:root {
      --page-winvnapp-primary-color: #ffcc00; /* Vàng rực rỡ */
      --page-winvnapp-secondary-color: #333333; /* Xám đậm */
      --page-winvnapp-accent-color: #e60000; /* Đỏ mạnh mẽ */
      --page-winvnapp-text-color: #ffffff; /* Trắng */
      --page-winvnapp-dark-bg: #1a1a1a; /* Nền tối */
      --page-winvnapp-light-bg: #2a2a2a; /* Nền sáng hơn */
      --page-winvnapp-border-radius: 10px;
      --page-winvnapp-padding-section: 40px 20px;
      --page-winvnapp-padding-mobile: 25px 15px;
    }

    /* Đảm bảo nội dung không bị che bởi header cố định */
    .page-winvnapp__hero-section {
      padding-top: 120px; /* Điều chỉnh cho desktop */
    }

    @media (max-width: 768px) {
      .page-winvnapp__hero-section {
        padding-top: 100px; /* Điều chỉnh cho mobile */
      }
    }

    .page-winvnapp {
      font-family: 'Arial', sans-serif;
      color: var(--page-winvnapp-text-color);
      background-color: var(--page-winvnapp-dark-bg);
      line-height: 1.6;
    }

    .page-winvnapp h1, .page-winvnapp h2, .page-winvnapp h3, .page-winvnapp h4 {
      color: var(--page-winvnapp-primary-color);
      text-align: center;
      margin-bottom: 20px;
    }

    .page-winvnapp h1 {
      font-size: 2.8em;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
    }

    .page-winvnapp h2 {
      font-size: 2.2em;
      color: var(--page-winvnapp-primary-color);
      margin-top: 40px;
    }

    .page-winvnapp h3 {
      font-size: 1.6em;
      color: var(--page-winvnapp-text-color);
    }

    .page-winvnapp p {
      margin-bottom: 15px;
      color: #e0e0e0;
    }

    .page-winvnapp a {
      color: var(--page-winvnapp-primary-color);
      text-decoration: none;
      transition: color 0.3s ease;
    }

    .page-winvnapp a:hover {
      color: var(--page-winvnapp-accent-color);
    }

    .page-winvnapp__section {
      padding: var(--page-winvnapp-padding-section);
      max-width: 1200px;
      margin: 0 auto;
      background-color: var(--page-winvnapp-light-bg);
      border-radius: var(--page-winvnapp-border-radius);
      margin-bottom: 30px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }

    .page-winvnapp__hero-section {
      background-color: var(--page-winvnapp-dark-bg);
      padding: 0; /* padding-top đã được xử lý ở trên */
      margin-bottom: 30px;
      text-align: center;
      position: relative;
      overflow: hidden;
      border-radius: 0;
      box-shadow: none;
    }

    .page-winvnapp__hero-banner {
      width: 100%;
      height: auto;
      max-width: 100%;
      display: block;
      margin: 0 auto;
      border-radius: 0;
      object-fit: cover;
    }

    .page-winvnapp__hero-content {
      position: relative;
      z-index: 2;
      padding: 20px;
      background: linear-gradient(to top, rgba(26, 26, 26, 0.8), transparent);
      margin-top: -80px; /* Kéo lên trên banner */
      padding-top: 100px; /* Để bù lại cho margin-top */
    }

    .page-winvnapp__hero-title {
      margin-bottom: 15px;
      font-size: 3em;
      line-height: 1.2;
    }

    .page-winvnapp__hero-subtitle {
      font-size: 1.4em;
      color: #ccc;
      margin-bottom: 30px;
    }

    .page-winvnapp__login-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-winvnapp-accent-color);
      color: var(--page-winvnapp-text-color);
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.2em;
      font-weight: bold;
      text-transform: uppercase;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      transition: background-color 0.3s ease, transform 0.2s ease;
      animation: pulse 2s infinite;
      border: none;
      cursor: pointer;
    }

    .page-winvnapp__login-button:hover {
      background-color: #ff3333;
      transform: scale(1.05);
    }

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

    .page-winvnapp__grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-top: 30px;
    }

    .page-winvnapp__card {
      background-color: var(--page-winvnapp-dark-bg);
      border-radius: var(--page-winvnapp-border-radius);
      overflow: hidden;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
      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-winvnapp__card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.7);
    }

    .page-winvnapp__card-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      border-bottom: 3px solid var(--page-winvnapp-primary-color);
    }

    .page-winvnapp__card-content {
      padding: 20px 15px;
    }

    .page-winvnapp__card-title {
      font-size: 1.3em;
      margin-top: 15px;
      margin-bottom: 10px;
      color: var(--page-winvnapp-primary-color);
    }

    .page-winvnapp__card-title a {
      color: var(--page-winvnapp-primary-color);
    }

    .page-winvnapp__card-text {
      font-size: 0.95em;
      color: #c0c0c0;
    }

    .page-winvnapp__download-steps {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 30px;
    }

    .page-winvnapp__step-item {
      background-color: var(--page-winvnapp-dark-bg);
      padding: 20px;
      border-radius: var(--page-winvnapp-border-radius);
      display: flex;
      align-items: center;
      gap: 20px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    }

    .page-winvnapp__step-number {
      background-color: var(--page-winvnapp-primary-color);
      color: var(--page-winvnapp-dark-bg);
      width: 40px;
      height: 40px;
      min-width: 40px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      font-size: 1.5em;
    }

    .page-winvnapp__step-content h3 {
      text-align: left;
      margin-top: 0;
      margin-bottom: 5px;
      color: var(--page-winvnapp-primary-color);
    }

    .page-winvnapp__step-content p {
      margin-bottom: 0;
      color: #e0e0e0;
    }

    .page-winvnapp__promo-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 30px;
    }

    .page-winvnapp__promo-item {
      background-color: var(--page-winvnapp-dark-bg);
      padding: 20px;
      border-radius: var(--page-winvnapp-border-radius);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .page-winvnapp__promo-icon {
      width: 60px;
      height: 60px;
      min-width: 60px;
      object-fit: contain;
      border-radius: 5px;
    }

    .page-winvnapp__promo-text h3 {
      text-align: left;
      margin-top: 0;
      margin-bottom: 5px;
      color: var(--page-winvnapp-accent-color);
    }

    .page-winvnapp__promo-text p {
      margin-bottom: 0;
      color: #e0e0e0;
    }

    .page-winvnapp__providers-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      gap: 20px;
      margin-top: 30px;
      justify-items: center;
    }

    .page-winvnapp__provider-logo {
      width: 100%;
      max-width: 150px;
      height: auto;
      object-fit: contain;
      background-color: var(--page-winvnapp-dark-bg);
      padding: 10px;
      border-radius: var(--page-winvnapp-border-radius);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
      transition: transform 0.2s ease;
      min-width: 200px; /* Enforce min size for images */
      min-height: 200px; /* Enforce min size for images */
    }

    .page-winvnapp__provider-logo:hover {
      transform: scale(1.05);
    }

    .page-winvnapp__why-choose-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
      margin-top: 30px;
    }

    .page-winvnapp__why-choose-item {
      background-color: var(--page-winvnapp-dark-bg);
      padding: 15px 20px;
      border-left: 5px solid var(--page-winvnapp-primary-color);
      border-radius: var(--page-winvnapp-border-radius);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    }

    .page-winvnapp__why-choose-item h3 {
      text-align: left;
      margin-top: 0;
      margin-bottom: 5px;
      color: var(--page-winvnapp-primary-color);
    }

    .page-winvnapp__why-choose-item p {
      margin-bottom: 0;
      color: #e0e0e0;
    }

    .page-winvnapp__faq-list {
      margin-top: 30px;
    }

    .page-winvnapp__faq-item {
      background-color: var(--page-winvnapp-dark-bg);
      margin-bottom: 10px;
      border-radius: var(--page-winvnapp-border-radius);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    }

    .page-winvnapp__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      cursor: pointer;
      background-color: #3a3a3a;
      border-bottom: 1px solid #4a4a4a;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-winvnapp__faq-question:hover {
      background-color: #4a4a4a;
    }

    .page-winvnapp__faq-question h3 {
      margin: 0;
      font-size: 1.15em;
      color: var(--page-winvnapp-primary-color);
      text-align: left;
      pointer-events: none; /* Ngăn chặn sự kiện click trên h3 */
    }

    .page-winvnapp__faq-toggle {
      font-size: 1.8em;
      font-weight: bold;
      color: var(--page-winvnapp-primary-color);
      transition: transform 0.3s ease;
      pointer-events: none; /* Ngăn chặn sự kiện click trên toggle */
    }

    .page-winvnapp__faq-item.active .page-winvnapp__faq-toggle {
      transform: rotate(45deg); /* Biến đổi '+' thành 'x' hoặc '-' */
      content: '−'; /* Cập nhật thông qua JS */
    }

    .page-winvnapp__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 15px;
      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;
    }

    .page-winvnapp__faq-item.active .page-winvnapp__faq-answer {
      max-height: 2000px !important; /* Đủ lớn để chứa mọi nội dung */
      padding: 20px 15px !important;
      opacity: 1;
    }

    .page-winvnapp__cta-section {
      text-align: center;
      padding: var(--page-winvnapp-padding-section);
      background-color: var(--page-winvnapp-accent-color);
      border-radius: var(--page-winvnapp-border-radius);
      margin-bottom: 30px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }

    .page-winvnapp__cta-section h2 {
      color: var(--page-winvnapp-text-color);
      margin-bottom: 20px;
    }

    .page-winvnapp__cta-button {
      background-color: var(--page-winvnapp-primary-color);
      color: var(--page-winvnapp-dark-bg);
      padding: 15px 30px;
      border-radius: 50px;
      font-size: 1.3em;
      font-weight: bold;
      text-transform: uppercase;
      transition: background-color 0.3s ease, transform 0.2s ease;
      display: inline-block;
    }

    .page-winvnapp__cta-button:hover {
      background-color: #fff;
      transform: scale(1.05);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-winvnapp h1 {
        font-size: 2em;
      }
      .page-winvnapp h2 {
        font-size: 1.8em;
      }
      .page-winvnapp h3 {
        font-size: 1.3em;
      }
      .page-winvnapp__section {
        padding: var(--page-winvnapp-padding-mobile);
        margin-bottom: 20px;
      }
      .page-winvnapp__hero-title {
        font-size: 2.2em;
      }
      .page-winvnapp__hero-subtitle {
        font-size: 1.1em;
      }
      .page-winvnapp__login-button {
        padding: 12px 20px;
        font-size: 1em;
        bottom: 15px;
        right: 15px;
      }
      .page-winvnapp__card-image {
        height: 180px;
      }
      .page-winvnapp__step-item, .page-winvnapp__promo-item {
        flex-direction: column;
        text-align: center;
        gap: 10px;
      }
      .page-winvnapp__step-content h3, .page-winvnapp__promo-text h3 {
        text-align: center;
      }
      .page-winvnapp__faq-question {
        padding: 12px 15px;
      }
      .page-winvnapp__faq-question h3 {
        font-size: 1em;
      }
      .page-winvnapp__faq-toggle {
        font-size: 1.5em;
      }
      .page-winvnapp__faq-item.active .page-winvnapp__faq-answer {
        padding: 15px 15px !important;
      }
      .page-winvnapp__cta-button {
        font-size: 1.1em;
        padding: 12px 25px;
      }
      /* Responsive image optimization */
      .page-winvnapp img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-winvnapp__card-image,
      .page-winvnapp__promo-icon,
      .page-winvnapp__provider-logo,
      .page-winvnapp__hero-banner {
        width: 100% !important;
        max-width: 100% !important;
        height: auto !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
      .page-winvnapp__provider-logo {
        min-width: unset; /* Allow smaller on mobile if needed, but still > 200px */
        min-height: unset;
        width: 150px; /* Example, adjust as needed */
        height: 150px;
      }
    }

    @media (max-width: 480px) {
      .page-winvnapp h1 {
        font-size: 1.8em;
      }
      .page-winvnapp__hero-title {
        font-size: 1.8em;
      }
      .page-winvnapp__hero-subtitle {
        font-size: 0.9em;
      }
      .page-winvnapp__grid {
        grid-template-columns: 1fr;
      }
      .page-winvnapp__provider-logo {
        width: 120px;
        height: 120px;
      }
    }