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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 图片优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 导航栏样式 */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 5px 0;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    transition: all 0.3s ease;
}

.navbar.scrolled .container {
    padding: 10px 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.nav-logo h1 {
    font-size: 24px;
    font-weight: 600;
    color: #1a73e8;
    transition: color 0.3s;
}

.nav-logo:hover h1 {
    color: #0d62d9;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: #5f6368;
    font-weight: 500;
    transition: all 0.3s;
    padding: 5px 0;
    position: relative;
}

.nav-menu a:hover {
    color: #1a73e8;
}

.nav-menu a.active {
    color: #1a73e8;
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #1a73e8;
    transform: scaleX(1);
    transform-origin: left;
    transition: transform 0.3s;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #1a73e8;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s;
}

.nav-menu a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.download-btn {
    background-color: #1a73e8;
    color: white !important;
    padding: 10px 20px !important;
    border-radius: 5px;
    transition: all 0.3s;
    border: 2px solid #1a73e8;
}

.download-btn:hover {
    background-color: #0d62d9;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(26, 115, 232, 0.3);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
    padding: 5px;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #5f6368;
    border-radius: 2px;
    transition: all 0.3s;
}

/* 按钮样式 */
.primary-btn, .secondary-btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    text-align: center;
}

.primary-btn {
    background-color: #1a73e8;
    color: white;
}

.primary-btn:hover {
    background-color: #0d62d9;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(26, 115, 232, 0.3);
}

.secondary-btn {
    background-color: transparent;
    color: #1a73e8;
    border: 2px solid #1a73e8;
}

.secondary-btn:hover {
    background-color: rgba(26, 115, 232, 0.1);
    transform: translateY(-3px);
}

.large-btn {
    padding: 15px 40px;
    font-size: 18px;
}

/* 英雄区域 */
.hero-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e8f0fe 100%);
    overflow: hidden;
    position: relative;
}

.hero-section .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.hero-content {
    flex: 1;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: #1a0dab;
    background: linear-gradient(90deg, #1a0dab, #1a73e8);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-content .subtitle {
    font-size: 20px;
    color: #5f6368;
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.version-info {
    font-size: 14px;
    color: #70757a;
    background: #fff;
    padding: 10px 15px;
    border-radius: 5px;
    display: inline-block;
    border-left: 4px solid #1a73e8;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.hero-image {
    flex: 1;
    text-align: right;
    position: relative;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.hero-image:hover img {
    transform: perspective(1000px) rotateY(0) rotateX(0);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: #5f6368;
    font-size: 14px;
    cursor: pointer;
    animation: fadeInUp 2s infinite;
}

.scroll-indicator .arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid #5f6368;
    border-bottom: 2px solid #5f6368;
    transform: rotate(45deg);
    margin: 10px auto 0;
    animation: bounce 2s infinite;
}

/* 通用部分样式 */
section {
    padding: 80px 0;
}

h2 {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 15px;
    color: #1a0dab;
    position: relative;
    padding-bottom: 15px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #4285f4, #34a853);
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: #5f6368;
    font-size: 18px;
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 特性滑块 */
.features-section {
    background: linear-gradient(180deg, #f8f9fa 0%, #fff 100%);
}

.slider-container {
    position: relative;
    overflow: hidden;
    margin: 0 auto;
    max-width: 1000px;
    padding: 20px 0;
}

.slider-wrapper {
    overflow: hidden;
    border-radius: 15px;
}

.feature-slider {
    display: flex;
    transition: transform 0.5s ease;
}

.slide {
    flex: 0 0 100%;
    padding: 0 10px;
}

.feature-card {
    background: #fff;
    border-radius: 15px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    height: 100%;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, #4285f4, #34a853);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 60px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #4285f4, #34a853);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #1a0dab;
}

.feature-card p {
    color: #5f6368;
    line-height: 1.6;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slider-btn:hover {
    background: #fff;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    transform: translateY(-50%) scale(1.1);
}

.prev-btn {
    left: 0;
}

.next-btn {
    right: 0;
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

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

.dot.active {
    background-color: #1a73e8;
    transform: scale(1.2);
}

/* 性能对比区域 */
.performance-section {
    background: #fff;
}

.performance-scroller {
    overflow-x: auto;
    padding-bottom: 20px;
    margin-top: 30px;
    cursor: grab;
}

.performance-scroller:active {
    cursor: grabbing;
}

.performance-scroller::-webkit-scrollbar {
    height: 8px;
}

.performance-scroller::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.performance-scroller::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.performance-scroller::-webkit-scrollbar-thumb:hover {
    background: #a1a1a1;
}

.comparison-cards {
    display: flex;
    gap: 30px;
    min-width: min-content;
    padding: 10px 5px;
}

.comparison-card {
    min-width: 350px;
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s;
}

.comparison-card:hover {
    transform: translateY(-10px);
}

.comparison-card h3 {
    margin-bottom: 25px;
    text-align: center;
    color: #1a0dab;
    font-size: 22px;
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.bar-label {
    font-weight: 500;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
}

.bar-container {
    height: 30px;
    background-color: #f1f3f4;
    border-radius: 15px;
    overflow: hidden;
    position: relative;
}

.bar {
    height: 100%;
    border-radius: 15px;
    position: relative;
    transition: width 1.5s ease-in-out;
    min-width: 40px;
}

.bar span {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: white;
    font-weight: 500;
    font-size: 14px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.chrome-bar {
    background: linear-gradient(90deg, #4285f4, #34a853);
}

.firefox-bar {
    background: linear-gradient(90deg, #ff7139, #ff9500);
}

.edge-bar {
    background: linear-gradient(90deg, #0078d4, #00a4ef);
}

.safari-bar {
    background: linear-gradient(90deg, #1bb1e7, #5ac8fa);
}

.scroll-hint {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    color: #5f6368;
    font-size: 14px;
    opacity: 0.8;
    animation: pulse 2s infinite;
}

.hint-arrow {
    font-size: 20px;
    animation: slide 2s infinite;
}

/* 安全区域手风琴 */
.security-section {
    background: linear-gradient(180deg, #fff 0%, #f8f9fa 100%);
}

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

.accordion-item {
    background: #fff;
    border-radius: 10px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    border-left: 4px solid transparent;
    transition: all 0.3s;
}

.accordion-item:hover {
    border-left-color: #4285f4;
}

.accordion-item.active {
    border-left-color: #34a853;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.accordion-header {
    padding: 25px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.3s;
    background: #fff;
}

.accordion-header:hover {
    background-color: #f8f9fa;
}

.accordion-header h3 {
    margin: 0;
    font-size: 20px;
    color: #1a0dab;
    transition: color 0.3s;
}

.accordion-item.active .accordion-header h3 {
    color: #34a853;
}

.accordion-icon {
    font-size: 24px;
    font-weight: 300;
    color: #5f6368;
    transition: all 0.3s;
}

.accordion-content {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.5s;
    background: #fff;
}

.accordion-item.active .accordion-content {
    padding: 0 30px 25px;
}

.accordion-content p {
    color: #5f6368;
    line-height: 1.6;
}

/* 更新日志区域 */
.updates-section {
    background: #fff;
}

.update-scroll-container {
    max-height: 500px;
    overflow-y: auto;
    padding-right: 10px;
    margin-top: 30px;
    border-radius: 10px;
    background: #f8f9fa;
    padding: 20px;
}

.update-scroll-container::-webkit-scrollbar {
    width: 8px;
}

.update-scroll-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.update-scroll-container::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.update-scroll-container::-webkit-scrollbar-thumb:hover {
    background: #a1a1a1;
}

.update-timeline {
    position: relative;
    padding-left: 30px;
}

.update-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, #4285f4, #34a853);
    border-radius: 2px;
}

.update-item {
    position: relative;
    margin-bottom: 40px;
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.update-item:hover {
    transform: translateX(10px);
}

.update-item::before {
    content: '';
    position: absolute;
    left: -36px;
    top: 25px;
    width: 16px;
    height: 16px;
    background-color: #4285f4;
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 2px #4285f4;
}

.update-date {
    font-weight: 600;
    color: #1a73e8;
    margin-bottom: 10px;
    font-size: 18px;
    display: inline-block;
    background: #e8f0fe;
    padding: 5px 15px;
    border-radius: 20px;
}

.update-content {
    background: #fff;
}

.update-content h3 {
    text-align: left;
    font-size: 22px;
    margin-bottom: 15px;
    color: #1a0dab;
}

.update-content ul {
    padding-left: 20px;
    color: #5f6368;
}

.update-content li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 5px;
}

.update-content li::before {
    content: '✓';
    position: absolute;
    left: -20px;
    color: #34a853;
    font-weight: bold;
}

.scroll-progress {
    margin-top: 30px;
    padding: 0 10px;
}

.progress-bar {
    height: 6px;
    background-color: #f1f3f4;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #4285f4, #34a853);
    border-radius: 3px;
    transition: width 0.1s;
}

.progress-text {
    text-align: center;
    color: #5f6368;
    font-size: 14px;
}

/* 下载引导区域 */
.download-cta {
    background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.05)"/></svg>');
    background-size: cover;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    color: white;
    font-size: 42px;
    margin-bottom: 20px;
}

.cta-content h2::after {
    background: white;
    left: 50%;
    transform: translateX(-50%);
}

.cta-content p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.platform-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.platform-icon {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: 500;
    backdrop-filter: blur(10px);
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.platform-icon:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

/* 下载页面特定样式 */
.download-hero {
    background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.05)"/></svg>');
    background-size: cover;
}

.download-hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.download-hero .subtitle {
    font-size: 20px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 30px;
    position: relative;
    z-index: 1;
}

.version-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 16px;
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.platform-section {
    background: #f8f9fa;
}

.platform-selector {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin: 40px 0;
}

.platform-card {
    background: white;
    border-radius: 15px;
    padding: 30px 20px;
    width: 200px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.4s ease;
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, #4285f4, #34a853);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.platform-card:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
    border-color: #4285f4;
}

.platform-card:hover::before {
    transform: scaleX(1);
}

.platform-card.selected {
    border-color: #34a853;
    box-shadow: 0 10px 30px rgba(52, 168, 83, 0.2);
}

.platform-card.selected::before {
    transform: scaleX(1);
    background: linear-gradient(90deg, #34a853, #0f9d58);
}

.platform-icon-large {
    font-size: 50px;
    margin-bottom: 15px;
    display: block;
}

.platform-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: #1a0dab;
}

.platform-card p {
    color: #5f6368;
    font-size: 14px;
    margin-bottom: 20px;
}

.download-platform-btn {
    background: #1a73e8;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    width: 100%;
}

.platform-card:hover .download-platform-btn {
    background: #0d62d9;
    transform: translateY(-2px);
}

.download-details {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    margin-top: 40px;
    animation: slideInUp 0.5s ease;
    border-top: 5px solid #4285f4;
}

.details-content h3 {
    font-size: 28px;
    margin-bottom: 15px;
    color: #1a0dab;
}

.details-content p {
    color: #5f6368;
    margin-bottom: 25px;
}

.download-info {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.info-item:last-child {
    border-bottom: none;
}

.info-item span:first-child {
    font-weight: 500;
    color: #5f6368;
}

.info-item span:last-child {
    font-weight: 600;
    color: #1a73e8;
}

.download-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.steps-section {
    background: white;
}

.download-steps {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin: 60px 0;
    gap: 20px;
}

.step-card {
    flex: 1;
    min-width: 250px;
    background: #f8f9fa;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    border-left: 5px solid #4285f4;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.1), rgba(52, 168, 83, 0.1));
    opacity: 0;
    transition: opacity 0.3s;
}

.step-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.step-card:hover::before {
    opacity: 1;
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #4285f4, #34a853);
    color: white;
    border-radius: 50%;
    line-height: 50px;
    font-weight: bold;
    margin-bottom: 20px;
    font-size: 20px;
    position: relative;
    z-index: 1;
}

.step-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #1a0dab;
    position: relative;
    z-index: 1;
}

.step-card p {
    color: #5f6368;
    position: relative;
    z-index: 1;
}

.requirements-section {
    background: #f8f9fa;
}

.requirements-table {
    width: 100%;
    border-collapse: collapse;
    margin: 40px 0;
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.requirements-table th, .requirements-table td {
    padding: 18px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.requirements-table th {
    background: linear-gradient(135deg, #4285f4, #34a853);
    color: white;
    font-weight: 600;
    position: sticky;
    top: 0;
}

.requirements-table tr:hover {
    background: #f8f9fa;
}

.faq-section {
    background: white;
}

.faq-container {
    max-width: 800px;
    margin: 60px auto;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05);
}

.faq-item {
    border-bottom: 1px solid #eee;
    background: white;
    transition: all 0.3s;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item.active {
    background: #f8f9fa;
}

.faq-question {
    font-weight: 600;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    transition: all 0.3s;
}

.faq-item.active .faq-question {
    color: #1a73e8;
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    padding: 0 30px;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 30px 25px;
}

.faq-answer p {
    color: #5f6368;
    line-height: 1.6;
}

.faq-icon {
    transition: transform 0.3s;
    font-size: 24px;
    font-weight: 300;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: #1a73e8;
}

.final-cta {
    background: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
    padding: 80px 0;
}

.cta-box {
    background: white;
    border-radius: 20px;
    padding: 60px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    max-width: 800px;
    margin: 0 auto;
}

.cta-box h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.cta-box p {
    color: #5f6368;
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 页脚 */
.footer {
    background-color: #202124;
    padding: 60px 0 30px;
    color: #9aa0a6;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: white;
}

.footer-logo img {
    filter: brightness(0) invert(1);
}

.footer-links {
    display: flex;
    gap: 60px;
    flex-wrap: wrap;
}

.link-column {
    display: flex;
    flex-direction: column;
    gap: 15px;
    min-width: 150px;
}

.link-column h4 {
    color: white;
    margin-bottom: 10px;
    font-size: 18px;
}

.link-column a {
    color: #9aa0a6;
    text-decoration: none;
    transition: color 0.3s;
}

.link-column a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #3c4043;
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-bottom p {
    max-width: 600px;
    font-size: 14px;
}

.footer-legal {
    display: flex;
    gap: 20px;
}

.footer-legal a {
    color: #9aa0a6;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.back-to-top:hover {
    background-color: #0d62d9;
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero-content h2 {
        font-size: 42px;
    }
    
    .cta-box {
        padding: 50px 40px;
    }
}

@media (max-width: 992px) {
    .hero-section .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content h2 {
        font-size: 36px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        text-align: center;
        margin-top: 30px;
    }
    
    h2 {
        font-size: 32px;
    }
    
    .footer-links {
        gap: 40px;
    }
    
    .download-steps {
        flex-direction: column;
    }
    
    .step-card {
        min-width: 100%;
    }
    
    .platform-card {
        width: 180px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        padding: 80px 30px 30px;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 1000;
        justify-content: flex-start;
        gap: 20px;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .mobile-menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 999;
        display: none;
    }
    
    .mobile-menu-overlay.active {
        display: block;
    }
    
    .slider-btn {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .prev-btn {
        left: 5px;
    }
    
    .next-btn {
        right: 5px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 30px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .cta-box {
        padding: 40px 20px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-buttons .primary-btn,
    .cta-buttons .secondary-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .download-details {
        padding: 30px 20px;
    }
    
    .download-actions {
        flex-direction: column;
    }
    
    .requirements-table {
        display: block;
        overflow-x: auto;
    }
}

@media (max-width: 576px) {
    .hero-content h2 {
        font-size: 28px;
    }
    
    .hero-content .subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .primary-btn, .secondary-btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .comparison-card {
        min-width: 280px;
        padding: 20px;
    }
    
    .accordion-header {
        padding: 20px;
    }
    
    .accordion-content {
        padding: 0 20px;
    }
    
    .accordion-item.active .accordion-content {
        padding: 0 20px 20px;
    }
    
    .platform-selector {
        flex-direction: column;
        align-items: center;
    }
    
    .platform-card {
        width: 100%;
        max-width: 300px;
    }
    
    .faq-question {
        padding: 20px;
        font-size: 16px;
    }
    
    .faq-answer {
        padding: 0 20px;
    }
    
    .faq-item.active .faq-answer {
        padding: 0 20px 20px;
    }
    
    .download-hero h1 {
        font-size: 36px;
    }
    
    .download-hero .subtitle {
        font-size: 18px;
    }
}