/* 基础样式 */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    
    body {
        font-family: 'Nunito', sans-serif;
        background: linear-gradient(to bottom, #003f7c, #87ceeb); /* 深蓝到浅蓝渐变 */
        color: #ffffff;
        line-height: 1.6;
        padding: 20px;
    }
    
    h1, h2, h3, h4, h5, h6 {
        font-family: 'Roboto', sans-serif;
        color: #ffffff;
        margin-bottom: 20px;
    }
    
    p {
        margin-bottom: 15px;
    }
    
    a {
        color: #ff9900;
        text-decoration: none;
    }
    
    a:hover {
        color: #e68a00;
    }
    
    /* 容器布局 */
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 20px;
    }
    
    /* 头部样式 */
    header {
        text-align: center;
        padding: 50px 0;
        background: radial-gradient(circle, rgba(0,63,124,0.8), transparent);
        position: relative;
    }
    
    header h1 {
        font-size: 3em;
        margin-bottom: 10px;
    }
    
    header p {
        font-size: 1.2em;
    }
    
    /* 导航样式 */
    nav {
        display: flex;
        justify-content: center;
        margin-top: 20px;
    }
    
    nav a {
        margin: 0 15px;
        font-size: 1em;
        position: relative;
    }
    
    nav a::after {
        content: '';
        display: block;
        width: 0;
        height: 2px;
        background: #ff9900;
        transition: width 0.3s;
        position: absolute;
        bottom: -5px;
        left: 0;
    }
    
    nav a:hover::after {
        width: 100%;
    }
    
    /* 主内容样式 */
    main {
        margin: 50px 0;
    }
    
    article {
        background: rgba(255, 255, 255, 0.1);
        padding: 30px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    }
    
    article h2 {
        font-size: 2em;
        margin-bottom: 20px;
    }
    
    article h3 {
        font-size: 1.5em;
        margin-top: 30px;
        margin-bottom: 15px;
    }
    
    article h4 {
        font-size: 1.2em;
        margin-top: 20px;
        margin-bottom: 10px;
    }
    
    article pre {
        background: #2d2d2d;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        margin-bottom: 20px;
    }
    
    article code {
        color: #ff9900;
        font-family: 'Courier New', Courier, monospace;
    }
    
    article ul {
        list-style: disc inside;
        margin-bottom: 20px;
    }
    
    /* 卡片式设计 */
    .card-container {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-around;
        margin-top: 40px;
    }
    
    .card {
        background: rgba(255, 255, 255, 0.1);
        width: 250px;
        height: 300px;
        margin: 20px;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        transition: transform 0.3s ease-in-out;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }
    
    .card:hover {
        transform: scale(1.1);
    }
    
    .card img {
        width: 100px;
        height: 100px;
        object-fit: cover;
        margin-bottom: 15px;
    }
    
    .card p {
        text-align: center;
    }
    
    /* 按钮样式 */
    .button-primary {
        background-color: #ff9900;
        color: #fff;
        border: none;
        padding: 10px 20px;
        font-size: 16px;
        cursor: pointer;
        border-radius: 5px;
        transition: background-color 0.3s ease;
        position: relative;
        overflow: hidden;
    }
    
    .button-primary:hover {
        background-color: #e68a00;
    }
    
    .button-primary::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 0;
        height: 0;
        background: rgba(255, 255, 255, 0.3);
        border-radius: 50%;
        transform: translate(-50%, -50%);
        transition: width 0.3s ease, height 0.3s ease, opacity 0.3s ease;
    }
    
    .button-primary:hover::before {
        width: 200px;
        height: 200px;
        opacity: 1;
    }
    
    /* 图标样式 */
    .icon {
        width: 24px;
        height: 24px;
        fill: #ff9900;
        margin-right: 8px;
    }
    
    /* 背景动画 */
    @keyframes aurora-move {
        0% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
        100% { background-position: 0% 50%; }
    }
    
    body {
        background: radial-gradient(circle, rgb(0,63,124), transparent);
        animation: aurora-move 15s linear infinite;
    }
    
    /* 响应式设计 */
    @media (max-width: 320px) {
        header h1 {
            font-size: 2em;
        }
        
        nav a {
            margin: 0 5px;
            font-size: 0.9em;
        }
        
        .card {
            width: 200px;
            height: 250px;
        }
    }
    
    @media (max-width: 480px) {
        header h1 {
            font-size: 2.5em;
        }
        
        nav {
            flex-direction: column;
        }
        
        nav a {
            margin: 10px 0;
        }
        
        .card {
            width: 220px;
            height: 270px;
        }
    }
    
    @media (max-width: 768px) {
        .container {
            padding: 15px;
        }
        
        .card-container {
            justify-content: center;
        }
    }
    
    @media (max-width: 1024px) {
        header {
            padding: 40px 0;
        }
        
        main {
            margin: 40px 0;
        }
        
        .card {
            width: 230px;
            height: 280px;
        }
    }
    
    @media (max-width: 1200px) {
        .container {
            max-width: 1000px;
        }
        
        .card {
            width: 240px;
            height: 290px;
        }
    }
    
    @media (min-width: 1440px) {
        header h1 {
            font-size: 3.5em;
        }
        
        .card {
            width: 260px;
            height: 310px;
        }
    }
    
    /* 提示信息 */
    .reference-note {
        text-align: center;
        font-size: 1em;
        margin-top: 30px;
        color: #ffcc00;
    }
    
    /* 图片样式 */
    .decorative-images {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 30px;
    }
    
    .decorative-images img {
        width: 100px;
        height: 100px;
        object-fit: cover;
        margin: 10px;
    }