.page-about {
  overflow-x: clip;
  background:
    radial-gradient(circle at 82% 4%, rgba(198, 255, 61, 0.08), transparent 30rem),
    var(--ink);
}

.page-about .about-hero {
  padding: clamp(20px, 4vw, 44px) 0 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__top {
  display: grid;
  gap: 28px;
  align-items: end;
}

.page-about .about-hero__copy h1 {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: clamp(4rem, 15vw, 8.6rem);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.06em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-lead {
  max-width: 48ch;
  margin: 0;
  color: var(--paper);
  font-size: clamp(1rem, 1.5vw, 1.18rem);
  line-height: 1.8;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 14px;
  max-width: 360px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-coord {
  margin: 0;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.page-about .about-role {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-narrow);
  font-size: 0.95rem;
  line-height: 1.65;
  letter-spacing: 0.02em;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about .about-banner {
  position: relative;
  margin: clamp(28px, 5vw, 56px) 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.72);
}

.page-about .about-banner__cap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.5;
}

.page-about .about-section {
  padding: clamp(44px, 7vw, 84px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__head {
  display: grid;
  gap: 14px;
  max-width: 74rem;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4.2vw, 3.1rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-intro {
  max-width: 66ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

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

.page-about .about-brand__text {
  display: grid;
  gap: 1em;
}

.page-about .about-brand__text p {
  margin: 0;
}

.page-about .about-keymap {
  position: relative;
  align-self: start;
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-keymap img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.68) brightness(0.8);
}

.page-about .about-keymap__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 1;
  padding: 6px 10px;
  background: var(--lime);
  color: var(--on-lime);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-keymap__cap {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-top: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.5;
}

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

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 1px;
  background: var(--lime);
  transition: width 0.3s var(--ease);
}

.page-about .about-timeline__item:hover::after,
.page-about .about-timeline__item:focus-within::after {
  width: 100%;
}

.page-about .about-year {
  position: relative;
  align-self: start;
  padding-left: 16px;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.page-about .about-year::before {
  content: "";
  position: absolute;
  top: 0.5em;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--lime);
  transform: rotate(45deg);
  transition: background 0.2s var(--ease);
}

.page-about .about-timeline__item:hover .about-year,
.page-about .about-timeline__item:focus-within .about-year {
  color: var(--snow);
}

.page-about .about-timeline__item:hover .about-year::before,
.page-about .about-timeline__item:focus-within .about-year::before {
  background: var(--orange);
}

.page-about .about-stage__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-serif);
  font-size: 1.28rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-stage__body {
  max-width: 60ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.page-about .about-stage__meta {
  display: inline-block;
  margin-top: 0.7rem;
  padding: 3px 8px;
  border: 1px solid var(--line);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.4;
}

.page-about .about-flow-panel {
  position: relative;
  padding: clamp(20px, 4vw, 42px);
  border: 1px solid var(--line);
  background: linear-gradient(145deg, var(--ink-2), var(--ink));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-flow {
  position: relative;
  display: grid;
  gap: 28px;
}

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

.page-about .about-flow__col + .about-flow__col {
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.page-about .about-flow__label {
  display: inline-flex;
  gap: 8px;
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-flow__col:last-child .about-flow__label {
  color: var(--lime);
}

.page-about .about-flow__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__list li {
  position: relative;
  padding-left: 20px;
  color: var(--paper);
  font-size: 0.95rem;
  line-height: 1.65;
}

.page-about .about-flow__list li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1.4;
}

.page-about .about-flow__hint {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.65;
}

.page-about .about-details {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--lime);
  font-family: var(--font-narrow);
  font-size: 0.95rem;
  line-height: 1.5;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-details summary::after {
  content: "+";
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  line-height: 1;
}

.page-about .about-details[open] summary::after {
  content: "−";
}

.page-about .about-details ol {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .about-details ol li::marker {
  color: var(--lime);
  font-family: var(--font-mono);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 32px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-stat {
  padding: 18px 16px;
  background: var(--ink-2);
}

.page-about .about-stat__num {
  display: block;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-family: var(--font-narrow);
  font-size: 0.76rem;
  line-height: 1.5;
}

.page-about .about-team-layout {
  display: grid;
  gap: 28px;
}

.page-about .about-team-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  padding: 20px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-team-card__no {
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-team-card__title {
  margin: 8px 0 10px;
  font-family: var(--font-serif);
  font-size: 1.28rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-team-card__body {
  margin: 0;
  color: var(--paper);
  font-size: 0.93rem;
  line-height: 1.7;
}

.page-about .about-team-card .about-details {
  margin-top: 14px;
  padding-top: 12px;
}

.page-about .about-team-card .about-details summary {
  font-size: 0.83rem;
}

.page-about .about-team-card .about-details p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.page-about .about-team-figure {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.76);
}

.page-about .about-team-figure__cap {
  padding-top: 12px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.65;
}

.page-about .about-coop {
  display: grid;
  gap: 24px;
}

.page-about .about-source {
  padding-top: 16px;
  border-top: 2px solid var(--lime);
}

.page-about .about-source:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-source:nth-child(3) {
  border-top-color: var(--lime-dim);
}

.page-about .about-source__no {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.page-about .about-source__title {
  margin: 8px 0 10px;
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-source__body {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.75;
}

.page-about .about-coop__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  margin-top: 32px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-coop__metric {
  flex: 1 1 160px;
  padding: 16px;
  background: var(--ink-2);
}

.page-about .about-coop__metric-num {
  display: block;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 1.28rem;
  font-weight: 700;
  line-height: 1.2;
}

.page-about .about-coop__metric-label {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-family: var(--font-narrow);
  font-size: 0.75rem;
  line-height: 1.45;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 22px 0 0;
}

.page-about .about-links a {
  color: var(--lime);
  font-family: var(--font-narrow);
  font-size: 0.89rem;
  line-height: 1.5;
  text-decoration: none;
  border-bottom: 1px solid var(--lime);
}

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

.page-about .about-region {
  display: grid;
  gap: 32px;
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--ink-2), var(--ink-3));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-region__num {
  margin: 0;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: clamp(4rem, 13vw, 8rem);
  font-weight: 700;
  line-height: 0.84;
  letter-spacing: -0.07em;
}

.page-about .about-region__unit {
  margin-left: 0.08em;
  color: var(--paper);
  font-size: 0.32em;
  letter-spacing: 0;
}

.page-about .about-region__label {
  display: block;
  margin: 12px 0 0;
  color: var(--muted);
  font-family: var(--font-narrow);
  font-size: 0.78rem;
  line-height: 1.45;
}

.page-about .about-region__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-region__value {
  display: block;
  margin-top: 5px;
  color: var(--paper);
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.45;
}

.page-about .about-region__aside {
  align-self: center;
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.page-about .about-region__aside p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-projects {
  border-top: 1px solid var(--line);
}

.page-about .about-project {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-project__no {
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1.6;
}

.page-about .about-project__title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-project__body {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.75;
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(198, 255, 61, 0.08), transparent 42%),
    var(--ink-2);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-cta__contact {
  max-width: 72ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.8;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 28px;
    padding: 28px 0;
  }

  .page-about .about-year {
    font-size: 1.55rem;
  }

  .page-about .about-coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-project {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__top {
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.55fr);
    gap: 48px;
  }

  .page-about .about-hero__aside {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 4px 24px;
  }

  .page-about .about-brand {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 56px;
  }

  .page-about .about-flow__col + .about-flow__col {
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-flow::before {
    content: "";
    position: absolute;
    top: -10%;
    bottom: -10%;
    left: 50%;
    width: 1px;
    background: var(--line);
    transform: rotate(8deg);
    transform-origin: top;
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-region__aside {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 4px 28px;
  }
}