/* 小蓝视频 - 全新原创样式 */
/* 域名: darflex.cn */

:root {
    --primary-color: #e84393;
    --primary-dark: #c0392b;
    --secondary-color: #fd79a8;
    --accent-color: #ff6b6b;
    --bg-dark: #1a1a2e;
    --bg-darker: #16213e;
    --bg-card: #0f3460;
    --text-light: #ffffff;
    --text-muted: #b2bec3;
    --gold: #f1c40f;
    --success: #00b894;
    --gradient-primary: linear-gradient(135deg, #e84393 0%, #fd79a8 50%, #ff6b6b 100%);
    --gradient-dark: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    --shadow-soft: 0 4px 20px rgba(232, 67, 147, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--gradient-dark);
    color: var(--text-light);
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 导航栏 - 非sticky */
.nav-wrapper {
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(232, 67, 147, 0.2);
    padding: 0.75rem 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.nav-brand img {
    height: 48px;
    width: auto;
}

.nav-brand-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-menu a {
    display: block;
    padding: 0.6rem 1.2rem;
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: var(--gradient-primary);
    transform: translateY(-2px);
}

.nav-cta {
    background: var(--gradient-primary);
    padding: 0.7rem 1.8rem;
    border-radius: var(--radius-xl);
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
}

.nav-cta:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 30px rgba(232, 67, 147, 0.5);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Hero区域 */
.hero-section {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 4rem 1.5rem;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.3;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(15, 52, 96, 0.8) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(232, 67, 147, 0.2);
    border: 1px solid var(--primary-color);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-xl);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-title span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 1rem 2.5rem;
    border-radius: var(--radius-xl);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-soft);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 40px rgba(232, 67, 147, 0.5);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--text-light);
    padding: 1rem 2.5rem;
    border-radius: var(--radius-xl);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

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

/* 通用容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 章节标题 */
.section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-label {
    display: inline-block;
    background: rgba(232, 67, 147, 0.15);
    color: var(--primary-color);
    padding: 0.4rem 1.2rem;
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 视频卡片网格 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.video-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.4s ease;
    box-shadow: var(--shadow-card);
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(232, 67, 147, 0.3);
}

.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.1);
}

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s ease;
}

.video-card:hover .video-play-btn {
    opacity: 1;
}

.video-play-btn::after {
    content: '';
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent white;
    margin-left: 4px;
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.video-info {
    padding: 1.5rem;
}

.video-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.video-rating {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--gold);
}

.video-views {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* 栏目导航卡片 */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-darker) 100%);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    color: var(--text-light);
    transition: all 0.4s ease;
    border: 1px solid rgba(232, 67, 147, 0.1);
}

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

.category-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.category-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.category-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 关于我们 */
.about-section {
    background: linear-gradient(180deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

.about-content h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.about-content p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-md);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* 国际合作 */
.collab-section {
    background: var(--bg-darker);
}

.collab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.collab-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.collab-card:hover {
    transform: scale(1.03);
}

.collab-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.collab-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.collab-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 支付方式 */
.payment-section {
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-card) 100%);
}

.payment-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.payment-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 1.5rem 2.5rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.payment-item img {
    height: 40px;
    width: auto;
}

.payment-item span {
    font-weight: 500;
}

/* 用户评论 */
.reviews-section {
    background: var(--bg-dark);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

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

.review-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.review-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.review-user h4 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.review-user span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.review-rating {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.review-rating .star {
    color: var(--gold);
    font-size: 1.1rem;
}

.review-content {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.review-date {
    color: var(--text-muted);
    font-size: 0.85rem;
    opacity: 0.7;
}

/* FAQ */
.faq-section {
    background: var(--bg-darker);
}

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

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow: hidden;
    border: 1px solid rgba(232, 67, 147, 0.1);
}

.faq-question {
    width: 100%;
    padding: 1.5rem 2rem;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: rgba(232, 67, 147, 0.1);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

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

.faq-answer-content {
    padding: 0 2rem 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* 客户支持 */
.support-section {
    background: var(--bg-dark);
}

.support-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.support-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.support-card:hover {
    transform: translateY(-5px);
    border: 1px solid var(--primary-color);
}

.support-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: rgba(232, 67, 147, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.support-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.support-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 制作资质 */
.license-section {
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-card) 100%);
    border-top: 1px solid rgba(232, 67, 147, 0.2);
    border-bottom: 1px solid rgba(232, 67, 147, 0.2);
}

.license-content {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 3rem;
}

.license-badge {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    background: rgba(0, 184, 148, 0.1);
    border: 1px solid var(--success);
    border-radius: var(--radius-md);
}

.license-badge .icon {
    font-size: 2rem;
    color: var(--success);
}

.license-info h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

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

.age-badge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: rgba(231, 76, 60, 0.15);
    border: 2px solid #e74c3c;
    border-radius: var(--radius-md);
}

.age-badge .number {
    font-size: 2rem;
    font-weight: 800;
    color: #e74c3c;
}

.age-badge span {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* 面包屑导航 */
.breadcrumb {
    padding: 1rem 0;
    background: rgba(0, 0, 0, 0.2);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    flex-wrap: wrap;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-list a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb-list a:hover {
    color: var(--primary-color);
}

.breadcrumb-list .separator {
    color: var(--text-muted);
    opacity: 0.5;
}

.breadcrumb-list .current {
    color: var(--primary-color);
}

/* 页脚 */
.footer {
    background: var(--bg-darker);
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(232, 67, 147, 0.2);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand img {
    height: 50px;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    max-width: 300px;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-payment {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-payment img {
    height: 30px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.footer-payment img:hover {
    opacity: 1;
}

/* 内页样式 */
.page-header {
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-card) 100%);
    padding: 4rem 0;
    text-align: center;
}

.page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* 内容区域 */
.content-section {
    padding: 4rem 0;
}

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

.content-wrapper h2 {
    font-size: 1.8rem;
    margin: 2.5rem 0 1.5rem;
    color: var(--text-light);
}

.content-wrapper h3 {
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
    color: var(--secondary-color);
}

.content-wrapper p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.content-wrapper ul,
.content-wrapper ol {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.content-wrapper li {
    margin-bottom: 0.75rem;
}

/* 下载页面 */
.download-section {
    padding: 5rem 0;
    text-align: center;
}

.download-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 3rem;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: var(--shadow-card);
}

.download-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.download-icon img {
    width: 80px;
    height: 80px;
}

.download-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.download-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1.2rem 2rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.download-btn:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-soft);
}

.download-btn.android {
    background: linear-gradient(135deg, #3ddc84 0%, #00c853 100%);
}

.download-btn.ios {
    background: linear-gradient(135deg, #007aff 0%, #5856d6 100%);
}

.download-qr {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.download-qr img {
    width: 150px;
    height: 150px;
    background: white;
    padding: 10px;
    border-radius: var(--radius-md);
}

.download-qr p {
    margin-top: 1rem;
    font-size: 0.9rem;
}

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

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-darker);
        flex-direction: column;
        padding: 1rem;
        border-top: 1px solid rgba(232, 67, 147, 0.2);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-cta {
        display: none;
    }
    
    .hero-section {
        min-height: 70vh;
        padding: 3rem 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .license-content {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
}

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

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

/* 懒加载图片 - 确保无JS时也能显示 */
img[loading="lazy"] {
    opacity: 1;
}

/* 仅当JS启用时才使用渐显效果 */
.js-enabled img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.js-enabled img[loading="lazy"].loaded {
    opacity: 1;
}