:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #f72585;
            --secondary-dark: #e20c72;
            --success: #4cc9f0;
            --success-dark: #3bb4e0;
            --danger: #f94144;
            --danger-dark: #e02e31;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --card-bg: rgba(255, 255, 255, 0.05);
            --card-border: rgba(255, 255, 255, 0.1);
        }

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

        body {
            background: linear-gradient(135deg, #1a2a6c, #2b5876, #4e4376);
            color: var(--light);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 2rem;
        }

        .container {
            width: 100%;
            max-width: 1000px;
            background: rgba(33, 37, 41, 0.95);
            border-radius: 20px;
            box-shadow: 0 15px 50px rgba(0, 0, 0, 0.4);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        header {
            background: linear-gradient(90deg, var(--primary), var(--primary-dark));
            padding: 1.5rem 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .logo i {
            font-size: 2.2rem;
            color: var(--light);
        }

        .logo h1 {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--light);
        }

        .main-content {
            padding: 2.5rem;
        }

        .timer-section {
            margin-bottom: 2.5rem;
        }

        .section-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: var(--success);
            text-align: center;
            font-weight: 700;
        }

        .cube-selector {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .cube-option {
            background: rgba(67, 97, 238, 0.2);
            padding: 1rem;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 2px solid transparent;
            font-weight: 600;
            color: var(--light);
            text-align: center;
        }

        .cube-option:hover {
            background: rgba(67, 97, 238, 0.4);
            transform: translateY(-3px);
        }

        .cube-option.active {
            background: var(--primary);
            border-color: var(--success);
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.4);
        }

        .timer-display-container {
            text-align: center;
            margin: 2rem 0;
        }

        .timer-display {
            font-size: 5rem;
            font-weight: 800;
            font-family: 'Courier New', monospace;
            background: rgba(0, 0, 0, 0.3);
            padding: 1.5rem;
            border-radius: 16px;
            border: 2px solid var(--primary);
            color: var(--light);
            margin-bottom: 0.5rem;
            text-shadow: 0 0 10px rgba(76, 201, 240, 0.5);
        }

        .time-labels {
            display: flex;
            justify-content: center;
            gap: 4.5rem;
            margin-top: 0.5rem;
        }

        .time-label {
            font-size: 0.85rem;
            color: var(--success);
            font-weight: 600;
            text-transform: uppercase;
        }

        .timer-controls {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin: 2rem 0;
            flex-wrap: wrap;
        }

        .btn {
            padding: 1rem 2rem;
            border: none;
            border-radius: 10px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1rem;
        }

        .btn-primary {
            background: var(--primary);
            color: white;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(67, 97, 238, 0.4);
        }

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

        .btn-secondary:hover {
            background: var(--secondary-dark);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(247, 37, 133, 0.4);
        }

        .btn-success {
            background: var(--success);
            color: var(--dark);
            font-weight: 700;
        }

        .btn-success:hover {
            background: var(--success-dark);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(76, 201, 240, 0.4);
        }

        .times-section {
            background: rgba(0, 0, 0, 0.2);
            border-radius: 16px;
            padding: 2rem;
            margin-top: 2rem;
        }

        .times-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .times-header h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--success);
        }

        .export-options {
            display: flex;
            gap: 0.8rem;
            flex-wrap: wrap;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            background: rgba(0, 0, 0, 0.2);
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 2rem;
        }

        th, td {
            padding: 1.2rem 1rem;
            text-align: left;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        th {
            background: var(--primary);
            font-weight: 600;
            color: white;
        }

        tr:last-child td {
            border-bottom: none;
        }

        tr:hover {
            background: rgba(67, 97, 238, 0.1);
        }

        .btn-danger {
            background: var(--danger);
            color: white;
            padding: 0.5rem 1rem;
            font-size: 0.9rem;
        }

        .btn-danger:hover {
            background: var(--danger-dark);
            transform: translateY(-2px);
            box-shadow: 0 5px 10px rgba(249, 65, 68, 0.4);
        }

        .stats-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin-top: 2rem;
        }

        .stat-card {
            background: rgba(67, 97, 238, 0.15);
            padding: 1.5rem;
            border-radius: 12px;
            text-align: center;
            border: 1px solid rgba(67, 97, 238, 0.3);
        }

        .stat-value {
            font-size: 2rem;
            font-weight: 800;
            margin: 0.5rem 0;
            color: var(--success);
        }

        .stat-label {
            color: var(--light);
            font-size: 0.9rem;
            font-weight: 600;
        }

        footer {
            text-align: center;
            padding: 1.5rem;
            color: var(--light);
            background-color: rgba(0, 0, 0, 0.3);
            font-size: 0.9rem;
        }

        .instructions {
            margin-top: 2rem;
            text-align: center;
            font-size: 0.9rem;
            color: var(--success);
            padding: 1rem;
            background: rgba(0, 0, 0, 0.2);
            border-radius: 8px;
        }

        @media (max-width: 768px) {
            body {
                padding: 1rem;
            }
            
            .timer-display {
                font-size: 3.5rem;
                padding: 1rem;
            }
            
            .time-labels {
                gap: 2.8rem;
            }
            
            .time-label {
                font-size: 0.7rem;
            }
            
            .cube-option {
                padding: 0.8rem 0.5rem;
                font-size: 0.9rem;
            }
            
            .btn {
                padding: 0.8rem 1.2rem;
                font-size: 0.9rem;
            }
            
            .times-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .export-options {
                width: 100%;
                justify-content: center;
            }
            
            th, td {
                padding: 1rem 0.5rem;
            }
            
            .main-content {
                padding: 1.5rem;
            }
        }