/* style/about.css */
/* body đã padding-top: var(--header-offset) từ shared.css; trang này không cần thêm padding-top cho main hoặc các section đầu tiên. */

:root {
  --page-about-bg-color: #08160F;
  --page-about-card-bg: #11271B;
  --page-about-text-main: #F2FFF6;
  --page-about-text-secondary: #A7D9B8;
  --page-about-btn-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  --page-about-border-color: #2E7A4E;
  --page-about-glow-color: #57E38D;
  --page-about-gold-color: #F2C14E;
  --page-about-divider-color: #1E3A2A;
  --page-about-deep-green: #0A4B2C;
}

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

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

.page-about__section {
  padding: 60px 0;
}

.page-about__section-title {
  font-size: 2.8em;
  color: var(--page-about-gold-color);
  text-align: center;
  margin-bottom: 40px;
  font-weight: bold;
  line-height: 1.2;
}

.page-about__paragraph {
  font-size: 1.1em;
  line-height: 1.7;
  margin-bottom: 20px;
  color: var(--page-about-text-secondary);
  text-align: justify;
}

.page-about__hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 10px; /* Small top padding */
  padding-bottom: 60px;
  overflow: hidden;
  min-height: 600px;
}

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

.page-about__hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.4); /* Darken image for text readability */
  display: block;
}

.page-about__hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  padding: 20px;
  background: rgba(0, 0, 0, 0.4); /* Semi-transparent background for text */
  border-radius: 10px;
}

.page-about__main-title {
  font-size: clamp(2.5em, 5vw, 3.5em); /* Responsive font size for H1 */
  color: var(--page-about-gold-color);
  margin-bottom: 20px;
  font-weight: bold;
  line-height: 1.2;
}

.page-about__intro-text {
  font-size: 1.2em;
  color: var(--page-about-text-main);
  margin-bottom: 30px;
}

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

.page-about__btn-primary,
.page-about__btn-secondary {
  display: inline-block;
  padding: 15px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  box-sizing: border-box;
  max-width: 100%;
  white-space: normal;
  word-wrap: break-word;
  text-align: center;
}

.page-about__btn-primary {
  background: var(--page-about-btn-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-about__btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.page-about__btn-secondary {
  background: transparent;
  color: var(--page-about-gold-color);
  border: 2px solid var(--page-about-gold-color);
}

.page-about__btn-secondary:hover {
  background: var(--page-about-gold-color);
  color: var(--page-about-bg-color);
}

.page-about__general-introduction .page-about__container {
  padding-top: 40px;
  padding-bottom: 40px;
}

.page-about__dark-section {
  background-color: var(--page-about-card-bg);
  color: var(--page-about-text-main);
}

.page-about__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-about__card {
  background-color: var(--page-about-card-bg);
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--page-about-text-main);
}

.page-about__card-title {
  font-size: 1.8em;
  color: var(--page-about-gold-color);
  margin-bottom: 15px;
  font-weight: bold;
}

.page-about__card-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-top: 20px;
  object-fit: cover;
  min-height: 200px;
  max-width: 100%;
  display: block;
}

.page-about__values-list {
  list-style: none;
  padding: 0;
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.page-about__value-item {
  background-color: var(--page-about-card-bg);
  border-radius: 10px;
  padding: 25px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
  text-align: center;
  border: 1px solid var(--page-about-border-color);
  color: var(--page-about-text-main);
}

.page-about__value-title {
  font-size: 1.5em;
  color: var(--page-about-gold-color);
  margin-bottom: 10px;
  font-weight: bold;
}

.page-about__content-image {
  width: 100%;
  height: auto;
  border-radius: 10px;
  margin-top: 50px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  object-fit: cover;
  min-height: 200px;
  max-width: 100%;
  display: block;
}

.page-about__timeline {
  position: relative;
  max-width: 800px;
  margin: 60px auto;
  padding: 20px 0;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  width: 4px;
  background-color: var(--page-about-border-color);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -2px;
}

.page-about__timeline-item {
  padding: 10px 40px;
  position: relative;
  background-color: inherit;
  width: 50%;
  box-sizing: border-box;
}

.page-about__timeline-item::after {
  content: '';
  position: absolute;
  width: 25px;
  height: 25px;
  right: -17px;
  background-color: var(--page-about-gold-color);
  border: 4px solid var(--page-about-deep-green);
  top: 15px;
  border-radius: 50%;
  z-index: 1;
}

.page-about__timeline-item:nth-child(odd) {
  left: 0;
}

.page-about__timeline-item:nth-child(even) {
  left: 50%;
}

.page-about__timeline-item:nth-child(even)::after {
  left: -16px;
}

.page-about__timeline-year {
  font-size: 1.6em;
  color: var(--page-about-gold-color);
  font-weight: bold;
  margin-bottom: 5px;
}

.page-about__timeline-item .page-about__paragraph {
  font-size: 1em;
  color: var(--page-about-text-secondary);
  text-align: left;
}

.page-about__commitment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-about__commitment-item {
  background-color: #11271B; /* Custom light background for contrast */
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
  text-align: center;
  border: 1px solid var(--page-about-border-color);
  color: var(--page-about-text-main);
}

.page-about__commitment-title {
  font-size: 1.8em;
  color: var(--page-about-gold-color);
  margin-bottom: 15px;
  font-weight: bold;
}

.page-about__tech-list {
  list-style: none;
  padding: 0;
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.page-about__tech-item {
  background-color: var(--page-about-bg-color);
  border-radius: 10px;
  padding: 25px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
  text-align: center;
  border: 1px solid var(--page-about-border-color);
  color: var(--page-about-text-main);
}

.page-about__tech-title {
  font-size: 1.5em;
  color: var(--page-about-gold-color);
  margin-bottom: 10px;
  font-weight: bold;
}

.page-about__faq-list {
  margin-top: 40px;
}

.page-about__faq-item {
  background-color: var(--page-about-card-bg);
  border: 1px solid var(--page-about-border-color);
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
  color: var(--page-about-text-main);
}

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  cursor: pointer;
  font-size: 1.2em;
  font-weight: bold;
  color: var(--page-about-gold-color);
  background-color: var(--page-about-deep-green);
  user-select: none;
}

.page-about__faq-qtext {
  flex-grow: 1;
  pointer-events: none; /* Prevent text selection from interfering with click */
}

.page-about__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  pointer-events: none; /* Prevent toggle from interfering with click */
}

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

.page-about__faq-answer {
  padding: 0 25px 15px;
  font-size: 1.05em;
  color: var(--page-about-text-secondary);
  line-height: 1.6;
}

.page-about__faq-answer .page-about__paragraph {
  margin-bottom: 0;
}

/* Styling for details tag, ensuring summary behaves correctly */
.page-about__faq-item summary {
  list-style: none;
}

.page-about__faq-item summary::-webkit-details-marker {
  display: none;
}

.page-about__cta-bottom {
  text-align: center;
  padding: 80px 0;
  background-color: var(--page-about-deep-green);
}

.page-about__cta-bottom .page-about__section-title {
  color: var(--page-about-gold-color);
  margin-bottom: 25px;
}

.page-about__cta-bottom .page-about__paragraph {
  max-width: 800px;
  margin: 0 auto 30px;
  color: var(--page-about-text-main);
}

/* --- Responsive Styles --- */
@media (max-width: 1024px) {
  .page-about__hero-content {
    max-width: 700px;
  }
  .page-about__section-title {
    font-size: 2.2em;
  }
  .page-about__paragraph {
    font-size: 1em;
  }
}

@media (max-width: 768px) {
  .page-about__section {
    padding: 40px 0;
  }
  .page-about__main-title {
    font-size: clamp(2em, 8vw, 2.8em);
  }
  .page-about__intro-text {
    font-size: 1em;
  }
  .page-about__cta-buttons {
    flex-direction: column;
    gap: 15px;
  }
  .page-about__btn-primary,
  .page-about__btn-secondary {
    width: 100%;
    padding: 12px 20px;
  }
  .page-about__timeline::before {
    left: 18px;
  }
  .page-about__timeline-item {
    width: 100%;
    padding-left: 50px;
    padding-right: 15px;
  }
  .page-about__timeline-item::after {
    left: 10px;
  }
  .page-about__timeline-item:nth-child(even) {
    left: 0;
  }
  .page-about__timeline-item:nth-child(even)::after {
    left: 10px;
  }
  .page-about__faq-question {
    font-size: 1.1em;
    padding: 15px 20px;
  }
  .page-about__faq-answer {
    padding: 0 20px 10px;
  }
  .page-about__container,
  .page-about__section,
  .page-about__card,
  .page-about__value-item,
  .page-about__commitment-item,
  .page-about__tech-item,
  .page-about__hero-section,
  .page-about__faq-item,
  .page-about__cta-bottom {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important;
  }
  .page-about__hero-section {
    padding-left: 0;
    padding-right: 0;
  }

  /* Mobile specific image responsiveness */
  .page-about img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  .page-about__hero-section {
    padding-top: 10px !important; /* body đã xử lý --header-offset */
  }
}

@media (max-width: 480px) {
  .page-about__section-title {
    font-size: 1.8em;
  }
  .page-about__main-title {
    font-size: clamp(1.8em, 10vw, 2.5em);
  }
  .page-about__hero-content {
    padding: 15px;
  }
  .page-about__card,
  .page-about__value-item,
  .page-about__commitment-item,
  .page-about__tech-item {
    padding: 20px;
  }
}