:root {
      --page-k88-primary-color: #e44d26; /* Màu cam đỏ */
      --page-k88-secondary-color: #ff9800; /* Màu cam */
      --page-k88-accent-color: #4caf50; /* Màu xanh lá */
      --page-k88-text-color: #333;
      --page-k88-light-text-color: #f8f8f8;
      --page-k88-bg-light: #f5f5f5;
      --page-k88-bg-dark: #2c3e50; /* Xám xanh đậm */
      --page-k88-border-color: #ddd;
      --page-k88-transition-speed: 0.3s;
    }

    /* Base styles for the page-k88 */
    .page-k88 {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--page-k88-text-color);
      background-color: var(--page-k88-bg-light);
      padding: 0;
      margin: 0;
    }

    .page-k88__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
      box-sizing: border-box;
    }

    .page-k88__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: #fff;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .page-k88__section--dark {
      background-color: var(--page-k88-bg-dark);
      color: var(--page-k88-light-text-color);
    }

    .page-k88__heading-primary {
      font-size: 2.8em;
      color: var(--page-k88-primary-color);
      text-align: center;
      margin-bottom: 20px;
      line-height: 1.2;
    }

    .page-k88__heading-secondary {
      font-size: 2em;
      color: var(--page-k88-primary-color);
      text-align: center;
      margin-bottom: 30px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-k88__heading-secondary::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 60px;
      height: 4px;
      background-color: var(--page-k88-secondary-color);
      border-radius: 2px;
    }

    .page-k88__heading-tertiary {
      font-size: 1.5em;
      color: var(--page-k88-primary-color);
      margin-bottom: 15px;
    }

    .page-k88__text-center {
      text-align: center;
    }

    /* Hero Section */
    .page-k88__hero-section {
      position: relative;
      width: 100%;
      min-height: 450px;
      background-image: url('[GALLERY:hero:k88,banner,cacuoc]');
      background-size: cover;
      background-position: center;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: var(--page-k88-light-text-color);
      padding-top: 10px; /* For fixed header */
      box-sizing: border-box;
    }

    .page-k88__hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.6);
      z-index: 1;
    }

    .page-k88__hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 20px;
    }

    .page-k88__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
      color: #ffd700; /* Gold */
    }

    .page-k88__hero-subtitle {
      font-size: 1.3em;
      margin-bottom: 30px;
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
    }

    .page-k88__button {
      display: inline-block;
      background-color: var(--page-k88-primary-color);
      color: var(--page-k88-light-text-color);
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color var(--page-k88-transition-speed) ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-k88__button:hover {
      background-color: var(--page-k88-secondary-color);
    }

    .page-k88__button--large {
      padding: 15px 30px;
      font-size: 1.2em;
    }

    /* Floating Login Button */
    .page-k88__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-k88-accent-color);
      color: var(--page-k88-light-text-color);
      padding: 15px 25px;
      border-radius: 50px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
      text-decoration: none;
      font-weight: bold;
      z-index: 1000;
      transition: background-color var(--page-k88-transition-speed) ease;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .page-k88__floating-button:hover {
      background-color: #388e3c;
    }

    .page-k88__floating-button-icon {
      width: 24px;
      height: 24px;
      vertical-align: middle;
      filter: invert(100%) brightness(200%); /* Only for simple icons if needed, but forbidden for content images */
    }

    /* Game Categories */
    .page-k88__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-k88__game-card {
      background-color: var(--page-k88-bg-light);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      transition: transform var(--page-k88-transition-speed) ease, box-shadow var(--page-k88-transition-speed) ease;
      text-align: center;
    }

    .page-k88__game-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-k88__game-card-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      max-width: 100%;
      height: auto;
      display: block;
    }
    .page-k88__game-card-image-container {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-k88__game-card-content {
      padding: 20px;
    }

    .page-k88__game-card-title {
      font-size: 1.4em;
      color: var(--page-k88-primary-color);
      margin-bottom: 10px;
    }

    .page-k88__game-card-description {
      font-size: 0.95em;
      color: #666;
      margin-bottom: 15px;
    }

    /* Guides Section */
    .page-k88__guide-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-k88__guide-item {
      background-color: #fff;
      padding: 25px;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
      text-align: center;
      transition: transform var(--page-k88-transition-speed) ease;
    }

    .page-k88__guide-item:hover {
      transform: translateY(-5px);
    }

    .page-k88__guide-item-title {
      font-size: 1.3em;
      color: var(--page-k88-primary-color);
      margin-bottom: 10px;
    }

    .page-k88__guide-item-text {
      color: #555;
    }

    /* Promotions Section */
    .page-k88__promotion-card {
      background-color: var(--page-k88-secondary-color);
      color: var(--page-k88-light-text-color);
      padding: 30px;
      border-radius: 10px;
      text-align: center;
      margin-top: 30px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    .page-k88__promotion-title {
      font-size: 2.2em;
      margin-bottom: 10px;
      color: #fff;
    }

    .page-k88__promotion-description {
      font-size: 1.1em;
      margin-bottom: 20px;
      line-height: 1.5;
    }

    /* FAQ Section */
    .page-k88__faq-list {
      margin-top: 30px;
    }

    .page-k88__faq-item {
      background-color: #fff;
      border: 1px solid var(--page-k88-border-color);
      border-radius: 8px;
      margin-bottom: 15px;
      overflow: hidden;
    }

    .page-k88__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: var(--page-k88-bg-light);
      cursor: pointer;
      user-select: none;
      transition: background-color var(--page-k88-transition-speed) ease;
    }

    .page-k88__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-k88__faq-question h3 {
      margin: 0;
      font-size: 1.15em;
      color: var(--page-k88-text-color);
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-k88__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-k88-primary-color);
      transition: transform var(--page-k88-transition-speed) ease;
      pointer-events: none; /* Prevent span from blocking click event */
    }

    .page-k88__faq-item.active .page-k88__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' visually */
      color: var(--page-k88-accent-color);
    }
    .page-k88__faq-item.active .page-k88__faq-question {
      background-color: #e0e0e0;
    }

    .page-k88__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: #555;
    }

    .page-k88__faq-item.active .page-k88__faq-answer {
      max-height: 2000px !important; /* Sufficiently large value */
      padding: 20px !important;
      opacity: 1;
    }
    .page-k88__faq-answer p {
      margin-top: 0;
      margin-bottom: 10px;
    }
    .page-k88__faq-answer ul {
      margin-left: 20px;
      margin-bottom: 10px;
    }
    .page-k88__faq-answer li {
      margin-bottom: 5px;
    }


    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-k88__hero-section {
        min-height: 350px;
        padding-top: 10px; /* For fixed header on mobile */
      }

      .page-k88__hero-title {
        font-size: 2em;
      }

      .page-k88__hero-subtitle {
        font-size: 1em;
      }

      .page-k88__button--large {
        padding: 12px 25px;
        font-size: 1em;
      }

      .page-k88__heading-primary {
        font-size: 2em;
      }

      .page-k88__heading-secondary {
        font-size: 1.6em;
      }

      .page-k88__section {
        padding: 30px 15px;
      }

      .page-k88__game-grid {
        grid-template-columns: 1fr;
      }
      .page-k88__guide-list {
        grid-template-columns: 1fr;
      }

      .page-k88__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 0.9em;
      }
      .page-k88__game-card-image {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-k88__game-card-image-container {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
      .page-k88__promotion-title {
        font-size: 1.8em;
      }
      .page-k88__promotion-description {
        font-size: 1em;
      }
      .page-k88__faq-question {
        padding: 12px 15px;
      }
      .page-k88__faq-question h3 {
        font-size: 1em;
      }
      .page-k88__faq-answer {
        padding: 0 15px;
      }
      .page-k88__faq-item.active .page-k88__faq-answer {
        padding: 15px !important;
      }
    }

    @media (max-width: 480px) {
      .page-k88__hero-title {
        font-size: 1.8em;
      }
      .page-k88__hero-subtitle {
        font-size: 0.9em;
      }
    }