/* 全局重置与基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Roboto', sans-serif;
            scroll-behavior: smooth;
        }

        /* 全局滚动条美化 */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }

        ::-webkit-scrollbar-thumb {
            background: #38bdf8;
            border-radius: 3px;
        }

        ::-webkit-scrollbar-track {
            background: #1e293b;
        }

        body {
            background: #0f172a;
            background-image:
                radial-gradient(circle at 15% 20%, rgba(56, 189, 248, 0.05) 0%, transparent 30%),
                radial-gradient(circle at 85% 80%, rgba(129, 140, 248, 0.05) 0%, transparent 30%);
            color: #e0e0e0;
            min-height: 100vh;
            line-height: 1.6;
        }

        /* 布局容器 */
        .container {
            display: flex;
            min-height: 100vh;
        }

        /* ==================== PC端左侧导航栏 ==================== */
        .sidebar {
            width: 260px;
            background: #1e293b;
            border-right: 1px solid #2d3748;
            padding: 30px 20px;
            position: fixed;
            left: 0;
            top: 0;
            height: 100vh;
            overflow-y: auto;
            z-index: 99;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        .sidebar-title {
            font-size: 20px;
            font-weight: 700;
            color: #38bdf8;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid #2d3748;
        }

        .nav-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .nav-item a {
            display: block;
            padding: 12px 15px;
            background: #27273a;
            border: 1px solid #363652;
            border-radius: 8px;
            color: #e0e0e0;
            text-decoration: none;
            font-size: 15px;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .nav-item a.active {
            background: #38bdf8;
            color: #0f172a;
            border-color: #38bdf8;
            font-weight: 500;
        }

        .nav-item a:hover {
            background: #38bdf8;
            color: #0f172a;
            border-color: #38bdf8;
            transform: translateX(4px);
        }

        .back-home {
            display: block;
            margin-top: 20px;
            padding: 12px 15px;
            background: linear-gradient(135deg, #1e293b, #0f172a);
            border: 1px solid #2d3748;
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 500;
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .back-home i {
            color: #38bdf8;
            margin-right: 8px;
        }

        .back-home:hover {
            background: linear-gradient(135deg, #2d3748, #1e293b);
            transform: translateY(-2px);
        }

        /* ==================== 主内容区域 ==================== */
        .main-content {
            flex: 1;
            margin-left: 260px;
            padding: 40px;
            max-width: 1400px;
        }

        .main-title {
            color: #e0e0e0;
            font-size: 28px;
            margin-bottom: 30px;
            font-weight: 700;
            border-left: 4px solid #38bdf8;
            padding-left: 15px;
            background: #1e293b;
            padding: 12px 20px;
            border-radius: 12px;
            border: 1px solid #2d3748;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        .point-title {
            color: #e0e0e0;
            font-size: 24px;
            margin: 0 0 20px;
            font-weight: 700;
            border-left: 4px solid #38bdf8;
            padding-left: 15px;
            background: #1e293b;
            padding: 10px 20px;
            border-radius: 12px;
            border: 1px solid #2d3748;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        /* 点位内容区域 - 默认隐藏 */
        .point-section {
            display: none;
        }

        /* 默认显示第一个点位 */
        .point-section:first-child {
            display: block;
        }

        p {
            font-size: 16px;
            color: #e0e0e0;
            margin-bottom: 15px;
            background-color: #1e293b;
            padding: 15px 20px;
            border-radius: 8px;
            border: 1px solid #2d3748;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .step-group {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .step-item {
            background: linear-gradient(135deg, #27273a, #1e293b);
            border-radius: 12px;
            padding: 22px;
            border: 1px solid #363652;
            transition: all 0.25s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .step-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            border-color: #475569;
        }

        .point-img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            border: 1px solid #2d3748;
            margin-bottom: 10px;
        }

        /* 上下组切换按钮样式 */
        .switch-btn-group {
            display: flex;
            justify-content: space-between;
            margin-top: 30px;
            gap: 20px;
        }

        .switch-btn {
            flex: 1;
            padding: 14px 20px;
            background: #27273a;
            border: 1px solid #363652;
            border-radius: 8px;
            color: #e0e0e0;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .switch-btn:hover:not(:disabled) {
            background: #38bdf8;
            color: #0f172a;
            border-color: #38bdf8;
            transform: translateY(-2px);
        }

        .switch-btn:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }

        /* ==================== 移动端响应式适配 ==================== */
        @media (max-width: 992px) {
            .container {
                flex-direction: column;
            }

            .sidebar {
                width: 100%;
                height: auto;
                position: relative;
                border-right: none;
                border-bottom: 1px solid #2d3748;
                padding: 20px;
            }

            .nav-list {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 8px;
            }

            .nav-item {
                flex: 1;
                min-width: 140px;
            }

            .nav-item a {
                text-align: center;
                padding: 10px;
                font-size: 14px;
            }

            .back-home {
                margin-top: 15px;
            }

            .main-content {
                margin-left: 0;
                padding: 20px;
            }
        }

        @media (max-width: 576px) {
            .nav-item {
                min-width: 120px;
            }

            .main-title {
                font-size: 24px;
            }

            .point-title {
                font-size: 20px;
            }

            p {
                font-size: 14px;
                padding: 12px 15px;
            }

            .step-item {
                padding: 15px;
            }

            .switch-btn-group {
                flex-direction: column;
                gap: 10px;
            }
        }