* 服务优势 */
.advantages {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-primary);
}

.advantages h2 {
    text-align: center;
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
}

.section-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.advantage-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

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

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.advantage-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    display: inline-block;
    transition: transform var(--transition-base);
}

.advantage-card:hover .advantage-icon {
    transform: scale(1.1) rotate(5deg);
}

.advantage-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
}

.advantage-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: var(--font-size-base);
}

/* 服务预览 */
.services-preview {
    padding: 5rem 0;
    background-color: #f8f9fa;
}

.services-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 3rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.service-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border-top: 4px solid var(--primary-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.service-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.service-card ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.service-card ul li {
    padding: 0.5rem 0;
    color: #666;
    position: relative;
    padding-left: 1.5rem;
}

.service-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.service-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.service-link:hover {
    color: #764ba2;
}

.services-cta {
    text-align: center;
    margin-top: 3rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* 报价按钮特殊样式 */
.cta-button.pricing-btn {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    color: #fff;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    position: relative;
    overflow: hidden;
}

.cta-button.pricing-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.cta-button.pricing-btn:hover::before {
    left: 100%;
}

.cta-button.pricing-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    background: linear-gradient(135deg, #ff5252 0%, #e53935 100%);
}

.cta-button.pricing-btn .btn-icon {
    font-size: 1.3rem;
    line-height: 1;
}

.cta-button.pricing-btn .btn-text {
    font-size: 1.1rem;
    line-height: 1.2;
}

.cta-button.pricing-btn .btn-subtitle {
    font-size: 0.85rem;
    opacity: 0.9;
    font-weight: 500;
    padding-left: 0.5rem;
    border-left: 1px solid rgba(255, 255, 255, 0.3);
    margin-left: 0.3rem;
}

@media (max-width: 768px) {
    .services-cta {
        flex-direction: column;
        gap: 1rem;
    }
    
    .cta-button.pricing-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .cta-button.pricing-btn .btn-subtitle {
        display: block;
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.3);
        padding-left: 0;
        padding-top: 0.3rem;
        margin-left: 0;
        margin-top: 0.3rem;
        width: 100%;
        text-align: center;
    }
}

/* 案例预览 */
.cases-preview {
    padding: 5rem 0;
    background-color: #fff;
}

.cases-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.case-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.case-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-placeholder {
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
}

.case-card h3 {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 1.3rem;
    color: #333;
}

.case-card p {
    padding: 0 1.5rem 1.5rem;
    color: #666;
}

.cases-cta {
    text-align: center;
    margin-top: 3rem;
}

/* 产品模块 */
.products {
    padding: var(--spacing-3xl) 0;
    text-align: center;
    background-color: var(--bg-secondary);
}

.products h2 {
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.product-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    height: 100%;
}

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

.product-icon-wrapper {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px;
    padding: 15px;
    transition: all 0.3s ease;
}

.product-card:hover .product-icon-wrapper {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scale(1.05);
}

.product-icon {
    width: 70px;
    height: 70px;
    object-fit: contain;
    display: block;
}

.product-card h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 1rem;
    margin-top: 0;
}

.product-card p {
    font-size: 1rem;
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    flex-grow: 1;
}

.product-card .cta-button {
    padding: 0.8rem 1.6rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1rem;
    border: none;
    display: inline-block;
}

.product-card .cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* 通用样式补充 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

a {
    color: #667eea;
    transition: all 0.3s ease;
}

a:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

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

ul, ol {
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
}

/* 确保section有适当的间距 */
section {
    position: relative;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* SEO内容区域 */
.seo-content {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-primary);
}

.seo-content h2 {
    text-align: center;
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-4xl));
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
}

.seo-faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.seo-faq-item {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.seo-faq-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--primary-dark);
}

.seo-faq-item h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.4;
}

.seo-faq-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
    font-size: var(--font-size-base);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

@media (max-width: 768px) {
    .seo-content {
        padding: var(--spacing-xl) 0;
    }
    
    .seo-faq-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .seo-faq-item {
        padding: var(--spacing-lg);
    }
}

/* 页脚 */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    margin-top: auto;
}

footer a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

footer a:hover {
    color: #667eea;
    text-decoration: underline;
}

footer p {
    margin-bottom: 0.5rem;
}

footer img {
    vertical-align: middle;
    display: inline-block;
    height: auto;
}

footer a span {
    vertical-align: middle;
    line-height: 1;
}