/* ============================================
   CSS变量 - 主题色统一管理
   ============================================ */
:root {
    /* 主色调 - 参考截图的浅蓝色 */
    --primary-color: #4A90E2;
    --primary-dark: #357ABD;
    --primary-light: #6BA3E8;
    
    /* 辅助色 - 柔和的紫色和粉色 */
    --secondary-color: #8B7EC8;
    --accent-color: #FF6B9D;
    
    /* 中性色 - 白色和浅灰色为主 */
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-dark: #2c2c2c;
    
    /* 渐变色 - 柔和的蓝色渐变 */
    --gradient-primary: linear-gradient(135deg, #4A90E2 0%, #6BA3E8 100%);
    --gradient-secondary: linear-gradient(135deg, #8B7EC8 0%, #A896D8 100%);
    --gradient-hero: linear-gradient(135deg, #E8F4FD 0%, #D0E8FB 100%);
    
    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    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-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.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;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: #4A90E2;
}

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

.nav-link.cta-link {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-link.cta-link::after {
    display: none;
}

.nav-link.cta-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: white;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

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

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

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

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

/* ============================================
   英雄区域
   ============================================ */
.hero {
    position: relative;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(80px + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0.5;
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    z-index: 1;
}

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

.title-main {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--primary-color);
    line-height: 1.2;
}

.title-sub {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

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

.hero-buttons .btn {
    padding: 0.75rem var(--spacing-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: white;
    color: #4A90E2;
    border: 2px solid #4A90E2;
}

.btn-secondary:hover {
    background: #4A90E2;
    color: white;
    transform: translateY(-2px);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-light);
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

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

/* ============================================
   通用区块样式
   ============================================ */
section {
    padding: var(--spacing-xl) 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* ============================================
   核心功能区域
   ============================================ */
.features {
    background-color: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

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

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    transition: transform var(--transition-base);
}

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

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   网站特色区域
   ============================================ */
.highlights {
    background: linear-gradient(180deg, #ffffff 0%, #f8f9fa 100%);
    position: relative;
    overflow: hidden;
}

.highlights::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(74, 144, 226, 0.2) 50%, transparent 100%);
}

.highlights-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.highlight-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 2px solid transparent;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.highlight-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4A90E2 0%, #8B7EC8 100%);
    transform: scaleX(0);
    transition: transform var(--transition-base);
    transform-origin: left;
}

.highlight-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(74, 144, 226, 0.2);
}

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

.highlight-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #4A90E2 0%, #8B7EC8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.3);
    transition: all var(--transition-base);
    position: relative;
}

.highlight-icon::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4A90E2 0%, #8B7EC8 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
}

.highlight-item:hover .highlight-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 30px rgba(74, 144, 226, 0.4);
}

.highlight-item:hover .highlight-icon::after {
    opacity: 0.3;
}

.highlight-text {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.highlight-text h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.highlight-text p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9375rem;
    margin: 0;
}

/* ============================================
   适用人群区域
   ============================================ */
.audience {
    background: var(--bg-secondary);
}

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

.audience-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    text-align: center;
}

.audience-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.audience-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, #8B7EC8 0%, #A896D8 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.audience-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

.audience-list {
    list-style: none;
    text-align: left;
    display: inline-block;
}

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

.audience-list i {
    color: #4A90E2;
    font-size: 0.875rem;
}

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

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

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

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

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

.faq-question:hover {
    background-color: rgba(74, 144, 226, 0.05);
}

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.faq-question i {
    color: var(--primary-color);
    font-size: 1rem;
    transition: transform var(--transition-base);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-base);
    padding: 0 var(--spacing-lg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

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

.testimonials-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-stars {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: var(--spacing-xs);
    color: #ffc107;
    font-size: 1.25rem;
}

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

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

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: white;
    color: var(--primary-color);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

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

.testimonials-carousel {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.testimonials-wrapper {
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.testimonials-track {
    display: flex;
    transition: transform var(--transition-base);
    gap: var(--spacing-md);
}

.testimonial-card {
    flex: 0 0 calc(33.333% - 1.33rem);
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

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

.testimonial-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.testimonial-info {
    flex: 1;
}

.testimonial-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-xs) 0;
}

.testimonial-rating {
    display: flex;
    gap: 2px;
    color: #ffc107;
    font-size: 0.875rem;
}

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

.testimonial-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.testimonial-tags span {
    display: inline-block;
    padding: 4px var(--spacing-xs);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: white;
    border: none;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.25rem;
    z-index: 10;
    transition: all var(--transition-base);
}

.carousel-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-50%) scale(1.1);
}

.carousel-prev {
    left: -25px;
}

.carousel-next {
    right: -25px;
}

.carousel-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

.carousel-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(74, 144, 226, 0.3);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.carousel-indicator.active {
    background: var(--primary-color);
    width: 30px;
    border-radius: 5px;
}

/* ============================================
   新闻/动态区
   ============================================ */
.news {
    background: white;
}

.news-list {
    max-width: 1000px;
    margin: 0 auto;
}

.news-item {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
    border-left: 4px solid transparent;
}

.news-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    border-left-color: var(--primary-color);
    transform: translateX(5px);
}

.news-date {
    flex-shrink: 0;
    width: 80px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.news-day {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.news-month {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.news-content {
    flex: 1;
}

.news-category {
    display: inline-block;
    padding: 4px var(--spacing-sm);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.news-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-sm) 0;
    line-height: 1.4;
}

.news-excerpt {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 var(--spacing-md) 0;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

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

.news-link i {
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
}

.news-link:hover i {
    transform: translateX(3px);
}

/* ============================================
   CTA区域
   ============================================ */
.cta {
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: white;
}

.cta-description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    line-height: 1.7;
}

.btn-cta {
    background: white;
    color: #4A90E2;
    font-size: 1.25rem;
    padding: var(--spacing-md) var(--spacing-xl);
    box-shadow: var(--shadow-xl);
}

.btn-cta:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* 按钮涟漪效果 */
.btn {
    position: relative;
    overflow: hidden;
}

.btn .ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    transform: scale(0);
    animation: ripple-animation 0.6s ease-out;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* ============================================
   页面内容样式（用于子页面）
   ============================================ */
.page-content {
    padding: calc(80px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
    min-height: calc(100vh - 200px);
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--bg-secondary);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.manual-content,
.policy-content {
    max-width: 900px;
    margin: 0 auto;
}

.manual-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

.manual-section h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.manual-section h2 i {
    font-size: 1.5rem;
}

.manual-item {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
    border-left: 2px solid rgba(74, 144, 226, 0.2);
}

.manual-item:last-child {
    margin-bottom: 0;
}

.manual-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.manual-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

.policy-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.policy-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

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

.policy-section ul {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.policy-section ul li {
    margin-bottom: var(--spacing-xs);
}

.policy-update {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    text-align: center;
    color: var(--text-secondary);
}

.policy-update p {
    margin: 0;
}

/* ============================================
   文章页面样式
   ============================================ */
.article-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--bg-secondary);
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.article-category {
    display: inline-block;
    padding: 6px var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
}

.article-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.article-excerpt {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 800px;
    margin: 0 auto;
}

.article-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.article-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    font-size: 1.0625rem;
}

.article-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--bg-secondary);
}

.article-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article-content ul,
.article-content ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.article-content ul li,
.article-content ol li {
    margin-bottom: var(--spacing-xs);
}

.article-content pre {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
    border-left: 4px solid var(--primary-color);
}

.article-content code {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.article-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--bg-secondary);
    flex-wrap: wrap;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
    opacity: 0.9;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

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

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-md) 0;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
        padding: var(--spacing-sm);
    }
    
    .nav-link.cta-link {
        margin: var(--spacing-sm);
        display: inline-block;
    }
    
    .title-main {
        font-size: 2.5rem;
    }
    
    .title-sub {
        font-size: 1.25rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid,
    .highlights-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .audience-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-stats {
        gap: var(--spacing-md);
    }
    
    .testimonial-card {
        flex: 0 0 100%;
    }
    
    .carousel-prev {
        left: 10px;
    }
    
    .carousel-next {
        right: 10px;
    }
    
    .testimonials-track {
        gap: var(--spacing-md);
    }
    
    .faq-question {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .faq-question h3 {
        font-size: 1rem;
    }
    
    .testimonials-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .testimonials-tags {
        gap: var(--spacing-xs);
    }
    
    .tag {
        font-size: 0.75rem;
        padding: 6px var(--spacing-sm);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .news-item {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .news-date {
        width: 100%;
        flex-direction: row;
        justify-content: flex-start;
        gap: var(--spacing-sm);
    }
    
    .news-day {
        font-size: 1.5rem;
        margin-bottom: 0;
    }
    
    .news-month {
        font-size: 1rem;
        align-self: center;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        justify-content: center;
    }
    
    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 1024px) {
    .testimonial-card {
        flex: 0 0 calc(50% - 1rem);
    }
}

@media (max-width: 768px) {
    .testimonial-card {
        flex: 0 0 100%;
    }
}

@media (max-width: 1024px) {
    .features-grid,
    .highlights-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .features-grid,
    .highlights-content {
        grid-template-columns: 1fr;
    }
    
    .highlight-item {
        padding: var(--spacing-lg);
    }
    
    .highlight-icon {
        width: 70px;
        height: 70px;
        font-size: 1.75rem;
    }
    
    .highlight-text h3 {
        font-size: 1.125rem;
    }
    
    .highlight-text p {
        font-size: 0.875rem;
    }
    
    .page-content {
        padding: calc(80px + var(--spacing-md)) var(--spacing-sm) var(--spacing-md);
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1.125rem;
    }
    
    .manual-section,
    .policy-section {
        padding: var(--spacing-md);
    }
    
    .manual-section h2 {
        font-size: 1.5rem;
    }
    
    .policy-section h2 {
        font-size: 1.25rem;
    }
}

@media (max-width: 768px) {
    .article-title {
        font-size: 2rem;
    }
    
    .article-excerpt {
        font-size: 1.125rem;
    }
    
    .article-content {
        padding: var(--spacing-md);
    }
    
    .article-content h2 {
        font-size: 1.5rem;
    }
    
    .article-content h3 {
        font-size: 1.25rem;
    }
    
    .article-content p {
        font-size: 1rem;
    }
    
    .article-footer {
        flex-direction: column;
        align-items: stretch;
    }
    
    .article-footer .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .title-main {
        font-size: 2rem;
    }
    
    .cta-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .carousel-prev {
        left: 5px;
    }
    
    .carousel-next {
        right: 5px;
    }
    
    .article-title {
        font-size: 1.75rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}