.page-about {
  --about-rail-w: 172px;
  padding-top: 72px;
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-crumbs {
  padding-top: 18px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .breadcrumb__link {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--teal);
  border-bottom-color: currentColor;
}

.page-about .breadcrumb__current {
  color: var(--moss);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(34px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(240, 198, 116, 0.28) 0%, rgba(240, 198, 116, 0) 58%),
    linear-gradient(180deg, var(--mist) 0%, var(--mist) 72%, rgba(231, 233, 230, 0.5) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .about-hero .lede {
  max-width: 34em;
  margin: 0 0 26px;
  font-family: var(--font-serif);
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-about .about-fact__label {
  font-family: var(--font-display);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--stone);
}

/* 档案封面视觉 */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 26px 52px -42px rgba(14, 22, 34, 0.65);
}

.page-about .about-cover::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(225deg, var(--mist) 0 50%, rgba(22, 35, 58, 0.12) 50% 100%);
  border-bottom-left-radius: 12px;
}

.page-about .about-cover__top,
.page-about .about-cover__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--stone);
}

.page-about .about-cover__top .num,
.page-about .about-cover__count {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.page-about .about-cover__years {
  margin: 18px 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-cover__years li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cover__years .num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--stone);
}

.page-about .about-cover__years i {
  display: block;
  height: 8px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, rgba(79, 111, 90, 0.55), rgba(79, 111, 90, 0.14));
}

.page-about .about-cover__years li:nth-child(2) i { width: 34%; }
.page-about .about-cover__years li:nth-child(3) i { width: 52%; }
.page-about .about-cover__years li:nth-child(4) i { width: 66%; }
.page-about .about-cover__years li:nth-child(5) i { width: 82%; }
.page-about .about-cover__years li:nth-child(6) i {
  width: 100%;
  background: linear-gradient(90deg, var(--amber), var(--gold));
}

/* ---------- 主体栅格：左侧年份轴 ---------- */
.page-about .about-shell {
  padding-bottom: clamp(48px, 7vw, 84px);
}

.page-about .about-rail {
  padding-top: 14px;
  margin-bottom: 30px;
  border-top: 2px solid var(--moss);
}

.page-about .about-rail__label {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .about-rail__list {
  display: flex;
  gap: 16px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--moss);
  border-bottom-color: var(--moss);
}

.page-about .about-rail__note {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--moss);
}

/* ---------- 通用文本 ---------- */
.page-about .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-about .about-h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-about .about-h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--fs-17);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-p {
  max-width: 36em;
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-stream > .about-sec {
  margin-bottom: clamp(46px, 6vw, 76px);
}

.page-about .about-stream > .about-sec:last-child {
  margin-bottom: 0;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-note {
  align-self: start;
  padding: 18px 18px 16px 20px;
  background: var(--paper);
  border-left: 3px solid var(--moss);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-note__quote {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: var(--fs-21);
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-note__text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  background: var(--paper);
  object-fit: cover;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 28px;
  scroll-margin-top: 96px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--moss);
  border-radius: 50%;
  background: var(--mist);
}

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

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__item:target::after {
  border-color: var(--amber);
  background: var(--gold);
}

.page-about .about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  color: var(--ink);
}

.page-about .about-timeline__body .about-p {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__tabs {
  position: relative;
  display: flex;
  gap: 4px;
  margin: 26px 0 0;
  padding-bottom: 2px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-strong);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-team__tabs .segmented__btn {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 10px 14px;
  border: 0;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: transparent;
  font-family: var(--font-display);
  font-size: var(--fs-14);
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  transition: color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .about-team__tabs .segmented__btn:hover {
  color: var(--ink);
  background: rgba(247, 245, 239, 0.7);
}

.page-about .about-team__tabs .segmented__btn[aria-selected="true"] {
  color: var(--ink);
  font-weight: 700;
  background: var(--paper);
}

.page-about .about-team__panels {
  padding-top: 20px;
}

.page-about .about-team__panel {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .about-tick {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tick li {
  position: relative;
  padding: 8px 0 8px 20px;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-tick li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 10px;
  height: 1px;
  background: var(--amber);
}

/* ---------- 校对流程 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 16px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .about-steps__no {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  line-height: 1;
  color: var(--moss);
}

.page-about .about-steps__item .about-p {
  margin-bottom: 0;
  font-size: var(--fs-14);
}

/* ---------- 规模数字带 ---------- */
.page-about .about-scale {
  padding: clamp(24px, 4vw, 44px);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(47, 126, 119, 0.35) 0%, rgba(14, 22, 34, 0) 62%),
    var(--night);
  border-radius: var(--radius-lg);
  color: var(--paper);
}

.page-about .about-scale__title {
  margin-bottom: 8px;
  color: var(--paper);
}

.page-about .about-scale__intro {
  margin: 0 0 24px;
  max-width: 30em;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(247, 245, 239, 0.72);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--line-light);
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  line-height: 1.1;
  color: var(--gold);
}

.page-about .about-scale__label {
  font-family: var(--font-display);
  font-size: var(--fs-12);
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: rgba(247, 245, 239, 0.72);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 24px;
  margin-top: 24px;
}

.page-about .about-partners__col--paper {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .about-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-list__item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-list__num {
  font-family: var(--font-mono);
  font-size: var(--fs-21);
  line-height: 1.2;
  color: var(--moss);
}

.page-about .about-list__title {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--ink);
}

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

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  padding: clamp(22px, 4vw, 36px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 22px 44px -42px rgba(14, 22, 34, 0.6);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta__actions .btn {
  min-height: 44px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 6fr;
    align-items: end;
    gap: 44px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) 236px;
    gap: 38px;
  }

  .page-about .about-note {
    margin-top: 34px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .about-figure--narrow {
    max-width: 640px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-rail-w: 172px;
  }

  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    margin-bottom: 0;
  }

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

  .page-about .about-rail__link {
    width: 100%;
  }

  .page-about .about-timeline__item {
    padding-left: 34px;
  }

  .page-about .about-timeline__item::before {
    left: 6px;
  }

  .page-about .about-scale__grid {
    gap: 26px 28px;
  }

  .page-about .about-team__panel {
    padding: 24px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-team__tabs .segmented__btn {
    transition: none;
  }
}