Javascript Timer Countdown with Seconds

<script type="module" src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.esm.js"></script>
<script nomodule src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.js"></script>

<div class="container">
  <h1>Countdown Timer</h1>
  <p class="subtitle">Set your time and start counting down</p>

  <div class="timer-display">
    <div class="time-unit">
      <div class="time-value" id="hours">00</div>
      <div class="time-label">Hours</div>
    </div>
    <div class="time-unit">
      <div class="time-value" id="minutes">00</div>
      <div class="time-label">Minutes</div>
    </div>
    <div class="time-unit">
      <div class="time-value" id="seconds">00</div>
      <div class="time-label">Seconds</div>
    </div>
  </div>

  <div class="input-section">
    <div class="input-group">
      <div class="input-wrapper">
        <label>Hours</label>
        <input type="number" id="inputHours" min="0" max="23" value="0">
      </div>
      <div class="input-wrapper">
        <label>Minutes</label>
        <input type="number" id="inputMinutes" min="0" max="59" value="5">
      </div>
      <div class="input-wrapper">
        <label>Seconds</label>
        <input type="number" id="inputSeconds" min="0" max="59" value="0">
      </div>
    </div>

    <div class="controls">
      <button class="btn" id="startBtn">
        <ion-icon name="play-outline"></ion-icon>
        Start
      </button>
      <button class="btn btn-secondary" id="pauseBtn" disabled>
        <ion-icon name="pause-outline"></ion-icon>
        Pause
      </button>
      <button class="btn btn-danger" id="resetBtn">
        <ion-icon name="refresh-outline"></ion-icon>
        Reset
      </button>
    </div>
  </div>

  <div class="progress-bar">
    <div class="progress-fill" id="progressBar"></div>
  </div>

  <div class="status-message" id="statusMessage">
    🎉 Time's Up!
  </div>
</div> 

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
            padding: 50px 40px;
            width: 100%;
            max-width: 500px;
            text-align: center;
        }

        h1 {
            font-size: 28px;
            color: #333;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .subtitle {
            color: #666;
            font-size: 14px;
            margin-bottom: 40px;
        }

        .timer-display {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
        }

        .time-unit {
            background: linear-gradient(135deg, #2c5364 0%, #203a43 100%);
            border-radius: 16px;
            padding: 20px;
            min-width: 100px;
            box-shadow: 0 8px 20px rgba(44, 83, 100, 0.3);
        }

        .time-value {
            font-size: 48px;
            font-weight: 700;
            color: #fff;
            line-height: 1;
            font-family: 'Courier New', monospace;
        }

        .time-label {
            font-size: 12px;
            color: #a0d0e0;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-top: 8px;
            font-weight: 500;
        }

        .input-section {
            background: #f7f9fa;
            border-radius: 12px;
            padding: 30px;
            margin-bottom: 30px;
        }

        .input-group {
            display: flex;
            gap: 15px;
            justify-content: center;
            align-items: center;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .input-wrapper {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }

        .input-wrapper label {
            font-size: 12px;
            color: #666;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-weight: 600;
        }

        input[type="number"] {
            width: 80px;
            padding: 12px;
            font-size: 18px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            text-align: center;
            font-weight: 600;
            color: #333;
            transition: border-color 0.3s;
        }

        input[type="number"]:focus {
            outline: none;
            border-color: #2c5364;
        }

        .controls {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn {
            background: linear-gradient(135deg, #2c5364 0%, #203a43 100%);
            color: white;
            border: none;
            border-radius: 12px;
            padding: 14px 28px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
            min-width: 120px;
            justify-content: center;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(44, 83, 100, 0.4);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .btn-secondary {
            background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
        }

        .btn-danger {
            background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
        }

        .status-message {
            margin-top: 20px;
            padding: 15px;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 500;
            display: none;
        }

        .status-complete {
            background: #d4edda;
            color: #155724;
            display: block;
            animation: pulse 1s infinite;
        }

        @keyframes pulse {
            0%, 100% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.02);
            }
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: #e0e0e0;
            border-radius: 3px;
            margin-top: 30px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #2c5364 0%, #0f2027 100%);
            width: 0%;
            transition: width 0.3s ease;
        }

   let countdown;
        let totalSeconds = 0;
        let remainingSeconds = 0;
        let isPaused = false;

        const hoursDisplay = document.getElementById('hours');
        const minutesDisplay = document.getElementById('minutes');
        const secondsDisplay = document.getElementById('seconds');
        const inputHours = document.getElementById('inputHours');
        const inputMinutes = document.getElementById('inputMinutes');
        const inputSeconds = document.getElementById('inputSeconds');
        const startBtn = document.getElementById('startBtn');
        const pauseBtn = document.getElementById('pauseBtn');
        const resetBtn = document.getElementById('resetBtn');
        const statusMessage = document.getElementById('statusMessage');
        const progressBar = document.getElementById('progressBar');

        function formatTime(value) {
            return value < 10 ? '0' + value : value;
        }

        function updateDisplay() {
            const hours = Math.floor(remainingSeconds / 3600);
            const minutes = Math.floor((remainingSeconds % 3600) / 60);
            const seconds = remainingSeconds % 60;

            hoursDisplay.textContent = formatTime(hours);
            minutesDisplay.textContent = formatTime(minutes);
            secondsDisplay.textContent = formatTime(seconds);

            updateProgressBar();
        }

        function updateProgressBar() {
            if (totalSeconds > 0) {
                const progress = ((totalSeconds - remainingSeconds) / totalSeconds) * 100;
                progressBar.style.width = progress + '%';
            }
        }

        function startTimer() {
            if (remainingSeconds === 0) {
                const hours = parseInt(inputHours.value) || 0;
                const minutes = parseInt(inputMinutes.value) || 0;
                const seconds = parseInt(inputSeconds.value) || 0;

                totalSeconds = hours * 3600 + minutes * 60 + seconds;
                remainingSeconds = totalSeconds;

                if (totalSeconds === 0) {
                    alert('Please set a time greater than 0');
                    return;
                }
            }

            statusMessage.style.display = 'none';
            isPaused = false;

            startBtn.disabled = true;
            pauseBtn.disabled = false;
            inputHours.disabled = true;
            inputMinutes.disabled = true;
            inputSeconds.disabled = true;

            countdown = setInterval(() => {
                remainingSeconds--;
                updateDisplay();

                if (remainingSeconds === 0) {
                    clearInterval(countdown);
                    statusMessage.style.display = 'block';
                    startBtn.disabled = false;
                    pauseBtn.disabled = true;
                    inputHours.disabled = false;
                    inputMinutes.disabled = false;
                    inputSeconds.disabled = false;
                    playSound();
                }
            }, 1000);

            updateDisplay();
        }

        function pauseTimer() {
            clearInterval(countdown);
            isPaused = true;
            startBtn.disabled = false;
            pauseBtn.disabled = true;
            startBtn.innerHTML = '<ion-icon name="play-outline"></ion-icon> Resume';
        }

        function resetTimer() {
            clearInterval(countdown);
            remainingSeconds = 0;
            totalSeconds = 0;
            isPaused = false;
            
            hoursDisplay.textContent = '00';
            minutesDisplay.textContent = '00';
            secondsDisplay.textContent = '00';
            
            startBtn.disabled = false;
            pauseBtn.disabled = true;
            inputHours.disabled = false;
            inputMinutes.disabled = false;
            inputSeconds.disabled = false;
            
            statusMessage.style.display = 'none';
            progressBar.style.width = '0%';
            
            startBtn.innerHTML = '<ion-icon name="play-outline"></ion-icon> Start';
        }

        function playSound() {
            // Create a simple beep sound
            const audioContext = new (window.AudioContext || window.webkitAudioContext)();
            const oscillator = audioContext.createOscillator();
            const gainNode = audioContext.createGain();

            oscillator.connect(gainNode);
            gainNode.connect(audioContext.destination);

            oscillator.frequency.value = 800;
            oscillator.type = 'sine';

            gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
            gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + 0.5);

            oscillator.start(audioContext.currentTime);
            oscillator.stop(audioContext.currentTime + 0.5);
        }

        startBtn.addEventListener('click', startTimer);
        pauseBtn.addEventListener('click', pauseTimer);
        resetBtn.addEventListener('click', resetTimer);

        // Prevent invalid input
        [inputHours, inputMinutes, inputSeconds].forEach(input => {
            input.addEventListener('input', function() {
                if (this.value < 0) this.value = 0;
                if (this === inputHours && this.value > 23) this.value = 23;
                if (this !== inputHours && this.value > 59) this.value = 59;
            });
        });