.page-about {
  --ab-line: rgba(169, 214, 204, 0.2);
  --ab-line-strong: rgba(169, 214, 204, 0.44);
  position: relative;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--paper);
}

.page-about .ab-crumb {
  padding: 20px 0 0;
}

.page-about .ab-crumb .crumbs {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.page-about .ab-crumb .crumbs a {
  color: var(--graphite);
  text-decoration: none;
}

.page-about .ab-crumb .crumbs a:hover {
  color: var(--celadon);
}

.page-about .ab-crumb .crumbs [aria-current="page"] {
  color: rgba(244, 239, 228, 0.86);
}

.page-about .ab-crumb .crumbs__sep {
  margin: 0 8px;
  color: rgba(169, 214, 204, 0.4);
}

/* ---------- Hero ---------- */

.page-about .ab-hero {
  position: relative;
  padding: 40px 0 56px;
  background:
    radial-gradient(130% 90% at 100% 0%, rgba(79, 175, 155, 0.12), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(216, 162, 74, 0.06), transparent 60%),
    var(--ink);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: 36px;
}

.page-about .ab-hero__main {
  position: relative;
  padding-left: 24px;
}

.page-about .ab-hero__vert {
  position: absolute;
  left: 0;
  top: 2px;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  line-height: 1;
  color: var(--celadon);
}

.page-about .ab-hero__main .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  margin: 0 0 14px;
}

.page-about .ab-hero__title {
  margin: 0 0 22px;
  font-size: clamp(32px, 6.4vw, 66px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-hero__lead {
  max-width: 34em;
  margin: 0 0 32px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.8);
}

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

.page-about .ab-stat {
  background: var(--ink);
  padding: 14px 16px;
}

.page-about .ab-stat dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--graphite);
}

.page-about .ab-stat dd {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__aside {
  position: relative;
}

.page-about .ab-frame {
  position: relative;
  padding: 10px;
  border: 1px solid var(--ab-line-strong);
  background: var(--ink-2);
}

.page-about .ab-frame::before,
.page-about .ab-frame::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--celadon);
  pointer-events: none;
}

.page-about .ab-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .ab-frame .figure {
  margin: 0;
}

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

/* ---------- Section base ---------- */

.page-about .ab-sec {
  position: relative;
  padding: 56px 0;
}

.page-about .ab-sec h2 {
  margin: 10px 0 0;
  font-size: clamp(25px, 4vw, 38px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.005em;
}

.page-about .ab-sec__head {
  max-width: 720px;
  margin-bottom: 36px;
}

.page-about .ab-sec__head .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  margin: 0;
}

.page-about .ab-sec__lead {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .prose {
  max-width: 36em;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.78);
}

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

/* ---------- Split ---------- */

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

.page-about .ab-split__main h2 {
  margin: 10px 0 20px;
}

.page-about .ab-split__main .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  margin: 0;
}

.page-about .ab-note {
  border: 1px solid var(--ab-line);
  padding: 20px;
  background: linear-gradient(180deg, rgba(20, 41, 63, 0.9), rgba(11, 26, 43, 0.9));
}

.page-about .ab-note__k {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--celadon);
}

.page-about .ab-note__list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.page-about .ab-note__list li {
  padding: 9px 0;
  border-bottom: 1px dashed var(--ab-line);
  font-size: 15px;
  letter-spacing: 0.02em;
}

.page-about .ab-note__list li:last-child {
  border-bottom: 0;
}

.page-about .ab-note__f {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- Steps ---------- */

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-step {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--ab-line);
  background: var(--ink-2);
  transition: transform 0.15s var(--ease), border-color 0.15s var(--ease);
}

.page-about .ab-step:hover {
  transform: translateY(-2px);
  border-color: var(--celadon);
}

.page-about .ab-step__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--amber);
}

.page-about .ab-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.45;
  font-weight: 700;
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.7);
}

.page-about .ab-linkline {
  margin: 26px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.72);
}

.page-about .ab-linkline a {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 175, 155, 0.5);
  padding-bottom: 1px;
  transition: color 0.15s var(--ease), border-color 0.15s var(--ease);
}

.page-about .ab-linkline a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* ---------- Theme band ---------- */

.page-about .ab-band {
  background: var(--paper);
  color: var(--ink);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-band__inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 36px 0;
}

.page-about .ab-band__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--celadon-deep);
}

.page-about .ab-band__v {
  margin: 0;
  font-size: clamp(20px, 3.2vw, 30px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.005em;
}

/* ---------- Version timeline ---------- */

.page-about .ab-figure-wide {
  margin: 0 0 32px;
}

.page-about .ab-figure-wide img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--ab-line);
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--graphite);
}

.page-about .ab-tl__index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 32px;
  padding: 0;
}

.page-about .ab-tl__index a {
  display: inline-block;
  padding: 7px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--ab-line-strong);
  transition: color 0.15s var(--ease), background 0.15s var(--ease), border-color 0.15s var(--ease);
}

.page-about .ab-tl__index a:hover,
.page-about .ab-tl__index a:focus-visible {
  color: var(--ink);
  background: var(--celadon);
  border-color: var(--celadon);
}

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

.page-about .ab-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 34px;
  scroll-margin-top: 90px;
}

.page-about .ab-tl__item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(79, 175, 155, 0.66), rgba(79, 175, 155, 0.07));
}

.page-about .ab-tl__mark {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 2px;
}

.page-about .ab-tl__dot {
  flex: none;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--celadon);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(79, 175, 155, 0.13);
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--celadon);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl__body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 700;
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 40em;
  font-size: 14.8px;
  line-height: 1.85;
  color: rgba(244, 239, 228, 0.72);
}

.page-about .ab-tl__tag {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--amber);
  vertical-align: middle;
}

/* ---------- Team ---------- */

.page-about .ab-team__grid {
  display: grid;
  gap: 32px;
  margin-bottom: 44px;
}

.page-about .ab-team__text .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  margin: 0;
}

.page-about .ab-team__text h2 {
  margin: 10px 0 20px;
}

.page-about .ab-team__visual .figure {
  margin: 0;
}

.page-about .ab-bars {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding-top: 10px;
}

.page-about .ab-bar {
  position: relative;
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  outline: none;
}

.page-about .ab-bar--edit {
  flex-grow: 11;
}

.page-about .ab-bar--exp {
  flex-grow: 8;
}

.page-about .ab-bar--ops {
  flex-grow: 7;
}

.page-about .ab-bar__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-bar__col {
  display: block;
  height: 82px;
  border: 1px solid rgba(169, 214, 204, 0.32);
  background:
    repeating-linear-gradient(135deg, rgba(11, 26, 43, 0.14) 0 3px, transparent 3px 9px),
    linear-gradient(180deg, var(--celadon) 0%, var(--celadon-deep) 100%);
  transition: filter 0.15s var(--ease), transform 0.15s var(--ease);
}

.page-about .ab-bar--exp .ab-bar__col {
  background:
    repeating-linear-gradient(135deg, rgba(11, 26, 43, 0.14) 0 3px, transparent 3px 9px),
    linear-gradient(180deg, var(--celadon-deep) 0%, #245F55 100%);
}

.page-about .ab-bar--ops .ab-bar__col {
  background:
    repeating-linear-gradient(135deg, rgba(11, 26, 43, 0.14) 0 3px, transparent 3px 9px),
    linear-gradient(180deg, #3C8E7E 0%, #28685C 100%);
}

.page-about .ab-bar:hover .ab-bar__col,
.page-about .ab-bar:focus-visible .ab-bar__col {
  filter: brightness(1.12);
}

.page-about .ab-bar__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(244, 239, 228, 0.82);
}

.page-about .ab-bar__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 6px);
  z-index: 3;
  min-width: 128px;
  max-width: 220px;
  padding: 7px 10px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--celadon);
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .ab-bar:hover .ab-bar__tip,
.page-about .ab-bar:focus-within .ab-bar__tip,
.page-about .ab-bar:focus-visible .ab-bar__tip {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Six directions ---------- */

.page-about .ab-dirs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-dir {
  position: relative;
  background: var(--ink);
  padding: 22px 18px 24px;
  transition: background 0.18s var(--ease);
}

.page-about .ab-dir:hover {
  background: var(--ink-2);
}

.page-about .ab-dir__num {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
  border: 1px solid rgba(192, 82, 63, 0.5);
}

.page-about .ab-dir__name {
  margin: 0 0 8px;
  font-size: 16.5px;
  line-height: 1.4;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .ab-dir__text {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.68);
}

/* ---------- Rhythm ---------- */

.page-about .ab-rhythm {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-rhythm__card {
  padding: 20px 18px 22px;
  border: 1px solid var(--ab-line);
  background: linear-gradient(180deg, rgba(20, 41, 63, 0.72), rgba(11, 26, 43, 0.72));
}

.page-about .ab-rhythm__k {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--graphite);
}

.page-about .ab-rhythm__v {
  margin: 0 0 10px;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-rhythm__t {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.68);
}

/* ---------- Close ---------- */

.page-about .ab-close {
  padding-bottom: 72px;
}

.page-about .ab-close__panel {
  position: relative;
  padding: 32px 24px 34px;
  border: 1px solid var(--ab-line-strong);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(79, 175, 155, 0.13), transparent 62%),
    var(--ink-2);
}

.page-about .ab-close__panel .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--celadon);
  margin: 0;
}

.page-about .ab-close__panel h2 {
  margin: 10px 0 16px;
}

.page-about .ab-close__panel .prose {
  max-width: 38em;
  margin-bottom: 26px;
}

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

/* ---------- Media queries ---------- */

@media (min-width: 620px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-hero__lead {
    font-size: 17px;
  }

  .page-about .ab-bars {
    gap: 16px;
  }

  .page-about .ab-bar__col {
    height: 104px;
  }

  .page-about .ab-close__panel {
    padding: 44px 40px 46px;
  }
}

@media (min-width: 760px) {
  .page-about .ab-hero {
    padding: 60px 0 72px;
  }

  .page-about .ab-hero__main {
    padding-left: 36px;
  }

  .page-about .ab-sec {
    padding: 76px 0;
  }

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

  .page-about .ab-step + .ab-step {
    margin-left: -1px;
  }

  .page-about .ab-band__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    padding: 42px 0;
  }

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

  .page-about .ab-dir {
    padding: 26px 22px 28px;
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) 286px;
    gap: 56px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1fr) 380px;
    gap: 56px;
    align-items: start;
    margin-bottom: 52px;
  }

  .page-about .ab-tl__item {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 36px;
    padding-bottom: 42px;
  }

  .page-about .ab-tl__body h3 {
    font-size: 19px;
  }

  .page-about .ab-tl__body p {
    font-size: 15.2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-step,
  .page-about .ab-bar__col,
  .page-about .ab-bar__tip,
  .page-about .ab-tl__index a,
  .page-about .ab-dir,
  .page-about .ab-linkline a {
    transition-duration: 0.12s;
  }

  .page-about .ab-step:hover {
    transform: none;
  }
}
<<<END>>>