/* Tổng quan */
    .page-xocdiaapp {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #333;
      line-height: 1.6;
      background-color: #f5f5f5;
      padding-bottom: 80px; /* Khoảng trống cho nút nổi */
    }

    .page-xocdiaapp__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-xocdiaapp__section {
      background-color: #fff;
      margin-bottom: 20px;
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .page-xocdiaapp__section:last-of-type {
      margin-bottom: 0;
    }

    .page-xocdiaapp__heading-primary {
      color: #c0392b;
      text-align: center;
      margin-bottom: 20px;
      font-size: 2.5em;
      font-weight: bold;
    }

    .page-xocdiaapp__heading-secondary {
      color: #d35400;
      margin-top: 30px;
      margin-bottom: 15px;
      font-size: 2em;
      border-bottom: 2px solid #e67e22;
      padding-bottom: 10px;
    }

    .page-xocdiaapp__heading-tertiary {
      color: #e67e22;
      margin-top: 20px;
      margin-bottom: 10px;
      font-size: 1.5em;
    }

    /* Hero Section */
    .page-xocdiaapp__hero-section {
      position: relative;
      background-color: #2c3e50;
      color: #fff;
      text-align: center;
      padding-top: 10px; /* Khoảng cách từ đầu trang để tránh header cố định */
      padding-bottom: 50px;
      overflow: hidden;
      border-radius: 0 0 15px 15px;
      margin-bottom: 20px;
    }

    .page-xocdiaapp__hero-image {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto 20px auto;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    }

    .page-xocdiaapp__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .page-xocdiaapp__hero-subtitle {
      font-size: 1.5em;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Nút hành động chính */
    .page-xocdiaapp__main-cta {
      display: inline-block;
      background-color: #e74c3c;
      color: #fff;
      padding: 15px 30px;
      border-radius: 50px;
      font-size: 1.3em;
      font-weight: bold;
      text-decoration: none;
      transition: background-color 0.3s ease, transform 0.3s ease;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
      border: none;
      cursor: pointer;
    }

    .page-xocdiaapp__main-cta:hover {
      background-color: #c0392b;
      transform: translateY(-3px);
    }

    /* Nút nổi đăng nhập */
    .page-xocdiaapp__floating-button {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background-color: #f39c12;
      color: #fff;
      padding: 12px 25px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      text-decoration: none;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      animation: page-xocdiaapp__pulse 2s infinite;
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .page-xocdiaapp__floating-button:hover {
      background-color: #e67e22;
      animation: none;
    }

    @keyframes page-xocdiaapp__pulse {
      0% { transform: translateX(-50%) scale(1); }
      50% { transform: translateX(-50%) scale(1.05); }
      100% { transform: translateX(-50%) scale(1); }
    }

    /* Danh sách tính năng/lợi ích */
    .page-xocdiaapp__feature-list {
      list-style: none;
      padding: 0;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .page-xocdiaapp__feature-item {
      background-color: #ecf0f1;
      padding: 20px;
      border-radius: 8px;
      text-align: center;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      box-sizing: border-box; /* Quan trọng cho responsive */
    }

    .page-xocdiaapp__feature-item strong {
      display: block;
      font-size: 1.2em;
      color: #2c3e50;
      margin-bottom: 10px;
    }

    /* Hướng dẫn tải app */
    .page-xocdiaapp__steps-list {
      list-style: none;
      padding: 0;
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
      margin-top: 20px;
    }

    .page-xocdiaapp__step-item {
      background-color: #ecf0f1;
      padding: 25px;
      border-radius: 8px;
      text-align: center;
      flex: 1 1 calc(33% - 20px); /* 3 items per row on desktop */
      min-width: 280px; /* Minimum width for item */
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      box-sizing: border-box; /* Quan trọng cho responsive */
    }

    .page-xocdiaapp__step-number {
      background-color: #e74c3c;
      color: #fff;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 1.5em;
      font-weight: bold;
      margin: 0 auto 15px auto;
    }

    .page-xocdiaapp__qr-code {
      max-width: 250px;
      height: auto;
      margin-top: 20px;
      border: 5px solid #eee;
      border-radius: 5px;
    }

    /* Sản phẩm/Trò chơi */
    .page-xocdiaapp__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .page-xocdiaapp__game-card {
      background-color: #fcfcfc;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box; /* Quan trọng cho responsive */
    }

    .page-xocdiaapp__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
    }

    .page-xocdiaapp__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .page-xocdiaapp__game-content {
      padding: 20px;
    }

    .page-xocdiaapp__game-title {
      font-size: 1.3em;
      color: #2c3e50;
      margin-bottom: 10px;
    }

    .page-xocdiaapp__game-description {
      font-size: 0.95em;
      color: #666;
    }

    /* FAQ Section */
    .page-xocdiaapp__faq-list {
      margin-top: 20px;
    }

    .page-xocdiaapp__faq-item {
      background-color: #ecf0f1;
      margin-bottom: 10px;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    }

    .page-xocdiaapp__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #34495e;
      color: #fff;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
    }

    .page-xocdiaapp__faq-question:hover {
      background-color: #2c3e50;
    }

    .page-xocdiaapp__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      flex-grow: 1;
      text-align: left;
      pointer-events: none; /* Ngăn chặn h3 chặn sự kiện click */
    }

    .page-xocdiaapp__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      margin-left: 10px;
      transition: transform 0.3s ease;
      pointer-events: none; /* Ngăn chặn toggle chặn sự kiện click */
    }

    .page-xocdiaapp__faq-item.active .page-xocdiaapp__faq-toggle {
      transform: rotate(45deg); /* Biến '+' thành 'x' hoặc '-' */
    }

    .page-xocdiaapp__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      background-color: #fcfcfc;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      color: #444;
    }

    .page-xocdiaapp__faq-item.active .page-xocdiaapp__faq-answer {
      max-height: 2000px !important; /* Đủ lớn để chứa mọi nội dung */
      padding: 20px !important;
      opacity: 1;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-xocdiaapp__hero-section {
        padding-top: 10px; /* Đảm bảo không bị che bởi header */
        padding-bottom: 30px;
      }
      .page-xocdiaapp__hero-title {
        font-size: 2.2em;
      }
      .page-xocdiaapp__hero-subtitle {
        font-size: 1.2em;
      }
      .page-xocdiaapp__main-cta {
        padding: 12px 25px;
        font-size: 1.1em;
      }
      .page-xocdiaapp__heading-primary {
        font-size: 2em;
      }
      .page-xocdiaapp__heading-secondary {
        font-size: 1.6em;
      }
      .page-xocdiaapp__heading-tertiary {
        font-size: 1.3em;
      }

      .page-xocdiaapp__feature-list {
        grid-template-columns: 1fr; /* Một cột trên di động */
      }
      .page-xocdiaapp__feature-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 15px !important;
      }

      .page-xocdiaapp__steps-list {
        flex-direction: column; /* Xếp chồng các bước */
      }
      .page-xocdiaapp__step-item {
        flex: 1 1 100%;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 20px !important;
      }

      .page-xocdiaapp__game-grid {
        grid-template-columns: 1fr; /* Một cột trên di động */
      }
      .page-xocdiaapp__game-card {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-xocdiaapp__faq-question {
        padding: 12px 15px;
      }
      .page-xocdiaapp__faq-question h3 {
        font-size: 1em;
      }
      .page-xocdiaapp__faq-answer {
        padding: 0 15px;
      }
      .page-xocdiaapp__faq-item.active .page-xocdiaapp__faq-answer {
        padding: 15px !important;
      }

      .page-xocdiaapp__floating-button {
        font-size: 0.9em;
        padding: 10px 20px;
        width: calc(100% - 40px);
        max-width: 350px;
      }
    }

    /* Đảm bảo hình ảnh responsive */
    .page-xocdiaapp img {
      max-width: 100%;
      height: auto;
      display: block;
      box-sizing: border-box;
    }