:root {
      --page-13windownload-primary-color: #e44d26; /* Cam đỏ */
      --page-13windownload-secondary-color: #333; /* Xám đậm */
      --page-13windownload-accent-color: #ffcc00; /* Vàng */
      --page-13windownload-text-color: #f5f5f5; /* Trắng nhạt */
      --page-13windownload-bg-dark: #1a1a1a; /* Nền tối */
      --page-13windownload-bg-light: #2a2a2a; /* Nền sáng hơn */
      --page-13windownload-gradient-start: #3a1c71; /* Tím đậm */
      --page-13windownload-gradient-end: #d76d77; /* Hồng */
    }

    .page-13windownload {
      font-family: 'Arial', sans-serif;
      color: var(--page-13windownload-text-color);
      background-color: var(--page-13windownload-bg-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .page-13windownload__hero-section {
      position: relative;
      width: 100%;
      min-height: 400px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      padding: 10px 20px 60px; /* Adjusted padding-top for fixed header */
      background: linear-gradient(135deg, var(--page-13windownload-gradient-start) 0%, var(--page-13windownload-gradient-end) 100%);
      box-sizing: border-box;
      overflow: hidden;
    }

    .page-13windownload__hero-image-wrapper {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      opacity: 0.3;
      overflow: hidden;
    }

    .page-13windownload__hero-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: brightness(0.7); /* Allowed for background images to improve text readability */
      max-width: 100%;
    }

    .page-13windownload__hero-content {
      position: relative;
      z-index: 1;
      max-width: 900px;
    }

    .page-13windownload__hero-title {
      font-size: 2.8em;
      color: var(--page-13windownload-accent-color);
      margin-bottom: 15px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
      line-height: 1.2;
    }

    .page-13windownload__hero-subtitle {
      font-size: 1.3em;
      color: var(--page-13windownload-text-color);
      margin-bottom: 30px;
      font-weight: 300;
    }

    .page-13windownload__download-button {
      display: inline-block;
      background-color: var(--page-13windownload-primary-color);
      color: #fff;
      padding: 15px 30px;
      border-radius: 50px;
      font-size: 1.2em;
      font-weight: bold;
      text-decoration: none;
      transition: background-color 0.3s ease, transform 0.3s ease;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      cursor: pointer;
      border: none;
      outline: none;
    }

    .page-13windownload__download-button:hover {
      background-color: #ff6633;
      transform: translateY(-3px);
    }

    .page-13windownload__section {
      padding: 60px 20px;
      text-align: center;
      background-color: var(--page-13windownload-bg-light);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      box-sizing: border-box;
    }

    .page-13windownload__section:nth-of-type(even) {
      background-color: var(--page-13windownload-bg-dark);
    }

    .page-13windownload__section-title {
      font-size: 2.2em;
      color: var(--page-13windownload-accent-color);
      margin-bottom: 40px;
      position: relative;
      display: inline-block;
      padding-bottom: 10px;
    }

    .page-13windownload__section-title::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--page-13windownload-primary-color);
      border-radius: 2px;
    }

    .page-13windownload__text-content {
      max-width: 800px;
      margin: 0 auto 40px;
      font-size: 1.1em;
      color: var(--page-13windownload-text-color);
    }

    .page-13windownload__features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 30px;
      max-width: 1200px;
      margin: 0 auto;
      text-align: left;
    }

    .page-13windownload__feature-item {
      background-color: var(--page-13windownload-bg-dark);
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .page-13windownload__feature-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    }

    .page-13windownload__feature-icon-wrapper {
      width: 100%;
      height: 200px; /* Minimum size */
      margin-bottom: 20px;
      overflow: hidden;
      border-radius: 8px;
    }

    .page-13windownload__feature-icon {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 8px;
      max-width: 100%;
    }

    .page-13windownload__feature-title {
      font-size: 1.5em;
      color: var(--page-13windownload-primary-color);
      margin-bottom: 15px;
    }

    .page-13windownload__feature-description {
      font-size: 1em;
      color: var(--page-13windownload-text-color);
    }

    .page-13windownload__steps-list {
      list-style: none;
      padding: 0;
      max-width: 700px;
      margin: 0 auto;
      text-align: left;
    }

    .page-13windownload__step-item {
      background-color: var(--page-13windownload-bg-dark);
      margin-bottom: 20px;
      padding: 25px;
      border-radius: 8px;
      display: flex;
      align-items: flex-start;
      box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    }

    .page-13windownload__step-number {
      background-color: var(--page-13windownload-primary-color);
      color: #fff;
      border-radius: 50%;
      width: 40px;
      height: 40px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      font-size: 1.2em;
      flex-shrink: 0;
      margin-right: 20px;
    }

    .page-13windownload__step-content h3 {
      font-size: 1.4em;
      color: var(--page-13windownload-accent-color);
      margin-top: 0;
      margin-bottom: 10px;
    }

    .page-13windownload__step-content p {
      font-size: 1em;
      color: var(--page-13windownload-text-color);
      margin-bottom: 0;
    }

    .page-13windownload__game-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 25px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .page-13windownload__game-card {
      background-color: var(--page-13windownload-bg-dark);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: center;
    }

    .page-13windownload__game-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    }

    .page-13windownload__game-image-wrapper {
      width: 100%;
      height: 220px; /* Minimum size */
      overflow: hidden;
    }

    .page-13windownload__game-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      max-width: 100%;
    }

    .page-13windownload__game-info {
      padding: 20px;
    }

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

    .page-13windownload__game-description {
      font-size: 0.95em;
      color: var(--page-13windownload-text-color);
      margin-bottom: 15px;
    }

    .page-13windownload__faq-section {
      padding: 60px 20px;
      background-color: var(--page-13windownload-bg-light);
      text-align: center;
      box-sizing: border-box;
    }

    .page-13windownload__faq-container {
      max-width: 800px;
      margin: 0 auto;
      text-align: left;
    }

    .page-13windownload__faq-item {
      background-color: var(--page-13windownload-bg-dark);
      margin-bottom: 15px;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    }

    .page-13windownload__faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 25px;
      cursor: pointer;
      background-color: var(--page-13windownload-bg-dark);
      color: var(--page-13windownload-accent-color);
      font-size: 1.2em;
      font-weight: bold;
      transition: background-color 0.3s ease;
      user-select: none;
    }

    .page-13windownload__faq-question:hover {
      background-color: #3a3a3a;
    }

    .page-13windownload__faq-question h3 {
      margin: 0;
      color: inherit;
      pointer-events: none; /* Prevent h3 from blocking click event */
    }

    .page-13windownload__faq-toggle {
      font-size: 1.5em;
      line-height: 1;
      pointer-events: none; /* Prevent toggle from blocking click event */
      transition: transform 0.3s ease;
    }

    .page-13windownload__faq-item.active .page-13windownload__faq-toggle {
      transform: rotate(45deg); /* Change + to X (or similar) */
    }

    .page-13windownload__faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 25px;
      opacity: 0;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
      color: var(--page-13windownload-text-color);
      background-color: #2a2a2a;
    }

    .page-13windownload__faq-item.active .page-13windownload__faq-answer {
      max-height: 2000px !important; /* Sufficiently large to contain content */
      padding: 20px 25px !important;
      opacity: 1;
    }

    .page-13windownload__floating-button {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--page-13windownload-primary-color);
      color: #fff;
      padding: 15px 25px;
      border-radius: 50px;
      font-size: 1.1em;
      font-weight: bold;
      text-decoration: none;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
      z-index: 1000;
      transition: background-color 0.3s ease, transform 0.3s ease;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .page-13windownload__floating-button:hover {
      background-color: #ff6633;
      transform: translateY(-3px);
    }

    /* Responsive adjustments */
    @media (max-width: 768px) {
      .page-13windownload__hero-title {
        font-size: 2em;
      }

      .page-13windownload__hero-subtitle {
        font-size: 1.1em;
      }

      .page-13windownload__download-button {
        padding: 12px 25px;
        font-size: 1.1em;
      }

      .page-13windownload__section {
        padding: 40px 15px;
      }

      .page-13windownload__section-title {
        font-size: 1.8em;
      }

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

      .page-13windownload__features-grid,
      .page-13windownload__game-grid {
        grid-template-columns: 1fr;
      }

      .page-13windownload__feature-item,
      .page-13windownload__step-item,
      .page-13windownload__game-card {
        padding: 20px;
      }

      .page-13windownload__step-number {
        width: 35px;
        height: 35px;
        font-size: 1.1em;
        margin-right: 15px;
      }

      .page-13windownload__step-content h3 {
        font-size: 1.2em;
      }

      .page-13windownload__faq-question {
        font-size: 1.1em;
        padding: 15px 20px;
      }

      .page-13windownload__faq-answer {
        padding: 0 20px;
      }

      .page-13windownload__faq-item.active .page-13windownload__faq-answer {
        padding: 15px 20px !important;
      }

      .page-13windownload__floating-button {
        bottom: 15px;
        right: 15px;
        padding: 12px 20px;
        font-size: 1em;
      }

      .page-13windownload__hero-section {
        padding-top: 10px; /* Specific padding-top for mobile fixed header */
      }
      
      /* Image responsiveness for mobile */
      .page-13windownload img {
        max-width: 100% !important;
        height: auto !important;
      }
      .page-13windownload__hero-image-wrapper,
      .page-13windownload__feature-icon-wrapper,
      .page-13windownload__game-image-wrapper {
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        box-sizing: border-box !important;
      }
    }