:root {
            --primary-color: #4a6bdf;
            --secondary-color: #f8f9fa;
            --text-color: #333;
            --border-color: #ddd;
            --shadow-color: rgba(0, 0, 0, 0.1);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            color: var(--text-color);
            line-height: 1.6;
            background-color: #f5f7fa;
            display: flex;
            min-height: 100vh;
        }
        /* 侧边栏样式 */
        .sidebar {
            width: 280px;
            background-color: white;
            box-shadow: 2px 0 10px var(--shadow-color);
            padding: 20px;
            transition: transform 0.3s ease;
            overflow-y: auto;
            height: 100vh;
            position: sticky;
            top: 0;
        }
        .sidebar-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }
        .sidebar-title {
            font-size: 1.2rem;
            font-weight: bold;
            color: var(--primary-color);
        }
        .formula-list {
            list-style: none;
        }
        .formula-item {
            padding: 10px;
            margin-bottom: 8px;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.2s;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .formula-item:hover {
            background-color: var(--secondary-color);
        }
        .formula-item.active {
            background-color: var(--primary-color);
            color: white;
        }
        .formula-actions {
            display: flex;
            gap: 5px;
        }
        .formula-btn {
            background: none;
            border: none;
            cursor: pointer;
            color: inherit;
            font-size: 0.8rem;
            opacity: 0.7;
        }
        .formula-btn:hover {
            opacity: 1;
        }
        .add-formula-btn {
            width: 100%;
            padding: 10px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            margin-top: 10px;
            font-weight: bold;
        }
        .add-formula-btn:hover {
            background-color: #3a5bd9;
        }
        /* 主内容区样式 */
        .main-content {
            flex: 1;
            padding: 30px;
            max-width: 800px;
            margin: 0 auto;
        }
        .header {
            margin-bottom: 30px;
            text-align: center;
        }
        .header h1 {
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .header p {
            color: #666;
        }
        /* 公式编辑器样式 */
        .formula-editor {
            background-color: white;
            border-radius: 8px;
            padding: 25px;
            box-shadow: 0 2px 10px var(--shadow-color);
            margin-bottom: 30px;
        }
        .formula-name {
            width: 100%;
            padding: 10px;
            margin-bottom: 20px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: 1rem;
        }
        .formula-preview {
            background-color: var(--secondary-color);
            padding: 15px;
            border-radius: 5px;
            margin-bottom: 20px;
            min-height: 100px;
            border: 1px dashed var(--border-color);
        }
        .formula-builder {
            margin-bottom: 20px;
        }
        .segment {
            display: flex;
            margin-bottom: 10px;
            align-items: center;
        }
        .segment-type {
            padding: 8px 12px;
            margin-right: 10px;
            border-radius: 5px;
            font-size: 0.8rem;
            font-weight: bold;
            background-color: #e9ecef;
            color: #495057;
        }
        .segment-type.fixed {
            background-color: #d4edda;
            color: #155724;
        }
        .segment-type.variable {
            background-color: #cce5ff;
            color: #004085;
        }
        .segment-input {
            flex: 1;
            padding: 8px 12px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
        }
        .segment-actions {
            margin-left: 10px;
            display: flex;
            gap: 5px;
        }
        .segment-btn {
            background: none;
            border: none;
            cursor: pointer;
            color: #6c757d;
            font-size: 0.9rem;
        }
        .segment-btn:hover {
            color: var(--primary-color);
        }
        .add-segment-btns {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }
        .add-segment-btn {
            padding: 8px 15px;
            background-color: #e9ecef;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            font-size: 0.9rem;
        }
        .add-segment-btn:hover {
            background-color: #dee2e6;
        }
        .save-formula-btn {
            padding: 10px 20px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            margin-right: 10px;
        }
        .save-formula-btn:hover {
            background-color: #3a5bd9;
        }
        .delete-formula-btn {
            padding: 10px 20px;
            background-color: #dc3545;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
        }
        .delete-formula-btn:hover {
            background-color: #c82333;
        }
        /* 公式使用区样式 */
        .formula-usage {
            background-color: white;
            border-radius: 8px;
            padding: 25px;
            box-shadow: 0 2px 10px var(--shadow-color);
        }
        .variable-inputs {
            margin-bottom: 20px;
        }
        .variable-input {
            margin-bottom: 15px;
        }
        .variable-input label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
            color: #495057;
        }
        .variable-input input {
            width: 100%;
            padding: 10px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: 1rem;
        }
        .result {
            margin-top: 20px;
        }
        .result-label {
            font-weight: bold;
            margin-bottom: 10px;
            display: block;
            color: #495057;
        }
        .result-content {
            background-color: var(--secondary-color);
            padding: 15px;
            border-radius: 5px;
            min-height: 100px;
            border: 1px solid var(--border-color);
        }
        .copy-btn {
            padding: 10px 20px;
            background-color: #28a745;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            margin-top: 15px;
        }
        .copy-btn:hover {
            background-color: #218838;
        }
        /* 移动设备样式 */
        .mobile-menu-btn {
            display: none;
            position: fixed;
            top: 10px;
            left: 10px;
            z-index: 1000;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 5px;
            padding: 10px;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .sidebar {
                position: fixed;
                top: 0;
                left: 0;
                height: 100vh;
                z-index: 999;
                transform: translateX(-100%);
            }
            .sidebar.show {
                transform: translateX(0);
            }
            .main-content {
                padding: 20px;
                margin-top: 60px;
            }
            .mobile-menu-btn {
                display: block;
            }
        }