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

/* body 已 padding-top: var(--header-offset)；页面禁止再写该变量 */
.page-about {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text-main); /* Light text for dark body background */
  background-color: var(--color-bg);
}

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

.page-about__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 20px;
  padding-top: 10px; /* Small top padding, body handles header offset */
  text-align: center;
  overflow: hidden;
}

.page-about__hero-image-wrapper {
  width: 100%;
  max-width: 100%;
  margin-bottom: 30px;
  box-sizing: border-box;
}

.page-about__hero-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  object-fit: cover;
}

.page-about__hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative; /* Ensure content is above any potential background */
  z-index: 2;
}

.page-about__hero-title {
  font-size: clamp(2em, 4vw, 3.5em); /* Responsive font size */
  color: var(--color-text-main);
  margin-bottom: 20px;
  font-weight: bold;
  line-height: 1.2;
}

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

.page-about__hero-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;
  font-size: 1.1em;
  transition: all 0.3s ease;
  max-width: 100%;
  box-sizing: border-box;
  white-space: normal;
  word-wrap: break-word;
}

.page-about__btn-primary {
  background: var(--color-button-gradient);
  color: #ffffff; /* Button text always white */
  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(--color-main);
  border: 2px solid var(--color-main);
}

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

.page-about__section-title {
  font-size: clamp(1.8em, 3.5vw, 2.8em); /* Responsive font size */
  color: var(--color-text-main);
  text-align: center;
  margin-bottom: 40px;
  font-weight: bold;
  line-height: 1.3;
}

.page-about__sub-title {
  font-size: clamp(1.4em, 2.5vw, 2em); /* Responsive font size */
  color: var(--color-text-main);
  margin-bottom: 20px;
  font-weight: bold;
}

.page-about__text-block {
  font-size: 1em;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  text-align: justify;
}

.page-about__highlight {
  color: var(--color-main);
  font-weight: bold;
}

.page-about a {
  color: var(--color-main);
  text-decoration: none;
  transition: color 0.3s ease;
}

.page-about a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

.page-about__intro-section,
.page-about__mission-vision-section,
.page-about__history-section,
.page-about__values-section,
.page-about__experience-section,
.page-about__security-section,
.page-about__csr-section,
.page-about__team-section,
.page-about__future-section,
.page-about__faq-section,
.page-about__cta-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--color-divider);
}

.page-about__intro-section:last-of-type, /* Adjust for last section */
.page-about__cta-section:last-of-type {
  border-bottom: none;
}

.page-about__image-full-width {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  margin: 40px 0;
  object-fit: cover;
}

.page-about__content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 40px;
}

.page-about__content-item {
  background-color: var(--color-card-bg);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
}

.page-about__milestone-list,
.page-about__feature-list,
.page-about__security-list {
  list-style: none;
  padding: 0;
  margin-top: 30px;
}

.page-about__milestone-item,
.page-about__feature-item,
.page-about__security-item {
  background-color: var(--color-card-bg);
  padding: 20px;
  margin-bottom: 15px;
  border-radius: 8px;
  border-left: 5px solid var(--color-main);
  color: var(--color-text-secondary);
  font-size: 1.05em;
}

.page-about__milestone-item strong,
.page-about__feature-item strong,
.page-about__security-item strong {
  color: var(--color-text-main);
}

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

.page-about__value-card,
.page-about__team-member {
  background-color: var(--color-card-bg);
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--color-border);
}

.page-about__card-title,
.page-about__member-name {
  font-size: 1.4em;
  color: var(--color-text-main);
  margin-bottom: 15px;
  font-weight: bold;
}

.page-about__card-text,
.page-about__member-role {
  font-size: 0.95em;
  color: var(--color-text-secondary);
}

.page-about__team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
  border: 3px solid var(--color-main);
  box-shadow: 0 0 15px rgba(var(--color-main), 0.5);
}

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

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

.page-about__faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  cursor: pointer;
  color: var(--color-text-main);
  font-weight: bold;
  font-size: 1.1em;
  background-color: var(--color-deep-green);
  transition: background-color 0.3s ease;
  list-style: none; /* For details/summary */
}

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

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

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

.page-about__faq-toggle {
  font-size: 1.5em;
  line-height: 1;
  margin-left: 15px;
}

.page-about__faq-answer {
  padding: 0 20px 20px 20px;
  color: var(--color-text-secondary);
  font-size: 1em;
  line-height: 1.7;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.page-about__faq-item[open] .page-about__faq-answer {
  max-height: 500px; /* Sufficient height for most answers */
  padding-top: 15px;
}

/* Ensure the + / - toggle works for details */
.page-about__faq-item[open] .page-about__faq-toggle {
  content: '−';
}

/* Responsive Styles */
@media (max-width: 992px) {
  .page-about__content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .page-about {
    font-size: 16px;
    line-height: 1.6;
  }

  .page-about__container {
    padding: 0 15px; /* Add padding for mobile */
  }

  .page-about__hero-section {
    padding: 40px 15px;
    padding-top: 10px !important; /* body handles header offset, small top padding */
  }

  .page-about__hero-title {
    font-size: 2em; /* Smaller on mobile */
  }

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

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

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

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

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

  .page-about__intro-section,
  .page-about__mission-vision-section,
  .page-about__history-section,
  .page-about__values-section,
  .page-about__experience-section,
  .page-about__security-section,
  .page-about__csr-section,
  .page-about__team-section,
  .page-about__future-section,
  .page-about__faq-section,
  .page-about__cta-section {
    padding: 50px 0;
  }

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

  .page-about__section,
  .page-about__card,
  .page-about__container,
  .page-about__hero-image-wrapper,
  .page-about__content-item,
  .page-about__value-card,
  .page-about__team-member,
  .page-about__faq-item {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important; /* Ensure no overflow */
  }

  .page-about__values-grid,
  .page-about__team-grid {
    grid-template-columns: 1fr;
  }

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

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