<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>원형 파티클</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
      margin: 0;
      background-color: #f5f5f5;
      overflow: hidden;
    }

    .container-wrapper {
      position: relative;
      width: 300px;
      height: 300px;
    }

    /* 방사형 애니메이션 */
    .ripple-effect {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background: conic-gradient(
        red, orange, yellow, green, cyan, blue, violet, red
      );
      animation: rotate 4s linear infinite;
      filter: blur(10px);
    }

    @keyframes rotate {
      from {
        transform: rotate(0deg);
      }
      to {
        transform: rotate(360deg);
      }
    }

    /* 컨테이너 */
    .container {
      position: relative;
      text-align: center;
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #e0f7fa;
      border: 2px solid #333;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      z-index: 1;
    }

    .container h1 {
      font-size: 1.5rem;
      margin: 0;
    }

    .container .days {
      font-size: 2.5rem;
      font-weight: bold;
      color: #d32f2f;
      margin: 10px 0;
    }

    .container p {
      font-size: 1rem;
      margin: 5px 0;
    }

    @keyframes particleMove {
      0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
      }
      100% {
        transform: translate(var(--x), var(--y)) scale(0.5);
        opacity: 0;
      }
    }

    /* 날짜 입력창 */
    .input-wrapper {
      margin-bottom: 20px;
      text-align: center;
    }

    .input-wrapper input {
      padding: 8px;
      font-size: 1rem;
      border: 1px solid #ccc;
      border-radius: 4px;
    }

    .input-wrapper button {
      padding: 8px 16px;
      font-size: 1rem;
      margin-left: 10px;
      background-color: #007aff;
      color: white;
      border: none;
      border-radius: 4px;
      cursor: pointer;
    }

    .input-wrapper button:hover {
      background-color: #005ecb;
    }
  </style>
</head>
<body>
  <div class="input-wrapper">
    <input type="date" id="startDateInput" />
    <button onclick="applyStartDate()">날짜 적용</button>
  </div>
  <div class="container-wrapper">
    <div class="ripple-effect"></div>
    <div class="container">
      <h1>책 읽기</h1>
      <div class="days" id="days">0</div>
      <p id="message">일 연속으로 책 읽기를 달성했군요.</p>
      <p>축하합니다!</p>
    </div>
  </div>

  <script>
    let startDate = new Date(); // 기본 시작 날짜를 오늘로 설정
    let particleAngle = 0; // 초기 파티클 각도

    // 날짜 계산 및 표시
    function updateDays() {
      const currentDate = new Date();
      const diffTime = currentDate - startDate;
      const diffDays = Math.max(Math.floor(diffTime / (1000 * 60 * 60 * 24)), 0); // 최소 0일
      document.getElementById("days").textContent = diffDays;
      document.getElementById("message").textContent = `${diffDays}일 연속으로 책 읽기를 달성했군요.`;
    }

    // 날짜 입력 적용
    function applyStartDate() {
      const inputDate = document.getElementById("startDateInput").value;
      if (inputDate) {
        startDate = new Date(inputDate);
        updateDays();
      }
    }
    updateDays(); // 초기 날짜 표시
  </script>
</body>
</html>

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