* { box-sizing: border-box; }
    body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 20px;
      background: #13134a;
    }
    h1 { text-align: center; color: #e0e0e0; }

    .guide-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
      max-width: 800px;
      margin: auto;
    }

    .guide-card {
      background: #2b2b3d;
      border-radius: 10px;
      padding: 20px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.3);
      transition: transform 0.2s ease;
      border: 1px solid #ddd;
    }

    .guide-card:hover { transform: translateY(-2px); }

    .guide-title {
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 8px;
      color: #90caf9;
    }

    .guide-content {
      font-size: 15px;
      color: #d3d3d3;
      line-height: 1.6;
    }

    .guide-time {
      font-size: 10px;
      color: #a0a0a0;
      text-align: right;
    }

    .home-button {
      display: inline-block;
      background-color: #26a69a;
      color: white;
      padding: 10px 16px;
      text-decoration: none;
      border-radius: 8px;
      font-size: 16px;
      font-weight: bold;
      transition: background-color 0.3s ease;
      margin-bottom: 20px;
      text-align: center;
    }

    .home-button:hover { background-color: #1e827a; }

    a {
      color: #80d8ff;
      text-decoration: none;
      transition: color 0.3s ease;
    }

    a:hover {
      color: #40c4ff;
      text-decoration: underline;
    }

    @media (max-width: 600px) {
      .guide-card { padding: 15px; }
      .guide-title { font-size: 20px; }
      .guide-content { font-size: 14px; }
    }

    .content-collapsed {
      max-height: 70px;
      overflow: hidden;
      position: relative;
      margin-bottom: 14px;
      border-radius: 9px;
    }

    .content-collapsed::after {
      content: '';
      position: absolute;
      bottom: 0; left: 0; right: 0;
      height: 60px;
      background: linear-gradient(to bottom, transparent, black);
      border-radius: 9px;
    }

    .toggle-btn {
      margin: 5px 0;
      background:linear-gradient(90deg, #17d39f, #3b4a4b);
      color: white;
      border: none;
      padding: 6px 12px;
      border-radius: 10px;
      cursor: pointer;
    }

    form {
      text-align: center;
      margin: 20px auto;
      max-width: 600px;
    }

    input[type="text"] {
      width: 100%;
      padding: 10px;
      font-size: 16px;
      border: 1px solid #ccc;
      border-radius: 5px;
    }

    .pagination {
      text-align: center;
      margin-top: 30px;
    }
    .search-button {
  margin-top: 10px;
  padding: 10px 20px;
  font-size: 16px;
  background: linear-gradient(90deg, #00c6ff, #0072ff); /* Xanh gradient */
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.3s ease, transform 0.2s ease;
}

.search-button:hover {
  background: linear-gradient(90deg, #0072ff, #00c6ff);
  transform: translateY(-2px);
}

.search-button:active {
  transform: scale(0.98);
}
.gioi-thieu {
  background-color: #1e1e2f;
  color: #ffffff;
  padding: 20px;
  border-radius: 12px;
  font-size: 16px;
  line-height: 1.6;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  margin-bottom: 20px;
  max-width: 800px;
  margin: auto;
}
.gioi-thieu strong {
  color: #00bfff; /* màu nổi bật cho tên app */
}