.page-about {
  --about-rail: 90px;
  --about-cut: 14px;
}

/* ---------- hero ---------- */
.page-about .about-hero {
  padding-top: calc(var(--header-h) + clamp(26px, 5vw, 58px));
  padding-bottom: clamp(44px, 7vw, 90px);
  background-image:
    radial-gradient(120% 90% at 88% -10%, rgba(53, 230, 208, 0.16), transparent 62%),
    radial-gradient(90% 80% at -5% 110%, rgba(255, 90, 31, 0.12), transparent 60%);
  background-repeat: no-repeat;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-hero__main .display {
  margin: 8px 0 clamp(16px, 2.4vw, 24px);
  transform: skewX(-3deg);
}

.page-about .about-hero__main .lede {
  max-width: 38em;
  color: rgba(245, 241, 232, 0.86);
}

.page-about .about-sign {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-top: 12px;
  max-width: 34em;
  border-top: 1px solid var(--lane-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--aqua);
}

.page-about .about-hero__rail {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-hero__rail .side-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--aqua);
}

.page-about .about-jump {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-jump li + li {
  border-top: 1px solid var(--lane);
}

.page-about .about-jump a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  color: var(--frost);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--neon);
  transform: translateX(4px);
}

.page-about .about-jump__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.06em;
}

/* ---------- chapter scaffolding ---------- */
.page-about .chapter__grid {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-about .chapter__label {
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--slate);
}

.page-about .section--dark .chapter__label,
.page-about .section--teal .chapter__label {
  color: var(--aqua);
}

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

.page-about .chapter__body h2 {
  margin-top: 0;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .chapter__body p {
  max-width: 38em;
  font-size: 16px;
  line-height: 1.78;
}

.page-about .section--paper .chapter__body p {
  color: var(--ink);
}

.page-about .section--dark .chapter__body p,
.page-about .section--teal .chapter__body p {
  color: rgba(245, 241, 232, 0.85);
}

.page-about .chapter__body a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}

.page-about .section--paper .chapter__body a { color: var(--mid-teal); }
.page-about .section--paper .chapter__body a:hover { color: var(--orange); }

/* ---------- pull statement ---------- */
.page-about .pull {
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: clamp(18px, 2.6vw, 28px);
  border-left: 3px solid var(--gold);
  background: rgba(232, 179, 74, 0.12);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .pull__text {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.3vw, 25px);
  line-height: 1.5;
  font-weight: 700;
  color: var(--ink);
}

.page-about .pull__from {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ---------- team ---------- */
.page-about .about-banner {
  margin: clamp(20px, 3vw, 30px) 0 clamp(20px, 3vw, 30px);
}

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

.page-about .team-grid {
  display: grid;
  gap: 12px;
}

.page-about .team-cell {
  padding: clamp(16px, 2.2vw, 24px);
  background: linear-gradient(150deg, rgba(15, 90, 102, 0.72), rgba(4, 34, 43, 0.72));
  border: 1px solid var(--mid-teal);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .team-cell:hover,
.page-about .team-cell:focus-within {
  transform: translateY(-2px);
  border-color: var(--neon);
}

.page-about .team-cell__role {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
  letter-spacing: 0.02em;
}

.page-about .team-cell__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  line-height: 1.1;
  color: var(--neon);
}

.page-about .team-cell__num span {
  margin-left: 4px;
  font-size: 12px;
  color: var(--aqua);
  vertical-align: super;
}

.page-about .team-cell__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.78);
}

/* ---------- process ---------- */
.page-about .sub-head {
  margin: clamp(28px, 4vw, 40px) 0 10px;
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--ink);
}

.page-about .flow {
  display: grid;
  gap: 10px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  padding: 14px 16px 16px;
  background: rgba(228, 212, 187, 0.42);
  border-top: 3px solid var(--mid-teal);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .flow__item:hover {
  border-top-color: var(--orange);
  background: rgba(228, 212, 187, 0.7);
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .flow__label {
  margin: 6px 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .flow__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- accordion ---------- */
.page-about .acc {
  margin-top: 12px;
  background: var(--sand);
  border-left: 2px solid var(--mid-teal);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .acc__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .acc__icon {
  margin-left: auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: transform 0.18s var(--ease);
}

.page-about .acc[open] .acc__icon { transform: rotate(-135deg); }

.page-about .acc__panel {
  padding: 0 18px 16px;
}

.page-about .acc__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 40em;
}

/* ---------- timeline ---------- */
.page-about .timeline {
  position: relative;
  margin-top: clamp(22px, 3.4vw, 36px);
  padding: 4px 0 4px 6px;
}

.page-about .timeline__bgwrap {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 2px;
}

.page-about .timeline__bgwrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 34, 43, 0.9), rgba(4, 34, 43, 0.94));
}

.page-about .timeline__bg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.page-about .timeline__list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 12px;
  list-style: none;
}

.page-about .tl {
  background: rgba(8, 59, 71, 0.82);
  border-left: 2px solid var(--lane-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: border-color 0.18s var(--ease);
}

.page-about .tl[open] { border-left-color: var(--neon); }

.page-about .tl__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 28px);
  letter-spacing: 0.04em;
  color: var(--neon);
}

.page-about .tl__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--frost);
}

.page-about .tl__icon {
  margin-left: auto;
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  transform: rotate(45deg);
  transition: transform 0.18s var(--ease);
}

.page-about .tl[open] .tl__icon { transform: rotate(-135deg); }

.page-about .tl__body {
  margin: 0;
  padding: 0 18px 15px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.84);
}

/* ---------- cooperation ---------- */
.page-about .coop-grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(12px, 2vw, 18px);
}

.page-about .coop-text p:first-child { margin-top: 0; }

.page-about .coop-media { margin: 0; }

.page-about .coop-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stat {
  padding: 14px 16px;
  background: var(--sand);
  border-left: 3px solid var(--orange);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  color: var(--ink);
}

.page-about .stat__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--slate);
}

/* ---------- join ---------- */
.page-about .join-paths {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .join-path {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 18px 20px;
  background: rgba(8, 59, 71, 0.66);
  border: 1px solid var(--mid-teal);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .join-path:hover,
.page-about .join-path:focus-visible {
  transform: translateY(-2px);
  border-color: var(--neon);
}

.page-about .join-path__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .join-path__t {
  font-size: 17px;
  font-weight: 700;
  color: var(--frost);
}

.page-about .join-path__a {
  margin-top: auto;
  font-size: 13px;
  color: var(--neon);
}

.page-about .join-mail {
  margin-top: clamp(20px, 3vw, 28px);
  font-size: 15px;
  color: rgba(245, 241, 232, 0.82);
}

.page-about .join-mail a {
  color: var(--neon);
  text-decoration-color: var(--orange);
}

/* ---------- focus visibility ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .page-about .team-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 760px) {
  .page-about .join-paths { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: end;
  }

  .page-about .chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 48px);
  }

  .page-about .chapter__rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding-left: 0;
    padding-top: 6px;
    border-left: 0;
    border-top: 2px solid var(--orange);
  }

  .page-about .chapter__label {
    writing-mode: vertical-rl;
    letter-spacing: 0.4em;
    font-size: 12px;
  }

  .page-about .chapter__body h2 { max-width: 22em; }

  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team-cell:nth-child(1) { grid-column: span 5; }
  .page-about .team-cell:nth-child(2) { grid-column: span 3; }
  .page-about .team-cell:nth-child(3) { grid-column: span 4; }
  .page-about .team-cell:nth-child(4) { grid-column: 4 / span 5; }

  .page-about .flow { grid-template-columns: repeat(5, minmax(0, 1fr)); }

  .page-about .coop-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .timeline__list { padding: 18px 22px; }

  .page-about .timeline__item:nth-child(2) { margin-left: 6%; }
  .page-about .timeline__item:nth-child(3) { margin-left: 12%; }
  .page-about .timeline__item:nth-child(4) { margin-left: 18%; }
  .page-about .timeline__item:nth-child(5) { margin-left: 24%; }
}

@media (min-width: 1120px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 290px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-cell,
  .page-about .join-path,
  .page-about .about-jump a,
  .page-about .flow__item,
  .page-about .acc__icon,
  .page-about .tl__icon {
    transition: none;
  }

  .page-about .team-cell:hover,
  .page-about .join-path:hover,
  .page-about .about-jump a:hover {
    transform: none;
  }
}