/* ========================================
   CSS变量定义
   ======================================== */
:root {
    /* 主题颜色 - 参考Fantia配色 */
    --color-primary: #e94d8a;
    --color-primary-light: #ff6ba8;
    --color-primary-dark: #d63975;
    
    --color-secondary: #a855f7;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-info: #3b82f6;
    --color-danger: #ef4444;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-pink: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-purple: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-rainbow: linear-gradient(90deg, #84fab0 0%, #8fd3f4 25%, #a8edea 50%, #fed6e3 75%, #fbc2eb 100%);
    
    /* 灰度色 */
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-lighter: #9ca3af;
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    --color-bg-dark: #f3f4f6;
    --color-border: #e5e7eb;
    
    /* 功能色图标背景 */
    --color-pink: #ec4899;
    --color-purple: #a855f7;
    --color-blue: #3b82f6;
    --color-orange: #f97316;
    --color-green: #10b981;
    --color-cyan: #06b6d4;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* 字体 */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* 边框圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition: all 0.3s ease;
}

/* ========================================
   基础样式
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.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, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

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

.logo img {
    height: 20px;
    width: auto;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-text {
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cn-text {
    font-size: 0.9em;
    opacity: 0.9;
}

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

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: var(--transition);
}

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

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

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

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

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

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ========================================
   Hero区域
   ======================================== */
.hero {
    position: relative;
    background: linear-gradient(135deg, #faf5ff 0%, #f3e8ff 50%, #ede9fe 100%);
    padding: 5rem 0 4rem;
    margin-top: 70px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(233, 77, 138, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 50%);
    opacity: 1;
}

.hero-content {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-text {
    color: var(--color-text);
    text-align: center;
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

.gradient-text {
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-light);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    justify-content: center;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    flex-wrap: wrap;
}

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

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

.stat-item i {
    font-size: 2rem;
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ========================================
   内容页面样式
   ======================================== */
.page-content {
    padding: 6rem 0 var(--spacing-2xl);
    margin-top: 70px;
    min-height: calc(100vh - 70px);
    background: linear-gradient(180deg, #faf5ff 0%, #ffffff 20%);
    position: relative;
}

.page-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(180deg, rgba(233, 77, 138, 0.05) 0%, transparent 100%);
    pointer-events: none;
}

.content-container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(233, 77, 138, 0.1);
}

.content-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 3px solid;
    border-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 100%) 1;
    position: relative;
}

.content-header::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-pink);
    border-radius: var(--radius-full);
}

.content-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.content-meta {
    color: var(--color-text-light);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.content-meta i {
    color: var(--color-primary);
    margin-right: 0.25rem;
}

.content-body {
    line-height: 1.9;
    color: var(--color-text);
    font-size: 1.0625rem;
}

.content-body > p:first-child {
    font-size: 1.125rem;
    color: var(--color-text);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(233, 77, 138, 0.05) 0%, rgba(168, 85, 247, 0.05) 100%);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
}

.content-body h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    position: relative;
    padding-left: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
}

.content-body h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.3em;
    width: 4px;
    height: 1.2em;
    background: var(--gradient-pink);
    border-radius: var(--radius-full);
}

.content-body h2:first-of-type {
    margin-top: var(--spacing-lg);
}

.content-body h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    padding-left: var(--spacing-sm);
    border-left: 3px solid var(--color-primary);
}

.content-body h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.content-body p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-light);
    text-align: justify;
}

.content-body ul,
.content-body ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
    color: var(--color-text-light);
}

.content-body ul {
    list-style: none;
    padding-left: var(--spacing-lg);
}

.content-body ul li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.content-body ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.1em;
}

.content-body ol li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
    padding-left: var(--spacing-xs);
}

.content-body strong {
    color: var(--color-text);
    font-weight: 600;
}

.content-body a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
    padding-bottom: 1px;
}

.content-body a:hover {
    border-bottom-color: var(--color-primary);
    color: var(--color-primary-dark);
}

.content-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(233, 77, 138, 0.08);
    transition: var(--transition);
}

.content-section:hover {
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border-color: rgba(233, 77, 138, 0.15);
}

.content-section:last-child {
    margin-bottom: 0;
}

.content-section h2 {
    margin-top: 0;
    padding-top: 0;
}

.content-section h2:first-child {
    margin-top: 0;
}

/* ========================================
   Section通用样式
   ======================================== */
section {
    padding: var(--spacing-2xl) 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
}

/* ========================================
   功能特色区
   ======================================== */
.features {
    background: var(--color-bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: white;
    margin-bottom: var(--spacing-md);
}

.feature-icon.pink { background: linear-gradient(135deg, #ec4899, #f472b6); }
.feature-icon.purple { background: linear-gradient(135deg, #a855f7, #c084fc); }
.feature-icon.blue { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
.feature-icon.orange { background: linear-gradient(135deg, #f97316, #fb923c); }
.feature-icon.green { background: linear-gradient(135deg, #10b981, #34d399); }
.feature-icon.cyan { background: linear-gradient(135deg, #06b6d4, #22d3ee); }

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.feature-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) 0;
    color: var(--color-text-light);
}

.feature-list i {
    color: var(--color-success);
    font-size: 0.875rem;
}

.cta-banner {
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    margin-top: var(--spacing-xl);
}

.cta-banner h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta-banner p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

/* ========================================
   适用人群区
   ======================================== */
.audience {
    background: white;
}

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

.audience-card {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--color-bg-light);
    transition: var(--transition);
}

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

.audience-card i {
    font-size: 3rem;
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.audience-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.audience-card p {
    color: var(--color-text-light);
}

/* ========================================
   新闻动态区
   ======================================== */
.news {
    background: var(--color-bg-light);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.news-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
}

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

.news-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.news-badge.important {
    background: #fee2e2;
    color: #dc2626;
}

.news-badge.update {
    background: #dbeafe;
    color: #2563eb;
}

.news-badge.feature {
    background: #fef3c7;
    color: #d97706;
}

.news-badge.event {
    background: #f3e8ff;
    color: #9333ea;
}

.news-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-lighter);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.news-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.news-excerpt {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.news-link:hover {
    gap: var(--spacing-sm);
}

/* ========================================
   常见问题区
   ======================================== */
.faq {
    background: white;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: var(--transition);
}

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

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    cursor: pointer;
    user-select: none;
}

.faq-question h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

.faq-question i {
    color: var(--color-primary);
    transition: var(--transition);
}

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

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

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

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ========================================
   用户评价区
   ======================================== */
.reviews {
    background: var(--color-bg-light);
}

.rating-overview {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.rating-score {
    margin-bottom: var(--spacing-lg);
}

.score-number {
    font-size: 4rem;
    font-weight: 900;
    background: var(--gradient-pink);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stars {
    font-size: 1.5rem;
    color: #fbbf24;
    margin: var(--spacing-sm) 0;
}

.rating-count {
    color: var(--color-text-light);
    font-size: 1rem;
}

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

.tag {
    padding: 0.5rem 1rem;
    background: var(--color-bg-light);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.reviews-slider {
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.reviews-track {
    display: flex;
    gap: var(--spacing-lg);
    transition: transform 0.5s ease;
}

.review-card {
    min-width: calc(33.333% - var(--spacing-lg));
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.review-header {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.reviewer-avatar {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--gradient-pink);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.reviewer-info {
    flex: 1;
}

.reviewer-name {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.review-stars {
    color: #fbbf24;
    font-size: 0.875rem;
}

.review-text {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.review-date {
    color: var(--color-text-lighter);
    font-size: 0.875rem;
}

.slider-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.slider-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-primary);
    background: white;
    color: var(--color-primary);
    cursor: pointer;
    transition: var(--transition);
}

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

.slider-dots {
    display: flex;
    gap: var(--spacing-xs);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--color-primary);
    width: 30px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: #1f2937;
    color: #d1d5db;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-section h3 {
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-title {
    color: white;
}

.footer-description {
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

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

.social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--color-primary);
    transform: translateY(-3px);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: #d1d5db;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
}

.copyright {
    color: #9ca3af;
}

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

.footer-legal a {
    color: #d1d5db;
    text-decoration: none;
    transition: var(--transition);
}

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

.divider {
    color: #6b7280;
}

/* ========================================
   返回顶部按钮
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--gradient-pink);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-5px);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .review-card {
        min-width: calc(50% - var(--spacing-lg));
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .content-container {
        padding: var(--spacing-lg);
    }
    
    .content-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero {
        padding: 4rem 0 3rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .hero-buttons {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-stats {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .stat-item {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-sm);
        gap: 0.25rem;
    }
    
    .stat-item i {
        font-size: 1.5rem;
        margin-bottom: 0;
        line-height: 1;
    }
    
    .stat-content {
        gap: 0.125rem;
    }
    
    .stat-number {
        font-size: 1.25rem;
        line-height: 1.2;
    }
    
    .stat-label {
        font-size: 0.75rem;
        line-height: 1.2;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .audience-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .review-card {
        min-width: 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xs);
    }
    
    .hero-buttons .btn-large {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xs);
    }
    
    .stat-item {
        padding: var(--spacing-xs);
        gap: 0.2rem;
    }
    
    .stat-item i {
        font-size: 1.25rem;
        margin-bottom: 0;
        line-height: 1;
    }
    
    .stat-content {
        gap: 0.1rem;
    }
    
    .stat-number {
        font-size: 1rem;
        line-height: 1.2;
    }
    
    .stat-label {
        font-size: 0.7rem;
        line-height: 1.2;
    }
    
    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
    }
    
    .page-content {
        padding: 5rem 0 var(--spacing-xl);
    }
    
    .content-container {
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
    }
    
    .content-title {
        font-size: 1.75rem;
    }
    
    .content-body h2 {
        font-size: 1.5rem;
        padding-left: var(--spacing-sm);
    }
    
    .content-body h2::before {
        width: 3px;
    }
    
    .content-body h3 {
        font-size: 1.25rem;
        padding-left: var(--spacing-xs);
        border-left-width: 2px;
    }
    
    .content-body > p:first-child {
        font-size: 1rem;
        padding: var(--spacing-sm);
    }
    
    .content-section {
        padding: var(--spacing-md);
    }
    
    .content-meta {
        font-size: 0.8125rem;
        gap: var(--spacing-sm);
    }
}