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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            overflow: hidden;
        }

        .container {
            display: flex;
            height: 100vh;
            position: relative;
        }

        /* 侧边栏样式 */
        .sidebar {
            width: 280px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 0 20px 20px 0;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            padding: 30px 20px;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 10;
            position: relative;
        }

        .sidebar.collapsed {
            width: 70px;
            padding: 30px 15px;
        }

        .sidebar-header {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
        }

        .logo {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, #ff6b6b, #ee5a24);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-size: 24px;
            color: white;
            font-weight: bold;
            box-shadow: 0 5px 15px rgba(255, 107, 107, 0.4);
        }

        #title {
            font-size: 24px;
            font-weight: 700;
            color: #2c3e50;
            margin-bottom: 5px;
            transition: opacity 0.3s ease;
        }

        .sidebar.collapsed #title {
            opacity: 0;
        }

        #expand, #select {
            font-size: 12px;
            color: #7f8c8d;
            transition: opacity 0.3s ease;
        }

        .sidebar.collapsed #expand,
        .sidebar.collapsed #select {
            opacity: 0;
        }

        /* 切换按钮 */
        .toggle-btn {
            position: absolute;
            top: 20px;
            right: -15px;
            width: 30px;
            height: 30px;
            background: white;
            border: none;
            border-radius: 50%;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: #667eea;
            transition: all 0.3s ease;
        }

        .toggle-btn:hover {
            transform: scale(1.1);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }

        /* 导航菜单 */
        #nav {
            list-style: none;
        }

        #nav li {
            margin-bottom: 8px;
        }

        #nav a {
            display: flex;
            align-items: center;
            padding: 12px 15px;
            color: #5a6c8a;
            text-decoration: none;
            border-radius: 12px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            font-weight: 500;
            position: relative;
            overflow: hidden;
        }

        #nav a::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 0;
            height: 100%;
            background: linear-gradient(135deg, #667eea, #764ba2);
            transition: width 0.3s ease;
            z-index: -1;
        }

        #nav a:hover::before {
            width: 100%;
        }

        #nav a:hover {
            color: white;
            transform: translateX(5px);
        }

        #nav a.selected {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
            transform: translateX(5px);
        }

        #nav a.selected::before {
            width: 100%;
        }

        .game-icon {
            width: 20px;
            height: 20px;
            margin-right: 12px;
            font-size: 16px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .sidebar.collapsed .game-icon {
            margin-right: 0;
        }

        .game-text {
            transition: opacity 0.3s ease;
        }

        .sidebar.collapsed .game-text {
            opacity: 0;
            width: 0;
        }

        /* 主内容区域 */
        .main-content {
            flex: 1;
            padding: 30px;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .game-container {
            flex: 1;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            position: relative;
        }

        #machine {
            width: 100%;
            height: 100%;
            border: none;
            background: #f8f9fa;
        }

        /* 加载动画 */
        .loading {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            display: none;
        }

        .loading.show {
            display: block;
        }

        .spinner {
            width: 50px;
            height: 50px;
            border: 3px solid #e3e3e3;
            border-top: 3px solid #667eea;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .sidebar {
                position: absolute;
                left: -280px;
                width: 280px;
                height: 100vh;
                border-radius: 0 20px 20px 0;
                z-index: 1000;
            }

            .sidebar.open {
                left: 0;
            }

            .main-content {
                padding: 20px;
            }

            .mobile-toggle {
                position: fixed;
                top: 20px;
                left: 20px;
                z-index: 1001;
                background: rgba(255, 255, 255, 0.9);
                border: none;
                border-radius: 10px;
                padding: 10px;
                cursor: pointer;
                box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
            }
        }

        /* 背景装饰 */
        .bg-decoration {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
        }

        .bg-circle {
            position: absolute;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.1);
            animation: float 6s ease-in-out infinite;
        }

        .bg-circle:nth-child(1) {
            width: 80px;
            height: 80px;
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }

        .bg-circle:nth-child(2) {
            width: 120px;
            height: 120px;
            top: 60%;
            right: 10%;
            animation-delay: 2s;
        }

        .bg-circle:nth-child(3) {
            width: 100px;
            height: 100px;
            bottom: 20%;
            left: 20%;
            animation-delay: 4s;
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-20px); }
        }