.page-about {
  --about-rail-w: 8.5rem;
  --about-serif-size: clamp(6rem, 20vw, 20rem);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .breadcrumb {
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
  font-size: 0.85rem;
}

.page-about .about-hero {
  position: relative;
  padding: 3.5rem 0 4rem;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(112deg, rgba(230, 57, 70, 0.14) 0%, rgba(230, 57, 70, 0.02) 38%, transparent 60%),
    var(--bg);
  overflow: hidden;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero__kicker {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--red);
}

.page-about .about-hero__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-size: clamp(1.9rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--ink);
  font-weight: 800;
}

.page-about .about-hero__title span {
  color: var(--red);
  margin: 0 0.15em;
  font-weight: 300;
}

.page-about .about-hero__lead {
  margin: 0 0 1.25rem;
  font-family: var(--font-head);
  font-size: clamp(1.15rem, 2.2vw, 1.9rem);
  letter-spacing: 0.04em;
  color: var(--blue);
}

.page-about .about-hero__desc {
  margin: 0 0 1.75rem;
  max-width: 64ch;
  color: var(--muted);
  font-size: 0.95rem;
}

.page-about .about-hero__desc a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 194, 255, 0.35);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-hero__desc a:hover {
  border-bottom-color: var(--blue);
  background: rgba(0, 194, 255, 0.06);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.page-about .about-hero__meta span {
  padding: 0.3rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.page-about .about-hero__meta span:nth-child(2) {
  border-color: rgba(230, 57, 70, 0.4);
  color: var(--red);
}

.page-about .about-hero__meta span:nth-child(3) {
  border-color: rgba(0, 194, 255, 0.4);
  color: var(--blue);
}

.page-about .about-hero__bg {
  position: absolute;
  right: -0.1em;
  top: -0.12em;
  z-index: 1;
  font-family: var(--font-head);
  font-size: var(--about-serif-size);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.05em;
  color: rgba(245, 242, 237, 0.045);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__pattern {
  position: absolute;
  left: 0;
  bottom: 1.5rem;
  z-index: 1;
  width: 260px;
  height: 260px;
  color: var(--blue);
  opacity: 0.07;
  pointer-events: none;
}

.page-about .about-layout {
  display: block;
}

.page-about .about-rail {
  display: none;
}

.page-about .about-content {
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  padding: 3rem 0.75rem 3.25rem;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 1.5rem;
}

.page-about .about-section:nth-child(even) {
  background: var(--surface);
}

.page-about .about-section__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__index {
  flex: 0 0 auto;
  padding: 0.25rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--red);
  border: 1px solid rgba(230, 57, 70, 0.25);
  background: rgba(230, 57, 70, 0.08);
}

.page-about .about-section__head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 2.4vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.page-about .about-section__head h2::before {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 1.1em;
  margin-right: 0.6rem;
  vertical-align: -0.2em;
  background: var(--red);
}

.page-about .about-source::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--red) 0 30%, var(--blue) 30% 42%, transparent 42%);
  opacity: 0.85;
}

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

.page-about .about-source__text p {
  margin: 0 0 1rem;
  color: var(--text);
}

.page-about .about-source__text strong {
  color: var(--ink);
}

.page-about .about-source__location {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-source__location::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: var(--red);
}

.page-about .evidence {
  margin: 1.25rem 0 0;
  padding: 1rem 1rem 1rem 1.25rem;
  border-left: 3px solid var(--red);
  background: rgba(230, 57, 70, 0.05);
  color: var(--muted);
  font-size: 0.88rem;
}

.page-about .evidence__label {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
}

.page-about .about-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
}

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

.page-about .about-media::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 2.4rem;
  height: 2.4rem;
  background: linear-gradient(135deg, transparent 50%, var(--red) 50%);
  opacity: 0.9;
}

.page-about .about-media--timeline::after {
  background: linear-gradient(135deg, transparent 50%, var(--blue) 50%);
}

.page-about .about-media--team::after {
  background: linear-gradient(135deg, transparent 50%, var(--gold) 50%);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-left: 120px solid transparent;
  border-top: 120px solid rgba(0, 194, 255, 0.06);
  pointer-events: none;
}

.page-about .about-timeline__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  border-left: 1px dashed var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2rem 2.5rem;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 0;
  top: 0.42rem;
  box-sizing: border-box;
  width: 1.05rem;
  height: 1.05rem;
  border: 3px solid var(--red);
  border-radius: 50%;
  background: var(--bg);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-timeline__item:nth-child(2) .about-timeline__dot {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(0, 194, 255, 0.12);
}

.page-about .about-timeline__item:nth-child(3) .about-timeline__dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(255, 179, 71, 0.14);
}

.page-about .about-timeline__item:nth-child(4) .about-timeline__dot {
  border-color: var(--red);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14);
}

.page-about .about-timeline__item:hover .about-timeline__dot {
  transform: scale(1.3);
  border-color: var(--ink);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.page-about .about-timeline__body p {
  margin: 0 0 0.5rem;
  color: var(--text);
  font-size: 0.92rem;
}

.page-about .about-timeline__bubble {
  display: inline-block;
  padding: 0.28rem 0.6rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__bubble {
  color: var(--ink);
  border-color: var(--blue);
  background: rgba(0, 194, 255, 0.05);
  transform: translateX(4px);
}

.page-about .about-media--timeline {
  align-self: start;
}

.page-about .about-team__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-team__content p {
  margin: 0 0 1rem;
  color: var(--text);
}

.page-about .about-team__content a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 194, 255, 0.35);
  transition: border-color 0.2s ease;
}

.page-about .about-team__content a:hover {
  border-bottom-color: var(--blue);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__roles li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.8rem 0.15rem;
  border-bottom: 1px solid var(--line);
  transition: background 0.18s ease;
}

.page-about .about-team__roles li:hover {
  background: rgba(255, 255, 255, 0.02);
}

.page-about .about-team__roles span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
}

.page-about .about-team__roles em {
  font-style: normal;
  font-size: 0.95rem;
  color: var(--ink);
}

.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-bottom: 2.25rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  padding: 1.4rem 0.75rem;
  text-align: center;
  background: var(--surface);
  transition: transform 0.18s ease, background 0.18s ease;
}

.page-about .about-stat:hover {
  transform: translateY(-2px);
  background: var(--bg);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .about-stat:nth-child(2) .about-stat__num {
  color: var(--blue);
}

.page-about .about-stat:nth-child(3) .about-stat__num {
  color: var(--gold);
}

.page-about .about-stat:nth-child(4) .about-stat__num {
  color: var(--red);
}

.page-about .about-stat__label {
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.15rem;
}

.page-about .about-scale__list li {
  display: grid;
  gap: 0.1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.18s ease;
}

.page-about .about-scale__list li:hover {
  background: rgba(255, 255, 255, 0.015);
}

.page-about .about-scale__list span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-scale__list strong {
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1.65;
  color: var(--text);
}

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

.page-about .about-sichuan__badge {
  padding: 1.75rem;
  text-align: center;
  border: 1px solid var(--line);
  background: var(--surface);
}

.page-about .about-sichuan__badge p {
  margin: 1rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-panda {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-sichuan__content p {
  margin: 0 0 1rem;
  color: var(--text);
}

.page-about .about-red-word {
  color: var(--red);
}

.page-about .about-blue-word {
  color: var(--blue);
}

.page-about .about-cta {
  padding: 2.5rem 0.75rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(230, 57, 70, 0.12), transparent 58%),
    var(--surface);
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
}

.page-about .about-cta__kicker {
  margin: 0 0 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46ch;
  color: var(--text);
  font-size: 0.95rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (min-width: 48rem) {
  .page-about .about-team__roles li {
    flex-direction: row;
    align-items: baseline;
    gap: 1rem;
  }

  .page-about .about-team__roles span {
    min-width: 8em;
  }

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

  .page-about .about-scale__list li {
    grid-template-columns: 9rem 1fr;
    gap: 1rem;
    align-items: baseline;
  }

  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
  }
}

@media (min-width: 64rem) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-w) 1fr;
    gap: 2rem;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 1.25rem;
    padding-top: 0.25rem;
    margin-top: 1.5rem;
    border-top: 3px solid var(--red);
  }

  .page-about .about-rail__heading {
    margin: 0 0 0.75rem;
    padding: 0 0 0.5rem 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-rail__nav {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 0.55rem;
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
    line-height: 1.3;
    color: var(--muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--ink);
    border-left-color: var(--red);
    background: linear-gradient(90deg, var(--red-soft), transparent 65%);
  }

  .page-about .about-rail__num {
    flex: 0 0 auto;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--blue);
  }

  .page-about .about-section {
    padding: 5rem 1.5rem 5.5rem 1rem;
  }

  .page-about .about-source__grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: start;
  }

  .page-about .about-sichuan__grid {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: center;
  }

  .page-about .about-cta {
    padding: 3rem 1.5rem 3rem 1rem;
  }
}