/* 基础样式与全局设置 */
:root {
    --primary-color: #007BFF;
    --secondary-color: #1E90FF;
    --highlight-color: #FFA500;
    --bg-gradient: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    --font-family: 'Roboto', sans-serif;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: var(--font-family);
    background: var(--bg-gradient);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}
header {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px 10px;
    position: sticky;
    top: 0;
    z-index: 1000;
}
header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}
nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 20px;
}
nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.module {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s ease-in-out;
}
.module:hover {
    transform: translateY(-5px);
}
h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
}
p {
    margin-bottom: 10px;
}
code {
    background: #f4f4f4;
    padding: 5px 10px;
    border-radius: 5px;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}
pre code {
    display: block;
    overflow-x: auto;
    padding: 15px;
    background: #2d2d2d;
    color: #ccc;
    border-radius: 5px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}
th {
    background: var(--primary-color);
    color: white;
}
footer {
    background: var(--primary-color);
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    nav ul {
        flex-direction: column;
        gap: 10px;
    }
    .container {
        grid-template-columns: 1fr;
    }
    pre code {
        font-size: 0.9rem;
    }
}
@media (min-width: 1024px) {
    main {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .module {
        flex: 1 1 calc(50% - 20px);
    }
}