/* 全局样式 */
:root {
    --primary-color: #ff4757;
    --secondary-color: #ff6b81;
    --accent-color: #ff7f50;
    --dark-color: #2f3542;
    --light-color: #f1f2f6;
    --text-color: #333;
    --text-light: #777;
    --white: #fff;
    --border-radius: 8px;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f9f9f9;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-weight: 500;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* 头部样式 */
#header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo h1 {
    color: var(--primary-color);
    font-size: 28px;
    font-weight: 700;
}

#main-nav ul {
    display: flex;
    gap: 20px;
}

#main-nav ul li a {
    color: var(--dark-color);
    font-weight: 500;
    padding: 10px;
    transition: var(--transition);
}

#main-nav ul li a:hover {
    color: var(--primary-color);
}

/* 横幅样式 */
.banner {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.banner-content {
    max-width: 800px;
    margin: 0 auto;
}

.banner h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.banner p {
    font-size: 20px;
    margin-bottom: 30px;
}

.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
}

.search-box input {
    flex: 1;
    padding: 15px;
    border: none;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    font-size: 16px;
}

.search-box button {
    background-color: var(--dark-color);
    color: var(--white);
    border: none;
    padding: 0 30px;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    cursor: pointer;
    transition: var(--transition);
}

.search-box button:hover {
    background-color: #1e2a3a;
}

/* 分区样式 */
.section {
    padding: 80px 0;
}

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

.section-header h2 {
    font-size: 36px;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.section-header p {
    color: var(--text-light);
    font-size: 18px;
}

/* 卡片样式 */
.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 30px;
}

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

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.card-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.card-content p {
    color: var(--text-light);
    margin-bottom: 15px;
}

/* 文章样式 */
.articles-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    gap: 30px;
}

.article-item {
    background-color: var(--white);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.article-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.article-item p {
    color: var(--text-color);
    line-height: 1.8;
}

/* 页脚样式 */
#footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 60px 0 20px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-logo {
    flex: 0 0 100%;
    max-width: 300px;
    margin-bottom: 30px;
}

.footer-logo h3 {
    font-size: 24px;
    color: var(--white);
    margin-bottom: 10px;
}

.footer-links {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.footer-column {
    flex: 0 0 calc(25% - 20px);
    margin-bottom: 20px;
}

.footer-column h4 {
    color: var(--white);
    font-size: 18px;
    margin-bottom: 15px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-column ul li {
    margin-bottom: 8px;
}

.footer-column ul li a {
    color: var(--light-color);
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--light-color);
    font-size: 14px;
    margin-bottom: 10px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .footer-column {
        flex: 0 0 calc(50% - 20px);
    }
    
    .articles-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    #header .container {
        flex-direction: column;
    }
    
    .logo {
        margin-bottom: 15px;
    }
    
    #main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .banner h2 {
        font-size: 36px;
    }
    
    .banner p {
        font-size: 18px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-header h2 {
        font-size: 30px;
    }
}

@media (max-width: 576px) {
    .card-container {
        grid-template-columns: 1fr;
    }
    
    .footer-column {
        flex: 0 0 100%;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .search-box input {
        border-radius: var(--border-radius) var(--border-radius) 0 0;
        margin-bottom: 2px;
    }
    
    .search-box button {
        border-radius: 0 0 var(--border-radius) var(--border-radius);
        padding: 15px;
    }
}