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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* 导航栏样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
}

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

.nav-links li {
    margin-left: 2rem;
}

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

.nav-links a:hover {
    color: #007bff;
}

/* 主要内容区域 */
main {
    margin-top: 80px;
    padding: 2rem 5%;
}

/* 英雄区域 */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    margin: -2rem -5% 2rem -5%;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

/* 特性区域 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 4rem 0;
}

.feature {
    padding: 2rem;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

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

.feature h3 {
    color: #007bff;
    margin-bottom: 1rem;
}

/* 关于我们区域 */
.about {
    padding: 4rem 0;
    background: #f8f9fa;
    margin: 4rem -5%;
    padding: 4rem 5%;
}

.about h2 {
    text-align: center;
    margin-bottom: 2rem;
}

/* 联系我们区域 */
.contact {
    padding: 4rem 0;
}

.contact h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.contact-info {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

/* 服务条款页面样式 */
.agreement {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.agreement h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
}

.agreement-content p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

/* Terms of Use 页面样式 */
.terms {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.terms h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
    font-size: 2rem;
}

.terms h2 {
    color: #2c3e50;
    margin: 2rem 0 1rem 0;
    font-size: 1.5rem;
    padding-bottom: 0.5rem;
}

.terms h3 {
    color: #34495e;
    margin: 1.5rem 0 1rem 0;
    font-size: 1.2rem;
}

.terms-content {
    line-height: 1.8;
}

.terms-content p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.terms-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.terms-content li {
    margin-bottom: 1rem;
    text-align: justify;
}

.terms-content strong {
    color: #e74c3c;
    font-weight: 600;
}

/* 页脚样式 */
footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* 语言切换按钮样式 */
.lang-switch {
    margin-left: 2rem;
}

.lang-btn {
    background: none;
    border: 1px solid #007bff;
    color: #007bff;
    padding: 0.3rem 0.8rem;
    margin: 0 0.2rem;
    border-radius: 4px;
    height: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: #007bff;
    color: #fff;
}

.lang-btn.active {
    background: #007bff;
    color: #fff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .agreement {
        padding: 1rem;
    }
    
    .lang-switch {
        margin: 1rem 0;
        text-align: center;
    }
}

/* 页脚链接样式增强 */
.footer-links {
    margin-bottom: 0.5rem;
}
.footer-links a {
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color 0.3s;
}
.footer-links a:hover,
.footer-links a:focus,
.footer-links a:active {
    color: #ff9800;
    text-decoration: underline;
}