/* 重置样式 */
* {
    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: #f5f5f7;
}

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

/* 顶部导航 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: #000;
    text-decoration: none;
}

.logo-img {
    width: 32px;
    height: 32px;
    display: block;
}

.logo-text {
    font-weight: 600;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #007aff;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #007aff;
    transition: width 0.3s ease;
}

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

/* 19+购买入口横幅 */
.hero-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 20px;
    margin-top: 0;
}

.banner-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}

.banner-content {
    flex: 1;
    min-width: 300px;
    color: #fff;
}

.banner-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.banner-description {
    font-size: 18px;
    margin-bottom: 30px;
    line-height: 1.8;
    opacity: 0.95;
}

.btn-primary {
    display: inline-block;
    background-color: #fff;
    color: #667eea;
    border: none;
    padding: 15px 40px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.banner-image {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.banner-apple-img {
    max-width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
}

/* 账号购买入口 */
.products-section {
    padding: 80px 20px;
    background-color: #fff;
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 50px;
    color: #000;
}

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

.product-card {
    background-color: #f5f5f7;
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: #007aff;
}

.product-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.product-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #000;
}

.product-description {
    font-size: 16px;
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
}

.btn-product {
    display: inline-block;
    background-color: #007aff;
    color: #fff;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    text-decoration: none;
    text-align: center;
}

.btn-product:hover {
    background-color: #0051d5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

/* 账号说明 */
.info-section {
    padding: 80px 20px;
    background-color: #f5f5f7;
}

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

.info-card {
    background-color: #fff;
    border-radius: 16px;
    padding: 40px 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.info-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #000;
    border-bottom: 3px solid #007aff;
    padding-bottom: 10px;
}

.info-text {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
}

.info-list {
    list-style: none;
    padding: 0;
}

.info-list li {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.info-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #007aff;
    font-weight: bold;
    font-size: 18px;
}

.info-list li strong {
    color: #000;
    font-weight: 600;
}

/* 底部版权 */
.footer {
    background-color: #1d1d1f;
    color: #f5f5f7;
    padding: 40px 20px;
    text-align: center;
}

.copyright {
    font-size: 16px;
    margin-bottom: 10px;
}

.footer-text {
    font-size: 14px;
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        gap: 15px;
    }

    .nav-link {
        font-size: 14px;
    }

    .banner-title {
        font-size: 32px;
    }

    .banner-description {
        font-size: 16px;
    }

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

    .section-title {
        font-size: 28px;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .logo-text {
        font-size: 16px;
    }

    .nav-menu {
        gap: 10px;
    }

    .nav-link {
        font-size: 12px;
    }

    .banner-title {
        font-size: 24px;
    }

    .hero-banner {
        padding: 50px 20px;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}