:root {
      --page-twin-primary-color: #e44d26; /* Cam đỏ */
      --page-twin-secondary-color: #333;
      --page-twin-accent-color: #f7b731; /* Vàng cam */
      --page-twin-background-dark: #1a1a1a;
      --page-twin-background-light: #f4f4f4;
      --page-twin-text-light: #f4f4f4;
      --page-twin-text-dark: #333;
    }

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

    .page-twin__section {
      padding: 40px 20px;
      text-align: center;
      margin-bottom: 20px;
    }

    .page-twin__section--dark {
      background-color: var(--page-twin-background-dark);
      color: var(--page-twin-text-light);
    }

    .page-twin__section-title {
      font-size: 2.5em;
      color: var(--page-twin-primary-color);
      margin-bottom: 25px;
      position: relative;
      padding-bottom: 10px;
    }

    .page-twin__section-title--light {
      color: var(--page-twin-accent-color);
    }

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

    .page-twin__text-content {
      max-width: 800px;
      margin: 0 auto 30px auto;
      font-size: 1.1em;
      color: var(--page-twin-text-dark);
    }

    .page-twin__text-content--light {
      color: var(--page-twin-text-light);
    }

    /* Hero Section */
    .page-twin__hero-section {
      position: relative;
      width: 100%;
      overflow: hidden;
      padding-top: 10px; /* For fixed header */
      margin-bottom: 20px;
      background-color: var(--page-twin-background-dark); /* Fallback if image fails */
    }

    .page-twin__hero-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      max-width: 100%;
      border-radius: 8px; /* Slightly rounded corners for aesthetic */
    }

    .page-twin__hero-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      color: var(--page-twin-text-light);
      text-align: center;
      width: 90%;
      max-width: 800px;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.5);
      border-radius: 10px;
      box-sizing: border-box;
    }

    .page-twin__hero-title {
      font-size: 3em;
      margin-bottom: 10px;
      color: var(--page-twin-accent-color);
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-twin__hero-subtitle {
      font-size: 1.5em;
      margin-bottom: 20px;
      color: var(--page-twin-text-light);
      text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
    }

    /* Floating Login Button */
    .page-twin__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-image: linear-gradient(45deg, var(--page-twin-primary-color), var(--page-twin-accent-color));
      color: white;
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.2em;
      font-weight: bold;
      text-align: center;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      z-index: 1000;
      cursor: pointer;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      animation: pulse 2s infinite;
      border: none; /* Use button tag for accessibility, remove default border */
    }

    .page-twin__floating-button:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
    }

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

    /* Game Products Section */
    .page-twin__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .page-twin__game-card {
      background-color: white;
      border-radius: 12px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      padding-bottom: 20px;
    }

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

    .page-twin__game-image-wrapper {
        width: 100%;
        height: 200px; /* Fixed height for consistent card size */
        overflow: hidden;
        margin-bottom: 15px;
    }

    .page-twin__game-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .page-twin__game-card:hover .page-twin__game-image {
        transform: scale(1.05);
    }

    .page-twin__game-title {
      font-size: 1.6em;
      color: var(--page-twin-secondary-color);
      margin-bottom: 10px;
      padding: 0 15px;
    }

    .page-twin__game-description {
      font-size: 0.95em;
      color: #666;
      padding: 0 15px;
      margin-bottom: 15px;
    }

    /* Download Section */
    .page-twin__download-options {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 40px;
    }

    .page-twin__download-card {
      background-color: white;
      padding: 30px;
      border-radius: 15px;
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
      text-align: center;
      width: 280px;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-twin__download-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    }

    .page-twin__download-icon-wrapper {
        width: 120px;
        height: 120px;
        margin: 0 auto 20px auto;
        border-radius: 20%;
        overflow: hidden;
    }

    .page-twin__download-icon {
      width: 100%; /* Larger icons for content, not small */
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .page-twin__download-title {
      font-size: 1.8em;
      color: var(--page-twin-primary-color);
      margin-bottom: 15px;
    }

    .page-twin__download-button {
      background-image: linear-gradient(90deg, var(--page-twin-accent-color), var(--page-twin-primary-color));
      color: white;
      padding: 12px 25px;
      border-radius: 30px;
      font-size: 1.1em;
      font-weight: bold;
      cursor: pointer;
      transition: opacity 0.3s ease;
      border: none;
    }

    .page-twin__download-button:hover {
      opacity: 0.9;
    }

    /* Promotions Section */
    .page-twin__promo-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .page-twin__promo-card {
      background-color: var(--page-twin-background-dark);
      color: var(--page-twin-text-light);
      border-radius: 12px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
      padding: 25px;
      text-align: left;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border-left: 5px solid var(--page-twin-accent-color);
    }

    .page-twin__promo-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    }

    .page-twin__promo-title {
      font-size: 1.8em;
      color: var(--page-twin-accent-color);
      margin-bottom: 10px;
    }

    .page-twin__promo-description {
      font-size: 1em;
      line-height: 1.5;
      margin-bottom: 15px;
    }

    .page-twin__promo-button {
      background-color: var(--page-twin-primary-color);
      color: white;
      padding: 10px 20px;
      border-radius: 25px;
      font-size: 1em;
      font-weight: bold;
      cursor: pointer;
      transition: background-color 0.3s ease;
      border: none;
    }

    .page-twin__promo-button:hover {
      background-color: #c23b1a;
    }

    /* Tips & Strategies Section */
    .page-twin__tips-list {
      list-style: none;
      padding: 0;
      max-width: 900px;
      margin: 0 auto;
    }

    .page-twin__tip-item {
      background-color: white;
      border-left: 5px solid var(--page-twin-primary-color);
      margin-bottom: 15px;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      text-align: left;
    }

    .page-twin__tip-title {
      font-size: 1.5em;
      color: var(--page-twin-primary-color);
      margin-bottom: 10px;
    }

    .page-twin__tip-description {
      font-size: 1em;
      color: var(--page-twin-secondary-color);
    }

    /* FAQ Section */
    .page-twin__faq-container {
      max-width: 900px;
      margin: 0 auto;
      text-align: left;
    }

    .page-twin__faq-item {
      background-color: white;
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      overflow: hidden;
    }

    .page-twin__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: var(--page-twin-primary-color);
      color: white;
      cursor: pointer;
      user-select: none;
      font-size: 1.2em;
      font-weight: bold;
      transition: background-color 0.3s ease;
    }

    .page-twin__faq-question:hover {
      background-color: #c23b1a;
    }

    .page-twin__faq-question h3 {
      margin: 0;
      font-size: 1.2em;
      color: white;
      pointer-events: none; /* Prevent h3 from blocking click */
    }

    .page-twin__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      transition: transform 0.3s ease;
      pointer-events: none; /* Prevent toggle from blocking click */
    }

    .page-twin__faq-item.active .page-twin__faq-toggle {
      transform: rotate(45deg);
    }

    .page-twin__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px; /* Initial padding */
      background-color: var(--page-twin-background-light);
      color: var(--page-twin-text-dark);
      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: 1em;
    }

    .page-twin__faq-item.active .page-twin__faq-answer {
      max-height: 2000px !important; /* Sufficiently large for content */
      padding: 20px !important; /* Final padding */
      opacity: 1;
    }

    /* Payment and Provider section */
    .page-twin__payment-providers-grid {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 20px;
        margin-top: 30px;
        max-width: 1000px;
        margin-left: auto;
        margin-right: auto;
    }

    .page-twin__provider-item {
        background-color: #fff;
        border-radius: 10px;
        padding: 15px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        text-align: center;
        min-width: 100px;
        flex: 1 1 auto;
        max-width: 150px;
        transition: transform 0.2s ease;
    }

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

    .page-twin__provider-logo {
        width: 80px;
        height: 80px;
        object-fit: contain;
        margin-bottom: 10px;
        display: block;
        margin-left: auto;
        margin-right: auto;
    }

    .page-twin__provider-item p {
        font-weight: bold;
        color: var(--page-twin-secondary-color);
        margin: 0;
    }

    .page-twin__provider-text-list {
        margin-top: 30px;
        font-size: 1.1em;
        color: var(--page-twin-text-dark);
    }
    .page-twin__provider-text-list .page-twin__text-content {
        color: var(--page-twin-text-dark); /* Ensure text color is visible */
    }


    /* Responsive Design */
    @media (max-width: 768px) {
      .page-twin__section {
        padding: 30px 15px;
      }

      .page-twin__section-title {
        font-size: 2em;
        margin-bottom: 20px;
      }

      .page-twin__hero-section {
        padding-top: 10px; /* Mobile fixed header spacing */
      }

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

      .page-twin__hero-subtitle {
        font-size: 1.2em;
      }

      .page-twin__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }

      .page-twin__game-grid,
      .page-twin__download-options,
      .page-twin__promo-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .page-twin__game-card,
      .page-twin__download-card,
      .page-twin__promo-card {
        width: auto;
        margin: 0 auto;
      }

      .page-twin__faq-question {
        font-size: 1.1em;
        padding: 12px 15px;
      }

      .page-twin__faq-question h3 {
        font-size: 1.1em;
      }

      .page-twin__faq-answer {
        font-size: 0.95em;
        padding: 0 15px; /* Mobile initial padding */
      }

      .page-twin__faq-item.active .page-twin__faq-answer {
        padding: 15px !important; /* Mobile final padding */
      }

      .page-twin__payment-providers-grid {
          grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
          gap: 10px;
      }

      .page-twin__provider-item {
          max-width: 100px;
          padding: 10px;
      }

      .page-twin__provider-logo {
          width: 60px;
          height: 60px;
      }

      .page-twin__provider-item p {
          font-size: 0.8em;
      }

      /* Image responsive optimization for all images */
      .page-twin img {
        max-width: 100% !important;
        height: auto !important;
        display: block !important;
      }
      .page-twin__game-image-wrapper, .page-twin__download-icon-wrapper, .page-twin__provider-item {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }