.page-about {
  --about-rail: 96px;
  --about-band-min: 52px;
  --about-pad-y: clamp(30px, 4.5vw, 54px);
  background: var(--oy-cream);
  color: var(--oy-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 3.4vw, 36px) clamp(30px, 4.6vw, 58px);
  background: var(--oy-cream);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(60%, 740px);
  height: 68%;
  background: linear-gradient(152deg, rgba(15, 46, 76, 0.08), rgba(46, 107, 79, 0.12));
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--oy-navy) 0 44%, var(--oy-green) 44% 100%);
  pointer-events: none;
}

.page-about .about-hero .oy-crumbs {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  align-items: end;
  margin-top: clamp(18px, 3vw, 34px);
}

.page-about .about-kicker {
  margin: 0 0 10px;
  font-family: var(--oy-mono);
  font-size: var(--oy-fs-1);
  letter-spacing: 0.09em;
  color: var(--oy-taupe);
}

.page-about .about-hero__lead .oy-h1 {
  margin-top: 0;
  color: var(--oy-navy);
}

.page-about .about-hero__lead .oy-lede {
  max-width: 34em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 1px;
  background: var(--oy-sand);
  border: 1px solid var(--oy-sand);
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  background: var(--oy-cream);
}

.page-about .about-hero__facts li > span:first-child {
  font-family: var(--oy-mono);
  font-size: var(--oy-fs-3);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--oy-navy);
}

.page-about .about-hero__facts li > span:last-child {
  font-size: var(--oy-fs-1);
  color: var(--oy-taupe);
}

.page-about .about-stats {
  padding: clamp(18px, 2.2vw, 26px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-stats .oy-panel__eyebrow {
  margin: 0;
}

.page-about .about-stats .oy-panel__title {
  margin: 6px 0 0;
  color: var(--oy-cream);
}

.page-about .about-stats__list {
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-stats__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(244, 237, 225, 0.18);
}

.page-about .about-stats__list > div:last-child {
  border-bottom: 0;
}

.page-about .about-stats__list dt {
  font-size: var(--oy-fs-2);
  color: rgba(244, 237, 225, 0.76);
}

.page-about .about-stats__list dd {
  margin: 0;
  font-size: var(--oy-fs-3);
  font-weight: 700;
  color: var(--oy-cream);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__note {
  margin: 14px 0 0;
  font-size: var(--oy-fs-1);
  line-height: 1.7;
  color: rgba(244, 237, 225, 0.66);
}

/* ---------- 编年长卷 ---------- */
.page-about .about-chronicle {
  background: var(--oy-cream);
  padding-block: clamp(18px, 2.8vw, 34px) clamp(36px, 5vw, 64px);
}

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

.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  column-gap: clamp(14px, 2vw, 28px);
  padding-block: var(--about-pad-y);
  margin: 0;
}

.page-about .about-sec__rail {
  display: none;
  position: relative;
}

.page-about .about-sec__rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  transform: translateX(-0.5px);
  background: linear-gradient(180deg, var(--oy-green-soft), var(--oy-sand));
  opacity: 0.62;
}

.page-about .about-mark {
  position: absolute;
  top: clamp(38px, 5.4vw, 62px);
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 26px;
  display: grid;
  place-items: center;
  text-decoration: none;
  z-index: 2;
}

.page-about .about-mark > span {
  display: block;
  width: 13px;
  height: 13px;
  background: var(--oy-green);
  border-radius: 0;
  transition: transform 0.2s var(--oy-ease);
}

.page-about .about-mark--open > span {
  background: var(--oy-sand);
  box-shadow: inset 0 0 0 2px var(--oy-taupe);
}

.page-about .about-mark:hover > span,
.page-about .about-mark:focus-visible > span {
  transform: scale(1.18);
}

.page-about .about-sec__code {
  position: absolute;
  top: clamp(70px, 9vw, 94px);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--oy-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--oy-taupe);
  white-space: nowrap;
}

.page-about .about-sec__body {
  min-width: 0;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding-bottom: 10px;
  margin-bottom: clamp(16px, 2.2vw, 24px);
  border-bottom: 2px solid var(--oy-navy);
}

.page-about .about-sec__head .oy-h2 {
  margin: 0;
  color: var(--oy-ink);
}

.page-about .oy-section__no {
  font-family: var(--oy-mono);
  font-size: var(--oy-fs-2);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--oy-taupe);
  transition: color 0.25s var(--oy-ease);
}

.page-about .oy-section.is-active .oy-section__no,
.page-about .oy-section:target .oy-section__no {
  color: var(--oy-navy);
}

.page-about .about-sec__body p {
  margin: 0 0 1em;
}

.page-about .about-sec__body > .oy-prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 色带 ---------- */
.page-about .about-band {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  min-height: var(--about-band-min);
  padding: 14px clamp(16px, 2.4vw, 28px);
  background: var(--oy-navy);
  color: var(--oy-cream);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 62%;
  background-image: repeating-linear-gradient(
    96deg,
    rgba(143, 179, 163, 0.3) 0 1px,
    transparent 1px 16px
  );
  pointer-events: none;
  z-index: 1;
}

.page-about .about-band__no,
.page-about .about-band__text {
  position: relative;
  z-index: 2;
}

.page-about .about-band__no {
  font-family: var(--oy-mono);
  font-size: var(--oy-fs-1);
  letter-spacing: 0.08em;
  color: var(--oy-ochre);
}

.page-about .about-band__text {
  font-size: var(--oy-fs-2);
  color: rgba(244, 237, 225, 0.88);
}

.page-about .about-band--art {
  min-height: clamp(104px, 15vw, 156px);
  align-items: flex-end;
  padding-block: 18px;
}

.page-about .about-band--art > img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.34;
  filter: saturate(0.45) contrast(1.05);
}

/* ---------- 配图 ---------- */
.page-about .about-fig {
  margin: clamp(20px, 3vw, 30px) 0;
}

.page-about .about-fig .oy-figure__frame {
  overflow: hidden;
}

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

.page-about .about-fig--narrow {
  max-width: 100%;
}

/* ---------- 字段对照表 ---------- */
.page-about .about-diff {
  margin-top: clamp(20px, 3vw, 30px);
  border: 1px solid var(--oy-sand);
  background: var(--oy-cream-deep);
  overflow-x: auto;
}

.page-about .about-diff__caption {
  padding: 12px 14px 10px;
  text-align: left;
  font-family: var(--oy-sans);
  font-weight: 700;
  font-size: var(--oy-fs-2);
  color: var(--oy-navy);
  border-bottom: 1px solid var(--oy-sand);
}

.page-about .about-diff__table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: var(--oy-fs-2);
}

.page-about .about-diff__table th,
.page-about .about-diff__table td {
  padding: 11px 14px;
  text-align: right;
  vertical-align: top;
  border-bottom: 1px solid var(--oy-sand);
}

.page-about .about-diff__table thead th {
  font-family: var(--oy-sans);
  font-weight: 700;
  font-size: var(--oy-fs-1);
  letter-spacing: 0.04em;
  color: var(--oy-cream);
  background: var(--oy-navy);
  border-bottom: 2px solid var(--oy-ochre);
}

.page-about .about-diff__table thead th:first-child {
  text-align: left;
}

.page-about .about-diff__table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--oy-ink);
  white-space: nowrap;
  background: rgba(218, 210, 196, 0.3);
}

.page-about .about-diff__table tr.is-changed th {
  border-left: 3px solid var(--oy-ochre);
}

.page-about .about-diff__table td.oy-num {
  font-family: var(--oy-mono);
  font-variant-numeric: tabular-nums;
  color: var(--oy-navy);
}

.page-about .about-diff__note {
  margin: 0;
  padding: 12px 14px 14px;
  font-size: var(--oy-fs-1);
  line-height: 1.7;
  color: var(--oy-taupe);
}

/* ---------- 工序 ---------- */
.page-about .about-steps {
  list-style: none;
  counter-reset: none;
  margin: clamp(16px, 2.4vw, 24px) 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--oy-sand);
  border: 1px solid var(--oy-sand);
}

.page-about .about-steps__item {
  background: var(--oy-cream);
  padding: 16px clamp(14px, 2vw, 22px);
  border-left: 4px solid var(--oy-green);
}

.page-about .about-steps__no {
  display: block;
  font-family: var(--oy-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--oy-ochre);
  margin-bottom: 4px;
}

.page-about .about-steps__item .oy-h3 {
  margin: 0 0 8px;
  color: var(--oy-navy);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: var(--oy-fs-2);
  line-height: 1.75;
  color: var(--oy-taupe);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  padding: 16px clamp(14px, 2vw, 20px);
  background: var(--oy-cream-deep);
  border-left: 4px solid var(--oy-green);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 13px), calc(100% - 13px) 100%, 0 100%);
}

.page-about .about-team__role {
  font-family: var(--oy-sans);
  font-weight: 700;
  font-size: var(--oy-fs-3);
  color: var(--oy-navy);
}

.page-about .about-team__n {
  font-family: var(--oy-mono);
  font-weight: 700;
  font-size: var(--oy-fs-4);
  font-variant-numeric: tabular-nums;
  color: var(--oy-ink);
  text-align: right;
  line-height: 1.2;
}

.page-about .about-team__n::after {
  content: " 人";
  font-family: var(--oy-sans);
  font-size: var(--oy-fs-1);
  font-weight: 500;
  color: var(--oy-taupe);
}

.page-about .about-team__bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  margin-top: 6px;
  background: var(--oy-green);
  opacity: 0.6;
}

.page-about .about-team li:nth-child(1) .about-team__bar { width: 42%; }
.page-about .about-team li:nth-child(2) .about-team__bar { width: 32%; }
.page-about .about-team li:nth-child(3) .about-team__bar { width: 26%; }

.page-about .about-team__desc {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  font-size: var(--oy-fs-2);
  line-height: 1.72;
  color: var(--oy-taupe);
}

/* ---------- 编年刻度 ---------- */
.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--oy-sand);
}

.page-about .about-timeline li {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--oy-ochre);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%);
}

.page-about .about-timeline li.is-open::before {
  background: var(--oy-sand);
}

.page-about .about-timeline__code {
  display: block;
  font-family: var(--oy-mono);
  font-size: var(--oy-fs-1);
  letter-spacing: 0.04em;
  color: var(--oy-navy);
  margin-bottom: 3px;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: var(--oy-fs-2);
  line-height: 1.72;
  color: var(--oy-taupe);
}

/* ---------- 页尾收束 ---------- */
.page-about .about-foot {
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 2px solid var(--oy-navy);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
}

.page-about .about-foot__note {
  flex: 1 1 320px;
  margin: 0;
  font-size: var(--oy-fs-2);
  line-height: 1.75;
  color: var(--oy-taupe);
}

.page-about .about-foot__note a {
  color: var(--oy-crimson);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-foot__note a:hover,
.page-about .about-foot__note a:focus-visible {
  color: var(--oy-navy);
}

/* ---------- 窄屏 ---------- */
@media (max-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-sec__rail {
    display: none;
  }

  .page-about .about-band--art {
    min-height: 92px;
  }
}

@media (min-width: 901px) {
  .page-about .about-sec {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-sec__rail {
    display: block;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.88fr);
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__facts li {
    padding: 10px 12px;
  }

  .page-about .about-band {
    padding-inline: 16px;
  }

  .page-about .about-team li {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mark > span,
  .page-about .oy-section__no {
    transition: none;
  }
}