.page-about {
  --about-line: rgba(169, 188, 196, 0.34);
  --about-line-dark: rgba(220, 229, 231, 0.18);
  --about-soft: rgba(111, 143, 138, 0.16);
  background: var(--paper);
  color: var(--archive);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.page-about * {
  box-sizing: border-box;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.12;
  margin: 0;
}

.page-about p {
  margin: 0 0 1.05em;
}

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

/* ---------- 首屏 ---------- */
.page-about .hero {
  position: relative;
  padding: clamp(22px, 5vw, 46px) 0 clamp(34px, 6vw, 66px);
  background:
    radial-gradient(120% 78% at 88% -10%, var(--about-soft), transparent 62%),
    repeating-linear-gradient(90deg, rgba(169, 188, 196, 0.1) 0 1px, transparent 1px 96px),
    var(--paper);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .breadcrumbs a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 38px);
}

.page-about .hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--teal);
  margin-bottom: 16px;
}

.page-about .hero__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-pill);
  background: var(--ink);
  color: var(--gold-lt);
  font-size: 11px;
  letter-spacing: 0;
}

.page-about .hero h1 {
  font-size: clamp(2.15rem, 8.2vw, 5rem);
  font-weight: 300;
  line-height: 1;
  color: var(--ink);
}

.page-about .hero__intro {
  margin-top: clamp(18px, 3vw, 26px);
  max-width: 54ch;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--ink-2);
}

.page-about .hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .hero__actions .btn {
  text-decoration: none;
}

.page-about .hero__visual {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-2);
  box-shadow: 0 22px 48px rgba(14, 42, 36, 0.16);
}

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

.page-about .hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero__stats li {
  background: var(--paper);
  padding: 16px 18px;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 27px);
  line-height: 1.2;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--teal);
}

/* ---------- 分区与标题组 ---------- */
.page-about .band {
  padding: clamp(44px, 7vw, 92px) 0;
}

.page-about .band--paper {
  background: var(--paper);
}

.page-about .band--mist {
  background: var(--mist);
}

.page-about .band--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .sec-head {
  max-width: 64ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .sec-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .sec-head__title {
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  font-weight: 400;
  color: var(--ink);
}

.page-about .sec-head__note {
  margin-top: 12px;
  font-size: 15px;
  color: var(--teal);
}

.page-about .band--ink .sec-head__title {
  color: var(--paper);
}

.page-about .band--ink .sec-head__note {
  color: var(--haze);
}

/* ---------- 缘起 ---------- */
.page-about .split {
  display: grid;
  gap: clamp(22px, 4vw, 42px);
}

.page-about .prose {
  max-width: 70ch;
  color: var(--archive);
}

.page-about .prose h3 {
  font-size: 1.05rem;
  margin: 1.5em 0 0.5em;
  color: var(--ink);
}

.page-about .prose h3:first-child {
  margin-top: 0;
}

.page-about .split__fig {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: repeating-linear-gradient(135deg, var(--ink-2) 0 9px, #123028 9px 18px);
}

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

.page-about .split__fig figcaption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--haze);
  background: var(--ink);
}

.page-about .flag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 5px 12px;
  border: 1px solid var(--gold);
  border-radius: var(--radius-pill);
  color: var(--ink);
}

/* ---------- 时间轴 ---------- */
.page-about .chrono {
  display: grid;
  gap: 26px;
}

.page-about .chrono__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--teal);
  margin-bottom: 10px;
}

.page-about .chrono__index {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .chrono__index::-webkit-scrollbar {
  display: none;
}

.page-about .chrono__index a {
  display: inline-block;
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--haze);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .chrono__index a:hover,
.page-about .chrono__index a:focus-visible {
  color: var(--gold-lt);
  border-color: var(--gold);
}

.page-about .track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-left: 28px;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--about-line-dark) 8%, var(--about-line-dark) 92%, transparent);
}

.page-about .node {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius-md);
  padding: 18px 18px 14px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .node:hover {
  border-color: rgba(200, 162, 74, 0.55);
}

.page-about [data-reveal] {
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.page-about .node__dot {
  position: absolute;
  left: -24px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(200, 162, 74, 0.14);
}

.page-about .node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .node h3 {
  font-size: clamp(1.05rem, 2.4vw, 1.32rem);
  color: var(--paper);
  margin-bottom: 8px;
}

.page-about .node p {
  font-size: 14.5px;
  color: var(--haze);
  margin-bottom: 10px;
}

.page-about .node__fold {
  border-top: 1px solid var(--about-line-dark);
  padding-top: 10px;
}

.page-about .node__fold .fold__summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-lt);
  transition: color var(--dur) var(--ease);
}

.page-about .node__fold .fold__summary::-webkit-details-marker {
  display: none;
}

.page-about .node__fold .fold__summary::after {
  content: " +";
  color: var(--gold);
}

.page-about .node__fold[open] .fold__summary::after {
  content: " −";
}

.page-about .node__fold .fold__body {
  padding-top: 10px;
}

.page-about .node__fold .fold__body p {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .crew__fig {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: repeating-linear-gradient(135deg, var(--mist) 0 9px, #cdd9dc 9px 18px);
}

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

.page-about .crew__sub {
  font-size: 1.02rem;
  color: var(--ink);
  margin: 0 0 12px;
}

.page-about .crew__sub + .roles + .crew__sub {
  margin-top: 30px;
}

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

.page-about .role {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 6px 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .role__name {
  font-size: 14.5px;
  color: var(--ink-2);
}

.page-about .role__num {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .role__bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--mist);
  overflow: hidden;
}

.page-about .role__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--gold));
}

.page-about .role__fill--9 {
  width: 50%;
}

.page-about .role__fill--5 {
  width: 27.8%;
}

.page-about .role__fill--4 {
  width: 22.2%;
}

.page-about .steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .steps li {
  position: relative;
  padding-left: 52px;
  font-size: 14.5px;
  color: var(--ink-2);
}

.page-about .steps li::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  padding: 3px 8px;
  background: var(--paper);
}

.page-about .steps strong {
  display: block;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

/* ---------- 数据方法 ---------- */
.page-about .ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(14, 42, 36, 0.14);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .ledger__item {
  background: var(--paper);
  padding: clamp(20px, 3.4vw, 30px);
}

.page-about .ledger__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 40px);
  line-height: 1.1;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

.page-about .ledger__title {
  font-size: 1.02rem;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .ledger__item p {
  font-size: 14.5px;
  color: var(--ink-2);
  margin: 0;
}

/* ---------- 覆盖 ---------- */
.page-about .reach {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .reach__stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .reach__item {
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  background: rgba(22, 59, 50, 0.55);
}

.page-about .reach__item dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--haze);
  margin-bottom: 6px;
}

.page-about .reach__item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 4vw, 25px);
  color: var(--gold-lt);
  font-variant-numeric: tabular-nums;
}

.page-about .chart {
  margin: 0;
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius-lg);
  padding: 18px 18px 14px;
  background: rgba(10, 13, 12, 0.28);
}

.page-about .chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .chart__grid {
  fill: none;
  stroke: rgba(169, 188, 196, 0.22);
  stroke-width: 1;
  stroke-dasharray: 3 6;
}

.page-about .chart__area {
  fill: rgba(111, 143, 138, 0.22);
  stroke: none;
}

.page-about .chart__line {
  fill: none;
  stroke: var(--gold);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .chart__dot {
  fill: var(--paper);
  stroke: var(--gold);
  stroke-width: 2;
}

.page-about .chart figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--haze);
}

/* ---------- 合作 ---------- */
.page-about .partners {
  display: grid;
  gap: 16px;
}

.page-about .card {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3.4vw, 28px);
  background: rgba(220, 229, 231, 0.42);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .card:hover {
  border-color: rgba(200, 162, 74, 0.6);
  background: rgba(220, 229, 231, 0.7);
}

.page-about .card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 7vw, 44px);
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}

.page-about .card__title {
  font-size: 1rem;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .card p {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-2);
}

/* ---------- 结尾 ---------- */
.page-about .closing__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  border-top: 1px solid var(--about-line-dark);
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .closing__note {
  margin-top: 12px;
  max-width: 62ch;
  font-size: 15px;
  color: var(--haze);
}

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

.page-about .closing__actions .btn {
  text-decoration: none;
}

.page-about .closing__home {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gold-lt);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 162, 74, 0.5);
  padding-bottom: 2px;
}

.page-about .closing__home:hover {
  border-bottom-color: var(--gold-lt);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .reach__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: end;
  }

  .page-about .split {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .page-about .crew {
    grid-template-columns: 0.92fr 1.08fr;
    align-items: start;
  }

  .page-about .reach {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .page-about .closing__inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
  }

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

@media (min-width: 960px) {
  .page-about .chrono {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .chrono__side {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .chrono__index {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .chrono__index a {
    border: none;
    border-left: 1px solid var(--about-line-dark);
    border-radius: 0;
    padding: 7px 0 7px 14px;
    letter-spacing: 0.14em;
  }

  .page-about .chrono__index a:hover,
  .page-about .chrono__index a:focus-visible {
    border-left-color: var(--gold);
  }

  .page-about .track {
    padding-left: 0;
    gap: 26px;
  }

  .page-about .track::before {
    left: 50%;
  }

  .page-about .node {
    width: calc(50% - 42px);
  }

  .page-about .node:nth-child(odd) {
    align-self: flex-start;
  }

  .page-about .node:nth-child(even) {
    align-self: flex-end;
  }

  .page-about .node:nth-child(odd) .node__dot {
    left: auto;
    right: -47px;
  }

  .page-about .node:nth-child(even) .node__dot {
    left: -47px;
    right: auto;
  }
}

@media (min-width: 1180px) {
  .page-about .hero h1 {
    letter-spacing: 0.005em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .node,
  .page-about [data-reveal],
  .page-about .card,
  .page-about .chrono__index a {
    transition: none;
  }
}