.page-about {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333333;
  background-color: #F5F7FA; /* Custom background color for about page content */
}

.page-about__hero-section {
  padding-top: 10px; /* Small top padding, relying on body for header offset */
  padding-bottom: 40px;
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  color: #ffffff;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.page-about__hero-image-wrapper {
  max-width: 100%;
  overflow: hidden;
  box-sizing: border-box;
}

.page-about__hero-image {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.page-about__hero-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-about__main-title {
  font-weight: bold;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 15px;
  color: #ffffff;
  font-size: clamp(2em, 4vw, 3.5em);
}

.page-about__intro-text {
  font-size: 1.1em;
  margin-bottom: 30px;
  color: #f0f0f0;
}

.page-about__cta-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.page-about__btn {
  padding: 12px 25px;
  border-radius: 8px;
  font-weight: bold;
  text-decoration: none;
  transition: background-color 0.3s ease, transform 0.2s ease;
  white-space: normal;
  word-wrap: break-word;
  max-width: 100%;
  box-sizing: border-box;
  text-align: center;
}

.page-about__btn-primary {
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  color: #ffffff;
  border: 2px solid transparent;
}

.page-about__btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(229, 57, 53, 0.4);
}

.page-about__btn-secondary {
  background: #ffffff;
  color: #E53935;
  border: 2px solid #E53935;
}

.page-about__btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255, 90, 79, 0.2);
}

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

.page-about__light-bg {
  background-color: #FFFFFF;
  color: #333333;
}

.page-about__dark-section {
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  color: #ffffff;
}

.page-about__container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.page-about__section-title {
  font-size: 2.5em;
  font-weight: bold;
  text-align: center;
  margin-bottom: 40px;
  color: #E53935;
}

.page-about__section-title--white {
  color: #ffffff;
}

.page-about__paragraph {
  font-size: 1.05em;
  margin-bottom: 20px;
  line-height: 1.7;
}

.page-about__paragraph--white {
  color: #f0f0f0;
}

.page-about__inline-link {
  color: inherit;
  text-decoration: underline;
  font-weight: bold;
}

.page-about__inline-link:hover {
  color: #FF5A4F;
}

.page-about__figure {
  margin: 30px 0;
  text-align: center;
}

.page-about__image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.page-about__figcaption {
  font-size: 0.9em;
  color: #666666;
  margin-top: 10px;
}

.page-about__figcaption--white {
  color: #f0f0f0;
}

.page-about__features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.page-about__feature-card {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  text-align: left;
  color: #ffffff;
}

.page-about__feature-title {
  font-size: 1.5em;
  font-weight: bold;
  margin-bottom: 15px;
  color: #ffffff;
}

.page-about__feature-description {
  font-size: 1em;
  line-height: 1.6;
  color: #f0f0f0;
}

.page-about__responsibility-list {
  list-style: none;
  padding: 0;
  margin-top: 30px;
}

.page-about__responsibility-item {
  background-color: #F5F7FA;
  border-left: 5px solid #E53935;
  padding: 15px 20px;
  margin-bottom: 15px;
  border-radius: 5px;
  font-size: 1.05em;
  color: #333333;
}

.page-about__responsibility-item strong {
  color: #E53935;
}

.page-about__promo-section {
  padding: 80px 0;
  text-align: center;
}

.page-about__promo-box {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 15px;
  padding: 50px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* --- Responsive Styles --- */

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

  /* 1. 顶区标题 + 双 CTA */
  .page-about__hero-section {
    padding-top: 10px !important; /* Small top padding, relying on body for header offset */
    padding-bottom: 30px;
  }

  .page-about__main-title {
    font-size: clamp(1.8em, 8vw, 2.5em) !important; /* Adjust H1 for mobile */
    margin-bottom: 10px;
  }

  .page-about__intro-text {
    font-size: 1em;
    margin-bottom: 20px;
  }

  .page-about__cta-buttons {
    flex-direction: column;
    gap: 10px;
    padding-left: 15px;
    padding-right: 15px;
  }

  .page-about__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;
  }

  /* 2. 单栏长文容器 */
  .page-about__container {
    padding: 0 15px !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

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

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

  .page-about__features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .page-about__feature-card {
    padding: 20px;
  }

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

  /* 3. 通用图片与 figure */
  .page-about img {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    display: block;
  }

  /* 4. 按钮与按钮容器 (already covered in CTA section, but ensuring explicit rules) */
  .page-about__btn-container,
  .page-about__button-group {
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding-left: 15px;
    padding-right: 15px;
    flex-wrap: wrap !important;
    gap: 10px;
  }

  /* 5. 注册教程与 FAQ 区块 (responsibility list acts as a simple list, no complex FAQ here) */
  .page-about__responsibility-item {
    font-size: 1em;
    padding: 12px 15px;
  }

  .page-about__promo-section {
    padding: 50px 0;
  }

  .page-about__promo-box {
    padding: 30px 20px;
  }
}

/* Tablet Specific Styles (max-width: 1024px) */
@media (max-width: 1024px) {
  .page-about__container {
    padding: 0 30px;
  }

  .page-about__main-title {
    font-size: clamp(2.5em, 5vw, 3em);
  }

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

  .page-about__features-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}