Animated Countdown Timer

<div class="header">
  <h1>⏰ Countdown Timer</h1>
  <p>Beautiful animated timer with custom settings</p>
</div>

<div class="timer-container">
  <div class="time-setter">
    <h3>Set Countdown Time</h3>
    <div class="input-grid">
      <div class="input-group">
        <label>Days</label>
        <input type="number" id="inputDays" min="0" max="365" value="0">
      </div>
      <div class="input-group">
        <label>Hours</label>
        <input type="number" id="inputHours" min="0" max="23" value="0">
      </div>
      <div class="input-group">
        <label>Minutes</label>
        <input type="number" id="inputMinutes" min="0" max="59" value="5">
      </div>
      <div class="input-group">
        <label>Seconds</label>
        <input type="number" id="inputSeconds" min="0" max="59" value="0">
      </div>
    </div>
  </div>

  <h2 class="timer-title" id="timerStatus">Time Remaining</h2>

  <div class="countdown" id="countdown">
    <div class="time-unit">
      <div class="time-box">
        <svg class="progress-ring" viewBox="0 0 100 100">
          <circle cx="50" cy="50" r="45"></circle>
        </svg>
        <div class="time-value" id="days">00</div>
        <div class="time-label">Days</div>
      </div>
    </div>
    <div class="time-unit">
      <div class="time-box">
        <svg class="progress-ring" viewBox="0 0 100 100">
          <circle cx="50" cy="50" r="45"></circle>
        </svg>
        <div class="time-value" id="hours">00</div>
        <div class="time-label">Hours</div>
      </div>
    </div>
    <div class="time-unit">
      <div class="time-box">
        <svg class="progress-ring" viewBox="0 0 100 100">
          <circle cx="50" cy="50" r="45"></circle>
        </svg>
        <div class="time-value" id="minutes">05</div>
        <div class="time-label">Minutes</div>
      </div>
    </div>
    <div class="time-unit">
      <div class="time-box">
        <svg class="progress-ring" viewBox="0 0 100 100">
          <circle cx="50" cy="50" r="45"></circle>
        </svg>
        <div class="time-value" id="seconds">00</div>
        <div class="time-label">Seconds</div>
      </div>
    </div>
  </div>

  <div class="controls">
    <button class="btn btn-primary" id="startBtn" onclick="startTimer()">▶ Start</button>
    <button class="btn btn-secondary" id="pauseBtn" onclick="pauseTimer()" style="display: none;">⏸ Pause</button>
    <button class="btn btn-secondary" onclick="resetTimer()">🔄 Reset</button>
  </div>
</div>

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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #cddafd 0%, #e7f0ff 100%);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .header {
      text-align: center;
      margin-bottom: 50px;
      animation: fadeInDown 1s ease;
    }

    .header h1 {
      font-size: 3rem;
      font-weight: 700;
      color: #0d1b2a;
      margin-bottom: 10px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    }

    .header p {
      font-size: 1.2rem;
      color: #415a77;
    }

    @keyframes fadeInDown {
      from {
        opacity: 0;
        transform: translateY(-30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .timer-container {
      background: white;
      border-radius: 30px;
      padding: 60px 50px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
      animation: fadeInUp 1s ease 0.3s backwards;
      position: relative;
      overflow: hidden;
    }

    .timer-container::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 6px;
      background: linear-gradient(90deg, #cddafd 0%, #a1c4fd 50%, #cddafd 100%);
      background-size: 200% 100%;
      animation: shimmer 3s linear infinite;
    }

    @keyframes shimmer {
      0% {
        background-position: 200% 0;
      }
      100% {
        background-position: -200% 0;
      }
    }

    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(50px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .timer-title {
      text-align: center;
      font-size: 1.8rem;
      color: #0d1b2a;
      margin-bottom: 40px;
      font-weight: 700;
    }

    .countdown {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 25px;
      margin-bottom: 40px;
    }

    .time-unit {
      text-align: center;
      position: relative;
    }

    .time-box {
      background: linear-gradient(135deg, #cddafd 0%, #b8cff5 100%);
      border-radius: 20px;
      padding: 30px 20px;
      box-shadow: 0 10px 30px rgba(205, 218, 253, 0.4);
      position: relative;
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .time-box:hover {
      transform: translateY(-10px);
      box-shadow: 0 15px 40px rgba(205, 218, 253, 0.6);
    }

    .time-box::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.3), transparent);
      transform: rotate(45deg);
      animation: shine 3s infinite;
    }

    @keyframes shine {
      0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
      }
      100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
      }
    }

    .time-value {
      font-size: 4rem;
      font-weight: 700;
      color: #0d1b2a;
      line-height: 1;
      margin-bottom: 10px;
      position: relative;
      z-index: 1;
      animation: pulse 1s ease-in-out infinite;
    }

    @keyframes pulse {
      0%, 100% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.05);
      }
    }

    .time-label {
      font-size: 1rem;
      color: #415a77;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 2px;
      position: relative;
      z-index: 1;
    }

    /* Progress Rings */
    .progress-ring {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 90%;
      height: 90%;
      opacity: 0.3;
    }

    .progress-ring circle {
      fill: none;
      stroke: #0d1b2a;
      stroke-width: 3;
      stroke-dasharray: 283;
      stroke-dashoffset: 283;
      transform: rotate(-90deg);
      transform-origin: center;
      animation: progress 1s ease-out forwards;
    }

    @keyframes progress {
      to {
        stroke-dashoffset: 0;
      }
    }

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

    .btn {
      padding: 15px 35px;
      border: none;
      border-radius: 15px;
      font-size: 1.1rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #cddafd 0%, #a1c4fd 100%);
      color: #0d1b2a;
      box-shadow: 0 6px 20px rgba(205, 218, 253, 0.4);
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 10px 30px rgba(205, 218, 253, 0.6);
    }

    .btn-secondary {
      background: #e0e0e0;
      color: #555;
    }

    .btn-secondary:hover {
      background: #d0d0d0;
      transform: translateY(-3px);
    }

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

    /* Custom Time Input */
    .time-setter {
      background: rgba(205, 218, 253, 0.2);
      border-radius: 20px;
      padding: 30px;
      margin-bottom: 30px;
      animation: fadeInUp 1s ease 0.5s backwards;
    }

    .time-setter h3 {
      text-align: center;
      color: #0d1b2a;
      margin-bottom: 20px;
      font-size: 1.3rem;
    }

    .input-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 15px;
      margin-bottom: 20px;
    }

    .input-group {
      text-align: center;
    }

    .input-group label {
      display: block;
      color: #415a77;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      text-transform: uppercase;
    }

    .input-group input {
      width: 100%;
      padding: 12px;
      border: 2px solid #cddafd;
      border-radius: 10px;
      font-size: 1.2rem;
      font-weight: 700;
      text-align: center;
      color: #0d1b2a;
      transition: all 0.3s ease;
    }

    .input-group input:focus {
      outline: none;
      border-color: #a1c4fd;
      box-shadow: 0 0 0 3px rgba(205, 218, 253, 0.3);
    }

    /* Expired State */
    .expired {
      text-align: center;
      padding: 40px;
      animation: zoomIn 0.5s ease;
    }

    .expired-icon {
      font-size: 5rem;
      margin-bottom: 20px;
      animation: bounce 1s ease infinite;
    }

    @keyframes zoomIn {
      from {
        transform: scale(0);
        opacity: 0;
      }
      to {
        transform: scale(1);
        opacity: 1;
      }
    }

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

    .expired h2 {
      color: #0d1b2a;
      font-size: 2.5rem;
      margin-bottom: 15px;
    }

    .expired p {
      color: #415a77;
      font-size: 1.2rem;
    }

    @media (max-width: 768px) {
      .header h1 {
        font-size: 2rem;
      }

      .timer-container {
        padding: 40px 30px;
      }

      .countdown {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
      }

      .time-value {
        font-size: 3rem;
      }

      .input-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .controls {
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }
    }

    let countdownInterval;
    let isPaused = false;
    let endTime;
    let remainingTime;

    function startTimer() {
      const days = parseInt(document.getElementById('inputDays').value) || 0;
      const hours = parseInt(document.getElementById('inputHours').value) || 0;
      const minutes = parseInt(document.getElementById('inputMinutes').value) || 0;
      const seconds = parseInt(document.getElementById('inputSeconds').value) || 0;

      const totalSeconds = (days * 86400) + (hours * 3600) + (minutes * 60) + seconds;

      if (totalSeconds <= 0) {
        alert('Please set a valid time!');
        return;
      }

      if (isPaused && remainingTime) {
        endTime = Date.now() + remainingTime;
      } else {
        endTime = Date.now() + (totalSeconds * 1000);
      }

      isPaused = false;
      document.getElementById('startBtn').style.display = 'none';
      document.getElementById('pauseBtn').style.display = 'inline-block';

      countdownInterval = setInterval(updateCountdown, 100);
    }

    function updateCountdown() {
      const now = Date.now();
      remainingTime = endTime - now;

      if (remainingTime <= 0) {
        clearInterval(countdownInterval);
        showExpired();
        return;
      }

      const days = Math.floor(remainingTime / (1000 * 60 * 60 * 24));
      const hours = Math.floor((remainingTime % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
      const minutes = Math.floor((remainingTime % (1000 * 60 * 60)) / (1000 * 60));
      const seconds = Math.floor((remainingTime % (1000 * 60)) / 1000);

      document.getElementById('days').textContent = String(days).padStart(2, '0');
      document.getElementById('hours').textContent = String(hours).padStart(2, '0');
      document.getElementById('minutes').textContent = String(minutes).padStart(2, '0');
      document.getElementById('seconds').textContent = String(seconds).padStart(2, '0');
    }

    function pauseTimer() {
      clearInterval(countdownInterval);
      isPaused = true;
      document.getElementById('startBtn').style.display = 'inline-block';
      document.getElementById('pauseBtn').style.display = 'none';
      document.getElementById('startBtn').textContent = '▶ Resume';
    }

    function resetTimer() {
      clearInterval(countdownInterval);
      isPaused = false;
      remainingTime = null;
      document.getElementById('days').textContent = '00';
      document.getElementById('hours').textContent = '00';
      document.getElementById('minutes').textContent = '00';
      document.getElementById('seconds').textContent = '00';
      document.getElementById('startBtn').style.display = 'inline-block';
      document.getElementById('pauseBtn').style.display = 'none';
      document.getElementById('startBtn').textContent = '▶ Start';
      document.getElementById('timerStatus').textContent = 'Time Remaining';
      
      const countdown = document.getElementById('countdown');
      countdown.innerHTML = `
        <div class="time-unit">
          <div class="time-box">
            <svg class="progress-ring" viewBox="0 0 100 100">
              <circle cx="50" cy="50" r="45"></circle>
            </svg>
            <div class="time-value" id="days">00</div>
            <div class="time-label">Days</div>
          </div>
        </div>
        <div class="time-unit">
          <div class="time-box">
            <svg class="progress-ring" viewBox="0 0 100 100">
              <circle cx="50" cy="50" r="45"></circle>
            </svg>
            <div class="time-value" id="hours">00</div>
            <div class="time-label">Hours</div>
          </div>
        </div>
        <div class="time-unit">
          <div class="time-box">
            <svg class="progress-ring" viewBox="0 0 100 100">
              <circle cx="50" cy="50" r="45"></circle>
            </svg>
            <div class="time-value" id="minutes">00</div>
            <div class="time-label">Minutes</div>
          </div>
        </div>
        <div class="time-unit">
          <div class="time-box">
            <svg class="progress-ring" viewBox="0 0 100 100">
              <circle cx="50" cy="50" r="45"></circle>
            </svg>
            <div class="time-value" id="seconds">00</div>
            <div class="time-label">Seconds</div>
          </div>
        </div>
      `;
    }

    function showExpired() {
      document.getElementById('timerStatus').textContent = '⏰ Time\'s Up!';
      const countdown = document.getElementById('countdown');
      countdown.innerHTML = `
        <div class="expired" style="grid-column: 1 / -1;">
          <div class="expired-icon">🎉</div>
          <h2>Countdown Complete!</h2>
          <p>The timer has reached zero</p>
        </div>
      `;
      document.getElementById('startBtn').style.display = 'inline-block';
      document.getElementById('pauseBtn').style.display = 'none';
      document.getElementById('startBtn').textContent = '▶ Start';
    }