.page-about {
  --ab-rail: 104px;
  --ab-soft: #A9BCCB;
  --ab-line: rgba(79, 163, 181, 0.30);
  --ab-line-strong: rgba(79, 163, 181, 0.52);
  --ab-band-pad: 52px;
  background: var(--c-night);
  color: var(--c-paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .ab-crumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--pad) 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ab-soft);
}

.page-about .ab-crumb a {
  color: var(--c-azurite-soft);
  text-decoration: none;
}

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

.page-about .ab-crumb-sep {
  color: var(--ab-line-strong);
}

.page-about .ab-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
  display: block;
}

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

/* 左侧纵向时间刻度 */
.page-about .ab-rail {
  display: none;
}

.page-about .ab-rail-title {
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .ab-tick {
  position: relative;
  padding-left: 26px;
  padding-bottom: 30px;
}

.page-about .ab-tick::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 0;
  width: 1px;
  background: var(--ab-line);
}

.page-about .ab-tick:last-child::before {
  background: linear-gradient(180deg, var(--ab-line), transparent);
}

.page-about .ab-tick::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--c-amber);
  background: var(--c-night);
  transform: rotate(45deg);
}

.page-about .ab-tick span {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-paper);
  letter-spacing: 0.02em;
}

.page-about .ab-tick em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-size: 11px;
  line-height: 1.4;
  color: var(--ab-soft);
}

/* 区块底 */
.page-about .ab-band {
  position: relative;
  padding: var(--ab-band-pad) 0;
}

.page-about .ab-band--night {
  background: var(--c-night);
  color: var(--c-paper);
}

.page-about .ab-band--deep {
  background: var(--c-deep);
  color: var(--c-paper);
}

.page-about .ab-band--paper {
  background: var(--c-paper);
  color: var(--c-ink);
  --ab-soft: #5C6670;
  --ab-line: rgba(20, 24, 29, 0.14);
  --ab-line-strong: rgba(31, 122, 140, 0.42);
}

.page-about .ab-band--dune {
  background: var(--c-dune);
  color: var(--c-ink);
  --ab-soft: #5C6670;
  --ab-line: rgba(20, 24, 29, 0.16);
  --ab-line-strong: rgba(31, 122, 140, 0.46);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-amber);
}

.page-about .ab-band--paper .eyebrow,
.page-about .ab-band--dune .eyebrow {
  color: var(--c-azurite);
}

.page-about .ab-head {
  max-width: 42em;
}

.page-about .ab-head .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-sub {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ab-soft);
}

/* 首屏 */
.page-about .ab-hero {
  padding-top: 30px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: -30px;
  right: -30px;
  top: -20px;
  height: 300px;
  background: linear-gradient(118deg, rgba(31, 122, 140, 0.30), rgba(10, 26, 47, 0) 64%);
  transform: skewY(-4deg);
  transform-origin: top left;
  pointer-events: none;
}

.page-about .ab-hero-copy {
  position: relative;
  z-index: 1;
}

.page-about .ab-h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 7.4vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .ab-lede {
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-paper);
  max-width: 34em;
}

.page-about .ab-coords {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-coords li {
  background: var(--c-night);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-coord-k {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ab-soft);
}

.page-about .ab-coord-v {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 19px;
  color: var(--c-amber);
  letter-spacing: 0.02em;
}

.page-about .ab-hero-fig {
  margin: 32px 0 0;
}

.page-about .ab-hero-fig img,
.page-about .ab-reach-fig img {
  display: block;
  width: 100%;
  height: auto;
}

/* 团队仪表板 */
.page-about .ab-tabs {
  margin-top: 8px;
}

.page-about .ab-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.page-about .ab-tab {
  font: inherit;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--c-ink);
  background: var(--c-dune);
  border: 1px solid rgba(20, 24, 29, 0.16);
  padding: 11px 18px;
  cursor: pointer;
  transform: skewX(-6deg);
  transition: background 0.24s var(--ease), color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .ab-tab > span {
  display: inline-block;
  transform: skewX(6deg);
}

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

.page-about .ab-tab[aria-selected="true"] {
  background: var(--c-azurite);
  border-color: var(--c-azurite);
  color: var(--c-paper);
}

.page-about .ab-tab:focus-visible {
  outline: 2px solid var(--c-azurite-soft);
  outline-offset: 3px;
}

.page-about .ab-panel {
  margin-top: 22px;
  padding: 24px 22px;
  background: var(--c-dune);
  border: 1px solid rgba(20, 24, 29, 0.10);
  border-left: 4px solid var(--c-azurite);
  box-shadow: var(--shadow);
}

.page-about .ab-panel[hidden],
.page-about .ab-panel[aria-hidden="true"] {
  display: none;
}

.page-about .ab-panel h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.page-about .ab-panel ul {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-panel li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.75;
  color: #2A3038;
}

.page-about .ab-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--c-amber);
  transform: rotate(45deg);
}

.page-about .ab-panel--build {
  border-left-color: var(--c-amber);
}

.page-about .ab-panel--video {
  border-left-color: var(--c-cinnabar);
}

.page-about .ab-panel--care {
  border-left-color: var(--c-danxia);
}

/* 生产节奏窄栏 */
.page-about .ab-flow-band {
  padding-top: 46px;
  padding-bottom: 46px;
}

.page-about .ab-narrow {
  max-width: 34em;
}

.page-about .ab-narrow .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 5vw, 32px);
  line-height: 1.24;
  letter-spacing: -0.02em;
}

.page-about .ab-narrow p {
  margin: 18px 0 0;
  font-size: 16.5px;
  line-height: 1.8;
}

.page-about .ab-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--ab-line);
}

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

.page-about .ab-steps .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-cinnabar);
  letter-spacing: 0.02em;
  padding-top: 4px;
}

.page-about .ab-steps strong {
  font-family: var(--font-head);
  font-weight: 800;
}

.page-about .ab-tail {
  font-size: 15.5px;
  color: #3C444D;
}

.page-about .ab-tail a {
  color: var(--c-azurite);
  text-decoration: none;
  border-bottom: 1px solid var(--c-azurite-soft);
}

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

/* 覆盖范围 */
.page-about .ab-reach-grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-reach .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-reach-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-reach-list li {
  background: var(--c-deep);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-reach-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--c-amber);
  letter-spacing: 0.02em;
}

.page-about .ab-reach-num em {
  font-style: normal;
  font-size: 18px;
  color: var(--c-cinnabar);
}

.page-about .ab-reach-k {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ab-soft);
}

.page-about .ab-reach-fig {
  margin: 0;
}

/* 里程碑 */
.page-about .ab-miles {
  overflow: hidden;
}

.page-about .ab-miles-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  z-index: 0;
}

.page-about .ab-miles-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-miles .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-milelist {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-mile {
  border: 1px solid var(--ab-line-strong);
  background: rgba(18, 58, 74, 0.78);
  box-shadow: var(--shadow);
}

.page-about .ab-mile summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 18px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--c-paper);
}

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

.page-about .ab-mile summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--c-amber);
}

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

.page-about .ab-mile summary .mono {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-amber);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-about .ab-mile-body {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.75;
  color: #C6D6E1;
  border-top: 1px solid var(--ab-line);
  padding-top: 14px;
}

.page-about .ab-holdcard {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  border: 1px dashed var(--c-amber);
  background: rgba(224, 163, 62, 0.10);
  cursor: pointer;
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .ab-holdcard:focus-visible {
  outline: 2px solid var(--c-azurite-soft);
  outline-offset: 3px;
}

.page-about .ab-holdcard.is-holding {
  transform: scale(0.985);
  background: rgba(200, 56, 43, 0.18);
}

.page-about .ab-holdcard.is-held {
  border-style: solid;
  border-color: var(--c-amber);
}

.page-about .ab-holdcard-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-amber);
}

.page-about .ab-holdcard-text {
  font-size: 15.5px;
  line-height: 1.7;
  color: #D6E2EA;
}

/* 基地一天 */
.page-about .ab-day .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-hours {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(24, minmax(0, 1fr));
  gap: 2px;
}

.page-about .ab-hours li {
  position: relative;
  height: 66px;
  background: var(--c-deep);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ab-soft);
  overflow: hidden;
}

.page-about .ab-hours li:nth-child(n+7):nth-child(-n+9) {
  background: var(--c-azurite);
  color: var(--c-paper);
}

.page-about .ab-hours li:nth-child(n+10):nth-child(-n+21) {
  background: linear-gradient(180deg, var(--c-amber), var(--c-danxia));
  color: var(--c-night);
}

.page-about .ab-hours li:nth-child(n+1):nth-child(-n+6),
.page-about .ab-hours li:nth-child(n+22):nth-child(-n+24) {
  background: var(--c-night);
  border-top: 2px solid var(--c-azurite);
}

.page-about .ab-day-legend {
  margin-top: 26px;
  display: grid;
  gap: 16px;
}

.page-about .ab-day-legend > div {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .ab-day-legend p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: #2A3038;
}

.page-about .ab-slot {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-cinnabar);
  letter-spacing: 0.02em;
  margin-right: 8px;
}

.page-about .ab-dot {
  width: 12px;
  height: 12px;
  margin-top: 7px;
  transform: rotate(45deg);
  display: block;
}

.page-about .ab-dot--dawn {
  background: var(--c-azurite);
}

.page-about .ab-dot--day {
  background: var(--c-amber);
}

.page-about .ab-dot--night {
  background: var(--c-night);
  border: 1px solid var(--c-azurite);
}

/* 结尾入口 */
.page-about .ab-cta .section-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 5.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-cta-grid {
  margin-top: 30px;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-cta-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--c-night);
  color: var(--c-paper);
  text-decoration: none;
  transition: background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .ab-cta-card:hover {
  background: var(--c-deep);
  transform: translateY(-2px);
}

.page-about .ab-cta-card:focus-visible {
  outline: 2px solid var(--c-azurite-soft);
  outline-offset: -2px;
}

.page-about .ab-cta-k {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-amber);
  letter-spacing: 0.1em;
}

.page-about .ab-cta-card strong {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
}

.page-about .ab-cta-d {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ab-soft);
}

/* 桌面布局 */
@media (min-width: 768px) {
  .page-about {
    --ab-band-pad: 64px;
  }

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

  .page-about .ab-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: end;
  }

  .page-about .ab-hero-fig {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-reach-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .ab-milelist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .page-about .ab-milelist > li:nth-child(even) {
    transform: translateY(26px);
  }
}

@media (min-width: 1024px) {
  .page-about .ab-shell {
    display: grid;
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: 38px;
    align-items: start;
  }

  .page-about .ab-rail {
    display: block;
  }

  .page-about .ab-rail-inner {
    position: sticky;
    top: 132px;
    padding-top: 42px;
  }

  .page-about .ab-flow {
    max-width: none;
  }
}

@media (max-width: 720px) {
  .page-about .ab-hours li {
    height: 42px;
    font-size: 0;
    padding-bottom: 0;
  }

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

  .page-about .ab-reach-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tab,
  .page-about .ab-cta-card,
  .page-about .ab-holdcard {
    transition: none;
  }

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

  .page-about .ab-holdcard.is-holding {
    transform: none;
  }
}