.page-about {
  --about-rail: 216px;
  padding-bottom: 88px;
}

.page-about .about-crumbs {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 30px 0 56px;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
}

.page-about .about-hero__copy {
  max-width: 760px;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
}

.page-about .about-hero .h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-hero .lede {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__cta {
  margin: 28px 0 0;
}

.page-about .about-readout {
  border: 1px solid var(--border);
  background: linear-gradient(150deg, var(--surface) 0%, var(--surface-2) 100%);
  padding: 20px 22px 4px;
}

.page-about .about-readout__cap {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .about-readout__list {
  margin: 0;
  padding: 0;
}

.page-about .about-readout__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.page-about .about-readout__row:last-child {
  border-bottom: 0;
}

.page-about .about-readout__row dt {
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-readout__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  color: var(--text);
  white-space: nowrap;
}

.page-about .about-readout__row .unit {
  margin-left: 5px;
  font-family: var(--font-body);
  font-size: var(--fs-12);
  color: var(--muted);
}

/* ---------- 侧栏 + 正文 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
}

.page-about .about-rail {
  border: 1px solid var(--border);
  background: var(--surface-2);
  padding: 18px 16px 20px;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rail;
}

.page-about .about-rail__list a {
  display: block;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  font-size: var(--fs-14);
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-left-color: var(--accent);
  background: var(--accent-soft);
  color: var(--text);
}

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

/* ---------- 章节 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--masthead-space) + 24px);
}

.page-about .about-section + .about-section {
  margin-top: 72px;
}

.page-about .about-section__head {
  margin: 0 0 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.page-about .about-section__head .eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
}

.page-about .about-section__head .h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-section__lead {
  margin: 0 0 30px;
  max-width: 60ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 三块入口 ---------- */
.page-about .about-board {
  display: grid;
  gap: 1px;
  border: 1px solid var(--border);
  background: var(--border);
}

.page-about .about-board__item {
  background: var(--surface);
  padding: 24px 22px 26px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-board__item:hover,
.page-about .about-board__item:focus-within {
  background: var(--surface-2);
}

.page-about .about-board__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .about-board__item .h3 {
  margin: 0 0 10px;
  font-size: var(--fs-18);
  line-height: 1.42;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-board__item p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 图 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--border);
  background: var(--surface-2);
  overflow: hidden;
}

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

.page-about .about-figure--timeline {
  margin-bottom: 34px;
}

.page-about .about-figure--team {
  margin-bottom: 24px;
}

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

.page-about .about-timeline__node {
  position: relative;
  padding: 0 0 36px 34px;
  border-left: 1px solid var(--border);
}

.page-about .about-timeline__node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 7px;
  width: 8px;
  height: 8px;
  background: var(--steel-strong);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__node:hover::before,
.page-about .about-timeline__node:focus-within::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.page-about .about-timeline__node--now::before {
  background: var(--magenta);
}

.page-about .about-timeline__stamp {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-timeline__node--now .about-timeline__stamp {
  color: var(--magenta);
}

.page-about .about-timeline__body .h3 {
  margin: 0 0 8px;
  font-size: var(--fs-18);
  line-height: 1.42;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 复核步骤 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--border);
  background: var(--border);
}

.page-about .about-steps__item {
  background: var(--surface);
  padding: 22px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-steps__item:hover {
  background: var(--surface-2);
}

.page-about .about-steps__no {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--accent);
}

.page-about .about-steps__item .h3 {
  margin: 0 0 8px;
  font-size: var(--fs-16);
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1px;
  border: 1px solid var(--border);
  background: var(--border);
}

.page-about .about-team__item {
  background: var(--surface);
  padding: 24px 22px 26px;
  border-top: 2px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-team__item:hover,
.page-about .about-team__item:focus-within {
  background: var(--surface-2);
  border-top-color: var(--accent);
}

.page-about .about-team__item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.page-about .about-team__count {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 44px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about .about-team__item .h3 {
  margin: 0 0 10px;
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--text);
}

.page-about .about-team__item p:last-child {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 适配实验室 ---------- */
.page-about .about-labs {
  display: grid;
  gap: 28px;
}

.page-about .about-labs__copy p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-labs__list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-labs__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-labs__dot {
  flex: none;
  width: 6px;
  height: 6px;
  background: var(--accent);
  transform: translateY(-2px);
}

/* ---------- 数据横条 ---------- */
.page-about .about-bars {
  display: grid;
  gap: 26px;
  margin-bottom: 44px;
}

.page-about .about-bar {
  padding: 18px 20px 20px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-bar:hover,
.page-about .about-bar:focus-within {
  border-color: var(--accent);
}

.page-about .about-bar:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-about .about-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .about-bar__name {
  font-size: var(--fs-14);
  color: var(--muted);
}

.page-about .about-bar__value {
  font-family: var(--font-mono);
  font-size: var(--fs-18);
  color: var(--accent);
  white-space: nowrap;
}

.page-about .about-bar__track {
  position: relative;
  height: 8px;
  margin-top: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-press) 100%);
  transition: width 240ms var(--ease);
}

.page-about .about-bar--visits .about-bar__fill {
  width: 86%;
}

.page-about .about-bar--mobile .about-bar__fill {
  width: 60%;
}

.page-about .about-bar--tools .about-bar__fill {
  width: 68%;
  background: linear-gradient(90deg, var(--orange) 0%, var(--action-hover) 100%);
}

.page-about .about-bar__note {
  margin: 10px 0 0;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--muted);
  opacity: 0.75;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-bar:hover .about-bar__note,
.page-about .about-bar:focus-within .about-bar__note {
  opacity: 1;
  color: var(--text);
}

/* ---------- 补充数据 ---------- */
.page-about .about-notes {
  display: grid;
  gap: 20px;
}

.page-about .about-notes__item {
  border-left: 2px solid var(--border);
  padding: 2px 0 2px 18px;
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-notes__item:hover {
  border-left-color: var(--accent);
}

.page-about .about-notes__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-32);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-notes__unit {
  margin-left: 8px;
  font-family: var(--font-body);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-notes__text {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-14);
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-section--last {
  margin-top: 80px;
}

.page-about .about-cta {
  border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%);
  padding: 30px 24px 32px;
}

.page-about .about-cta__cap {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-cta .h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-cta p {
  margin: 0 0 24px;
  max-width: 62ch;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
}

.page-about .about-textlink {
  font-size: var(--fs-14);
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-board {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-labs {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }
}

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 112px;
  }

  .page-about .about-hero {
    padding: 44px 0 72px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--masthead-space) + 24px);
  }

  .page-about .about-section + .about-section {
    margin-top: 88px;
  }

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

  .page-about .about-cta {
    padding: 40px 40px 44px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-bars {
    gap: 30px;
  }

  .page-about .about-bar {
    padding: 20px 24px 22px;
  }
}