.page-about {
  --ab-gap: clamp(48px, 7vw, 96px);
  --ab-pad: clamp(18px, 2.4vw, 28px);
  --ab-cut: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 28px 0 30px;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(53, 224, 208, .09), transparent 58%),
    linear-gradient(180deg, rgba(11, 37, 69, .65), rgba(5, 19, 31, 0) 72%);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about .ab-hero__lead {
  min-width: 0;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 8vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-hero__title::after {
  content: "";
  display: block;
  width: 84px;
  height: 3px;
  margin-top: 20px;
  background: var(--cyan);
  transform: skewX(-24deg);
  transform-origin: left center;
}

.page-about .ab-hero__sub {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .ab-status {
  padding: 20px var(--ab-pad) 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 rgba(53, 224, 208, .07);
  min-width: 0;
}

.page-about .ab-status__head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-status__head .lamp {
  flex: 0 0 auto;
}

.page-about .ab-status__list {
  margin: 0;
  display: grid;
}

.page-about .ab-status__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-status__row dt {
  font-size: 13px;
  color: var(--steel);
}

.page-about .ab-status__row dd {
  margin: 0;
  text-align: right;
  font-size: 13.5px;
  color: var(--white);
}

.page-about .ab-status__row dd.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .ab-status__link {
  display: block;
  width: 100%;
  margin-top: 16px;
  text-align: center;
}

/* ---------- 数字带 ---------- */
.page-about .ab-band {
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(11, 37, 69, .85), rgba(5, 19, 31, .2) 72%);
}

.page-about .ab-band__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 2px 0 6px;
  margin: 0;
  scrollbar-width: thin;
}

.page-about .ab-band__item {
  flex: 0 0 auto;
  min-width: 142px;
  padding: 12px 16px;
  background: rgba(22, 50, 79, .5);
  border-left: 2px solid var(--cyan);
}

.page-about .ab-band__value {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin-top: 7px;
}

.page-about .ab-band__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-band__unit {
  font-size: 12px;
  color: var(--steel);
}

/* ---------- 使命 ---------- */
.page-about .ab-mission {
  padding: var(--ab-gap) 0;
}

.page-about .ab-mission__grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-mission__note {
  display: none;
  color: var(--cyan);
}

.page-about .ab-mission__body {
  min-width: 0;
}

.page-about .ab-mission__body p {
  margin: 0 0 18px;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--white);
}

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

.page-about .ab-mission__points {
  list-style: none;
  margin: 28px 0 26px;
  padding: 0;
}

.page-about .ab-mission__points li {
  position: relative;
  padding: 14px 0 14px 24px;
  border-top: 1px solid var(--line-soft);
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--fog);
}

.page-about .ab-mission__points li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-mission__points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 21px;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.page-about .ab-mission__edge {
  padding-left: 14px;
  border-left: 2px solid var(--yellow);
  font-size: .875rem !important;
  line-height: 1.75;
  color: var(--steel) !important;
}

/* ---------- 数据口径 ---------- */
.page-about .ab-method {
  padding: var(--ab-gap) 0;
  background:
    repeating-linear-gradient(90deg, rgba(201, 216, 226, .045) 0 1px, transparent 1px 104px),
    linear-gradient(180deg, rgba(11, 37, 69, .5), rgba(5, 19, 31, 0) 62%);
}

.page-about .ab-method__fig {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .ab-spec {
  display: grid;
  gap: 14px;
}

.page-about .ab-spec__card {
  padding: var(--ab-pad);
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  clip-path: var(--ab-cut);
  min-width: 0;
}

.page-about .ab-spec__card .tag {
  margin: 0;
}

.page-about .ab-spec__name {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-spec__meta {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-spec__meta > div {
  display: grid;
  gap: 3px;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-spec__meta > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-spec__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--steel);
}

.page-about .ab-spec__meta dd {
  margin: 0;
  font-size: .875rem;
  line-height: 1.68;
  color: var(--fog);
}

.page-about .ab-term-line {
  margin: clamp(26px, 3.5vw, 38px) 0 0;
  max-width: 72ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .ab-term {
  position: relative;
  display: inline-block;
  color: var(--cyan);
  border-bottom: 1px dashed rgba(53, 224, 208, .55);
  cursor: help;
}

.page-about .ab-term:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .ab-term__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 9px);
  width: min(250px, 68vw);
  padding: 10px 12px;
  background: var(--layer);
  border: 1px solid var(--line);
  color: var(--fog);
  font-size: 13px;
  line-height: 1.62;
  letter-spacing: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  pointer-events: none;
  z-index: 6;
}

.page-about .ab-term:hover .ab-term__tip,
.page-about .ab-term:focus .ab-term__tip,
.page-about .ab-term:focus-visible .ab-term__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .ab-chain {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-chain__step {
  position: relative;
  padding: 16px 18px;
  background: rgba(22, 50, 79, .38);
  border-left: 2px solid var(--layer);
}

.page-about .ab-chain__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .ab-chain__h {
  margin: 8px 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-chain__step p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: var(--ab-gap) 0;
}

.page-about .ab-team__grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-team__cards {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-about .ab-team__card {
  padding: var(--ab-pad);
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
  min-width: 0;
}

.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--layer);
  outline: none;
}

.page-about .ab-team__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-team__count {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
}

.page-about .ab-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-team__unit {
  font-size: 12px;
  color: var(--steel);
}

.page-about .ab-team__role {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-team__duty {
  margin: 0 0 10px;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--fog);
  opacity: .74;
  transition: opacity .25s var(--ease);
}

.page-about .ab-team__card:hover .ab-team__duty,
.page-about .ab-team__card:focus-visible .ab-team__duty {
  opacity: 1;
}

.page-about .ab-team__own {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .ab-team__fig {
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  padding: var(--ab-gap) 0;
  background: linear-gradient(180deg, rgba(5, 19, 31, 0), rgba(11, 37, 69, .42) 40%, rgba(5, 19, 31, 0));
}

.page-about .ab-timeline__fig {
  margin: 0 0 clamp(30px, 4.5vw, 52px);
}

.page-about .ab-timeline__list {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline__list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(53, 224, 208, .7), rgba(53, 224, 208, .08));
}

.page-about .ab-tl__node {
  position: relative;
  padding: 0 0 0 42px;
  margin-bottom: 26px;
  min-width: 0;
}

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

.page-about .ab-tl__node .timeline__dot {
  position: absolute;
  left: 4px;
  top: 8px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .ab-tl__card {
  padding: 16px var(--ab-pad);
  background: rgba(11, 37, 69, .72);
  border: 1px solid var(--line);
  border-left: 2px solid var(--layer);
  min-width: 0;
}

.page-about .ab-tl__phase {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--yellow);
}

.page-about .ab-tl__title {
  margin: 9px 0 9px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-tl__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--fog);
}

.page-about .ab-tl__more {
  margin-top: 12px;
  border-top: 1px solid var(--line-soft);
  padding-top: 10px;
}

.page-about .ab-tl__more summary {
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cyan);
  cursor: pointer;
  list-style: none;
}

.page-about .ab-tl__more summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl__more summary::before {
  content: "+ ";
  font-family: var(--font-mono);
}

.page-about .ab-tl__more[open] summary::before {
  content: "– ";
}

.page-about .ab-tl__more summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-tl__more p {
  margin: 9px 0 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 更新与纠错 ---------- */
.page-about .ab-cadence {
  padding: var(--ab-gap) 0;
}

.page-about .ab-cadence__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-cadence__h {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

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

.page-about .ab-rows__item {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-rows__k {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--yellow);
}

.page-about .ab-rows__v {
  font-size: .9375rem;
  line-height: 1.68;
  color: var(--fog);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  counter-reset: abstep;
}

.page-about .ab-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-steps__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .ab-steps__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--fog);
}

.page-about .ab-cadence__link {
  display: inline-block;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-reach {
  padding: var(--ab-gap) 0;
  background: linear-gradient(180deg, rgba(11, 37, 69, .45), rgba(5, 19, 31, 0));
}

.page-about .ab-reach__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-reach__lead {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .ab-reach__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-reach__list li {
  padding: 13px 0;
  border-top: 1px solid var(--line-soft);
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--fog);
}

.page-about .ab-reach__list li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-reach__list strong {
  color: var(--cyan);
  font-weight: 700;
}

.page-about .ab-reach__addr {
  margin: 20px 0 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--steel);
}

.page-about .ab-reach__visual {
  padding: var(--ab-pad);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--ab-cut);
  min-width: 0;
}

.page-about .ab-reach__vlabel {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-reach__cells {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
}

.page-about .ab-reach__cell {
  display: block;
  height: 34px;
  transform: skewX(-8deg);
}

.page-about .ab-reach__cell--pro {
  background: linear-gradient(180deg, var(--cyan), rgba(53, 224, 208, .35));
}

.page-about .ab-reach__cell--region {
  background: linear-gradient(180deg, var(--layer), rgba(22, 50, 79, .5));
  border: 1px solid var(--line);
}

.page-about .ab-reach__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-reach__legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  color: var(--fog);
}

.page-about .ab-reach__swatch {
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  transform: skewX(-8deg);
}

.page-about .ab-reach__swatch--pro {
  background: var(--cyan);
}

.page-about .ab-reach__swatch--region {
  background: var(--layer);
  border: 1px solid var(--line);
}

.page-about .ab-reach__vnote {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--steel);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding: var(--ab-gap) 0 calc(var(--ab-gap) + 16px);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-next__item a {
  display: block;
  padding: 16px 18px;
  background: rgba(11, 37, 69, .6);
  border: 1px solid var(--line);
  text-decoration: none;
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .ab-next__item a:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--layer);
}

.page-about .ab-next__item a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-next__t {
  display: block;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-next__d {
  display: block;
  margin-top: 7px;
  font-size: .875rem;
  line-height: 1.68;
  color: var(--steel);
}

.page-about .ab-next__foot {
  margin: 22px 0 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--steel);
}

.page-about .ab-next__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px dashed rgba(53, 224, 208, .5);
}

.page-about .ab-next__foot a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .ab-team__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .ab-spec {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-chain {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }

  .page-about .ab-chain__step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -20px;
    top: 50%;
    width: 9px;
    height: 9px;
    border-top: 2px solid var(--cyan);
    border-right: 2px solid var(--cyan);
    transform: translateY(-50%) rotate(45deg);
    opacity: .75;
  }

  .page-about .ab-cadence__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: clamp(30px, 5vw, 64px);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 40px 0 36px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 72px);
    align-items: end;
    margin-top: 36px;
  }

  .page-about .ab-mission__grid {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .ab-mission__note {
    display: block;
    margin: 6px 0 0;
  }

  .page-about .ab-mission__body {
    max-width: 70ch;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-about .ab-team__fig {
    position: sticky;
    top: 24px;
  }

  .page-about .ab-reach__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(30px, 4.5vw, 64px);
    align-items: start;
  }

  /* 时间轴左右交替 */
  .page-about .ab-timeline__list::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .ab-tl__node {
    width: 50%;
    padding: 0 44px 0 0;
    margin-bottom: 30px;
  }

  .page-about .ab-tl__node:nth-child(odd) {
    margin-left: 0;
    text-align: right;
  }

  .page-about .ab-tl__node:nth-child(odd) .ab-tl__card {
    border-left: 1px solid var(--line);
    border-right: 2px solid var(--layer);
  }

  .page-about .ab-tl__node:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 0 44px;
    text-align: left;
  }

  .page-about .ab-tl__node .timeline__dot {
    left: auto;
    right: -8px;
    top: 22px;
  }

  .page-about .ab-tl__node:nth-child(even) .timeline__dot {
    right: auto;
    left: -8px;
  }

  .page-about .ab-tl__more {
    text-align: inherit;
  }
}

@media (min-width: 1120px) {
  .page-about .ab-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card,
  .page-about .ab-next__item a,
  .page-about .ab-term__tip,
  .page-about .ab-team__duty {
    transition: none;
  }
}