* {
    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: #f9f9f9;
}

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

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

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

.logo h1 {
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: opacity 0.3s;
}

.nav-menu a:hover {
    opacity: 0.8;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0;
    text-align: center;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
    opacity: 0.85;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary {
    background: white;
    color: #667eea;
}

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

/* 通用区块样式 */
.section {
    padding: 80px 0;
}

.alt-bg {
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 1rem auto 0;
    border-radius: 2px;
}

/* 关于我们 */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.about-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    text-align: center;
    transition: transform 0.3s;
}

.about-card:hover {
    transform: translateY(-5px);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

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

.about-card p {
    color: #666;
    line-height: 1.8;
}

/* 功能特色 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-item {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    transition: transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-3px);
}

.feature-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.feature-item p {
    opacity: 0.9;
    font-size: 0.95rem;
}

/* APP介绍 */
.app-intro {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    max-width: 800px;
    margin: 0 auto;
}

.app-text p {
    margin-bottom: 1rem;
    color: #555;
    line-height: 1.8;
}

.app-text ul {
    list-style: none;
    padding-left: 0;
}

.app-text li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: #555;
}

.app-text li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.app-download {
    text-align: center;
    margin-top: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    color: white;
}

.app-download p {
    font-size: 1.2rem;
    font-weight: 600;
}

/* 联系我们 */
.contact-content {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    max-width: 600px;
    margin: 0 auto;
}

.contact-item {
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

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

.contact-label {
    font-weight: 600;
    color: #667eea;
    margin-right: 0.5rem;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-content p {
    margin: 0.3rem 0;
    font-size: 0.9rem;
    color: #ccc;
}

.footer-link {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-link:hover {
    color: #fff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-content,
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 80px 0;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

    .section {
        padding: 60px 0;
    }
}