.page-about {
  --about-num: clamp(38px, 7vw, 88px);
  --about-num-col: 92px;
  padding-bottom: clamp(32px, 6vw, 72px);
}

.page-about .breadcrumb {
  margin-top: clamp(14px, 2vw, 24px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--gap);
  padding: clamp(18px, 3vw, 32px) 0 clamp(24px, 4vw, 48px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 52px);
  line-height: 1.14;
  letter-spacing: 0.06em;
  color: var(--paper-050);
  margin: 8px 0 16px;
  max-width: 22ch;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-050);
  opacity: 0.92;
  max-width: 62ch;
  margin: 0 0 20px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-600);
  border: var(--line-thick);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stat {
  background: var(--panel-700);
  padding: 14px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: -0.02em;
}

.page-about .about-stat__unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--cyan-200);
}

.page-about .about-stat__label {
  font-size: 12px;
  color: var(--slate-400);
  letter-spacing: 0.04em;
}

.page-about .about-badge {
  border: var(--line-thick);
  border-top: 3px solid var(--cyan-400);
  background: var(--panel-700);
  box-shadow: var(--shadow-hard);
  padding: 16px;
}

.page-about .about-badge__kicker {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--slate-400);
  margin: 0 0 6px;
}

.page-about .about-badge__version {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 46px);
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: 0.02em;
  margin: 0 0 12px;
}

.page-about .about-badge__stamp-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.page-about .about-badge__note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate-400);
  margin: 0 0 16px;
  padding-top: 12px;
  border-top: var(--line);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: 10px;
  padding: clamp(28px, 5vw, 56px) 0;
  border-top: var(--line);
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: var(--about-num);
  line-height: 0.86;
  color: var(--cyan-400);
  letter-spacing: -0.03em;
  align-self: start;
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(21px, 3.1vw, 34px);
  letter-spacing: 0.05em;
  line-height: 1.25;
  color: var(--paper-050);
  margin: 0 0 14px;
}

.page-about .about-chapter__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper-050);
  margin: 0 0 16px;
  max-width: 64ch;
}

.page-about .about-chapter__body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-050);
  opacity: 0.88;
  margin: 0 0 14px;
  max-width: 66ch;
}

.page-about .about-inline-link {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-400);
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--paper-050);
  border-bottom-color: var(--paper-050);
}

/* ---------- 01 四步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-600);
  border: var(--line-thick);
  max-width: 520px;
}

.page-about .about-steps__item {
  background: var(--panel-700);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  font-size: 14px;
  color: var(--paper-050);
}

.page-about .about-steps__n {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan-400);
  min-width: 18px;
}

/* ---------- 02 团队 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 20px;
}

.page-about .about-role {
  background: var(--panel-700);
  border: var(--line-thick);
  box-shadow: var(--shadow-hard);
  padding: 16px 16px 18px;
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-about .about-role__count {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-900);
  background: var(--cyan-400);
  padding: 2px 7px;
  margin-bottom: 10px;
}

.page-about .about-role__name {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.06em;
  color: var(--paper-050);
  margin: 0 0 8px;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-400);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan-400);
}

/* ---------- 03 版本 ---------- */
.page-about .about-version {
  display: grid;
  gap: var(--gap);
  margin-top: 8px;
}

.page-about .about-version__stamp {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 4px 0 18px;
}

.page-about .about-version__link {
  margin-bottom: 0;
}

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

.page-about .about-figure__media {
  aspect-ratio: 10 / 7;
}

.page-about .about-figure__media--place {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--wide .figure__media {
  aspect-ratio: 21 / 8;
}

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

/* ---------- 04 时间轴 ---------- */
.page-about .about-tl {
  margin-top: 22px;
}

.page-about .about-tl__track {
  position: relative;
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 34px 4px 14px;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-about .about-tl__track::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 4px;
  right: 4px;
  height: 2px;
  background: var(--line-600);
}

.page-about .about-stage {
  position: relative;
  flex: 0 0 min(280px, 76vw);
  scroll-snap-align: start;
  background: var(--panel-700);
  border: var(--line-thick);
  box-shadow: var(--shadow-hard);
  padding: 14px 14px 16px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: -27px;
  left: 18px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber-400);
  box-shadow: 0 0 0 3px var(--ink-800);
}

.page-about .disclosure__btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  width: 100%;
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  padding: 0;
  cursor: pointer;
}

.page-about .disclosure__btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 4px;
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--amber-400);
  letter-spacing: 0.04em;
}

.page-about .about-stage__name {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--paper-050);
  line-height: 1.4;
}

.page-about .about-stage__hint {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate-400);
}

.page-about .disclosure__panel {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--cyan-400);
}

.page-about .disclosure__panel p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate-400);
}

/* ---------- 05 重庆 ---------- */
.page-about .about-place {
  display: grid;
  gap: var(--gap);
  margin-top: 8px;
}

.page-about .about-place__list {
  margin: 0 0 20px;
  border-top: var(--line);
}

.page-about .about-place__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  padding: 10px 0;
  border-bottom: var(--line);
}

.page-about .about-place__row dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate-400);
  align-self: center;
}

.page-about .about-place__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-050);
  word-break: break-word;
}

.page-about .about-place__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.42fr) minmax(280px, 0.82fr);
    align-items: start;
  }

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

  .page-about .about-badge {
    position: sticky;
    top: calc(var(--bar-h) + 18px);
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-num-col) minmax(0, 1fr);
    gap: var(--gap);
  }

  .page-about .about-chapter__num {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 18px;
  }

  .page-about .about-roles .about-role:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-roles .about-role:nth-child(3) {
    margin-top: -8px;
  }

  .page-about .about-roles .about-role:nth-child(4) {
    margin-top: 30px;
  }

  .page-about .about-version {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-place {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-stage {
    flex-basis: 292px;
  }

  .page-about .about-stage:nth-child(2) {
    padding-bottom: 36px;
  }

  .page-about .about-stage:nth-child(3) {
    padding-bottom: 58px;
  }

  .page-about .about-stage:nth-child(4) {
    padding-bottom: 80px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-roles .about-role:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-roles .about-role:nth-child(3) {
    margin-top: 8px;
  }

  .page-about .about-roles .about-role:nth-child(4) {
    margin-top: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within {
    transform: none;
  }
}