/* style/download.css */
/* body đã padding-top: var(--header-offset)；tránh trùng lặp */

.page-download {
  font-family: 'Arial', sans-serif;
  color: var(--text-main);
  background-color: var(--background);
}

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

.page-download__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0 60px 0; /* body đã có padding-top, chỉ cần 10px nhỏ cho phần này */
  background-color: var(--background);
  overflow: hidden;
}

.page-download__hero-image-wrapper {
  width: 100%;
  max-height: 700px; /* Giới hạn chiều cao của hình ảnh hero */
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 30px;
}

.page-download__hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: 10px;
}

.page-download__hero-content {
  text-align: center;
  max-width: 800px;
  padding: 0 20px;
}

.page-download__main-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: bold;
  color: var(--text-main);
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.page-download__tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
}

.page-download__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.page-download__btn-primary,
.page-download__btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 30px;
  border-radius: 8px;
  font-weight: bold;
  font-size: 1.1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  min-width: 180px;
  box-sizing: border-box;
}

.page-download__btn-primary {
  background: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  color: var(--text-main);
  border: none;
  box-shadow: 0 4px 15px rgba(0, 255, 100, 0.3);
}

.page-download__btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 255, 100, 0.4);
}

.page-download__btn-secondary {
  background: transparent;
  color: var(--glow);
  border: 2px solid var(--border-color);
}

.page-download__btn-secondary:hover {
  background-color: rgba(var(--glow), 0.1);
  border-color: var(--glow);
  transform: translateY(-3px);
}

.page-download__section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: bold;
  color: var(--text-main);
  text-align: center;
  margin-bottom: 20px;
  padding-top: 40px;
}

.page-download__section-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 900px;
  margin: 0 auto 50px auto;
  line-height: 1.6;
}

/* Features Section */
.page-download__features-section {
  padding: 80px 0;
  background-color: var(--card-bg);
}

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

.page-download__feature-card {
  background-color: var(--background);
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border-color);
}

.page-download__feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}

.page-download__feature-icon {
  width: 100%;
  height: auto;
  max-width: 250px;
  max-height: 250px;
  object-fit: contain;
  margin: 0 auto 20px auto;
  display: block;
  border-radius: 8px;
}

.page-download__feature-title {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--text-main);
  margin-bottom: 15px;
}

.page-download__feature-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Steps Section */
.page-download__steps-section {
  padding: 80px 0;
  background-color: var(--background);
}

.page-download__steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.page-download__step-card {
  background-color: var(--card-bg);
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  border: 1px solid var(--border-color);
}

.page-download__step-number {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--glow);
  margin-bottom: 15px;
  text-align: center;
}

.page-download__step-title {
  font-size: 1.4rem;
  font-weight: bold;
  color: var(--text-main);
  margin-bottom: 10px;
  text-align: center;
}

.page-download__step-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  text-align: justify;
}

.page-download__cta-center {
  text-align: center;
  margin-top: 60px;
}

/* Promo Video Section */
.page-download__promo-video-section {
  padding: 80px 0;
  background-color: var(--card-bg);
}

.page-download__video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 8px 25px rgba(0,0,0,0.4);
  margin: 0 auto 20px auto;
  max-width: 960px; /* Match video width */
  width: 100%; /* Desktop width */
  box-sizing: border-box;
}

.page-download__video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  cursor: pointer;
}

.page-download__video-caption {
  font-size: 0.95rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 15px;
}

/* FAQ Section */
.page-download__faq-section {
  padding: 80px 0;
  background-color: var(--background);
}

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

.page-download__faq-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.page-download__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 25px;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--text-main);
  cursor: pointer;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--divider);
  list-style: none; /* For details/summary */
}

.page-download__faq-question::-webkit-details-marker {
  display: none;
}

.page-download__faq-question:hover {
  background-color: rgba(var(--glow), 0.05);
}

.page-download__faq-qtext {
  flex-grow: 1;
}

.page-download__faq-toggle {
  font-size: 1.8rem;
  font-weight: lighter;
  color: var(--glow);
  margin-left: 15px;
  line-height: 1;
}

.page-download__faq-item[open] .page-download__faq-question {
  border-bottom-color: transparent;
}

.page-download__faq-item[open] .page-download__faq-toggle {
  content: '−';
}

.page-download__faq-answer {
  padding: 0 25px 20px 25px;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.page-download__faq-item[open] .page-download__faq-answer {
  max-height: 500px; /* Adjust as needed */
  padding-top: 15px;
}

/* Final CTA Section */
.page-download__final-cta-section {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--deep-green) 0%, var(--main-color) 100%);
  color: var(--text-main);
}

.page-download__final-cta-section .page-download__section-title {
  color: var(--text-main);
}

.page-download__final-cta-section .page-download__section-description {
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .page-download__hero-section {
    padding-bottom: 40px;
  }

  .page-download__main-title {
    font-size: clamp(2.2rem, 4.5vw, 3rem);
  }

  .page-download__tagline {
    font-size: 1.1rem;
  }

  .page-download__section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  }

  .page-download__section-description {
    font-size: 1rem;
  }

  .page-download__features-grid,
  .page-download__steps-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

  .page-download__btn-primary,
  .page-download__btn-secondary {
    font-size: 1rem;
    padding: 12px 25px;
  }
}

@media (max-width: 768px) {
  .page-download {
    font-size: 16px;
    line-height: 1.6;
  }

  .page-download__hero-section {
    padding-top: 10px !important;
    padding-bottom: 30px;
  }

  .page-download__hero-image-wrapper {
    margin-bottom: 20px;
  }

  .page-download__hero-content {
    padding: 0 15px;
  }

  .page-download__main-title {
    font-size: clamp(2rem, 7vw, 2.5rem);
    margin-bottom: 15px;
  }

  .page-download__tagline {
    font-size: 1rem;
    margin-bottom: 30px;
  }

  .page-download__cta-buttons {
    flex-direction: column;
    gap: 15px;
    width: 100%;
    padding: 0 15px;
    box-sizing: border-box;
  }

  .page-download__btn-primary,
  .page-download__btn-secondary {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-download__container {
    padding: 0 15px;
  }

  .page-download__section-title {
    font-size: clamp(1.6rem, 6vw, 2rem);
    padding-top: 30px;
    margin-bottom: 15px;
  }

  .page-download__section-description {
    font-size: 0.95rem;
    margin-bottom: 30px;
  }

  .page-download__features-section,
  .page-download__steps-section,
  .page-download__promo-video-section,
  .page-download__faq-section,
  .page-download__final-cta-section {
    padding: 40px 0;
  }

  .page-download__feature-card,
  .page-download__step-card {
    padding: 20px;
  }

  .page-download__feature-title,
  .page-download__step-title {
    font-size: 1.3rem;
  }

  .page-download__feature-text,
  .page-download__step-text {
    font-size: 0.9rem;
  }

  /* Image responsive rules */
  .page-download img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-download__section,
  .page-download__card,
  .page-download__container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  /* Video responsive rules */
  .page-download video,
  .page-download__video {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-download__video-section,
  .page-download__video-container,
  .page-download__video-wrapper {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important;
  }
  .page-download__promo-video-section {
    padding-top: 10px !important; /* body đã承担 --header-offset，此处禁止 var(--header-offset) */
  }

  .page-download__faq-question {
    font-size: 1.1rem;
    padding: 15px 20px;
  }

  .page-download__faq-answer {
    padding: 0 20px 15px 20px;
  }
}

@media (max-width: 480px) {
  .page-download__main-title {
    font-size: clamp(1.8rem, 8vw, 2.2rem);
  }
  .page-download__tagline {
    font-size: 0.9rem;
  }
  .page-download__section-title {
    font-size: clamp(1.4rem, 7vw, 1.8rem);
  }
  .page-download__btn-primary,
  .page-download__btn-secondary {
    padding: 12px 15px;
    font-size: 0.95rem;
  }
}

/* Color Contrast Fixes (if needed, applied via JS or manually) */
.page-download__dark-section {
  background-color: var(--card-bg);
  color: var(--text-main);
}

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

.page-download__final-cta-section {
  background: linear-gradient(135deg, var(--deep-green) 0%, var(--main-color) 100%);
  color: var(--text-main);
}

.page-download__final-cta-section .page-download__section-title {
  color: var(--text-main);
}

.page-download__final-cta-section .page-download__section-description {
  color: var(--text-secondary);
}

.page-download__cta-center .page-download__btn-primary {
  background: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  color: var(--text-main);
}

.page-download__cta-center .page-download__btn-primary:hover {
  background: linear-gradient(180deg, #13994A 0%, #2AD16F 100%);
}