.page-about {
  background: var(--color-primary-deep);
  overflow-x: hidden;
}

/* Hero */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 48px;
  background:
    linear-gradient(150deg, rgba(255, 107, 53, 0.06) 0%, transparent 35%),
    linear-gradient(150deg, var(--color-primary-deep), var(--color-primary) 65%, var(--color-surface-dark));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -24%;
  width: 70%;
  height: 90%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(212, 175, 55, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 32px;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.page-about .breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--speed-fast);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--color-gold-bright);
}

.page-about .crumb-sep {
  color: var(--color-border);
}

.page-about .crumb-current {
  color: var(--color-gold-bright);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-hero-copy .tag {
  margin-bottom: 16px;
}

.page-about h1 {
  margin: 18px 0 20px;
  max-width: 780px;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.page-about .lead {
  max-width: 640px;
  color: var(--color-muted);
  font-size: 1.0625rem;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-visual {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-dark);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero-visual figcaption,
.page-about .about-cert-visual figcaption,
.page-about .about-eco-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background: rgba(255, 255, 255, 0.03);
}

/* 品牌故事 */
.page-about .about-story {
  background: var(--color-primary-deep);
}

.page-about .section-head {
  margin-bottom: 40px;
}

.page-about .section-title {
  margin-top: 12px;
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.page-about .section-desc {
  margin-top: 12px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-muted);
  max-width: 680px;
}

.page-about .about-story-grid {
  display: grid;
  gap: 40px;
  margin-top: 40px;
}

.page-about .about-story-copy p {
  margin: 0 0 20px;
  line-height: 1.8;
  color: var(--color-muted);
}

.page-about .about-story-copy strong {
  color: var(--color-text);
  font-weight: 600;
}

.page-about .about-story-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  align-content: start;
}

.page-about .about-story-stats .stat {
  background: var(--color-surface-dark);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--speed-base), transform var(--speed-base);
}

.page-about .about-story-stats .stat:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold);
}

.page-about .about-story-stats .stat-num {
  color: var(--color-gold-bright);
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.1;
}

.page-about .about-story-stats .stat-label {
  color: var(--color-muted);
  font-size: 13px;
}

/* 发展里程碑 */
.page-about .about-milestones {
  position: relative;
  background:
    linear-gradient(180deg, rgba(13, 43, 86, 0.55), transparent 30%),
    var(--color-primary);
}

.page-about .about-timeline {
  position: relative;
  max-width: 1060px;
  margin: 56px auto 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 15px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-orange) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  display: grid;
  gap: 14px;
  margin-bottom: 48px;
  padding-left: 52px;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: 0;
  top: 8px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-gold);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.14);
}

.page-about .about-timeline-card {
  background: var(--color-surface-dark);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  transition: border-color var(--speed-base), transform var(--speed-base);
}

.page-about .about-timeline-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold);
}

.page-about .about-timeline-card h3 {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.page-about .about-timeline-card p {
  margin-bottom: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-timeline-meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-timeline-year {
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--color-text);
}

.page-about .about-timeline-year::after {
  content: "";
  display: inline-block;
  width: 28px;
  height: 2px;
  margin-left: 12px;
  vertical-align: middle;
  background: var(--color-orange);
}

.page-about .about-timeline-label {
  font-size: 13px;
  color: var(--color-gold-bright);
}

/* 资质与认证（浅色文档区域） */
.page-about .about-certifications {
  background: var(--color-surface-light);
  color: var(--color-primary);
}

.page-about .about-certifications .section-title {
  color: var(--color-primary);
}

.page-about .about-certifications .section-desc {
  color: #41546D;
}

.page-about .about-cert-layout {
  display: grid;
  gap: 32px;
  margin-top: 40px;
}

.page-about .about-cert-grid {
  display: grid;
  gap: 16px;
}

.page-about .about-cert-card {
  position: relative;
  background: #ffffff;
  border: 1px solid #D8E0EA;
  border-radius: var(--radius-lg);
  padding: 24px;
  overflow: hidden;
  transition: transform var(--speed-base) var(--ease-out), box-shadow var(--speed-base), border-color var(--speed-base);
}

.page-about .about-cert-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.1), transparent 55%);
  opacity: 0;
  transition: opacity var(--speed-base);
}

.page-about .about-cert-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold);
  box-shadow: 0 16px 32px rgba(7, 23, 51, 0.1);
}

.page-about .about-cert-card:hover::after {
  opacity: 1;
}

.page-about .about-cert-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--color-primary);
  color: var(--color-gold-bright);
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}

.page-about .about-cert-badge svg {
  display: block;
  flex: 0 0 auto;
}

.page-about .about-cert-card h3 {
  color: var(--color-primary);
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about .about-cert-card p {
  color: #4A5A70;
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0 0 12px;
  transition: color var(--speed-base);
}

.page-about .about-cert-card:hover p {
  color: var(--color-primary-deep);
}

.page-about .about-cert-extra {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-gold-dim);
  font-weight: 700;
  opacity: 0.65;
  transform: translateX(0);
  transition: opacity var(--speed-base), transform var(--speed-base);
}

.page-about .about-cert-card:hover .about-cert-extra {
  opacity: 1;
  transform: translateX(4px);
}

.page-about .about-cert-extra::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-orange);
  flex: 0 0 auto;
}

.page-about .about-cert-visual {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #ffffff;
  border: 1px solid #D8E0EA;
}

.page-about .about-cert-visual img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-cert-visual figcaption {
  color: #4A5A70;
  background: transparent;
}

/* 合作生态 */
.page-about .about-ecosystem {
  background:
    radial-gradient(1200px 300px at 80% -10%, rgba(212, 175, 55, 0.08), transparent 60%),
    var(--color-primary-deep);
}

.page-about .about-eco-grid {
  display: grid;
  gap: 40px;
  margin-top: 40px;
}

.page-about .about-eco-content .lead {
  max-width: 560px;
}

.page-about .about-eco-content .list-check {
  margin: 24px 0;
}

.page-about .about-eco-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-eco-figure {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-dark);
  box-shadow: var(--shadow-card);
}

.page-about .about-eco-figure img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-eco-figure figcaption {
  background: rgba(255, 255, 255, 0.03);
}

/* 联系横幅 */
.page-about .about-contact-banner {
  background: var(--color-primary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.page-about .about-contact-banner-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: flex-start;
}

.page-about .about-contact-banner-inner h2 {
  margin-top: 16px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
}

.page-about .about-contact-banner-inner p {
  color: var(--color-muted);
  max-width: 560px;
  line-height: 1.7;
}

/* 桌面端布局 */
@media (min-width: 768px) {
  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-timeline-item {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding-left: 0;
    margin-bottom: 56px;
  }

  .page-about .about-timeline-dot {
    left: 50%;
    top: 36px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    align-self: start;
    padding-top: 16px;
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-card {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-meta {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    align-items: flex-end;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-card {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-meta {
    grid-column: 2;
    grid-row: 1;
    text-align: left;
    align-items: flex-start;
  }

  .page-about .about-contact-banner-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-story-grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
  }

  .page-about .about-cert-layout {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: 48px;
  }

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

  .page-about .about-cert-card:nth-child(3) {
    grid-column: 1 / -1;
  }

  .page-about .about-eco-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 64px;
  }
}