.page-about {
  --about-line: rgba(216, 222, 229, 0.14);
  --about-muted: rgba(247, 243, 234, 0.68);
  --about-tone: var(--moss);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .breadcrumb {
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
}

.page-about .breadcrumb li {
  color: var(--stone);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--stone);
  opacity: 0.6;
}

.page-about .breadcrumb a {
  color: var(--about-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}

.page-about .eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.page-about .btn--primary {
  background: var(--orange);
  border: 1px solid var(--orange);
  color: var(--ink);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .btn--ghost {
  background: transparent;
  border: 1px solid var(--line-cyan);
  color: var(--paper);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ---------- hero ---------- */
.about-hero {
  padding-block: clamp(24px, 4vw, 40px) clamp(48px, 8vw, 96px);
}

.about-hero__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
}

.about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.2vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .lede {
  max-width: 34em;
  margin: 22px 0 0;
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.8;
  color: var(--about-muted);
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.about-hero__facts {
  margin: 0;
  display: grid;
  align-content: start;
  border-top: 1px solid var(--about-line);
}

.about-hero__facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-block: 15px;
  border-bottom: 1px solid var(--about-line);
}

.about-hero__facts dt {
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  letter-spacing: 0.1em;
  color: var(--about-muted);
}

.about-hero__facts dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--paper);
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- chapter frame ---------- */
.page-about .chapter {
  padding-block: clamp(44px, 7vw, 88px);
  border-top: 1px solid var(--about-line);
}

.page-about .ch--moss {
  --about-tone: var(--moss);
}

.page-about .ch--clay {
  --about-tone: var(--clay);
}

.page-about .ch--stone {
  --about-tone: var(--stone);
}

.chapter-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(20px, 3.5vw, 36px);
}

.chapter-num {
  font-family: var(--font-serif);
  font-size: clamp(38px, 6.4vw, 60px);
  line-height: 0.9;
  color: var(--about-tone);
}

.chapter-rule {
  flex: 1 1 auto;
  max-width: 120px;
  height: 2px;
  background: linear-gradient(90deg, var(--about-tone), transparent);
}

.chapter-tag {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  letter-spacing: 0.24em;
  color: var(--about-muted);
  white-space: nowrap;
}

.page-about .chapter h2 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.015em;
}

.chapter-intro {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 40em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .prose p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--about-muted);
}

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

.chapter-body {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

/* ---------- media ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--deep);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

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

.page-about .media__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--about-muted);
}

.about-figure {
  align-self: start;
}

/* ---------- pull quote ---------- */
.page-about .pull {
  margin: clamp(28px, 5vw, 56px) 0 0;
  padding-left: 20px;
  border-left: 2px solid var(--cyan);
}

.page-about .pull p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.55;
  color: var(--paper);
}

.page-about .pull cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-style: normal;
  letter-spacing: 0.16em;
  color: var(--about-muted);
}

/* ---------- content lines ---------- */
.lines {
  margin: 0;
  padding: 0;
  list-style: none;
}

.line {
  display: grid;
  gap: 12px;
  padding-block: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--about-line);
}

.line:last-child {
  border-bottom: 1px solid var(--about-line);
}

.line-no {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.12em;
  color: var(--about-tone);
}

.line-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 700;
  letter-spacing: 0.005em;
}

.line-body p {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-muted);
}

.line-link {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.line-link::after {
  content: "→";
  transition: transform var(--dur) var(--ease);
}

.line-link:hover,
.line-link:focus-visible {
  border-bottom-color: var(--cyan);
}

.line-link:hover::after,
.line-link:focus-visible::after {
  transform: translateX(4px);
}

/* ---------- steps ---------- */
.steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding-block: 16px;
  border-bottom: 1px solid var(--about-line);
}

.step:first-child {
  border-top: 1px solid var(--about-line);
}

.step-no {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--orange);
  padding-top: 3px;
}

.step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-18);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.step p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- details ---------- */
.pull-more {
  margin-top: clamp(24px, 4vw, 40px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: var(--deep);
}

.pull-more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
  color: var(--cyan);
  transition: background var(--dur) var(--ease);
}

.pull-more summary::-webkit-details-marker {
  display: none;
}

.pull-more summary:hover {
  background: rgba(45, 226, 230, 0.07);
}

.pull-more[open] summary {
  border-bottom: 1px solid var(--about-line);
}

.pull-more__hint {
  color: var(--about-muted);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
}

.pull-more__body {
  padding: 18px;
}

.pull-more__body p {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--about-muted);
}

/* ---------- timeline ---------- */
.tl-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding: 0;
  list-style: none;
}

.year-jump a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--paper);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.year-jump a:hover,
.year-jump a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tl {
  position: relative;
  margin-left: 6px;
  padding: 0 0 28px 26px;
  border-left: 1px solid var(--about-line);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.tl:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.tl::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--about-tone);
}

.tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--about-tone);
}

.tl-body h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 700;
}

.tl-body p {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-muted);
}

/* ---------- gauges ---------- */
.gauges {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.gauge {
  background: var(--deep);
  padding: clamp(18px, 3vw, 26px);
  transition: background var(--dur) var(--ease);
}

.gauge:hover,
.gauge:focus-within {
  background: rgba(45, 226, 230, 0.08);
}

.gauge__num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.gauge__num small {
  font-family: var(--font-body);
  font-size: var(--fs-14);
  font-weight: 400;
  color: var(--cyan);
}

.gauge__label {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  letter-spacing: 0.12em;
  color: var(--about-muted);
}

.gauge__bar {
  display: block;
  height: 10px;
  margin-top: 14px;
  background: repeating-linear-gradient(
    90deg,
    var(--about-tone) 0 2px,
    transparent 2px 10px
  );
  opacity: 0.75;
}

.gauge__note {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--about-muted);
  transition: color var(--dur) var(--ease);
}

.gauge:hover .gauge__note,
.gauge:focus-within .gauge__note {
  color: var(--paper);
}

.about-figure--wide {
  margin-top: clamp(28px, 5vw, 48px);
}

/* ---------- partners ---------- */
.partner-grid {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.partner {
  background: var(--deep);
  padding: clamp(20px, 3vw, 32px);
}

.partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 700;
}

.partner p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-muted);
}

.values {
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.value {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--about-line);
}

.value__mark {
  font-family: var(--font-serif);
  font-size: var(--fs-18);
  color: var(--clay);
  line-height: 1.5;
}

.value p {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-muted);
}

.about-cta {
  margin-top: clamp(36px, 6vw, 64px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(45, 226, 230, 0.09), rgba(255, 107, 44, 0.07));
  display: grid;
  gap: 22px;
}

.about-cta h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  line-height: 1.3;
}

.about-cta p {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-muted);
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- responsive ---------- */
@media (min-width: 760px) {
  .gauges {
    grid-template-columns: repeat(2, 1fr);
  }

  .partner-grid {
    grid-template-columns: 1fr 1fr;
  }

  .tl {
    display: grid;
    grid-template-columns: 96px 1fr;
    gap: 20px;
    padding-left: 30px;
  }

  .tl-year {
    line-height: 1.2;
  }

  .tl-body h3 {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .about-hero__grid {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: start;
  }

  .chapter-body--split {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .line {
    grid-template-columns: 56px 1fr auto;
    gap: 28px;
    align-items: start;
  }

  .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 1200px) {
  .about-hero__grid {
    grid-template-columns: 1.5fr 0.5fr;
    gap: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}