/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 变量定义 */
:root {
    /* 颜色变量 */
    --primary-color: #165DFF;
    --primary-hover: #4080FF;
    --secondary-color: #36B37E;
    --secondary-hover: #52C41A;
    --danger-color: #FF5630;
    --warning-color: #FFAB00;
    --info-color: #00B8D9;
    
    /* 中性色 */
    --text-primary: #1D2129;
    --text-secondary: #4E5969;
    --text-tertiary: #86909C;
    --text-disabled: #C9CDD4;
    
    /* 背景色 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F7F8FA;
    --bg-tertiary: #F2F3F5;
    --bg-hover: #E8E9EB;
    
    /* 边框色 */
    --border-color: #E8E9EB;
    --border-hover: #D9D9D9;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.2);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础样式 */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

header:hover {
    box-shadow: var(--shadow-md);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    transition: var(--transition);
}

.logo a {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo a:hover span {
    color: var(--primary-color);
    transform: scale(1.05);
}

.logo span {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    transition: var(--transition);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--primary-color);
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

nav ul li a:hover::after, nav ul li a.active::after {
    width: 100%;
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-menu:hover {
    background-color: var(--bg-hover);
}

.mobile-menu span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
    border-radius: 1px;
}

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

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

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

/* 英雄区域样式 */
.hero {
    background: #1970fd;
    color: var(--bg-primary);
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.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 .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    margin-bottom: 48px;
}

.hero-screenshot {
    margin-top: 48px;
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-screenshot img {
    max-width: 100%;
    height: auto;
    max-height: 450px;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.hero-screenshot img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.hero-content h2 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 24px;
    opacity: 0.9;
}

.hero-content p {
    font-size: 16px;
    margin-bottom: 48px;
    opacity: 0.85;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

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

.btn:hover::before {
    width: 300px;
    height: 300px;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--bg-primary);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 16px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    min-width: 160px;
}

/* 部分通用样式 */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    line-height: 1.2;
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 64px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 核心优势样式 */
.features {
    background-color: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 48px;
    justify-items: center;
}

.feature-item {
    text-align: center;
    padding: 32px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 280px;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

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

.feature-item:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 48px;
    transition: var(--transition);
}

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

.feature-item h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    transition: var(--transition);
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* 产品特点样式 */
.product-features {
    background-color: var(--bg-secondary);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 48px;
    justify-items: center;
}

.product-item {
    text-align: center;
    padding: 32px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
    width: 100%;
    max-width: 300px;
}

.product-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.product-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.product-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* 用户评价样式 */
.user-reviews {
    background-color: var(--bg-secondary);
    padding: 80px 0;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 48px;
    justify-items: center;
}

.review-item {
    background-color: var(--bg-primary);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 300px;
}

.review-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.review-rating {
    margin-bottom: 16px;
    font-size: 20px;
}

.review-rating span {
    color: var(--warning-color);
}

.review-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}

.review-author {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.author-role {
    font-size: 12px;
    color: var(--text-tertiary);
}

/* 使用案例样式 */
.use-cases {
    background-color: var(--bg-primary);
    padding: 80px 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 48px;
    justify-items: center;
}

.case-item {
    background-color: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    text-align: center;
    width: 100%;
    max-width: 300px;
}

.case-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.case-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.case-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* 下载区域样式 */
.download-section {
    background-color: var(--bg-primary);
    text-align: center;
    padding: 80px 0;
}

.download-buttons {
    margin-top: 48px;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.download-buttons .btn {
    min-width: 200px;
}

/* 下载页面样式 */
.download-page {
    background-color: var(--bg-primary);
    padding-top: 120px;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.download-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.download-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 14px;
}

.download-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background-color: var(--primary-color);
    color: var(--bg-primary);
    padding: 14px 28px;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition);
    width: 100%;
    max-width: 300px;
    margin: 10px auto;
    border: 2px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

/* 主推下载链接样式 */
.download-link:first-child {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-size: 16px;
    font-weight: 600;
    padding: 16px 32px;
    box-shadow: var(--shadow-md);
    max-width: 320px;
}

.download-link:first-child::before {
    content: '推荐';
    position: absolute;
    top: -10px;
    right: 12px;
    background-color: #FFD700;
    color: var(--text-primary);
    font-size: 12px;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    transform: rotate(15deg);
}

.download-link:first-child:hover {
    background-color: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* 其他下载链接样式 */
.download-link:nth-child(2) {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
}

.download-link:nth-child(2):hover {
    background-color: #FF8C00;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-link:nth-child(3) {
    background-color: var(--info-color);
    border-color: var(--info-color);
}

.download-link:nth-child(3):hover {
    background-color: #00A3BF;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-tips {
    margin-top: 48px;
    background-color: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.download-tips h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.download-tips ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.download-tips li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 14px;
}

.download-tips li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* 功能介绍页面样式 */
.features-page {
    background-color: var(--bg-primary);
    padding-top: 120px;
}

.features-list {
    max-width: 800px;
    margin: 0 auto;
}

.feature-detail {
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
    padding: 32px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    gap: 24px;
    border: 1px solid var(--border-color);
}

.feature-detail:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-detail .feature-icon {
    margin-right: 0;
    margin-bottom: 0;
    flex-shrink: 0;
    font-size: 40px;
}

.feature-detail-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-detail-content p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* 工具列表页面样式 */
.tools-page {
    background-color: var(--bg-primary);
    padding-top: 120px;
}

/* 工具筛选样式 */
.tools-filter {
    background-color: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
    border: 1px solid var(--border-color);
}

.search-box {
    display: flex;
    margin-bottom: 20px;
    max-width: 400px;
}

.search-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    font-size: 14px;
    transition: var(--transition);
    background-color: var(--bg-primary);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
}

.search-btn {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border: none;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-tab {
    padding: 8px 16px;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.filter-tab:hover {
    background-color: var(--bg-hover);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.filter-tab.active {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-color: var(--primary-color);
}

/* 工具分类样式 */
.tools-category {
    margin-bottom: 60px;
    display: block;
}

.tools-category.hidden {
    display: none;
}

.tools-category h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
    position: relative;
}

.tools-category h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 80px;
    height: 2px;
    background-color: var(--primary-color);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.tool-item {
    padding: 24px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tool-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
    background-color: var(--bg-primary);
}

.tool-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.tool-detail {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: none;
}

.tool-item:hover .tool-detail {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.tool-detail p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 12px;
}

.tool-detail ul {
    margin-left: 20px;
    margin-bottom: 12px;
}

.tool-detail li {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 8px;
}

.tool-detail strong {
    color: var(--text-primary);
    font-weight: 600;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 关于我们页面样式 */
.about-page {
    background-color: var(--bg-primary);
    padding-top: 120px;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.about-content h3 {
    font-size: 24px;
    font-weight: 600;
    margin: 40px 0 20px;
    color: var(--text-primary);
}

/* 联系我们页面样式 */
.contact-page {
    background-color: var(--bg-primary);
    padding-top: 120px;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto 48px;
    background-color: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
}

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

.contact-info {
    margin-bottom: 48px;
}

.contact-info h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.contact-info-item {
    padding: 32px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.contact-info-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.contact-info-item h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.contact-info-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 8px;
}

.contact-info-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.contact-info-item a:hover {
    text-decoration: underline;
}

.faq {
    margin-top: 48px;
}

.faq h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.faq-item {
    padding: 24px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.faq-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.faq-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* 隐私政策和使用条款页面样式 */
.privacy-page, .terms-page {
    background-color: var(--bg-primary);
    padding-top: 120px;
}

.policy-content, .terms-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    padding: 48px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.policy-content h3, .terms-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 30px 0 15px;
    color: var(--text-primary);
}

.policy-content p, .terms-content p {
    margin-bottom: 15px;
    font-size: 14px;
}

.policy-content ul, .terms-content ul {
    margin-left: 24px;
    margin-bottom: 15px;
}

.policy-content li, .terms-content li {
    margin-bottom: 10px;
    font-size: 14px;
}

/* 页脚样式 */
footer {
    background: linear-gradient(135deg, #1D2129, #4E5969);
    color: var(--bg-primary);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}

.footer-logo img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    transition: var(--transition);
}

.footer-logo img:hover {
    transform: scale(1.1);
}

.footer-logo span {
    font-size: 20px;
    font-weight: bold;
    color: var(--bg-primary);
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin: 0;
}

.footer-links h4, .footer-contact h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--bg-primary);
    position: relative;
    padding-bottom: 8px;
}

.footer-links h4::after, .footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-links ul, .footer-contact ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links ul li, .footer-contact ul li {
    margin-bottom: 12px;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-links ul li a:hover {
    color: var(--primary-color);
    transform: translateX(4px);
}

.footer-contact ul li {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

.footer-bottom a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 8px;
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--bg-primary);
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 头部导航 */
    nav {
        position: fixed;
        top: 72px;
        left: -100%;
        width: 100%;
        background-color: var(--bg-primary);
        box-shadow: var(--shadow-md);
        transition: var(--transition);
        z-index: 999;
        padding: 24px 0;
    }

    nav.active {
        left: 0;
    }

    nav ul {
        flex-direction: column;
        padding: 0 20px;
        gap: 0;
    }

    nav ul li {
        margin: 0;
    }

    nav ul li a {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }

    nav ul li a:last-child {
        border-bottom: none;
    }

    .mobile-menu {
        display: flex;
    }

    /* 英雄区域 */
    .hero {
        padding: 100px 0 60px;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .hero-content h2 {
        font-size: 20px;
    }

    .hero-content p {
        font-size: 14px;
    }

    /* 按钮 */
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .btn-secondary {
        margin-left: 0;
        margin-top: 15px;
    }

    /* 部分标题 */
    .section-title {
        font-size: 28px;
    }

    /* 特性卡片 */
    .features-grid, .product-grid, .download-options {
        grid-template-columns: 1fr;
    }

    /* 功能介绍 */
    .feature-detail {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    /* 联系表单 */
    .contact-form {
        padding: 24px;
    }

    /* 隐私政策和使用条款 */
    .policy-content, .terms-content {
        padding: 24px;
    }

    /* 页脚 */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-logo {
        align-items: center;
    }

    .footer-links, .footer-contact {
        text-align: center;
    }

    .footer-links h4, .footer-contact h4 {
        text-align: center;
    }

    .footer-links h4::after, .footer-contact h4::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

@media (max-width: 480px) {
    /* 英雄区域 */
    .hero-content h1 {
        font-size: 28px;
    }

    /* 按钮 */
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .btn-large {
        padding: 12px 24px;
        font-size: 16px;
    }

    /* 部分标题 */
    .section-title {
        font-size: 24px;
    }

    /* 特性卡片 */
    .feature-item, .product-item, .download-card, .contact-info-item, .faq-item {
        padding: 24px 16px;
    }

    /* 页脚 */
    footer {
        padding: 40px 0 20px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-item, .product-item, .download-card, .feature-detail, .tool-item, .contact-info-item, .faq-item {
    animation: fadeInUp 0.6s ease-out;
}

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

/* 选择文本样式 */
::selection {
    background-color: rgba(22, 93, 255, 0.2);
    color: var(--primary-color);
}

::-moz-selection {
    background-color: rgba(22, 93, 255, 0.2);
    color: var(--primary-color);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(22, 93, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* 工具提示 */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    bottom: 110%;
}