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

body {
    font-family: "Microsoft YaHei", "SimHei", sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 导航栏 */
header {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

nav {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

nav ul {
    display: flex;
    list-style: none;
    justify-content: center;
}

nav li {
    padding: 1rem;
}

nav a {
    color: #1e3c72;
    text-decoration: none;
    font-weight: bold;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

nav a:hover {
    background-color: #e8f0fe;
}

/* 主内容区 */
main {
    padding: 2rem 0;
}

section {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    margin-bottom: 2rem;
}

h2 {
    color: #1e3c72;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e8f0fe;
}

p {
    margin-bottom: 1rem;
}

/* 资源卡片 */
.resource-card {
    background-color: #f9f9f9;
    border-left: 4px solid #1e3c72;
    padding: 1.5rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.resource-card h3 {
    color: #2a5298;
    margin-bottom: 1rem;
}

.resource-card ul {
    margin-left: 1.5rem;
}

.resource-card a {
    color: #2a5298;
    text-decoration: none;
    transition: color 0.3s ease;
}

.resource-card a:hover {
    color: #1e3c72;
    text-decoration: underline;
}

/* 列表样式 */
ul {
    margin: 1rem 0 1rem 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* 页脚 */
footer {
    background-color: #1e3c72;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer a {
    color: #e8f0fe;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav li {
        padding: 0.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}