.page-about {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: #F2FFF6; /* Text Main */
  background-color: #08160F; /* Background */
}

.page-about__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
  box-sizing: border-box;
  overflow: hidden;
}

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

.page-about__hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.5); /* Giảm độ sáng để chữ dễ đọc */
}

.page-about__hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  color: #F2FFF6;
  padding: 20px;
  box-sizing: border-box;
}

.page-about__main-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
  color: #F2FFF6;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.page-about__hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  margin-bottom: 30px;
  color: #A7D9B8; /* 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: 700;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
  text-align: center;
}

.page-about__btn-primary {
  background: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  color: #F2FFF6;
  border: 2px solid transparent;
}

.page-about__btn-primary:hover {
  background: linear-gradient(180deg, #13994A 0%, #2AD16F 100%);
  box-shadow: 0 0 15px #57E38D;
}

.page-about__btn-secondary {
  background-color: transparent;
  color: #F2FFF6;
  border: 2px solid #2E7A4E; /* Border */
}

.page-about__btn-secondary:hover {
  background-color: rgba(46, 122, 78, 0.2);
  box-shadow: 0 0 15px #57E38D;
}

.page-about__btn--large {
  padding: 18px 35px;
  font-size: 1.2rem;
}

.page-about__section {
  padding: 80px 20px;
  box-sizing: border-box;
  background-color: #08160F; /* Background */
  color: #F2FFF6; /* Text Main */
}

.page-about__section--dark {
  background-color: #11271B; /* Card BG */
}

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

.page-about__section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 50px;
  color: #F2FFF6;
  position: relative;
}

.page-about__section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, #2AD16F, #13994A);
  margin: 15px auto 0;
  border-radius: 2px;
}

.page-about__content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
  align-items: center;
}

.page-about__content-grid--reverse {
  flex-direction: column-reverse; /* Default for mobile */
}

.page-about__text-block {
  font-size: 1.05rem;
}

.page-about__sub-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  margin-top: 30px;
  margin-bottom: 15px;
  color: #2AD16F;
}

.page-about__text-block p {
  margin-bottom: 15px;
  color: #A7D9B8; /* Text Secondary */
}

.page-about__image-block {
  text-align: center;
}

.page-about__image {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  border: 1px solid #2E7A4E;
}

.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: #08160F; /* Background */
  border-radius: 12px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  border: 1px solid #1E3A2A; /* Divider */
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  color: #F2FFF6;
}

.page-about__feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), 0 0 20px #57E38D;
}

.page-about__feature-icon {
  width: 100%;
  height: auto;
  max-width: 200px; /* Adjust max-width for better visual */
  margin-bottom: 20px;
  border-radius: 8px;
}

.page-about__feature-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: #2AD16F;
}

.page-about__feature-description {
  font-size: 0.95rem;
  color: #A7D9B8; /* Text Secondary */
}

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

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

.page-about__faq-section {
  padding: 80px 20px;
  background-color: #08160F; /* Background */
  color: #F2FFF6;
  box-sizing: border-box;
}

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

.page-about__faq-item {
  background-color: #11271B; /* Card BG */
  border: 1px solid #1E3A2A; /* Divider */
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
  color: #F2FFF6;
}

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 25px;
  font-size: 1.15rem;
  font-weight: 600;
  cursor: pointer;
  background-color: #11271B; /* Card BG */
  color: #F2FFF6;
  transition: background-color 0.3s ease;
  list-style: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

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

.page-about__faq-question:hover {
  background-color: #0A4B2C;
}

.page-about__faq-toggle {
  font-size: 1.8rem;
  line-height: 1;
  transition: transform 0.3s ease;
  color: #2AD16F;
}

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

.page-about__faq-answer {
  padding: 0 25px 20px;
  font-size: 1rem;
  color: #A7D9B8; /* Text Secondary */
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.page-about__faq-item[open] .page-about__faq-answer {
  max-height: 500px; /* Sufficient height for content */
  transition: max-height 0.5s ease-in;
}

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

.page-about__faq-answer a {
  color: #2AD16F;
  text-decoration: none;
}

.page-about__faq-answer a:hover {
  text-decoration: underline;
}

.page-about__conclusion-section {
  padding: 80px 20px;
  text-align: center;
  background-color: #11271B; /* Card BG */
  color: #F2FFF6;
}

.page-about__conclusion-text {
  font-size: 1.15rem;
  max-width: 800px;
  margin: 0 auto 40px;
  color: #A7D9B8;
}

/* Responsive adjustments */
@media (min-width: 769px) {
  .page-about__content-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__content-grid--reverse {
    grid-template-areas: "image text";
  }

  .page-about__content-grid--reverse .page-about__text-block {
    grid-area: text;
  }

  .page-about__content-grid--reverse .page-about__image-block {
    grid-area: image;
  }

  .page-about__hero-content {
    padding: 100px 20px;
  }
}

@media (max-width: 768px) {
  .page-about__hero-section {
    padding: 40px 15px;
  }

  .page-about__main-title {
    font-size: 2rem;
  }

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

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

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

  .page-about__section {
    padding: 50px 15px;
  }

  .page-about__section-title {
    font-size: 1.8rem;
    margin-bottom: 30px;
  }

  .page-about__sub-title {
    font-size: 1.3rem;
  }

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

  .page-about__image {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  .page-about__image-block {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 0px;
    padding-right: 0px;
    overflow: hidden !important;
  }

  .page-about__feature-card {
    padding: 25px;
  }

  .page-about__feature-title {
    font-size: 1.2rem;
  }

  .page-about__feature-description {
    font-size: 0.9rem;
  }

  .page-about__faq-section {
    padding: 50px 15px;
  }

  .page-about__faq-question {
    font-size: 1rem;
    padding: 15px 20px;
  }

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

  .page-about__conclusion-section {
    padding: 50px 15px;
  }

  .page-about__conclusion-text {
    font-size: 1rem;
  }

  .page-about__cta-buttons--center {
    flex-direction: column;
    gap: 15px;
  }

  .page-about__hero-image-wrapper,
  .page-about__hero-image {
    filter: brightness(0.4); /* Tăng độ tối cho mobile để chữ rõ hơn */
  }

  .page-about img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
  }

  .page-about__section,
  .page-about__card,
  .page-about__container,
  .page-about__hero-section,
  .page-about__faq-section,
  .page-about__conclusion-section {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-about__video-section {
    padding-top: 10px !important; /* body đã đảm nhận --header-offset */
  }

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

  .page-about__feature-icon {
    max-width: 150px;
  }
}