.page-about {
  --about-line: rgba(212, 175, 55, 0.22);
  --about-line-subtle: rgba(212, 175, 55, 0.1);
  --about-grid-strong: rgba(212, 175, 55, 0.05);
  --about-gold-glow: rgba(212, 175, 55, 0.12);
  background: var(--c-primary);
  color: var(--c-text);
  min-height: 60vh;
}

/* 首屏 Hero */
.page-about__hero {
  position: relative;
  padding: 2.75rem 0 3.25rem;
  background: linear-gradient(180deg, rgba(4, 16, 32, 0.72) 0%, rgba(10, 30, 63, 0.88) 100%);
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-strong) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-gold-glow) 0%, transparent 68%);
  pointer-events: none;
}

.page-about__hero-index {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.6875rem;
  color: rgba(212, 175, 55, 0.45);
  letter-spacing: 0.22em;
  writing-mode: vertical-rl;
  pointer-events: none;
  z-index: 2;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1.5rem;
  align-items: center;
}

.page-about__hero-copy {
  max-width: 44em;
}

.page-about__hero-copy .lede {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--c-text-sub);
  margin: 1.25rem 0 1.5rem;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about__hero-figure {
  margin: 0;
}

.page-about__hero-figure img {
  width: 100%;
  max-width: 320px;
  height: auto;
  object-fit: contain;
  display: block;
  margin-inline: auto;
  filter: drop-shadow(0 24px 36px rgba(0, 0, 0, 0.42));
}

/* 区块头部 */
.page-about__section-head {
  position: relative;
  padding-left: 3.25rem;
  margin-bottom: 1.75rem;
  max-width: 48em;
}

.page-about__section-index {
  position: absolute;
  left: 0;
  top: 0.125rem;
  font-family: var(--font-head);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--c-gold);
  opacity: 0.72;
  line-height: 1.2;
}

.page-about__section-head h2 {
  font-family: var(--font-head);
  font-size: 1.75rem;
  line-height: 1.32;
  color: var(--c-text);
  margin: 0.5rem 0 0.375rem;
}

.page-about__section-note {
  color: var(--c-text-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

/* 我们是谁 */
.page-about__identity {
  position: relative;
  background: var(--c-primary-light);
  border-block: 1px solid var(--about-line-subtle);
  overflow: hidden;
}

.page-about__identity::after {
  content: "";
  position: absolute;
  right: -2rem;
  top: 2rem;
  bottom: 2rem;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--about-line) 25%, var(--about-line) 75%, transparent);
}

.page-about__identity-grid {
  display: grid;
  gap: 2rem;
}

.page-about__identity-copy p {
  color: var(--c-text-sub);
  line-height: 1.85;
  margin: 0 0 1rem;
}

.page-about__identity-copy p:first-child {
  color: var(--c-text);
  font-size: 1.0625rem;
}

.page-about__identity-stats {
  display: grid;
  gap: 0.75rem;
  margin: 0;
}

.page-about__stat-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: rgba(4, 16, 32, 0.35);
  border: 1px solid var(--about-line-subtle);
  border-left: 3px solid var(--c-gold);
  gap: 1rem;
}

.page-about__stat-item dt {
  color: var(--c-text-sub);
  font-size: 0.9375rem;
}

.page-about__stat-item dd {
  color: var(--c-gold);
  font-family: var(--font-head);
  font-size: 1.375rem;
  font-weight: 700;
  margin: 0;
  white-space: nowrap;
}

/* 发展历程 */
.page-about__milestones {
  position: relative;
  background: var(--c-primary-dark);
  overflow: hidden;
}

.page-about__milestones::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-strong) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-about__timeline {
  list-style: none;
  margin: 0 0 2.25rem;
  padding: 0;
  position: relative;
  display: grid;
  gap: 1.5rem;
}

.page-about__milestone {
  position: relative;
  padding-left: 1.5rem;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: 0.375rem;
  top: 0.5rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.12), 0 0 14px rgba(212, 175, 55, 0.28);
  z-index: 1;
}

.page-about__milestone::after {
  content: "";
  position: absolute;
  left: 0.6875rem;
  top: 1.5rem;
  bottom: -1.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line), transparent);
}

.page-about__milestone:last-child::after {
  display: none;
}

.page-about__milestone-card {
  position: relative;
  background: rgba(27, 58, 107, 0.4);
  border: 1px solid var(--about-line-subtle);
  padding: 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.page-about__milestone-card:hover,
.page-about__milestone-card:focus-within {
  border-color: rgba(212, 175, 55, 0.5);
  box-shadow: 0 0 0 1px rgba(212, 175, 55, 0.18), 0 12px 28px rgba(0, 0, 0, 0.28);
}

.page-about__milestone-era {
  display: inline-block;
  font-family: var(--font-head);
  color: var(--c-gold);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.page-about__milestone-card h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--c-text);
  margin: 0 0 0.5rem;
}

.page-about__milestone-card > p {
  color: var(--c-text-sub);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0 0 0.75rem;
}

.page-about__milestone-card details {
  font-size: 0.875rem;
  border-top: 1px dashed var(--about-line-subtle);
  padding-top: 0.625rem;
}

.page-about__milestone-card summary {
  cursor: pointer;
  color: var(--c-gold-light);
  font-weight: 600;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  transition: color var(--transition);
}

.page-about__milestone-card summary::-webkit-details-marker {
  display: none;
}

.page-about__milestone-card summary::before {
  content: "+";
  display: inline-block;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--c-gold);
  transition: transform var(--transition);
}

.page-about__milestone-card details[open] summary::before {
  transform: rotate(45deg);
}

.page-about__milestone-card details ul {
  margin: 0.625rem 0 0;
  padding-left: 1rem;
  color: var(--c-text-sub);
  display: grid;
  gap: 0.375rem;
}

.page-about__milestone-card details li::marker {
  color: var(--c-gold);
}

.page-about__timeline-still {
  margin: 0;
  position: relative;
  z-index: 1;
}

.page-about__timeline-still img {
  width: 100%;
  max-width: 560px;
  height: auto;
  display: block;
  margin-inline: auto;
  border: 1px solid var(--about-line-subtle);
  background: rgba(4, 16, 32, 0.5);
}

/* 团队与资质 */
.page-about__credentials {
  background: var(--c-primary);
}

.page-about__credentials-card {
  display: grid;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--c-primary-light);
  border: 1px solid var(--about-line-subtle);
  margin-bottom: 1.25rem;
}

.page-about__credentials-seal {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about__credentials-seal img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--c-gold);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.1), 0 0 22px rgba(212, 175, 55, 0.14);
  transition: box-shadow var(--transition), transform var(--transition);
}

.page-about__credentials-seal img:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 8px rgba(212, 175, 55, 0.14), 0 0 30px rgba(212, 175, 55, 0.2);
}

.page-about__credentials-facts h3 {
  font-family: var(--font-head);
  font-size: 1.375rem;
  line-height: 1.4;
  color: var(--c-text);
  margin: 0 0 0.625rem;
}

.page-about__credentials-facts > p {
  color: var(--c-text-sub);
  line-height: 1.75;
  margin: 0 0 1rem;
}

.page-about__credential-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.625rem;
}

.page-about__credential-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--c-text);
  font-size: 0.9375rem;
  line-height: 1.55;
}

.page-about__credential-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4375rem;
  width: 0.5rem;
  height: 0.5rem;
  border: 1px solid var(--c-gold);
  transform: rotate(45deg);
  background: rgba(212, 175, 55, 0.12);
}

.page-about__credentials-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 0;
}

.page-about__cred-stat {
  padding: 1rem;
  background: rgba(4, 16, 32, 0.35);
  border: 1px solid var(--about-line-subtle);
}

.page-about__cred-stat dt {
  color: var(--c-text-sub);
  font-size: 0.8125rem;
  margin-bottom: 0.25rem;
}

.page-about__cred-stat dd {
  color: var(--c-gold);
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

/* 湖北基因 */
.page-about__hubei {
  position: relative;
  background: var(--c-primary-dark);
  overflow: hidden;
}

.page-about__hubei::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-strong) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about__hubei-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about__hubei-copy p {
  color: var(--c-text-sub);
  line-height: 1.8;
  margin: 0 0 1rem;
}

.page-about__hubei-copy p:first-child {
  color: var(--c-text);
  font-size: 1.0625rem;
}

.page-about__hubei-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.page-about__hubei-silhouette {
  width: 220px;
  max-width: 70%;
  height: auto;
}

.page-about__hubei-caption {
  color: var(--c-text-sub);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-align: center;
  margin-top: 0.625rem;
}

/* 我们的理念 */
.page-about__philosophy {
  position: relative;
  background: linear-gradient(160deg, var(--c-primary-light) 0%, var(--c-primary) 55%, var(--c-primary-dark) 100%);
  border-top: 1px solid var(--about-line-subtle);
}

.page-about__philosophy-inner {
  max-width: 48rem;
}

.page-about__philosophy-quote {
  margin: 0 0 1.5rem;
  padding: 1.375rem 1.5rem;
  border-left: 4px solid var(--c-gold);
  background: rgba(212, 175, 55, 0.08);
}

.page-about__philosophy-quote p {
  font-family: var(--font-head);
  font-size: 1.1875rem;
  line-height: 1.65;
  color: var(--c-text);
  margin: 0;
}

.page-about__philosophy-copy {
  color: var(--c-text-sub);
  line-height: 1.8;
  margin-bottom: 1.75rem;
}

.page-about__philosophy-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* 窄屏与平板增强 */
@media (min-width: 600px) {
  .page-about__hero {
    padding: 3.5rem 0 4rem;
  }

  .page-about__hero-figure img {
    max-width: 380px;
  }

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

  .page-about__credentials-card {
    grid-template-columns: auto 1fr;
    gap: 1.75rem;
    align-items: center;
  }

  .page-about__credentials-seal img {
    width: 150px;
    height: 150px;
  }
}

/* 桌面端布局 */
@media (min-width: 960px) {
  .page-about__hero {
    padding: 4.5rem 0 6rem;
  }

  .page-about__hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 4rem;
  }

  .page-about__hero-figure img {
    max-width: 460px;
  }

  .page-about__hero-index {
    right: 2rem;
    top: 4.5rem;
  }

  .page-about__section-head {
    margin-bottom: 2.25rem;
  }

  .page-about__section-head h2 {
    font-size: 2rem;
  }

  .page-about__identity-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 4rem;
    align-items: start;
  }

  .page-about__stat-item {
    padding: 1.25rem 1.5rem;
  }

  .page-about__timeline {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.75rem;
    padding-top: 3.5rem;
    margin-bottom: 3rem;
  }

  .page-about__timeline::before {
    content: "";
    position: absolute;
    top: 1rem;
    left: 2rem;
    right: 2rem;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.55) 12%, var(--c-gold) 50%, rgba(212, 175, 55, 0.55) 88%, transparent);
  }

  .page-about__timeline::after {
    content: "";
    position: absolute;
    top: 0.625rem;
    left: 50%;
    transform: translateX(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--c-gold-light);
    box-shadow: 0 0 16px rgba(212, 175, 55, 0.6);
  }

  .page-about__milestone {
    padding-left: 0;
  }

  .page-about__milestone::before {
    left: 50%;
    transform: translateX(-50%);
    top: -2rem;
    width: 0.9375rem;
    height: 0.9375rem;
    box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.12), 0 0 16px rgba(212, 175, 55, 0.35);
  }

  .page-about__milestone::after {
    display: none;
  }

  .page-about__milestone-card {
    min-height: 260px;
  }

  .page-about__milestone-card::before {
    content: "";
    position: absolute;
    top: -1.125rem;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 1.125rem;
    background: linear-gradient(180deg, rgba(212, 175, 55, 0.55), rgba(212, 175, 55, 0.04));
  }

  .page-about__timeline-still img {
    max-width: 620px;
    margin-right: 0;
  }

  .page-about__credentials-card {
    grid-template-columns: auto 1fr;
    gap: 2.25rem;
    padding: 2rem;
    align-items: center;
  }

  .page-about__credentials-seal img {
    width: 200px;
    height: 200px;
  }

  .page-about__credentials-stats {
    gap: 1rem;
    margin-top: 1.5rem;
  }

  .page-about__cred-stat {
    padding: 1.25rem 1rem;
  }

  .page-about__hubei-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    gap: 4rem;
    align-items: center;
  }

  .page-about__hubei-silhouette {
    width: 280px;
  }

  .page-about__philosophy-quote {
    padding: 1.75rem 2rem;
  }

  .page-about__philosophy-quote p {
    font-size: 1.375rem;
  }
}