:root {
      --page-tk88app-primary-color: #e21b2d; /* Đỏ rực */
      --page-tk88app-secondary-color: #ffc107; /* Vàng hổ phách */
      --page-tk88app-background-color: #f8f8f8; /* Nền sáng */
      --page-tk88app-text-color: #333333; /* Văn bản tối */
      --page-tk88app-light-text-color: #ffffff; /* Văn bản sáng */
      --page-tk88app-border-color: #e0e0e0; /* Màu viền */
      --page-tk88app-shadow-color: rgba(0, 0, 0, 0.1);
    }

    .page-tk88app {
      font-family: 'Arial', sans-serif;
      color: var(--page-tk88app-text-color);
      line-height: 1.6;
      background-color: var(--page-tk88app-background-color);
      padding-bottom: 80px; /* Dành chỗ cho nút đăng nhập nổi */
    }

    .page-tk88app-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 1rem;
    }

    /* Hero Section */
    .page-tk88app-hero {
      text-align: center;
      padding: 0; /* Loại bỏ padding để banner sát trên */
      background-color: var(--page-tk88app-primary-color);
      color: var(--page-tk88app-light-text-color);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 60vh; /* Chiều cao tối thiểu cho hero section */
    }

    .page-tk88app-hero-banner {
      width: 100%;
      height: 100%; /* Đảm bảo hình ảnh lấp đầy */
      object-fit: cover; /* Hình ảnh bao phủ toàn bộ vùng */
      position: absolute;
      top: 0;
      left: 0;
      z-index: 1;
    }

    .page-tk88app-hero-content {
      position: relative;
      z-index: 2;
      padding: 1.5rem 1rem;
      background: rgba(0, 0, 0, 0.4); /* Lớp phủ để chữ dễ đọc */
      border-radius: 8px;
      margin: 1rem;
      max-width: 90%;
    }

    .page-tk88app-hero h1 {
      font-size: 2.2rem;
      margin-bottom: 0.8rem;
      color: var(--page-tk88app-light-text-color);
      text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    }
    @media (min-width: 768px) {
      .page-tk88app-hero h1 {
        font-size: 3.5rem;
      }
    }

    .page-tk88app-hero p {
      font-size: 1rem;
      margin-bottom: 1.5rem;
      color: var(--page-tk88app-light-text-color);
    }
    @media (min-width: 768px) {
      .page-tk88app-hero p {
        font-size: 1.2rem;
      }
    }

    .page-tk88app-button {
      display: inline-block;
      background-color: var(--page-tk88app-secondary-color);
      color: var(--page-tk88app-text-color);
      padding: 0.8rem 1.5rem;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease, transform 0.2s ease;
      box-shadow: 0 4px 10px var(--page-tk88app-shadow-color);
      font-size: 1rem;
    }

    .page-tk88app-button:hover {
      background-color: #ffdb58;
      transform: translateY(-2px);
    }

    /* Floating Login Button */
    .page-tk88app-floating-button {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background-color: var(--page-tk88app-primary-color);
      padding: 0.75rem 1rem;
      text-align: center;
      box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
      z-index: 1000;
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 1rem;
    }

    .page-tk88app-floating-button .page-tk88app-button {
      background-color: var(--page-tk88app-secondary-color);
      color: var(--page-tk88app-text-color);
      padding: 0.6rem 1.2rem;
      font-size: 0.9rem;
      border-radius: 30px;
    }

    .page-tk88app-floating-button p {
      color: var(--page-tk88app-light-text-color);
      margin: 0;
      font-size: 0.9rem;
      font-weight: bold;
    }
    @media (min-width: 768px) {
      .page-tk88app-floating-button {
        justify-content: flex-end;
        padding: 0.75rem 2rem;
      }
      .page-tk88app-floating-button p {
        font-size: 1rem;
      }
      .page-tk88app-floating-button .page-tk88app-button {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
      }
    }


    /* Sections */
    .page-tk88app-section {
      padding: 2rem 1rem;
      background-color: var(--page-tk88app-light-text-color);
      margin-bottom: 1rem;
      border-radius: 8px;
      box-shadow: 0 2px 5px var(--page-tk88app-shadow-color);
    }

    .page-tk88app-section h2 {
      font-size: 1.8rem;
      color: var(--page-tk88app-primary-color);
      text-align: center;
      margin-bottom: 1.5rem;
      border-bottom: 2px solid var(--page-tk88app-primary-color);
      padding-bottom: 0.5rem;
    }
    @media (min-width: 768px) {
      .page-tk88app-section h2 {
        font-size: 2.2rem;
      }
    }

    .page-tk88app-section h3 {
      font-size: 1.4rem;
      color: var(--page-tk88app-text-color);
      margin-top: 1.5rem;
      margin-bottom: 1rem;
    }

    .page-tk88app-section p {
      margin-bottom: 1rem;
    }

    /* Game Categories */
    .page-tk88app-game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 1rem;
      margin-top: 1.5rem;
    }
    @media (min-width: 768px) {
      .page-tk88app-game-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      }
    }

    .page-tk88app-game-card {
      background-color: #ffffff;
      border-radius: 8px;
      box-shadow: 0 2px 8px var(--page-tk88app-shadow-color);
      overflow: hidden;
      text-align: center;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 200px;
    }

    .page-tk88app-game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
    }

    .page-tk88app-game-card img {
      width: 100%;
      height: 120px;
      object-fit: cover;
      display: block;
    }

    .page-tk88app-game-card h4 {
      font-size: 1.1rem;
      color: var(--page-tk88app-primary-color);
      padding: 0.8rem 0.5rem;
      margin: 0;
      flex-grow: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .page-tk88app-game-card h4 a {
      color: var(--page-tk88app-primary-color);
      text-decoration: none;
    }
    .page-tk88app-game-card h4 a:hover {
      text-decoration: underline;
    }

    /* Download Section */
    .page-tk88app-download-grid {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
      margin-top: 1.5rem;
    }
    @media (min-width: 768px) {
      .page-tk88app-download-grid {
        flex-direction: row;
        justify-content: space-around;
      }
    }

    .page-tk88app-download-item {
      text-align: center;
      background-color: #ffffff;
      padding: 1.5rem;
      border-radius: 8px;
      box-shadow: 0 2px 8px var(--page-tk88app-shadow-color);
      flex: 1;
      min-width: 280px;
    }

    .page-tk88app-download-item img {
      width: 100px;
      height: 100px;
      margin-bottom: 1rem;
      object-fit: contain;
    }

    .page-tk88app-download-item h3 {
      color: var(--page-tk88app-primary-color);
      margin-top: 0;
    }

    .page-tk88app-download-item ol {
      text-align: left;
      margin: 0 auto;
      padding-left: 1.5rem;
      max-width: 300px;
    }

    .page-tk88app-download-item li {
      margin-bottom: 0.5rem;
      color: var(--page-tk88app-text-color);
    }

    /* Promotions */
    .page-tk88app-promotion-card {
      background-color: var(--page-tk88app-primary-color);
      color: var(--page-tk88app-light-text-color);
      padding: 1.5rem;
      border-radius: 8px;
      text-align: center;
      margin-top: 1.5rem;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    }

    .page-tk88app-promotion-card h3 {
      color: var(--page-tk88app-light-text-color);
      font-size: 1.6rem;
      margin-bottom: 1rem;
    }

    .page-tk88app-promotion-card p {
      font-size: 1.1rem;
      margin-bottom: 1.5rem;
    }

    /* Payment Methods */
    .page-tk88app-payment-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 1rem;
      margin-top: 1.5rem;
    }

    .page-tk88app-payment-item {
      background-color: #ffffff;
      border: 1px solid var(--page-tk88app-border-color);
      border-radius: 8px;
      padding: 0.8rem 1.2rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      box-shadow: 0 1px 3px var(--page-tk88app-shadow-color);
      font-weight: bold;
      color: var(--page-tk88app-text-color);
    }
    .page-tk88app-payment-item img {
      height: 24px;
      width: auto;
      object-fit: contain;
    }

    /* FAQ */
    .page-tk88app-faq-item {
      background-color: #ffffff;
      border: 1px solid var(--page-tk88app-border-color);
      border-radius: 8px;
      margin-bottom: 0.8rem;
      overflow: hidden;
    }

    .page-tk88app-faq-question {
      padding: 1rem 1.2rem;
      background-color: #f0f0f0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: bold;
      color: var(--page-tk88app-text-color);
      transition: background-color 0.3s ease;
    }

    .page-tk88app-faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-tk88app-faq-answer {
      padding: 1rem 1.2rem;
      background-color: #ffffff;
      border-top: 1px solid var(--page-tk88app-border-color);
      display: none;
      color: var(--page-tk88app-text-color);
    }

    .page-tk88app-faq-question.active + .page-tk88app-faq-answer {
      display: block;
    }

    .page-tk88app-faq-question .page-tk88app-icon {
      transition: transform 0.3s ease;
    }

    .page-tk88app-faq-question.active .page-tk88app-icon {
      transform: rotate(180deg);
    }

    /* Social Media */
    .page-tk88app-social-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 1rem;
      margin-top: 1.5rem;
    }

    .page-tk88app-social-item {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background-color: var(--page-tk88app-primary-color);
      color: var(--page-tk88app-light-text-color);
      padding: 0.7rem 1.2rem;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      box-shadow: 0 2px 5px var(--page-tk88app-shadow-color);
    }

    .page-tk88app-social-item:hover {
      background-color: #c21829;
    }

    .page-tk88app-social-item img {
      height: 20px;
      width: auto;
      filter: invert(1); /* Biến icon thành màu trắng */
    }

    /* Responsive adjustments */
    @media (max-width: 767px) {
      .page-tk88app-container {
        padding: 0.5rem;
      }
      .page-tk88app-section {
        padding: 1.5rem 0.8rem;
      }
    }