.page-about {
  --about-width: 260px;
  --about-glow: rgba(255, 140, 0, 0.12);
  position: relative;
  background-color: var(--bg-deep);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  color: var(--text-main);
}

.page-about .breadcrumb {
  margin: 0 0 20px;
  padding-top: 28px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.page-about .breadcrumb__link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--gold);
}

.page-about .breadcrumb__sep {
  margin: 0 10px;
  color: var(--line);
}

.page-about .breadcrumb__current {
  color: var(--gold);
}

.page-about__intro {
  position: relative;
  overflow: hidden;
  padding: 24px 0 56px;
}

.page-about__intro::after {
  content: "OUHUANG";
  position: absolute;
  right: -0.05em;
  bottom: -0.1em;
  font-family: var(--font-display);
  font-size: 18vw;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 140, 0, 0.09);
  pointer-events: none;
  white-space: nowrap;
  z-index: 0;
}

.page-about__intro-grid {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 32px;
  align-items: center;
}

.page-about__intro-copy {
  min-width: 0;
}

.page-about__title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about__title-strong {
  display: inline-block;
  color: var(--gold);
  background: linear-gradient(105deg, var(--bg-card) 0%, rgba(255, 140, 0, 0.14) 100%);
  padding: 0.04em 0.22em;
  border-radius: 2px;
  transform: skewX(-6deg);
  transform-origin: left center;
}

.page-about__lead {
  max-width: 34em;
  margin: 0 0 12px;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about__meta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  opacity: 0.8;
}

.page-about__intro-figure {
  position: relative;
  margin: 0;
}

.page-about__intro-figure::before {
  content: "ABOUT / VISUAL";
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  padding: 6px 10px;
  background: rgba(10, 10, 15, 0.82);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.page-about__intro-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  object-fit: cover;
}

.page-about__figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.page-about__layout {
  display: grid;
  gap: 48px;
  padding-bottom: 72px;
}

.page-about__toc {
  padding: 20px;
  background: rgba(26, 26, 36, 0.6);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about__toc-caption {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about__toc-nav {
  display: grid;
  gap: 2px;
}

.page-about__toc-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about__toc-link:last-child {
  border-bottom: 0;
}

.page-about__toc-link:hover {
  color: var(--text-main);
  padding-left: 4px;
}

.page-about__toc-link.is-active {
  color: var(--gold);
}

.page-about__toc-idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gold);
  opacity: 0.9;
}

.page-about__toc-rel {
  display: grid;
  gap: 4px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about__toc-rel .index-label {
  margin-bottom: 8px;
}

.page-about__content {
  min-width: 0;
}

.page-about__section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.page-about__section--wide {
  max-width: 860px;
}

.page-about__section--narrow {
  max-width: 620px;
}

.page-about__section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .heading-2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 2.2rem;
  letter-spacing: 0.01em;
}

.page-about__body-text {
  margin: 0 0 1em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about__body-text strong {
  color: var(--text-main);
}

.page-about__quote {
  margin: 28px 0;
  padding: 26px 28px;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(255, 140, 0, 0.08) 100%);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about__quote-text {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.6rem;
  line-height: 1.3;
  color: var(--gold-light);
}

.page-about__quote-cite {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-style: normal;
  color: var(--text-muted);
}

.page-about__spirit-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0;
}

.page-about__stat {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 118px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about__stat:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 140, 0, 0.5);
  animation: page-about-pulse 1.2s var(--ease) infinite;
}

@keyframes page-about-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(255, 140, 0, 0.1);
  }
  50% {
    box-shadow: 0 0 0 5px rgba(255, 140, 0, 0.06), 0 14px 32px rgba(255, 140, 0, 0.12);
  }
}

.page-about__stat:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.page-about__stat .stat__value {
  font-family: var(--font-display);
  font-size: 2.5rem;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.page-about__stat .stat__label {
  margin-top: 10px;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.page-about__data-figure {
  margin: 28px 0;
}

.page-about__data-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about__data-note {
  max-width: 460px;
  margin: 0 0 0 auto;
  padding: 20px 22px;
  background: rgba(255, 140, 0, 0.05);
  border: 1px dashed rgba(255, 140, 0, 0.4);
  border-radius: var(--radius);
}

.page-about__data-note p {
  margin: 12px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about__timeline {
  position: relative;
  margin-top: 32px;
  padding-left: 40px;
}

.page-about__timeline-line {
  position: absolute;
  left: 9px;
  top: 8px;
  width: 2px;
  height: calc(100% - 24px);
}

.page-about__milestone {
  position: relative;
  margin-bottom: 20px;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--gold);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about__milestone[open]::before {
  background: var(--gold);
  box-shadow: 0 0 10px rgba(255, 140, 0, 0.6);
}

.page-about__milestone summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  list-style: none;
  cursor: pointer;
}

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

.page-about__milestone summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--gold);
}

.page-about__milestone[open] summary::after {
  content: "－";
}

.page-about__milestone-year {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gold);
}

.page-about__milestone-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.page-about__milestone-desc {
  max-width: 520px;
  margin: 0 0 16px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about__team-intro {
  display: grid;
  gap: 24px;
  align-items: center;
  margin-bottom: 32px;
}

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

.page-about__team-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about__values {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about__value {
  position: relative;
  overflow: hidden;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about__value::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 140, 0, 0.18), transparent 70%);
}

.page-about__value-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gold);
}

.page-about__value h3 {
  position: relative;
  z-index: 1;
  margin: 8px 0 6px;
}

.page-about__value p {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.page-about__contact {
  margin-top: 36px;
  padding: 24px;
}

.page-about__contact p {
  max-width: 520px;
  margin: 12px 0 20px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about__closing {
  max-width: 860px;
  margin-top: 64px;
  padding: 40px 0 32px;
  border-top: 1px solid var(--line);
}

.page-about__saying {
  margin: 0;
  max-width: 60ch;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about__closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about__region {
  display: block;
  width: 100%;
  overflow: hidden;
  border-top: 1px solid var(--line);
}

.page-about__region-svg {
  display: block;
  width: 100%;
  height: 160px;
}

@media (min-width: 640px) {
  .page-about__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about__stat:last-child:nth-child(odd) {
    grid-column: auto;
  }

  .page-about__values {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about__region-svg {
    height: 190px;
  }
}

@media (min-width: 900px) {
  .page-about__intro {
    padding-top: 40px;
    padding-bottom: 72px;
  }

  .page-about__intro-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 40px;
  }

  .page-about__layout {
    grid-template-columns: var(--about-width) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about__toc {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about__section {
    padding: 56px 0;
  }

  .page-about__team-intro {
    grid-template-columns: 1fr 1.2fr;
    gap: 36px;
  }

  .page-about__region-svg {
    height: 220px;
  }
}