/* CSS 变量定义 */
:root {
    --primary-color: #9F7AEA;
    --primary-hover: #8B5CF6;
    --secondary-color: #B794F6;
    --accent-color: #06b6d4;
    --purple-gradient: linear-gradient(135deg, #B794F6 0%, #9F7AEA 100%);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --background: #ffffff;
    --background-secondary: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* 字体系统 */
    --font-brand: "Nunito", sans-serif;
    --font-system: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", system-ui, sans-serif;
}

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

body {
    font-family: var(--font-system);
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-brand);
}

.nav-logo .app-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    margin-right: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    object-fit: cover;
}

.nav-logo i {
    margin-right: 0.5rem;
    font-size: 1.8rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #6366f1;
}

/* 语言切换器样式 */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    margin-left: 2rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #6b7280;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.lang-btn:hover {
    border-color: #6366f1;
    color: #6366f1;
}

.lang-btn.active {
    background: var(--primary-color);
    border-color: #6366f1;
    color: white;
}

.lang-btn::before {
    content: '';
    width: 16px;
    height: 16px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.lang-btn[data-lang="en"]::before {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 60 30"><clipPath id="a"><path d="M30 15h30v15zv15H0zH0V0z"/></clipPath><clipPath id="b"><path d="M30 15h30v15zv15H0zH0V0z"/></clipPath><g clip-path="url(%23a)"><path d="M0 0v30h60V0z" fill="%23012169"/><path d="M0 0L60 30m0-30L0 30" stroke="%23fff" stroke-width="6"/><path d="M0 0L60 30m0-30L0 30" clip-path="url(%23b)" stroke="%23C8102E" stroke-width="4"/><path d="M30 0v30M0 15h60" stroke="%23fff" stroke-width="10"/><path d="M30 0v30M0 15h60" stroke="%23C8102E" stroke-width="6"/></g></svg>');
}

.lang-btn[data-lang="zh"]::before {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 900 600"><path fill="%23DE2910" d="M0 0h900v600H0z"/><path d="M450 100l50 150h160l-130 95 50 150-130-95-130 95 50-150-130-95h160z" fill="%23FFDE00"/></svg>');
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 首页英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--purple-gradient);
    color: white;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.hero-app-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    margin-right: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    object-fit: cover;
    animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0;
    background: linear-gradient(45deg, #fff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-brand);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    opacity: 0.9;
    font-family: var(--font-system);
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
    line-height: 1.8;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    font-family: var(--font-system);
}

.btn i {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}

.btn-primary {
    background: #fff;
    color: #6366f1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: #6366f1;
    transform: translateY(-2px);
}

/* 视频容器 */
.video-container {
    position: relative;
    width: 280px;
    max-width: 85vw;
    aspect-ratio: 443/960;
    border-radius: 25px;
    overflow: hidden;
    box-shadow: 
        0 25px 50px rgba(159, 122, 234, 0.3),
        0 15px 30px rgba(0, 0, 0, 0.2);
    transform: rotate(3deg);
    animation: videoFloat 6s ease-in-out infinite;
    background: var(--purple-gradient);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 25px;
    transition: transform 0.3s ease;
}

.video-container:hover .hero-video {
    transform: scale(1.02);
}

.video-controls {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.video-container:hover .video-controls {
    opacity: 1;
}

.video-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.9);
    color: var(--primary-color);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.video-btn:hover {
    background: white;
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        45deg,
        rgba(159, 122, 234, 0.1) 0%,
        rgba(124, 58, 237, 0.1) 50%,
        rgba(99, 102, 241, 0.1) 100%
    );
    display: flex;
    align-items: flex-end;
    padding: 30px;
    pointer-events: none;
}

.video-info {
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.video-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 0.5s forwards;
    font-family: var(--font-system);
}

.video-info p {
    font-size: 1rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 0.7s forwards;
}

@keyframes videoFloat {
    0%, 100% {
        transform: rotate(3deg) translateY(0px);
    }
    50% {
        transform: rotate(3deg) translateY(-15px);
    }
}

@keyframes fadeInUp {
    to {
        opacity: 0.9;
        transform: translateY(0);
    }
}

/* 视频加载失败时的备用显示 */
.video-fallback {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--purple-gradient);
    border-radius: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fallback-content {
    text-align: center;
    color: white;
}

.app-mockup {
    position: relative;
    margin: 0 auto;
}

.phone-frame {
    width: 160px;
    aspect-ratio: 443/960;
    background: #1a1a1a;
    border-radius: 25px;
    padding: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.screen-content {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.sleep-dashboard {
    text-align: center;
    color: white;
}

.sleep-score {
    margin-bottom: 30px;
}

.score-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.score-label {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 500;
}

.sleep-chart {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 8px;
    height: 60px;
}

.chart-bar {
    width: 12px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 6px;
    animation: chartGrow 1.5s ease-out;
}

@keyframes chartGrow {
    from {
        height: 0;
    }
    to {
        height: var(--final-height);
    }
}

/* 功能特性区域 */
.features {
    padding: 6rem 0;
    background: #f8fafc;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #1e293b;
    font-family: var(--font-system);
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
    font-family: var(--font-system);
}

.feature-card p {
    color: #64748b;
    line-height: 1.6;
}

/* 下载区域 */
.download {
    padding: 6rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.download-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.download-content p {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    background: white;
    color: #333;
    padding: 1rem 2rem;
    border-radius: 15px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: var(--font-system);
    min-width: 200px;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.download-btn i {
    font-size: 2rem;
    margin-right: 1rem;
}

.download-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.download-label {
    font-size: 0.9rem;
    opacity: 0.7;
}

.download-platform {
    font-weight: 600;
    font-size: 1.1rem;
}

/* 关于我们区域 */
.about {
    padding: 6rem 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: #1e293b;
}

.about-text p {
    font-size: 1.1rem;
    color: #64748b;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-stats {
    display: flex;
    gap: 3rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #6366f1;
    font-family: var(--font-system);
}

.stat-label {
    font-size: 0.9rem;
    color: #64748b;
}

.team-illustration {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.team-illustration i {
    font-size: 4rem;
    color: white;
}

/* 联系方式区域 */
.contact {
    padding: 6rem 0;
    background: #f8fafc;
}

.contact-content {
    max-width: 1200px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    justify-content: space-between;
    gap: 3rem;
    align-items: stretch;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    flex: 1;
    min-width: 0;
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.contact-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-right: 1.5rem;
    margin-top: 0.2rem;
    flex-shrink: 0;
}

.contact-item h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: #1e293b;
    line-height: 1.3;
    font-family: var(--font-system);
}

.contact-item p {
    color: #64748b;
    line-height: 1.6;
    font-size: 1rem;
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    font-family: var(--font-brand);
}

.footer-app-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    margin-right: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    object-fit: cover;
}

.footer-logo i {
    margin-right: 0.5rem;
    color: #6366f1;
}

.footer-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #6366f1;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background: #374151;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* 应用截图展示区域 */
.app-showcase {
    padding: 80px 0;
    background: var(--background-secondary);
    text-align: center;
}

.app-showcase h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.app-showcase p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.screenshot-item {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.screenshot-item:hover {
    transform: translateY(-10px);
}

.screenshot-item img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 15px;
    margin-bottom: 1rem;
}

.screenshot-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.screenshot-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.highlight-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

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

.highlight-card .icon {
    width: 60px;
    height: 60px;
    background: var(--purple-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: white;
}

.highlight-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-family: var(--font-system);
}

.highlight-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* 海报画廊样式 */
.poster-gallery {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.poster-gallery h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 1rem;
}

.poster-gallery p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 轮播容器 */
.poster-carousel-container {
    position: relative;
    max-width: 1200px;
    margin: 0 auto 5rem;
}

.poster-carousel {
    position: relative;
    width: 100%;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.poster-slide {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    width: fit-content;
    max-width: 100%;
}

.poster-slide.active {
    opacity: 1;
}

.poster-item {
    flex: 0 0 auto;
    width: 200px;
    transition: transform 0.3s ease;
    cursor: pointer;
}

.poster-item:hover {
    transform: translateY(-8px) scale(1.02);
}

.poster-item img {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s ease;
    display: block;
}

.poster-item:hover img {
    box-shadow: 0 8px 25px rgba(159, 122, 234, 0.3);
}



/* 轮播导航 */
.carousel-nav {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    pointer-events: none;
}

.carousel-btn {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary-color);
    cursor: pointer;
    transition: all 0.3s ease;
    pointer-events: auto;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

/* 点状指示器 */
.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    padding: 20px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #d1d5db;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active,
.dot:hover {
    background: var(--primary-color);
    transform: scale(1.2);
}



/* 灯箱模态框 */
.lightbox-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
}

.lightbox-content {
    position: relative;
    margin: auto;
    padding: 20px;
    width: 90%;
    max-width: 1000px;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-close {
    position: absolute;
    top: 30px;
    right: 30px;
    color: white;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    z-index: 2001;
    transition: color 0.3s ease;
}

.lightbox-close:hover {
    color: var(--secondary-color);
}

#lightboxImage {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 10px;
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    pointer-events: none;
}

.lightbox-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    pointer-events: auto;
}

.lightbox-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .contact-content {
        max-width: 900px;
    }
    
    .contact-info {
        gap: 2rem;
    }
    
    .contact-item {
        padding: 2rem;
    }
    
    .contact-item i {
        font-size: 2rem;
        margin-right: 1.2rem;
    }
    
    .contact-item h3 {
        font-size: 1.3rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .language-switcher {
        margin-left: 1rem;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-app-icon {
        width: 60px;
        height: 60px;
        border-radius: 15px;
        margin-right: 0.8rem;
    }
    
    .nav-logo .app-icon {
        width: 28px;
        height: 28px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .video-container {
        width: 240px;
        max-width: 80vw;
        aspect-ratio: 443/960;
        transform: rotate(2deg);
    }
    
    .video-controls {
        gap: 12px;
    }
    
    .video-btn {
        width: 40px;
        height: 40px;
        font-size: 14px;
    }
    
    .video-info h3 {
        font-size: 1.2rem;
    }
    
    .video-info p {
        font-size: 0.9rem;
    }

    .feature-highlights {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .highlight-card {
        padding: 1.5rem;
    }

    .app-showcase h2 {
        font-size: 2rem;
    }

    .app-showcase p {
        font-size: 1rem;
        margin-bottom: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-stats {
        justify-content: center;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .contact-info {
        flex-direction: column;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-app-icon {
        width: 50px;
        height: 50px;
        border-radius: 12px;
        margin-right: 0.6rem;
    }
    
    .nav-logo .app-icon {
        width: 24px;
        height: 24px;
    }
    
    .footer-app-icon {
        width: 28px;
        height: 28px;
    }

    .section-title {
        font-size: 2rem;
    }

    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }

    .download-btn {
        min-width: 150px;
        padding: 0.8rem 1.5rem;
    }

    .language-switcher {
        margin-left: 0.5rem;
    }

    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    .video-container {
        width: 180px;
        max-width: 85vw;
        aspect-ratio: 443/960;
        transform: rotate(1deg);
    }
    
    .video-controls {
        bottom: 15px;
        gap: 10px;
    }
    
    .video-btn {
        width: 35px;
        height: 35px;
        font-size: 12px;
    }
    
    .video-overlay {
        padding: 20px;
    }
    
    .video-info h3 {
        font-size: 1rem;
    }
    
    .video-info p {
        font-size: 0.8rem;
    }

    .feature-highlights {
        grid-template-columns: 1fr;
    }

    .highlight-card .icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    .app-showcase {
        padding: 60px 0;
    }

    .poster-gallery {
        padding: 60px 0;
    }

    .poster-gallery h2 {
        font-size: 2rem;
    }

    .poster-carousel {
        min-height: 350px;
    }

    .poster-slide {
        gap: 1rem;
    }

    .poster-slide .poster-item:nth-child(n+3) {
        display: none;
    }

    .poster-item {
        width: 140px;
    }

    .poster-item img {
        border-radius: 12px;
    }

    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}