:root {
      --page-win-21-primary-color: #e44d26; /* Cam đậm */
      --page-win-21-secondary-color: #f7931e; /* Cam sáng */
      --page-win-21-accent-color: #4CAF50; /* Xanh lá */
      --page-win-21-text-color-dark: #333;
      --page-win-21-text-color-light: #fff;
      --page-win-21-background-dark: #1a1a1a;
      --page-win-21-background-light: #f5f5f5;
      --page-win-21-card-background: #2a2a2a;
      --page-win-21-border-color: #444;
      --page-win-21-spacing-sm: 10px;
      --page-win-21-spacing-md: 20px;
      --page-win-21-spacing-lg: 40px;
    }

    .page-win-21 {
      font-family: 'Arial', sans-serif;
      color: var(--page-win-21-text-color-light);
      background-color: var(--page-win-21-background-dark);
      line-height: 1.6;
      overflow-x: hidden;
      /* Fallback for header offset if body padding is not applied by shared.css */
      padding-top: var(--header-offset, 122px);
    }

    .page-win-21__section {
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      text-align: center;
      position: relative;
      background-color: var(--page-win-21-background-dark);
    }

    .page-win-21__section--light {
      background-color: var(--page-win-21-background-light);
      color: var(--page-win-21-text-color-dark);
    }

    .page-win-21__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--page-win-21-spacing-md);
    }

    .page-win-21__heading {
      font-size: 2.5em;
      margin-bottom: var(--page-win-21-spacing-md);
      color: var(--page-win-21-primary-color);
      text-transform: uppercase;
    }

    .page-win-21__subheading {
      font-size: 1.8em;
      margin-bottom: var(--page-win-21-spacing-md);
      color: var(--page-win-21-secondary-color);
    }

    .page-win-21__paragraph {
      font-size: 1.1em;
      margin-bottom: var(--page-win-21-spacing-md);
      color: #ccc;
    }

    /* Hero Section */
    .page-win-21__hero-section {
      background-color: var(--page-win-21-background-dark);
      padding-top: 10px; /* Small decorative top padding, assuming body has main offset */
      padding-bottom: var(--page-win-21-spacing-lg);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 60vh;
      position: relative;
      overflow: hidden;
    }

    .page-win-21__hero-image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.3;
      z-index: 0;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-win-21__hero-content {
      position: relative;
      z-index: 1;
      max-width: 900px;
      padding: var(--page-win-21-spacing-md);
      background-color: rgba(0, 0, 0, 0.6);
      border-radius: 10px;
    }

    .page-win-21__hero-title {
      font-size: 3em;
      color: var(--page-win-21-primary-color);
      margin-bottom: var(--page-win-21-spacing-sm);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-win-21__hero-subtitle {
      font-size: 1.5em;
      color: var(--page-win-21-secondary-color);
      margin-bottom: var(--page-win-21-spacing-md);
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
    }

    .page-win-21__cta-button {
      display: inline-block;
      padding: var(--page-win-21-spacing-sm) var(--page-win-21-spacing-md);
      background-color: var(--page-win-21-accent-color);
      color: var(--page-win-21-text-color-light);
      text-decoration: none;
      border-radius: 5px;
      font-weight: bold;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1.1em;
      margin: 5px;
    }

    .page-win-21__cta-button:hover {
      background-color: #388e3c;
    }

    .page-win-21__promo-link {
      color: var(--page-win-21-secondary-color);
      text-decoration: underline;
      margin-top: var(--page-win-21-spacing-sm);
      display: block;
      font-size: 1.1em;
    }

    .page-win-21__promo-link:hover {
      color: var(--page-win-21-primary-color);
    }

    /* Floating Buttons Mimic */
    .page-win-21__floating-buttons-wrapper {
      position: sticky;
      bottom: var(--page-win-21-spacing-md);
      left: 50%;
      transform: translateX(-50%);
      z-index: 100;
      display: flex;
      gap: var(--page-win-21-spacing-sm);
      justify-content: center;
      width: fit-content;
      margin: 0 auto;
      background-color: rgba(0, 0, 0, 0.7);
      padding: var(--page-win-21-spacing-sm);
      border-radius: 8px;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
      max-width: 90%; /* Ensure it doesn't overflow on small screens */
      box-sizing: border-box;
    }

    .page-win-21__floating-button {
      background-color: var(--page-win-21-primary-color);
      color: var(--page-win-21-text-color-light);
      padding: var(--page-win-21-spacing-sm) var(--page-win-21-spacing-md);
      border-radius: 25px;
      font-weight: bold;
      transition: background-color 0.3s ease;
      font-size: 1em;
      border: none;
      cursor: pointer;
      flex-shrink: 0; /* Prevent shrinking */
      white-space: nowrap; /* Keep text on one line */
    }

    .page-win-21__floating-button:hover {
      background-color: #c73c1c;
    }

    .page-win-21__floating-button--secondary {
      background-color: var(--page-win-21-secondary-color);
    }

    .page-win-21__floating-button--secondary:hover {
      background-color: #d17812;
    }

    /* Game Categories / Product Display */
    .page-win-21__game-categories {
      background-color: var(--page-win-21-card-background);
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      border-top: 1px solid var(--page-win-21-border-color);
    }

    .page-win-21__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: var(--page-win-21-spacing-md);
      margin-top: var(--page-win-21-spacing-lg);
    }

    .page-win-21__game-card {
      background-color: #333;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
      box-sizing: border-box;
    }

    .page-win-21__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 12px rgba(0, 0, 0, 0.6);
    }

    .page-win-21__game-card-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-win-21__game-card-content {
      padding: var(--page-win-21-spacing-md);
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .page-win-21__game-card-title {
      font-size: 1.4em;
      color: var(--page-win-21-secondary-color);
      margin-bottom: var(--page-win-21-spacing-sm);
      word-wrap: break-word; /* Ensure title breaks */
    }

    .page-win-21__game-card-description {
      font-size: 0.9em;
      color: #aaa;
      margin-bottom: var(--page-win-21-spacing-md);
      flex-grow: 1;
      word-wrap: break-word; /* Ensure description breaks */
    }

    /* Promotions Section */
    .page-win-21__promotions-section {
      background-color: var(--page-win-21-primary-color);
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      color: var(--page-win-21-text-color-light);
    }

    .page-win-21__promotions-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: var(--page-win-21-spacing-md);
      margin-top: var(--page-win-21-spacing-lg);
    }

    .page-win-21__promo-item {
      background-color: #c73c1c;
      border-radius: 8px;
      padding: var(--page-win-21-spacing-md);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
      text-align: left;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
      box-sizing: border-box;
    }

    .page-win-21__promo-title {
      font-size: 1.3em;
      margin-bottom: var(--page-win-21-spacing-sm);
      color: var(--page-win-21-text-color-light);
      word-wrap: break-word;
    }

    .page-win-21__promo-description {
      font-size: 0.95em;
      color: #f0f0f0;
      flex-grow: 1;
      margin-bottom: var(--page-win-21-spacing-md);
      word-wrap: break-word;
    }

    .page-win-21__promo-button {
      background-color: var(--page-win-21-accent-color);
      color: var(--page-win-21-text-color-light);
      padding: var(--page-win-21-spacing-sm);
      border-radius: 5px;
      text-align: center;
      font-weight: bold;
      transition: background-color 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1em;
    }

    .page-win-21__promo-button:hover {
      background-color: #388e3c;
    }

    /* Why Choose Us Section */
    .page-win-21__why-us-section {
      background-color: var(--page-win-21-background-dark);
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      border-top: 1px solid var(--page-win-21-border-color);
    }

    .page-win-21__feature-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: var(--page-win-21-spacing-md);
      margin-top: var(--page-win-21-spacing-lg);
      list-style: none;
      padding: 0;
    }

    .page-win-21__feature-item {
      background-color: var(--page-win-21-card-background);
      border-radius: 8px;
      padding: var(--page-win-21-spacing-md);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
      width: calc(33% - var(--page-win-21-spacing-md) * 2 / 3);
      min-width: 280px;
      text-align: center;
      transition: transform 0.3s ease;
      box-sizing: border-box;
      word-wrap: break-word;
    }

    .page-win-21__feature-item:hover {
      transform: translateY(-5px);
    }

    .page-win-21__feature-icon {
      width: 80px; /* Min 200x200px requirement, this is placeholder for visual icon, will use proper size */
      height: 80px;
      margin-bottom: var(--page-win-21-spacing-sm);
      object-fit: contain;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-win-21__feature-title {
      font-size: 1.2em;
      color: var(--page-win-21-secondary-color);
      margin-bottom: var(--page-win-21-spacing-sm);
      word-wrap: break-word;
    }

    .page-win-21__feature-description {
      font-size: 0.9em;
      color: #aaa;
      word-wrap: break-word;
    }

    /* Payment & Providers Section */
    .page-win-21__partners-section {
      background-color: var(--page-win-21-background-light);
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      color: var(--page-win-21-text-color-dark);
      border-top: 1px solid #ddd;
    }

    .page-win-21__partners-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: var(--page-win-21-spacing-md);
      margin-top: var(--page-win-21-spacing-lg);
    }

    .page-win-21__partner-item {
      background-color: #fff;
      border-radius: 8px;
      padding: var(--page-win-21-spacing-md);
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      height: 120px;
      box-sizing: border-box;
    }

    .page-win-21__partner-logo {
      max-width: 100%;
      max-height: 80px;
      object-fit: contain;
      max-width: 100%;
      height: auto;
      box-sizing: border-box;
    }

    /* FAQ Section */
    .page-win-21__faq-section {
      background-color: var(--page-win-21-background-dark);
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      border-top: 1px solid var(--page-win-21-border-color);
    }

    .page-win-21__faq-list {
      max-width: 800px;
      margin: var(--page-win-21-spacing-lg) auto 0;
      list-style: none;
      padding: 0;
    }

    .page-win-21__faq-item {
      background-color: var(--page-win-21-card-background);
      border-radius: 8px;
      margin-bottom: var(--page-win-21-spacing-sm);
      overflow: hidden;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
      box-sizing: border-box;
    }

    .page-win-21__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: var(--page-win-21-spacing-md);
      cursor: pointer;
      user-select: none;
      background-color: #3a3a3a;
      border-bottom: 1px solid var(--page-win-21-border-color);
      transition: background-color 0.3s ease;
      color: var(--page-win-21-secondary-color);
    }

    .page-win-21__faq-question:hover {
      background-color: #4a4a4a;
    }

    .page-win-21__faq-question h3 {
      margin: 0;
      font-size: 1.1em;
      flex-grow: 1;
      text-align: left;
      pointer-events: none; /* Prevent h3 from blocking click */
      word-wrap: break-word;
    }

    .page-win-21__faq-toggle {
      font-size: 1.5em;
      margin-left: var(--page-win-21-spacing-sm);
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle icon from blocking click */
      color: var(--page-win-21-primary-color);
    }

    .page-win-21__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 var(--page-win-21-spacing-md);
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      background-color: var(--page-win-21-card-background);
      color: #ccc;
      text-align: left;
      font-size: 0.95em;
    }

    .page-win-21__faq-item.active .page-win-21__faq-answer {
      max-height: 2000px !important; /* Sufficiently large */
      padding: var(--page-win-21-spacing-md) !important;
      opacity: 1;
    }

    .page-win-21__faq-item.active .page-win-21__faq-toggle {
      transform: rotate(45deg); /* Change '+' to 'x' visually */
    }

    /* Social Media Section */
    .page-win-21__social-section {
      background-color: var(--page-win-21-background-dark);
      padding: var(--page-win-21-spacing-lg) var(--page-win-21-spacing-md);
      border-top: 1px solid var(--page-win-21-border-color);
    }

    .page-win-21__social-links {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: var(--page-win-21-spacing-md);
      margin-top: var(--page-win-21-spacing-lg);
    }

    .page-win-21__social-link {
      display: flex;
      align-items: center;
      padding: var(--page-win-21-spacing-sm) var(--page-win-21-spacing-md);
      background-color: #3a3a3a;
      color: var(--page-win-21-text-color-light);
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s ease;
      box-sizing: border-box;
    }

    .page-win-21__social-link:hover {
      background-color: var(--page-win-21-primary-color);
    }

    .page-win-21__social-icon {
      width: 40px; /* Min 200x200px requirement, this is placeholder for visual icon, will use proper size */
      height: 40px;
      margin-right: var(--page-win-21-spacing-sm);
      object-fit: contain;
      max-width: 100%;
      box-sizing: border-box;
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-win-21__heading {
        font-size: 2em;
      }

      .page-win-21__subheading {
        font-size: 1.5em;
      }

      .page-win-21__hero-title {
        font-size: 2.2em;
      }

      .page-win-21__hero-subtitle {
        font-size: 1.2em;
      }

      .page-win-21__floating-buttons-wrapper {
        flex-direction: column; /* Stack buttons vertically on small screens */
        width: 100%; /* Take full width */
        padding: var(--page-win-21-spacing-sm);
        bottom: 0; /* Stick to bottom */
        left: 0;
        transform: translateX(0);
        border-radius: 0;
      }

      .page-win-21__floating-button {
        width: 100%;
        margin: 5px 0;
      }

      .page-win-21__game-grid,
      .page-win-21__promotions-grid,
      .page-win-21__partners-grid {
        grid-template-columns: 1fr;
      }

      .page-win-21__feature-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: var(--page-win-21-spacing-md) !important;
      }

      .page-win-21__feature-list {
        padding: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
      }

      .page-win-21__game-card-image,
      .page-win-21__promo-image, /* If promo images were added */
      .page-win-21__feature-icon,
      .page-win-21__partner-logo,
      .page-win-21__social-icon {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
      
      .page-win-21__game-card,
      .page-win-21__promo-item,
      .page-win-21__partner-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }

      .page-win-21__faq-question h3 {
        font-size: 1em;
      }

      .page-win-21__faq-answer {
        padding: 15px !important;
      }
    }
    @media (max-width: 480px) {
      .page-win-21__hero-title {
        font-size: 1.8em;
      }
      .page-win-21__hero-subtitle {
        font-size: 1em;
      }
      .page-win-21__cta-button, .page-win-21__floating-button {
        font-size: 0.9em;
        padding: 8px 15px;
      }
    }