.page-about {
  --page-bg: var(--bg-light);
  --page-text: var(--text-primary);
  --page-number-color: var(--accent-100);
  --page-accent: var(--accent-300);
  --page-border: var(--border);
  --page-card-bg: #ffffff;
  --page-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  --page-radius: 6px;
  --page-gap: 2rem;
}

.page-about .container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.page-about .breadcrumb {
  padding: 1.5rem 0 0.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  letter-spacing: 0.01em;
}

.page-about .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  border-color: var(--page-accent);
}

.page-about .breadcrumb-sep {
  color: var(--page-border);
  user-select: none;
}

.page-about .section-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--page-number-color);
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.2;
  color: var(--page-text);
  margin: 0 0 1rem;
}

.page-about .text-body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--page-text);
  margin: 0 0 1rem;
}

.page-about .text-secondary {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.page-about .text-mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.4;
  border-radius: var(--page-radius);
  border: 1.5px solid var(--page-border);
  background: transparent;
  color: var(--page-text);
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.page-about .btn:hover {
  border-color: var(--page-accent);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.page-about .btn-primary {
  background-color: var(--accent-300);
  border-color: var(--accent-300);
  color: #ffffff;
}

.page-about .btn-primary:hover {
  background-color: var(--accent-400);
  border-color: var(--accent-400);
}

.page-about .btn-outline {
  border-color: var(--page-border);
  color: var(--page-text);
}

.page-about .btn-outline:hover {
  border-color: var(--page-accent);
  background-color: rgba(107, 142, 35, 0.04);
}

/* ---------- 简介区 ---------- */
.page-about .intro-section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 2rem 0 2.5rem;
  border-bottom: 1px solid var(--page-border);
}

.page-about .intro-text {
  flex: 1;
}

.page-about .intro-paragraph {
  max-width: 54ch;
}

.page-about .intro-sub {
  margin-bottom: 1.5rem;
  max-width: 48ch;
}

.page-about .intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.page-about .intro-image {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .brand-logo-img {
  border-radius: var(--page-radius);
  object-fit: contain;
  max-width: 100%;
  height: auto;
  background: var(--primary-100);
  padding: 1rem;
  box-shadow: var(--page-shadow);
  border: 1px solid var(--page-border);
}

/* ---------- 核心功能 ---------- */
.page-about .features-section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--page-border);
}

.page-about .features-subtitle {
  margin-bottom: 2rem;
  max-width: 48ch;
}

.page-about .features-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.page-about .feature-item {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem 1.25rem 1.25rem 0;
  border-bottom: 1px solid var(--page-border);
  transition: background-color 0.2s ease;
  cursor: default;
}

.page-about .feature-item:last-child {
  border-bottom: none;
}

.page-about .feature-item:hover {
  background-color: rgba(107, 142, 35, 0.03);
}

.page-about .feature-number {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--page-number-color);
  line-height: 1;
  flex-shrink: 0;
  min-width: 2.2rem;
  opacity: 0.7;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .feature-item:hover .feature-number {
  opacity: 1;
  transform: scale(1.05);
}

.page-about .feature-content {
  flex: 1;
}

.page-about .feature-heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--page-text);
  margin: 0 0 0.35rem;
}

.page-about .feature-content .text-body {
  font-size: 0.9375rem;
  margin: 0;
  max-width: 52ch;
}

/* ---------- 功能配图 ---------- */
.page-about .features-media {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.page-about .feature-img-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.page-about .feature-img-block img {
  max-width: 100%;
  height: auto;
  border-radius: var(--page-radius);
  box-shadow: var(--page-shadow);
  border: 1px solid var(--page-border);
  object-fit: cover;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .feature-img-block img:hover {
  transform: scale(1.01);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.page-about .media-caption {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-align: center;
  letter-spacing: 0.02em;
}

/* ---------- 服务范围 ---------- */
.page-about .service-section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--page-border);
}

.page-about .service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.page-about .service-card {
  padding: 1.5rem;
  background: var(--page-card-bg);
  border-radius: var(--page-radius);
  border: 1px solid var(--page-border);
  box-shadow: var(--page-shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .service-card:hover {
  border-color: var(--page-number-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.page-about .service-card-icon {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.page-about .service-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.3;
  color: var(--page-text);
  margin: 0 0 0.4rem;
}

.page-about .service-card .text-body {
  font-size: 0.9375rem;
  margin: 0;
  max-width: 44ch;
}

/* ---------- 联系方式 ---------- */
.page-about .contact-note-section {
  padding: 2.5rem 0 3rem;
}

.page-about .contact-note-section .text-body {
  max-width: 52ch;
  margin-bottom: 1.5rem;
}

.page-about .contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.page-about .contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--page-border);
}

.page-about .contact-item:last-child {
  border-bottom: none;
}

.page-about .contact-label {
  color: var(--page-number-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.page-about .contact-value {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--page-text);
  word-break: break-all;
}

.page-about .contact-note {
  font-size: 0.8125rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--page-border);
  max-width: 50ch;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 768px) {
  .page-about .container {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }

  .page-about .intro-section {
    flex-direction: row;
    align-items: center;
    padding: 3rem 0 3.5rem;
    gap: 3rem;
  }

  .page-about .intro-image {
    flex: 0 0 auto;
  }

  .page-about .brand-logo-img {
    width: 200px;
    height: 200px;
  }

  .page-about .features-grid {
    gap: 0;
  }

  .page-about .feature-item {
    padding-left: 1.5rem;
  }

  .page-about .feature-number {
    font-size: 2rem;
    min-width: 2.6rem;
  }

  .page-about .features-media {
    flex-direction: row;
    gap: 2rem;
    justify-content: center;
  }

  .page-about .feature-img-block:first-child img {
    width: 400px;
    height: 300px;
  }

  .page-about .feature-img-block:last-child img {
    width: 250px;
    height: 500px;
  }

  .page-about .service-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .contact-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about .contact-item {
    padding: 0.75rem 0.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about .container {
    padding-left: 3rem;
    padding-right: 3rem;
  }

  .page-about .intro-section {
    padding: 4rem 0 4rem;
    gap: 4rem;
  }

  .page-about .features-section {
    padding: 3.5rem 0;
  }

  .page-about .service-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .contact-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .features-media {
    gap: 3rem;
  }
}