:root {
            --primary-color: #3498db;
            --secondary-color: #2980b9;
            --text-color: #333;
            --bg-color: #f5f5f5;
            --panel-bg: #fff;
            --border-color: #ddd;
            --correct-color: #e74c3c;
            --score-color: #e67e22;
            --button-bg: #3498db;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.7);
        }

        /* 主题样式 */
        .theme-default {
            --primary-color: #3498db;
            --secondary-color: #2980b9;
            --text-color: #333;
            --bg-color: #f5f5f5;
            --panel-bg: #fff;
            --border-color: #ddd;
            --correct-color: #e74c3c;
            --score-color: #e67e22;
            --button-bg: #3498db;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.7);
        }

        .theme-dark {
            --primary-color: #9b59b6;
            --secondary-color: #8e44ad;
            --text-color: #ecf0f1;
            --bg-color: #2c3e50;
            --panel-bg: #34495e;
            --border-color: #7f8c8d;
            --correct-color: #e74c3c;
            --score-color: #e67e22;
            --button-bg: #9b59b6;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.8);
        }

        .theme-ocean {
            --primary-color: #1abc9c;
            --secondary-color: #16a085;
            --text-color: #fff;
            --bg-color: #3498db;
            --panel-bg: #2980b9;
            --border-color: #2c3e50;
            --correct-color: #e74c3c;
            --score-color: #f39c12;
            --button-bg: #1abc9c;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.7);
        }

        .theme-sunset {
            --primary-color: #e74c3c;
            --secondary-color: #c0392b;
            --text-color: #fff;
            --bg-color: #f39c12;
            --panel-bg: #e67e22;
            --border-color: #d35400;
            --correct-color: #3498db;
            --score-color: #9b59b6;
            --button-bg: #e74c3c;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.7);
        }

        .theme-forest {
            --primary-color: #2ecc71;
            --secondary-color: #27ae60;
            --text-color: #fff;
            --bg-color: #16a085;
            --panel-bg: #1abc9c;
            --border-color: #27ae60;
            --correct-color: #e74c3c;
            --score-color: #f39c12;
            --button-bg: #2ecc71;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.7);
        }

        .theme-galaxy {
            --primary-color: #8e44ad;
            --secondary-color: #9b59b6;
            --text-color: #ecf0f1;
            --bg-color: #2c3e50;
            --panel-bg: #34495e;
            --border-color: #7f8c8d;
            --correct-color: #e74c3c;
            --score-color: #3498db;
            --button-bg: #8e44ad;
            --button-text: #fff;
            --pause-overlay: rgba(0, 0, 0, 0.8);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            transition: background-color 0.3s, color 0.3s;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-color);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 0;
            overflow: hidden;
        }

        .screen {
            width: 100%;
            height: 100vh;
            display: flex;
            flex-direction: column;
            padding: 20px;
            overflow-y: auto;
        }

        #main-menu {
            justify-content: flex-start;
        }

        #game-screen, #result-screen {
            display: none;
        }

        .container {
            width: 100%;
            max-width: 800px;
            margin: 0 auto;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        h1 {
            text-align: center;
            margin-bottom: 20px;
            color: var(--primary-color);
        }

        .game-mode-selector, .difficulty-selector, .game-options {
            background-color: var(--panel-bg);
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        .options-title {
            margin-bottom: 15px;
            font-size: 1.2rem;
            color: var(--primary-color);
        }

        .mode-options, .difficulty-options, .theme-options {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
        }

        .option-btn {
            padding: 10px 15px;
            border: none;
            border-radius: 5px;
            background-color: var(--button-bg);
            color: var(--button-text);
            cursor: pointer;
            font-weight: bold;
            transition: transform 0.2s, background-color 0.2s;
        }

        .option-btn:hover {
            transform: translateY(-2px);
            background-color: var(--secondary-color);
        }

        .option-btn.selected {
            background-color: var(--secondary-color);
            box-shadow: 0 0 0 2px var(--primary-color);
        }

        .custom-difficulty {
            display: flex;
            align-items: center;
            margin-top: 10px;
            justify-content: center;
        }

        .custom-difficulty input {
            width: 60px;
            padding: 5px;
            margin: 0 10px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            background-color: var(--panel-bg);
            color: var(--text-color);
        }

        .timer-option {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-top: 10px;
        }

        .timer-option input {
            width: 60px;
            padding: 5px;
            margin: 0 10px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            background-color: var(--panel-bg);
            color: var(--text-color);
        }

        .start-btn {
            display: block;
            width: 100%;
            padding: 15px;
            margin-top: 20px;
            background-color: var(--primary-color);
            color: var(--button-text);
            border: none;
            border-radius: 5px;
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.2s;
        }

        .start-btn:hover {
            background-color: var(--secondary-color);
        }

        .game-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }

        .game-title {
            font-size: 1.5rem;
            color: var(--primary-color);
        }

        .game-controls {
            display: flex;
            gap: 10px;
        }

        .control-btn {
            padding: 8px 12px;
            border: none;
            border-radius: 5px;
            background-color: var(--button-bg);
            color: var(--button-text);
            cursor: pointer;
            font-weight: bold;
        }

        .game-info {
            display: flex;
            justify-content: space-between;
            margin-bottom: 20px;
            background-color: var(--panel-bg);
            padding: 15px;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        .timer, .score, .mistakes {
            text-align: center;
        }

        .timer span, .score span, .mistakes span {
            display: block;
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--primary-color);
        }

        .game-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            width: 100%;
        }

        .single-panel, .double-panel {
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 100%;
        }

        .double-panel {
            flex-direction: row;
            justify-content: space-between;
            gap: 20px;
        }

        .panel-title {
            margin-bottom: 10px;
            font-size: 1.1rem;
            color: var(--primary-color);
            text-align: center;
        }

        .color-grid-container {
            width: 100%;
            display: flex;
            justify-content: center;
            margin-bottom: 20px;
        }

        .color-grid {
            display: grid;
            gap: 0;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            overflow: hidden;
            width: 100%;
            aspect-ratio: 1 / 1;
        }

        .double-panel .color-grid {
            width: 100%;
            max-width: calc(50% - 10px);
        }

        .color-cell {
            width: 100%;
            height: 100%;
            border: 1px solid var(--border-color);
            cursor: pointer;
            position: relative;
            transition: transform 0.1s;
        }

        .color-cell:hover {
            transform: scale(1.03);
        }

        .correct-marker {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 15px;
            height: 15px;
            background-color: var(--correct-color);
            border-radius: 50%;
        }

        .pause-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: var(--pause-overlay);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 100;
            display: none;
        }

        .pause-title {
            font-size: 2rem;
            color: #fff;
            margin-bottom: 30px;
        }

        .pause-buttons {
            display: flex;
            gap: 20px;
        }

        .pause-btn {
            padding: 12px 24px;
            border: none;
            border-radius: 5px;
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
        }

        .resume-btn {
            background-color: #2ecc71;
            color: white;
        }

        .quit-btn {
            background-color: #e74c3c;
            color: white;
        }

        .result-screen {
            width: 100%;
            max-width: 800px;
            margin: 0 auto;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .result-container {
            background-color: var(--panel-bg);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .result-title {
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: var(--primary-color);
        }

        .result-item {
            margin-bottom: 10px;
            display: flex;
            justify-content: space-between;
        }

        .result-value {
            font-weight: bold;
        }

        .total-score {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--score-color);
            margin: 20px 0;
        }

        .restart-btn {
            padding: 10px 20px;
            background-color: var(--primary-color);
            color: var(--button-text);
            border: none;
            border-radius: 5px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background-color 0.2s;
            margin-top: 20px;
            width: 100%;
        }

        .restart-btn:hover {
            background-color: var(--secondary-color);
        }

        @media (max-width: 600px) {
            .double-panel {
                flex-direction: column;
                gap: 20px;
            }
            
            .double-panel .color-grid {
                max-width: 100%;
            }
            
            .game-header {
                flex-direction: column;
                gap: 10px;
            }
            
            .game-controls {
                width: 100%;
                justify-content: space-between;
            }
            
            .control-btn {
                flex: 1;
                text-align: center;
            }
        }