.page-about {
  --ab-gap: clamp(20px, 4vw, 56px);
  --ab-hair: 1px solid var(--c-line);
  padding-bottom: clamp(48px, 8vw, 110px);
  overflow-x: hidden;
}

.page-about .breadcrumb a {
  color: var(--c-grey);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--c-cyan);
}

/* ---------- HERO ---------- */
.page-about .ab-hero {
  padding-top: clamp(84px, 13vw, 148px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 32px);
  align-items: end;
  padding-bottom: var(--ab-gap);
  border-bottom: var(--ab-hair);
}

.page-about .ab-hero__lead .display-title {
  margin: 10px 0 18px;
  font-size: clamp(32px, 8vw, 76px);
  line-height: 1.06;
  letter-spacing: -.01em;
}

.page-about .ab-hero__lead .lede {
  max-width: 58ch;
}

.page-about .ab-hero__entry {
  margin-top: 18px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-cyan);
  text-transform: uppercase;
}

.page-about .ab-vert {
  display: inline-block;
  writing-mode: horizontal-tb;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--c-grey);
}

.page-about .ab-hero__media {
  margin-top: clamp(22px, 4vw, 40px);
}

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

.page-about .ab-hero__figure .figure__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  filter: saturate(112%) contrast(104%);
}

/* ---------- STRIP ---------- */
.page-about .ab-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--c-line);
  border: var(--ab-hair);
}

.page-about .ab-strip__item {
  background: var(--c-panel);
  padding: clamp(16px, 3vw, 26px) clamp(14px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-strip__k {
  font-size: clamp(28px, 6vw, 46px);
  line-height: 1;
  color: var(--c-white);
  letter-spacing: -.02em;
}

.page-about .ab-strip__k em {
  font-style: normal;
  font-size: .45em;
  color: var(--c-cyan);
  margin-left: 2px;
}

.page-about .ab-strip__l {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-grey);
}

/* ---------- 通用小节头 ---------- */
.page-about .ab-head {
  max-width: 66ch;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .ab-head .section-title {
  margin: 10px 0 14px;
}

/* ---------- SCOPE ---------- */
.page-about .ab-scope__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .ab-scope__item {
  padding: clamp(20px, 3vw, 30px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-scope__item .sub-title {
  margin: 0;
  font-size: clamp(19px, 2.6vw, 24px);
}

.page-about .ab-scope__item p {
  margin: 0;
  color: var(--c-grey);
  line-height: 1.7;
  font-size: 15px;
}

/* ---------- SCALE ---------- */
.page-about .ab-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-scale__text p {
  color: var(--c-grey);
  line-height: 1.75;
  margin: 0 0 14px;
}

.page-about .ab-scale__facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-scale__facts li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  color: var(--c-white);
  line-height: 1.6;
}

.page-about .ab-scale__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--c-cyan);
}

.page-about .ab-scale__facts .num {
  color: var(--c-orange);
  margin-right: 4px;
}

.page-about .ab-scale__figure {
  border: var(--ab-hair);
  background:
    linear-gradient(180deg, rgba(14, 22, 38, .9), rgba(7, 11, 20, .9)),
    repeating-linear-gradient(90deg, rgba(28, 42, 63, .5) 0 1px, transparent 1px 48px);
  padding: clamp(14px, 2.6vw, 26px);
}

.page-about .ab-bars {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.page-about .ab-bars__grid line {
  stroke: var(--c-line);
  stroke-width: 1;
}

.page-about .ab-bars__base {
  stroke: var(--c-line);
  stroke-width: 1.5;
}

.page-about .ab-bars__bars rect {
  fill: rgba(0, 229, 255, .28);
}

.page-about .ab-bars__bars rect.is-peak {
  fill: var(--c-orange);
}

.page-about .ab-bars__labels text {
  fill: var(--c-grey);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

.page-about .ab-bars__labels text:first-child {
  fill: var(--c-orange);
}

/* ---------- PATH ---------- */
.page-about .ab-path__list {
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 42px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-line);
  border: var(--ab-hair);
}

.page-about .ab-path__step {
  background: linear-gradient(120deg, rgba(14, 22, 38, 1), rgba(7, 11, 20, 1));
  padding: clamp(18px, 3vw, 28px);
  display: grid;
  gap: 8px;
}

.page-about .ab-path__no {
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--c-cyan);
}

.page-about .ab-path__step strong {
  font-size: clamp(22px, 4.4vw, 32px);
  color: var(--c-white);
  line-height: 1.1;
}

.page-about .ab-path__step span:last-child {
  font-size: 14px;
  color: var(--c-grey);
}

.page-about .ab-path__entries {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .ab-entry {
  border-left: 2px solid var(--c-cyan);
  padding: 4px 0 4px 18px;
}

.page-about .ab-entry .sub-title {
  margin: 10px 0 8px;
  font-size: clamp(18px, 2.4vw, 22px);
}

.page-about .ab-entry p {
  margin: 0;
  color: var(--c-grey);
  line-height: 1.7;
  font-size: 15px;
}

.page-about .ab-path__note {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: clamp(18px, 3vw, 28px);
  border: var(--ab-hair);
  border-left: 3px solid var(--c-orange);
  background: var(--c-panel);
  color: var(--c-white);
  line-height: 1.75;
  font-size: 15px;
  max-width: 78ch;
}

/* ---------- TEAM ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-team__text p {
  color: var(--c-grey);
  line-height: 1.75;
  margin: 0 0 14px;
}

.page-about .ab-team__text .section-title {
  margin: 10px 0 16px;
}

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

.page-about .ab-team__figure::after {
  content: "";
  position: absolute;
  inset: auto -10px -10px auto;
  width: 62%;
  height: 56%;
  border-right: 1px solid var(--c-cyan);
  border-bottom: 1px solid var(--c-cyan);
  pointer-events: none;
}

.page-about .ab-team__photo .figure__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

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

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-purple) 62%, rgba(139, 92, 246, 0) 100%);
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 16px 0 20px;
  border-bottom: var(--ab-hair);
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 24px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  transition: border-color .35s var(--ease), box-shadow .35s var(--ease);
}

.page-about .ab-timeline__item.is-visible::before {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, .1);
}

.page-about .ab-timeline__item--now::before {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 5px rgba(255, 106, 0, .14);
}

.page-about .ab-timeline__no {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-cyan);
}

.page-about .ab-timeline__item--now .ab-timeline__no {
  color: var(--c-orange);
}

.page-about .ab-timeline__item .sub-title {
  margin: 8px 0 6px;
  font-size: clamp(17px, 2.3vw, 21px);
}

.page-about .ab-timeline__item p {
  margin: 0;
  color: var(--c-grey);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .ab-history__side {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .ab-history__figure .figure__media img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .ab-honors {
  border: var(--ab-hair);
  background: var(--c-panel);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .ab-honors__title {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-grey);
  font-family: var(--font-mono);
}

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

.page-about .ab-honors__list li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  color: var(--c-white);
  line-height: 1.55;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(28, 42, 63, .9);
}

.page-about .ab-honors__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

/* ---------- NEXT ---------- */
.page-about .ab-next__panel {
  border: var(--ab-hair);
  background:
    radial-gradient(120% 130% at 12% 0%, rgba(0, 229, 255, .09), rgba(7, 11, 20, 0) 58%),
    var(--c-panel);
  padding: clamp(22px, 4vw, 46px);
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .ab-next__lead p {
  color: var(--c-grey);
  line-height: 1.75;
  margin: 0;
}

.page-about .ab-next__lead .section-title {
  margin: 10px 0 14px;
}

.page-about .ab-next__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--c-line);
  border: var(--ab-hair);
}

.page-about .ab-next__link {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.6vw, 22px);
  background: rgba(7, 11, 20, .82);
  text-decoration: none;
  transition: background .25s var(--ease), padding-left .25s var(--ease);
}

.page-about .ab-next__link-k {
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: .02em;
}

.page-about .ab-next__link-d {
  font-size: 13px;
  color: var(--c-grey);
  line-height: 1.6;
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  background: rgba(0, 229, 255, .08);
  padding-left: clamp(22px, 3.2vw, 30px);
}

.page-about .ab-next__link:hover .ab-next__link-k,
.page-about .ab-next__link:focus-visible .ab-next__link-k {
  color: var(--c-cyan);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 720px) {
  .page-about .ab-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-scope__item:nth-child(2) {
    transform: translateY(26px);
  }

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

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

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

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) 130px;
  }

  .page-about .ab-vert {
    writing-mode: vertical-rl;
    letter-spacing: .32em;
  }

  .page-about .ab-scale__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(40px, 6vw, 84px);
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(40px, 6vw, 84px);
  }

  .page-about .ab-history__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(40px, 6vw, 84px);
  }

  .page-about .ab-next__panel {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .ab-path__step:nth-child(2) {
    background: linear-gradient(120deg, rgba(14, 22, 38, .92), rgba(7, 11, 20, 1));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-timeline__item::before,
  .page-about .ab-scope__item,
  .page-about .ab-next__link {
    transition: none;
    transform: none;
  }
}