/* Tổng quan và biến */
    :root {
      --page-app-bg-color: #000;
      --page-app-text-color: #FFF;
      --page-app-accent-color: #FFD700; /* Vàng */
      --page-app-border-radius: 8px;
      --page-app-padding-section: 40px 20px;
      --page-app-padding-mobile: 20px 15px;
    }

    .page-app {
      background-color: var(--page-app-bg-color);
      color: var(--page-app-text-color);
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
    }

    .page-app__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .page-app__section {
      padding: var(--page-app-padding-section);
      text-align: center;
    }

    .page-app__heading-primary {
      font-size: 2.8em;
      color: var(--page-app-accent-color);
      margin-bottom: 20px;
      text-transform: uppercase;
      font-weight: 700;
      line-height: 1.2;
    }

    .page-app__heading-secondary {
      font-size: 2.2em;
      color: var(--page-app-text-color);
      margin-bottom: 15px;
      font-weight: 600;
      line-height: 1.3;
    }

    .page-app__heading-tertiary {
      font-size: 1.8em;
      color: var(--page-app-accent-color);
      margin-bottom: 10px;
      font-weight: 500;
      line-height: 1.4;
    }

    .page-app__paragraph {
      font-size: 1.1em;
      margin-bottom: 15px;
      color: var(--page-app-text-color);
    }

    .page-app__button {
      display: inline-block;
      background-color: var(--page-app-accent-color);
      color: var(--page-app-bg-color);
      padding: 12px 25px;
      border-radius: var(--page-app-border-radius);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
      margin-top: 20px;
    }

    .page-app__button:hover {
      background-color: #E6B800;
      transform: translateY(-2px);
    }

    .page-app__image {
      max-width: 100%;
      height: auto;
      border-radius: var(--page-app-border-radius);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      vertical-align: middle;
      object-fit: cover;
    }

    .page-app__image-wrapper {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
      display: flex;
      justify-content: center;
      align-items: center;
      margin: 20px auto;
    }

    /* Hero Section */
    .page-app__hero-section {
      padding-top: 160px; /* An toàn cho header cố định */
      background-color: #111;
      position: relative;
      overflow: hidden;
    }

    .page-app__hero-content {
      position: relative;
      z-index: 2;
      padding: 40px 20px;
      text-align: center;
    }

    .page-app__hero-image {
      width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
      border-radius: 0; /* Hero image không cần bo góc */
    }

    /* Floating Login Button */
    .page-app__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: #FF4500; /* Màu cam nổi bật */
      color: #FFF;
      padding: 15px 25px;
      border-radius: 50px;
      font-weight: bold;
      font-size: 1.2em;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      cursor: pointer;
      border: none;
      text-align: center;
      transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .page-app__floating-button:hover {
      background-color: #E03E00;
      transform: translateY(-3px);
    }

    /* Download Steps */
    .page-app__steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .page-app__step-item {
      background-color: #1a1a1a;
      padding: 30px;
      border-radius: var(--page-app-border-radius);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
      text-align: left;
      transition: transform 0.3s ease;
    }

    .page-app__step-item:hover {
      transform: translateY(-5px);
    }

    .page-app__step-number {
      font-size: 2.5em;
      color: var(--page-app-accent-color);
      font-weight: bold;
      margin-bottom: 15px;
    }

    .page-app__step-title {
      font-size: 1.5em;
      color: var(--page-app-text-color);
      margin-bottom: 10px;
    }

    /* Game Categories */
    .page-app__categories-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }

    .page-app__category-item {
      background-color: #1a1a1a;
      padding: 20px;
      border-radius: var(--page-app-border-radius);
      text-align: center;
      transition: transform 0.3s ease;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    }

    .page-app__category-item:hover {
      transform: translateY(-5px);
    }

    .page-app__category-image {
      width: 100%;
      height: 120px; /* Fixed height for consistency */
      object-fit: contain;
      margin-bottom: 15px;
      border-radius: 4px;
    }

    .page-app__category-title {
      font-size: 1.2em;
      color: var(--page-app-accent-color);
      font-weight: bold;
    }

    /* Game Providers */
    .page-app__providers-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }

    .page-app__provider-item {
      background-color: #1a1a1a;
      padding: 15px;
      border-radius: var(--page-app-border-radius);
      text-align: center;
      transition: transform 0.3s ease;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    }

    .page-app__provider-item:hover {
      transform: scale(1.05);
    }

    .page-app__provider-logo {
      width: 100%;
      height: 80px; /* Fixed height for logos */
      object-fit: contain;
      margin-bottom: 10px;
    }

    .page-app__provider-name {
      font-size: 1em;
      color: var(--page-app-text-color);
      font-weight: 500;
    }

    /* FAQ Section */
    .page-app__faq-section {
      background-color: #0d0d0d;
    }

    .page-app__faq-list {
      margin-top: 30px;
      text-align: left;
    }

    .page-app__faq-item {
      background-color: #1a1a1a;
      margin-bottom: 15px;
      border-radius: var(--page-app-border-radius);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }

    .page-app__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #222;
      color: var(--page-app-text-color);
      cursor: pointer;
      user-select: none;
      font-size: 1.2em;
      font-weight: bold;
      transition: background-color 0.3s ease;
    }

    .page-app__faq-question:hover {
      background-color: #333;
    }

    .page-app__faq-question h3 {
      margin: 0;
      color: var(--page-app-text-color);
      font-size: 1.2em;
      pointer-events: none; /* Ngăn chặn sự kiện click trên h3 */
    }

    .page-app__faq-toggle {
      font-size: 1.8em;
      line-height: 1;
      color: var(--page-app-accent-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Ngăn chặn sự kiện click trên toggle */
    }

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

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

    .page-app__faq-item.active .page-app__faq-answer {
      max-height: 2000px !important; /* Đảm bảo đủ cao cho mọi nội dung */
      padding: 20px !important;
      opacity: 1;
    }

    /* Responsive */
    @media (max-width: 768px) {
      .page-app__hero-section {
        padding-top: 10px; /* Adjust for smaller mobile headers */
      }
      .page-app__section {
        padding: var(--page-app-padding-mobile);
      }

      .page-app__heading-primary {
        font-size: 2em;
      }

      .page-app__heading-secondary {
        font-size: 1.8em;
      }

      .page-app__heading-tertiary {
        font-size: 1.5em;
      }

      .page-app__paragraph {
        font-size: 1em;
      }

      .page-app__button {
        padding: 10px 20px;
        font-size: 1em;
      }

      .page-app__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }

      .page-app__image-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
      .page-app__image {
        max-width: 100% !important;
        height: auto !important;
      }

      .page-app__categories-grid,
      .page-app__providers-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 15px;
      }

      .page-app__category-image {
        height: 80px;
      }

      .page-app__provider-logo {
        height: 60px;
      }

      .page-app__faq-question {
        padding: 12px 15px;
        font-size: 1em;
      }

      .page-app__faq-question h3 {
        font-size: 1em;
      }

      .page-app__faq-answer {
        padding: 0 15px;
      }

      .page-app__faq-item.active .page-app__faq-answer {
        padding: 15px !important;
      }
    }