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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* 导航栏样式 */
.navbar {
    background: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    font-size: 1.5em;
    font-weight: bold;
    color: #4285f4;
}

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

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

.nav-menu a:hover {
    color: #4285f4;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: #333;
    transition: 0.3s;
}

/* 移动端导航菜单样式 */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
        text-align: center;
    }

    .nav-menu a {
        display: block;
        padding: 10px;
        font-size: 1.1rem;
    }

    /* 汉堡菜单动画 */
    .nav-toggle.active span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
}

@media (max-width: 480px) {
    .nav-menu {
        padding: 15px;
    }

    .nav-menu a {
        font-size: 1rem;
        padding: 8px;
    }

    .nav-toggle span {
        width: 22px;
    }
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #4285f4, #34a853);
    color: white;
    padding: 120px 0 60px;
    text-align: center;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.header-text {
    flex: 1;
    text-align: left;
}

.header-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.banner-image {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.banner-image:hover {
    transform: scale(1.02);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-align: left;
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.9;
    margin-bottom: 40px;
    text-align: left;
}

.header-stats {
    display: flex;
    justify-content: flex-start;
    gap: 60px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2em;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 1.1em;
    opacity: 0.9;
}

/* 下载区域样式 */
.download-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.download-section h2 {
    font-size: 2.2rem;
    color: #333;
    margin-bottom: 15px;
    font-weight: 600;
}

.download-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4285f4, #34a853, #fbbc05, #ea4335);
}

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

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.download-card {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-color: rgba(66, 133, 244, 0.2);
}

.card-header {
    padding: 20px;
    background: linear-gradient(to right, #f8f9fa, #ffffff);
    display: flex;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid #eee;
}

.platform-icon {
    width: 48px;
    height: 48px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.platform-info {
    flex: 1;
}

.platform-info h3 {
    margin: 0;
    font-size: 1.3rem;
    color: #333;
    font-weight: 600;
}

.version-tag {
    display: inline-block;
    padding: 4px 8px;
    background: #e8f0fe;
    color: #1a73e8;
    border-radius: 6px;
    font-size: 0.8rem;
    margin-top: 5px;
    font-weight: 500;
}

.card-body {
    padding: 20px;
}

.feature-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.badge {
    padding: 4px 10px;
    background: #f1f3f4;
    color: #5f6368;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    color: #555;
    font-size: 0.95rem;
}

.check-icon {
    color: #34a853;
    margin-right: 8px;
    font-weight: bold;
    font-size: 1.1rem;
}

.download-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 1px solid #eee;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.info-label {
    font-size: 0.8rem;
    color: #666;
    font-weight: 500;
}

.info-value {
    font-size: 0.95rem;
    color: #333;
    font-weight: 600;
}

.download-btn {
    width: 100%;
    padding: 14px 20px;
    background: #1a73e8;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.download-btn:hover {
    background: #1557b0;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
}

.download-btn:hover::before {
    transform: translateX(100%);
}

.btn-icon {
    font-size: 1.2rem;
    margin-bottom: 2px;
}

.btn-subtext {
    font-size: 0.8rem;
    opacity: 0.9;
}

/* 特色功能区域 */
.features-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4285f4, #34a853, #fbbc05, #ea4335);
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.feature-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-color: rgba(66, 133, 244, 0.2);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.feature-icon.speed {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%234285f4"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm.5-13H11v6l5.25 3.15.75-1.23-4.5-2.67z"/></svg>');
}

.feature-icon.security {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2334a853"><path d="M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm0 10.99h7c-.53 4.12-3.28 7.79-7 8.94V12H5V6.3l7-3.11v8.8z"/></svg>');
}

.feature-icon.sync {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23fbbc05"><path d="M12 4V1L8 5l4 4V6c3.31 0 6 2.69 6 6 0 1.01-.25 1.97-.7 2.8l1.46 1.46C19.54 15.03 20 13.57 20 12c0-4.42-3.58-8-8-8zm0 14c-3.31 0-6-2.69-6-6 0-1.01.25-1.97.7-2.8L5.24 7.74C4.46 8.97 4 10.43 4 12c0 4.42 3.58 8 8 8v3l4-4-4-4v3z"/></svg>');
}

.feature-icon.extension {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23ea4335"><path d="M20.5 11H19V7c0-1.1-.9-2-2-2h-4V3.5C13 2.12 11.88 1 10.5 1S8 2.12 8 3.5V5H4c-1.1 0-1.99.9-1.99 2v3.8H3.5c1.49 0 2.7 1.21 2.7 2.7s-1.21 2.7-2.7 2.7H2V20c0 1.1.9 2 2 2h3.8v-1.5c0-1.49 1.21-2.7 2.7-2.7 1.49 0 2.7 1.21 2.7 2.7V22H17c1.1 0 2-.9 2-2v-4h1.5c1.38 0 2.5-1.12 2.5-2.5S21.88 11 20.5 11z"/></svg>');
}

.feature-icon.privacy {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%234285f4"><path d="M12 1L3 5v6c0 5.55 3.84 10.74 9 12 5.16-1.26 9-6.45 9-12V5l-9-4zm0 2.18l7 3.12v4.7c0 4.67-3.13 8.96-7 10.06-3.87-1.1-7-5.39-7-10.06v-4.7l7-3.12z"/></svg>');
}

.feature-icon.translate {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2334a853"><path d="M12.87 15.07l-2.54-2.51.03-.03c1.74-1.94 2.98-4.17 3.71-6.53H17V4h-7V2H8v2H1v1.99h11.17C11.5 7.92 10.44 9.75 9 11.35 8.07 10.32 7.3 9.19 6.69 8h-2c.73 1.63 1.73 3.17 2.98 4.56l-5.09 5.02L4 19l5-5 3.11 3.11.76-2.04zM18.5 10h-2L12 22h2l1.12-3h4.75L21 22h2l-4.5-12zm-2.62 7l1.62-4.33L19.12 17h-3.24z"/></svg>');
}

.feature-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-content h3 {
    color: #333;
    font-size: 1.3rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.feature-content p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.5;
}

.feature-details {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.feature-details li {
    background: #f1f3f4;
    color: #5f6368;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* 安装指南区域 */
.guide-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.guide-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4285f4, #34a853, #fbbc05, #ea4335);
}

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

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
    position: relative;
}

.guide-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 50%;
    width: 2px;
    height: calc(100% - 80px);
    background: linear-gradient(to bottom, #4285f4, #34a853);
    transform: translateX(-50%);
    z-index: 1;
}

.step {
    position: relative;
    z-index: 2;
    background: #ffffff;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-color: rgba(66, 133, 244, 0.2);
}

.step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #4285f4, #34a853);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0 auto 20px;
    box-shadow: 0 4px 10px rgba(66, 133, 244, 0.3);
}

.step-content {
    text-align: center;
}

.step-content h3 {
    color: #333;
    font-size: 1.3rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.step-content p {
    color: #666;
    margin-bottom: 20px;
    line-height: 1.5;
}

.step-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 20px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.detail-item:hover {
    background: #e8f0fe;
    transform: translateX(5px);
}

.detail-icon {
    font-size: 1.2rem;
}

.detail-text {
    color: #5f6368;
    font-size: 0.95rem;
    font-weight: 500;
}

.guide-tips {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid #eee;
}

.guide-tips h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 30px;
    font-weight: 600;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.tip-card {
    background: #ffffff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.tip-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.tip-icon {
    font-size: 2rem;
    margin-bottom: 15px;
}

.tip-card h4 {
    color: #333;
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.tip-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* FAQ区域 */
.faq-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.faq-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4285f4, #34a853, #fbbc05, #ea4335);
}

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

.faq-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.faq-card {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

.faq-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    border-color: rgba(66, 133, 244, 0.2);
}

.faq-icon {
    width: 48px;
    height: 48px;
    background: #e8f0fe;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    font-size: 1.5rem;
    color: #1a73e8;
}

.faq-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.faq-content h3 {
    margin: 0 0 10px 0;
    font-size: 1.1rem;
    color: #333;
    font-weight: 600;
}

.faq-content p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.4;
    font-size: 0.9rem;
}

.faq-details {
    list-style: none;
    padding: 0;
    margin: 0 0 15px 0;
}

.faq-details li {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    color: #555;
    font-size: 0.9rem;
    padding-left: 20px;
    position: relative;
}

.faq-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: #1a73e8;
    font-size: 1rem;
}

.faq-tip {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: auto;
}

.tip-icon {
    color: #1a73e8;
    font-size: 1.1rem;
}

.tip-text {
    color: #666;
    font-size: 0.85rem;
    line-height: 1.3;
}

.platform-list,
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 10px 0;
    flex-grow: 1;
}

.platform-item,
.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    background: #f8f9fa;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.security-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin: 10px 0;
    flex-grow: 1;
}

.security-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 6px;
    background: #f8f9fa;
    border-radius: 6px;
    transition: all 0.3s ease;
    text-align: center;
}

.security-icon {
    font-size: 1.1rem;
}

.security-text {
    color: #555;
    font-size: 0.8rem;
    line-height: 1.2;
}

/* 页脚样式 */
.footer {
    background: #333;
    color: white;
    padding: 30px 0 15px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    margin-bottom: 20px;
}

.footer-section h3 {
    margin-bottom: 15px;
    color: #fff;
    font-size: 1.1rem;
}

.footer-section p {
    font-size: 0.9rem;
    line-height: 1.4;
    opacity: 0.8;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section a {
    color: #fff;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
    font-size: 0.9rem;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
    opacity: 0.7;
}

/* 响应式设计优化 */
@media (max-width: 1200px) {
    .container {
        padding: 0 15px;
    }

    .header-content {
        gap: 30px;
    }

    .header h1 {
        font-size: 2.2rem;
    }

    .download-grid,
    .features-grid,
    .guide-steps,
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .header-stats {
        gap: 40px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .stat-label {
        font-size: 1rem;
    }
}

@media (max-width: 992px) {
    .header {
        padding: 100px 0 50px;
    }

    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .header-text {
        text-align: center;
    }

    .header h1 {
        text-align: center;
        font-size: 2rem;
    }

    .subtitle {
        text-align: center;
        font-size: 1.1rem;
    }

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

    .banner-image {
        max-width: 80%;
    }

    .download-card,
    .feature-card,
    .step,
    .faq-card {
        padding: 15px;
    }

    .card-header {
        padding: 12px;
    }

    .platform-icon {
        width: 40px;
        height: 40px;
    }

    .feature-icon {
        width: 48px;
        height: 48px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        display: flex;
        flex-direction: column;
        gap: 15px;
    }

    .nav-toggle {
        display: flex;
    }

    .header {
        padding: 80px 0 40px;
    }

    .header h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .header-stats {
        flex-direction: column;
        gap: 20px;
    }

    .download-grid,
    .features-grid,
    .guide-steps,
    .faq-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .download-card,
    .feature-card,
    .step,
    .faq-card {
        max-width: 500px;
        margin: 0 auto;
    }

    .guide-steps::before {
        display: none;
    }

    .step-number {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .feature-content h3,
    .step-content h3,
    .faq-content h3 {
        font-size: 1.1rem;
    }

    .feature-content p,
    .step-content p,
    .faq-content p {
        font-size: 0.9rem;
    }

    .feature-details li,
    .faq-details li {
        font-size: 0.85rem;
    }
}

@media (max-width: 576px) {
    .header {
        padding: 70px 0 30px;
    }

    .header h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    .header-stats {
        gap: 15px;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.9rem;
    }

    .banner-image {
        max-width: 90%;
    }

    .download-card,
    .feature-card,
    .step,
    .faq-card {
        padding: 12px;
    }

    .card-header {
        padding: 10px;
    }

    .platform-icon {
        width: 36px;
        height: 36px;
    }

    .feature-icon {
        width: 40px;
        height: 40px;
    }

    .feature-content h3,
    .step-content h3,
    .faq-content h3 {
        font-size: 1rem;
    }

    .feature-content p,
    .step-content p,
    .faq-content p {
        font-size: 0.85rem;
    }

    .feature-details li,
    .faq-details li {
        font-size: 0.8rem;
        margin-bottom: 6px;
    }

    .download-btn {
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    .btn-subtext {
        font-size: 0.75rem;
    }

    .section-desc {
        font-size: 0.9rem;
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 60px 0 25px;
    }

    .header h1 {
        font-size: 1.4rem;
    }

    .subtitle {
        font-size: 0.85rem;
    }

    .header-stats {
        gap: 12px;
    }

    .stat-number {
        font-size: 1.3rem;
    }

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

    .banner-image {
        max-width: 95%;
    }

    .download-card,
    .feature-card,
    .step,
    .faq-card {
        padding: 10px;
    }

    .card-header {
        padding: 8px;
    }

    .platform-icon {
        width: 32px;
        height: 32px;
    }

    .feature-icon {
        width: 36px;
        height: 36px;
    }

    .feature-content h3,
    .step-content h3,
    .faq-content h3 {
        font-size: 0.95rem;
    }

    .feature-content p,
    .step-content p,
    .faq-content p {
        font-size: 0.8rem;
    }

    .feature-details li,
    .faq-details li {
        font-size: 0.75rem;
        margin-bottom: 5px;
    }

    .download-btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }

    .btn-subtext {
        font-size: 0.7rem;
    }

    .section-desc {
        font-size: 0.85rem;
        padding: 0 10px;
    }

    .faq-tip {
        padding: 8px 10px;
    }

    .tip-text {
        font-size: 0.75rem;
    }
}

/* 添加section描述样式 */
.section-desc {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1em;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

@media (max-width: 1200px) {
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}