/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --white: #fff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-gray);
}

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

/* 头部样式 */
header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
}

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

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary-color);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 8px 15px;
    border-radius: 4px;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: #2980b9;
    color: var(--white);
}

.mobile-nav-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-color);
}

/* 主要内容样式 */
main {
    padding: 40px 0;
}

.featured-posts {
    margin-bottom: 50px;
}

.featured-posts h2 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    color: var(--secondary-color);
    position: relative;
    padding-bottom: 10px;
}

.featured-posts h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
}

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

.post-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.post-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.post-content {
    padding: 20px;
}

.post-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.post-meta {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    font-size: 0.9rem;
    color: #777;
}

.post-meta span {
    margin-right: 15px;
    display: flex;
    align-items: center;
}

.post-meta i {
    margin-right: 5px;
}

.post-excerpt {
    margin-bottom: 20px;
    color: #555;
}

.read-more {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.read-more:hover {
    color: #2980b9;
}

/* 新建帖子页面样式 */
.post-form {
    background-color: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--secondary-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    min-height: 300px;
    resize: vertical;
}

.btn-submit {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-submit:hover {
    background-color: #2980b9;
}

/* 页脚样式 */
footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 30px 0;
    margin-top: 50px;
}

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

.social-links a {
    color: var(--white);
    font-size: 1.2rem;
    margin-left: 15px;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
    }

    .mobile-nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        width: 100%;
        margin-top: 20px;
        flex-direction: column;
    }

    .nav-links.active {
        display: flex;
    }

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

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

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

    .social-links a {
        margin: 0 10px;
    }

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

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

    .featured-posts h2 {
        font-size: 1.5rem;
    }

    .post-form {
        padding: 20px;
    }
}`}}}