.page-about {
  --rail-w: 190px;
  --about-max: 68ch;
  background: var(--bg);
  color: var(--silver);
}

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

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 34px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 46, 74, 0.34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 46, 74, 0.22) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(120% 90% at 80% 8%, #000 0%, transparent 70%);
  mask-image: radial-gradient(120% 90% at 80% 8%, #000 0%, transparent 70%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(22px, 4vw, 44px);
  align-items: end;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(270px, 0.75fr);
  }
}

.page-about .about-hero__main h1 {
  font-family: var(--f-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.07;
  font-size: clamp(30px, 5.2vw, 54px);
  color: var(--white);
  margin: 14px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__main .lede {
  max-width: var(--about-max);
  font-size: clamp(15px, 1.6vw, 16.8px);
  line-height: 1.68;
  color: var(--silver);
  margin: 0;
}

.page-about .about-hero__panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(20, 31, 53, 0.94), rgba(13, 21, 36, 0.96));
  box-shadow: var(--shadow);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  left: clamp(18px, 2.4vw, 26px);
  right: clamp(18px, 2.4vw, 26px);
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(51, 230, 208, 0));
}

.page-about .about-hero__code {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--line-soft);
}

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

.page-about .about-hero__k {
  font-size: 13px;
  color: var(--steel);
  white-space: nowrap;
}

.page-about .about-hero__v {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  text-align: right;
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- Index cards ---------- */

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

.page-about .about-index__head {
  max-width: var(--about-max);
}

.page-about .about-index__head h2,
.page-about .about-milestones h2,
.page-about .about-next h2 {
  font-family: var(--f-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(23px, 3.2vw, 34px);
  color: var(--white);
  margin: 12px 0 12px;
}

.page-about .about-index__head .prose {
  margin: 0;
  font-size: 15.5px;
}

.page-about .about-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(228px, 1fr));
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

@media (min-width: 1024px) {
  .page-about .about-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-cards > :nth-child(2) {
    margin-top: 20px;
  }
  .page-about .about-cards > :nth-child(4) {
    margin-top: 20px;
  }
}

.page-about .about-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 22px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(20, 31, 53, 0.76), rgba(13, 21, 36, 0.92));
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--mid), rgba(44, 74, 124, 0));
}

.page-about .about-card:hover,
.page-about .about-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: 0 22px 46px -30px rgba(51, 230, 208, 0.75);
}

.page-about .about-card__k {
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-card__v {
  font-size: clamp(30px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-card__t {
  font-size: 14.4px;
  line-height: 1.58;
  color: var(--silver);
}

.page-about .about-card__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.55;
  color: var(--steel);
  transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease);
}

.page-about .about-card:hover .about-card__more,
.page-about .about-card:focus-visible .about-card__more {
  max-height: 80px;
  opacity: 1;
}

.page-about .about-index__band {
  margin: clamp(34px, 5vw, 58px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-index__band img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
}

/* ---------- Layout with rail ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(38px, 6vw, 82px) 0;
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 72px);
  }
}

.page-about .about-rail {
  align-self: start;
}

@media (min-width: 980px) {
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    padding-left: 14px;
    border-left: 2px solid var(--line);
  }
}

.page-about .about-rail__title {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

@media (min-width: 980px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }
}

.page-about .about-rail__list a {
  display: block;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.6px;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
  background: var(--cyan-soft);
}

/* ---------- Blocks ---------- */

.page-about .about-block + .about-block {
  margin-top: clamp(48px, 7vw, 96px);
}

.page-about .about-block__head {
  max-width: var(--about-max);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-block__head h2 {
  font-family: var(--f-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.16;
  font-size: clamp(22px, 3vw, 31px);
  color: var(--white);
  margin: 12px 0 12px;
}

.page-about .about-block__head .prose {
  margin: 0;
  font-size: 15.2px;
}

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 230, 208, 0.4);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- History ---------- */

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

.page-about .about-year {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
}

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

@media (min-width: 720px) {
  .page-about .about-year {
    grid-template-columns: 124px minmax(0, 1fr);
    gap: 26px;
    padding: 26px 0;
  }
}

.page-about .about-year__no {
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.page-about .about-year__body h3 {
  margin: 0 0 8px;
  font-size: 17.5px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

.page-about .about-year__body p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.68;
  color: var(--silver);
  max-width: 60ch;
}

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

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-roles li {
  padding: 17px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(13, 21, 36, 0.74);
}

.page-about .about-roles h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-roles h3 .mono {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-roles p {
  margin: 0;
  font-size: 14.4px;
  line-height: 1.64;
  color: var(--silver);
}

.page-about .about-team__panel {
  border-radius: var(--r-lg);
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-md);
  margin-bottom: 18px;
}

.page-about .about-chart {
  display: grid;
  gap: 13px;
}

.page-about .about-chart__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 38px;
  align-items: center;
  gap: 12px;
}

.page-about .about-chart__name {
  font-size: 13.4px;
  color: var(--silver);
}

.page-about .about-chart__track {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(30, 46, 74, 0.9);
  overflow: hidden;
}

.page-about .about-chart__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--mid), var(--cyan));
}

.page-about .about-chart__row:nth-child(1) .about-chart__fill {
  width: 38.3%;
}

.page-about .about-chart__row:nth-child(2) .about-chart__fill {
  width: 25.8%;
}

.page-about .about-chart__row:nth-child(3) .about-chart__fill {
  width: 35.8%;
}

.page-about .about-chart__num {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  text-align: right;
}

/* ---------- Regions ---------- */

.page-about .about-regions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
  gap: 14px;
}

.page-about .about-region {
  position: relative;
  padding: 18px 18px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(13, 21, 36, 0.92), rgba(7, 11, 20, 0.72));
  transition: border-color 0.22s var(--ease);
}

.page-about .about-region:hover {
  border-color: var(--steel);
}

.page-about .about-region::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--mid), rgba(44, 74, 124, 0));
}

.page-about .about-region__no {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--steel);
  margin-bottom: 10px;
}

.page-about .about-region h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-region p {
  margin: 0;
  font-size: 14.2px;
  line-height: 1.62;
  color: var(--silver);
}

/* ---------- Platform facts ---------- */

.page-about .about-facts {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line-soft);
}

@media (min-width: 860px) {
  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 44px;
  }
}

.page-about .about-fact {
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-fact dt {
  margin-bottom: 9px;
  font-size: 13.6px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 14.6px;
  line-height: 1.68;
  color: var(--silver);
}

/* ---------- Milestones ---------- */

.page-about .about-milestones {
  padding: clamp(44px, 7vw, 92px) 0 clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 60% at 50% 0%, rgba(44, 74, 124, 0.24), transparent 72%),
    var(--bg);
}

.page-about .about-ms-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
  margin-bottom: clamp(30px, 5vw, 56px);
}

@media (min-width: 780px) {
  .page-about .about-ms-head {
    grid-template-columns: minmax(0, 1fr) 210px;
  }
}

.page-about .about-ms-head .prose {
  margin: 0;
  font-size: 15.2px;
  max-width: 54ch;
}

.page-about .about-ms-art {
  display: block;
  width: 100%;
  max-width: 210px;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  margin-left: auto;
}

.page-about .about-axis {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 9px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line), var(--mid), var(--line), transparent);
}

.page-about .about-axis__item {
  position: relative;
  padding-left: 36px;
}

.page-about .about-axis__dot {
  position: absolute;
  top: 26px;
  left: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--mid);
  transform: translateX(-50%);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), box-shadow 0.22s var(--ease);
  z-index: 1;
}

.page-about .about-axis__item:has(details[open]) .about-axis__dot {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-soft);
}

@media (min-width: 880px) {
  .page-about .about-axis::before {
    left: 50%;
  }
  .page-about .about-axis__item {
    width: calc(50% - 34px);
    padding-left: 0;
  }
  .page-about .about-axis__item:nth-child(even) {
    margin-left: calc(50% + 34px);
  }
  .page-about .about-axis__item:nth-child(odd) .about-axis__dot {
    left: auto;
    right: -34px;
    transform: translateX(50%);
  }
  .page-about .about-axis__item:nth-child(even) .about-axis__dot {
    left: -34px;
    transform: translateX(-50%);
  }
}

.page-about .about-node {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(13, 21, 36, 0.84);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-node:hover {
  border-color: var(--steel);
}

.page-about .about-node[open] {
  border-color: rgba(51, 230, 208, 0.55);
  background: rgba(13, 21, 36, 0.96);
}

.page-about .about-node__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__year {
  flex: 0 0 auto;
  font-size: 12.6px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-node__title {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  line-height: 1.4;
}

.page-about .about-node__chev {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-left: 6px;
  border-right: 2px solid var(--steel);
  border-bottom: 2px solid var(--steel);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-node[open] .about-node__chev {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-about .about-node__body {
  margin: 0 18px 18px;
  padding-top: 13px;
  border-top: 1px dashed var(--line-soft);
  font-size: 14.3px;
  line-height: 1.66;
  color: var(--silver);
}

/* ---------- Next ---------- */

.page-about .about-next {
  border-top: 1px solid var(--line-soft);
  padding: clamp(36px, 5vw, 66px) 0 clamp(48px, 7vw, 84px);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(228px, 1fr));
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(13, 21, 36, 0.72);
  text-decoration: none;
  color: inherit;
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
  background: rgba(20, 31, 53, 0.92);
}

.page-about .about-next__card strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.45;
}

.page-about .about-next__card span {
  font-size: 13.6px;
  line-height: 1.58;
  color: var(--steel);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-next__card,
  .page-about .about-rail__list a,
  .page-about .about-node,
  .page-about .about-card__more,
  .page-about .about-node__chev,
  .page-about .about-axis__dot {
    transition: none;
  }
  .page-about .about-card:hover,
  .page-about .about-card:focus-visible,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}