:root {
      --primary-color: #e44d26; /* Màu chủ đạo */
      --secondary-color: #333;
      --accent-color: #f7b32b; /* Màu nhấn */
      --text-color: #ffffff;
      --bg-color: #1a1a1a;
      --card-bg: #2a2a2a;
      --border-color: #444;
      --shadow-color: rgba(0, 0, 0, 0.5);
    }

    .page-13win21 {
      font-family: 'Arial', sans-serif;
      color: var(--text-color);
      background-color: var(--bg-color);
      line-height: 1.6;
      overflow-x: hidden;
      padding-top: var(--header-offset, 122px); /* Khoảng cách cho header */
    }

    .page-13win21__container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 15px;
      box-sizing: border-box;
    }

    .page-13win21__section {
      padding: 40px 0;
      text-align: center;
    }

    .page-13win21__section--dark {
      background-color: #222;
    }

    .page-13win21__heading {
      font-size: 2.5em;
      margin-bottom: 20px;
      color: var(--accent-color);
      text-transform: uppercase;
      font-weight: bold;
    }

    .page-13win21__subheading {
      font-size: 1.8em;
      margin-bottom: 15px;
      color: var(--primary-color);
    }

    .page-13win21__text {
      font-size: 1.1em;
      margin-bottom: 20px;
    }

    /* Hero Section */
    .page-13win21__hero-section {
      position: relative;
      height: 70vh; /* Điều chỉnh cho di động */
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      overflow: hidden;
      padding-top: 10px; /* Padding trang trí nhỏ */
    }

    .page-13win21__hero-background {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      z-index: -1;
      filter: brightness(0.5);
    }

    .page-13win21__hero-content {
      position: relative;
      z-index: 1;
      padding: 20px;
      background-color: rgba(0, 0, 0, 0.6);
      border-radius: 10px;
      max-width: 90%;
    }

    .page-13win21__hero-title {
      font-size: 2.8em;
      color: var(--accent-color);
      margin-bottom: 10px;
      text-shadow: 2px 2px 4px var(--shadow-color);
    }

    .page-13win21__hero-description {
      font-size: 1.2em;
      color: var(--text-color);
      margin-bottom: 30px;
      max-width: 800px;
    }

    .page-13win21__cta-button {
      display: inline-block;
      background-color: var(--primary-color);
      color: var(--text-color);
      padding: 12px 25px;
      border-radius: 5px;
      text-decoration: none;
      font-weight: bold;
      font-size: 1.1em;
      transition: background-color 0.3s ease, transform 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .page-13win21__cta-button:hover {
      background-color: #ff6a40;
      transform: translateY(-2px);
    }

    /* Floating Buttons */
    .page-13win21__floating-buttons {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 1000;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .page-13win21__floating-button {
      background-color: var(--accent-color);
      color: var(--secondary-color);
      padding: 12px 20px;
      border-radius: 50px;
      font-weight: bold;
      box-shadow: 0 4px 8px var(--shadow-color);
      border: none;
      cursor: pointer;
      transition: background-color 0.3s ease, transform 0.2s ease;
    }

    .page-13win21__floating-button--register {
      background-color: var(--primary-color);
      color: var(--text-color);
    }

    .page-13win21__floating-button:hover {
      transform: translateY(-3px);
      box-shadow: 0 6px 12px rgba(0, 0, 0, 0.6);
    }

    /* Promotions Section */
    .page-13win21__promotions-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-13win21__promotion-card {
      background-color: var(--card-bg);
      border-radius: 10px;
      padding: 25px;
      text-align: left;
      box-shadow: 0 4px 8px var(--shadow-color);
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      box-sizing: border-box;
    }

    .page-13win21__promotion-card:hover {
      transform: translateY(-5px);
    }

    .page-13win21__promotion-image {
      width: 100%;
      height: 200px; /* Chiều cao cố định */
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 15px;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-13win21__promotion-title {
      font-size: 1.5em;
      color: var(--accent-color);
      margin-bottom: 10px;
    }

    .page-13win21__promotion-description {
      font-size: 1em;
      color: #ccc;
      flex-grow: 1; /* Đẩy nút xuống dưới */
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    /* Product Display */
    .page-13win21__product-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
      margin-top: 30px;
      justify-content: center; /* Căn giữa các mục nếu không đủ hàng */
    }

    .page-13win21__product-item {
      background-color: var(--card-bg);
      border-radius: 10px;
      padding: 20px;
      box-shadow: 0 4px 8px var(--shadow-color);
      transition: transform 0.3s ease;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .page-13win21__product-item:hover {
      transform: translateY(-5px);
    }

    .page-13win21__product-image {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 15px;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-13win21__product-title {
      font-size: 1.3em;
      color: var(--primary-color);
      margin-bottom: 10px;
    }

    .page-13win21__product-description {
      font-size: 0.95em;
      color: #ccc;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    /* Why Choose Us / Features */
    .page-13win21__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-13win21__feature-card {
      background-color: var(--card-bg);
      border-radius: 10px;
      padding: 25px;
      text-align: left;
      box-shadow: 0 4px 8px var(--shadow-color);
      box-sizing: border-box;
    }

    .page-13win21__feature-icon {
      width: 200px; /* Tối thiểu 200x200px */
      height: 200px;
      margin-bottom: 15px;
      max-width: 100%;
      box-sizing: border-box;
    }

    .page-13win21__feature-title {
      font-size: 1.4em;
      color: var(--accent-color);
      margin-bottom: 10px;
    }

    .page-13win21__feature-description {
      font-size: 1em;
      color: #ccc;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    /* Payment & Providers */
    .page-13win21__logos-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
      margin-top: 30px;
      justify-content: center;
      align-items: center;
    }

    .page-13win21__logo-item {
      background-color: var(--card-bg);
      border-radius: 8px;
      padding: 15px;
      box-shadow: 0 2px 4px var(--shadow-color);
      transition: transform 0.2s ease;
      box-sizing: border-box;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100px; /* Đảm bảo chiều cao nhất quán cho thẻ logo */
    }

    .page-13win21__logo-item:hover {
      transform: translateY(-3px);
    }

    .page-13win21__logo-image {
      max-width: 100%;
      max-height: 80px; /* Điều chỉnh dựa trên kích thước logo thực tế */
      object-fit: contain;
      box-sizing: border-box;
      min-width: 200px; /* Đảm bảo kích thước tối thiểu 200px */
      min-height: 200px;
    }

    /* FAQ Section */
    .page-13win21__faq-list {
      margin-top: 30px;
      text-align: left;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .page-13win21__faq-item {
      background-color: var(--card-bg);
      border-radius: 8px;
      margin-bottom: 15px;
      box-shadow: 0 2px 4px var(--shadow-color);
      overflow: hidden;
    }

    .page-13win21__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      background-color: #3a3a3a;
      cursor: pointer;
      user-select: none;
      font-size: 1.1em;
      color: var(--accent-color);
      transition: background-color 0.3s ease;
    }

    .page-13win21__faq-question h3 {
      margin: 0;
      color: inherit;
      pointer-events: none; /* Ngăn h3 chặn sự kiện click */
      flex-grow: 1;
      word-wrap: break-word;
      overflow-wrap: break-word;
    }

    .page-13win21__faq-toggle {
      font-size: 1.5em;
      font-weight: bold;
      margin-left: 15px;
      pointer-events: none; /* Ngăn nút chuyển đổi chặn sự kiện click */
      transition: transform 0.3s ease;
    }

    .page-13win21__faq-item.active .page-13win21__faq-toggle {
      transform: rotate(45deg); /* Thay đổi + thành X hoặc tương tự */
    }

    .page-13win21__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      color: #ccc;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      opacity: 0;
      box-sizing: border-box;
    }

    .page-13win21__faq-item.active .page-13win21__faq-answer {
      max-height: 2000px !important; /* Đủ lớn để chứa nội dung */
      padding: 20px !important;
      opacity: 1;
    }

    /* Call to Action Section */
    .page-13win21__cta-section {
      background-color: var(--primary-color);
      padding: 50px 0;
      text-align: center;
    }

    .page-13win21__cta-section .page-13win21__heading {
      color: var(--text-color);
    }

    .page-13win21__cta-section .page-13win21__text {
      color: var(--text-color);
      max-width: 800px;
      margin: 0 auto 30px auto;
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-13win21__hero-section {
        height: 60vh;
      }

      .page-13win21__hero-title {
        font-size: 2em;
      }

      .page-13win21__hero-description {
        font-size: 1em;
      }

      .page-13win21__heading {
        font-size: 2em;
      }

      .page-13win21__subheading {
        font-size: 1.5em;
      }

      .page-13win21__text {
        font-size: 1em;
      }

      .page-13win21__floating-buttons {
        bottom: 15px;
        right: 15px;
        flex-direction: row; /* Nằm ngang trên di động */
        width: calc(100% - 30px);
        justify-content: center;
        gap: 8px;
      }

      .page-13win21__floating-button {
        padding: 10px 15px;
        font-size: 0.9em;
        flex: 1; /* Phân phối không gian đều */
        min-width: unset;
      }

      /* List items responsive */
      .page-13win21__promotions-grid,
      .page-13win21__product-grid,
      .page-13win21__features-grid,
      .page-13win21__logos-grid {
        grid-template-columns: 1fr;
        gap: 15px;
      }

      .page-13win21__promotion-card,
      .page-13win21__product-item,
      .page-13win21__feature-card,
      .page-13win21__logo-item,
      .page-13win21__faq-item {
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 15px !important; /* Điều chỉnh padding cho di động */
      }

      .page-13win21__faq-list {
        padding: 0 10px; /* Điều chỉnh padding cho di động */
      }

      .page-13win21__faq-question {
        padding: 12px 15px;
        font-size: 1em;
      }

      .page-13win21__faq-answer {
        padding: 15px !important;
      }

      .page-13win21__promotion-description,
      .page-13win21__product-description,
      .page-13win21__feature-description {
        word-wrap: break-word !important;
        overflow-wrap: break-word !important;
        word-break: break-word !important;
      }

      /* Image responsive */
      .page-13win21__promotion-image,
      .page-13win21__product-image,
      .page-13win21__feature-icon,
      .page-13win21__logo-image {
        max-width: 100% !important;
        height: auto !important;
        box-sizing: border-box !important;
        min-width: 200px !important; /* Đảm bảo kích thước tối thiểu 200px */
        min-height: 200px !important;
      }
    }

    @media (max-width: 480px) {
      .page-13win21__hero-title {
        font-size: 1.8em;
      }
      .page-13win21__floating-buttons {
        flex-direction: column; /* Xếp chồng trên màn hình rất nhỏ */
        align-items: stretch;
      }
      .page-13win21__floating-button {
        width: 100%;
      }
    }