.page-about {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--text-main); /* Sử dụng màu chữ chính đã định nghĩa */
  background-color: var(--background); /* Sử dụng màu nền đã định nghĩa */
}

.page-about__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 10px; /* Nhỏ hơn so với --header-offset */
  padding-bottom: 60px;
  overflow: hidden;
}

.page-about__hero-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  max-height: 700px;
}

.page-about__hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  padding: 20px;
  background: rgba(8, 22, 15, 0.7);
  border-radius: 10px;
  margin-top: 100px;
}

.page-about__main-title {
  font-weight: bold;
  color: var(--text-main);
  margin-bottom: 15px;
  line-height: 1.2;
  letter-spacing: 0.05em;
  max-width: 90%;
  margin-left: auto;
  margin-right: auto;
}

.page-about__hero-description {
  font-size: 1.1em;
  color: var(--text-secondary);
  margin-bottom: 30px;
  max-width: 80%;
  margin-left: auto;
  margin-right: auto;
}

.page-about__cta-button {
  display: inline-block;
  padding: 12px 30px;
  background: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  color: #ffffff;
  text-decoration: none;
  border-radius: 5px;
  font-weight: bold;
  transition: background 0.3s ease, transform 0.2s ease;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-about__cta-button:hover {
  background: linear-gradient(180deg, #13994A 0%, #2AD16F 100%);
  transform: translateY(-2px);
}

.page-about__cta-button--center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

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

.page-about__section--intro {
  background-color: var(--background);
}

.page-about__section--history, .page-about__section--team, .page-about__section--future {
  background-color: var(--card-bg);
}

.page-about__section--values, .page-about__section--ecosystem, .page-about__section--tech, .page-about__section--promotions, .page-about__section--faq {
  background-color: var(--background);
}

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

.page-about__heading {
  font-size: 2.5em;
  color: var(--text-main);
  text-align: center;
  margin-bottom: 40px;
  font-weight: bold;
}

.page-about__paragraph {
  font-size: 1.1em;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.8;
  text-align: justify;
}

.page-about__image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  margin-bottom: 30px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.page-about__image--left {
  float: left;
  margin-right: 30px;
  max-width: 45%;
}

.page-about__image--right {
  float: right;
  margin-left: 30px;
  max-width: 45%;
}

.page-about__section--history .page-about__container::after,
.page-about__section--team .page-about__container::after,
.page-about__section--future .page-about__container::after {
  content: "";
  display: table;
  clear: both;
}

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

.page-about__card {
  background-color: var(--card-bg);
  color: var(--text-main);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  transition: transform 0.3s ease;
}

.page-about__card:hover {
  transform: translateY(-5px);
}

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

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

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

.page-about__list {
  list-style: none;
  padding: 0;
  margin-bottom: 30px;
}

.page-about__list-item {
  font-size: 1.1em;
  color: var(--text-secondary);
  margin-bottom: 15px;
  padding-left: 30px;
  position: relative;
}

.page-about__list-item::before {
  content: '✔';
  color: var(--main-color);
  font-weight: bold;
  position: absolute;
  left: 0;
  top: 0;
}

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

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

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  font-size: 1.2em;
  font-weight: bold;
  color: var(--text-main);
  cursor: pointer;
  background-color: var(--deep-green);
  border-bottom: 1px solid var(--divider);
  transition: background-color 0.3s ease;
  list-style: none; /* For details/summary */
}

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

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

.page-about__faq-toggle {
  font-size: 1.5em;
  color: var(--text-main);
  margin-left: 15px;
}

.page-about__faq-answer {
  padding: 20px;
  font-size: 1em;
  color: var(--text-secondary);
  line-height: 1.7;
  background-color: var(--card-bg);
  border-top: 1px solid var(--divider);
}

.page-about__faq-item[open] .page-about__faq-question {
  background-color: var(--main-color);
  border-bottom: 1px solid var(--main-color);
}

.page-about__faq-item:not([open]) .page-about__faq-answer {
  display: none;
}

/* Media Queries for Responsiveness */
@media (max-width: 1024px) {
  .page-about__hero-content {
    margin-top: 50px;
  }

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

  .page-about__heading {
    font-size: 2em;
  }

  .page-about__image--left, .page-about__image--right {
    float: none;
    margin: 0 auto 30px auto;
    max-width: 80%;
  }

  .page-about__section--history .page-about__container::after,
  .page-about__section--team .page-about__container::after,
  .page-about__section--future .page-about__container::after {
    clear: none;
  }
}

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

  .page-about__hero-image {
    max-height: 500px;
  }

  .page-about__hero-content {
    margin-top: 30px;
    padding: 15px;
  }

  .page-about__main-title {
    font-size: clamp(1.8em, 5vw, 2.5em);
  }

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

  .page-about__cta-button {
    padding: 10px 20px;
    font-size: 0.95em;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
  }

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

  .page-about__heading {
    font-size: 1.8em;
    margin-bottom: 30px;
  }

  .page-about__paragraph, .page-about__list-item, .page-about__card-text {
    font-size: 0.95em;
  }

  .page-about__card-title {
    font-size: 1.3em;
  }

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

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

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

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

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

  .page-about__image--left, .page-about__image--right {
    max-width: 100%;
    margin-right: 0;
    margin-left: 0;
  }

  .page-about__cta-button-group {
    flex-direction: column;
    gap: 10px;
  }

  .page-about__cta-buttons {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    flex-wrap: wrap !important;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  .page-about__main-title {
    font-size: clamp(1.5em, 6vw, 2em);
  }

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

  .page-about__card-title {
    font-size: 1.2em;
  }

  .page-about__faq-question {
    font-size: 1em;
  }
}