.page-app {
      font-family: 'Arial', sans-serif;
      background-color: #000000; /* Đen */
      color: #FFFFFF; /* Trắng */
      line-height: 1.6;
      padding: 20px 0;
    }

    .page-app__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-app__hero-section {
      text-align: center;
      padding-bottom: 40px;
      padding-top: 10px; /* Desktop padding for fixed header */
      position: relative;
      overflow: hidden;
      background-color: #1a1a1a;
      border-radius: 10px;
      margin-bottom: 40px;
    }

    .page-app__hero-image {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 10px;
      margin-bottom: 20px;
    }

    .page-app__hero-content {
      padding: 0 20px;
    }

    .page-app__hero-title {
      font-size: 2.8em;
      color: #FFD700; /* Vàng */
      margin-bottom: 15px;
      line-height: 1.2;
    }

    .page-app__hero-subtitle {
      font-size: 1.3em;
      color: #E0E0E0;
      margin-bottom: 30px;
    }

    .page-app__button {
      display: inline-block;
      background-color: #FFD700; /* Vàng */
      color: #000000; /* Đen */
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      cursor: pointer;
      border: none;
    }

    .page-app__button:hover {
      background-color: #FFA500; /* Cam */
      transform: translateY(-3px);
    }

    .page-app__section {
      background-color: #1a1a1a;
      padding: 40px 20px;
      border-radius: 10px;
      margin-bottom: 30px;
    }

    .page-app__section-title {
      font-size: 2.2em;
      color: #FFD700; /* Vàng */
      text-align: center;
      margin-bottom: 30px;
    }

    .page-app__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
    }

    .page-app__grid-item {
      background-color: #333333;
      padding: 25px;
      border-radius: 10px;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }

    .page-app__grid-item-icon {
      width: 100%;
      max-width: 250px;
      height: auto;
      margin-bottom: 15px;
      display: block;
      margin-left: auto;
      margin-right: auto;
    }

    .page-app__grid-item-title {
      font-size: 1.5em;
      color: #FFD700; /* Vàng */
      margin-bottom: 10px;
    }

    .page-app__grid-item-text {
      color: #E0E0E0;
      font-size: 0.95em;
    }

    .page-app__image-full {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 10px;
      margin: 20px auto;
    }

    .page-app__steps-list {
      list-style: none;
      padding: 0;
      counter-reset: step-counter;
    }

    .page-app__steps-item {
      background-color: #333333;
      margin-bottom: 15px;
      padding: 20px 25px;
      border-radius: 10px;
      display: flex;
      align-items: flex-start;
      gap: 15px;
    }

    .page-app__steps-item::before {
      counter-increment: step-counter;
      content: counter(step-counter);
      background-color: #FFD700;
      color: #000000;
      width: 35px;
      height: 35px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      font-size: 1.2em;
      flex-shrink: 0;
    }

    .page-app__steps-item-content {
      flex-grow: 1;
    }

    .page-app__steps-item-title {
      font-size: 1.3em;
      color: #FFD700;
      margin-top: 0;
      margin-bottom: 5px;
    }

    .page-app__steps-item-text {
      color: #E0E0E0;
    }

    .page-app__game-providers-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      justify-items: center;
    }

    .page-app__provider-item {
      background-color: #333333;
      padding: 15px;
      border-radius: 8px;
      text-align: center;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      transition: transform 0.2s ease;
    }

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

    .page-app__provider-logo {
      width: 100%;
      max-width: 200px;
      height: auto;
      display: block;
      margin: 0 auto 10px auto;
    }

    .page-app__provider-name {
      font-size: 1em;
      color: #FFD700;
      font-weight: bold;
    }

    .page-app__faq-list {
      list-style: none;
      padding: 0;
    }

    .page-app__faq-item {
      background-color: #333333;
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
    }

    .page-app__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: #444444;
      color: #FFD700;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
    }

    .page-app__faq-question:hover {
      background-color: #555555;
    }

    .page-app__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: #FFD700;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-app__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      line-height: 1;
      pointer-events: none; /* Prevent toggle from blocking click event */
      transition: transform 0.3s ease;
    }

    .page-app__faq-item.active .page-app__faq-toggle {
      transform: rotate(45deg); /* Change + to X or - */
    }

    .page-app__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      color: #E0E0E0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
    }

    .page-app__faq-item.active .page-app__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    .page-app__text-center {
      text-align: center;
      margin-top: 30px;
    }

    @media (max-width: 768px) {
      .page-app__hero-section {
        padding-top: 10px; /* Mobile padding for fixed header */
        padding-bottom: 30px;
      }
      .page-app__hero-title {
        font-size: 2em;
      }
      .page-app__hero-subtitle {
        font-size: 1em;
      }
      .page-app__button {
        padding: 12px 25px;
        font-size: 1em;
      }
      .page-app__section {
        padding: 30px 15px;
      }
      .page-app__section-title {
        font-size: 1.8em;
      }
      .page-app__grid-item-title {
        font-size: 1.3em;
      }
      .page-app__steps-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
      }
      .page-app__steps-item::before {
        margin-bottom: 10px;
      }
      .page-app__steps-item-title {
        font-size: 1.1em;
      }
      .page-app__faq-question {
        padding: 15px 20px;
      }
      .page-app__faq-question h3 {
        font-size: 1.1em;
      }
      .page-app__faq-answer {
        padding: 0 20px;
      }
      .page-app__faq-item.active .page-app__faq-answer {
        padding: 15px 20px !important;
      }

      /* Image responsive optimization */
      .page-app img {
          max-width: 100% !important;
          height: auto !important;
      }
      .page-app__container img {
          max-width: 100% !important;
          height: auto !important;
      }
      .page-app__hero-image {
          max-width: 100% !important;
          height: auto !important;
      }
      .page-app__grid-item-icon {
          max-width: 100% !important;
          height: auto !important;
      }
      .page-app__image-full {
          max-width: 100% !important;
          height: auto !important;
      }
      .page-app__provider-logo {
          max-width: 100% !important;
          height: auto !important;
      }
    }