/* 重置样式和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background-color: #ffffff;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e7eb;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: #1f2937;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: #6b7280;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #6366f1;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: #6b7280;
    transition: all 0.3s ease;
}

/* 主横幅区域 */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    color: #1f2937;
}

.highlight {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #6b7280;
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: white;
    color: #6366f1;
    border: 2px solid #e5e7eb;
}

.btn-secondary:hover {
    border-color: #6366f1;
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
}

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

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.875rem;
    color: #6b7280;
}

/* 手机模型 */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: #1f2937;
    border-radius: 40px;
    padding: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: #374151;
    border-radius: 2px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 28px;
    padding: 40px 20px 20px;
    overflow: hidden;
}

.app-interface {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.word-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 100%;
}

.word-main {
    font-size: 24px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 8px;
}

.word-phonetic {
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 12px;
}

.word-meaning {
    font-size: 16px;
    color: #374151;
}

/* 功能特色 */
.features {
    padding: 100px 0;
    background: white;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.feature-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    border: 1px solid #f3f4f6;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

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

.feature-icon {
    margin-bottom: 24px;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 16px;
}

.feature-description {
    color: #6b7280;
    line-height: 1.6;
}

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

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

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.download-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.download-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 60px;
}

.download-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 16px 24px;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
    min-width: 180px;
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn-subtitle {
    font-size: 12px;
    opacity: 0.8;
}

.btn-title {
    font-size: 16px;
    font-weight: 600;
}

.qr-code {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.qr-image {
    background: white;
    border-radius: 12px;
    padding: 20px;
}

.qr-text {
    opacity: 0.9;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background: #f8fafc;
}

/* 联系我们部分样式 */
.contact-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info {
    padding-right: 20px;
}

.contact-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-description {
    font-size: 1.125rem;
    color: #718096;
    margin-bottom: 40px;
    line-height: 1.6;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.contact-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 4px;
}

.contact-text p {
    color: #718096;
    font-size: 0.9rem;
    margin: 0;
}

/* 联系表单样式 */
.contact-form {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 30px;
    text-align: center;
}

.message-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: #4a5568;
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    background: #f8fafc;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 24px;
}

.about-description {
    font-size: 1.125rem;
    color: #6b7280;
    line-height: 1.7;
    margin-bottom: 40px;
}

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

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

.team-illustration {
    display: flex;
    justify-content: center;
}

/* 页脚 */
.footer {
    background: #1f2937;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-description {
    color: #9ca3af;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-list a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 20px;
    text-align: center;
    color: #9ca3af;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
}

/* 页面标题样式 */
.page-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8rem 0 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.3;
}

.page-hero-content {
    position: relative;
    z-index: 2;
}

.page-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #ffffff, #f0f9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.breadcrumb a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.breadcrumb a:hover {
    opacity: 0.7;
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        transition: left 0.3s ease;
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .page-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 20px;
    }
    
    .phone-mockup {
        width: 240px;
        height: 480px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .download-features {
        flex-direction: column;
        gap: 16px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-title {
        font-size: 2rem;
    }
    
    .about-title {
        font-size: 2rem;
    }
    
    .about-stats {
        justify-content: center;
        gap: 20px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .nav-container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .phone-mockup {
        width: 200px;
        height: 400px;
    }
    
    .word-card {
        padding: 30px 20px;
    }
    
    .word-main {
        font-size: 20px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .download-title {
        font-size: 1.75rem;
    }
    
    .about-title {
        font-size: 1.75rem;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 16px;
    }
}

/* 功能页面样式 */
.features-detail {
    padding: 80px 0;
    background: #ffffff;
}

.feature-section {
    padding: 80px 0;
    border-bottom: 1px solid #f1f5f9;
}

.feature-section:last-child {
    border-bottom: none;
}

.feature-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.feature-section.reverse .feature-content {
    grid-template-columns: 1fr 1fr;
}

.feature-text {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature-badge {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: fit-content;
}

.feature-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    line-height: 1.2;
    margin: 0;
}

.feature-description {
    font-size: 1.125rem;
    color: #6b7280;
    line-height: 1.7;
    margin: 0;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    color: #374151;
}

.feature-list li::before {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: #10b981;
    color: white;
    border-radius: 50%;
    font-size: 12px;
    font-weight: bold;
    flex-shrink: 0;
}

.feature-stats {
    display: flex;
    gap: 40px;
    margin-top: 20px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    line-height: 1;
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: #6b7280;
    margin-top: 4px;
}

.feature-highlight {
    background: #f0f9ff;
    border-left: 4px solid #0ea5e9;
    padding: 16px 20px;
    border-radius: 8px;
    font-style: italic;
    color: #0c4a6e;
}

.feature-cta {
    margin-top: 20px;
}

.feature-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

/* AI演示样式 */
.ai-demo {
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 30px;
    max-width: 400px;
    width: 100%;
}

.demo-screen {
    background: #f8fafc;
    border-radius: 12px;
    padding: 20px;
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid #e5e7eb;
}

.demo-title {
    font-weight: 600;
    color: #1f2937;
}

.demo-status {
    font-size: 0.875rem;
    color: #10b981;
    display: flex;
    align-items: center;
    gap: 8px;
}

.demo-status::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.recommendation-card {
    background: white;
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.recommendation-card h4 {
    margin: 0 0 16px 0;
    font-size: 1rem;
    color: #1f2937;
}

.word-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #f3f4f6;
}

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

.word {
    font-weight: 600;
    color: #1f2937;
}

.strength {
    font-size: 0.875rem;
    color: #6b7280;
}

/* 记忆曲线样式 */
.memory-curve {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 30px;
    max-width: 400px;
    width: 100%;
}

.curve-chart {
    text-align: center;
}

.chart-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 20px;
}

.curve-line {
    margin-bottom: 20px;
}

.curve-svg {
    width: 100%;
    height: 120px;
}

.curve-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: #6b7280;
}

/* 闪卡样式 */
.flashcard-demo {
    perspective: 1000px;
    max-width: 350px;
    width: 100%;
}

.flashcard {
    position: relative;
    width: 100%;
    height: 280px;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    cursor: pointer;
}

.flashcard:hover {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 16px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.card-front {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.card-back {
    background: white;
    color: #1f2937;
    transform: rotateY(180deg);
    border: 1px solid #e5e7eb;
}

.card-image {
    margin-bottom: 20px;
}

.card-word {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 8px 0;
}

.card-phonetic {
    font-size: 1rem;
    opacity: 0.8;
    margin: 0 0 16px 0;
}

.card-audio {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.card-audio:hover {
    background: rgba(255, 255, 255, 0.3);
}

.card-back h4 {
    font-size: 1.25rem;
    margin: 0 0 16px 0;
    color: #1f2937;
}

.card-example {
    font-size: 1rem;
    line-height: 1.6;
    margin: 0 0 12px 0;
    font-style: italic;
}

.card-translation {
    font-size: 0.875rem;
    color: #6b7280;
    margin: 0;
}

/* 统计面板样式 */
.stats-dashboard {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 30px;
    max-width: 400px;
    width: 100%;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e5e7eb;
}

.dashboard-header h4 {
    margin: 0;
    font-size: 1.25rem;
    color: #1f2937;
}

.date-range {
    font-size: 0.875rem;
    color: #6b7280;
    background: #f3f4f6;
    padding: 4px 12px;
    border-radius: 12px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-card {
    background: #f8fafc;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 4px;
}

.stat-name {
    font-size: 0.875rem;
    color: #6b7280;
}

/* 更多功能网格 */
.more-features {
    padding: 80px 0;
    background: #f8fafc;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-card {
    background: white;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid #f1f5f9;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.feature-card .feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 12px 0;
}

.feature-card .feature-description {
    font-size: 1rem;
    color: #6b7280;
    line-height: 1.6;
    margin: 0;
}

/* CTA区域 */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 16px 0;
}

.cta-subtitle {
    font-size: 1.25rem;
    opacity: 0.9;
    margin: 0 0 40px 0;
}

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

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

/* 帮助页面样式 */
.help-search {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px 0;
    color: white;
}

/* 故障排除样式 */
.troubleshooting-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.trouble-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.trouble-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.trouble-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #e2e8f0;
}

.trouble-solutions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.solution-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: #f7fafc;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.solution-item:hover {
    background: #edf2f7;
    transform: translateX(4px);
}

.solution-step {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.solution-text {
    color: #4a5568;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* 联系我们样式 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.contact-card {
    background: white;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.contact-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.contact-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
}

.contact-description {
    color: #718096;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 24px;
}

.contact-link {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
    text-decoration: none;
    color: white;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 16px 60px 16px 20px;
    border: 2px solid #e5e7eb;
    border-radius: 50px;
    font-size: 1rem;
    background: white;
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: #667eea;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    color: white;
    cursor: pointer;
    transition: background 0.3s ease;
}

.search-btn:hover {
    background: #5a67d8;
}

.help-nav {
    padding: 60px 0;
}

.help-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.category-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid #f1f5f9;
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    color: inherit;
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.category-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 8px 0;
}

.category-card p {
    color: #6b7280;
    margin: 0;
    font-size: 0.875rem;
}

.help-section {
    padding: 80px 0;
    border-bottom: 1px solid #f1f5f9;
}

.help-section:last-child {
    border-bottom: none;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0 0 16px 0;
}

.section-subtitle {
    font-size: 1.25rem;
    color: #6b7280;
    margin: 0;
}

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

.step-item {
    display: flex;
    gap: 24px;
    margin-bottom: 40px;
    align-items: flex-start;
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 8px 0;
}

.step-description {
    color: #6b7280;
    line-height: 1.6;
    margin: 0 0 12px 0;
}

.step-tips {
    background: #f0f9ff;
    border-left: 4px solid #0ea5e9;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.875rem;
    color: #0c4a6e;
}

.step-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.option-tag {
    background: #e0e7ff;
    color: #3730a3;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

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

.guide-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
}

.guide-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.guide-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 12px 0;
}

.guide-description {
    color: #6b7280;
    line-height: 1.6;
    margin: 0 0 16px 0;
}

.guide-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.guide-list li {
    color: #374151;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.guide-list li::before {
    content: '•';
    color: #667eea;
    position: absolute;
    left: 0;
    font-weight: bold;
}

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

.tip-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
}

.tip-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.tip-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0;
}

.tip-level {
    background: #e0e7ff;
    color: #3730a3;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.tip-content {
    color: #6b7280;
    line-height: 1.6;
}

.tip-example {
    background: #f8fafc;
    border-radius: 8px;
    padding: 16px;
    margin-top: 16px;
}

.tip-example strong {
    color: #1f2937;
}

.tip-example ul {
    margin: 8px 0 0 0;
    padding-left: 20px;
}

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

.faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: #f8fafc;
}

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0;
}

.faq-toggle {
    font-size: 1.5rem;
    color: #6b7280;
    transition: transform 0.3s ease;
}

.faq-answer {
    padding: 0 24px 20px 24px;
    color: #6b7280;
    line-height: 1.6;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

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

/* 关于我们页面样式 */
.mission-section {
    padding: 80px 0;
}

.mission-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.mission-text {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.mission-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0;
}

.mission-description {
    font-size: 1.125rem;
    color: #6b7280;
    line-height: 1.7;
    margin: 0;
}

.mission-values {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.value-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.value-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.value-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 4px 0;
}

.value-content p {
    color: #6b7280;
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

.mission-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.mission-illustration {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

.team-section {
    padding: 80px 0;
    background: #f8fafc;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.team-member {
    background: white;
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
}

.member-avatar {
    margin-bottom: 20px;
}

.member-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 4px 0;
}

.member-role {
    color: #667eea;
    font-weight: 500;
    margin: 0 0 12px 0;
}

.member-bio {
    color: #6b7280;
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0;
}

.timeline-section {
    padding: 80px 0;
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #e5e7eb;
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-date {
    width: 120px;
    text-align: center;
    font-weight: 600;
    color: #667eea;
    background: white;
    padding: 8px;
    border-radius: 8px;
    border: 2px solid #667eea;
    position: relative;
    z-index: 2;
}

.timeline-content {
    flex: 1;
    background: white;
    border-radius: 12px;
    padding: 24px;
    margin: 0 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 8px 0;
}

.timeline-description {
    color: #6b7280;
    margin: 0;
    line-height: 1.5;
}

.achievements-section {
    padding: 80px 0;
    background: #f8fafc;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.achievement-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
    transition: transform 0.3s ease;
}

.achievement-card:hover {
    transform: translateY(-4px);
}

.achievement-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.achievement-number {
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 8px;
    display: block;
}

.achievement-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 8px;
    display: block;
}

.achievement-description {
    color: #6b7280;
    font-size: 0.875rem;
    margin: 0;
}

.partners-section {
    padding: 80px 0;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.partner-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
    transition: transform 0.3s ease;
}

.partner-card:hover {
    transform: translateY(-2px);
}

.partner-logo {
    margin-bottom: 16px;
}

.partner-name {
    font-size: 1rem;
    font-weight: 500;
    color: #1f2937;
    margin: 0;
}

/* 下载页面样式 */
.quick-download-section {
    padding: 80px 0;
}

.quick-download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.download-hero {
    display: contents;
}

.download-text {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0;
}

.download-description {
    font-size: 1.125rem;
    color: #6b7280;
    line-height: 1.7;
    margin: 0;
}

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

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

.stat-item .stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 4px;
}

.stat-item .stat-label {
    display: block;
    font-size: 0.875rem;
    color: #6b7280;
}

.download-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

.platforms-section {
    padding: 80px 0;
    background: #f8fafc;
}

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

.platform-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
    transition: transform 0.3s ease;
}

.platform-card:hover {
    transform: translateY(-4px);
}

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

.platform-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin: 0 0 8px 0;
}

.platform-description {
    color: #6b7280;
    margin: 0 0 16px 0;
}

.platform-requirements {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.requirement {
    background: #f3f4f6;
    color: #374151;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.platform-features {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.feature {
    color: #10b981;
    font-size: 0.875rem;
    font-weight: 500;
}

.platform-actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.platform-qr {
    text-align: center;
}

.qr-label {
    margin-top: 8px;
    font-size: 0.875rem;
    color: #6b7280;
    margin-bottom: 0;
}

.versions-section {
    padding: 80px 0;
}

/* 响应式设计 - 功能页面 */
@media (max-width: 1024px) {
    .feature-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .feature-section.reverse .feature-content {
        grid-template-columns: 1fr;
    }
    
    .feature-title {
        font-size: 2rem;
    }
    
    .feature-stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .features-detail {
        padding: 40px 0;
    }
    
    .feature-section {
        padding: 40px 0;
    }
    
    .feature-content {
        gap: 30px;
        padding: 0 16px;
    }
    
    .feature-title {
        font-size: 1.75rem;
    }
    
    .feature-visual {
        padding: 20px;
    }
    
    .ai-demo,
    .memory-curve,
    .stats-dashboard {
        max-width: 100%;
        padding: 20px;
    }
    
    .flashcard {
        height: 240px;
    }
    
    .card-front,
    .card-back {
        padding: 20px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 40px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-stats {
        gap: 20px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    /* 帮助页面响应式 */
    .help-categories {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .category-card {
        padding: 20px;
    }
    
    .step-item {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
    
    .guide-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .guide-card {
        padding: 20px;
    }
    
    .tip-card {
        padding: 20px;
    }
    
    .tip-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    /* 关于我们页面响应式 */
    .mission-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .mission-title {
        font-size: 2rem;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .team-member {
        padding: 20px;
    }
    
    .timeline::before {
        left: 24px;
    }
    
    .timeline-item {
        flex-direction: row !important;
        padding-left: 60px;
    }
    
    .timeline-date {
        position: absolute;
        left: -40px;
        width: 80px;
        font-size: 0.75rem;
        padding: 4px;
    }
    
    .timeline-content {
        margin: 0;
    }
    
    .achievements-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .achievement-card {
        padding: 20px;
    }
    
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .partner-card {
        padding: 16px;
    }
    
    /* 下载页面响应式 */
    .quick-download-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .download-title {
        font-size: 2rem;
    }
    
    .download-stats {
        justify-content: center;
        gap: 20px;
    }
    
    .platforms-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .platform-card {
        padding: 20px;
    }
    
    .platform-requirements {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .platform-qr {
        margin-top: 16px;
    }
}

@media (max-width: 480px) {
    .help-search {
        padding: 20px 0;
    }
    
    .search-input {
        padding: 12px 50px 12px 16px;
        font-size: 0.875rem;
    }
    
    .search-btn {
        width: 36px;
        height: 36px;
    }
    
    .help-nav {
        padding: 40px 0;
    }
    
    .help-categories {
        padding: 0 16px;
    }
    
    .category-card {
        padding: 16px;
    }
    
    .category-icon {
        font-size: 2rem;
    }
    
    .help-section {
        padding: 40px 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .mission-title,
    .download-title {
        font-size: 1.75rem;
    }
    
    .download-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-date {
        left: -35px;
        width: 70px;
        font-size: 0.625rem;
    }
    
    .partners-grid {
        grid-template-columns: 1fr;
    }
    
    /* 故障排除响应式 */
    .troubleshooting-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .trouble-card {
        padding: 20px;
    }
    
    .trouble-title {
        font-size: 1.1rem;
    }
    
    .solution-item {
        padding: 10px;
        gap: 10px;
    }
    
    .solution-step {
        width: 20px;
        height: 20px;
        font-size: 0.7rem;
    }
    
    .solution-text {
        font-size: 0.85rem;
    }
    
    /* 联系我们响应式 */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .contact-card {
        padding: 30px 20px;
    }
    
    .contact-icon {
        font-size: 2.5rem;
        margin-bottom: 16px;
    }
    
    .contact-title {
        font-size: 1.1rem;
    }
    
    .contact-description {
        font-size: 0.85rem;
        margin-bottom: 20px;
    }
    
    .contact-link {
        padding: 10px 20px;
        font-size: 0.85rem;
    }
    
    /* 关于我们页面联系部分响应式 */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-info {
        padding-right: 0;
    }
    
    .contact-title {
        font-size: 2rem;
        text-align: center;
    }
    
    .contact-description {
        text-align: center;
        margin-bottom: 30px;
    }
    
    .contact-item {
        padding: 16px;
        gap: 12px;
    }
    
    .contact-icon {
        width: 36px;
        height: 36px;
        font-size: 1.25rem;
    }
    
    .contact-text h4 {
        font-size: 0.9rem;
    }
    
    .contact-text p {
        font-size: 0.85rem;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
    
    .form-title {
        font-size: 1.25rem;
        margin-bottom: 24px;
    }
    
    .message-form {
        gap: 16px;
    }
    
    .form-group input,
    .form-group textarea {
        padding: 10px 14px;
        font-size: 0.85rem;
    }
    
    .form-group textarea {
        min-height: 100px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.8s ease-out;
}

.feature-card {
    animation: fadeInUp 0.8s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* 页面加载动画 */
@keyframes slideInFromTop {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 功能页面增强样式 */
.feature-section {
    animation: fadeInUp 0.8s ease-out;
}

.feature-section:nth-child(even) .feature-content {
    flex-direction: row-reverse;
}

.feature-visual {
    transition: transform 0.3s ease;
}

.feature-visual:hover {
    transform: scale(1.02);
}

.ai-demo, .demo-screen {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-radius: 16px;
    transition: box-shadow 0.3s ease;
}

.ai-demo:hover {
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

/* 帮助页面增强样式 */
.category-card {
    transition: all 0.3s ease;
    border-radius: 12px;
    overflow: hidden;
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.15);
}

.faq-item {
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.faq-question {
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background-color: #f8fafc;
}

/* 关于我们页面增强样式 */
.team-member {
    transition: all 0.3s ease;
    border-radius: 16px;
    overflow: hidden;
}

.team-member:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.team-member:hover .member-avatar {
    transform: scale(1.1);
}

.member-avatar {
    transition: transform 0.3s ease;
}

.timeline-item {
    animation: slideInFromLeft 0.8s ease-out;
}

.timeline-item:nth-child(even) {
    animation: slideInFromRight 0.8s ease-out;
}

.achievement-card {
    transition: all 0.3s ease;
}

.achievement-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

/* 下载页面增强样式 */
.platform-card {
    transition: all 0.3s ease;
    border-radius: 16px;
    overflow: hidden;
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.platform-icon {
    transition: transform 0.3s ease;
}

.platform-card:hover .platform-icon {
    transform: scale(1.1) rotate(5deg);
}

.version-card {
    transition: all 0.3s ease;
    border-radius: 12px;
    overflow: hidden;
}

.version-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.version-card.featured {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
    }
}

/* 通用增强效果 */
.btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: scale(0.98);
}

/* 页面标题增强 */
.page-title {
    animation: slideInFromTop 0.8s ease-out;
}

.page-subtitle {
    animation: slideInFromTop 0.8s ease-out 0.2s both;
}

.breadcrumb {
    animation: slideInFromTop 0.8s ease-out 0.4s both;
}

/* 下载页面下半部分样式 */
/* 版本对比区域 */
.versions-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.versions-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.version-column {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    border: 2px solid transparent;
}

.version-column:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.version-column.featured {
    border-color: #3b82f6;
    transform: scale(1.05);
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
}

.version-column.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.version-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #f59e0b;
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.version-header {
    text-align: center;
    margin-bottom: 30px;
}

.version-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 10px;
    color: inherit;
}

.version-price {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 10px;
    color: #3b82f6;
}

.version-column.featured .version-price {
    color: white;
}

.price-period {
    font-size: 16px;
    font-weight: 400;
    opacity: 0.7;
}

.version-description {
    font-size: 16px;
    opacity: 0.8;
    line-height: 1.5;
}

.version-features {
    margin-bottom: 30px;
}

.feature-item {
    display: flex;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.version-column.featured .feature-item {
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

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

.feature-item.disabled {
    opacity: 0.5;
}

.feature-icon {
    width: 20px;
    height: 20px;
    margin-right: 12px;
    font-weight: bold;
    color: #10b981;
}

.version-column.featured .feature-icon {
    color: #34d399;
}

.feature-item.disabled .feature-icon {
    color: #ef4444;
}

.feature-text {
    font-size: 15px;
    line-height: 1.4;
}

.version-btn {
    width: 100%;
    padding: 15px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.version-column.featured .version-btn {
    background: white;
    color: #3b82f6;
    border: 2px solid white;
}

.version-column.featured .version-btn:hover {
    background: transparent;
    color: white;
    border-color: white;
}

/* 安装指南区域 */
.installation-section {
    padding: 80px 0;
    background: white;
}

.installation-tabs {
    margin-top: 50px;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    background: #f1f5f9;
    border-radius: 12px;
    padding: 6px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    flex: 1;
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: white;
    color: #3b82f6;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

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

.step-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    padding: 25px;
    background: #f8fafc;
    border-radius: 16px;
    border-left: 4px solid #3b82f6;
    transition: all 0.3s ease;
}

.step-item:hover {
    background: #f1f5f9;
    transform: translateX(10px);
}

.step-number {
    width: 40px;
    height: 40px;
    background: #3b82f6;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    margin-right: 20px;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 20px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 8px;
}

.step-description {
    font-size: 16px;
    color: #64748b;
    line-height: 1.6;
}

/* 下载FAQ区域 */
.download-faq-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

.download-faq-section .faq-list {
    max-width: 800px;
    margin: 50px auto 0;
}

.download-faq-section .faq-item {
    background: white;
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.download-faq-section .faq-item:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.download-faq-section .faq-question {
    padding: 25px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background: white;
    transition: all 0.3s ease;
}

.download-faq-section .faq-question:hover {
    background: #f8fafc;
}

.download-faq-section .faq-question h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1e293b;
    margin: 0;
}

.download-faq-section .faq-toggle {
    width: 30px;
    height: 30px;
    background: #3b82f6;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.download-faq-section .faq-item.active .faq-toggle {
    background: #ef4444;
    transform: rotate(45deg);
}

.download-faq-section .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: #f8fafc;
}

.download-faq-section .faq-answer p {
    padding: 0 30px 25px;
    margin: 0;
    font-size: 16px;
    color: #64748b;
    line-height: 1.6;
}

/* CTA区域 */
.download-cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(45deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-description {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.6;
}

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

.btn-large {
    padding: 18px 36px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 12px;
    min-width: 180px;
}

.download-cta-section .btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.download-cta-section .btn-outline:hover {
    background: white;
    color: #3b82f6;
}

/* 响应式增强 */
@media (max-width: 768px) {
    .feature-section:nth-child(even) .feature-content {
        flex-direction: column;
    }
    
    .platform-card:hover,
    .team-member:hover,
    .category-card:hover {
        transform: none;
    }
    
    .btn:hover::before {
        width: 200px;
        height: 200px;
    }
    
    /* 下载页面响应式 */
    .versions-table {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .version-column.featured {
        transform: none;
    }
    
    .version-column:hover {
        transform: none;
    }
    
    .tab-buttons {
        max-width: 100%;
    }
    
    .step-item {
        flex-direction: column;
        text-align: center;
    }
    
    .step-item:hover {
        transform: none;
    }
    
    .step-number {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .cta-title {
        font-size: 28px;
    }
    
    .cta-description {
        font-size: 18px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-large {
        width: 100%;
        max-width: 300px;
    }
    
    .download-faq-section .faq-question {
        padding: 20px;
    }
    
    .download-faq-section .faq-answer p {
        padding: 0 20px 20px;
    }
}