.page-about {
  --ab-gap: clamp(56px, 8vw, 112px);
  --ab-radius: 2px 18px 2px 18px;
  background: var(--c-ink);
  color: var(--c-mist);
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--f-head);
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .ab-crumb {
  padding: clamp(14px, 2.6vw, 26px) 0 0;
}

.page-about .ab-crumb .tk-breadcrumb {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-silver);
}

.page-about .ab-crumb .tk-breadcrumb a {
  color: var(--c-silver);
  text-decoration: none;
}

.page-about .ab-crumb .tk-breadcrumb a:hover {
  color: var(--c-lime);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(24px, 4vw, 48px) 0 var(--ab-gap);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(36px, 6vw, 68px);
  align-items: start;
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(29px, 6.2vw, 56px);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--c-mist);
}

.page-about .ab-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 34em;
  color: var(--c-silver);
  line-height: 1.8;
}

.page-about .tk-lead {
  line-height: 1.8;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  background: var(--c-rule-soft);
  border-top: 1px solid var(--c-rule);
  border-bottom: 1px solid var(--c-rule);
}

.page-about .ab-hero__stat {
  padding: 14px 12px 14px 0;
  background: var(--c-ink);
}

.page-about .ab-hero__stat dt {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-silver);
  margin-bottom: 6px;
}

.page-about .ab-hero__stat dd {
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(22px, 3.4vw, 30px);
  letter-spacing: -.01em;
  color: var(--c-mist);
}

.page-about .ab-hero__visual {
  position: relative;
  padding-top: 6px;
}

.page-about .ab-sheet {
  border: 1px solid var(--c-rule);
  box-shadow: var(--sh-deep);
}

.page-about .ab-sheet--back {
  position: absolute;
  top: 0;
  left: 6%;
  right: 4%;
  height: 62%;
  border-radius: var(--r-card);
  background:
    repeating-linear-gradient(135deg, rgba(200,255,77,.06) 0 2px, transparent 2px 9px),
    linear-gradient(155deg, var(--c-navy), var(--c-ink));
  transform: rotate(-2.4deg);
}

.page-about .ab-sheet__stamp {
  position: absolute;
  right: 14px;
  bottom: 14px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--c-rule);
  writing-mode: vertical-rl;
}

.page-about .ab-sheet--front {
  position: relative;
  z-index: 2;
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--r-card);
  background: var(--c-panel);
  transform: rotate(-.6deg);
}

.page-about .ab-sheet__head {
  margin: 0 0 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-silver);
}

.page-about .ab-sheet__big {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
  font-family: var(--f-display);
  font-size: clamp(50px, 11vw, 78px);
  line-height: .86;
  letter-spacing: -.02em;
  color: var(--c-lime);
}

.page-about .ab-sheet__big span {
  font-family: var(--f-head);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--c-silver);
}

.page-about .ab-sheet__sub {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-silver);
}

.page-about .ab-sheet__bars {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-sheet__row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
}

.page-about .ab-sheet__row span {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-silver);
}

.page-about .ab-sheet__row i {
  display: block;
  height: 6px;
  background: linear-gradient(90deg, var(--c-lime), rgba(200,255,77,.18));
  border-radius: 999px;
}

.page-about .ab-sheet__row--1 i { width: 96%; }
.page-about .ab-sheet__row--2 i { width: 74%; }
.page-about .ab-sheet__row--3 i { width: 58%; background: linear-gradient(90deg, var(--c-orange), rgba(255,123,61,.18)); }

.page-about .ab-sheet__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--c-rule);
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  color: var(--c-rule);
  color: var(--c-silver);
}

.page-about .ab-hero__figure {
  position: relative;
  z-index: 1;
  margin: clamp(18px, 3vw, 26px) 0 0;
  border: 1px solid var(--c-rule);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--c-navy);
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 目录 ---------- */
.page-about .ab-toc {
  position: sticky;
  top: 68px;
  z-index: 6;
  padding: 9px 0;
  background: rgba(7,22,18,.9);
  border-top: 1px solid var(--c-rule-soft);
  border-bottom: 1px solid var(--c-rule-soft);
  backdrop-filter: blur(10px);
}

.page-about .ab-toc__inner {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .ab-toc .tk-anchor__link {
  flex: 0 0 auto;
  padding: 7px 14px;
  border: 1px solid var(--c-rule);
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--c-silver);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-toc .tk-anchor__link:hover,
.page-about .ab-toc .tk-anchor__link:focus-visible {
  color: var(--c-lime);
  border-color: var(--c-lime);
  outline: none;
}

.page-about .ab-toc .tk-anchor__link.is-current {
  color: var(--c-ink);
  background: var(--c-lime);
  border-color: var(--c-lime);
}

/* ---------- 历程轴 ---------- */
.page-about .ab-timeline {
  padding: var(--ab-gap) 0;
  background: var(--c-ink);
}

.page-about .ab-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 64px);
}

.page-about .ab-timeline__intro h2 {
  margin: 12px 0 0;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.24;
  color: var(--c-mist);
}

.page-about .ab-timeline__intro .tk-lead {
  margin: 16px 0 0;
  max-width: 32em;
  color: var(--c-silver);
}

.page-about .ab-timeline__hint {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-orange);
  font-family: var(--f-mono);
  font-size: 11.5px;
  line-height: 1.8;
  letter-spacing: .06em;
  color: var(--c-silver);
}

.page-about .ab-axis {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px clamp(20px, 3.4vw, 34px);
  border-left: 1px solid var(--c-rule);
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .ab-axis__item {
  position: relative;
}

.page-about .ab-axis__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(20px, 3.4vw, 34px) - 6px);
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 2px solid var(--c-lime);
  box-shadow: 0 0 0 4px rgba(200,255,77,.1);
}

.page-about .ab-axis__node {
  padding: clamp(15px, 2.4vw, 22px);
  border: 1px solid var(--c-rule);
  border-radius: var(--r-card);
  background: var(--c-panel);
  outline: none;
  transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}

.page-about .ab-axis__node:hover,
.page-about .ab-axis__node:focus-visible {
  border-color: var(--c-lime);
  transform: translateX(3px);
}

.page-about .ab-axis__year {
  margin: 0 0 4px;
  font-family: var(--f-display);
  font-size: 26px;
  letter-spacing: .04em;
  color: var(--c-lime);
}

.page-about .ab-axis__name {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.35;
  color: var(--c-mist);
}

.page-about .ab-axis__desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-silver);
}

.page-about .ab-axis__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-orange);
  transition: max-height .3s var(--ease), opacity .3s var(--ease), margin .3s var(--ease);
}

.page-about .ab-axis__node:hover .ab-axis__more,
.page-about .ab-axis__node:focus-within .ab-axis__more {
  max-height: 180px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: var(--ab-gap) 0;
  background: linear-gradient(180deg, var(--c-ink) 0%, var(--c-navy) 100%);
  border-top: 1px solid var(--c-rule-soft);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-team__copy h2 {
  margin: 12px 0 0;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.24;
  color: var(--c-mist);
}

.page-about .ab-team__copy .tk-lead {
  margin: 16px 0 0;
  max-width: 32em;
  color: var(--c-silver);
}

.page-about .ab-roles {
  list-style: none;
  margin: clamp(24px, 3.5vw, 34px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--c-rule);
  border-radius: var(--r-soft);
  overflow: hidden;
}

.page-about .ab-roles li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 16px 18px;
  background: var(--c-panel);
}

.page-about .ab-roles__num {
  flex: 0 0 auto;
  min-width: 42px;
  font-family: var(--f-display);
  font-size: 34px;
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--c-lime);
}

.page-about .ab-roles__body h3 {
  margin: 0;
  font-size: 16px;
  color: var(--c-mist);
}

.page-about .ab-roles__body p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .ab-shift {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-rule-soft);
  border-top: 1px solid var(--c-rule);
}

.page-about .ab-shift li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-silver);
  background: transparent;
}

.page-about .ab-shift .tk-data {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--c-orange);
}

.page-about .ab-team__figure {
  margin: 0;
  border: 1px solid var(--c-rule);
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--c-panel);
  transform: translateY(clamp(0px, 2.4vw, 28px));
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .ab-team__figure figcaption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--c-rule);
  font-family: var(--f-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--c-silver);
}

/* ---------- 排名规则（纸白） ---------- */
.page-about .ab-method {
  padding: var(--ab-gap) 0;
  background: var(--c-paper);
  color: var(--c-inktext);
  border-top: 1px solid var(--c-rule);
  border-bottom: 1px solid var(--c-rule);
}

.page-about .ab-method h2 {
  margin: 12px 0 0;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.24;
  color: var(--c-inktext);
}

.page-about .ab-method .tk-label {
  color: #4c635c;
}

.page-about .ab-method .tk-lead {
  margin: 16px 0 0;
  max-width: 36em;
  color: #3a4f49;
}

.page-about .ab-metrics {
  list-style: none;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(16,32,28,.16);
  border-radius: var(--r-soft);
  overflow: hidden;
}

.page-about .ab-metrics li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 14px;
  background: var(--c-paper);
  font-family: var(--f-head);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--c-inktext);
}

.page-about .ab-metrics__no {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--c-rule);
}

.page-about .ab-method__foot {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 36px);
  background: rgba(16,32,28,.16);
  border-radius: var(--r-soft);
  overflow: hidden;
}

.page-about .ab-method__note {
  padding: clamp(18px, 2.8vw, 26px);
  background: var(--c-paper);
}

.page-about .ab-method__num {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-size: clamp(20px, 3vw, 26px);
  letter-spacing: .01em;
  color: #1d4038;
}

.page-about .ab-method__note p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #34463f;
}

.page-about .ab-method__tail {
  margin: clamp(22px, 3vw, 30px) 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #34463f;
}

.page-about .ab-method__tail a {
  color: #1d4038;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--c-orange);
  padding-bottom: 1px;
}

.page-about .ab-method__tail a:hover {
  color: #0f2b24;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  padding: var(--ab-gap) 0;
  background: var(--c-navy);
}

.page-about .ab-partners__banner {
  margin: 0 0 clamp(30px, 4.6vw, 54px);
  border-top: 1px solid var(--c-rule);
  border-bottom: 1px solid var(--c-rule);
  overflow: hidden;
}

.page-about .ab-partners__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .ab-partners__head h2 {
  margin: 12px 0 0;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.24;
  color: var(--c-mist);
}

.page-about .ab-partners__head .tk-lead {
  margin: 16px 0 0;
  max-width: 36em;
  color: var(--c-silver);
}

.page-about .ab-wall {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 38px);
}

.page-about .ab-wall__item {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--c-rule);
  border-radius: var(--r-card);
  background: var(--c-panel);
  transition: border-color .25s var(--ease);
}

.page-about .ab-wall__item:hover {
  border-color: var(--c-lime);
}

.page-about .ab-wall__num {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-lime);
}

.page-about .ab-wall__item h3 {
  margin: 0;
  font-size: 17px;
  color: var(--c-mist);
}

.page-about .ab-wall__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-silver);
}

.page-about .ab-wall__meta {
  padding-top: 10px;
  border-top: 1px dashed var(--c-rule);
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--c-orange);
}

.page-about .ab-partners__entry {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: clamp(24px, 3.6vw, 36px);
  padding: clamp(18px, 2.6vw, 24px);
  border: 1px solid var(--c-rule);
  border-left: 3px solid var(--c-lime);
  border-radius: 2px 14px 2px 14px;
  background: rgba(16,42,36,.7);
}

.page-about .ab-partners__entry p {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-silver);
}

/* ---------- 收束 ---------- */
.page-about .ab-next {
  padding: var(--ab-gap) 0 0;
  background:
    radial-gradient(120% 80% at 84% 0%, rgba(200,255,77,.09), transparent 62%),
    var(--c-ink);
  border-top: 1px solid var(--c-rule);
}

.page-about .ab-next h2 {
  margin: 0;
  font-size: clamp(25px, 4.4vw, 40px);
  line-height: 1.24;
  color: var(--c-mist);
}

.page-about .ab-next__lead {
  margin: 14px 0 0;
  max-width: 32em;
  color: var(--c-silver);
}

.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .ab-next__card {
  display: block;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--c-rule);
  border-radius: var(--r-card);
  background: var(--c-panel);
  color: inherit;
  text-decoration: none;
  transition: border-color .25s var(--ease), transform .25s var(--ease), background .25s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: var(--c-lime);
  background: var(--c-navy);
  transform: translateY(-3px);
  outline: none;
}

.page-about .ab-next__tag {
  margin: 0 0 8px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-orange);
}

.page-about .ab-next__card h3 {
  margin: 0;
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--c-mist);
}

.page-about .ab-next__card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-silver);
}

.page-about .ab-next__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-lime);
}

.page-about .ab-next__card:hover .ab-next__go {
  color: var(--c-mist);
}

.page-about .ab-next__contact {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--c-rule);
}

.page-about .ab-next__contact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .ab-next__contact-line .tk-data {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-silver);
  min-width: 62px;
}

.page-about .ab-next__note {
  margin: 14px 0 0;
  max-width: 44em;
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-silver);
}

.page-about .ab-next__note a {
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--c-rule);
}

.page-about .ab-next__note a:hover {
  border-bottom-color: var(--c-lime);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-shift li {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 6fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .ab-hero__figure img {
    aspect-ratio: 5 / 4;
  }
}

@media (min-width: 980px) {
  .page-about .ab-toc {
    top: 76px;
  }

  .page-about .ab-timeline__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .ab-timeline__intro {
    position: sticky;
    top: 140px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ab-wall {
    grid-template-columns: 1.35fr .88fr 1fr;
    align-items: start;
  }

  .page-about .ab-wall__item--wide {
    margin-top: -18px;
  }

  .page-about .ab-wall__item--last {
    margin-top: 26px;
  }
}

@media (hover: none) {
  .page-about .ab-axis__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }

  .page-about .ab-timeline__hint {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-axis__node,
  .page-about .ab-next__card,
  .page-about .ab-wall__item,
  .page-about .ab-axis__more {
    transition: none;
  }

  .page-about .ab-axis__node:hover,
  .page-about .ab-axis__node:focus-visible {
    transform: none;
  }

  .page-about .ab-next__card:hover {
    transform: none;
  }
}