/* Reset và cơ bản */
    .page-tf88vn {
      font-family: 'Arial', sans-serif;
      line-height: 1.6;
      color: #f0f0f0; /* Light text for dark background */
      background-color: #1a1a1a; /* Dark background */
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      overflow-x: hidden; /* Prevent horizontal scroll */
    }

    .page-tf88vn__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px;
    }

    /* Hero Section */
    .page-tf88vn__hero-section {
      position: relative;
      background-color: #2a2a2a;
      text-align: center;
      padding: 60px 20px 40px; /* Adjusted padding-top for fixed header on mobile */
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }
    .page-tf88vn__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: 0;
      opacity: 0.3; /* Subtle background */
    }
    .page-tf88vn__hero-content {
      position: relative;
      z-index: 1;
      max-width: 800px;
      margin: 0 auto;
    }
    .page-tf88vn__hero-section h1 {
      font-size: 2.2em;
      color: #FFD700; /* Gold accent */
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }
    .page-tf88vn__hero-section p {
      font-size: 1.1em;
      margin-bottom: 30px;
      color: #e0e0e0;
    }
    .page-tf88vn__hero-button {
      display: inline-block;
      background-color: #007bff; /* Blue for CTA */
      color: #fff;
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      cursor: pointer; /* Indicate it's clickable */
      border: none;
      font-size: 1em;
    }
    .page-tf88vn__hero-button:hover {
      background-color: #0056b3;
    }

    /* General Section Styling */
    .page-tf88vn__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: #222222; /* Slightly lighter dark for sections */
      border-radius: 8px;
    }
    .page-tf88vn__section h2 {
      font-size: 2em;
      color: #FFD700;
      text-align: center;
      margin-bottom: 30px;
      position: relative;
    }
    .page-tf88vn__section h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background-color: #007bff;
      margin: 10px auto 0;
    }

    /* Why Choose Section */
    .page-tf88vn__why-choose-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 20px;
      margin-top: 30px;
    }
    .page-tf88vn__why-choose-item {
      background-color: #2a2a2a;
      padding: 25px;
      border-radius: 8px;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }
    .page-tf88vn__why-choose-item img {
      width: 100%; /* Ensure images are responsive */
      max-width: 250px; /* Example max-width for content images */
      height: auto;
      margin-bottom: 15px;
      border-radius: 5px;
      object-fit: cover;
    }
    .page-tf88vn__why-choose-item h3 {
      font-size: 1.3em;
      color: #FFD700;
      margin-bottom: 10px;
    }
    .page-tf88vn__why-choose-item p {
      color: #e0e0e0;
      font-size: 0.95em;
    }

    /* Game Showcase */
    .page-tf88vn__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }
    .page-tf88vn__game-card {
      background-color: #2a2a2a;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
      transition: transform 0.3s ease;
      text-align: center;
    }
    .page-tf88vn__game-card:hover {
      transform: translateY(-5px);
    }
    .page-tf88vn__game-card-image-wrapper {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
    }
    .page-tf88vn__game-card-image {
      width: 100%;
      height: 200px; /* Fixed height for consistency */
      object-fit: cover;
      display: block;
    }
    .page-tf88vn__game-card-content {
      padding: 20px;
    }
    .page-tf88vn__game-card h3 {
      font-size: 1.4em;
      color: #FFD700;
      margin-bottom: 10px;
    }
    .page-tf88vn__game-card p {
      font-size: 0.9em;
      color: #c0c0c0;
    }

    /* Promotions Section */
    .page-tf88vn__promotion-item {
      background-color: #2a2a2a;
      padding: 25px;
      border-radius: 8px;
      margin-bottom: 20px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    }
    .page-tf88vn__promotion-item h3 {
      font-size: 1.5em;
      color: #007bff;
      margin-bottom: 10px;
    }
    .page-tf88vn__promotion-item p {
      color: #e0e0e0;
      margin-bottom: 15px;
    }
    .page-tf88vn__promotion-link {
      display: inline-block;
      background-color: #FFD700;
      color: #1a1a1a;
      padding: 10px 20px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      border: none;
      font-size: 0.95em;
    }
    .page-tf88vn__promotion-link:hover {
      background-color: #e0b800;
    }

    /* How To Section */
    .page-tf88vn__steps-list {
      list-style: none;
      padding: 0;
      margin-top: 30px;
    }
    .page-tf88vn__step-item {
      background-color: #2a2a2a;
      padding: 20px;
      border-radius: 8px;
      margin-bottom: 15px;
      display: flex;
      align-items: flex-start;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }
    .page-tf88vn__step-number {
      background-color: #007bff;
      color: #fff;
      border-radius: 50%;
      width: 35px;
      height: 35px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      font-size: 1.2em;
      flex-shrink: 0;
      margin-right: 15px;
    }
    .page-tf88vn__step-content h3 {
      font-size: 1.2em;
      color: #FFD700;
      margin-top: 0;
      margin-bottom: 5px;
    }
    .page-tf88vn__step-content p {
      color: #e0e0e0;
      font-size: 0.9em;
    }
    .page-tf88vn__action-button-wrapper {
        text-align: center;
        margin-top: 30px;
    }
    .page-tf88vn__action-button {
      display: inline-block;
      background-color: #007bff;
      color: #fff;
      padding: 15px 30px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease;
      cursor: pointer;
      border: none;
    }
    .page-tf88vn__action-button:hover {
      background-color: #0056b3;
    }

    /* FAQ Section */
    .page-tf88vn__faq-item {
      background-color: #2a2a2a;
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
      overflow: hidden;
    }
    .page-tf88vn__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #333333;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.3s ease;
    }
    .page-tf88vn__faq-question:hover {
      background-color: #444444;
    }
    .page-tf88vn__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      color: #FFD700;
      pointer-events: none; /* Prevent h3 from interfering with click event */
    }
    .page-tf88vn__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      color: #007bff;
      pointer-events: none; /* Prevent toggle from interfering with click event */
      transition: transform 0.3s ease;
    }
    .page-tf88vn__faq-item.active .page-tf88vn__faq-toggle {
      transform: rotate(45deg); /* Rotate '+' to 'x' or use '-' */
    }
    .page-tf88vn__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: #e0e0e0;
      font-size: 0.95em;
    }
    .page-tf88vn__faq-item.active .page-tf88vn__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to show content */
      padding: 20px !important;
      opacity: 1;
    }

    /* Floating Login Button */
    .page-tf88vn__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: #FFD700; /* Gold for prominence */
      color: #1a1a1a;
      padding: 15px 25px;
      border-radius: 50px; /* Pill shape */
      text-align: center;
      font-weight: bold;
      font-size: 1.1em;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
      z-index: 1000;
      cursor: pointer;
      transition: transform 0.3s ease, background-color 0.3s ease;
      border: none;
      animation: page-tf88vn__pulse 2s infinite;
      white-space: nowrap; /* Prevent text wrapping */
    }
    .page-tf88vn__floating-button:hover {
      background-color: #e0b800;
      transform: scale(1.05);
    }

    @keyframes page-tf88vn__pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.05); }
      100% { transform: scale(1); }
    }

    /* Responsive Design */
    @media (min-width: 768px) {
      .page-tf88vn__hero-section {
        padding-top: 80px; /* Adjusted padding-top for fixed header on desktop */
        min-height: 450px;
      }
      .page-tf88vn__hero-section h1 {
        font-size: 3em;
      }
      .page-tf88vn__hero-section p {
        font-size: 1.2em;
      }
      .page-tf88vn__why-choose-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .page-tf88vn__game-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .page-tf88vn__section h2 {
        font-size: 2.5em;
      }
    }

    @media (min-width: 1024px) {
      .page-tf88vn__why-choose-grid {
        grid-template-columns: repeat(4, 1fr);
      }
      .page-tf88vn__game-grid {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    /* Image responsive styles (mandatory) */
    .page-tf88vn img {
      max-width: 100%;
      height: auto;
      display: block; /* Remove extra space below images */
    }
    .page-tf88vn__game-card-image-wrapper,
    .page-tf88vn__why-choose-item img {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
    }

    @media (max-width: 768px) {
      .page-tf88vn img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-tf88vn__game-card-image-wrapper,
      .page-tf88vn__why-choose-item img {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
      .page-tf88vn__hero-section h1 {
        font-size: 1.8em;
      }
      .page-tf88vn__hero-section p {
        font-size: 1em;
      }
      .page-tf88vn__floating-button {
        padding: 12px 20px;
        font-size: 1em;
        bottom: 15px;
        right: 15px;
      }
      .page-tf88vn__faq-question {
        padding: 12px 15px;
      }
      .page-tf88vn__faq-question h3 {
        font-size: 1em;
      }
      .page-tf88vn__faq-answer {
        padding: 0 15px;
      }
      .page-tf88vn__faq-item.active .page-tf88vn__faq-answer {
        padding: 15px !important;
      }
    }