:root {
  --primary-color: #11A84E;
  --secondary-color: #22C768;
  --text-main-color: #F2FFF6;
  --text-secondary-color: #A7D9B8;
  --card-bg-color: #11271B;
  --background-color: #08160F;
  --button-gradient: linear-gradient(180deg, #2AD16F 0%, #13994A 100%);
  --border-color: #2E7A4E;
  --glow-color: #57E38D;
  --gold-color: #F2C14E;
  --divider-color: #1E3A2A;
  --deep-green-color: #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(--text-main-color); /* Default text color for the page, assuming dark body background */
  background-color: var(--background-color);
}

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

.page-about__grid {
  display: grid;
  gap: 30px;
}

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

.page-about__text-block {
  font-size: 1.1em;
  margin-bottom: 20px;
  color: var(--text-secondary-color);
}

/* Hero Section */
.page-about__hero-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  padding-top: 10px; /* Small top padding, body handles --header-offset */
  text-align: center;
  background-color: var(--background-color);
}

.page-about__hero-image-wrapper {
  width: 100%;
  max-width: 1920px;
  margin-bottom: 30px;
}

.page-about__hero-image {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.page-about__hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.page-about__main-title {
  font-weight: bold;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--gold-color); /* Using gold for main title for prominence */
  margin-bottom: 20px;
  font-size: clamp(2.2em, 4vw, 3.5em); /* Responsive font size for H1 */
}

.page-about__description {
  font-size: 1.3em;
  color: var(--text-secondary-color);
  margin-bottom: 30px;
}

.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;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.page-about__btn-primary {
  background: var(--button-gradient);
  color: var(--text-main-color);
  border: none;
}

.page-about__btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.page-about__btn-secondary {
  background: transparent;
  color: var(--text-main-color); /* Light text for dark background */
  border: 2px solid var(--text-main-color);
}

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

/* Light Background Section */
.page-about__light-bg {
  background-color: var(--text-main-color); /* Light background */
  color: #333333; /* Dark text for light background */
  padding: 80px 0;
}

.page-about__light-bg .page-about__section-title {
  color: var(--deep-green-color); /* Dark title for light background */
}

.page-about__light-bg .page-about__text-block {
  color: #555555; /* Darker text for light background */
}

.page-about__light-bg .page-about__btn-secondary {
  color: var(--primary-color); /* Primary color text for light background */
  border: 2px solid var(--primary-color);
}

.page-about__light-bg .page-about__btn-secondary:hover {
  background: var(--primary-color);
  color: var(--text-main-color);
}

/* Dark Section */
.page-about__dark-section {
  background-color: var(--background-color);
  color: var(--text-main-color);
  padding: 80px 0;
}

.page-about__dark-section .page-about__section-title {
  color: var(--gold-color);
}

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

/* Intro Section */
.page-about__intro-section .page-about__text-block {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* Mission & Vision Section */
.page-about__mission-vision-section .page-about__grid {
  grid-template-columns: 1fr 1fr;
}

.page-about__mission-card,
.page-about__vision-card {
  background-color: var(--card-bg-color);
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.page-about__card-title {
  font-size: 1.8em;
  font-weight: bold;
  color: var(--gold-color);
  margin-bottom: 15px;
}

.page-about__card-text {
  color: var(--text-secondary-color);
  margin-bottom: 20px;
}

.page-about__card-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-top: auto; /* Push image to bottom if content above varies */
}

/* Values Section */
.page-about__values-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
}

.page-about__value-item {
  background-color: var(--card-bg-color);
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
  text-align: center;
}

.page-about__light-bg .page-about__value-item {
  background-color: #ffffff; /* White card on light background */
  color: #333333;
}

.page-about__value-title {
  font-size: 1.5em;
  font-weight: bold;
  color: var(--gold-color);
  margin-bottom: 10px;
}

.page-about__light-bg .page-about__value-title {
  color: var(--deep-green-color); /* Dark title on light card */
}

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

.page-about__light-bg .page-about__value-description {
  color: #555555;
}

/* Why Choose Us Section */
.page-about__why-choose-us-section .page-about__feature-list {
  list-style: none;
  padding: 0;
  margin-top: 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.page-about__feature-item {
  background-color: var(--card-bg-color);
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
}

.page-about__feature-title {
  font-size: 1.4em;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 10px;
}

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

.page-about__why-choose-us-image {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  margin-top: 20px;
}

/* Security Section */
.page-about__security-section .page-about__grid {
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.page-about__security-image-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about__security-image {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.page-about__security-content .page-about__btn-primary {
  margin-top: 20px;
}

/* CTA Bottom Section */
.page-about__cta-bottom-section {
  text-align: center;
}

.page-about__cta-bottom-content {
  max-width: 900px;
  margin: 0 auto;
}

/* Responsive Design */
/* All images basic responsive styles */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* All sections, cards, containers for mobile */
@media (max-width: 768px) {
  .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__intro-section,
  .page-about__mission-vision-section,
  .page-about__values-section,
  .page-about__why-choose-us-section,
  .page-about__security-section,
  .page-about__cta-bottom-section {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden !important;
  }

  /* Specific padding for hero/video sections - small top padding */
  .page-about__hero-section {
    padding-top: 10px !important;
    padding-bottom: 20px !important;
  }

  /* Adjust grid columns for mobile */
  .page-about__grid {
    grid-template-columns: 1fr;
  }

  /* Buttons mobile adaptation */
  .page-about__cta-button,
  .page-about__btn-primary,
  .page-about__btn-secondary,
  .page-about a[class*="button"],
  .page-about a[class*="btn"] {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    white-space: normal !important;
    word-wrap: break-word !important;
    padding-left: 15px;
    padding-right: 15px;
  }

  .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;
    flex-wrap: wrap !important;
    gap: 10px;
    flex-direction: column; /* Stack buttons vertically */
  }

  .page-about__feature-list {
    grid-template-columns: 1fr;
  }

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

  .page-about__main-title {
    font-size: clamp(1.8em, 7vw, 2.5em);
  }

  .page-about__description {
    font-size: 1em;
  }

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

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

  .page-about__text-block {
    font-size: 0.9em;
  }
}