.page-about {
  --about-paper-text: #16211C;
  --about-paper-muted: #5B655F;
  --about-paper-line: rgba(11, 14, 13, .16);
  --about-hero-pt: calc(var(--header-h) + 34px);
  display: block;
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: var(--about-hero-pt) 0 clamp(38px, 6vw, 72px);
  background:
    linear-gradient(180deg, rgba(15, 42, 34, .72) 0%, rgba(11, 14, 13, 0) 62%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(58, 74, 67, .32) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(58, 74, 67, .22) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .5;
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__copy .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--lime);
  color: var(--lime);
}

.page-about .about-hero__copy h1 {
  margin: 0 0 20px;
  max-width: 16em;
  font-family: var(--font-display);
  font-size: clamp(32px, 5.2vw, 60px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: #F3F6F2;
}

.page-about .about-hero__copy .lede {
  margin: 0 0 16px;
  max-width: var(--read);
  color: var(--text);
}

.page-about .about-hero__copy .prose {
  max-width: var(--read);
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure .image-frame {
  border: 1px solid var(--line);
  background: var(--pitch);
}

.page-about .about-hero__keyline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__key {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 14px 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__k {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__kl {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */
.page-about .section-index {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .section-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(23px, 3.2vw, 32px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.18;
  color: #F1F4F0;
}

.page-about .section .lede {
  max-width: var(--read);
  margin: 0;
  color: var(--text);
}

.page-about .section .prose {
  max-width: var(--read);
}

/* ---------- 缘起 ---------- */
.page-about .about-origin {
  background: var(--pitch);
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-origin__prose p {
  margin: 0 0 16px;
  color: var(--text);
}

.page-about .about-origin__pillars {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-origin__pillar {
  position: relative;
  padding: 22px 0 22px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__pillar::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 42px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-origin__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-origin__ptitle {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--lime);
}

.page-about .about-origin__pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

/* ---------- 浅色反转区块 ---------- */
.page-about .section--paper {
  background: var(--paper);
  color: var(--about-paper-text);
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .section--paper .section-title {
  color: #101A16;
}

.page-about .section--paper .lede,
.page-about .section--paper .prose {
  color: var(--about-paper-text);
}

.page-about .section--paper .section-index {
  color: #7A5A16;
}

.page-about .section--paper .annotation {
  color: var(--about-paper-muted);
}

.page-about .section--paper .panel {
  border-color: var(--about-paper-line);
  background: rgba(255, 255, 255, .5);
}

.page-about .section--paper .panel__summary {
  color: #101A16;
}

.page-about .section--paper .panel__body {
  color: #2A342E;
}

/* ---------- 编年时间轴 ---------- */
.page-about .chrono {
  position: relative;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--about-paper-line);
}

.page-about .chrono__item {
  position: relative;
  padding-bottom: 10px;
}

.page-about .chrono__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 16px;
  width: 9px;
  height: 9px;
  background: var(--paper);
  border: 1px solid #8C978F;
}

.page-about .chrono__item--current::before {
  background: var(--lime);
  border-color: #6E8A22;
  box-shadow: 0 0 0 4px rgba(200, 255, 61, .3);
}

.page-about .chrono__panel {
  border: 1px solid transparent;
  border-bottom: 1px solid var(--about-paper-line);
  background: transparent;
}

.page-about .chrono__panel[open] {
  border-color: var(--about-paper-line);
  background: rgba(255, 255, 255, .55);
}

.page-about .chrono__season {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: #6A736C;
}

.page-about .chrono__item--current .chrono__season {
  color: #3D5410;
}

.page-about .chrono__label {
  display: block;
  margin-top: 4px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .01em;
  color: #101A16;
}

.page-about .chrono__panel .panel__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: #2A342E;
}

.page-about .chrono__panel .panel__summary {
  padding: 14px 0 14px;
}

.page-about .chrono__panel[open] .panel__summary {
  padding-left: 14px;
  padding-right: 14px;
}

.page-about .chrono__panel[open] .panel__body {
  padding: 0 14px 18px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--teal);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team .section-index {
  color: var(--orange);
}

.page-about .team-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  position: relative;
  padding: 24px 20px 22px;
  background: var(--pitch);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: var(--orange);
  transform: scaleX(.22);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: #12332A;
}

.page-about .team-card:hover::before,
.page-about .team-card:focus-within::before {
  transform: scaleX(1);
}

.page-about .team-card__no {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--orange);
}

.page-about .team-card__name {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #F1F4F0;
}

.page-about .team-card__duty {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .team-card__meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.page-about .team-card__meta dt {
  color: var(--muted);
  font-style: italic;
}

.page-about .team-card__meta dd {
  margin: 0;
  color: var(--text);
  line-height: 1.6;
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-source__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(24px, 3.6vw, 38px);
}

.page-about .source-row {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .source-row__tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .source-row__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: #F1F4F0;
}

.page-about .source-row__scope {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

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

.page-about .about-source__figure .image-frame {
  border: 1px solid var(--line);
  background: var(--pitch);
}

.page-about .about-source__panels {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-source__panels .panel {
  background: var(--pitch);
}

.page-about .about-source__panels .panel__summary {
  color: var(--gold);
}

.page-about .about-source__panels .panel__body p {
  margin: 0 0 12px;
}

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

.page-about .fix-steps {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .fix-steps li::marker {
  color: var(--clay);
  font-family: var(--font-mono);
}

/* ---------- 简史 ---------- */
.page-about .about-history__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(24px, 3.6vw, 38px);
}

.page-about .about-history__copy .prose {
  margin: 0 0 24px;
}

.page-about .history-fields {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .history-field {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .history-field__k {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .06em;
  color: #101A16;
}

.page-about .history-field__v {
  font-size: 14px;
  line-height: 1.7;
  color: #3A443E;
}

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

.page-about .about-history__figure .image-frame {
  border: 1px solid var(--about-paper-line);
  background: #DCD9CE;
}

/* ---------- 年代尺 ---------- */
.page-about .decade {
  display: grid;
  gap: 12px;
  margin-top: clamp(32px, 5vw, 54px);
  padding-top: 22px;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .decade__track {
  padding-bottom: 6px;
}

.page-about .decade__scale {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 720px;
}

.page-about .decade__tick {
  position: relative;
  flex: 1 1 0;
  padding: 26px 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: #6A736C;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .decade__tick::before {
  content: "";
  position: absolute;
  left: 0;
  top: -5px;
  width: 1px;
  height: 9px;
  background: #8C978F;
}

.page-about .decade__tick--last::after {
  content: "";
  position: absolute;
  right: 0;
  top: -1px;
  width: 46%;
  height: 2px;
  background: var(--lime);
}

.page-about .decade__edge {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .decade__edge--end {
  justify-content: flex-start;
}

.page-about .decade__edge-year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: #101A16;
  font-variant-numeric: tabular-nums;
}

.page-about .decade__edge-label {
  font-size: 13px;
  font-style: italic;
  color: var(--about-paper-muted);
}

/* ---------- 服务区域 ---------- */
.page-about .about-region {
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-region__box {
  position: relative;
  padding: clamp(24px, 3.6vw, 40px) clamp(20px, 3vw, 38px) clamp(24px, 3.6vw, 38px);
  background: rgba(20, 58, 47, .5);
  border: 1px solid var(--line);
}

.page-about .about-region__box::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: var(--cobalt);
}

.page-about .about-region__cols {
  display: grid;
  gap: clamp(22px, 3.4vw, 42px);
  margin-top: 18px;
}

.page-about .about-region__cols .prose {
  margin: 0;
}

.page-about .about-region__facts {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 18px;
  margin: 0;
  font-size: 14px;
}

.page-about .about-region__facts dt {
  font-style: italic;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-region__facts dd {
  margin: 0;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-region__facts dd:last-child {
  font-family: var(--font-mono);
  letter-spacing: .02em;
  color: var(--gold);
}

/* ---------- 完成度 ---------- */
.page-about .about-ledger {
  background:
    linear-gradient(180deg, rgba(15, 42, 34, .55) 0%, rgba(11, 14, 13, 0) 70%),
    var(--ink);
}

.page-about .ledger {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .ledger__main {
  position: relative;
  padding: 22px 0 24px 22px;
  border-left: 2px solid var(--lime);
}

.page-about .ledger__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(72px, 15vw, 132px);
  font-weight: 700;
  line-height: .86;
  letter-spacing: -.04em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ledger__cap {
  margin: 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .ledger__side {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ledger__block {
  padding: 20px 18px;
  background: var(--pitch);
}

.page-about .ledger__block--note {
  background: rgba(162, 75, 62, .16);
}

.page-about .ledger__h {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .ledger__block--note .ledger__h {
  color: var(--clay);
}

.page-about .ledger__block p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-ledger__next {
  margin-top: clamp(34px, 5vw, 56px);
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-ledger__next .prose {
  margin: 0 0 20px;
}

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

/* ---------- 共享组件在本页的局部微调 ---------- */
.page-about .image-frame__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  font-style: italic;
  color: var(--muted);
}

.page-about .section--paper .image-frame__caption {
  color: var(--about-paper-muted);
}

.page-about .image-frame__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.page-about .panel__summary {
  font-size: 15px;
  cursor: pointer;
}

.page-about .annotation {
  display: block;
  margin-top: 16px;
  font-size: 12px;
  font-style: italic;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__keyline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-hero__key:last-child {
    border-right: 0;
  }

  .page-about .ledger__side {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .history-field {
    grid-template-columns: 8.5em minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-hero-pt: calc(var(--header-h) + 48px);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: end;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-hero__figure {
    margin-top: 42px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-source__panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-history__figure {
    margin-top: 36px;
  }

  .page-about .about-region__cols {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .ledger {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .ledger__main {
    padding-left: 28px;
  }
}

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

  .page-about .about-origin__grid {
    gap: clamp(48px, 6vw, 84px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .team-card::before {
    transition: none;
  }
}