.page-about {
  --about-gold-ring: rgba(201, 169, 97, 0.38);
  --about-line-dim: rgba(138, 143, 152, 0.5);
  position: relative;
  background: var(--color-beige);
  color: var(--color-ink);
  font-family: var(--font-body);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  padding-top: var(--sp-3);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: var(--sp-4) 0 var(--sp-6);
  background-color: var(--color-navy);
  color: var(--color-beige);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 241, 232, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 241, 232, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -18%;
  width: 78%;
  height: 46%;
  background: rgba(201, 169, 97, 0.07);
  transform: rotate(-18deg);
  pointer-events: none;
}

.page-about .about-hero-outer {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}

.page-about .about-hero-chip {
  display: inline-block;
  margin-bottom: var(--sp-2);
  padding: var(--sp-1) var(--sp-2);
  border-left: 3px solid var(--color-gold);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--color-gold);
}

.page-about .about-hero h1 {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-beige);
}

.page-about .about-hero-lead {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(1.1rem, 2.4vw, 1.6rem);
  line-height: 1.5;
  color: var(--color-gold);
}

.page-about .about-hero-desc {
  margin: 0;
  max-width: 42em;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.82);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.page-about .about-hero-visual {
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-hero-figure {
  margin: 0;
  padding: var(--sp-2);
  border: 1px solid var(--about-gold-ring);
  background: rgba(201, 169, 97, 0.08);
}

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

.page-about .about-hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-2);
}

.page-about .about-hero-metrics .metric {
  padding: var(--sp-3) var(--sp-2);
  border: 1px solid rgba(201, 169, 97, 0.28);
  border-top: 3px solid var(--color-gold);
  background: rgba(11, 30, 54, 0.6);
  text-align: center;
}

.page-about .about-hero-metrics .metric-value {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1.15;
  color: var(--color-gold);
}

.page-about .about-hero-metrics .metric-label {
  display: block;
  margin-top: var(--sp-1);
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: rgba(245, 241, 232, 0.75);
}

.page-about .about-section-head {
  margin-bottom: var(--sp-4);
  max-width: 760px;
}

.page-about .about-section-head h2 {
  margin: var(--sp-1) 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.25;
  color: var(--color-ink);
}

.page-about .about-section-intro {
  margin: var(--sp-3) 0 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--color-moss);
}

.page-about .about-trajectory {
  position: relative;
  padding: var(--sp-5) 0 var(--sp-6);
  background-color: var(--color-beige);
  background-image:
    linear-gradient(var(--color-mist) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-mist) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-2);
}

.page-about .about-timeline-item {
  position: relative;
  border-left: 2px solid var(--color-gold);
  padding-left: var(--sp-4);
}

.page-about .about-timeline-item details summary {
  list-style: none;
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--sp-2);
  padding: var(--sp-2) 0;
  cursor: pointer;
  font-family: var(--font-head);
}

.page-about .about-timeline-item details summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-item details summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-link);
}

.page-about .about-timeline-item details[open] summary::after {
  content: "－";
  color: var(--color-gold);
}

.page-about .about-timeline-item details summary::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--sp-4) - 7px);
  top: 1.05rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 2px solid var(--color-gold);
}

.page-about .about-tl-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-line);
}

.page-about .about-tl-version {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-navy);
}

.page-about .about-tl-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-ink);
}

.page-about .about-tl-desc {
  margin: var(--sp-1) 0 var(--sp-2);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--color-moss);
}

.page-about .about-timeline-figure {
  margin: var(--sp-4) 0 0;
  border: 1px solid var(--color-mist);
  background: #FBF8F2;
}

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

.page-about .about-credentials {
  background-color: var(--color-navy);
  color: var(--color-beige);
}

.page-about .about-credentials .about-section-head h2 {
  color: var(--color-beige);
}

.page-about .about-credentials .about-section-intro {
  color: rgba(245, 241, 232, 0.72);
}

.page-about .about-credentials .section-subhead {
  color: var(--color-gold);
}

.page-about .about-creds {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line-dim);
  border-bottom: 1px solid var(--about-line-dim);
}

.page-about .about-creds-item {
  padding: var(--sp-3) 0;
}

.page-about .about-creds-item + .about-creds-item {
  border-top: 1px solid var(--about-line-dim);
}

.page-about .about-creds-name {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--color-beige);
}

.page-about .about-creds-status {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin: 0 0 var(--sp-2);
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-gold);
}

.page-about .about-creds-status .status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
}

.page-about .about-creds-note {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.7);
}

.page-about .about-creds-status::after {
  display: none;
}

.page-about .about-creds-links {
  margin-top: var(--sp-4);
  text-align: center;
}

.page-about .about-ecosystem {
  padding: var(--sp-5) 0 var(--sp-6);
  background-color: var(--color-beige);
}

.page-about .about-eco-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
  align-items: center;
}

.page-about .about-eco-copy p {
  margin: 0 0 var(--sp-3);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-ink);
}

.page-about .about-eco-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.page-about .about-eco-network {
  border: 1px solid var(--color-mist);
  background: #FBF8F2;
  padding: var(--sp-2);
}

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

.page-about .about-team-figure {
  margin: var(--sp-4) 0 0;
  border: 1px solid var(--color-mist);
  background: #FBF8F2;
}

.page-about .about-team-figure figcaption,
.page-about .about-timeline-figure figcaption {
  padding: var(--sp-2) var(--sp-3);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--color-moss);
  background: var(--color-mist);
}

@media (min-width: 800px) {
  .page-about .about-hero {
    padding-top: var(--sp-5);
  }

  .page-about .about-hero-outer {
    grid-template-columns: 7fr 5fr;
    gap: var(--sp-5);
    align-items: center;
  }

  .page-about .about-hero-figure {
    padding: var(--sp-3);
  }

  .page-about .about-hero-metrics {
    gap: var(--sp-3);
  }

  .page-about .about-section-head {
    margin-bottom: var(--sp-5);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, 1fr);
    gap: var(--sp-3);
    position: relative;
    padding-top: 4px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 14px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-gold);
  }

  .page-about .about-timeline-item {
    border-left: 0;
    padding: var(--sp-4) var(--sp-2) 0;
    text-align: center;
  }

  .page-about .about-timeline-item details summary {
    flex-direction: column;
    justify-content: center;
    gap: var(--sp-1);
    text-align: center;
  }

  .page-about .about-timeline-item details summary::after {
    margin-left: 0;
  }

  .page-about .about-timeline-item details summary::before {
    left: 50%;
    top: -18px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item details[open] summary::before {
    background: var(--color-gold);
  }

  .page-about .about-tl-desc {
    padding-top: var(--sp-1);
  }

  .page-about .about-creds-item {
    display: grid;
    grid-template-columns: 1.1fr 0.8fr 1.6fr;
    align-items: center;
    gap: var(--sp-4);
    padding: var(--sp-3) var(--sp-2);
  }

  .page-about .about-creds-name {
    margin: 0;
  }

  .page-about .about-creds-status {
    margin: 0;
  }

  .page-about .about-creds-status::after {
    content: "可在“联系反馈”页获取官方渠道进行核对";
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: 230px;
    padding: var(--sp-2) var(--sp-3);
    border-left: 2px solid var(--color-gold);
    background: var(--color-beige);
    color: var(--color-ink);
    font-family: var(--font-body);
    font-size: 0.8rem;
    line-height: 1.6;
    box-shadow: 0 0 0 1px var(--color-mist);
    z-index: 4;
  }

  .page-about .about-creds-item:hover .about-creds-status::after {
    display: block;
  }

  .page-about .about-eco-layout {
    grid-template-columns: 5fr 4fr;
    gap: var(--sp-5);
  }
}