.page-about {
  --about-rail-w: 84px;
  --about-gap: 56px;
  --about-sec-gap: 88px;
  background: var(--ink-night);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  padding-bottom: 120px;
  overflow-x: clip;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about a:focus-visible,
.page-about .crew-item:focus-within {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 128px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--note);
}

.page-about .about-crumb a {
  color: var(--note);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-crumb a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

.page-about .crumb-sep {
  color: var(--sketch);
}

.page-about .crumb-now {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 44px;
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 20px 0 0;
  font-size: clamp(38px, 8.4vw, 92px);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero h1 br {
  display: none;
}

.page-about .hero-lede {
  margin: 28px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--button-text);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 56px 0 0;
  background: var(--pitch);
  border-top: 1px solid var(--pitch);
  border-bottom: 1px solid var(--pitch);
}

.page-about .hero-stats > div {
  background: var(--ink-night);
  padding: 20px 16px 20px 14px;
}

.page-about .hero-stats dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--note);
}

.page-about .hero-stats dd {
  margin: 8px 0 0;
}

.page-about .hero-stats .num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 300;
  line-height: 1;
  color: var(--gold-soft);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-wrap {
  margin-top: 96px;
}

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

.page-about .about-rule {
  height: 1px;
  margin: var(--about-sec-gap) 0;
  background: var(--gold);
  opacity: .3;
  transform: rotate(-1.1deg);
  transform-origin: left center;
}

.page-about .sec {
  padding-top: 0;
}

.page-about .sec-head {
  margin-bottom: 40px;
}

.page-about .sec-index {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--note);
}

.page-about .sec-index .num {
  color: var(--gold);
  letter-spacing: .06em;
}

.page-about .sec h2 {
  margin: 16px 0 0;
  max-width: 22ch;
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .lede-text {
  margin: 0 0 36px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--button-text);
}

/* ---------- 起点 ---------- */
.page-about .start-text p {
  margin: 0 0 20px;
  max-width: 42ch;
  line-height: 1.9;
  color: var(--button-text);
}

.page-about .start-text p:last-child {
  margin-bottom: 0;
}

.page-about .quote {
  margin: 32px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--gold);
  font-size: 17px;
  line-height: 1.85;
  color: var(--gold-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 44px;
}

.page-about .figure-plate {
  position: relative;
  overflow: hidden;
  background: var(--board);
}

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

.page-about .figure-plate::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 31, 26, .12), rgba(5, 13, 11, .5));
  pointer-events: none;
}

.page-about .about-figure figcaption {
  margin-top: 14px;
}

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

.page-about .tl-item {
  position: relative;
  padding-bottom: 56px;
}

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

.page-about .tl-year {
  margin: 0 0 12px;
  font-family: var(--cond);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1;
  color: var(--gold);
}

.page-about .tl-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--note);
}

.page-about .tl-title {
  margin: 10px 0 12px;
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .tl-content > p {
  margin: 0 0 14px;
  max-width: 46ch;
  line-height: 1.9;
  color: var(--button-text);
}

.page-about .tl-content .annot {
  margin-top: 16px;
  max-width: 46ch;
}

.page-about .tl-item:target .tl-title {
  color: var(--gold-soft);
}

.page-about .tl-item--now .tl-year::after {
  content: "";
  display: block;
  width: 8px;
  height: 8px;
  margin-top: 10px;
  background: var(--cyan);
}

/* ---------- 完整率 ---------- */
.page-about .rate-block {
  margin-top: 64px;
  padding: 28px 22px;
  background: var(--board);
  border: 1px solid var(--pitch);
}

.page-about .rate-title {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .rate-sub {
  margin: 8px 0 24px;
}

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

.page-about .rate-row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 58px;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}

.page-about .rate-year {
  font-family: var(--cond);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--note);
}

.page-about .rate-track {
  display: block;
  height: 6px;
  background: var(--pitch);
}

.page-about .rate-fill {
  display: block;
  height: 100%;
  width: 95%;
  background: linear-gradient(90deg, var(--sketch), var(--gold));
  transition: background .18s var(--ease);
}

.page-about .rate-row:hover .rate-fill {
  background: var(--gold);
}

.page-about .rate-row--key .rate-year {
  color: var(--data);
}

.page-about .rate-row--key .rate-fill {
  background: linear-gradient(90deg, var(--sketch), var(--data));
}

.page-about .rate-val {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  text-align: right;
  color: var(--paper);
}

.page-about .rate-foot {
  margin: 22px 0 0;
  max-width: 48ch;
}

/* ---------- 字段 ---------- */
.page-about .field-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

.page-about .field-card {
  padding: 24px 22px 26px;
  background: var(--board);
  border: 1px solid var(--pitch);
}

.page-about .field-id {
  margin: 0 0 14px;
  font-family: var(--cond);
  font-size: 13px;
  letter-spacing: .3em;
  color: var(--gold);
}

.page-about .field-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .field-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--note);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crew-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 20px;
  margin-bottom: 12px;
  background: var(--board);
  border: 1px solid var(--pitch);
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .crew-item:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .crew-idx {
  padding-top: 5px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .crew-body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .crew-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--note);
}

/* ---------- 共建 ---------- */
.page-about .eco {
  list-style: none;
  margin: 0 0 48px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .eco li {
  padding-top: 18px;
  border-top: 1px solid var(--pitch);
}

.page-about .eco-num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  font-weight: 300;
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .eco-label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .eco li p {
  margin: 10px 0 0;
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--note);
}

.page-about .eco + .about-figure {
  margin-top: 8px;
}

/* ---------- 更正 ---------- */
.page-about .fix-list {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
}

.page-about .fix-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--pitch);
}

.page-about .fix-list li:last-child {
  border-bottom: 1px solid var(--pitch);
}

.page-about .fix-num {
  padding-top: 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .fix-list p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--button-text);
}

.page-about .fix-list strong {
  font-weight: 600;
  color: var(--paper);
}

.page-about .fix-cta {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--button-text);
}

.page-about .fix-cta a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--pitch);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .fix-cta a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

/* ---------- 继续看 ---------- */
.page-about .about-next {
  margin-top: 96px;
}

.page-about .about-next-label {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--note);
}

.page-about .about-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--pitch);
}

.page-about .about-next-list a {
  display: block;
  padding: 18px 16px;
  background: var(--ink-night);
  color: var(--paper);
  font-size: 15px;
  text-decoration: none;
  transition: color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-next-list a:hover {
  color: var(--gold-soft);
  background: var(--board);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero h1 br {
    display: inline;
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 72px;
  }
}

@media (min-width: 720px) {
  .page-about .about-shell {
    padding-inline: 40px;
  }

  .page-about .field-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .field-card:nth-child(even) {
    transform: translateY(26px);
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    column-gap: 40px;
    padding-bottom: 72px;
  }

  .page-about .tl-year {
    margin-bottom: 0;
    font-size: 38px;
    text-align: right;
    padding-right: 24px;
    border-right: 1px solid var(--pitch);
  }

  .page-about .tl-item--now .tl-year::after {
    margin-left: auto;
  }

  .page-about .eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

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

@media (min-width: 960px) {
  .page-about .start-grid {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .quote {
    margin-top: 52px;
  }

  .page-about .crew-item {
    width: 74%;
  }

  .page-about .crew-item:nth-child(2) {
    margin-left: 8%;
  }

  .page-about .crew-item:nth-child(3) {
    margin-left: 16%;
  }

  .page-about .crew-item:nth-child(4) {
    margin-left: 24%;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    padding-inline: 56px;
  }

  .page-about .hero-lede {
    margin-left: 28%;
    max-width: 40ch;
  }

  .page-about .about-wrap {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
    margin-top: 112px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 140px;
  }

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

/* ---------- 索引轨道 ---------- */
.page-about .rail-head {
  margin: 0 0 18px;
  font-family: var(--cond);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--note);
}

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

.page-about .rail-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--sketch);
}

.page-about .rail-item a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  text-decoration: none;
  color: var(--note);
}

.page-about .rail-dot {
  position: relative;
  z-index: 1;
  flex: none;
  width: 11px;
  height: 11px;
  border: 1px solid var(--sketch);
  background: var(--board);
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .rail-year {
  font-family: var(--cond);
  font-size: 12px;
  letter-spacing: .12em;
  transition: color .18s var(--ease);
}

.page-about .rail-item a:hover .rail-dot {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .rail-item a:hover .rail-year {
  color: var(--gold-soft);
}

.page-about .rail-item--now .rail-dot {
  background: var(--cyan);
  border-color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .crew-item:hover {
    transform: none;
  }
}