:root {
            /* === 配色方案：Indigo Horizon === */
            --bg-body: #f5f7fa; /* 极淡的灰蓝背景 */
            --bg-sidebar: rgba(255, 255, 255, 0.75); /* 侧边栏玻璃底色 */
            --glass-border: 1px solid rgba(255, 255, 255, 0.5);
            
            /* 渐变主色 */
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
            --primary-shadow: rgba(99, 102, 241, 0.3);
            
            --text-main: #1e293b;
            --text-sub: #64748b;
            --card-bg: #ffffff;
            
            --font-stack: 'Inter', -apple-system, "Microsoft YaHei", sans-serif;
        }

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

        body {
            font-family: var(--font-stack);
            background-color: var(--bg-body);
            color: var(--text-main);
            height: 100vh;
            display: flex;
            overflow: hidden;
        }

        /* === 侧边栏 (Glassmorphism) === */
        aside {
            width: 280px;
            background: var(--bg-sidebar);
            backdrop-filter: blur(25px) saturate(180%);
            -webkit-backdrop-filter: blur(25px) saturate(180%);
            border-right: 1px solid rgba(0,0,0,0.05);
            padding: 25px 15px;
            display: flex;
            flex-direction: column;
            z-index: 20;
            box-shadow: 5px 0 25px rgba(0,0,0,0.02);
        }

        .logo-area {
            padding: 0 15px 25px 15px;
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 10px;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.5px;
        }

        .section-title {
            font-size: 11px;
            font-weight: 600;
            color: #94a3b8;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            padding: 15px 15px 8px;
            margin-top: 10px;
        }

        .nav-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 15px;
            margin-bottom: 4px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .nav-item i { width: 20px; text-align: center; margin-right: 8px; transition: color 0.2s; }

        .nav-item:hover {
            background: rgba(99, 102, 241, 0.08);
            color: #6366f1;
        }

        /* 选中状态：渐变背景 */
        .nav-item.active {
            background: var(--primary-gradient);
            color: white;
            box-shadow: 0 4px 12px var(--primary-shadow);
        }
        .nav-item.active i { color: white; }
        .nav-item.active .count-pill { 
            background: rgba(255,255,255,0.2); 
            color: white; 
        }

        .count-pill {
            font-size: 11px;
            background: #e2e8f0;
            padding: 2px 8px;
            border-radius: 12px;
            color: #64748b;
            transition: all 0.2s;
        }

        /* === 主区域 === */
        .main-wrapper {
            flex: 1;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        /* 顶部搜索栏 */
        header {
            height: 72px;
            padding: 0 30px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.03);
            z-index: 10;
        }

        h2 { font-size: 18px; font-weight: 600; color: var(--text-main); }

        .search-box {
            position: relative;
            width: 320px;
        }

        .search-box input {
            width: 100%;
            padding: 12px 15px 12px 42px;
            border-radius: 12px;
            border: 1px solid #e2e8f0;
            background: #ffffff;
            font-size: 14px;
            outline: none;
            box-shadow: 0 2px 5px rgba(0,0,0,0.02);
            transition: all 0.3s;
        }

        .search-box input:focus {
            border-color: #8b5cf6;
            box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
        }

        .search-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: #94a3b8;
            font-size: 14px;
        }

        /* 图标网格区域 */
        .content-area {
            flex: 1;
            padding: 30px;
            overflow-y: auto;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
            gap: 20px;
        }

        /* 现代化卡片设计 */
        .card {
            background: var(--card-bg);
            aspect-ratio: 1;
            border-radius: 16px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            border: 1px solid transparent;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
            transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
            position: relative;
            overflow: hidden;
        }

        .card:hover {
            transform: translateY(-5px) scale(1.02);
            box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.08);
            border-color: rgba(99, 102, 241, 0.2);
        }

        .card i {
            font-size: 32px;
            margin-bottom: 12px;
            background: var(--text-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent; /* 默认黑色 */
            transition: all 0.3s;
        }

        /* 悬停时图标变色 */
        .card:hover i {
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            transform: scale(1.1);
        }

        .card span {
            font-size: 12px;
            color: var(--text-sub);
            text-align: center;
            padding: 0 5px;
            width: 100%;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* 加载与状态 */
        .state-msg {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100%;
            color: #94a3b8;
        }
        .state-msg i { font-size: 40px; margin-bottom: 15px; opacity: 0.5; }

        /* Toast 提示 */
        .toast {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: white;
            padding: 15px 25px;
            border-radius: 12px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            gap: 12px;
            transform: translateY(100px);
            opacity: 0;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            z-index: 100;
            border-left: 5px solid #6366f1;
            font-weight: 500;
            font-size: 14px;
        }
        .toast.show { transform: translateY(0); opacity: 1; }
        .toast i { color: #6366f1; font-size: 18px; }

        /* 滚动条美化 */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 10px; }
        ::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.2); }