.page-about {
  --about-h1: clamp(2.1rem, 5.2vw, 3.6rem);
  --about-h2: clamp(1.3rem, 2.6vw, 1.7rem);
  position: relative;
  overflow-x: clip;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.75;
}

.page-about .breadcrumb {
  padding-block: calc(var(--header-h) + 12px) 20px;
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-bottom-color: transparent;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  padding-bottom: clamp(32px, 5vw, 64px);
}

.page-about .about-hero-inner {
  display: grid;
  gap: 18px;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--about-h1);
  line-height: 1.16;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .about-lead {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-16);
  color: var(--muted);
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 14px 0 0;
  border-top: var(--line);
}

.page-about .about-fact {
  padding: 14px 14px 14px 0;
  border-bottom: var(--line);
}

.page-about .about-fact:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-fact dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.2;
}

/* ---------- Chapter shell ---------- */
.page-about .about-chapter {
  padding-block: clamp(40px, 6vw, 80px);
  border-top: var(--line);
}

.page-about .about-ch-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding-bottom: 18px;
  margin-bottom: 28px;
  border-bottom: var(--line);
}

.page-about .about-ch-num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-ch-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--about-h2);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-ch-en {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.72;
}

/* ---------- 01 Origin ---------- */
.page-about .about-origin {
  background: var(--ink-deep);
}

.page-about .about-origin-claim {
  margin: 0 0 26px;
  max-width: 22em;
  font-family: var(--font-display);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-origin-body {
  display: grid;
  gap: 28px;
}

.page-about .about-origin-text p {
  margin: 0 0 16px;
  max-width: 34em;
  color: var(--muted);
}

.page-about .about-origin-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin-figure {
  margin: 0;
}

.page-about .media-frame {
  overflow: hidden;
  border: var(--line);
  background: var(--panel);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

.page-about .media-caption {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 02 Timeline ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: var(--line);
}

.page-about .about-node {
  position: relative;
  padding: 0 0 30px 30px;
}

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

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  background: var(--ink);
  border: 1px solid var(--grid-line);
  transition: background var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .about-node-year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color var(--speed) var(--ease);
}

.page-about .about-node-tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: var(--line);
}

.page-about .about-node-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-node-text {
  margin: 0;
  max-width: 42em;
  font-size: var(--fs-14);
  color: var(--muted);
}

@media (hover: hover) {
  .page-about .about-node:hover::before {
    background: var(--amber);
    border-color: var(--amber);
  }

  .page-about .about-node:hover .about-node-year {
    color: var(--amber);
  }
}

/* ---------- 03 Team ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 32px;
}

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

.page-about .about-team-chart {
  position: relative;
  width: min(220px, 62vw);
  margin: 0 auto;
}

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

.page-about .about-team-total {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.page-about .about-team-total strong {
  font-family: var(--font-mono);
  font-size: var(--fs-44);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-team-total span {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-team-figure {
  margin: 0;
}

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

.page-about .about-team-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 16px;
  padding: 18px 0;
  border-top: var(--line);
}

.page-about .about-team-item:last-child {
  border-bottom: var(--line);
}

.page-about .about-team-key {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-team-key::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  vertical-align: 2px;
  background: var(--amber);
}

.page-about .about-team-item:nth-child(2) .about-team-key::before {
  background: var(--cyan);
}

.page-about .about-team-item:nth-child(3) .about-team-key::before {
  background: #5A6E8C;
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .about-team-item:nth-child(2) .about-team-num {
  color: var(--cyan);
}

.page-about .about-team-item:nth-child(3) .about-team-num {
  color: #5A6E8C;
}

.page-about .about-team-item p {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  max-width: 40em;
  font-size: var(--fs-14);
  color: var(--muted);
}

/* ---------- 04 QC ---------- */
.page-about .about-qc-flow {
  border-bottom: var(--line);
}

.page-about .about-qc-step {
  padding: 22px 0;
  border-top: var(--line);
}

.page-about .about-qc-idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-qc-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
}

.page-about .about-qc-text {
  margin: 0;
  max-width: 30em;
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-qc-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: var(--line);
}

.page-about .about-qc-stat {
  padding: 10px 14px 14px 0;
  border-bottom: var(--line);
}

.page-about .about-qc-stat:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .about-qc-stat dt {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-qc-stat dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.page-about .about-qc-value {
  color: var(--amber);
}

/* ---------- 05 Fields ---------- */
.page-about .about-fields-layout {
  display: grid;
  gap: 32px;
}

.page-about .about-fields-big {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--muted);
}

.page-about .about-fields-big span {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-72);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

.page-about .about-fields-sub {
  margin: 0 0 12px;
  font-size: var(--fs-16);
  color: var(--text);
}

.page-about .about-fields-dict {
  margin: 0 0 18px;
  font-size: var(--fs-14);
  color: var(--muted);
}

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

.page-about .about-field {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 12px;
  padding: 13px 0;
  border-bottom: var(--line);
}

.page-about .about-field-code {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan);
  align-self: center;
}

.page-about .about-field-name {
  font-size: var(--fs-16);
  font-weight: 600;
}

.page-about .about-field-desc {
  grid-column: 2;
  margin: 0;
  font-size: var(--fs-14);
  color: var(--muted);
}

/* ---------- 06 Clients ---------- */
.page-about .about-clients-figure {
  margin: 0 0 28px;
}

.page-about .about-clients-figure .media-frame {
  max-height: 240px;
}

.page-about .about-clients-figure img {
  height: 100%;
}

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

.page-about .about-client {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 20px 0;
  border-top: var(--line);
}

.page-about .about-client:last-child {
  border-bottom: var(--line);
}

.page-about .about-client-idx {
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-client-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
}

.page-about .about-client-body p {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-client-metric {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  margin: 10px 0 0;
}

.page-about .about-client-num {
  font-family: var(--font-mono);
  font-size: var(--fs-44);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .about-client-unit {
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 07 Partners ---------- */
.page-about .about-partners-lead {
  margin: 0;
  max-width: 46em;
  color: var(--muted);
}

.page-about .about-partner-track {
  display: flex;
  list-style: none;
  margin: 24px 0 0;
  padding: 0 0 10px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--grid-line) transparent;
}

.page-about .about-partner {
  flex: 0 0 auto;
  min-width: 190px;
  padding: 18px 20px;
  border: var(--line);
  border-left: 0;
}

.page-about .about-partner:first-child {
  border-left: var(--line);
}

.page-about .about-partner-name {
  display: block;
  font-size: var(--fs-16);
  font-weight: 600;
  margin-bottom: 6px;
}

.page-about .about-partner-note {
  display: block;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- Next ---------- */
.page-about .about-next {
  padding-block: clamp(40px, 6vw, 72px);
  border-top: var(--line);
  background: var(--ink-deep);
}

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

.page-about .about-next h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--about-h2);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-next p {
  margin: 0;
  max-width: 44em;
  color: var(--muted);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* ---------- Responsive ---------- */
@media (min-width: 720px) {
  .page-about .about-field {
    grid-template-columns: 56px 150px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-field-desc {
    grid-column: 3;
  }

  .page-about .about-qc-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 20px;
  }

  .page-about .about-qc-stat {
    border-bottom: 0;
    padding-right: 0;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding: 18px 20px;
    border-bottom: 0;
    border-left: var(--line);
  }

  .page-about .about-fact:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-origin-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.32fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    column-gap: 32px;
    padding: 0 0 36px 36px;
  }

  .page-about .about-node-year {
    margin-bottom: 0;
    font-size: var(--fs-28);
    line-height: 1.1;
  }

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

  .page-about .about-qc-step {
    padding: 26px 24px;
  }

  .page-about .about-qc-step + .about-qc-step {
    border-left: var(--line);
  }

  .page-about .about-qc-step:first-child {
    padding-left: 0;
  }

  .page-about .about-qc-step:last-child {
    padding-right: 0;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-team-chart {
    margin: 0;
  }

  .page-about .about-fields-layout {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-client {
    grid-template-columns: 44px minmax(0, 1fr) 210px;
    column-gap: 24px;
    align-items: center;
    padding: 22px 0;
  }

  .page-about .about-client-metric {
    grid-column: 3;
    grid-row: 1;
    justify-content: flex-end;
    text-align: right;
    margin: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-origin-claim {
    font-size: var(--fs-44);
    line-height: 1.22;
    max-width: 20em;
  }

  .page-about .about-partner {
    min-width: 220px;
    padding: 22px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node::before,
  .page-about .about-node-year {
    transition: none;
  }
}
<<<END>>>