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

    body, html {
      height: 100%;
      background: #121212;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #00ff99;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }

    .clock-container {
      background: #1e1e1e;
      padding: 30px 40px;
      border-radius: 16px;
      box-shadow: 0 4px 12px rgba(0, 255, 153, 0.2);
      text-align: center;
      width: 100%;
      max-width: 340px;
    }

    .greeting {
      font-size: 1.2rem;
      margin-bottom: 10px;
      color: #ffffffdd;
    }

    .time {
      font-size: 3rem;
      font-weight: bold;
      margin-bottom: 10px;
      color: #00ff99;
    }

    .date {
      font-size: 1.1rem;
      margin-bottom: 6px;
      color: #cccccc;
    }

    .day {
      font-size: 1rem;
      color: #aaaaaa;
    }

    @media (max-width: 400px) {
      .clock-container {
        padding: 20px 25px;
      }
      .time {
        font-size: 2.5rem;
      }
      .greeting {
        font-size: 1rem;
      }
    }