* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #f5f7fa;
            color: #2c3e50;
            line-height: 1.6;
        }

        /* 页面容器 */
        .container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部导航栏 */
        .header {
            background-color: #ffffff;
            border-bottom: 1px solid #e1e8ed;
            padding: 0;
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 60px;
        }

        .logo {
            font-size: 20px;
            font-weight: 600;
            color: #1890ff;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .logo svg {
            width: 24px;
            height: 24px;
        }

        .nav {
            display: flex;
            gap: 24px;
        }

        .nav a {
            color: #595959;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
        }

        .nav a:hover {
            color: #1890ff;
        }

        /* 横幅区域 */
        .banner {
            background-color: #1890ff;
            color: #ffffff;
            padding: 40px 20px;
            text-align: center;
        }

        .banner h1 {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .banner p {
            font-size: 15px;
            opacity: 0.9;
        }

        /* 主内容区域 */
        .main {
            padding: 30px 0;
        }

        /* 题目列表容器 */
        .exercise-section {
            background-color: #ffffff;
            border: 1px solid #e8e8e8;
            margin-bottom: 24px;
        }

        .section-header {
            padding: 16px 20px;
            border-bottom: 1px solid #e8e8e8;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .section-header svg {
            width: 20px;
            height: 20px;
            color: #1890ff;
        }

        .section-header h2 {
            font-size: 16px;
            font-weight: 600;
            color: #262626;
        }

        /* 题目列表 */
        .exercise-list {
            list-style: none;
        }

        .exercise-item {
            display: flex;
            align-items: center;
            padding: 14px 20px;
            border-bottom: 1px solid #f0f0f0;
            transition: background-color 0.2s;
        }

        .exercise-item:last-child {
            border-bottom: none;
        }

        .exercise-item:hover {
            background-color: #fafafa;
        }

        /* 普通数字样式 */
        .exercise-number {
            font-size: 15px;
            font-weight: 500;
            color: #595959;
            min-width: 32px;
            margin-right: 16px;
        }

        .exercise-title {
            flex: 1;
            font-size: 14px;
            color: #262626;
        }

        .view-btn {
            display: inline-block;
            padding: 6px 14px;
            font-size: 13px;
            color: #1890ff;
            background-color: #e6f7ff;
            border: 1px solid #91d5ff;
            text-decoration: none;
            transition: all 0.2s;
        }

        .view-btn:hover {
            color: #ffffff;
            background-color: #1890ff;
            border-color: #1890ff;
        }

        /* 底部 */
        .footer {
            background-color: #ffffff;
            border-top: 1px solid #e8e8e8;
            padding: 24px 0;
            text-align: center;
        }

        .footer-text {
            font-size: 13px;
            color: #8c8c8c;
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .nav {
                display: none;
            }

            .banner h1 {
                font-size: 22px;
            }

            .exercise-item {
                padding: 12px 16px;
            }

            .exercise-title {
                font-size: 13px;
                margin-right: 10px;
            }

            .view-btn {
                padding: 5px 10px;
                font-size: 12px;
            }
        }

        @media (max-width: 480px) {
            .banner {
                padding: 30px 16px;
            }

            .banner h1 {
                font-size: 20px;
            }

            .exercise-item {
                flex-wrap: wrap;
            }

            .exercise-title {
                width: calc(100% - 48px);
                margin-bottom: 8px;
            }

            .view-btn {
                margin-left: 48px;
            }
        }