.page-about {
  position: relative;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(24px, 4.5vw, 52px) clamp(34px, 5.5vw, 72px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero .glow {
  position: absolute;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-hero .glow--blue {
  top: -150px;
  right: -110px;
  width: min(540px, 72vw);
  height: min(540px, 72vw);
}

.page-about .about-hero .glow--cyan {
  bottom: -190px;
  left: -130px;
  width: min(440px, 62vw);
  height: min(440px, 62vw);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__title {
  margin-bottom: clamp(14px, 2vw, 20px);
  letter-spacing: .03em;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px 22px;
  margin-top: clamp(22px, 3.5vw, 34px);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta .stat {
  padding-left: 12px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-hero__meta .stat__value {
  font-size: clamp(22px, 3vw, 30px);
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__media .media__caption {
  margin-top: 10px;
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- Body shell + rail ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  padding-block: clamp(30px, 5vw, 72px);
}

.page-about .about-rail {
  position: relative;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gray);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 9px 14px;
  white-space: nowrap;
  scroll-snap-align: start;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--text-soft);
  font-size: 14px;
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--text);
  border-color: var(--line-strong);
  background: rgba(0, 240, 255, .07);
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 194px minmax(0, 1fr);
    gap: clamp(34px, 5vw, 74px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 116px;
    padding-top: 4px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    min-height: 40px;
    padding: 7px 12px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(0, 240, 255, .10), transparent 72%);
  }
}

/* ---------- Chapters ---------- */
.page-about .about-flow {
  display: grid;
  gap: 0;
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 118px;
  padding-block: clamp(30px, 4.5vw, 58px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-chapter--end {
  padding-bottom: 0;
}

.page-about .about-chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .about-chapter__index {
  padding: 3px 8px;
  font-size: 12px;
  letter-spacing: .1em;
  line-height: 1.4;
  color: var(--cyan);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
}

.page-about .about-chapter__title {
  margin: 0;
  letter-spacing: .02em;
}

.page-about .about-chapter__lead {
  max-width: 62ch;
  margin: 0 0 22px;
  color: var(--text-soft);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
}

.page-about .about-chapter__text {
  max-width: 68ch;
}

/* ---------- Features ---------- */
.page-about .about-features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-feature {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(16, 26, 49, .94), rgba(10, 14, 26, .94));
  box-shadow: var(--shadow-tile);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

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

.page-about .about-feature__title {
  margin: 12px 0 8px;
  font-size: clamp(17px, 2vw, 19px);
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-feature__text {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.72;
}

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

@media (min-width: 1020px) {
  .page-about .about-features {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-feature:first-child {
    grid-column: span 6;
  }

  .page-about .about-feature:nth-child(n + 2) {
    grid-column: span 3;
  }

  .page-about .about-feature:first-child .about-feature__text {
    max-width: 68ch;
  }
}

/* ---------- Team ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-team__cards {
  display: grid;
  gap: 14px;
}

.page-about .about-sheet {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper);
  border-radius: var(--radius);
  box-shadow: var(--shadow-plate);
}

.page-about .about-sheet::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(20, 17, 13, .07) 1px, transparent 1px);
  background-size: 6px 6px;
}

.page-about .about-sheet > * {
  position: relative;
  z-index: 1;
  margin: 0;
}

.page-about .about-sheet__label {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ink);
  opacity: .55;
}

.page-about .about-sheet__title {
  margin-bottom: 8px;
  font-size: clamp(17px, 2vw, 19px);
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-sheet__body {
  color: var(--ink);
  opacity: .82;
  font-size: 15px;
  line-height: 1.68;
}

.page-about .about-team__media {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

/* ---------- Sources ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
  align-items: center;
}

.page-about .about-sources__text p {
  max-width: 62ch;
  margin: 0 0 14px;
  color: var(--text-soft);
  line-height: 1.78;
}

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

.page-about .about-ring-wrap {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.page-about .about-ring {
  position: relative;
  display: grid;
  place-items: center;
  width: min(238px, 62vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: conic-gradient(
    var(--blue) 0deg 92deg,
    var(--cyan) 92deg 182deg,
    var(--orange) 182deg 268deg,
    var(--gray) 268deg 360deg
  );
  box-shadow: 0 0 0 1px var(--line), 0 24px 64px -34px rgba(0, 240, 255, .85);
}

.page-about .about-ring::before {
  content: "";
  position: absolute;
  inset: 16%;
  border-radius: 50%;
  background: var(--ink-deep);
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-about .about-ring__center {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2px;
  text-align: center;
}

.page-about .about-ring__value {
  font-size: clamp(30px, 5vw, 40px);
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-ring__unit {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--text-soft);
}

.page-about .about-ring__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  width: 100%;
  max-width: 350px;
}

.page-about .about-ring__legend li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  align-items: center;
  padding: 9px 11px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  color: var(--text-soft);
  transition: border-color .18s ease, background-color .18s ease, color .18s ease;
}

.page-about .about-ring__legend li:hover {
  border-color: var(--line);
  background: rgba(0, 102, 255, .09);
  color: var(--text);
}

.page-about .about-ring__dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.page-about .about-ring__dot--a { background: var(--blue); }
.page-about .about-ring__dot--b { background: var(--cyan); }
.page-about .about-ring__dot--c { background: var(--orange); }
.page-about .about-ring__dot--d { background: var(--gray); }

.page-about .about-ring__name {
  color: var(--text);
  letter-spacing: .04em;
}

.page-about .about-ring__desc {
  grid-column: 1 / -1;
  max-height: 6em;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.55;
  color: var(--gray);
  transition: max-height .24s ease, color .18s ease;
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .about-ring__desc {
    max-height: 0;
  }

  .page-about .about-ring__legend li:hover .about-ring__desc {
    max-height: 6em;
  }
}

@media (min-width: 860px) {
  .page-about .about-sources {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

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

.page-about .about-step {
  position: relative;
  padding: 0 0 24px 24px;
  border-left: 1px solid var(--line);
}

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

.page-about .about-step__dot {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, .16);
}

.page-about .about-step__version {
  margin: 0 0 5px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-size: clamp(16px, 1.9vw, 18px);
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-step__text {
  max-width: 42ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-soft);
}

@media (min-width: 880px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .about-step {
    padding: 26px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .about-step__dot {
    left: 0;
    top: -5px;
  }

  .page-about .about-step:nth-child(2) { margin-top: 30px; }
  .page-about .about-step:nth-child(3) { margin-top: 60px; }
  .page-about .about-step:nth-child(4) { margin-top: 90px; }
}

.page-about .about-versions__media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

/* ---------- Seasons / honor ---------- */
.page-about .about-honor {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  align-items: start;
}

.page-about .about-honor__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}

@media (min-width: 880px) {
  .page-about .about-honor {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

/* ---------- Start ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-cta__note {
  max-width: 62ch;
  margin: 18px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 255, .42);
}

.page-about .about-cta__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- Focus & motion ---------- */
.page-about a:focus-visible,
.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-feature,
  .page-about .about-rail__link,
  .page-about .about-ring__legend li,
  .page-about .about-ring__desc {
    transition: none;
  }

  .page-about .about-feature:hover {
    transform: none;
  }
}