:root {
  --primary-color: #017439; /* Main green */
  --secondary-color: #FFFFFF; /* Auxiliary white */
  --btn-register-login-bg: #C30808; /* Red for register/login buttons */
  --btn-register-login-text: #FFFF00; /* Yellow for register/login text */
  --text-dark: #333333; /* Dark text for light backgrounds */
  --text-light: #ffffff; /* Light text for dark backgrounds */
  --background-light: #ffffff; /* Default light background */
  --border-light: #e0e0e0; /* Light border */
}

.page-download {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark); /* Default text color for light body background */
  background: var(--background-light); /* Default body background */
  padding-top: var(--header-offset, 120px); /* Ensure content is below fixed header */
}

.page-download__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
  box-sizing: border-box;
}

.page-download__text-center {
  text-align: center;
}

.page-download__section-title {
  font-size: 36px;
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 20px;
  font-weight: bold;
}

.page-download__section-description {
  font-size: 18px;
  color: var(--text-dark);
  text-align: center;
  margin-bottom: 40px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Hero Section */
.page-download__hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
  background: linear-gradient(135deg, var(--primary-color), #004d26); /* Darker green gradient */
  color: var(--text-light);
  padding-top: 0; /* Handled by main.page-download */
}

.page-download__hero-container {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1; /* Ensure content is above any potential background effects */
}

.page-download__hero-image {
  width: 100%;
  margin-bottom: 30px;
  max-width: 1000px; /* Limit image width */
}

.page-download__hero-image img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  border-radius: 8px;
  object-fit: cover;
}

.page-download__hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 100%;
}

.page-download__hero-title {
  font-size: 48px;
  margin-bottom: 20px;
  font-weight: bold;
  color: var(--text-light);
  line-height: 1.2;
}

.page-download__hero-description {
  font-size: 20px;
  margin-bottom: 30px;
  color: var(--secondary-color);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.page-download__cta-button,
.page-download__btn-primary {
  display: inline-block;
  padding: 15px 40px;
  background: var(--btn-register-login-bg); /* Red */
  color: var(--btn-register-login-text); /* Yellow */
  text-decoration: none;
  border-radius: 5px;
  font-size: 20px;
  font-weight: bold;
  margin-top: 20px;
  margin-bottom: 10px;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  box-sizing: border-box;
}

.page-download__cta-button:hover,
.page-download__btn-primary:hover {
  background: #a30606; /* Darker red on hover */
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}

.page-download__btn-secondary,
.page-download__register-button {
  display: inline-block;
  padding: 15px 40px;
  background: transparent;
  color: var(--secondary-color); /* White */
  text-decoration: none;
  border-radius: 5px;
  font-size: 20px;
  font-weight: bold;
  margin-top: 20px;
  margin-left: 15px;
  border: 2px solid var(--secondary-color); /* White border */
  transition: all 0.3s ease;
  cursor: pointer;
  box-sizing: border-box;
}

.page-download__btn-secondary:hover,
.page-download__register-button:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}


/* General Section Styling */
.page-download__dark-section {
  background: var(--primary-color);
  color: var(--text-light);
  padding: 80px 0;
}

.page-download__dark-section .page-download__section-title {
  color: var(--text-light);
}

.page-download__dark-section .page-download__section-description {
  color: var(--secondary-color);
}

.page-download__light-bg {
  background: var(--background-light);
  color: var(--text-dark);
  padding: 80px 0;
}

/* Why Download Section */
.page-download__features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-download__feature-item {
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  background: var(--secondary-color);
  color: var(--text-dark);
  border: 1px solid var(--border-light);
}

.page-download__feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.page-download__feature-title {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.page-download__feature-text {
  font-size: 16px;
  line-height: 1.7;
}

/* How to Download Section */
.page-download__download-platform {
  margin-bottom: 60px;
}

.page-download__platform-title {
  font-size: 32px;
  color: var(--secondary-color);
  text-align: center;
  margin-top: 50px;
  margin-bottom: 30px;
  font-weight: bold;
}

.page-download__platform-content {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap; /* Allow wrapping on smaller screens */
  justify-content: center;
}

.page-download__steps {
  flex: 2;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  min-width: 0; /* Allow flex item to shrink */
}

.page-download__step-item {
  position: relative;
  padding: 25px;
  padding-left: 70px; /* Space for step number */
  border-radius: 10px;
  background: var(--secondary-color);
  color: var(--text-dark);
  border: 1px solid var(--border-light);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.page-download__step-number {
  position: absolute;
  top: 25px;
  left: 25px;
  width: 35px;
  height: 35px;
  background: var(--primary-color);
  color: var(--secondary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
}

.page-download__step-heading {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.page-download__step-text {
  font-size: 15px;
  line-height: 1.6;
}

.page-download__qr-code {
  flex: 1;
  min-width: 280px; /* Minimum width for QR code section */
  text-align: center;
  padding: 30px;
  background: rgba(255, 255, 255, 0.1); /* Slightly transparent white on dark background */
  border-radius: 10px;
  border: 1px dashed var(--secondary-color);
  box-sizing: border-box;
}

.page-download__qr-code img {
  width: 250px;
  height: 250px;
  margin: 0 auto 20px auto;
  display: block;
  border-radius: 5px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  max-width: 100%; /* Ensure responsiveness */
  height: auto;
}

.page-download__qr-text {
  font-size: 18px;
  margin-bottom: 20px;
  color: var(--secondary-color);
  font-weight: 500;
}

/* App Features Section */
.page-download__app-features {
  padding: 80px 0;
}

.page-download__features-showcase {
  display: flex;
  align-items: center;
  gap: 50px;
  margin-top: 50px;
  flex-wrap: wrap;
}

.page-download__feature-image {
  flex: 1;
  min-width: 400px;
  max-width: 600px;
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  object-fit: cover;
}

.page-download__feature-list {
  flex: 1;
  list-style: none;
  padding: 0;
  margin: 0;
  min-width: 400px;
}

.page-download__feature-list-item {
  margin-bottom: 25px;
  padding-left: 30px;
  position: relative;
}

.page-download__feature-list-item::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--primary-color);
  font-weight: bold;
  font-size: 20px;
}

.page-download__feature-list-title {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 5px;
  color: var(--primary-color);
}

.page-download__feature-list-text {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
}

/* FAQ Section */
.page-download__faq-section {
  padding: 80px 0;
}

.page-download__faq-list {
  max-width: 900px;
  margin: 40px auto 0 auto;
}

/* FAQ容器样式 */
.page-download__faq-item {
  margin-bottom: 15px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

/* FAQ默认状态 - 答案隐藏 */
.page-download__faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, opacity 0.4s ease;
  padding: 0 20px;
  opacity: 0;
  background: var(--background-light); /* Light background for answers */
  color: var(--text-dark);
}

/* FAQ展开状态 - 🚨 Sử dụng!important và max-height đủ lớn để đảm bảo có thể mở rộng */
.page-download__faq-item.active .page-download__faq-answer {
  max-height: 2000px !important; /* 🚨 Sử dụng!important để đảm bảo ưu tiên, giá trị đủ lớn để chứa mọi nội dung */
  padding: 20px !important;
  opacity: 1;
  background: var(--secondary-color); /* Use white for answer background */
  border-radius: 0 0 8px 8px;
}

/* Question Style */
.page-download__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: var(--secondary-color); /* White background for question */
  border: 1px solid var(--border-light);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.3s ease, border-color 0.3s ease;
  position: relative;
  color: var(--text-dark); /* Dark text for question */
}

.page-download__faq-item.active .page-download__faq-question {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  background: #f0f0f0; /* Slightly darker when active */
}

.page-download__faq-question:hover {
  background: #f5f5f5;
  border-color: #d0d0d0;
}

.page-download__faq-question:active {
  background: #eeeeee;
}

/* Question Title Style */
.page-download__faq-question h3 {
  margin: 0;
  padding: 0;
  flex: 1;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  pointer-events: none; /* Prevent h3 from blocking click event */
  color: var(--primary-color); /* Primary color for question title */
}

/* Toggle Icon */
.page-download__faq-toggle {
  font-size: 28px;
  font-weight: bold;
  line-height: 1;
  color: var(--primary-color); /* Primary color for toggle icon */
  transition: transform 0.3s ease, color 0.3s ease;
  flex-shrink: 0;
  margin-left: 15px;
  pointer-events: none; /* Prevent icon from blocking click event */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}

.page-download__faq-item.active .page-download__faq-toggle {
  transform: rotate(45deg); /* Rotate for minus sign effect */
  color: var(--btn-register-login-bg); /* Red when active */
}

/* Final CTA Section */
.page-download__cta-final {
  padding: 80px 0;
  text-align: center;
}

.page-download__cta-final .page-download__cta-button {
  margin-right: 15px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .page-download__hero-title {
    font-size: 42px;
  }
  .page-download__hero-description {
    font-size: 18px;
  }
  .page-download__section-title {
    font-size: 32px;
  }
  .page-download__feature-image,
  .page-download__feature-list {
    min-width: unset; /* Allow shrinking */
    flex-basis: 100%; /* Take full width */
  }
  .page-download__features-showcase {
    flex-direction: column;
  }
  .page-download__feature-image {
    max-width: 800px;
  }
}

@media (max-width: 768px) {
  .page-download {
    font-size: 16px;
    line-height: 1.6;
    padding-top: var(--header-offset, 120px) !important; /* Mobile header offset */
  }

  .page-download__container {
    padding: 30px 15px;
  }

  .page-download__hero-section {
    padding-top: 40px !important; /* Ensure padding for mobile hero */
    padding-bottom: 40px;
  }

  .page-download__hero-title {
    font-size: 32px;
    margin-bottom: 15px;
  }

  .page-download__hero-description {
    font-size: 16px;
    margin-bottom: 20px;
  }

  .page-download__cta-button,
  .page-download__btn-primary,
  .page-download__btn-secondary,
  .page-download__register-button {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding: 12px 20px;
    font-size: 18px;
    margin-left: 0;
    margin-right: 0;
    margin-top: 10px;
  }

  .page-download__cta-final .page-download__cta-button,
  .page-download__cta-final .page-download__register-button {
    margin-left: 0;
    margin-right: 0;
  }

  .page-download__section-title {
    font-size: 28px;
    margin-bottom: 15px;
  }

  .page-download__section-description {
    font-size: 16px;
    margin-bottom: 30px;
  }

  .page-download__features-grid {
    gap: 20px;
  }

  .page-download__feature-item {
    padding: 25px;
  }

  .page-download__feature-title {
    font-size: 20px;
  }

  .page-download__platform-title {
    font-size: 26px;
    margin-top: 40px;
    margin-bottom: 25px;
  }

  .page-download__platform-content {
    flex-direction: column; /* Stack steps and QR code vertically */
    gap: 30px;
  }

  .page-download__steps {
    grid-template-columns: 1fr; /* Single column for steps */
    gap: 20px;
  }

  .page-download__step-item {
    padding: 20px;
    padding-left: 60px;
  }

  .page-download__step-number {
    top: 20px;
    left: 20px;
    width: 30px;
    height: 30px;
    font-size: 16px;
  }

  .page-download__step-heading {
    font-size: 18px;
  }

  .page-download__qr-code {
    min-width: unset;
    padding: 20px;
  }

  .page-download__qr-code img {
    width: 200px;
    height: 200px;
  }

  .page-download__app-features {
    padding: 60px 0;
  }

  .page-download__feature-image {
    min-width: unset;
    width: 100%;
    max-width: 100%;
    border-radius: 8px;
  }

  .page-download__feature-list-item {
    padding-left: 25px;
    margin-bottom: 20px;
  }

  .page-download__feature-list-item::before {
    font-size: 18px;
  }

  .page-download__feature-list-title {
    font-size: 19px;
  }

  .page-download__faq-section {
    padding: 60px 0;
  }

  .page-download__faq-question {
    padding: 15px;
    flex-wrap: wrap;
  }
  
  .page-download__faq-question h3 {
    font-size: 16px;
    width: calc(100% - 40px);
  }
  
  .page-download__faq-toggle {
    margin-left: 10px;
    width: 28px;
    height: 28px;
    font-size: 24px;
  }
  
  .page-download__faq-answer {
    padding: 0 15px;
  }
  
  .page-download__faq-item.active .page-download__faq-answer {
    padding: 15px !important;
  }

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