/* ========================
   CSS变量定义
   ======================== */
:root {
    /* 主色调 - 基于Illusion官方Logo配色 */
    --primary-color: #dc143c;
    --primary-dark: #b01030;
    --primary-light: #ff1f51;
    --secondary-color: #1a1a1a;
    --accent-color: #dc143c;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #dc143c 0%, #ff1f51 100%);
    --gradient-secondary: linear-gradient(135deg, #1a1a1a 0%, #3a3a3a 100%);
    --gradient-hero: linear-gradient(135deg, rgba(220, 20, 60, 0.95) 0%, rgba(255, 31, 81, 0.95) 100%);
    
    /* 中性色 */
    --text-dark: #2d3748;
    --text-medium: #4a5568;
    --text-light: #718096;
    --bg-white: #ffffff;
    --bg-light: #f7fafc;
    --bg-gray: #edf2f7;
    --border-color: #e2e8f0;
    
    /* 功能色 */
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --error-color: #f56565;
    --info-color: #4299e1;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* 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);
    
    /* 过渡 */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* 字体 */
    --font-primary: 'Noto Sans SC', sans-serif;
    --font-secondary: 'Poppins', sans-serif;
}

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

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

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

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

/* ========================
   返回顶部按钮
   ======================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    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);
}

/* ========================
   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: all var(--transition-base);
}

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #000;
    font-family: var(--font-secondary);
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

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

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

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

.nav-link.nav-cta {
    background: var(--gradient-primary);
    color: white;
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-full);
}

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

/* ========================
   主视觉区 - 紧凑版
   ======================== */
.hero {
    position: relative;
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 70px;
}

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

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

.hero-content {
    text-align: center;
    color: white;
    padding: var(--spacing-xl) 0;
    width: 100%;
}

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

.title-main {
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1.2;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.title-sub {
    font-size: 1.125rem;
    font-weight: 400;
    opacity: 0.9;
}

.hero-description {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
    line-height: 1.6;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
}

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

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: 0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.15);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.stat-item i {
    font-size: 1.75rem;
    opacity: 0.9;
}

.stat-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.125rem;
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    opacity: 0.85;
}

/* ========================
   通用区块样式
   ======================== */
section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

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

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

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

.feature-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    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: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    transition: all var(--transition-base);
}

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

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

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

/* ========================
   最新动态区
   ======================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.news-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

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

.news-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-light);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.news-badge {
    background: var(--gradient-primary);
    color: white;
    padding: 0.375rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.news-badge.badge-update {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.news-badge.badge-mod {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.news-badge.badge-tutorial {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.news-badge.badge-event {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.news-badge.badge-info {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

.news-date {
    color: var(--text-light);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

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

.news-excerpt {
    padding: 0 var(--spacing-md);
    color: var(--text-medium);
    line-height: 1.7;
    flex-grow: 1;
}

.news-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-md);
}

.news-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-base);
}

.news-link:hover {
    gap: 0.75rem;
}

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

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

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

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

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    transition: all var(--transition-base);
}

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

.faq-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.faq-question span:nth-child(2) {
    flex-grow: 1;
}

.faq-toggle {
    flex-shrink: 0;
    transition: transform var(--transition-base);
    color: var(--primary-color);
}

.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: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg) calc(var(--spacing-lg) + 40px + var(--spacing-md));
    color: var(--text-medium);
    line-height: 1.8;
}

/* ========================
   用户评价区
   ======================== */
.review-stats {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.overall-rating {
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.rating-number {
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

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

.rating-count {
    color: var(--text-light);
}

.rating-distribution {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.rating-label {
    min-width: 40px;
    font-weight: 500;
    color: var(--text-medium);
}

.bar-container {
    flex-grow: 1;
    height: 12px;
    background: var(--bg-gray);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.rating-percent {
    min-width: 45px;
    text-align: right;
    color: var(--text-light);
    font-size: 0.875rem;
}

.review-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.review-tag {
    background: var(--bg-light);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    border: 2px solid var(--primary-light);
}

.reviews-carousel {
    position: relative;
    padding: 0 50px;
}

.reviews-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    transition: all var(--transition-base);
}

.review-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-sm);
}

.reviewer-info {
    display: flex;
    gap: var(--spacing-md);
}

.reviewer-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.reviewer-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.reviewer-name {
    font-weight: 600;
    color: var(--text-dark);
}

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

.review-date {
    color: var(--text-light);
    font-size: 0.875rem;
    white-space: nowrap;
}

.review-content {
    color: var(--text-medium);
    line-height: 1.8;
    flex-grow: 1;
    margin-bottom: var(--spacing-md);
}

.review-footer {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.helpful-badge {
    color: var(--text-light);
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-full);
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    z-index: 10;
}

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

.prev-btn {
    left: 0;
}

.next-btn {
    right: 0;
}

/* ========================
   CTA区域
   ======================== */
.cta-section {
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

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

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

/* ========================
   底部信息
   ======================== */
.footer {
    background: linear-gradient(180deg, #2d3748 0%, #1a202c 100%);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

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

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

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

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

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

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-base);
}

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

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all var(--transition-base);
    display: inline-block;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer-legal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

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

.footer-legal-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.separator {
    color: rgba(255, 255, 255, 0.3);
}

/* ========================
   响应式设计
   ======================== */
@media (max-width: 1024px) {
    .reviews-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    /* 导航栏 */
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }
    
    .nav-menu.active {
        max-height: 400px;
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
    }
    
    /* Hero区 */
    .hero {
        min-height: auto;
        padding: var(--spacing-xl) 0;
    }
    
    .title-main {
        font-size: 2rem;
    }
    
    .title-sub {
        font-size: 1rem;
    }
    
    .hero-description {
        font-size: 0.9375rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-buttons {
        margin-bottom: var(--spacing-md);
    }
    
    .hero-stats {
        gap: var(--spacing-sm);
    }
    
    .stat-item {
        justify-content: center;
        padding: 0.625rem 1rem;
    }
    
    .stat-item i {
        font-size: 1.5rem;
    }
    
    .stat-number {
        font-size: 1.125rem;
    }
    
    /* 区块标题 */
    .section-title {
        font-size: 2rem;
    }
    
    /* 特色功能 */
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    /* 新闻动态 */
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    /* 评价区 */
    .review-stats {
        grid-template-columns: 1fr;
    }
    
    .reviews-carousel {
        padding: 0;
    }
    
    .reviews-container {
        grid-template-columns: 1fr;
    }
    
    .carousel-btn {
        display: none;
    }
    
    /* CTA */
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-description {
        font-size: 1rem;
    }
    
    /* 底部 */
    .footer-main {
        grid-template-columns: 1fr;
    }
    
    .footer-legal {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }
    
    .hero-content {
        padding: var(--spacing-md) 0;
    }
    
    .title-main {
        font-size: 1.75rem;
    }
    
    .title-sub {
        font-size: 0.9375rem;
    }
    
    .hero-description {
        font-size: 0.875rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 0.75rem 1.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .stat-item {
        padding: 0.5rem 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 1.5rem;
        right: 1.5rem;
    }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-in-out;
}

/* ========================
   打印样式
   ======================== */
@media print {
    .navbar,
    .back-to-top,
    .hero-buttons,
    .cta-section,
    .footer-social {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .hero {
        margin-top: 0;
        min-height: auto;
    }
}