.page-about {
  --about-space: clamp(56px, 9vw, 100px);
  background: var(--bg-deep);
  color: var(--text-1);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 26px);
}

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

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(80px, 11vw, 118px) clamp(44px, 6vw, 68px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-about .about-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.62) brightness(0.45) contrast(1.14);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(38, 51, 63, 0.5) 1px, transparent 1px),
    radial-gradient(90% 70% at 78% 8%, rgba(61, 242, 192, 0.18), transparent 62%),
    linear-gradient(180deg, rgba(5, 7, 12, 0.62) 0%, rgba(5, 7, 12, 0.9) 58%, var(--bg-deep) 100%);
  background-size: calc(100% / 8) 100%, 100% 100%, 100% 100%;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__copy {
  margin-bottom: 40px;
}

.page-about .about-hero__copy .label {
  margin-bottom: 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(2.05rem, 5vw, 3.85rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--text-1);
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: var(--text-2);
  max-width: 34em;
  margin: 0 0 28px;
}

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

.page-about .about-hero__deck {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .deck-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, rgba(20, 30, 43, 0.96), rgba(11, 17, 26, 0.96));
  padding: 18px 20px 20px;
  box-shadow: inset 0 1px 0 rgba(233, 239, 246, 0.05), 0 30px 60px -40px #000;
}

.page-about .deck-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42px;
  height: 42px;
  border-top: 1px solid var(--cyan-dim);
  border-right: 1px solid var(--cyan-dim);
  border-top-right-radius: var(--radius-card);
  opacity: 0.75;
  pointer-events: none;
}

.page-about .deck-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-about .deck-card__live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .deck-card__num {
  font-family: var(--font-mono);
  font-size: clamp(48px, 7vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  margin: 14px 0 8px;
}

.page-about .deck-card__cap {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-2);
  margin: 0 0 16px;
}

.page-about .deck-card__bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .deck-card__bars li {
  position: relative;
  height: 4px;
  border-radius: 2px;
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .deck-card__bars li::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--w, 40%);
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan-dim), var(--cyan));
}

.page-about .deck-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.page-about .deck-chip {
  display: grid;
  gap: 3px;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  background: rgba(20, 30, 43, 0.6);
}

.page-about .deck-chip__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

.page-about .deck-chip__v {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--text-1);
}

.page-about .deck-chip__u {
  font-size: 11.5px;
  color: var(--text-3);
}

/* ---------- Chapters ---------- */

.page-about .about-chapter {
  position: relative;
  padding-block: var(--about-space);
  scroll-margin-top: 96px;
}

.page-about .about-chapter + .about-chapter,
.page-about .about-closing {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter__side {
  position: relative;
  padding-left: 16px;
  border-left: 1px solid var(--line);
  margin-bottom: 24px;
}

.page-about .about-chapter__side .chapter-index {
  display: block;
  margin-bottom: 12px;
}

.page-about .about-chapter__note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-3);
  margin: 0 0 18px;
}

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

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.1vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: var(--text-1);
}

.page-about .about-chapter__body p {
  font-size: 16px;
  line-height: 1.82;
  color: var(--text-2);
  margin: 0 0 16px;
}

.page-about .about-chapter__lead {
  color: var(--text-1) !important;
  font-size: 17px !important;
}

.page-about .about-chapter__more {
  margin-top: 24px !important;
}

.page-about .about-chapter__more a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
  padding-bottom: 3px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-chapter__more a:hover {
  color: var(--text-1);
  border-color: var(--text-1);
}

/* ---------- Fact list ---------- */

.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-facts dt {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 19px;
  color: var(--cyan);
  line-height: 1;
}

/* ---------- Stats ---------- */

.page-about .stat-strip {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .stat-strip li {
  display: grid;
  gap: 6px;
  padding: 16px 16px 18px;
  background: var(--bg-panel);
}

.page-about .stat-strip__v {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1;
  color: var(--text-1);
}

.page-about .stat-strip__k {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-3);
}

/* ---------- Year rail ---------- */

.page-about .year-rail {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 18px;
  position: relative;
}

.page-about .year-rail::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-dim), rgba(27, 143, 118, 0.12));
}

.page-about .year-rail__item {
  position: relative;
  padding-block: 7px;
}

.page-about .year-rail__item::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 14px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 1px solid var(--cyan);
}

.page-about .year-rail__link {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .year-rail__link:hover {
  color: var(--cyan);
}

/* ---------- Versions ---------- */

.page-about .version {
  position: relative;
  border-left: 1px solid var(--line);
  padding-left: 20px;
  margin: 0 0 30px;
  scroll-margin-top: 110px;
}

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

.page-about .version::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 242, 192, 0.12);
}

.page-about .version__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0 0 6px;
}

.page-about .version__title {
  font-family: var(--font-head);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  letter-spacing: -0.005em;
  color: var(--text-1);
  margin: 0 0 8px;
  line-height: 1.3;
}

.page-about .version p {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-2);
  margin: 0;
}

/* ---------- Figures ---------- */

.page-about .about-figure {
  margin: 0 0 30px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--bg-panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: grayscale(0.42) brightness(0.72);
}

/* ---------- Track diagram ---------- */

.page-about .track-figure {
  margin: 34px 0 0;
}

.page-about .track {
  display: block;
  width: 100%;
  height: auto;
  background: linear-gradient(180deg, rgba(11, 17, 26, 0.9), rgba(5, 7, 12, 0.4));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
}

.page-about .track__mesh {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .track__line-a {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1.6;
}

.page-about .track__line-b {
  fill: none;
  stroke: var(--amber);
  stroke-width: 1.6;
}

.page-about .track__node {
  fill: var(--bg-deep);
  stroke: var(--cyan);
  stroke-width: 1.6;
}

.page-about .track__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  fill: var(--text-3);
}

.page-about .track__label--a {
  fill: var(--cyan);
}

.page-about .track__label--b {
  fill: var(--amber);
}

.page-about .track-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-3);
}

/* ---------- Closing ---------- */

.page-about .about-closing {
  padding-block: var(--about-space);
  background:
    radial-gradient(70% 60% at 18% 0%, rgba(61, 242, 192, 0.08), transparent 62%),
    var(--bg-deep);
}

.page-about .about-closing__title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  color: var(--text-1);
}

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

.page-about .about-closing__links li {
  background: var(--bg-panel);
}

.page-about .about-closing__links a {
  display: grid;
  gap: 6px;
  padding: 20px 22px;
  text-decoration: none;
  color: var(--text-1);
  transition: background 0.2s var(--ease);
}

.page-about .about-closing__links strong {
  font-family: var(--font-head);
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--text-1);
}

.page-about .about-closing__links span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-3);
}

.page-about .about-closing__links a:hover {
  background: var(--bg-float);
}

.page-about .about-closing__links a:hover strong {
  color: var(--cyan);
}

/* ---------- Responsive ---------- */

@media (max-width: 479px) {
  .page-about .deck-row {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 720px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-closing__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__copy {
    grid-column: 1 / span 7;
    margin-bottom: 0;
  }

  .page-about .about-hero__deck {
    grid-column: 8 / span 5;
  }

  .page-about .about-chapter__side {
    grid-column: 1 / span 3;
    margin-bottom: 0;
  }

  .page-about .about-chapter__body {
    grid-column: 5 / span 7;
  }
}

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

.page-about {
  --w: 1rem;
}