/* 全局样式 */
:root {
    --primary-color: #4285f4;
    --primary-dark: #3367d6;
    --secondary-color: #34a853;
    --accent-color: #ea4335;
    --warning-color: #fbbc05;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-light: #80868b;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #dadce0;
    --shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    --shadow-hover: 0 1px 3px 0 rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

h1, h2, h3, h4 {
    font-weight: 500;
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: rgba(66, 133, 244, 0.08);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.logo img {
    margin-right: 10px;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--primary-color);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.download-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 24px;
    border-radius: 4px;
    font-weight: 500;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* 英雄区域 */
.hero {
    padding: 150px 0 80px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e8f0fe 100%);
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.hero-image {
    flex: 1;
}

.browser-window {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    background-color: white;
}

.browser-header {
    background-color: #f1f3f4;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.browser-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background-color: #ff5f57;
}

.dot.yellow {
    background-color: #ffbd2e;
}

.dot.green {
    background-color: #28ca42;
}

.browser-url-bar {
    flex: 1;
    background-color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.browser-content {
    height: 350px;
    overflow: hidden;
}

.browser-content img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 功能区域 */
.features {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.section-title {
    text-align: center;
    margin-bottom: 15px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 50px;
}

.features-slider {
    position: relative;
    overflow: hidden;
}

.slider-container {
    overflow: hidden;
    margin-bottom: 30px;
}

.slider-track {
    display: flex;
    gap: 30px;
    transition: transform 0.5s ease;
}

.feature-card {
    flex: 0 0 calc(25% - 23px);
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.feature-icon {
    margin-bottom: 20px;
}

.feature-icon img {
    width: 60px;
    height: 60px;
    object-fit: contain;
}

.feature-highlight {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 20px;
    background-color: var(--bg-light);
    padding: 10px 15px;
    border-radius: 6px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background-color: #e0e0e0;
    border-radius: 4px;
    margin: 0 15px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
}

.security-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.security-tag {
    background-color: #e8f0fe;
    color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.extensions-list {
    margin-top: 20px;
}

.extension-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.devices-showcase {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
    font-size: 2rem;
}

.slider-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
}

.slider-prev, .slider-next {
    background-color: var(--primary-color);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.slider-prev:hover, .slider-next:hover {
    background-color: var(--primary-dark);
}

.slider-dots {
    display: flex;
    gap: 10px;
}

.slider-dots .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ddd;
    cursor: pointer;
    transition: var(--transition);
}

.slider-dots .dot.active {
    background-color: var(--primary-color);
}

/* 对比表格 */
.comparison {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.comparison-table {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th, .comparison-table td {
    padding: 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background-color: var(--bg-light);
    font-weight: 500;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-better {
    color: var(--secondary-color);
    font-weight: 500;
}

/* 常见问题 */
.faq {
    padding: 80px 0;
}

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

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    transition: var(--transition);
}

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

.faq-question {
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background-color: white;
}

.faq-question h3 {
    margin-bottom: 0;
    font-size: 1.1rem;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 25px 25px;
    max-height: 1000px;
}

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

.faq-answer ul, .faq-answer ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

.faq-answer li {
    margin-bottom: 8px;
}

/* 号召区域 */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.cta-container {
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

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

.cta .btn-primary:hover {
    background-color: #f0f0f0;
}

.cta-note {
    margin-top: 20px;
    font-size: 0.9rem;
    opacity: 0.8;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 50px;
}

.footer-section h4 {
    color: white;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    color: white;
    font-size: 1.3rem;
    margin-bottom: 20px;
}

.footer-logo img {
    margin-right: 10px;
}

.footer-section p {
    margin-bottom: 20px;
    line-height: 1.6;
}

.footer-social {
    display: flex;
    align-items: center;
    gap: 15px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: #3c4043;
    color: white;
    border-radius: 50%;
    font-weight: bold;
}

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

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul a {
    color: #9aa0a6;
}

.footer-section ul 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-links a {
    color: #9aa0a6;
    margin: 0 10px;
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        gap: 40px;
    }
    
    .hero-content, .hero-image {
        width: 100%;
    }
    
    .feature-card {
        flex: 0 0 calc(50% - 15px);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: white;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    }
    
    .hero {
        padding: 130px 0 60px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.7rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .feature-card {
        flex: 0 0 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}
/* 下载页特定样式 */
.download-hero {
    padding: 150px 0 60px;
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    color: white;
    text-align: center;
}

.download-hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: white;
}

.download-hero .hero-subtitle {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto 40px;
    opacity: 0.9;
    color: white;
}

.download-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 50px;
}

.download-stat {
    display: flex;
    flex-direction: column;
}

.download-stat .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
}

.download-stat .stat-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

/* 操作系统选择 */
.os-selection {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.os-cards-container {
    position: relative;
    margin-top: 40px;
}

.os-cards-slider {
    display: flex;
    gap: 30px;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 10px 0 30px;
    scroll-behavior: smooth;
}

.os-cards-slider::-webkit-scrollbar {
    display: none;
}

.os-card {
    flex: 0 0 calc(25% - 23px);
    background-color: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.os-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.os-card-header {
    padding: 30px 30px 20px;
    text-align: center;
    background: linear-gradient(135deg, #4285f4 0%, #3367d6 100%);
    color: white;
}

.os-card-header .os-icon {
    font-size: 3.5rem;
    margin-bottom: 15px;
}

.os-card-header h3 {
    font-size: 1.8rem;
    margin-bottom: 5px;
    color: white;
}

.os-card-header .os-version {
    font-size: 0.9rem;
    opacity: 0.9;
}

.os-card-content {
    padding: 25px 30px;
    flex-grow: 1;
}

.os-requirements h4 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: #333;
}

.os-requirements ul {
    list-style-type: disc;
    padding-left: 20px;
    margin-bottom: 25px;
}

.os-requirements li {
    margin-bottom: 8px;
    color: #555;
    font-size: 0.9rem;
}

.os-download-info {
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
}

.os-download-info > div {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.os-download-info > div:last-child {
    margin-bottom: 0;
}

.os-download-info .label {
    color: #666;
}

.os-download-info .value {
    font-weight: 500;
    color: #333;
}

.os-download-btn {
    margin: 0 30px 20px;
    padding: 16px;
    background-color: #34a853;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.os-download-btn:hover {
    background-color: #2d9249;
    transform: scale(1.02);
}

.download-subtext {
    font-size: 0.85rem;
    opacity: 0.9;
    margin-top: 5px;
}

.os-options {
    display: flex;
    padding: 0 30px 25px;
    gap: 10px;
}

.os-option-btn {
    flex: 1;
    padding: 10px;
    background-color: transparent;
    border: 1px solid #dadce0;
    border-radius: 6px;
    color: #5f6368;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.os-option-btn:hover {
    background-color: #f1f3f4;
    border-color: #4285f4;
    color: #4285f4;
}

.mobile-download-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 0 30px 25px;
}

.mobile-download-btn {
    display: flex;
    align-items: center;
    padding: 15px;
    border-radius: 10px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.mobile-download-btn.android {
    background-color: #3ddc84;
    color: white;
}

.mobile-download-btn.ios {
    background-color: #000;
    color: white;
}

.mobile-download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.mobile-icon {
    font-size: 2rem;
    margin-right: 15px;
}

.mobile-download-info {
    display: flex;
    flex-direction: column;
}

.mobile-label {
    font-weight: 600;
    font-size: 1rem;
}

.mobile-subtext {
    font-size: 0.85rem;
    opacity: 0.9;
    margin-top: 3px;
}

.os-slider-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-top: 20px;
}

.os-slider-prev, .os-slider-next {
    background-color: #4285f4;
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.os-slider-prev:hover, .os-slider-next:hover {
    background-color: #3367d6;
    transform: scale(1.1);
}

.os-slider-dots {
    display: flex;
    gap: 12px;
}

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

.os-slider-dots .dot.active {
    background-color: #4285f4;
    transform: scale(1.2);
}

/* 下载详情区域 */
.download-details {
    padding: 80px 0;
    background-color: white;
}

.download-details-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.download-form-container {
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.download-form-container h2 {
    margin-bottom: 10px;
}

.form-description {
    color: #5f6368;
    margin-bottom: 30px;
}

.download-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 8px;
    color: #333;
}

.form-group select, .form-group input[type="email"] {
    padding: 14px 16px;
    border: 1px solid #dadce0;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: white;
}

.form-group select:focus, .form-group input[type="email"]:focus {
    outline: none;
    border-color: #4285f4;
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.2);
}

.form-note {
    font-size: 0.85rem;
    color: #80868b;
    margin-top: 5px;
}

.checkbox-group {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

.checkbox-group label {
    margin-bottom: 0;
    font-weight: normal;
}

.terms-link {
    color: #4285f4;
    text-decoration: underline;
}

.download-submit-btn {
    padding: 18px;
    background: linear-gradient(135deg, #4285f4 0%, #3367d6 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 10px;
}

.download-submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(66, 133, 244, 0.3);
}

.btn-text {
    font-size: 1.1rem;
}

.btn-subtext {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: 5px;
}

.direct-download-note {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #dadce0;
    text-align: center;
}

.direct-download-link {
    font-weight: 600;
    color: #4285f4;
    text-decoration: underline;
}

/* 下载说明 */
.download-instructions {
    padding: 40px;
    border-radius: 15px;
    background-color: white;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid #e8eaed;
}

.download-instructions h2 {
    margin-bottom: 30px;
}

.instructions-timeline {
    position: relative;
    padding-left: 30px;
    margin-bottom: 40px;
}

.instructions-timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: #4285f4;
}

.timeline-step {
    position: relative;
    margin-bottom: 30px;
}

.timeline-step:last-child {
    margin-bottom: 0;
}

.step-number {
    position: absolute;
    left: -40px;
    top: 0;
    width: 30px;
    height: 30px;
    background-color: #4285f4;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.step-content {
    padding-left: 20px;
}

.step-content h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #333;
}

.step-content p {
    color: #5f6368;
    font-size: 0.95rem;
    line-height: 1.6;
}

.troubleshooting h3 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.troubleshooting-accordion {
    border-radius: 10px;
    overflow: hidden;
}

.trouble-item {
    border: 1px solid #e8eaed;
    margin-bottom: 10px;
    border-radius: 8px;
    overflow: hidden;
}

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

.trouble-question {
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background-color: #f8f9fa;
    transition: all 0.3s ease;
}

.trouble-question:hover {
    background-color: #f1f3f4;
}

.trouble-question h4 {
    font-size: 1rem;
    margin-bottom: 0;
    color: #333;
}

.trouble-toggle {
    font-size: 1.5rem;
    color: #4285f4;
    transition: all 0.3s ease;
}

.trouble-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    background-color: white;
}

.trouble-item.active .trouble-answer {
    padding: 20px;
    max-height: 200px;
}

.trouble-item.active .trouble-toggle {
    transform: rotate(45deg);
}

.trouble-answer p {
    margin-bottom: 0;
    color: #5f6368;
    line-height: 1.6;
}

/* 直接下载区域 */
.direct-download {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.direct-download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.direct-download-card {
    background-color: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.direct-download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.direct-download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: #333;
    text-align: center;
}

.direct-download-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.direct-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 10px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.direct-link:hover {
    background-color: #e8f0fe;
    border-color: #4285f4;
    transform: translateY(-2px);
}

.link-text {
    font-weight: 500;
    font-size: 0.95rem;
}

.link-size {
    font-size: 0.85rem;
    color: #5f6368;
    background-color: white;
    padding: 3px 8px;
    border-radius: 4px;
}

.download-security-note {
    display: flex;
    align-items: center;
    gap: 25px;
    margin-top: 60px;
    padding: 30px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.security-icon {
    font-size: 3rem;
}

.security-content h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

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

/* 系统要求表格 */
.system-requirements {
    padding: 80px 0;
    background-color: white;
}

.table-scroll-wrapper {
    overflow-x: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.requirements-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.requirements-table th {
    background-color: #4285f4;
    color: white;
    font-weight: 500;
    text-align: left;
    padding: 18px 20px;
    white-space: nowrap;
}

.requirements-table td {
    padding: 18px 20px;
    border-bottom: 1px solid #e8eaed;
    color: #333;
}

.requirements-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

.requirements-table tr:hover {
    background-color: #e8f0fe;
}

.requirements-notes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 50px;
}

.note {
    background-color: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    border-left: 4px solid #4285f4;
}

.note h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #333;
    display: flex;
    align-items: center;
    gap: 10px;
}

.note p {
    color: #5f6368;
    line-height: 1.6;
    margin-bottom: 0;
}

/* 下载进度模拟 */
.download-progress-section {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.progress-simulator {
    background-color: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.progress-header h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 0;
}

.progress-speed {
    font-weight: 500;
    color: #4285f4;
}

.progress-container {
    margin-bottom: 30px;
}

.progress-bar {
    height: 20px;
    background-color: #e8eaed;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #34a853, #4285f4);
    border-radius: 10px;
    width: 0%;
    transition: width 0.5s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #5f6368;
}

.progress-percent {
    font-weight: 600;
    color: #4285f4;
}

.progress-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    margin-bottom: 40px;
}

.progress-btn {
    padding: 12px 24px;
    background-color: #4285f4;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.progress-btn:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
}

.progress-btn.secondary {
    background-color: #f1f3f4;
    color: #333;
}

.progress-btn.secondary:hover {
    background-color: #e8eaed;
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-left: auto;
}

.speed-control label {
    font-weight: 500;
    color: #333;
}

.speed-control input[type="range"] {
    width: 150px;
}

.speed-control #speed-value {
    min-width: 70px;
    font-weight: 500;
    color: #4285f4;
}

.progress-stages {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-top: 30px;
}

.progress-stages::before {
    content: '';
    position: absolute;
    top: 25px;
    left: 50px;
    right: 50px;
    height: 3px;
    background-color: #e8eaed;
    z-index: 1;
}

.stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
    flex: 1;
}

.stage.active .stage-icon {
    background-color: #4285f4;
    color: white;
    transform: scale(1.1);
}

.stage.active .stage-text {
    color: #4285f4;
    font-weight: 500;
}

.stage-icon {
    width: 50px;
    height: 50px;
    background-color: #f1f3f4;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 10px;
    transition: all 0.3s ease;
}

.stage-text {
    font-size: 0.9rem;
    color: #5f6368;
    text-align: center;
    transition: all 0.3s ease;
}

.download-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, #4285f4 0%, #0d47a1 100%);
    color: white;
    text-align: center;
}

.download-cta h2 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.download-cta p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.download-cta .btn-primary {
    background-color: white;
    color: #4285f4;
    font-weight: 600;
}

.download-cta .btn-primary:hover {
    background-color: #f0f0f0;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.download-cta .cta-note {
    margin-top: 25px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 下载模态框 */
.download-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.download-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: white;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    transform: translateY(30px);
    transition: all 0.3s ease;
}

.download-modal.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2rem;
    color: #5f6368;
    cursor: pointer;
    line-height: 1;
    transition: all 0.3s ease;
}

.modal-close:hover {
    color: #333;
    transform: scale(1.1);
}

.modal-header {
    padding: 30px 30px 20px;
    text-align: center;
    background-color: #f8f9fa;
}

.modal-header h3 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 0;
}

.modal-body {
    padding: 30px;
    text-align: center;
}

.modal-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.modal-body p {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 25px;
}

.modal-details {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    text-align: left;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

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

.detail-label {
    color: #5f6368;
    font-weight: 500;
}

.detail-value {
    color: #333;
    font-weight: 500;
}

.modal-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.modal-action-btn {
    flex: 1;
    padding: 15px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.modal-action-btn.primary {
    background-color: #34a853;
    color: white;
}

.modal-action-btn.primary:hover {
    background-color: #2d9249;
}

.modal-action-btn.secondary {
    background-color: #f1f3f4;
    color: #333;
}

.modal-action-btn.secondary:hover {
    background-color: #e8eaed;
}

.modal-note {
    font-size: 0.85rem;
    color: #5f6368;
    margin-bottom: 0;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .os-card {
        flex: 0 0 calc(33.333% - 20px);
    }
    
    .direct-download-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .download-details-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .os-card {
        flex: 0 0 calc(50% - 15px);
    }
    
    .requirements-notes {
        grid-template-columns: 1fr;
    }
    
    .progress-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .speed-control {
        margin-left: 0;
        justify-content: space-between;
    }
}

@media (max-width: 768px) {
    .download-hero h1 {
        font-size: 2.2rem;
    }
    
    .download-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .os-card {
        flex: 0 0 100%;
    }
    
    .direct-download-grid {
        grid-template-columns: 1fr;
    }
    
    .download-security-note {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .progress-stages {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .stage {
        flex: 0 0 calc(50% - 10px);
        margin-bottom: 20px;
    }
    
    .progress-stages::before {
        display: none;
    }
}