body {
            font-family: 'Arial', sans-serif;
            margin: 0;
            padding: 20px;
            background-color: #f8f9fa;
            color: #212529;
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 20px;
        }
        h1 {
            text-align: center;
            color: #343a40;
            margin-bottom: 30px;
        }
        .time-display {
            font-size: 3rem;
            text-align: center;
            margin-bottom: 40px;
            font-weight: bold;
            color: #007bff;
        }
        .countdown-container {
            margin-bottom: 30px;
            padding: 15px;
            border-radius: 8px;
            background-color: #f1f3f5;
        }
        .countdown-title {
            font-size: 1.25rem;
            margin-bottom: 10px;
            color: #495057;
            font-weight: bold;
        }
        .countdown-value {
            font-size: 1.5rem;
            font-weight: bold;
            color: #dc3545;
        }
        .countdown-text {
            margin-top: 5px;
            color: #6c757d;
        }
        .pomodoro-container {
            margin-top: 40px;
            padding: 20px;
            border-radius: 8px;
            background-color: #e9ecef;
            text-align: center;
        }
        .pomodoro-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: #343a40;
        }
        .pomodoro-timer {
            font-size: 2.5rem;
            margin: 20px 0;
            color: #28a745;
            font-weight: bold;
        }
        .pomodoro-rounds {
            font-size: 1.25rem;
            margin-bottom: 20px;
            color: #6c757d;
        }
        .button-group {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 20px;
        }
        button {
            padding: 10px 20px;
            font-size: 1rem;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .btn-start {
            background-color: #28a745;
            color: white;
        }
        .btn-start:hover {
            background-color: #218838;
        }
        .btn-reset {
            background-color: #dc3545;
            color: white;
        }
        .btn-reset:hover {
            background-color: #c82333;
        }
        .btn-continue {
            background-color: #007bff;
            color: white;
        }
        .btn-continue:hover {
            background-color: #0069d9;
        }
        .pomodoro-input {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
            gap: 10px;
        }
        .pomodoro-input input {
            width: 60px;
            padding: 8px;
            font-size: 1rem;
            border: 1px solid #ced4da;
            border-radius: 4px;
        }
        .pomodoro-input label {
            font-size: 1rem;
            color: #495057;
        }
        .notification {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            background-color: #dc3545;
            color: white;
            padding: 15px 30px;
            border-radius: 5px;
            font-size: 18px;
            font-weight: bold;
            z-index: 1000;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            animation: fadeInOut 10s forwards;
        }
        @keyframes fadeInOut {
            0% { opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { opacity: 0; }
        }