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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

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

/* 导航栏 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo {
    height: 40px;
    width: auto;
}

.brand-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c5aa0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

.nav-menu a:hover {
    color: #2c5aa0;
}

/* 主页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    margin-top: 70px;
}

.hero .container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.hero-content-center {
    text-align: center;
    max-width: 600px;
}

.hero-content-center h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hero-content-center h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-content-center p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    opacity: 0.8;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: #fff;
    color: #2c5aa0;
}

.btn-primary:hover {
    background: transparent;
    color: #fff;
    border-color: #fff;
}

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

.btn-secondary:hover {
    background: #fff;
    color: #2c5aa0;
}



/* 功能特色 */
.features {
    padding: 80px 0;
    background: #f8f9fa;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c5aa0;
}

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

.feature-item {
    background: #fff;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon img {
    width: 40px;
    height: 40px;
    filter: brightness(0) invert(1);
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2c5aa0;
}

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

/* 产品优势 */
.advantages {
    padding: 80px 0;
    background: #fff;
}

.advantages h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c5aa0;
}

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

.advantage-item {
    text-align: center;
    padding: 2rem;
}

.advantage-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #2c5aa0;
}

.advantage-item p {
    color: #666;
    font-size: 1.1rem;
}

/* 下载区域 */
.download {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

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

.download p {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

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

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.2rem 2.5rem;
    border-radius: 12px;
    text-decoration: none;
    color: white;
    font-weight: 600;
    transition: all 0.3s ease;
    min-width: 160px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.android-btn {
    background: linear-gradient(135deg, #34A853 0%, #0F9D58 100%);
}

.android-btn:hover {
    background: linear-gradient(135deg, #0F9D58 0%, #34A853 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 168, 83, 0.4);
}

.ios-btn {
    background: linear-gradient(135deg, #007AFF 0%, #0051D5 100%);
}

.ios-btn:hover {
    background: linear-gradient(135deg, #0051D5 0%, #007AFF 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
}

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

.btn-title {
    font-size: 1.2rem;
    font-weight: bold;
    line-height: 1.2;
}

.btn-subtitle {
    font-size: 0.9rem;
    opacity: 0.9;
    line-height: 1.2;
}

/* 关于我们 */
.about {
    padding: 80px 0;
    background: #f8f9fa;
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c5aa0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

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

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

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c5aa0;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

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

.contact-item h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2c5aa0;
}

.contact-item p {
    color: #666;
    font-size: 1.1rem;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 60px 0 20px;
}

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

.footer-section h3 {
    margin-bottom: 1rem;
    color: #fff;
}

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

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

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 2rem;
    text-align: center;
    color: #bdc3c7;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content-center h1 {
        font-size: 2.5rem;
    }
    
    .hero-content-center h2 {
        font-size: 1.4rem;
    }
    
    .hero-content-center p {
        font-size: 1.1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .download-btn {
        min-width: 180px;
        padding: 1rem 2rem;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-content-center h1 {
        font-size: 2rem;
    }
    
    .hero-content-center h2 {
        font-size: 1.2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features,
    .advantages,
    .download,
    .about,
    .contact {
        padding: 60px 0;
    }
    
    .features h2,
    .advantages h2,
    .download h2,
    .about h2,
    .contact h2 {
        font-size: 2rem;
    }
}