.page-about {
  color: var(--mist);
  background:
    radial-gradient(900px 520px at 84% -12%, rgba(53, 240, 208, 0.10), transparent 70%),
    radial-gradient(700px 420px at 4% 34%, rgba(255, 107, 53, 0.07), transparent 72%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 55%, var(--ink) 100%);
  padding-bottom: clamp(48px, 8vw, 104px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 30px);
  padding-top: clamp(16px, 3vw, 26px);
}

.page-about a {
  color: inherit;
}

/* ---------- hero ---------- */
.page-about .about-hero {
  padding: clamp(8px, 2vw, 20px) 0 clamp(26px, 5vw, 52px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  width: 36px;
  height: 1px;
  background: var(--cyan);
  flex: none;
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  max-width: 52ch;
  font-size: clamp(1rem, 2.1vw, 1.12rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-hero__stat-num {
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-hero__stat-label {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- index ---------- */
.page-about .about-index {
  align-self: start;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(12px);
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-index__list {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-index__item + .about-index__item {
  border-top: 1px solid var(--line);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  text-decoration: none;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.4;
  transition: color 0.25s var(--ease);
}

.page-about .about-index__num {
  flex: none;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate);
  transition: color 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  outline: none;
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--orange);
}

.page-about .about-index__cta {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 53, 0.45);
  padding-bottom: 3px;
}

.page-about .about-index__cta:hover,
.page-about .about-index__cta:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  outline: none;
}

/* ---------- chapter entries ---------- */
.page-about .about-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: clamp(30px, 6vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-entry__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-entry__num {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--orange);
  flex: none;
}

.page-about .about-entry__line {
  flex: 1 1 auto;
  height: 1px;
  background: var(--line-strong);
}

.page-about .about-entry__title {
  margin: 0 0 clamp(12px, 2vw, 18px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4.2vw, 2.25rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-entry__lede {
  margin: 0 0 16px;
  font-size: clamp(1rem, 2vw, 1.08rem);
  line-height: 1.78;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .about-entry__body p {
  margin: 0 0 14px;
  max-width: 64ch;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-entry__next {
  margin-top: 18px;
}

.page-about .about-inline-link {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 208, 0.35);
  padding-bottom: 3px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--orange);
  border-bottom-color: rgba(255, 107, 53, 0.6);
  outline: none;
}

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

/* ---------- split ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 40px);
  align-items: start;
}

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

/* ---------- figures ---------- */
.page-about .about-figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  object-fit: cover;
  background: var(--trench);
  filter: saturate(0.88) contrast(1.04);
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 10px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-figure--band {
  margin: clamp(22px, 3.6vw, 36px) 0 0;
}

/* ---------- principles ---------- */
.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  padding: 20px 0 22px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-principle__num {
  display: block;
  margin-bottom: 8px;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-principle__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.6vw, 1.35rem);
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-about .about-principle p {
  margin: 0;
  max-width: 40ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- timeline ---------- */
.page-about .about-track-wrap {
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 4px 0;
}

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

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

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  position: relative;
  padding: 16px 0 18px 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 23px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--slate);
}

.page-about .about-timeline__item:nth-child(4)::before {
  background: var(--cyan);
}

.page-about .about-timeline__item:last-child::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.16);
}

.page-about .about-timeline__year {
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-timeline__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.06rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- matrix ---------- */
.page-about .about-matrix {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(16px, 2.6vw, 26px);
}

.page-about .about-matrix__cell {
  position: relative;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 48, 79, 0.72), rgba(11, 27, 48, 0.55));
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-matrix__cell:hover,
.page-about .about-matrix__cell:focus-visible,
.page-about .about-matrix__cell:focus-within {
  border-color: rgba(53, 240, 208, 0.42);
  outline: none;
  transform: translateY(-2px);
}

.page-about .about-matrix__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 8px;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 3px;
}

.page-about .about-matrix__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  color: var(--paper);
}

.page-about .about-matrix__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--mist);
}

.page-about .about-matrix__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--slate);
  transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .about-matrix__cell:hover .about-matrix__more,
.page-about .about-matrix__cell:focus-visible .about-matrix__more,
.page-about .about-matrix__cell:focus-within .about-matrix__more {
  max-height: 140px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- quote ---------- */
.page-about .about-quote {
  margin: clamp(16px, 2.6vw, 24px) 0;
  padding: clamp(16px, 3vw, 24px);
  border-radius: var(--radius);
  background: var(--glass-strong);
  border-left: 2px solid var(--amber);
}

.page-about .about-quote__mark {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  line-height: 0.8;
  color: var(--amber);
}

.page-about .about-quote__text {
  margin: 8px 0 10px;
  font-size: clamp(0.98rem, 2vw, 1.06rem);
  line-height: 1.8;
  color: var(--paper);
  max-width: 42ch;
}

.page-about .about-quote__cite {
  display: block;
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ---------- details ---------- */
.page-about .about-details {
  margin-top: 18px;
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-about .about-details__summary {
  cursor: pointer;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  list-style: none;
  position: relative;
  padding-left: 20px;
}

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

.page-about .about-details__summary::before {
  content: "+";
  position: absolute;
  left: 0;
  top: -1px;
  color: var(--orange);
  font-size: 0.95rem;
}

.page-about .about-details[open] .about-details__summary::before {
  content: "−";
}

.page-about .about-details__summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 4px;
}

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

.page-about .about-details__list li {
  position: relative;
  padding: 8px 0 8px 18px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--mist);
  border-bottom: 1px solid var(--line);
}

.page-about .about-details__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- spec ---------- */
.page-about .about-spec {
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-spec__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-spec__key {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-spec__val {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-spec__val .mono {
  color: var(--cyan);
  font-size: 0.98rem;
}

/* ---------- honors ---------- */
.page-about .about-honor {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-honor__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-honor__year {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-honor__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--paper);
}

.page-about .about-honor__note {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-honor__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- cta ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 6vw, 64px);
  padding: clamp(26px, 5vw, 46px) clamp(20px, 4vw, 40px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    radial-gradient(520px 240px at 88% 0%, rgba(255, 107, 53, 0.14), transparent 70%),
    linear-gradient(140deg, rgba(18, 48, 79, 0.85), rgba(7, 17, 31, 0.9));
}

.page-about .about-cta__title {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 3.6vw, 1.9rem);
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

.page-about .about-cta__links .btn {
  flex: 1 1 auto;
  min-width: 150px;
  text-align: center;
}

/* ---------- reveal ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- responsive ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 34px);
  }

  .page-about .about-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-matrix__cell:nth-child(3) {
    grid-column: 1 / -1;
  }

  .page-about .about-spec__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .about-honor__row {
    grid-template-columns: 150px minmax(0, 1fr) minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-entry {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
  }

  .page-about .about-entry__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-entry__line {
    width: 1px;
    height: auto;
    min-height: 140px;
    flex: 1 1 auto;
    background: linear-gradient(180deg, var(--line-strong), rgba(201, 214, 228, 0));
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 1;
  }

  .page-about .about-split--reverse .about-figure {
    order: 2;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 20px;
    padding: 18px 0 20px 26px;
  }

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

  .page-about .about-matrix__cell:nth-child(3) {
    grid-column: auto;
  }

  .page-about .about-matrix__cell:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .about-matrix__cell:nth-child(2):hover,
  .page-about .about-matrix__cell:nth-child(2):focus-within {
    transform: translateY(14px);
  }
}

@media (hover: none) {
  .page-about .about-matrix__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .page-about .about-matrix__cell:hover,
  .page-about .about-matrix__cell:focus-within {
    transform: none;
  }
}