.page-about {
  --about-pad: clamp(2.4rem, 6vw, 4.4rem);
  --about-muted: var(--grey-400);
  --about-line: rgba(143, 166, 184, 0.2);
  background: var(--sea-950);
  color: var(--grey-100);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.8rem, 5vw, 3rem) 0 clamp(2.4rem, 6vw, 4rem);
  background: linear-gradient(158deg, var(--sea-900) 0%, var(--sea-800) 48%, var(--sea-950) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -28%;
  right: -14%;
  width: 60%;
  height: 152%;
  background: linear-gradient(180deg, rgba(255, 107, 44, 0.15), rgba(43, 224, 200, 0.05));
  transform: skewX(-13deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 0.5rem 0 0;
  font-family: var(--ff-title);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(1.85rem, 5.6vw, 3.4rem);
  line-height: 1.12;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  margin: 1rem 0 0;
  max-width: 60ch;
  color: var(--grey-100);
  font-size: clamp(0.95rem, 2.2vw, 1.05rem);
  line-height: 1.8;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem 2rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.page-about .about-hero__num {
  font-family: var(--ff-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--orange-300);
  line-height: 1.1;
}

.page-about .about-hero__cap {
  font-size: 0.78rem;
  color: var(--about-muted);
  letter-spacing: 0.02em;
}

.page-about .chapnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin-top: 1.6rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--about-line);
}

.page-about .chapnav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  font-size: 0.84rem;
  color: var(--grey-100);
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .chapnav__link:hover,
.page-about .chapnav__link:focus-visible {
  color: var(--mint-400);
  border-bottom-color: var(--mint-400);
}

.page-about .chapnav__idx {
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  color: var(--orange-500);
}

.page-about .about-hero__stamp {
  border: 1px solid var(--about-line);
  background: rgba(6, 23, 35, 0.6);
  padding: 1rem 1rem 1.1rem;
}

.page-about .stamp__title {
  margin: 0 0 0.7rem;
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mint-400);
}

.page-about .vstrip {
  display: flex;
  flex-direction: column;
}

.page-about .vstrip__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.5rem 0.1rem;
  border-bottom: 1px dashed var(--about-line);
  font-family: var(--ff-mono);
  font-size: 0.78rem;
  color: var(--about-muted);
}

.page-about .vstrip__row:last-child {
  border-bottom: 0;
}

.page-about .vstrip__row b {
  font-weight: 600;
  color: var(--grey-100);
}

.page-about .vstrip__row--now b,
.page-about .vstrip__row--now span {
  color: var(--orange-300);
}

.page-about .stamp__note {
  margin: 0.9rem 0 0;
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .chapter {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--hair-soft);
}

.page-about .chapter--sea {
  background: var(--sea-800);
}

.page-about .chapter--lib {
  background: linear-gradient(180deg, var(--sea-900), var(--sea-950));
}

.page-about .chapter--eco {
  background: var(--sea-900);
}

.page-about .chapter--light {
  background: var(--paper-050);
  color: var(--ink-900);
  --about-muted: #55697a;
  --about-line: rgba(10, 18, 24, 0.14);
}

.page-about .chapter__grid {
  display: grid;
  gap: 1.2rem;
}

.page-about .chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.page-about .chapter__aside .sec-num {
  font-family: var(--ff-mono);
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1;
  color: var(--orange-500);
}

.page-about .chapter__kicker {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--about-muted);
}

.page-about .chapter__body h2 {
  margin: 0 0 1rem;
  font-family: var(--ff-title);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .chapter__lede {
  margin: 0 0 1.4rem;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .chapter__body .prose p {
  margin: 0 0 1rem;
  max-width: 64ch;
  font-size: 0.97rem;
  line-height: 1.8;
}

.page-about .chapter--light .chapter__body .prose p {
  color: #2b3a45;
}

.page-about a {
  color: var(--mint-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 224, 200, 0.45);
}

.page-about .chapter--light a {
  color: #0f5a52;
  border-bottom-color: rgba(15, 90, 82, 0.4);
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--orange-300);
  border-bottom-color: var(--orange-500);
}

.page-about .pillars {
  display: grid;
  gap: 0.7rem;
  margin: 1.4rem 0 1.6rem;
  padding: 0;
  list-style: none;
}

.page-about .pillars__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--mint-400);
  background: rgba(21, 74, 110, 0.28);
}

.page-about .pillars__name {
  font-family: var(--ff-title);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--grey-100);
}

.page-about .pillars__desc {
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .about-figure {
  margin: 1.6rem 0 0;
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  background: var(--sea-700);
}

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

.page-about .about-figure--tilt {
  transform: skewY(-1.4deg);
}

.page-about .about-figure--tilt img {
  transform: skewY(1.4deg) scale(1.03);
}

.page-about .about-figure__cap {
  margin: 0;
  padding: 0.6rem 0.9rem;
  font-family: var(--ff-mono);
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--grey-100);
  background: rgba(6, 23, 35, 0.82);
}

/* ---- timeline ---- */
.page-about .tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 1rem;
  bottom: 1.2rem;
  width: 2px;
  background: linear-gradient(180deg, var(--mint-400), rgba(255, 107, 44, 0.75));
  opacity: 0.55;
}

.page-about .tl__item {
  position: relative;
  margin-bottom: 0.55rem;
}

.page-about .tl__node {
  border: 1px solid var(--about-line);
  background: rgba(6, 23, 35, 0.42);
}

.page-about .tl__summary {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.85rem 0.9rem 0.85rem 1.9rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__summary::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.25rem;
  width: 9px;
  height: 9px;
  background: var(--mint-400);
  transform: rotate(45deg);
  transition: background var(--dur-fast) var(--ease);
}

.page-about .tl__node[open] > .tl__summary::before {
  background: var(--orange-500);
}

.page-about .tl__year {
  font-family: var(--ff-mono);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--orange-300);
}

.page-about .tl__title {
  font-family: var(--ff-title);
  font-weight: 700;
  font-size: 1rem;
  color: var(--grey-100);
}

.page-about .tl__body {
  padding: 0 0.95rem 1rem 1.9rem;
}

.page-about .tl__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .tl__foot {
  margin: 1.2rem 0 0;
  padding-left: 1.9rem;
  font-family: var(--ff-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---- team ---- */
.page-about .team {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .team__card {
  border: 1px solid var(--about-line);
  background: rgba(233, 239, 244, 0.55);
  padding: 0.2rem 0.9rem;
}

.page-about .team__card[open] {
  border-left: 3px solid var(--orange-500);
  background: #ffffff;
}

.page-about .team__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.3rem 1rem;
  padding: 0.8rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team__role {
  font-family: var(--ff-title);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink-900);
}

.page-about .team__count {
  font-family: var(--ff-mono);
  font-size: 0.74rem;
  color: #55697a;
}

.page-about .team__body {
  margin: 0 0 0.85rem;
  font-size: 0.9rem;
  line-height: 1.78;
  color: #2b3a45;
}

/* ---- libraries ---- */
.page-about .lib {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.page-about .lib__card {
  padding: 1.2rem 1.1rem 1.3rem;
  border: 1px solid var(--about-line);
  background: rgba(11, 41, 64, 0.7);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .lib__card--accent {
  border-color: rgba(255, 107, 44, 0.55);
  background: linear-gradient(160deg, rgba(255, 107, 44, 0.14), rgba(11, 41, 64, 0.85));
}

.page-about .lib__label {
  margin: 0;
  font-family: var(--ff-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--mint-400);
}

.page-about .lib__num {
  margin: 0.4rem 0 0;
  font-family: var(--ff-mono);
  font-size: clamp(2.2rem, 7vw, 3rem);
  font-weight: 600;
  line-height: 1;
  color: var(--orange-300);
}

.page-about .lib__unit {
  margin: 0.2rem 0 0.8rem;
  font-size: 0.82rem;
  color: var(--about-muted);
}

.page-about .lib__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--grey-100);
}

.page-about .lib__notes {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .lib__notes li {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .lib__notes .tag {
  flex: none;
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  padding: 0.12rem 0.4rem;
  color: var(--sea-950);
  background: var(--mint-400);
}

/* ---- archive ---- */
.page-about .arch {
  display: grid;
  gap: 1.2rem;
  margin-top: 1.2rem;
}

.page-about .arch__figure {
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  background: var(--sea-700);
}

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

.page-about .arch-tabs {
  border: 1px solid var(--about-line);
  background: rgba(6, 23, 35, 0.5);
  padding: 0.9rem;
}

.page-about .arch-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .arch-tabs__labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}

.page-about .arch-tabs__label {
  cursor: pointer;
  padding: 0.38rem 0.75rem;
  font-family: var(--ff-mono);
  font-size: 0.78rem;
  color: var(--grey-100);
  border: 1px solid var(--about-line);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.page-about .arch-tabs__label:hover {
  border-color: var(--mint-400);
  color: var(--mint-400);
}

.page-about .arch-tabs__panel {
  display: none;
}

.page-about .arch-tabs__panel p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--grey-100);
}

.page-about #arch-mode-1:checked ~ .arch-tabs__labels .arch-tabs__label[for="arch-mode-1"],
.page-about #arch-mode-2:checked ~ .arch-tabs__labels .arch-tabs__label[for="arch-mode-2"],
.page-about #arch-mode-3:checked ~ .arch-tabs__labels .arch-tabs__label[for="arch-mode-3"] {
  background: var(--orange-500);
  border-color: var(--orange-500);
  color: var(--sea-950);
}

.page-about #arch-mode-1:checked ~ .arch-tabs__panels .arch-tabs__panel:nth-child(1),
.page-about #arch-mode-2:checked ~ .arch-tabs__panels .arch-tabs__panel:nth-child(2),
.page-about #arch-mode-3:checked ~ .arch-tabs__panels .arch-tabs__panel:nth-child(3) {
  display: block;
}

.page-about .arch-tabs__radio:focus-visible ~ .arch-tabs__labels {
  outline: 2px solid var(--mint-400);
  outline-offset: 3px;
}

.page-about .arch__export {
  margin-top: 1.2rem;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--mint-400);
  background: rgba(21, 74, 110, 0.32);
}

.page-about .arch__export p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--grey-100);
}

/* ---- ecosystem ---- */
.page-about .eco__stats {
  display: grid;
  gap: 0.7rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__stats .stat {
  padding: 0.85rem 1rem;
  border: 1px solid var(--about-line);
  background: rgba(21, 74, 110, 0.24);
}

.page-about .eco__stats .stat__num {
  display: block;
  font-family: var(--ff-mono);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--mint-400);
  line-height: 1.1;
}

.page-about .eco__stats .stat__label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .honor {
  margin-top: 1.6rem;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(255, 163, 107, 0.45);
  background: linear-gradient(150deg, rgba(255, 107, 44, 0.12), rgba(6, 23, 35, 0.5));
}

.page-about .honor__title {
  margin: 0 0 0.5rem;
  font-family: var(--ff-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--orange-300);
}

.page-about .honor__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--grey-100);
}

/* ---- principles & contact ---- */
.page-about .principles {
  display: grid;
  gap: 0.8rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
}

.page-about .principles__item {
  padding: 0.9rem 1rem;
  border-top: 2px solid var(--orange-500);
  background: rgba(21, 74, 110, 0.24);
}

.page-about .principles__k {
  display: block;
  font-family: var(--ff-title);
  font-weight: 700;
  font-size: 1rem;
  color: var(--grey-100);
  margin-bottom: 0.3rem;
}

.page-about .principles__item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .contact-note {
  margin: 1rem 0 0;
  font-family: var(--ff-mono);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---- responsive ---- */
@media (min-width: 720px) {
  .page-about .pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team,
  .page-about .eco__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(240px, 0.55fr);
    gap: clamp(1.6rem, 4vw, 3rem);
  }

  .page-about .chapter__grid {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: clamp(1.4rem, 3.5vw, 3rem);
  }

  .page-about .chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    position: sticky;
    top: 1.5rem;
    align-self: start;
  }

  .page-about .chapter__aside .sec-num {
    font-size: 2.2rem;
  }

  .page-about .arch {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-about .about-hero .lede {
    max-width: 62ch;
  }

  .page-about .chapter__body h2 {
    max-width: 32ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure--tilt,
  .page-about .about-figure--tilt img {
    transform: none;
  }

  .page-about * {
    transition-duration: 0.01ms !important;
  }
}
<<<PAGE_CSS_END>>>