/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: #333;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #2c3e50;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #3498db;
}

.search-box {
    position: relative;
    width: 300px;
}

.search-box input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 20px;
    outline: none;
    font-size: 14px;
}

.search-box button {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
}

.profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

.profile-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

/* 主要内容区 */
main {
    padding: 30px 0;
    flex: 1;
}

/* 底部样式 */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 30px 0;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.footer-section {
    margin-bottom: 20px;
}

.footer-section h3 {
    margin-bottom: 15px;
    font-size: 18px;
    color: #ecf0f1;
}

.footer-links a {
    display: block;
    margin-bottom: 10px;
    color: #bdc3c7;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #ecf0f1;
}

.copyright {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #bdc3c7;
    font-size: 14px;
}

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

    .nav-links {
        order: 1;
        width: 100%;
        justify-content: center;
        margin-bottom: 10px;
    }

    .search-box {
        width: 100%;
        order: 2;
    }

    .profile {
        order: 3;
    }

    .article-list {
        grid-template-columns: 1fr;
    }

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

    .article-image {
        width: 100%;
        height: 200px;
    }

    .article-info {
        padding-left: 0;
        padding-top: 15px;
    }
}