/* =================================
   CSS变量 - 主题色彩管理
   ================================= */
:root {
    /* 主色调 - Iwara 青绿色系 */
    --primary-color: #4db8a6;
    --primary-dark: #3a9d8d;
    --primary-light: #6ec9b8;
    
    /* 辅助色 */
    --secondary-color: #5cb85c;
    --accent-color: #5dade2;
    
    /* 背景色 - 浅色系 */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8e8e8;
    --bg-card: #ffffff;
    --bg-hover: #e0f2f1;
    
    /* 文字颜色 */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #4db8a6 0%, #3a9d8d 100%);
    --gradient-secondary: linear-gradient(135deg, #5cb85c 0%, #4caf50 100%);
    --gradient-accent: linear-gradient(135deg, #5dade2 0%, #3498db 100%);
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.15);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
}

/* =================================
   全局样式重置
   ================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: 'Noto Sans SC', 'Poppins', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* =================================
   导航栏
   ================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid rgba(77, 184, 166, 0.15);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a:not(.nav-btn) {
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-menu a:not(.nav-btn)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-normal);
}

.nav-menu a:not(.nav-btn):hover::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: white !important;
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn-text-short {
    display: none;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-btn i {
    font-size: 1rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: var(--radius-sm);
    transition: var(--transition-normal);
}

/* =================================
   英雄区域
   ================================= */
.hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 0 60px;
    background: var(--bg-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(77, 184, 166, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(92, 184, 92, 0.08) 0%, transparent 50%);
    animation: pulseGlow 10s ease-in-out infinite;
}

@keyframes pulseGlow {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.hero-overlay {
    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(77,184,166,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.title-line {
    font-size: 3.5rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeInUp 0.8s ease;
}

.title-subtitle {
    font-size: 1.8rem;
    font-weight: 300;
    color: var(--text-secondary);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

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

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(77, 184, 166, 0.3);
}

.btn-secondary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--text-primary);
    transform: translateY(-3px);
}

.btn-large {
    padding: 18px 48px;
    font-size: 1.1rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.8s backwards;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.stat-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* =================================
   通用Section样式
   ================================= */
section {
    padding: var(--spacing-xl) 0;
    position: relative;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* =================================
   平台特色
   ================================= */
.features {
    background: var(--bg-secondary);
}

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

.feature-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 1px solid rgba(77, 184, 166, 0.1);
}

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

.feature-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

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

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.feature-list i {
    color: var(--accent-color);
}

/* =================================
   核心功能
   ================================= */
.core-functions {
    background: var(--bg-primary);
}

.functions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.function-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.function-item:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.function-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.function-icon i {
    font-size: 2.5rem;
    color: var(--text-primary);
}

.function-item h4 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.function-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =================================
   内容分类
   ================================= */
.categories {
    background: var(--bg-secondary);
}

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

.category-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid rgba(77, 184, 166, 0.1);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-8px);
    border-color: var(--secondary-color);
    box-shadow: 0 8px 24px rgba(77, 184, 166, 0.2);
}

.category-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon i {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.category-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
}

.category-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* =================================
   精选视频
   ================================= */
.videos {
    background: var(--bg-primary);
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

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

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

.video-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 比例 */
    background: var(--bg-tertiary);
    overflow: hidden;
}

.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #4db8a6 0%, #3a9d8d 100%);
}

.video-placeholder i {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.5);
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.video-card:hover .video-overlay {
    opacity: 1;
}

.play-btn {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    transition: var(--transition-normal);
}

.video-card:hover .play-btn {
    transform: scale(1);
}

.play-btn i {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-left: 4px;
}

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

.video-info h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.video-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.more-videos {
    text-align: center;
}

/* =================================
   用户评价
   ================================= */
.testimonials {
    background: var(--bg-secondary);
}

/* =================================
   文章资讯
   ================================= */
.articles {
    background: var(--bg-primary);
}

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

.article-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(77, 184, 166, 0.1);
}

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

.article-image {
    position: relative;
    display: block;
    width: 100%;
    padding-top: 56.25%;
    background: var(--bg-tertiary);
    overflow: hidden;
}

.article-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #4db8a6 0%, #3a9d8d 100%);
}

.article-thumbnail i {
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.7);
}

.article-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--secondary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
}

.article-content {
    padding: var(--spacing-lg);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-content h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-content h3 a {
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.article-content h3 a:hover {
    color: var(--primary-color);
}

.article-content > p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition-normal);
}

.read-more:hover {
    gap: 12px;
}

.read-more i {
    font-size: 0.9rem;
}

/* 文章内页样式 */
.article-header {
    padding: 120px 0 60px;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.article-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(77, 184, 166, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(92, 184, 92, 0.08) 0%, transparent 50%);
}

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

.article-category {
    display: inline-block;
    padding: 6px 16px;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.article-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.article-info {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    color: var(--text-secondary);
}

.article-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.article-info-item i {
    color: var(--primary-color);
}

.article-body {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.article-body-content {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.article-body-content h2 {
    font-size: 2rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.article-body-content h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.article-body-content h4 {
    font-size: 1.2rem;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.article-body-content p {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.article-body-content ul,
.article-body-content ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.article-body-content li {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.article-body-content blockquote {
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-md) 0;
    background: var(--bg-primary);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-md);
}

.article-body-content blockquote p {
    margin-bottom: 0;
    font-style: italic;
}

.article-body-content img {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
}

.article-body-content code {
    background: var(--bg-primary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.article-body-content pre {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
}

.article-body-content pre code {
    background: none;
    padding: 0;
}

.article-tags {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(77, 184, 166, 0.2);
}

.article-tags h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.tag-list {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.tag:hover {
    background: var(--primary-color);
    color: white;
}

.article-share {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(77, 184, 166, 0.2);
}

.article-share h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.share-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.share-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.share-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.related-articles {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
}

.related-articles .articles-grid {
    grid-template-columns: repeat(3, 1fr);
}

/* =================================
   用户评价
   ================================= */
.testimonials {
    background: var(--bg-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.testimonial-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(77, 184, 166, 0.1);
    transition: all var(--transition-normal);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-avatar i {
    font-size: 2rem;
    color: var(--text-primary);
}

.author-info h5 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.author-info span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* =================================
   常见问题
   ================================= */
.faq {
    background: var(--bg-primary);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(77, 184, 166, 0.1);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.faq-question i:first-child {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.faq-question h4 {
    flex: 1;
    font-size: 1.1rem;
}

.faq-toggle {
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg) calc(var(--spacing-lg) + 1.5rem + var(--spacing-md));
    color: var(--text-secondary);
    line-height: 1.8;
}

/* =================================
   CTA区域
   ================================= */
.cta {
    background: var(--bg-secondary);
    padding: var(--spacing-xl) 0;
}

.cta-content {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.cta-content .btn {
    background: var(--text-primary);
    color: var(--primary-dark);
    font-weight: 700;
}

.cta-content .btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 12px 24px rgba(255, 255, 255, 0.4);
}

/* =================================
   页脚
   ================================= */
.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(77, 184, 166, 0.15);
}

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

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.footer-logo i {
    font-size: 2rem;
}

.footer-desc {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.footer-social a:hover {
    background: var(--gradient-primary);
    transform: translateY(-3px);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(77, 184, 166, 0.1);
}

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

.footer-tags {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: center;
    flex-wrap: wrap;
}

.footer-tags span {
    padding: 4px 12px;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* =================================
   返回顶部按钮
   ================================= */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(77, 184, 166, 0.3);
}

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

/* 平板设备 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        justify-content: flex-start;
        padding: var(--spacing-xl) 0;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-right {
        gap: var(--spacing-sm);
    }
    
    .nav-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .btn-text {
        display: none;
    }
    
    .btn-text-short {
        display: inline;
    }
    
    .title-line {
        font-size: 2.2rem;
    }
    
    .title-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-description {
        font-size: 1rem;
        margin-bottom: var(--spacing-md);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        margin-bottom: var(--spacing-md);
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .hero-stats {
        flex-direction: row;
        gap: var(--spacing-xs);
        width: 100%;
    }
    
    .stat-item {
        flex: 1;
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
        min-width: 0;
    }
    
    .stat-info {
        width: 100%;
    }
    
    .stat-item i {
        font-size: 1.5rem;
    }
    
    .stat-number {
        font-size: 1.2rem;
        font-weight: 700;
        display: block;
        white-space: nowrap;
    }
    
    .stat-label {
        font-size: 0.75rem;
        display: block;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid,
    .categories-grid,
    .videos-grid {
        grid-template-columns: 1fr;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .functions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .related-articles .articles-grid {
        grid-template-columns: 1fr;
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    .title-line {
        font-size: 1.8rem;
    }
    
    .title-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-description {
        font-size: 0.9rem;
    }
    
    .stat-item {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-xs) 0.25rem;
        min-width: 0;
    }
    
    .stat-info {
        width: 100%;
    }
    
    .stat-item i {
        font-size: 1.2rem;
    }
    
    .stat-number {
        font-size: 0.95rem;
        font-weight: 700;
        display: block;
        white-space: nowrap;
    }
    
    .stat-label {
        font-size: 0.65rem;
        white-space: nowrap;
        display: block;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .functions-grid {
        grid-template-columns: 1fr;
    }
    
    .videos-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-content h2 {
        font-size: 1.8rem;
    }
    
    .cta-content p {
        font-size: 1rem;
    }
}

/* =================================
   动画优化
   ================================= */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* =================================
   子页面样式
   ================================= */

/* 页面标题区 */
.page-header {
    padding: 120px 0 60px;
    background: var(--bg-primary);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(77, 184, 166, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(92, 184, 92, 0.08) 0%, transparent 50%);
}

.page-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.page-title i {
    color: var(--primary-color);
}

.page-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

/* 页面内容区 */
.page-content {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

/* FAQ分类 */
.faq-category {
    margin-bottom: var(--spacing-xl);
}

.category-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
}

.category-title i {
    color: var(--primary-color);
}

/* 快速链接 */
.quick-links {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.quick-links h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.quick-link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    text-align: center;
    border: 2px solid transparent;
}

.quick-link-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.quick-link-card i {
    font-size: 2rem;
    color: var(--primary-color);
}

.quick-link-card span {
    font-weight: 500;
    color: var(--text-primary);
}

/* 导航激活状态 */
.nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    width: 100%;
}

/* 内容块 */
.content-block {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.content-block h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.content-block p {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.content-block ul, .content-block ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.content-block li {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* 表单样式 */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid rgba(77, 184, 166, 0.2);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(77, 184, 166, 0.1);
}

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

.form-submit {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* 信息提示框 */
.info-box {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
}

.info-box.info {
    background: rgba(77, 184, 166, 0.1);
    border-color: var(--primary-color);
}

.info-box.warning {
    background: rgba(255, 193, 7, 0.1);
    border-color: #ffc107;
}

.info-box.success {
    background: rgba(92, 184, 92, 0.1);
    border-color: var(--secondary-color);
}

.info-box p {
    margin: 0;
    color: var(--text-primary);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .category-title {
        font-size: 1.5rem;
    }
    
    .links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 1.6rem;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
}