.page-download-guide-android-app-installation {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f8f8f8;
}

.page-download-guide-android-app-installation .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.page-download-guide-android-app-installation .hero-section {
  background: linear-gradient(135deg, #1A237E 0%, #3f4a9b 100%);
  color: #fff;
  padding: 80px 0;
  text-align: center;
}

.page-download-guide-android-app-installation .hero-title {
  font-size: 2.8em;
  margin-bottom: 20px;
  color: #FFD700;
  font-weight: bold;
}

.page-download-guide-android-app-installation .hero-description {
  font-size: 1.2em;
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.page-download-guide-android-app-installation .btn {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  cursor: pointer;
  font-size: 1em;
}

.page-download-guide-android-app-installation .btn-primary {
  background-color: #FFD700;
  color: #1A237E;
  border: 2px solid #FFD700;
}

.page-download-guide-android-app-installation .btn-primary:hover {
  background-color: #e5c100;
  border-color: #e5c100;
  color: #0d124b;
}

.page-download-guide-android-app-installation .btn-secondary {
  background-color: #1A237E;
  color: #FFD700;
  border: 2px solid #FFD700;
  margin-left: 15px;
}

.page-download-guide-android-app-installation .btn-secondary:hover {
  background-color: #0d124b;
  border-color: #e5c100;
  color: #fff;
}

.page-download-guide-android-app-installation .btn-large {
  padding: 15px 35px;
  font-size: 1.1em;
}

.page-download-guide-android-app-installation .content-section {
  padding: 60px 0;
  background-color: #fff;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.page-download-guide-android-app-installation .section-intro {
  background-color: #f0f4f7;
}

.page-download-guide-android-app-installation .section-title {
  font-size: 2em;
  color: #1A237E;
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.page-download-guide-android-app-installation .section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: #FFD700;
  margin: 10px auto 0;
  border-radius: 2px;
}

.page-download-guide-android-app-installation p {
  margin-bottom: 15px;
  font-size: 1.05em;
  color: #555;
}

.page-download-guide-android-app-installation .highlight-keyword {
  color: #1A237E;
  font-weight: bold;
}

.page-download-guide-android-app-installation .grid-3-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.page-download-guide-android-app-installation .preparation-item {
  text-align: center;
  padding: 25px;
  border: 1px solid #eee;
  border-radius: 8px;
  background-color: #fff;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-download-guide-android-app-installation .preparation-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.page-download-guide-android-app-installation .item-icon {
  width: 70px;
  height: 70px;
  margin-bottom: 20px;
  object-fit: contain;
}

.page-download-guide-android-app-installation .item-title {
  font-size: 1.3em;
  color: #1A237E;
  margin-bottom: 15px;
}

.page-download-guide-android-app-installation .step-by-step-guide {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 40px;
}

.page-download-guide-android-app-installation .step-item {
  display: flex;
  align-items: flex-start;
  gap: 25px;
}

.page-download-guide-android-app-installation .step-number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: #FFD700;
  color: #1A237E;
  font-size: 1.8em;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.page-download-guide-android-app-installation .step-content {
  flex-grow: 1;
}

.page-download-guide-android-app-installation .step-title {
  font-size: 1.5em;
  color: #1A237E;
  margin-top: 0;
  margin-bottom: 15px;
}

.page-download-guide-android-app-installation .step-image {
  width: 100%;
  max-width: 500px;
  height: auto;
  margin-top: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.page-download-guide-android-app-installation .link-contact-support {
  color: #1A237E;
  font-weight: bold;
  text-decoration: none;
}

.page-download-guide-android-app-installation .link-contact-support:hover {
  text-decoration: underline;
  color: #FFD700;
}

.page-download-guide-android-app-installation .troubleshooting-list {
  list-style: none;
  padding-left: 0;
}

.page-download-guide-android-app-installation .troubleshooting-list li {
  background-color: #fdfdfd;
  border-left: 4px solid #FFD700;
  padding: 15px 20px;
  margin-bottom: 15px;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.page-download-guide-android-app-installation .troubleshooting-list li strong {
  color: #1A237E;
}

.page-download-guide-android-app-installation .cta-buttons {
  text-align: center;
  margin-top: 40px;
}

.page-download-guide-android-app-installation .section-image {
  display: block;
  max-width: 700px;
  margin: 30px auto 0;
  border-radius: 8px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.page-download-guide-android-app-installation .why-qq88-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.page-download-guide-android-app-installation .why-qq88-list li {
  background-color: #f0f4f7;
  padding: 20px;
  border-radius: 8px;
  border-left: 5px solid #1A237E;
  transition: background-color 0.3s ease;
}

.page-download-guide-android-app-installation .why-qq88-list li:hover {
  background-color: #e6edf2;
}

.page-download-guide-android-app-installation .why-qq88-list li strong {
  color: #1A237E;
  font-size: 1.1em;
  display: block;
  margin-bottom: 5px;
}

.page-download-guide-android-app-installation .mt-3 {
  margin-top: 1rem !important;
}

.page-download-guide-android-app-installation .mt-4 {
  margin-top: 1.5rem !important;
}

.page-download-guide-android-app-installation .mt-5 {
  margin-top: 3rem !important;
}

@media (max-width: 768px) {
  .page-download-guide-android-app-installation .hero-title {
    font-size: 2em;
  }
  .page-download-guide-android-app-installation .hero-description {
    font-size: 1em;
  }
  .page-download-guide-android-app-installation .section-title {
    font-size: 1.7em;
  }
  .page-download-guide-android-app-installation .step-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .page-download-guide-android-app-installation .step-number {
    margin-bottom: 20px;
  }
  .page-download-guide-android-app-installation .btn-secondary {
    margin-left: 0;
    margin-top: 15px;
  }
  .page-download-guide-android-app-installation .cta-buttons .btn {
    display: block;
    width: 100%;
    margin-left: 0;
    margin-bottom: 15px;
  }
}

@media (max-width: 480px) {
  .page-download-guide-android-app-installation .hero-title {
    font-size: 1.6em;
  }
  .page-download-guide-android-app-installation .section-title {
    font-size: 1.4em;
  }
  .page-download-guide-android-app-installation .item-title {
    font-size: 1.1em;
  }
  .page-download-guide-android-app-installation .step-title {
    font-size: 1.2em;
  }
}