* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
  }

  body {
    background: #1b2738;
    color: #cbd5e1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1rem 1.5rem 3rem;
    margin: 0 auto;
  }

  header {
    background: #121923;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.6);
    margin-bottom: 2rem;
    border-radius: 8px;
    user-select: none;
  }

  header h1 {
    font-weight: 600;
    font-size: 2rem;
    color: #82aaff;
    letter-spacing: 2px;
  }

  h2.article-title {
    font-weight: 600;
    font-size: 1.9rem;
    margin-bottom: 0.6rem;
    color: #a3bffa;
  }

  p.date {
    font-size: 0.85rem;
    color: #7a8aaf;
    margin-bottom: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.5px;
  }

  .article-wrapper {
    max-width: 700px;
    margin: 0 auto;
  }

  article {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #d0d9f7;
    margin-bottom: 3rem;
  }

  article p {
    margin-bottom: 1.4rem;
  }

  article img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 1.6rem;
  }

  .btn-back {
    display: inline-block;
    padding: 0.55rem 1.5rem;
    background: #4c6ef5;
    color: white;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(76, 110, 245, 0.5);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    user-select: none;
    cursor: pointer;
  }

  .btn-back:hover,
  .btn-back:focus {
    background: #82aaff;
    box-shadow: 0 8px 20px rgba(130, 170, 255, 0.9);
    outline: none;
  }

  footer {
    margin-top: auto;
    text-align: center;
    color: #82aaff;
    font-size: 0.9rem;
    user-select: none;
    padding: 1rem 0;
  }

  footer a {
    color: #82aaff;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
  }

  footer a:hover,
  footer a:focus {
    color: #4c6ef5;
    outline: none;
  }

  @media (max-width: 500px) {
    .article-wrapper {
      padding: 0 0.2rem;
      max-width: 100%;
    }
    header h1 {
      font-size: 1.6rem;
    }
    h2.article-title {
      font-size: 1.5rem;
    }
  }