:root {
      --page-billionaire88-primary-color: #e44d26; /* Cam đậm */
      --page-billionaire88-secondary-color: #333; /* Đen xám */
      --page-billionaire88-accent-color: #f7b731; /* Vàng cam */
      --page-billionaire88-text-light: #fff;
      --page-billionaire88-text-dark: #333;
      --page-billionaire88-bg-light: #f4f4f4;
      --page-billionaire88-bg-dark: #222;
      --page-billionaire88-border-radius: 8px;
      --page-billionaire88-padding-small: 10px;
      --page-billionaire88-padding-medium: 15px;
      --page-billionaire88-padding-large: 20px;
    }

    .page-billionaire88 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-billionaire88-text-dark);
      background-color: var(--page-billionaire88-bg-light);
      padding-bottom: 80px; /* Space for floating buttons */
    }

    .page-billionaire88__section {
      padding: var(--page-billionaire88-padding-large) var(--page-billionaire88-padding-medium);
      margin-bottom: var(--page-billionaire88-padding-medium);
      background-color: #fff;
      border-radius: var(--page-billionaire88-border-radius);
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
      text-align: center;
    }

    .page-billionaire88__section--dark {
      background-color: var(--page-billionaire88-bg-dark);
      color: var(--page-billionaire88-text-light);
      box-shadow: none;
    }

    .page-billionaire88__section--dark h2,
    .page-billionaire88__section--dark h3 {
      color: var(--page-billionaire88-accent-color);
    }

    .page-billionaire88__header {
      text-align: center;
      padding: var(--page-billionaire88-padding-large);
      background-color: var(--page-billionaire88-primary-color);
      color: var(--page-billionaire88-text-light);
      border-radius: var(--page-billionaire88-border-radius);
      margin-bottom: var(--page-billionaire88-padding-medium);
      position: relative;
    }

    .page-billionaire88__header h1 {
      font-size: 2.2em;
      margin-bottom: 10px;
      color: var(--page-billionaire88-text-light);
    }

    .page-billionaire88__header p {
      font-size: 1.1em;
      margin-bottom: 20px;
    }

    .page-billionaire88__logo-img {
      max-width: 150px;
      height: auto;
      margin-bottom: 15px;
    }

    .page-billionaire88__cta-buttons {
      display: flex;
      justify-content: center;
      gap: 15px;
      margin-top: 20px;
    }

    .page-billionaire88__button {
      display: inline-block;
      padding: var(--page-billionaire88-padding-small) var(--page-billionaire88-padding-medium);
      background-color: var(--page-billionaire88-accent-color);
      color: var(--page-billionaire88-text-dark);
      text-decoration: none;
      border-radius: var(--page-billionaire88-border-radius);
      font-weight: bold;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-billionaire88__button:hover {
      background-color: #e0a325;
      color: var(--page-billionaire88-text-dark);
    }

    .page-billionaire88__button--primary {
      background-color: var(--page-billionaire88-primary-color);
      color: var(--page-billionaire88-text-light);
    }

    .page-billionaire88__button--primary:hover {
      background-color: #c7411f;
      color: var(--page-billionaire88-text-light);
    }

    .page-billionaire88__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      gap: var(--page-billionaire88-padding-medium);
      margin-top: var(--page-billionaire88-padding-large);
    }

    .page-billionaire88__game-card {
      background-color: var(--page-billionaire88-bg-light);
      border-radius: var(--page-billionaire88-border-radius);
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
      text-align: center;
      padding: var(--page-billionaire88-padding-small);
      transition: transform 0.2s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--page-billionaire88-text-dark);
      text-decoration: none;
    }

    .page-billionaire88__game-card:hover {
      transform: translateY(-5px);
    }

    .page-billionaire88__game-card img {
      width: 100%;
      max-width: 120px;
      height: auto;
      border-radius: var(--page-billionaire88-border-radius);
      margin-bottom: 10px;
    }

    .page-billionaire88__game-card h3 {
      font-size: 1.1em;
      margin: 0;
      color: var(--page-billionaire88-primary-color);
    }

    .page-billionaire88__promo-list {
      list-style: none;
      padding: 0;
      text-align: left;
    }

    .page-billionaire88__promo-list li {
      background-color: #f9f9f9;
      margin-bottom: 10px;
      padding: var(--page-billionaire88-padding-small);
      border-left: 5px solid var(--page-billionaire88-accent-color);
      border-radius: 4px;
      display: flex;
      align-items: center;
    }

    .page-billionaire88__promo-list li strong {
      color: var(--page-billionaire88-primary-color);
      margin-right: 5px;
    }

    .page-billionaire88__payment-methods,
    .page-billionaire88__providers {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: var(--page-billionaire88-padding-medium);
    }

    .page-billionaire88__icon {
      width: 60px;
      height: 40px;
      object-fit: contain;
      filter: grayscale(100%);
      opacity: 0.7;
      transition: filter 0.3s ease, opacity 0.3s ease;
    }

    .page-billionaire88__icon:hover {
      filter: grayscale(0%);
      opacity: 1;
    }

    .page-billionaire88__floating-buttons {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      display: flex;
      justify-content: space-around;
      padding: var(--page-billionaire88-padding-small);
      background-color: var(--page-billionaire88-primary-color);
      box-shadow: 0 -2px 10px rgba(0,0,0,0.2);
      z-index: 1000;
    }

    .page-billionaire88__floating-buttons .page-billionaire88__button {
      flex: 1;
      margin: 0 5px;
      padding: var(--page-billionaire88-padding-small) 0;
      font-size: 1.1em;
      background-color: var(--page-billionaire88-accent-color);
      color: var(--page-billionaire88-text-dark);
    }

    .page-billionaire88__floating-buttons .page-billionaire88__button--login {
      background-color: #fff;
      color: var(--page-billionaire88-primary-color);
    }

    @media (min-width: 768px) {
      .page-billionaire88__section {
        max-width: 960px;
        margin-left: auto;
        margin-right: auto;
        padding: var(--page-billionaire88-padding-large) 40px;
      }

      .page-billionaire88__header {
        max-width: 960px;
        margin-left: auto;
        margin-right: auto;
      }

      .page-billionaire88__game-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      }

      .page-billionaire88__floating-buttons {
        display: none; /* Hide on desktop */
      }
    }