/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 全局字体与颜色 */
body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
    color: #ffffff;
    line-height: 1.6;
    padding: 20px;
}

/* 顶部导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

header .logo {
    font-size: 1.5em;
    font-weight: bold;
    color: #00ff99;
}

nav a {
    color: #ffffff;
    text-decoration: none;
    margin-left: 20px;
    position: relative;
}

nav a::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: #00ff99;
    transition: width 0.3s;
    position: absolute;
    bottom: -5px;
    left: 0;
}

nav a:hover::after {
    width: 100%;
}

/* 主内容区 */
main {
    margin-top: 80px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding: 20px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 10px;
}

/* 标题样式 */
h2, h3, h4 {
    color: #00ff99;
    margin-bottom: 15px;
}

h2 {
    font-size: 2em;
    margin-top: 20px;
}

h3 {
    font-size: 1.5em;
    margin-top: 20px;
}

h4 {
    font-size: 1.2em;
    margin-top: 15px;
}

/* 段落与列表 */
p {
    margin-bottom: 15px;
    color: #cccccc;
}

ul {
    list-style-type: disc;
    margin-left: 20px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 10px;
}

/* 代码块样式 */
pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 15px;
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: #f8f8f2;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
}

th, td {
    border: 1px solid #444;
    padding: 10px;
    text-align: left;
}

th {
    background: #00ff99;
    color: #000;
}

/* 图片与容器 */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 15px;
    margin-top: 20px;
    margin-bottom: 20px;
}

.container img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

/* 参考提示 */
.reference-note {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px;
    border-left: 4px solid #00ff99;
    margin-bottom: 20px;
    border-radius: 5px;
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: #ffffff;
    border-radius: 10px;
    margin-top: 20px;
}

/* 响应式设计 */
@media (max-width: 1440px) {
    main {
        padding: 15px;
    }
}

@media (max-width: 1200px) {
    header {
        padding: 10px 20px;
    }

    nav a {
        margin-left: 15px;
    }
}

@media (max-width: 1024px) {
    h2 {
        font-size: 1.8em;
    }

    h3 {
        font-size: 1.4em;
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

    header .logo {
        font-size: 1.3em;
    }

    nav a {
        margin-left: 10px;
        font-size: 0.9em;
    }
}

@media (max-width: 480px) {
    h2 {
        font-size: 1.5em;
    }

    h3 {
        font-size: 1.2em;
    }

    nav a {
        margin-left: 8px;
        font-size: 0.8em;
    }
}

@media (max-width: 320px) {
    h2 {
        font-size: 1.3em;
    }

    h3 {
        font-size: 1em;
    }

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