* {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: Arial, sans-serif;
      background: #f4f6fb;
      color: #222;
    }

    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 20px;
    }

    .card {
      background: #fff;
      border-radius: 18px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
      overflow: hidden;
      padding-bottom: 30px;
    }

    .banner {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    h1 {
      margin: 25px 0 10px;
      color: #d40000;
      text-align: center;
      font-size: 32px;
      letter-spacing: 1px;
      font-weight: bold;
    }

    .subtitle {
      text-align: center;
      font-size: 16px;
      color: #555;
      margin: 0 20px 25px;
      line-height: 1.5;
    }

    .menu-sections {
      display: block;
      margin: 0 22px 30px;
    }

    .section-title {
      font-size: 20px;
      color: navy;
      border-left: 5px solid #d40000;
      padding-left: 10px;
      margin: 25px 0 15px;
      font-weight: bold;
    }

    .form-box {
      background: #fdf2f2;
      border: 1px solid #fbc4c4;
      border-radius: 12px;
      padding: 20px;
      text-align: center;
      margin-bottom: 30px;
    }

    .form-box p {
      font-size: 16px;
      margin: 0 0 15px;
      color: #444;
    }

    .btn-submit-gopy {
      display: inline-block;
      padding: 14px 28px;
      background: #d40000;
      color: white;
      text-decoration: none;
      border-radius: 30px;
      font-weight: bold;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(212, 0, 0, 0.2);
      transition: all 0.3s ease;
    }

    .btn-submit-gopy:hover {
      background: #b00000;
      transform: translateY(-2px);
      box-shadow: 0 6px 15px rgba(212, 0, 0, 0.3);
    }

    .search-container {
      margin-bottom: 15px;
    }

    .search-box {
      width: 100%;
      padding: 12px 15px;
      font-size: 15px;
      border: 1px solid #ddd;
      border-radius: 8px;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .search-box:focus {
      border-color: navy;
    }

    .letters-list {
      max-height: 600px;
      overflow-y: auto;
      border: 1px solid #eee;
      border-radius: 12px;
      padding: 10px;
      background: #fafafa;
    }

    .letter-item {
      background: #fff;
      border: 1px solid #eef2f5;
      border-radius: 10px;
      margin-bottom: 10px;
      overflow: hidden;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

    .letter-item:hover {
      box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    }

    .letter-header {
      padding: 15px 20px;
      background: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: bold;
      font-size: 16px;
      color: #333;
      user-select: none;
      transition: background 0.2s ease;
    }

    .letter-header:hover {
      background: #f4f6fb;
    }

    .letter-header .letter-title {
      flex: 1;
      padding-right: 15px;
    }

    .letter-header .badge {
      background: #e2f9e9;
      color: #1e7e34;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: bold;
      white-space: nowrap;
    }

    .letter-header::after {
      content: '▼';
      font-size: 12px;
      color: #888;
      transition: transform 0.2s ease;
      margin-left: 10px;
    }

    .letter-item.active .letter-header::after {
      transform: rotate(180deg);
    }

    .letter-body {
      max-height: 0;
      opacity: 0;
      padding: 0 20px;
      overflow: hidden;
      border-top: 0 solid #f1f1f1;
      background: #fcfdfe;
      transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.3s ease, border-top-width 0.3s ease;
    }

    .letter-item.active .letter-body {
      max-height: 2000px;
      opacity: 1;
      padding: 20px;
      border-top: 1px solid #f1f1f1;
    }

    .gopy-content {
      background: #f8f9fa;
      border-left: 4px solid #6c757d;
      padding: 15px;
      border-radius: 4px;
      margin-bottom: 15px;
    }

    .gopy-content h4 {
      margin: 0 0 8px 0;
      color: #495057;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .gopy-content p {
      margin: 0;
      font-size: 15px;
      line-height: 1.6;
      color: #333;
      text-align: justify;
    }

    .traloi-content {
      background: #edf4fc;
      border-left: 4px solid navy;
      padding: 15px;
      border-radius: 4px;
    }

    .traloi-content h4 {
      margin: 0 0 8px 0;
      color: navy;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .traloi-content p {
      margin: 0;
      font-size: 15px;
      line-height: 1.6;
      color: #111;
      text-align: justify;
    }

    .btn-wrap {
      text-align: center;
      padding-top: 25px;
    }

    .back {
      display: inline-block;
      padding: 12px 25px;
      background: navy;
      color: white;
      text-decoration: none;
      border-radius: 10px;
      font-weight: bold;
      font-size: 16px;
      transition: all 0.2s ease;
    }

    .back:hover {
      opacity: 0.85;
      transform: translateY(-1px);
    }

    @media (max-width: 600px) {
      .container {
        padding: 10px;
      }

      h1 {
        font-size: 26px;
      }

      .subtitle {
        font-size: 14px;
        margin-bottom: 15px;
      }

      .section-title {
        font-size: 18px;
      }

      .letter-header {
        font-size: 14px;
        padding: 12px 15px;
      }

      .gopy-content p, .traloi-content p {
        font-size: 14px;
      }

      .banner {
        height: 160px;
      }
    }