.page-about {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-main); /* #F2FFF6 */
  background-color: var(--background); /* #08160F */
}

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

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

.page-about__section-title {
  font-size: 2.8em;
  font-weight: bold;
  margin-bottom: 20px;
  color: var(--text-main); /* #F2FFF6 */
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about__section-description {
  font-size: 1.1em;
  margin-bottom: 40px;
  color: var(--text-secondary); /* #A7D9B8 */
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px 0 60px 0; /* body already handles header offset */
  overflow: hidden;
}

.page-about__hero-image-wrapper {
  width: 100%;
  max-height: 700px;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 40px;
}

.page-about__hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: 12px;
}

.page-about__hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: 0 20px;
}

.page-about__main-title {
  font-weight: bold;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-main); /* #F2FFF6 */
  margin-bottom: 20px;
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  font-size: clamp(2.2em, 4vw, 3.5em);
}

.page-about__hero-description {
  font-size: 1.2em;
  color: var(--text-secondary); /* #A7D9B8 */
  margin-bottom: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  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;
  font-size: 1.1em;
  transition: all 0.3s ease;
  box-sizing: border-box;
  max-width: 100%;
  white-space: normal;
  word-wrap: break-word;
}

.page-about__btn-primary {
  background: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  color: #ffffff;
  border: 2px solid transparent;
}

.page-about__btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(42, 209, 111, 0.4);
}

.page-about__btn-secondary {
  background: transparent;
  color: var(--text-main); /* #F2FFF6 */
  border: 2px solid var(--border-color); /* #2E7A4E */
}

.page-about__btn-secondary:hover {
  background: var(--deep-green); /* #0A4B2C */
  color: var(--glow); /* #57E38D */
  border-color: var(--glow); /* #57E38D */
  transform: translateY(-3px);
}

.page-about__content-grid {
  display: flex;
  align-items: center;
  gap: 40px;
  margin-bottom: 60px;
  text-align: left;
}

.page-about__content-grid--reverse {
  flex-direction: row-reverse;
}

.page-about__text-block {
  flex: 1;
}

.page-about__subtitle {
  font-size: 2em;
  color: var(--text-main); /* #F2FFF6 */
  margin-bottom: 15px;
}

.page-about__text-block p {
  color: var(--text-secondary); /* #A7D9B8 */
  margin-bottom: 15px;
  font-size: 1.05em;
}

.page-about__image-wrapper {
  flex: 1;
  min-width: 200px;
}

.page-about__image-wrapper--full {
  margin-top: 40px;
  flex: none;
  width: 100%;
}

.page-about__image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  object-fit: cover;
}

.page-about__history-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  text-align: left;
  position: relative;
  padding-top: 20px;
}

.page-about__history-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--divider); /* #1E3A2A */
  transform: translateX(-50%);
}

.page-about__timeline-item {
  position: relative;
  padding: 20px;
  background-color: var(--card-bg); /* #11271B */
  border-radius: 10px;
  border: 1px solid var(--border-color); /* #2E7A4E */
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-about__timeline-item::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  width: 16px;
  height: 16px;
  background-color: var(--main-color); /* #11A84E */
  border-radius: 50%;
  border: 2px solid var(--glow); /* #57E38D */
  transform: translate(-50%, -50%);
  z-index: 1;
}

.page-about__timeline-year {
  font-size: 1.8em;
  color: var(--gold); /* #F2C14E */
  margin-bottom: 10px;
}

.page-about__timeline-item p {
  color: var(--text-secondary); /* #A7D9B8 */
}

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

.page-about__value-card {
  background-color: var(--card-bg); /* #11271B */
  border: 1px solid var(--border-color); /* #2E7A4E */
  border-radius: 10px;
  padding: 30px;
  text-align: left;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-about__value-title {
  font-size: 1.6em;
  color: var(--text-main); /* #F2FFF6 */
  margin-bottom: 15px;
}

.page-about__value-card p {
  color: var(--text-secondary); /* #A7D9B8 */
  font-size: 1em;
}

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

.page-about__feature-card {
  background-color: var(--card-bg); /* #11271B */
  border: 1px solid var(--border-color); /* #2E7A4E */
  border-radius: 10px;
  padding: 30px;
  text-align: left;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
}

.page-about__feature-title {
  font-size: 1.6em;
  color: var(--text-main); /* #F2FFF6 */
  margin-bottom: 15px;
}

.page-about__feature-card p {
  color: var(--text-secondary); /* #A7D9B8 */
  font-size: 1em;
  flex-grow: 1;
  margin-bottom: 20px;
}

.page-about__link-more {
  color: var(--glow); /* #57E38D */
  text-decoration: none;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  transition: color 0.3s ease;
}

.page-about__link-more:hover {
  color: var(--gold); /* #F2C14E */
}

.page-about__arrow {
  margin-left: 8px;
  font-size: 1.2em;
  transition: transform 0.3s ease;
}

.page-about__link-more:hover .page-about__arrow {
  transform: translateX(5px);
}

.page-about__team-description {
  max-width: 900px;
  margin: 0 auto 40px auto;
  text-align: left;
}

.page-about__team-description p {
  color: var(--text-secondary); /* #A7D9B8 */
  font-size: 1.05em;
  margin-bottom: 15px;
}

.page-about__faq-section {
  background-color: var(--deep-green); /* #0A4B2C */
  padding: 80px 0;
}

.page-about__faq-list {
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}

.page-about__faq-item {
  background-color: var(--card-bg); /* #11271B */
  border: 1px solid var(--border-color); /* #2E7A4E */
  border-radius: 10px;
  margin-bottom: 15px;
  overflow: hidden;
}

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 25px;
  font-size: 1.2em;
  font-weight: bold;
  color: var(--text-main); /* #F2FFF6 */
  cursor: pointer;
  background-color: var(--card-bg); /* #11271B */
  transition: background-color 0.3s ease;
  list-style: none; /* For details/summary */
}

.page-about__faq-question::-webkit-details-marker {
  display: none; /* For details/summary */
}

.page-about__faq-item[open] > .page-about__faq-question {
  background-color: var(--deep-green); /* #0A4B2C */
}

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

.page-about__faq-toggle {
  font-size: 1.5em;
  margin-left: 15px;
  color: var(--glow); /* #57E38D */
}

.page-about__faq-answer {
  padding: 0 25px 20px 25px;
  font-size: 1em;
  color: var(--text-secondary); /* #A7D9B8 */
  line-height: 1.6;
}

.page-about__faq-answer p {
  margin-bottom: 10px;
}

.page-about__future .page-about__cta-buttons {
  margin-top: 40px;
}

/* Image and Video responsiveness */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about video {
  max-width: 100%;
  width: 100%;
  height: auto;
  display: block;
}

.page-about__image-wrapper,
.page-about__video-container,
.page-about__video-wrapper {
  width: 100%;
  max-width: 100%;\  box-sizing: border-box;
  overflow: hidden;
}

/* Responsive adjustments */
@media (min-width: 769px) {
  .page-about__history-timeline::before {
    left: 50%;
  }

  .page-about__timeline-item {
    width: calc(50% - 20px);
  }

  .page-about__timeline-item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about__timeline-item:nth-child(even) {
    margin-left: auto;
    text-align: left;
  }

  .page-about__timeline-item:nth-child(odd)::before {
    left: auto;
    right: -28px;
  }

  .page-about__timeline-item:nth-child(even)::before {
    left: -28px;
    right: auto;
  }
}

@media (max-width: 1024px) {
  .page-about__main-title {
    font-size: clamp(2em, 5vw, 3em);
  }

  .page-about__section-title {
    font-size: 2.2em;
  }

  .page-about__subtitle {
    font-size: 1.8em;
  }

  .page-about__feature-title,
  .page-about__value-title {
    font-size: 1.4em;
  }
}

@media (max-width: 768px) {
  .page-about__section {
    padding: 40px 0;
  }

  .page-about__hero-section {
    padding: 10px 0 40px 0;
  }

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

  .page-about__main-title {
    font-size: clamp(1.8em, 6vw, 2.5em);
    margin-bottom: 15px;
  }

  .page-about__hero-description {
    font-size: 1em;
    margin-bottom: 30px;
  }

  .page-about__cta-buttons {
    flex-direction: column;
    gap: 10px;
    padding: 0 15px;
  }

  .page-about__btn-primary,
  .page-about__btn-secondary {
    width: 100% !important;
    max-width: 100% !important;
    padding: 12px 20px;
    font-size: 1em;
    white-space: normal !important;
    word-wrap: break-word !important;
  }

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

  .page-about__section-description {
    font-size: 0.95em;
    margin-bottom: 30px;
    padding: 0 15px;
  }

  .page-about__content-grid {
    flex-direction: column;
    gap: 30px;
    margin-bottom: 40px;
    padding: 0 15px;
  }

  .page-about__content-grid--reverse {
    flex-direction: column;
  }

  .page-about__subtitle {
    font-size: 1.5em;
  }

  .page-about__text-block p {
    font-size: 0.95em;
  }

  .page-about__image-wrapper--full {
    padding: 0 15px;
  }

  .page-about__history-timeline {
    padding: 0 15px;
  }

  .page-about__history-timeline::before {
    left: 15px;
    transform: translateX(0);
  }

  .page-about__timeline-item {
    width: 100%;
    padding-left: 40px;
    text-align: left;
  }

  .page-about__timeline-item::before {
    left: 15px;
    transform: translateX(-50%);
  }

  .page-about__timeline-year {
    font-size: 1.4em;
  }

  .page-about__values-grid,
  .page-about__features-grid {
    gap: 20px;
    padding: 0 15px;
  }

  .page-about__value-card,
  .page-about__feature-card {
    padding: 20px;
  }

  .page-about__value-title,
  .page-about__feature-title {
    font-size: 1.3em;
  }

  .page-about__team-description {
    padding: 0 15px;
  }

  .page-about__faq-section {
    padding: 50px 0;
  }

  .page-about__faq-list {
    padding: 0 15px;
  }

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

  .page-about__faq-answer {
    padding: 0 20px 15px 20px;
    font-size: 0.95em;
  }

  /* Mobile responsive image styles */
  .page-about img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  .page-about__section,
  .page-about__card,
  .page-about__container,
  .page-about__image-wrapper,
  .page-about__hero-image-wrapper,
  .page-about__video-section,
  .page-about__video-container,
  .page-about__video-wrapper,
  .page-about__cta-buttons,
  .page-about__button-group,
  .page-about__btn-container {
    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-top: 10px !important; /* body đã xử lý --header-offset */
  }

  .page-about video,
  .page-about__video {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }

  .page-about__video-section {
    padding-top: 10px !important;
  }

  .page-about__cta-buttons {
    flex-direction: column;
    gap: 10px;
    flex-wrap: wrap !important;
  }
}

@media (max-width: 480px) {
  .page-about__section-title {
    font-size: 1.6em;
  }

  .page-about__subtitle {
    font-size: 1.3em;
  }

  .page-about__timeline-year {
    font-size: 1.2em;
  }

  .page-about__value-title,
  .page-about__feature-title {
    font-size: 1.2em;
  }

  .page-about__faq-question {
    font-size: 1em;
    padding: 12px 15px;
  }

  .page-about__faq-answer {
    padding: 0 15px 12px 15px;
  }
}