:root {
        /* 暖色系パレット */
        --bg-dark: #1a0f0a;
        --bg-warm: #4a2c18;
        --accent-gold: #ffcc66;
        --text-white: #fdfdfd;
        --text-sub: #d0c0b0;
      }

      body {
        margin: 0;
        padding: 0;
        background-color: var(--bg-dark);
        color: var(--text-white);
        font-family: "Cinzel", "Noto Serif JP", serif;
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
        overflow: hidden;
        position: relative;
      }

      /* 背景 */
      .background-layer {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -2;
        background: radial-gradient(
            circle at 80% 20%,
            rgba(255, 200, 100, 0.15) 0%,
            transparent 40%
          ),
          radial-gradient(
            circle at 20% 80%,
            rgba(200, 100, 50, 0.2) 0%,
            transparent 50%
          ),
          linear-gradient(135deg, #2b1508 0%, #1a0a05 100%);
      }

      .particles-container {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
        overflow: hidden;
        pointer-events: none;
      }

      .particle {
        position: absolute;
        border-radius: 50%;
        background: radial-gradient(
          circle,
          rgba(255, 220, 150, 0.8) 0%,
          rgba(255, 180, 80, 0) 70%
        );
        opacity: 0;
      }

      /* 時計全体のコンテナ */
      .clock-container {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        z-index: 10;
        width: 100%;
        max-width: 1000px;
        padding: 0 20px;
        box-sizing: border-box;
      }

      /* キャッチコピー */
      .copy-text {
        text-align: center;
        margin-bottom: 1.5rem;
        animation: fadeIn 2s ease-out;
      }

      .copy-main {
        font-family: "Noto Serif JP", serif;
        font-weight: 500;
        font-size: 2.2rem;
        letter-spacing: 0.1em;
        margin-bottom: 0.8rem;
        text-shadow: 0 0 10px rgba(255, 200, 100, 0.3);
        white-space: nowrap; /* 改行禁止 */
        color: var(--accent-gold);
      }

      /* 日付部分 */
      .date-display {
        font-family: "Cinzel", serif;
        font-size: 1.1rem;
        letter-spacing: 0.3em;
        color: var(--text-sub);
        border-bottom: 1px solid rgba(255, 204, 102, 0.3);
        padding-bottom: 5px;
        margin-bottom: 5px;
      }

      /* 時間表示ラッパー */
      .time-wrapper {
        display: flex;
        align-items: center; /* コロン位置修正: baselineからcenterへ変更 */
        justify-content: center;
        font-size: 6rem;
        line-height: 1;
        font-weight: 400;
        filter: drop-shadow(0 0 15px rgba(255, 160, 50, 0.3));
      }

      .digit-group {
        display: flex;
      }

      .digit-container {
        position: relative;
        width: 0.65em;
        height: 1.1em;
        overflow: hidden;
        display: flex;
        justify-content: center;
      }

      .digit {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        backface-visibility: hidden;
        font-feature-settings: "pnum";
      }

      /* コロン位置調整 */
      .colon {
        width: 0.35em;
        text-align: center;
        font-size: 0.8em; /* 少し小さくしてバランスを取る */
        color: var(--accent-gold);
        opacity: 0.8;
        padding-bottom: 0.1em; /* 視覚的な微調整 */
        animation: pulse 2s infinite ease-in-out;
      }

      @keyframes pulse {
        0%,
        100% {
          opacity: 0.6;
        }
        50% {
          opacity: 1;
          text-shadow: 0 0 8px var(--accent-gold);
        }
      }

      /* 背景透かし文字 */
      .watermark {
        position: absolute;
        bottom: -2%;
        right: 0;
        width: 100%;
        text-align: right;
        padding-right: 2%;
        font-size: 13vw;
        font-family: "Cinzel", serif;
        color: rgba(255, 255, 255, 0.04);
        pointer-events: none;
        white-space: nowrap;
        z-index: -1;
        line-height: 1;
      }

      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(20px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      /* --- レスポンシブ対応 --- */
      @media (max-width: 1024px) {
        .copy-main {
          font-size: 1.8rem;
        }
        .time-wrapper {
          font-size: 13vw;
        }
      }

      @media (max-width: 768px) {
        .copy-main {
          font-size: 5vw; /* 画面幅に合わせて縮小 */
          margin-bottom: 0.5rem;
        }
        .copy-sub {
          font-size: 2.8vw; /* 長い英文が改行されすぎないように */
        }
        .time-wrapper {
          font-size: 18vw; /* 時計を大きく */
        }
        .digit-container {
          width: 0.6em; /* 数字の間隔を少し詰める */
        }
        .clock-container {
          gap: 0.8rem;
          padding: 0 15px;
        }
        .watermark {
          font-size: 18vw;
          bottom: 2%;
        }
      }