body {
        margin: 0;
        font-family: "Microsoft YaHei", Arial, sans-serif;
        background: #0f1115;
        color: #e5e5e5;
        line-height: 1.6;
    }
    a {
        color: #4fc3f7;
        text-decoration: none;
    }
    .container {
        max-width: 1200px;
        margin: auto;
        padding: 20px;
    }
    /* 顶部导航 */
    header {
        background: #161a21;
        padding: 15px 0;
        position: sticky;
        top: 0;
        z-index: 999;
    }
    nav ul {
        display: flex;
        justify-content: center;
        list-style: none;
        padding: 0;
        margin: 0;
        flex-wrap: wrap;
    }
    nav ul li {
        margin: 0 15px;
    }
    nav ul li a {
        color: #e5e5e5;
        font-size: 15px;
    }
    nav ul li a:hover {
        color: #4fc3f7;
    }

    /* Banner */
    .banner {
        text-align: center;
        padding: 60px 20px;
        background: linear-gradient(160deg, #1c1f28, #0f1115);
    }
    .banner h1 {
        font-size: 36px;
        margin-bottom: 15px;
        color: #ffffff;
    }
    .banner p {
        font-size: 16px;
        color: #aaa;
    }

    /* 按钮 */
    .btn {
        display: inline-block;
        margin-top: 25px;
        padding: 14px 36px;
        background: linear-gradient(135deg, #4fc3f7, #0288d1);
        color: #fff;
        font-size: 16px;
        border-radius: 6px;
        cursor: pointer;
    }
    .btn:hover {
        opacity: 0.9;
    }

    /* 卡片 */
    .cards {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 20px;
        margin-top: 40px;
    }
    .card {
        background: #1c1f28;
        padding: 25px;
        border-radius: 10px;
        text-align: center;
    }
    .card h3 {
        margin-bottom: 10px;
        color: #4fc3f7;
    }

    /* 功能列表 */
    .features {
        margin-top: 50px;
    }
    .features ul {
        list-style: none;
        padding: 0;
    }
    .features ul li {
        padding: 10px 0;
        border-bottom: 1px solid #2a2f3a;
    }

    /* 教程 */
    .tutorial ol {
        padding-left: 20px;
    }
    .tutorial li {
        margin-bottom: 10px;
    }

    /* FAQ */
    .faq dt {
        font-weight: bold;
        margin-top: 15px;
    }
    .faq dd {
        margin-left: 0;
        color: #aaa;
    }

    /* 底部 */
    footer {
        background: #161a21;
        text-align: center;
        padding: 25px 15px;
        font-size: 13px;
        color: #666;
        margin-top: 60px;
    }

    /* 响应式 */
    @media (max-width: 600px) {
        .banner h1 {
            font-size: 26px;
        }
        nav ul li {
            margin: 5px 10px;
        }
    }