:root {
      --page-tk88app-primary-color: #e44d26; /* Orange-red */
      --page-tk88app-secondary-color: #333;
      --page-tk88app-accent-color: #f7b731; /* Gold */
      --page-tk88app-light-bg: #f9f9f9;
      --page-tk88app-dark-bg: #222;
      --page-tk88app-text-color: #333;
      --page-tk88app-light-text: #fff;
      --page-tk88app-border-radius: 8px;
      --page-tk88app-box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }

    /* Base styles for the page-tk88app */
    .page-tk88app {
      font-family: 'Arial', sans-serif;
      color: var(--page-tk88app-text-color);
      line-height: 1.6;
      background-color: var(--page-tk88app-light-bg);
    }

    .page-tk88app__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: #fff;
      border-radius: var(--page-tk88app-border-radius);
      box-shadow: var(--page-tk88app-box-shadow);
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-tk88app__section-title {
      font-size: 2.5em;
      color: var(--page-tk88app-primary-color);
      text-align: center;
      margin-bottom: 30px;
      position: relative;
      padding-bottom: 15px;
    }

    .page-tk88app__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-tk88app-accent-color);
      border-radius: 2px;
    }

    .page-tk88app__text-center {
      text-align: center;
    }

    .page-tk88app__primary-button {
      display: inline-block;
      background-color: var(--page-tk88app-primary-color);
      color: var(--page-tk88app-light-text);
      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;
      text-align: center;
      border: none;
      cursor: pointer;
    }

    .page-tk88app__primary-button:hover {
      background-color: #c0392b; /* Darker red */
      transform: translateY(-3px);
    }

    /* Hero Section */
    .page-tk88app__hero-section {
      position: relative;
      width: 100%;
      overflow: hidden;
      padding-top: 10px; /* Crucial for fixed header */
      margin-bottom: 20px;
      background-color: var(--page-tk88app-dark-bg);
      color: var(--page-tk88app-light-text);
      text-align: center;
    }

    .page-tk88app__hero-image {
      width: 100%;
      height: auto;
      display: block;
      max-width: 100%;
      object-fit: cover;
      filter: brightness(0.7); /* Allowed for darkening, not color change */
    }

    .page-tk88app__hero-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 10;
      width: 90%;
      max-width: 800px;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.5);
      border-radius: var(--page-tk88app-border-radius);
    }

    .page-tk88app__hero-title {
      font-size: 3em;
      margin-bottom: 15px;
      color: var(--page-tk88app-accent-color);
      line-height: 1.2;
    }

    .page-tk88app__hero-description {
      font-size: 1.2em;
      margin-bottom: 30px;
      color: #eee;
    }

    /* Download Guide */
    .page-tk88app__download-guide {
      text-align: center;
    }

    .page-tk88app__download-steps {
      display: flex;
      justify-content: center;
      gap: 30px;
      flex-wrap: wrap;
      margin-top: 40px;
    }

    .page-tk88app__step-item {
      background-color: var(--page-tk88app-light-bg);
      padding: 25px;
      border-radius: var(--page-tk88app-border-radius);
      box-shadow: var(--page-tk88app-box-shadow);
      flex: 1;
      min-width: 280px;
      max-width: 350px;
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-tk88app__step-item:hover {
      transform: translateY(-5px);
    }

    .page-tk88app__step-number {
      font-size: 2em;
      font-weight: bold;
      color: var(--page-tk88app-primary-color);
      margin-bottom: 15px;
      display: block;
    }

    .page-tk88app__step-title {
      font-size: 1.5em;
      color: var(--page-tk88app-secondary-color);
      margin-bottom: 10px;
    }

    .page-tk88app__qr-code {
      width: 250px;
      height: 250px;
      max-width: 100%;
      height: auto;
      margin: 20px auto 0;
      border: 5px solid var(--page-tk88app-primary-color);
      border-radius: var(--page-tk88app-border-radius);
      display: block;
    }

    /* Game Showcase */
    .page-tk88app__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 40px;
    }

    .page-tk88app__game-card {
      background-color: var(--page-tk88app-light-bg);
      border-radius: var(--page-tk88app-border-radius);
      box-shadow: var(--page-tk88app-box-shadow);
      overflow: hidden;
      text-align: center;
      transition: transform 0.3s ease;
    }

    .page-tk88app__game-card:hover {
      transform: translateY(-5px);
    }

    .page-tk88app__game-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      max-width: 100%;
    }

    .page-tk88app__game-name {
      font-size: 1.3em;
      color: var(--page-tk88app-secondary-color);
      padding: 15px;
      font-weight: bold;
    }

    /* Benefits Section */
    .page-tk88app__benefits-list {
      list-style: none;
      padding: 0;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .page-tk88app__benefit-item {
      background-color: var(--page-tk88app-light-bg);
      padding: 25px;
      border-left: 5px solid var(--page-tk88app-primary-color);
      border-radius: var(--page-tk88app-border-radius);
      box-shadow: var(--page-tk88app-box-shadow);
      transition: border-color 0.3s ease;
    }

    .page-tk88app__benefit-item:hover {
      border-color: var(--page-tk88app-accent-color);
    }

    .page-tk88app__benefit-title {
      font-size: 1.4em;
      color: var(--page-tk88app-primary-color);
      margin-bottom: 10px;
    }

    /* Promotion Section */
    .page-tk88app__promotion-card {
      background-color: var(--page-tk88app-primary-color);
      color: var(--page-tk88app-light-text);
      padding: 40px;
      border-radius: var(--page-tk88app-border-radius);
      text-align: center;
      box-shadow: var(--page-tk88app-box-shadow);
    }

    .page-tk88app__promotion-title {
      font-size: 2.8em;
      margin-bottom: 15px;
      color: var(--page-tk88app-accent-color);
    }

    .page-tk88app__promotion-description {
      font-size: 1.3em;
      margin-bottom: 30px;
    }

    /* FAQ Section */
    .page-tk88app__faq-list {
      margin-top: 30px;
    }

    .page-tk88app__faq-item {
      background-color: var(--page-tk88app-light-bg);
      margin-bottom: 15px;
      border-radius: var(--page-tk88app-border-radius);
      box-shadow: var(--page-tk88app-box-shadow);
      overflow: hidden;
    }

    .page-tk88app__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      background-color: #f0f0f0;
      cursor: pointer;
      user-select: none;
      border-bottom: 1px solid #eee;
      transition: background-color 0.3s ease;
    }

    .page-tk88app__faq-question:hover {
      background-color: #e0e0e0;
    }

    .page-tk88app__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-tk88app-secondary-color);
      pointer-events: none; /* Prevent text selection interfering with click */
    }

    .page-tk88app__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-tk88app-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent icon interfering with click */
    }

    .page-tk88app__faq-item.active .page-tk88app__faq-toggle {
      transform: rotate(45deg); /* Plus to X effect */
    }

    .page-tk88app__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      color: var(--page-tk88app-text-color);
    }

    .page-tk88app__faq-item.active .page-tk88app__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    /* Floating Button */
    .page-tk88app__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      animation: page-tk88app__pulse 2s infinite;
    }

    .page-tk88app__floating-button a {
      background-color: var(--page-tk88app-accent-color);
      color: var(--page-tk88app-dark-bg);
      padding: 15px 25px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
      display: flex;
      align-items: center;
      gap: 10px;
      transition: background-color 0.3s ease;
    }

    .page-tk88app__floating-button a:hover {
      background-color: #f5a623;
    }

    @keyframes page-tk88app__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .page-tk88app__hero-section {
        padding-top: 10px !important; /* Ensure padding for fixed header on mobile */
      }
      .page-tk88app__hero-title {
        font-size: 2em;
      }
      .page-tk88app__hero-description {
        font-size: 1em;
      }
      .page-tk88app__section-title {
        font-size: 2em;
      }
      .page-tk88app__section {
        padding: 20px 15px;
      }
      .page-tk88app__download-steps {
        flex-direction: column;
        align-items: center;
      }
      .page-tk88app__step-item {
        min-width: unset;
        width: 100%;
      }
      .page-tk88app__game-grid {
        grid-template-columns: 1fr;
      }
      .page-tk88app__benefits-list {
        grid-template-columns: 1fr;
      }
      .page-tk88app__promotion-title {
        font-size: 2em;
      }
      .page-tk88app__promotion-description {
        font-size: 1em;
      }
      .page-tk88app__faq-question {
        padding: 15px 20px;
      }
      .page-tk88app__faq-question h3 {
        font-size: 1.1em;
      }
      .page-tk88app__faq-answer {
        padding: 0 20px;
      }
      .page-tk88app__faq-item.active .page-tk88app__faq-answer {
        padding: 15px 20px !important;
      }
      .page-tk88app__floating-button {
        bottom: 15px;
        right: 15px;
        left: 15px; /* Center for mobile */
        text-align: center;
      }
      .page-tk88app__floating-button a {
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
        font-size: 1em;
      }
      /* Image responsive optimization */
      .page-tk88app img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-tk88app__qr-code {
        width: 200px;
        height: 200px;
      }
    }