:root {
            /* Define a basic color scheme */
            --bg-color: #1a1a2e; /* Dark background */
            --text-color: #e94560; /* Vibrant red/pink for display */
            --card-color: #2c2c4d; /* Slightly lighter dark for container */
            --button-bg: #16213e; /* Darker blue for buttons */
            --button-hover: #0f3460; /* Dark blue on hover */
            --button-text: #fff;
            --lap-bg: #3e4c6b;
        }

        body {
            font-family: 'Arial', sans-serif;
            background-color: var(--bg-color);
            color: var(--button-text);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            padding: 20px;
        }

        .stopwatch-container {
            /* Center the stopwatch */
            text-align: center;
            background-color: var(--card-color);
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
            max-width: 400px;
            width: 100%;
        }

        /* Digital Clock Styling */
        .display {
            font-size: 3.5rem; /* font size */
            font-weight: bold;
            color: var(--text-color);
            margin-bottom: 30px;
            /* monospace font for a digital look */
            font-family: 'monospace', 'Courier New', monospace;
            padding: 10px 0;
            border-bottom: 2px solid var(--button-bg);
        }

        /* Button Layout using Flexbox */
        .controls {
            display: flex;
            justify-content: space-around;
            gap: 10px;
            margin-bottom: 30px;
        }

        .btn {
            flex-grow: 1; /* Equal width for all buttons */
            padding: 12px 15px;
            font-size: 1.1rem;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            background-color: var(--button-bg);
            color: var(--button-text);
            transition: background-color 0.3s ease, transform 0.1s ease;
            font-weight: 600;
        }

        /* Specific Button Colors and Hover Effects */
        .btn:hover {
            background-color: var(--button-hover);
            transform: translateY(-2px);
        }

        #startBtn { background-color: #4CAF50; } /* Green */
        #startBtn:hover { background-color: #45a049; }

        #stopBtn { background-color: #FF5733; } /* Orange/Red */
        #stopBtn:hover { background-color: #e64a19; }

        #resetBtn { background-color: #5D5D5D; } /* Gray */
        #resetBtn:hover { background-color: #4a4a4a; }

        #lapBtn { background-color: #337AFF; } /* Blue */
        #lapBtn:hover { background-color: #2a6ae6; }

        /* Lap Times Styling */
        .laps-container {
            max-height: 200px;
            overflow-y: auto;
            border-top: 1px solid var(--lap-bg);
            padding-top: 15px;
            text-align: left;
        }

        .laps-container h3 {
            margin-top: 0;
            color: var(--text-color);
            border-bottom: 1px solid var(--lap-bg);
            padding-bottom: 5px;
        }

        #lapsList {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        #lapsList li {
            background-color: var(--lap-bg);
            padding: 10px;
            margin-bottom: 8px;
            border-radius: 8px;
            display: flex;
            justify-content: space-between;
            font-family: 'monospace';
            font-size: 0.95rem;
        }

        /* Responsive Design */
        @media (max-width: 600px) {
            .display {
                font-size: 3rem;
            }
            .controls {
                flex-direction: column; /* Stack buttons vertically on small screens */
            }
            .btn {
                width: 100%;
                margin-bottom: 10px;
            }
            .stopwatch-container {
                padding: 30px;
            }
        }