* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

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

/* 导航栏样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #3a7bd5, #00d2ff);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    margin-right: 10px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #2c3e50;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #3a7bd5;
}

/* 主内容区样式 */
.hero {
    padding: 150px 0 80px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    text-align: center;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 20px;
    color: #2c3e50;
}

.hero p {
    font-size: 18px;
    color: #555;
    max-width: 700px;
    margin: 0 auto 30px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 30px;
    background-color: #3a7bd5;
    color: white;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(58, 123, 213, 0.3);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(58, 123, 213, 0.4);
}

.btn i {
    margin-right: 10px;
    font-size: 20px;
}

.btn-apple {
    background-color: #000;
}

.btn-android {
    background-color: #3ddc84;
}

/* 特性介绍样式 */
.features {
    padding: 80px 0;
    background-color: #fff;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 36px;
    color: #2c3e50;
    margin-bottom: 15px;
}

.section-title p {
    color: #777;
    max-width: 600px;
    margin: 0 auto;
}

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

.feature-card {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
}

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

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #3a7bd5, #00d2ff);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 30px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: #2c3e50;
}

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

/* 安全提示样式 */
.security {
    padding: 80px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

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

.security-text {
    flex: 1;
    padding-right: 50px;
}

.security-image {
    flex: 1;
    text-align: center;
}

.security-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* 常见问题样式 */
.faq {
    padding: 80px 0;
    background-color: #fff;
}

.faq-item {
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

.faq-question {
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    margin-top: 10px;
    color: #666;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 50px 0 20px;
}

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

.footer-column {
    flex: 1;
    min-width: 200px;
    margin-bottom: 30px;
}

.footer-column h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

.footer-column ul li {
    margin-bottom: 10px;
}

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

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

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 15px 0;
    }

    .nav-links {
        margin-top: 15px;
    }

    .nav-links li {
        margin: 0 10px;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 250px;
        justify-content: center;
    }

    .security-content {
        flex-direction: column;
    }

    .security-text {
        padding-right: 0;
        margin-bottom: 30px;
    }

    .footer-content {
        flex-direction: column;
    }
}