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

.page-about__hero-section {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px 0 60px 0; /* body handles padding-top, use small top padding here */
  text-align: center;
  overflow: hidden;
  background: linear-gradient(180deg, #08160F 0%, #11271B 100%); /* Using custom background color */
}

.page-about__hero-image-wrapper {
  width: 100%;
  max-height: 600px; /* Limit image height */
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.page-about__hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  filter: brightness(0.7); /* Slightly darken image for better text readability */
}

.page-about__hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin-top: 40px; /* Spacing between image and text */
  padding: 0 20px;
  color: var(--text-main);
}

.page-about__main-title {
  font-size: clamp(2em, 5vw, 3.5em);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 15px;
  color: var(--gold); /* Using gold for main title */
  text-shadow: 0 0 10px rgba(242, 193, 78, 0.5);
}

.page-about__intro-text {
  font-size: 1.1em;
  margin-bottom: 30px;
  color: var(--text-secondary);
}

.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;
  white-space: normal;
  word-wrap: break-word;
  box-sizing: border-box;
}

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

.page-about__btn-primary:hover {
  background: linear-gradient(180deg, #13994A 0%, #2AD16F 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(42, 209, 111, 0.4);
}

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

.page-about__btn-secondary:hover {
  background: var(--glow);
  color: var(--background);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(87, 227, 141, 0.4);
}

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

.page-about__section--mission,
.page-about__section--tech,
.page-about__section--future {
  background-color: var(--background);
  color: var(--text-main);
}

.page-about__section--team,
.page-about__section--csr,
.page-about__section--faq {
  background-color: var(--card-b-g);
  color: var(--text-main);
}

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

.page-about__section-title {
  font-size: 2.5em;
  font-weight: 700;
  margin-bottom: 30px;
  text-align: center;
  color: var(--main-color);
  position: relative;
  padding-bottom: 15px;
}

.page-about__section-title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background-color: var(--gold);
  border-radius: 2px;
}

.page-about__subsection-title {
  font-size: 1.8em;
  font-weight: 600;
  margin-top: 40px;
  margin-bottom: 15px;
  color: var(--glow);
}

.page-about__paragraph {
  font-size: 1.05em;
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.page-about__list {
  list-style: none;
  padding: 0;
  margin-bottom: 20px;
}

.page-about__list-item {
  position: relative;
  padding-left: 30px;
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.page-about__list-item::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--glow);
  font-weight: bold;
  font-size: 1.2em;
  top: 0;
}

.page-about__image-content {
  width: 100%;
  height: auto;
  display: block;
  margin: 30px auto;
  border-radius: 12px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  object-fit: cover;
}

/* FAQ Section */
.page-about__faq-list {
  margin-top: 40px;
}

.page-about__faq-item {
  background-color: var(--deep-green);
  border: 1px solid var(--divider);
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
}

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 25px;
  cursor: pointer;
  font-weight: bold;
  font-size: 1.15em;
  color: var(--text-main);
  background-color: var(--deep-green);
  transition: background-color 0.3s ease;
  list-style: none;
}

.page-about__faq-item[open] > .page-about__faq-question {
  background-color: var(--main-color);
  color: #ffffff;
}

.page-about__faq-question:hover {
  background-color: var(--main-color);
  color: #ffffff;
}

.page-about__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  transition: transform 0.3s ease;
  color: var(--glow);
}

.page-about__faq-item[open] .page-about__faq-toggle {
  transform: rotate(45deg);
  color: #ffffff;
}

.page-about__faq-answer {
  padding: 15px 25px 20px;
  font-size: 1em;
  color: var(--text-secondary);
  background-color: var(--card-b-g);
}

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

/* Text Colors */
.page-about__text-main {
  color: var(--text-main);
}

.page-about__text-secondary {
  color: var(--text-secondary);
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .page-about__main-title {
    font-size: clamp(2em, 6vw, 3em);
  }

  .page-about__section-title {
    font-size: 2em;
  }

  .page-about__subsection-title {
    font-size: 1.5em;
  }
}

@media (max-width: 768px) {
  .page-about__hero-section {
    padding: 10px 0 40px 0;
  }

  .page-about__hero-content {
    margin-top: 20px;
    padding: 0 15px;
  }

  .page-about__main-title {
    font-size: clamp(1.8em, 7vw, 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% !important;
    max-width: 100% !important;
    padding: 12px 20px;
  }

  .page-about__section {
    padding: 40px 0;
  }

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

  .page-about__section-title {
    font-size: 1.8em;
    margin-bottom: 25px;
  }

  .page-about__subsection-title {
    font-size: 1.3em;
    margin-top: 30px;
  }

  .page-about__paragraph,
  .page-about__list-item,
  .page-about__faq-answer {
    font-size: 0.95em;
  }

  .page-about__faq-question {
    font-size: 1.05em;
    padding: 15px 20px;
  }

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

  .page-about__section,
  .page-about__container {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px !important;
    padding-right: 15px !important;
    overflow-x: hidden;
  }

  .page-about__hero-section {
    padding-top: 10px !important; /* body đã xử lý --header-offset */
  }

  .page-about__cta-buttons {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 0;
    padding-right: 0;
  }
}

/* Color variables */
:root {
  --main-color: #11A84E;
  --accent-color: #22C768;
  --button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  --card-b-g: #11271B;
  --background: #08160F;
  --text-main: #F2FFF6;
  --text-secondary: #A7D9B8;
  --border-color: #2E7A4E;
  --glow: #57E38D;
  --gold: #F2C14E;
  --divider: #1E3A2A;
  --deep-green: #0A4B2C;
}