.page-about {
  --about-gap: clamp(20px, 4vw, 34px);
  --about-ink: rgba(244, 240, 230, .80);
  --about-ink-soft: rgba(244, 240, 230, .62);
  --about-panel: linear-gradient(150deg, rgba(30, 90, 71, .46), rgba(7, 28, 23, .88));
  display: block;
  width: 100%;
  overflow-x: clip;
}

.page-about .shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block-start: clamp(18px, 4vw, 34px);
}

/* ---------- 页首 ---------- */
.page-about .about-crumb {
  margin-bottom: clamp(14px, 3vw, 22px);
}

.page-about .about-head {
  position: relative;
  padding-block: clamp(20px, 4vw, 40px) clamp(28px, 5vw, 56px);
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 39, 0) 78%);
}

.page-about .page-head__kicker {
  margin: 0 0 12px;
  font-size: var(--fs-12);
  letter-spacing: .20em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .page-head__title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(30px, 6.2vw, 58px);
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--ivory);
  max-width: 20ch;
}

.page-about .page-head__lede {
  margin: 0;
  max-width: 66ch;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--about-ink);
}

.page-about .about-head__meta {
  list-style: none;
  margin: clamp(20px, 4vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-head__meta li {
  background: var(--night);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-head__metaKey {
  font-size: var(--fs-12);
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .about-head__metaVal {
  font-family: var(--font-head);
  font-size: var(--fs-18);
  letter-spacing: .08em;
  color: var(--gold-pale);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  border-top: 1px solid var(--line);
  padding-block: clamp(34px, 6vw, 78px);
}

.page-about .section__head {
  display: grid;
  gap: 8px;
  margin-bottom: var(--about-gap);
}

.page-about .section__index {
  font-family: var(--font-head);
  font-size: clamp(18px, 3vw, 26px);
  letter-spacing: .14em;
  color: var(--gold);
  line-height: 1;
}

.page-about .section__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 4.4vw, 40px);
  line-height: 1.25;
  color: var(--ivory);
  max-width: 24ch;
}

.page-about .section__note {
  margin: 0;
  max-width: 64ch;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

@media (min-width: 900px) {
  .page-about .section__head {
    grid-template-columns: 90px minmax(0, 1fr);
    column-gap: clamp(20px, 4vw, 44px);
    align-items: start;
  }
  .page-about .section__index { grid-row: 1 / span 2; padding-top: 6px; }
  .page-about .section__title,
  .page-about .section__note { grid-column: 2; }
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  margin: 0;
  border: 1px solid var(--line-mid);
  background: var(--club);
  overflow: hidden;
}

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

.page-about .media__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--about-ink-soft);
}

.page-about .about-heroMedia {
  margin-bottom: clamp(24px, 5vw, 44px);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: clamp(20px, 4vw, 42px);
}

.page-about .timeline-rail__label {
  margin: 0 0 10px;
  font-size: var(--fs-12);
  letter-spacing: .20em;
  color: var(--mist);
}

.page-about .timeline-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .timeline-node {
  display: block;
  padding: 8px 12px;
  border: 1px solid var(--line-mid);
  text-decoration: none;
  font-size: var(--fs-14);
  color: var(--about-ink);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .timeline-node__year {
  font-family: var(--font-head);
  letter-spacing: .12em;
  color: var(--gold);
  margin-right: 8px;
}

.page-about .timeline-node:hover {
  border-color: var(--gold);
  color: var(--gold-pale);
}

.page-about .timeline-node:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .timeline-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 3vw, 22px);
}

.page-about .timeline-item {
  position: relative;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  background: var(--about-panel);
  box-shadow: var(--shadow-hard);
  padding: clamp(16px, 3vw, 24px);
  scroll-margin-top: calc(var(--header-h) + 24px);
  min-width: 0;
}

.page-about .timeline-item__year {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: var(--fs-24);
  letter-spacing: .16em;
  color: var(--gold);
  line-height: 1;
}

.page-about .timeline-item__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-18);
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .timeline-item__text {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-ink);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: 214px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .timeline-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }
  .page-about .timeline-rail__list {
    flex-direction: column;
    gap: 0;
    border-left: 2px solid var(--line-mid);
  }
  .page-about .timeline-node {
    position: relative;
    padding: 12px 10px 12px 22px;
    border: 0;
  }
  .page-about .timeline-node::before {
    content: "";
    position: absolute;
    left: -7px;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--club);
    border: 2px solid var(--gold);
    transition: background .2s var(--ease);
  }
  .page-about .timeline-node__year {
    display: block;
    margin: 0 0 3px;
    font-size: var(--fs-18);
  }
  .page-about .timeline-node__text {
    display: block;
    font-size: var(--fs-14);
    line-height: 1.6;
    color: var(--about-ink-soft);
  }
  .page-about .timeline-node:hover::before { background: var(--gold); }
}

/* ---------- 分区 ---------- */
.page-about .zone-layout {
  display: grid;
  gap: clamp(20px, 4vw, 38px);
}

.page-about .zone-hive {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .zone-chip {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line-mid);
  background: rgba(11, 43, 36, .74);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .zone-chip:nth-child(3),
.page-about .zone-chip:nth-child(5) { margin-top: 20px; }

.page-about .zone-chip:nth-child(7) { grid-column: 1 / -1; }

.page-about .zone-chip:hover {
  border-color: var(--line-gold);
  background: rgba(30, 90, 71, .55);
}

.page-about .zone-chip__badge {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--gold);
  color: var(--club);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-16);
  letter-spacing: .06em;
  clip-path: polygon(29% 0, 71% 0, 100% 29%, 100% 71%, 71% 100%, 29% 100%, 0 71%, 0 29%);
}

.page-about .zone-chip__body { min-width: 0; }

.page-about .zone-chip__name {
  margin: 0 0 5px;
  font-family: var(--font-head);
  font-size: var(--fs-18);
  line-height: 1.3;
  color: var(--ivory);
}

.page-about .zone-chip__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--about-ink-soft);
}

@media (min-width: 980px) {
  .page-about .zone-layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .9fr);
    align-items: start;
  }
  .page-about .zone-media { position: sticky; top: calc(var(--header-h) + 26px); }
}

/* ---------- 分段控件 ---------- */
.page-about .about-tabs {
  margin-top: clamp(24px, 4vw, 38px);
  border: 1px solid var(--line-mid);
  background: rgba(7, 28, 23, .66);
}

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line-mid);
}

.page-about .tab {
  flex: 1 1 118px;
  padding: 13px 16px;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--fs-14);
  letter-spacing: .10em;
  color: var(--mist);
  transition: background .2s var(--ease), color .2s var(--ease);
}

.page-about .tab:hover { color: var(--gold-pale); }

.page-about .tab[aria-selected="true"] {
  background: var(--gold);
  color: var(--club);
  font-weight: 600;
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -3px;
}

.page-about .tabpanel { padding: clamp(14px, 3vw, 24px); }

.page-about .tabpanel[hidden] { display: none; }

.page-about .zone-detail {
  margin: 0;
  display: grid;
}

.page-about .zone-detail__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .zone-detail__row:last-child { border-bottom: 0; }

.page-about .zone-detail__key {
  margin: 0;
  font-size: var(--fs-14);
  letter-spacing: .10em;
  color: var(--gold-pale);
}

.page-about .zone-detail__val {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--about-ink);
}

@media (min-width: 760px) {
  .page-about .zone-detail__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ---------- 版本节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: 14px;
}

.page-about .cadence-card {
  padding: clamp(16px, 3vw, 22px);
  border: 1px solid var(--line-mid);
  background: var(--about-panel);
  min-width: 0;
}

.page-about .cadence-card__kicker {
  margin: 0 0 8px;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .cadence-card__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: var(--fs-24);
  line-height: 1.25;
  color: var(--ivory);
}

.page-about .cadence-card__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--about-ink-soft);
}

@media (min-width: 820px) {
  .page-about .cadence { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.page-about .version-bar {
  margin-top: clamp(16px, 3vw, 24px);
  display: grid;
  gap: 14px;
  padding: clamp(16px, 3vw, 26px);
  border: 1px solid var(--line-mid);
  border-top: 3px solid var(--gold);
  background: rgba(18, 24, 22, .6);
}

.page-about .version-bar__label {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .version-bar__code {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(42px, 8vw, 68px);
  line-height: 1;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .version-bar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .copy-btn {
  padding: 9px 16px;
  border: 1px solid var(--line-gold);
  background: transparent;
  color: var(--gold-pale);
  font-family: var(--font-body);
  font-size: var(--fs-14);
  letter-spacing: .10em;
  cursor: pointer;
  transition: background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .copy-btn:hover {
  background: rgba(201, 162, 39, .16);
  border-color: var(--gold);
}

.page-about .copy-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .version-bar__note {
  margin: 0;
  max-width: 74ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .inline-link {
  color: var(--gold-pale);
  text-decoration: underline;
  text-decoration-color: var(--line-gold);
  text-underline-offset: 4px;
}

.page-about .inline-link:hover { color: var(--gold); }

.page-about .inline-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

@media (min-width: 900px) {
  .page-about .version-bar {
    grid-template-columns: auto minmax(0, auto) minmax(0, 1fr);
    align-items: center;
    column-gap: clamp(18px, 3vw, 32px);
  }
  .page-about .version-bar__label { grid-column: 1; }
  .page-about .version-bar__code { grid-column: 1; grid-row: 2; }
  .page-about .version-bar__actions { grid-column: 2; grid-row: 1 / span 2; }
  .page-about .version-bar__note { grid-column: 3; grid-row: 1 / span 2; }
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(20px, 4vw, 38px);
}

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

.page-about .team-row {
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(7, 28, 23, .6);
  min-width: 0;
}

.page-about .team-row:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .team-row__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .team-row__role {
  font-family: var(--font-head);
  font-size: var(--fs-18);
  color: var(--ivory);
}

.page-about .team-row__count {
  font-family: var(--font-head);
  font-size: var(--fs-18);
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .team-row__track {
  margin-top: 10px;
  height: 8px;
  background: rgba(155, 170, 164, .18);
  overflow: hidden;
}

.page-about .team-row__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--felt-bright), var(--gold));
}

.page-about .team-row--edit .team-row__fill { width: 33.4%; }
.page-about .team-row--proof .team-row__fill { width: 16.7%; }
.page-about .team-row--service .team-row__fill { width: 50%; }

.page-about .team-row__duty {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--about-ink-soft);
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
  .page-about .team-row__duty {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height .24s var(--ease), opacity .24s var(--ease), margin-top .24s var(--ease);
  }
  .page-about .team-row:hover .team-row__duty,
  .page-about .team-row:focus .team-row__duty,
  .page-about .team-row:focus-within .team-row__duty {
    max-height: 140px;
    opacity: 1;
    margin-top: 10px;
  }
}

/* ---------- 规模数字 ---------- */
.page-about .scale-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .scale-item {
  background: var(--night);
  padding: clamp(16px, 3vw, 26px);
  display: grid;
  gap: 8px;
  align-content: start;
  min-width: 0;
}

.page-about .scale-item__num {
  font-family: var(--font-head);
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1;
  letter-spacing: .10em;
  color: var(--gold-pale);
}

.page-about .scale-item__unit {
  font-size: .46em;
  letter-spacing: .06em;
  color: var(--gold);
  margin-left: 4px;
}

.page-about .scale-item__label {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--about-ink-soft);
}

@media (min-width: 900px) {
  .page-about .scale-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 下一步入口 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 14px;
}

.page-about .next-card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(16px, 3vw, 22px);
  border: 1px solid var(--line-mid);
  background: var(--about-panel);
  color: inherit;
  text-decoration: none;
  min-width: 0;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

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

.page-about .next-card:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.page-about .next-card__kicker {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .next-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: var(--fs-18);
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .next-card__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .next-card__arrow {
  font-size: var(--fs-14);
  letter-spacing: .08em;
  color: var(--gold-pale);
}

@media (min-width: 760px) {
  .page-about .next-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1100px) {
  .page-about .next-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
  .page-about .next-card:hover { transform: none; }
  .page-about .team-row__duty { max-height: none; opacity: 1; margin-top: 10px; }
}
</final>