:root {
      --page-13-in-primary-bg: #F0F2F5;
      --page-13-in-secondary-bg: #FFFFFF;
      --page-13-in-text-color: #333333;
      --page-13-in-heading-color: #1A1A1A;
      --page-13-in-accent-color: #E44D26; /* Red-orange for buttons/highlights */
      --page-13-in-border-color: #e0e0e0;
      --page-13-in-shadow-color: rgba(0, 0, 0, 0.08);
    }

    .page-13-in {
      font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
      line-height: 1.6;
      color: var(--page-13-in-text-color);
      background-color: var(--page-13-in-primary-bg);
      padding-top: var(--header-offset, 122px); /* Fallback for header offset */
    }

    .page-13-in__section {
      padding: 40px 20px;
      margin-bottom: 20px;
      background-color: var(--page-13-in-secondary-bg);
      border-radius: 8px;
      box-shadow: 0 4px 12px var(--page-13-in-shadow-color);
    }

    .page-13-in__section--dark {
      background-color: var(--page-13-in-heading-color);
      color: var(--page-13-in-primary-bg);
      text-align: center;
    }

    .page-13-in__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
    }

    .page-13-in__heading-primary {
      font-size: 2.8em;
      color: var(--page-13-in-heading-color);
      text-align: center;
      margin-bottom: 20px;
      line-height: 1.2;
      font-weight: 700;
    }

    .page-13-in__heading-secondary {
      font-size: 2.2em;
      color: var(--page-13-in-heading-color);
      text-align: center;
      margin-bottom: 30px;
      font-weight: 600;
    }

    .page-13-in__heading-tertiary {
      font-size: 1.8em;
      color: var(--page-13-in-heading-color);
      margin-bottom: 15px;
      font-weight: 600;
    }

    .page-13-in__paragraph {
      font-size: 1.1em;
      margin-bottom: 15px;
      color: var(--page-13-in-text-color);
    }

    .page-13-in__button {
      display: inline-block;
      background-color: var(--page-13-in-accent-color);
      color: #ffffff;
      padding: 14px 28px;
      border-radius: 50px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.3s ease;
      border: none;
      cursor: pointer;
      text-align: center;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    }

    .page-13-in__button:hover {
      background-color: #C23A1B; /* Darker shade of accent */
      transform: translateY(-2px);
    }

    .page-13-in__hero-section {
      background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('[GALLERY:hero:1920x1080:casino,betting,vietnam,13win1]') no-repeat center center/cover;
      color: #ffffff;
      text-align: center;
      padding: 100px 20px;
      border-radius: 0; /* No border-radius for full width hero */
      box-shadow: none;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 500px;
      padding-top: 10px; /* Small decorative padding, as body padding should handle header */
    }

    .page-13-in__hero-title {
      font-size: 3.5em;
      margin-bottom: 20px;
      font-weight: 700;
      line-height: 1.1;
      color: #ffffff;
    }

    .page-13-in__hero-subtitle {
      font-size: 1.5em;
      margin-bottom: 30px;
      font-weight: 300;
      max-width: 800px;
      color: #ffffff;
    }

    .page-13-in__feature-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .page-13-in__feature-item {
      background-color: var(--page-13-in-secondary-bg);
      padding: 30px;
      border-radius: 8px;
      box-shadow: 0 2px 8px var(--page-13-in-shadow-color);
      text-align: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      box-sizing: border-box;
      border: 1px solid var(--page-13-in-border-color);
    }

    .page-13-in__feature-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 16px var(--page-13-in-shadow-color);
    }

    .page-13-in__feature-icon {
      width: 80px; /* Minimum 200x200px images, this is for visual presentation */
      height: 80px;
      margin-bottom: 15px;
      object-fit: contain;
      border-radius: 4px;
    }

    .page-13-in__feature-title {
      font-size: 1.4em;
      color: var(--page-13-in-heading-color);
      margin-bottom: 10px;
      font-weight: 600;
    }

    .page-13-in__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
    }

    .page-13-in__game-card {
      background-color: var(--page-13-in-secondary-bg);
      border-radius: 8px;
      box-shadow: 0 2px 8px var(--page-13-in-shadow-color);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--page-13-in-border-color);
      display: flex;
      flex-direction: column;
    }

    .page-13-in__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 6px 16px var(--page-13-in-shadow-color);
    }

    .page-13-in__game-image-wrapper {
      width: 100%;
      height: 200px;
      overflow: hidden;
      box-sizing: border-box;
    }

    .page-13-in__game-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .page-13-in__game-content {
      padding: 20px;
      flex-grow: 1;
    }

    .page-13-in__game-title {
      font-size: 1.3em;
      color: var(--page-13-in-heading-color);
      margin-bottom: 10px;
      font-weight: 600;
    }

    .page-13-in__game-description {
      font-size: 0.95em;
      color: var(--page-13-in-text-color);
    }

    .page-13-in__steps-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .page-13-in__step-item {
      display: flex;
      align-items: flex-start;
      margin-bottom: 30px;
      box-sizing: border-box;
    }

    .page-13-in__step-number {
      background-color: var(--page-13-in-accent-color);
      color: #ffffff;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 1.4em;
      font-weight: bold;
      flex-shrink: 0;
      margin-right: 20px;
    }

    .page-13-in__step-content {
      flex-grow: 1;
    }

    .page-13-in__step-title {
      font-size: 1.5em;
      color: var(--page-13-in-heading-color);
      margin-bottom: 10px;
      font-weight: 600;
    }

    .page-13-in__faq-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .page-13-in__faq-item {
      background-color: var(--page-13-in-secondary-bg);
      border: 1px solid var(--page-13-in-border-color);
      border-radius: 8px;
      margin-bottom: 10px;
      overflow: hidden;
      box-shadow: 0 2px 5px var(--page-13-in-shadow-color);
    }

    .page-13-in__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #fcfcfc;
      border-bottom: 1px solid transparent;
      transition: background-color 0.3s ease, border-bottom 0.3s ease;
      user-select: none;
    }

    .page-13-in__faq-question:hover {
      background-color: #f5f5f5;
    }

    .page-13-in__faq-item.active .page-13-in__faq-question {
      border-bottom: 1px solid var(--page-13-in-border-color);
    }

    .page-13-in__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: var(--page-13-in-heading-color);
      flex-grow: 1;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-13-in__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-13-in-accent-color);
      width: 30px;
      text-align: center;
      flex-shrink: 0;
      pointer-events: none; /* Prevent toggle icon from blocking click event */
    }

    .page-13-in__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px; /* Initial padding */
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      font-size: 0.95em;
      color: var(--page-13-in-text-color);
    }

    .page-13-in__faq-item.active .page-13-in__faq-answer {
      max-height: 2000px !important; /* Sufficiently large value */
      padding: 20px !important; /* Expanded padding */
      opacity: 1;
    }

    .page-13-in__contact-info {
      text-align: center;
      font-size: 1.1em;
    }

    .page-13-in__contact-info strong {
      color: var(--page-13-in-accent-color);
    }

    .page-13-in__image-container {
      width: 100%;
      max-width: 100%;
      overflow: hidden;
      box-sizing: border-box;
      margin-bottom: 20px;
    }

    .page-13-in img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 8px;
      box-shadow: 0 2px 8px var(--page-13-in-shadow-color);
    }
    
    /* Responsive adjustments */
    @media (max-width: 992px) {
      .page-13-in__hero-title {
        font-size: 3em;
      }
      .page-13-in__hero-subtitle {
        font-size: 1.3em;
      }
      .page-13-in__heading-primary {
        font-size: 2.4em;
      }
      .page-13-in__heading-secondary {
        font-size: 1.8em;
      }
      .page-13-in__heading-tertiary {
        font-size: 1.5em;
      }
    }

    @media (max-width: 768px) {
      .page-13-in {
        padding-top: var(--header-offset, 100px); /* Adjust for smaller header on mobile */
      }
      .page-13-in__hero-section {
        padding: 80px 15px;
        min-height: 400px;
      }
      .page-13-in__hero-title {
        font-size: 2.5em;
      }
      .page-13-in__hero-subtitle {
        font-size: 1.1em;
      }
      .page-13-in__section {
        padding: 30px 15px;
      }
      .page-13-in__heading-primary {
        font-size: 2em;
      }
      .page-13-in__heading-secondary {
        font-size: 1.6em;
      }
      .page-13-in__heading-tertiary {
        font-size: 1.3em;
      }
      .page-13-in__paragraph {
        font-size: 1em;
      }
      .page-13-in__button {
        padding: 12px 24px;
        font-size: 1em;
      }

      /* List items responsive */
      .page-13-in__feature-list,
      .page-13-in__game-grid,
      .page-13-in__steps-list {
        width: 100% !important;
        max-width: 100% !important;
        padding: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
        display: flex; /* Make sure they stack */
        flex-direction: column;
        gap: 15px; /* Adjust gap for mobile */
      }

      .page-13-in__feature-item,
      .page-13-in__game-card,
      .page-13-in__step-item {
        width: 100% !important;
        max-width: 100% !important;
        padding: 20px !important; /* Adjust padding as needed */
        margin-left: 0 !important;
        margin-right: 0 !important;
        box-sizing: border-box !important;
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      .page-13-in__step-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
      }
      .page-13-in__step-number {
        margin-right: 0;
        margin-bottom: 15px;
      }

      /* Image responsive */
      .page-13-in img {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
      }
      .page-13-in__image-container {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
      }

      /* FAQ responsive */
      .page-13-in__faq-question {
        padding: 12px 15px;
      }
      .page-13-in__faq-question h3 {
        font-size: 1.1em;
      }
      .page-13-in__faq-toggle {
        font-size: 1.5em;
      }
      .page-13-in__faq-answer {
        padding: 0 15px;
      }
      .page-13-in__faq-item.active .page-13-in__faq-answer {
        padding: 15px !important;
      }
    }

    @media (max-width: 480px) {
      .page-13-in__hero-title {
        font-size: 2em;
      }
      .page-13-in__hero-subtitle {
        font-size: 1em;
      }
      .page-13-in__heading-primary {
        font-size: 1.8em;
      }
      .page-13-in__heading-secondary {
        font-size: 1.4em;
      }
      .page-13-in__heading-tertiary {
        font-size: 1.2em;
      }
    }