.page-about .about-intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .about-intro-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 7vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--c-white);
  margin: 10px 0 18px;
  font-weight: 800;
}

.page-about .about-lede {
  font-size: clamp(17px, 1.8vw, 19px);
  line-height: 1.75;
  color: var(--c-text);
}

.page-about .about-intro-copy > p {
  max-width: 64ch;
  margin: 0 0 14px;
  color: var(--c-text);
  line-height: 1.75;
}

.page-about .about-keyfacts {
  list-style: none;
  padding: 0;
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .about-keyfacts li {
  border: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 4px 4px 0 rgba(43, 69, 96, .28);
}

.page-about .about-kf-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  color: var(--c-cyan);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.page-about .about-kf-label {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.5;
}

.page-about .about-hero-frame {
  margin: 0;
  border: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-hero-frame .media-frame-caption {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-2);
  border-top: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  line-height: 1.5;
}

.page-about .about-aside h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.12;
  color: var(--c-white);
  margin: 10px 0 14px;
  font-weight: 800;
}

.page-about .about-aside p {
  color: var(--c-text-2);
  font-size: 15px;
  line-height: 1.7;
  max-width: 32ch;
  margin: 0 0 10px;
}

.page-about .about-aside p a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-aside .annotation {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-grey);
  writing-mode: vertical-rl;
}

.page-about .about-timeline-stage {
  display: grid;
  gap: 22px;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
  display: grid;
  gap: 22px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: linear-gradient(to bottom, var(--c-cyan) 0%, var(--c-line) 40%, var(--c-line) 100%);
}

.page-about .about-step {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 14px;
  width: 12px;
  height: 12px;
  background: var(--c-ink);
  border: 3px solid var(--c-cyan);
  border-radius: 50%;
  box-sizing: content-box;
}

.page-about .about-step-year {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--c-cyan);
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.2;
}

.page-about .about-step-panel {
  padding: 18px 20px;
  background: var(--c-panel);
  border: var(--bw) solid var(--c-line);
  box-shadow: 5px 5px 0 rgba(43, 69, 96, .3);
}

.page-about .about-step-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-text-2);
  margin: 0;
}

.page-about .about-step-panel h3 {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 24px);
  color: var(--c-white);
  margin: 6px 0 8px;
  line-height: 1.2;
  font-weight: 700;
}

.page-about .about-step-panel p:last-child {
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-section-head {
  max-width: 62ch;
  margin-bottom: 34px;
}

.page-about .about-section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.8vw, 42px);
  color: var(--c-white);
  line-height: 1.12;
  margin: 10px 0 12px;
  font-weight: 800;
}

.page-about .about-section-head > p:last-child {
  color: var(--c-text);
  font-size: 16px;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-team-chart {
  margin: 0;
  border: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

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

.page-about .about-team-row {
  position: relative;
  border: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  overflow: hidden;
}

.page-about .about-team-bar {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--pct, 20%);
  background: linear-gradient(90deg, rgba(73, 242, 208, .14), rgba(73, 242, 208, .02));
  border-right: 2px solid rgba(73, 242, 208, .32);
  pointer-events: none;
}

.page-about .about-team-item {
  position: relative;
  z-index: 1;
  padding: 0;
}

.page-about .about-team-item summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 16px 14px 18px;
  color: var(--c-white);
}

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

.page-about .about-team-item summary::marker {
  content: "";
}

.page-about .about-team-item summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-cyan);
  line-height: 1;
}

.page-about .about-team-item[open] summary::after {
  content: "－";
}

.page-about .about-team-item summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: -3px;
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--c-cyan);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .about-team-name {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: .02em;
  font-weight: 700;
}

.page-about .about-team-item p {
  margin: 0;
  padding: 0 18px 16px;
  color: var(--c-text);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-region-stage {
  display: grid;
  gap: 22px;
}

.page-about .about-region-figure {
  margin: 0;
  border: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .about-region-cities {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-region-city {
  border-left: 3px solid var(--c-line);
  padding: 4px 0 4px 16px;
}

.page-about .about-region-city--focus {
  border-left-color: var(--c-amber);
}

.page-about .about-region-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-text-2);
  text-transform: uppercase;
}

.page-about .about-region-city--focus .about-region-tag {
  color: var(--c-amber);
}

.page-about .about-region-city p {
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.7;
  margin: 6px 0 0;
}

.page-about .about-region-note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-2);
  line-height: 1.6;
  margin: 0;
}

.page-about .about-quality-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-q-stat {
  padding: 22px 22px 24px;
  background: var(--c-panel);
  border: var(--bw) solid var(--c-line);
  box-shadow: 5px 5px 0 rgba(43, 69, 96, .28);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-q-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.4vw, 52px);
  line-height: 1;
  color: var(--c-cyan);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about .about-q-label {
  font-size: 14px;
  color: var(--c-white);
  font-weight: 600;
  margin: 0;
  line-height: 1.5;
}

.page-about .about-q-stat > p:last-child {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.65;
  margin: 0;
}

.page-about .about-partner-stage {
  display: grid;
  gap: 22px;
}

.page-about .about-partner-stats {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .about-partner-stats li {
  padding: 16px 18px;
  border: var(--bw) solid var(--c-line);
  background: var(--c-panel);
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 4px 4px 0 rgba(43, 69, 96, .24);
}

.page-about .about-partner-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  color: var(--c-amber);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-partner-stats li > span:last-child {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.5;
}

.page-about .about-partner-note {
  font-size: 15px;
  color: var(--c-text);
  line-height: 1.75;
  margin: 0;
}

.page-about .about-partner-note a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-partner-actions {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 720px) {
  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-region-cities {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-quality-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline-stage {
    gap: 26px;
  }

  .page-about .about-track {
    padding-left: 40px;
    gap: 26px;
  }

  .page-about .about-track::before {
    left: 17px;
    width: 4px;
  }

  .page-about .about-step {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .about-step::before {
    left: -29px;
    top: 16px;
    width: 14px;
    height: 14px;
    border-width: 4px;
  }

  .page-about .about-step-year {
    font-size: 23px;
    padding-top: 16px;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr);
    gap: 32px;
  }

  .page-about .about-quality-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-partner-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-item summary,
  .page-about .about-step-panel {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --pct: 1rem;
}