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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 5%;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .logo {
    display: flex;
    align-items: center;
    color: white;
}

header .logo .emoji {
    font-size: 2rem;
    margin-right: 0.5rem;
}

header .logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

header nav {
    float: right;
    margin-top: -2.5rem;
}

header nav ul {
    list-style: none;
    display: flex;
}

header nav ul li {
    margin-left: 2rem;
}

header nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

header nav ul li a:hover,
header nav ul li a.active {
    background: rgba(255,255,255,0.2);
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 5%;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: white;
    color: #667eea;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 1px solid white;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.features {
    padding: 4rem 5%;
    background: white;
}

.features h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #333;
}

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

.feature-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-emoji {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
}

.about-brief, .news-preview, .download {
    padding: 4rem 5%;
    background: white;
    margin-top: 2rem;
}

.about-brief h3, .news-preview h3, .download h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #333;
}

.about-brief p {
    margin-bottom: 1.5rem;
    color: #666;
    font-size: 1.1rem;
    line-height: 1.8;
}

.news-list {
    margin-bottom: 2rem;
}

.news-item {
    display: flex;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
}

.news-time {
    color: #999;
    margin-right: 1.5rem;
    font-size: 0.9rem;
}

.news-item a {
    color: #333;
    text-decoration: none;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.news-item a:hover {
    color: #667eea;
}

.download-options {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
}

.download-card {
    background: #f8f9fa;
    padding: 2rem 3rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.download-emoji {
    font-size: 3rem;
    margin-bottom: 1rem;
}

footer {
    background: #333;
    color: white;
    padding: 3rem 5%;
    margin-top: 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section p {
    color: #999;
}

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

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

.footer-section ul li a {
    color: #999;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #444;
    margin-top: 2rem;
    color: #999;
}

.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 5%;
    text-align: center;
}

.page-header h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    opacity: 0.9;
}

.product-features {
    padding: 4rem 5%;
    background: white;
}

.product-features h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.feature-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.feature-info h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.feature-info p {
    color: #666;
    line-height: 1.6;
}

.product-categories {
    padding: 4rem 5%;
    background: #f8f9fa;
}

.product-categories h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
}

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

.category-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.category-emoji {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.category-card h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.category-card p {
    color: #666;
}

.download-section {
    padding: 4rem 5%;
    background: white;
    text-align: center;
}

.download-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.download-section p {
    color: #666;
    margin-bottom: 2rem;
}

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

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: #333;
    color: white;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
}

.download-btn .btn-emoji {
    font-size: 2rem;
}

.download-btn .btn-title {
    display: block;
    font-weight: 600;
}

.download-btn .btn-subtitle {
    display: block;
    font-size: 0.8rem;
    opacity: 0.8;
}

.download-btn.android {
    background: #4CAF50;
}

.news-container {
    padding: 4rem 5%;
    background: white;
}

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

.news-card {
    background: #f8f9fa;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.news-card.featured {
    grid-column: span 2;
}

.news-image {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 3rem;
    text-align: center;
    font-size: 3rem;
}

.news-content {
    padding: 1.5rem;
}

.news-tag {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: #667eea;
    color: white;
    font-size: 0.8rem;
    border-radius: 20px;
    margin-bottom: 1rem;
}

.news-content h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #333;
}

.news-content p {
    color: #666;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.news-meta {
    display: flex;
    gap: 1rem;
    color: #999;
    font-size: 0.9rem;
}

.news-pagination {
    padding: 2rem 5%;
    background: white;
    text-align: center;
}

.page-btn {
    padding: 0.8rem 1.5rem;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 0 0.5rem;
}

.page-btn:hover {
    background: #5a6fd6;
}

.page-numbers {
    margin: 0 1rem;
}

.page-numbers a {
    display: inline-block;
    padding: 0.8rem 1.2rem;
    color: #667eea;
    text-decoration: none;
    border-radius: 5px;
    margin: 0 0.2rem;
    transition: all 0.3s ease;
}

.page-numbers a:hover {
    background: #f0f0f0;
}

.page-active {
    display: inline-block;
    padding: 0.8rem 1.2rem;
    background: #667eea;
    color: white;
    border-radius: 5px;
    margin: 0 0.2rem;
}

.page-dots {
    margin: 0 0.5rem;
    color: #999;
}

.about-content {
    padding: 4rem 5%;
    background: white;
}

.about-section {
    margin-bottom: 3rem;
}

.about-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #333;
}

.about-section p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.value-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
}

.value-emoji {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.value-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.value-card p {
    color: #666;
    font-size: 0.9rem;
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #667eea;
}

.timeline-item {
    position: relative;
    padding-bottom: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.4rem;
    top: 0;
    width: 16px;
    height: 16px;
    background: #667eea;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.2);
}

.timeline-year {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: #667eea;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 5px;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: #333;
}

.timeline-content p {
    color: #666;
    font-size: 0.95rem;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.team-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
}

.team-emoji {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.team-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.team-card p {
    color: #666;
    font-size: 0.9rem;
}

.awards-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.award-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.award-emoji {
    font-size: 2rem;
}

.award-info h4 {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 0.2rem;
}

.award-info p {
    color: #999;
    font-size: 0.9rem;
}

.contact-content {
    padding: 4rem 5%;
    background: white;
}

.contact-section {
    margin-bottom: 3rem;
}

.contact-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #333;
}

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

.contact-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
}

.contact-emoji {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-card h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.contact-card p {
    color: #666;
    margin-bottom: 0.3rem;
}

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

.office-item {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
}

.office-emoji {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.office-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.office-item p {
    color: #666;
    margin-bottom: 0.3rem;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
}

.submit-btn {
    width: 100%;
    padding: 1.2rem;
    font-size: 1.1rem;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
}

.faq-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.faq-item p {
    color: #666;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: #f8f9fa;
    color: #333;
    text-decoration: none;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: #667eea;
    color: white;
}

.social-emoji {
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    header {
        padding: 1rem 3%;
    }
    
    header nav {
        float: none;
        margin-top: 1rem;
    }
    
    header nav ul {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    header nav ul li {
        margin-left: 0;
    }
    
    .hero-content h2 {
        font-size: 1.8rem;
    }
    
    .feature-grid, .category-grid, .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .news-card.featured {
        grid-column: span 1;
    }
    
    .download-options, .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .timeline {
        padding-left: 1.5rem;
    }
    
    .timeline-item::before {
        left: -1.9rem;
    }
}