.page-about {
  --about-rail: 208px;
  --about-gap: clamp(32px, 5vw, 76px);
  background: var(--ink);
  color: var(--mist);
  padding-bottom: clamp(56px, 8vw, 120px);
  overflow-x: clip;
}

.page-about .container {
  width: var(--shell);
  margin-inline: auto;
}

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

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(22px, 3.5vw, 42px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -60px;
  left: -10%;
  width: 60%;
  height: 340px;
  background: radial-gradient(closest-side, rgba(200, 255, 61, 0.09), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero h1 {
  font-family: var(--display);
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--white);
  margin: 16px 0 0;
  max-width: 17ch;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(242, 245, 241, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__board {
  position: relative;
  align-self: start;
  background: linear-gradient(158deg, var(--deep) 0%, var(--carbon) 100%);
  border: 1px solid var(--line-lime);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 2.6vw, 30px);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.44);
}

.page-about .about-hero__board::after {
  content: "";
  position: absolute;
  right: -1px;
  top: 26px;
  bottom: 26px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 61, 0));
}

.page-about .board__caption {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .board__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .board__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .board__row dt {
  font-size: 14px;
  color: var(--slate);
  white-space: nowrap;
}

.page-about .board__row dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .board__num {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(24px, 2.6vw, 34px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .board__unit {
  font-size: 13px;
  color: var(--slate);
}

/* ---------- Body layout with rail ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .about-rail {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  padding: 14px;
}

.page-about .about-rail .rail__title {
  margin: 0 0 10px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-rail .rail__item {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-rail .rail__item:hover,
.page-about .about-rail .rail__item:focus-visible {
  color: var(--mist);
  border-color: var(--line);
}

.page-about .about-rail .rail__item.is-active {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- Stages ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-stage {
  padding: clamp(36px, 6vw, 76px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-flow > .about-stage:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .stage-head h2 {
  font-family: var(--display);
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .stage-lede {
  margin-top: clamp(18px, 2.4vw, 26px);
  max-width: 62ch;
}

.page-about .prose p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 245, 241, 0.8);
}

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

.page-about .prose h3 {
  color: var(--white);
}

/* ---------- Split stage ---------- */
.page-about .stage-split {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: clamp(22px, 3.5vw, 44px);
}

.page-about .stage-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--carbon);
  overflow: hidden;
}

.page-about .stage-figure--wide {
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .stage-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .stage-figure--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .stage-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- Content lines ---------- */
.page-about .lines-grid {
  margin-top: clamp(24px, 3.4vw, 38px);
  display: grid;
  gap: 16px;
}

.page-about .line-card {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--carbon);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .line-card:hover {
  border-color: var(--line-lime);
  transform: translateY(-3px);
}

.page-about .line-card__idx {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
  border: 1px solid var(--line-lime);
  border-radius: 6px;
  padding: 2px 7px;
}

.page-about .line-card h3 {
  margin: 14px 0 10px;
  font-size: 17px;
  color: var(--white);
}

.page-about .line-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- Version list ---------- */
.page-about .version-list {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 12px;
}

.page-about .version {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--carbon);
  overflow: hidden;
  transition: border-color 0.3s var(--ease);
}

.page-about .version[open] {
  border-color: var(--line-lime);
}

.page-about .version summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
}

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

.page-about .version summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .version__tag {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .version__meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .version__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

.page-about .version__year {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .version__mark {
  position: relative;
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
}

.page-about .version__mark::before,
.page-about .version__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--lime);
  border-radius: 2px;
}

.page-about .version__mark::before {
  width: 14px;
  height: 2px;
}

.page-about .version__mark::after {
  width: 2px;
  height: 14px;
  transition: opacity 0.25s var(--ease);
}

.page-about .version[open] .version__mark::after {
  opacity: 0;
}

.page-about .version__body {
  padding: 0 22px 22px;
  border-top: 1px solid var(--line-soft);
  margin-top: 0;
}

.page-about .version__body p {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 245, 241, 0.8);
  max-width: 68ch;
}

/* ---------- Team ---------- */
.page-about .team-grid {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: clamp(22px, 3.5vw, 42px);
}

.page-about .team-groups {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .group-card {
  padding: 20px 20px 22px;
  border-left: 3px solid var(--lime);
  border-top: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--deep);
}

.page-about .group-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--white);
}

.page-about .group-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .stage-quote {
  margin: 6px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--lime);
  background: rgba(200, 255, 61, 0.05);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .stage-quote p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- Timeline ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0 8px;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), rgba(200, 255, 61, 0.08));
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  margin-bottom: clamp(26px, 3.6vw, 40px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.1);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.1;
  color: var(--lime);
  letter-spacing: -0.01em;
}

.page-about .timeline__body h3 {
  margin: 8px 0 8px;
  font-size: 17px;
  color: var(--white);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 245, 241, 0.78);
  max-width: 62ch;
}

/* ---------- Audience ---------- */
.page-about .who-grid {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 16px;
}

.page-about .who-card {
  padding: 22px 20px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--deep), var(--carbon));
}

.page-about .who-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--white);
}

.page-about .who-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- Why ---------- */
.page-about .why-grid {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 14px;
}

.page-about .why-card {
  display: block;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--carbon);
  text-decoration: none;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .why-card:hover,
.page-about .why-card:focus-visible {
  border-color: var(--lime);
  background: var(--deep);
  transform: translateY(-3px);
}

.page-about .why-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--white);
}

.page-about .why-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .why-card__more {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lime);
  border-bottom: 1px solid var(--line-lime);
  padding-bottom: 2px;
}

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .page-about .lines-grid,
  .page-about .who-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    align-items: end;
  }

  .page-about .stage-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .stage-figure--tall {
    position: sticky;
    top: calc(var(--header-space) + 28px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-space) + 22px);
    align-self: start;
    padding: 18px 16px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
  }

  .page-about .about-rail .rail__item {
    display: block;
    border-radius: 10px;
  }
}

@media (min-width: 1240px) {
  .page-about .lines-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 400px) {
  .page-about .version summary {
    gap: 12px;
    padding: 16px 16px;
  }

  .page-about .version__body {
    padding: 0 16px 20px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .why-card,
  .page-about .version__mark::after {
    transition: none;
  }

  .page-about .line-card:hover,
  .page-about .why-card:hover {
    transform: none;
  }
}