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

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

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

/* 导航栏 */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    z-index: 1000;
}

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

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

.logo-image {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: #3498db;
}

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

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

.nav-links a:hover {
    color: #3498db;
}

.mobile-menu {
    display: none;
}

.menu-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 15px;
    position: relative;
    z-index: 1001;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-width: 44px;
    min-height: 44px;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 4px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.menu-toggle:hover span {
    background-color: #3498db;
}

.menu-toggle:active span {
    background-color: #2980b9;
}

.menu-toggle:focus {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 英雄区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 40px;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

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

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn-primary {
    background-color: #fff;
    color: #3498db;
}

.btn-primary:hover {
    background-color: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

.btn-secondary:hover {
    background-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.hero-image {
    flex: 1;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* 功能特性 */
.features {
    padding: 80px 0;
    background-color: #fff;
}

.features h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

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

.feature-card {
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.feature-icon {
    margin-bottom: 20px;
    color: #3498db;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

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

/* 优势 */
.advantages {
    padding: 80px 0;
    background-color: #f5f5f5;
}

.advantages h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

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

.advantage-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.advantage-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

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

/* 价格 */
.pricing {
    padding: 80px 0;
    background-color: #fff;
}

.pricing h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.pricing-card.featured {
    background-color: #3498db;
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.pricing-card.featured .btn-primary {
    background-color: #fff;
    color: #3498db;
}

.pricing-card.featured .btn-primary:hover {
    background-color: #f8f9fa;
}

.badge {
    position: absolute;
    top: -10px;
    right: 30px;
    background-color: #ff6b6b;
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
}

.price {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 10px;
}

.duration {
    font-size: 16px;
    margin-bottom: 30px;
    opacity: 0.8;
}

.features-list {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.features-list li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

.features-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #27ae60;
    font-weight: bold;
}

.pricing-card.featured .features-list li:before {
    color: #fff;
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background-color: #f5f5f5;
}

.contact h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact-info p {
    margin-bottom: 30px;
    color: #666;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-item svg {
    color: #3498db;
}

.contact-image {
    text-align: center;
}

.superhero-image {
    width: 562px;
    height: 473px;
    border-radius: 10px;
    display: block;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* 下载 */
.download {
    padding: 80px 0 60px;
    background-color: #f8f9fa;
}

.download h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 50px;
    color: #333;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

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

.download-card {
    background-color: #fff;
    padding: 50px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    transition: all 0.3s ease;
}

.download-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.download-icon {
    color: #3498db;
    margin-bottom: 20px;
}

.download-icon svg {
    width: 64px;
    height: 64px;
}

.download-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.download-card .version {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}

.download-card .size {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}

.download-card .date {
    font-size: 14px;
    color: #666;
    margin-bottom: 25px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.download-btn svg {
    width: 20px;
    height: 20px;
}

.download-stats {
    background-color: #fff;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.download-stats h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 30px;
    color: #333;
    text-align: center;
}

.download-stats .stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.download-stats .stat-item {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}

.download-stats .stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.download-stats .stat-icon {
    color: #3498db;
    margin-bottom: 15px;
}

.download-stats .stat-icon svg {
    width: 32px;
    height: 32px;
}

.download-stats .stat-number {
    font-size: 36px;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

.download-stats .stat-label {
    font-size: 16px;
    color: #666;
}

/* 下载区域响应式设计 */
@media (max-width: 1024px) {
    .download-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .download-stats .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .download {
        padding: 60px 0 40px;
    }
    
    .download h2 {
        font-size: 28px;
    }
    
    .download-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .download-card {
        padding: 40px;
        max-width: 100%;
    }
    
    .download-stats .stats-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .download-stats h3 {
        font-size: 20px;
    }
    
    .download-stats .stat-number {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .download {
        padding: 60px 0 30px;
    }
    
    .download h2 {
        font-size: 24px;
    }
    
    .download-card {
        padding: 30px;
    }
    
    .download-card h3 {
        font-size: 20px;
    }
    
    .download-card .version,
    .download-card .size,
    .download-card .date {
        font-size: 13px;
    }
    
    .download-btn {
        padding: 12px 30px;
        font-size: 14px;
    }
    
    .download-stats {
        padding: 30px;
    }
    
    .download-stats h3 {
        font-size: 18px;
    }
    
    .download-stats .stat-number {
        font-size: 24px;
    }
    
    .download-stats .stat-label {
        font-size: 14px;
    }
}

/* 页脚 */
footer {
    background-color: #333;
    color: #fff;
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 30px;
}

.footer-info h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-info p {
    opacity: 0.8;
    max-width: 400px;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #3498db;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #fff;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        padding: 20px;
        flex-direction: column;
        gap: 15px;
        max-height: 80vh;
        overflow-y: auto;
    }

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

    .mobile-menu {
        display: block;
    }

    .navbar .container {
        padding: 10px 15px;
    }

    .logo-text {
        font-size: 20px;
    }

    .logo-image {
        width: 32px;
        height: 32px;
    }

    .nav-links a {
        font-size: 15px;
        padding: 10px 0;
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
    }

    .footer-links {
        flex-wrap: wrap;
    }

    .footer-links a {
        width: 100%;
        text-align: center;
        padding: 10px 0;
    }

    .footer-info {
        text-align: center;
    }
}

@media (max-width: 480px) {
    footer {
        padding: 20px 0;
    }

    .footer-info {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 28px;
    }

    .hero p {
        font-size: 16px;
    }

    .features h2,
    .advantages h2,
    .pricing h2,
    .contact h2 {
        font-size: 28px;
    }

    .feature-card,
    .advantage-item,
    .pricing-card,
    .contact-info,
    .contact-image {
        padding: 25px;
    }

    .superhero-image {
        width: 100%;
        height: auto;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
        width: 100%;
        text-align: center;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .hero-buttons .btn {
        width: 100%;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.advantage-item,
.pricing-card {
    animation: fadeIn 0.6s ease forwards;
}

.feature-card:nth-child(1) {
    animation-delay: 0.1s;
}

.feature-card:nth-child(2) {
    animation-delay: 0.2s;
}

.feature-card:nth-child(3) {
    animation-delay: 0.3s;
}

.feature-card:nth-child(4) {
    animation-delay: 0.4s;
}

.feature-card:nth-child(5) {
    animation-delay: 0.5s;
}

.feature-card:nth-child(6) {
    animation-delay: 0.6s;
}

.advantage-item:nth-child(1) {
    animation-delay: 0.1s;
}

.advantage-item:nth-child(2) {
    animation-delay: 0.2s;
}

.advantage-item:nth-child(3) {
    animation-delay: 0.3s;
}

.advantage-item:nth-child(4) {
    animation-delay: 0.4s;
}

.pricing-card:nth-child(1) {
    animation-delay: 0.1s;
}

.pricing-card:nth-child(2) {
    animation-delay: 0.2s;
}

.pricing-card:nth-child(3) {
    animation-delay: 0.3s;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.back-to-top:active {
    transform: translateY(-2px);
}

.back-to-top svg {
    transition: transform 0.3s ease;
}

.back-to-top:hover svg {
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .back-to-top {
        bottom: 15px;
        right: 15px;
        width: 40px;
        height: 40px;
    }

    .back-to-top svg {
        width: 20px;
        height: 20px;
    }
}