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

    body {
        font-family: 'Avenir', 'Helvetica Neue', Helvetica, Arial, sans-serif;
        background: linear-gradient(135deg, #1e3c72, #2a5298);
        color: #ffffff;
        line-height: 1.6;
        overflow-x: hidden;
    }

    a {
        color: #ff8c00;
        text-decoration: none;
        transition: color 0.3s ease;
    }

    a:hover {
        color: #ffd700;
    }

    header {
        padding: 20px;
        text-align: center;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(10px);
        position: fixed;
        width: 100%;
        top: 0;
        z-index: 1000;
    }

    header h1 {
        font-size: 2em;
        margin-bottom: 10px;
        color: #ffffff;
        text-shadow: 2px 2px 4px rgba(0,0,0,0.6);
    }

    header p {
        font-size: 1em;
        color: #dddddd;
    }

    main {
        padding: 100px 20px 50px 20px;
        max-width: 1200px;
        margin: 0 auto;
    }

    .section {
        margin-bottom: 50px;
        padding: 20px;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 15px;
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
        backdrop-filter: blur(10px);
    }

    .section h2 {
        font-size: 1.8em;
        margin-bottom: 15px;
        color: #ff8c00;
        border-bottom: 2px solid #ff8c00;
        display: inline-block;
        padding-bottom: 5px;
    }

    .section p, .section ul, .section table {
        margin-bottom: 15px;
        color: #ffffff;
    }

    .section ul {
        list-style: inside square;
    }

    .section pre {
        background: rgba(0, 0, 0, 0.7);
        padding: 10px;
        border-radius: 8px;
        overflow-x: auto;
        font-size: 0.9em;
    }

    .section code {
        background: rgba(255, 255, 255, 0.2);
        padding: 2px 4px;
        border-radius: 4px;
        font-family: 'Courier New', Courier, monospace;
        color: #ffeb3b;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 10px;
    }

    table, th, td {
        border: 1px solid #ffffff;
    }

    th, td {
        padding: 10px;
        text-align: left;
        color: #ffffff;
    }

    th {
        background: rgba(255, 140, 0, 0.7);
    }

    img {
        max-width: 100%;
        height: auto;
        border-radius: 10px;
        margin: 10px 0;
    }

    .image-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }

    .image-grid img {
        width: 100%;
        height: auto;
        border-radius: 8px;
        transition: transform 0.3s ease;
    }

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

    footer {
        text-align: center;
        padding: 20px;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(10px);
        color: #ffffff;
        position: fixed;
        width: 100%;
        bottom: 0;
    }

    .tooltip {
        position: relative;
        display: inline-block;
        cursor: pointer;
        color: #ff8c00;
    }

    .tooltip .tooltiptext {
        visibility: hidden;
        width: 200px;
        background-color: rgba(0,0,0,0.8);
        color: #fff;
        text-align: center;
        border-radius: 6px;
        padding: 10px;
        position: absolute;
        z-index: 1;
        bottom: 125%;
        left: 50%;
        margin-left: -100px;
        opacity: 0;
        transition: opacity 0.3s;
    }

    .tooltip:hover .tooltiptext {
        visibility: visible;
        opacity: 1;
    }

    /* 动画效果 */
    @keyframes aurora-move {
        0% {
            background-position: 0% 50%;
        }
        50% {
            background-position: 100% 50%;
        }
        100% {
            background-position: 0% 50%;
        }
    }

    .animated-background {
        background: radial-gradient(circle, rgba(255,87,34,0.7), transparent);
        animation: aurora-move 15s linear infinite;
    }

    /* 响应式设计 */
    @media (max-width: 1440px) {
        main {
            padding: 80px 15px 40px 15px;
        }

        header h1 {
            font-size: 1.8em;
        }

        .section h2 {
            font-size: 1.6em;
        }
    }

    @media (max-width: 1200px) {
        main {
            padding: 80px 10px 40px 10px;
        }

        header h1 {
            font-size: 1.6em;
        }

        .section h2 {
            font-size: 1.4em;
        }
    }

    @media (max-width: 1024px) {
        main {
            padding: 70px 10px 35px 10px;
        }

        header h1 {
            font-size: 1.4em;
        }

        .section h2 {
            font-size: 1.2em;
        }
    }

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

        .section h2 {
            font-size: 1.1em;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.2em;
        }

        .section h2 {
            font-size: 1em;
        }

        .image-grid {
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        }
    }

    @media (max-width: 320px) {
        header h1 {
            font-size: 1em;
        }

        .section h2 {
            font-size: 0.9em;
        }

        .image-grid {
            grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        }
    }