/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 页眉样式 */
.header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.logo h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

/* 导航栏样式 */
.navbar {
    display: flex;
    justify-content: center;
}

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

.nav-links li {
    margin: 0 1rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
}

.nav-links a i {
    margin-right: 0.5rem;
}

.nav-links a:hover, .nav-links a.active {
    background-color: #34495e;
    transform: translateY(-2px);
}

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 主内容区基础样式 */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* 页脚样式 */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.footer-section h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
    display: inline-block;
}

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

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

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

.footer-section a:hover {
    color: #3498db;
    margin-left: 5px;
}

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

/* 响应式基础样式 */
@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 70px;
        right: -100%;
        flex-direction: column;
        background-color: #2c3e50;
        width: 50%;
        height: calc(100vh - 70px);
        transition: right 0.3s ease;
        padding: 2rem;
    }

    .nav-links.show {
        right: 0;
    }

    .nav-links li {
        margin: 1rem 0;
    }

    .hamburger {
        display: block;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.5rem;
    }

    .nav-links {
        width: 100%;
    }
}