:root {
      --page-tk88-primary-color: #e44d26; /* Cam */
      --page-tk88-secondary-color: #333; /* Đen xám */
      --page-tk88-accent-color: #ffcc00; /* Vàng */
      --page-tk88-background-dark: #1a1a1a; /* Nền tối */
      --page-tk88-background-light: #f5f5f5; /* Nền sáng */
      --page-tk88-text-color-light: #fff; /* Chữ sáng */
      --page-tk88-text-color-dark: #333; /* Chữ tối */
      --page-tk88-border-radius: 8px;
      --page-tk88-spacing-unit: 1rem;
    }

    .page-tk88 {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: var(--page-tk88-text-color-light);
      background-color: var(--page-tk88-background-dark);
      margin: 0;
      padding: 0;
    }

    .page-tk88__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: var(--page-tk88-spacing-unit);
    }

    /* Hero Section */
    .page-tk88__hero-section {
      position: relative;
      background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('[GALLERY:banner:tk88,hero,casino]') no-repeat center center/cover;
      color: var(--page-tk88-text-color-light);
      text-align: center;
      padding: 10px 0 60px 0; /* Adjusted padding-top for fixed header */
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 300px;
    }

    .page-tk88__hero-content {
      padding: var(--page-tk88-spacing-unit);
      max-width: 900px;
    }

    .page-tk88__main-title {
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
      color: var(--page-tk88-accent-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-tk88__hero-subtitle {
      font-size: 1.2rem;
      margin-bottom: 1.5rem;
      color: #ccc;
    }

    /* Floating Button */
    .page-tk88__floating-button {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background-color: var(--page-tk88-primary-color);
      color: var(--page-tk88-text-color-light);
      padding: 15px 30px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1rem;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      transition: background-color 0.3s ease, transform 0.3s ease;
      white-space: nowrap;
      text-align: center;
      display: block; /* Ensure it takes full width on mobile if needed */
      width: fit-content;
      max-width: 90%; /* Prevent overflow on very small screens */
    }

    .page-tk88__floating-button:hover {
      background-color: #c23b1c;
      transform: translateX(-50%) scale(1.05);
    }

    /* Sections */
    .page-tk88__section {
      padding: calc(2 * var(--page-tk88-spacing-unit)) var(--page-tk88-spacing-unit);
      text-align: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .page-tk88__section--alt {
      background-color: var(--page-tk88-secondary-color);
    }

    .page-tk88__section-title {
      font-size: 2rem;
      margin-bottom: calc(1.5 * var(--page-tk88-spacing-unit));
      color: var(--page-tk88-accent-color);
    }

    .page-tk88__text-block {
      max-width: 800px;
      margin: 0 auto 2rem auto;
      font-size: 1.1rem;
      color: #ddd;
    }

    /* Game Grid */
    .page-tk88__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: var(--page-tk88-spacing-unit);
      margin-top: calc(2 * var(--page-tk88-spacing-unit));
    }

    .page-tk88__game-item {
      background-color: #2a2a2a;
      border-radius: var(--page-tk88-border-radius);
      overflow: hidden;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      transition: transform 0.3s ease;
      text-align: center;
      padding-bottom: var(--page-tk88-spacing-unit);
    }

    .page-tk88__game-item:hover {
      transform: translateY(-5px);
    }

    .page-tk88__game-image {
      width: 100%;
      max-width: 100%;
      height: 150px; /* Fixed height for consistency */
      object-fit: cover;
      display: block;
      border-bottom: 3px solid var(--page-tk88-primary-color);
    }

    .page-tk88__game-title {
      font-size: 1.1rem;
      font-weight: bold;
      margin-top: var(--page-tk88-spacing-unit);
      color: var(--page-tk88-text-color-light);
    }

    /* How-to Steps */
    .page-tk88__steps-list {
      list-style: none;
      padding: 0;
      margin-top: 2rem;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 2rem;
    }

    .page-tk88__step-item {
      background-color: #2a2a2a;
      padding: 1.5rem;
      border-radius: var(--page-tk88-border-radius);
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
      flex: 1;
      min-width: 280px;
      max-width: 350px;
      text-align: left;
      border-left: 5px solid var(--page-tk88-primary-color);
    }

    .page-tk88__step-item h3 {
      color: var(--page-tk88-accent-color);
      margin-top: 0;
      font-size: 1.3rem;
    }

    .page-tk88__step-item p {
      color: #ccc;
      font-size: 1rem;
    }

    /* Promotions */
    .page-tk88__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: var(--page-tk88-spacing-unit);
      margin-top: calc(2 * var(--page-tk88-spacing-unit));
    }

    .page-tk88__promo-card {
      background-color: #2a2a2a;
      border-radius: var(--page-tk88-border-radius);
      padding: 1.5rem;
      text-align: left;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
      border-top: 5px solid var(--page-tk88-accent-color);
    }

    .page-tk88__promo-card h3 {
      color: var(--page-tk88-primary-color);
      margin-top: 0;
      font-size: 1.3rem;
    }

    .page-tk88__promo-card p {
      color: #ccc;
      font-size: 1rem;
    }

    /* FAQ Section */
    .page-tk88__faq-section {
      padding: calc(2 * var(--page-tk88-spacing-unit)) var(--page-tk88-spacing-unit);
      background-color: var(--page-tk88-background-dark);
    }

    .page-tk88__faq-title {
      font-size: 2rem;
      color: var(--page-tk88-accent-color);
      text-align: center;
      margin-bottom: calc(2 * var(--page-tk88-spacing-unit));
    }

    .page-tk88__faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .page-tk88__faq-item {
      background-color: #2a2a2a;
      margin-bottom: 10px;
      border-radius: var(--page-tk88-border-radius);
      overflow: hidden;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    .page-tk88__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #333;
      color: var(--page-tk88-text-color-light);
      cursor: pointer;
      user-select: none;
      font-size: 1.1rem;
      font-weight: bold;
      transition: background-color 0.3s ease;
    }

    .page-tk88__faq-question:hover {
      background-color: #444;
    }

    .page-tk88__faq-question h3 {
      margin: 0;
      font-size: 1.1rem;
      color: var(--page-tk88-text-color-light);
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-tk88__faq-toggle {
      font-size: 1.5rem;
      font-weight: bold;
      color: var(--page-tk88-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-tk88__faq-item.active .page-tk88__faq-toggle {
      transform: rotate(45deg); /* Change + to X or - */
    }

    .page-tk88__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px;
      color: #ccc;
      font-size: 1rem;
      background-color: #2a2a2a;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
    }

    .page-tk88__faq-item.active .page-tk88__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 15px !important;
      opacity: 1;
    }

    /* CTA Section */
    .page-tk88__cta-section {
      background-color: var(--page-tk88-primary-color);
      color: var(--page-tk88-text-color-light);
      padding: calc(3 * var(--page-tk88-spacing-unit)) var(--page-tk88-spacing-unit);
      text-align: center;
    }

    .page-tk88__cta-title {
      font-size: 2.2rem;
      margin-bottom: var(--page-tk88-spacing-unit);
    }

    .page-tk88__cta-description {
      font-size: 1.2rem;
      margin-bottom: calc(2 * var(--page-tk88-spacing-unit));
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-tk88__cta-button {
      background-color: var(--page-tk88-accent-color);
      color: var(--page-tk88-text-color-dark);
      padding: 15px 40px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2rem;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      transition: background-color 0.3s ease, transform 0.3s ease;
      display: inline-block;
    }

    .page-tk88__cta-button:hover {
      background-color: #e6b800;
      transform: translateY(-3px);
    }

    /* General Image Styling */
    .page-tk88 img {
      max-width: 100%;
      height: auto;
      display: block; /* Remove extra space below images */
      margin: 0 auto; /* Center images */
    }

    .page-tk88__image-container {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
      margin-bottom: var(--page-tk88-spacing-unit);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-tk88__hero-section {
        padding-top: 10px; /* Mobile padding for fixed header */
        min-height: 250px;
      }

      .page-tk88__main-title {
        font-size: 2rem;
      }

      .page-tk88__hero-subtitle {
        font-size: 1rem;
      }

      .page-tk88__section-title {
        font-size: 1.8rem;
      }

      .page-tk88__text-block,
      .page-tk88__step-item p,
      .page-tk88__promo-card p,
      .page-tk88__faq-answer {
        font-size: 0.95rem;
      }

      .page-tk88__game-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
      }

      .page-tk88__game-image {
        height: 120px;
      }

      .page-tk88__game-title {
        font-size: 1rem;
      }

      .page-tk88__floating-button {
        width: 90%;
        font-size: 1rem;
        padding: 12px 20px;
      }

      .page-tk88__step-item {
        min-width: unset;
        width: 100%;
        max-width: 100%;
      }

      .page-tk88__promo-grid {
        grid-template-columns: 1fr;
      }

      .page-tk88__faq-question {
        font-size: 1rem;
        padding: 12px 15px;
      }

      .page-tk88__faq-question h3 {
        font-size: 1rem;
      }

      .page-tk88__faq-toggle {
        font-size: 1.3rem;
      }

      .page-tk88__faq-item.active .page-tk88__faq-answer {
        padding: 15px 15px !important;
      }

      .page-tk88__cta-title {
        font-size: 1.8rem;
      }

      .page-tk88__cta-description {
        font-size: 1rem;
      }

      .page-tk88__cta-button {
        font-size: 1rem;
        padding: 12px 30px;
      }
      /* Force responsive image styles for mobile */
      .page-tk88 img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-tk88__image-container {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }