.page-about {
  --ab-warm: #A29286;
  --ab-warm-soft: rgba(162, 146, 134, 0.22);
  --ab-grid: rgba(233, 237, 242, 0.045);
  background: var(--ink-900);
  color: var(--ivory);
  overflow-x: clip;
}

.page-about .zk-container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: clamp(20px, 5vw, 40px);
}

.page-about .zk-breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ash);
}

.page-about .zk-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .zk-breadcrumb__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .zk-breadcrumb a {
  color: var(--ash);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .zk-breadcrumb a:hover,
.page-about .zk-breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .zk-breadcrumb__sep {
  color: rgba(233, 237, 242, 0.24);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 6vw, 48px) 0 clamp(42px, 8vw, 78px);
  isolation: isolate;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -18%;
  width: min(760px, 108vw);
  height: min(760px, 108vw);
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 32%, rgba(49, 230, 214, 0.14), transparent 62%),
    radial-gradient(circle at 72% 62%, rgba(255, 106, 42, 0.11), transparent 60%);
  pointer-events: none;
  z-index: -2;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, var(--ab-grid) 1px, transparent 1px);
  background-size: 84px 100%;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 72%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 72%);
  pointer-events: none;
  z-index: -1;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  align-items: end;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(32px, 8vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.035em;
  font-weight: 700;
  max-width: 16ch;
}

.page-about .ab-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.8;
  color: rgba(233, 237, 242, 0.78);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: clamp(22px, 4vw, 30px) 0 0;
  padding: clamp(16px, 3vw, 22px) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .ab-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--ivory);
}

.page-about .ab-hero__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ash);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 4vw, 30px);
}

.page-about .ab-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .ab-hero__figure::before {
  content: "";
  position: absolute;
  inset: 12px -10px -12px 12px;
  border-radius: var(--r-xl);
  border: 1px solid var(--ab-warm-soft);
  pointer-events: none;
}

.page-about .zk-figure__frame {
  overflow: hidden;
  border-radius: var(--r-lg);
  background: var(--ink-800);
  border: 1px solid var(--line);
}

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

.page-about .zk-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ash);
  line-height: 1.6;
}

/* 区块公共头部 */
.page-about .ab-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 4.5vw, 40px);
  max-width: 68ch;
}

.page-about .ab-head .zk-title--md {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.03em;
  max-width: 24ch;
}

.page-about .ab-head__note {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ash);
  max-width: 62ch;
}

/* 时间轴 */
.page-about .ab-track {
  position: relative;
}

.page-about .ab-track__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(22px, 4vw, 34px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-track__jump a {
  padding: 6px 13px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: rgba(11, 34, 51, 0.6);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ash);
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.page-about .ab-track__jump a:hover,
.page-about .ab-track__jump a:focus-visible {
  color: var(--cyan);
  border-color: rgba(49, 230, 214, 0.5);
  background: rgba(14, 74, 82, 0.4);
}

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

.page-about .ab-track__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-bottom: clamp(24px, 4vw, 34px);
  scroll-margin-top: 96px;
}

.page-about .ab-track__year {
  position: relative;
  margin: 0;
  padding-left: 22px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ab-warm);
}

.page-about .ab-track__year::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px rgba(49, 230, 214, 0.09);
}

.page-about .ab-track__body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ivory);
}

.page-about .ab-track__body > p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(233, 237, 242, 0.74);
}

.page-about .ab-track__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .zk-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ash);
}

.page-about .ab-track__more {
  margin-top: 14px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .ab-track__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  cursor: pointer;
  list-style: none;
  transition: color 0.16s ease;
}

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

.page-about .ab-track__more summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  text-align: center;
}

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

.page-about .ab-track__more summary:hover {
  color: var(--ivory);
}

.page-about .ab-track__more p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ash);
}

/* 目录架构 */
.page-about .ab-catalog__inner {
  padding: clamp(22px, 4.5vw, 48px);
  border-radius: var(--r-xl);
  border: 1px solid var(--line);
  background:
    linear-gradient(152deg, rgba(11, 34, 51, 0.95), rgba(7, 24, 36, 0.95)),
    radial-gradient(circle at 88% 8%, rgba(49, 230, 214, 0.08), transparent 55%);
}

.page-about .ab-catalog__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 42px);
  align-items: start;
}

.page-about .ab-catalog__text .zk-title--md {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.03em;
  max-width: 22ch;
}

.page-about .ab-catalog__copy {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(233, 237, 242, 0.76);
}

.page-about .ab-clusters {
  display: grid;
  gap: 11px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-clusters li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(233, 237, 242, 0.82);
}

.page-about .ab-clusters li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

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

.page-about .ab-layers {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 36px);
  padding-top: clamp(18px, 3vw, 24px);
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-layers__row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
}

.page-about .ab-layers__name {
  font-size: 12.5px;
  color: var(--ash);
}

.page-about .ab-layers__track {
  display: block;
  height: 6px;
  border-radius: var(--r-pill);
  background: rgba(233, 237, 242, 0.07);
  overflow: hidden;
}

.page-about .ab-layers__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
}

.page-about .ab-layers__fill--l1 {
  width: 100%;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
}

.page-about .ab-layers__fill--l2 {
  width: 74%;
  background: linear-gradient(90deg, rgba(14, 74, 82, 0.9), rgba(49, 230, 214, 0.55));
}

.page-about .ab-layers__fill--l3 {
  width: 48%;
  background: linear-gradient(90deg, rgba(162, 146, 134, 0.6), rgba(242, 184, 75, 0.6));
}

.page-about .ab-layers__val {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ivory);
}

/* 团队 */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

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

.page-about .ab-roles__item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ab-roles__count {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .ab-roles__body h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ivory);
}

.page-about .ab-roles__body p {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--ash);
}

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

.page-about .ab-cadence {
  margin-top: clamp(30px, 5vw, 48px);
}

.page-about .ab-cadence__label {
  margin: 0 0 4px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ash);
}

.page-about .ab-cadence__line {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 8px;
  padding-top: 20px;
  border-top: 2px solid var(--line-strong);
}

.page-about .ab-cadence__point {
  position: relative;
  padding-left: 16px;
}

.page-about .ab-cadence__point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 1px;
  height: 36px;
  background: var(--cyan);
  opacity: 0.55;
}

.page-about .ab-cadence__val {
  display: block;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--ivory);
}

.page-about .ab-cadence__desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash);
}

/* 服务覆盖 */
.page-about .ab-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-meter {
  display: grid;
  gap: 0;
}

.page-about .ab-meter__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 8px 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.16s ease;
}

.page-about .ab-meter__item:first-child {
  padding-top: 0;
}

.page-about .ab-meter__name {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(233, 237, 242, 0.8);
  transition: color 0.16s ease;
}

.page-about .ab-meter__val {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.page-about .ab-meter__track {
  grid-column: 1 / -1;
  display: block;
  height: 3px;
  border-radius: var(--r-pill);
  background: rgba(233, 237, 242, 0.08);
  overflow: hidden;
}

.page-about .ab-meter__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
  transition: background 0.18s ease;
}

.page-about .ab-meter__fill--full { width: 100%; }
.page-about .ab-meter__fill--76 { width: 76%; }
.page-about .ab-meter__fill--68 { width: 68%; }
.page-about .ab-meter__fill--99 { width: 99%; }
.page-about .ab-meter__fill--96 { width: 96%; }

.page-about .ab-meter__item:hover {
  border-bottom-color: var(--line-strong);
}

.page-about .ab-meter__item:hover .ab-meter__name {
  color: var(--ivory);
}

.page-about .ab-meter__item:hover .ab-meter__fill {
  background: linear-gradient(90deg, var(--teal), var(--signal));
}

.page-about .ab-reach__aside {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(18, 50, 71, 0.85), rgba(11, 34, 51, 0.72));
}

.page-about .ab-reach__aside-label {
  margin: 0 0 6px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ash);
}

.page-about .ab-reach__stat {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .ab-reach__stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .ab-reach__stat span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ash);
}

/* 去向 */
.page-about .ab-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-next__lead .zk-title--md {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.03em;
  max-width: 20ch;
}

.page-about .ab-next__links {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-next__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  color: var(--ivory);
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .ab-next__links a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--ash);
  transition: transform 0.16s ease, color 0.16s ease;
}

.page-about .ab-next__links a:hover,
.page-about .ab-next__links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: rgba(49, 230, 214, 0.45);
}

.page-about .ab-next__links a:hover::after,
.page-about .ab-next__links a:focus-visible::after {
  color: var(--cyan);
  transform: translateX(4px);
}

.page-about .ab-top {
  display: inline-block;
  margin-top: clamp(26px, 4vw, 40px);
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ash);
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.page-about .ab-top:hover,
.page-about .ab-top:focus-visible {
  color: var(--cyan);
  border-color: rgba(49, 230, 214, 0.5);
}

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

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

  .page-about .ab-cadence__line {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(28px, 5vw, 56px);
  }
}

/* 桌面 */
@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .ab-catalog__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-reach__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-layers__row {
    grid-template-columns: 88px minmax(0, 1fr) auto;
    gap: 16px;
  }
}

@media (min-width: 780px) {
  .page-about .ab-track__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 0 36px;
  }

  .page-about .ab-track__year {
    padding-left: 24px;
    padding-top: 2px;
    font-size: 15px;
  }

  .page-about .ab-track__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 10px;
    bottom: 30px;
    width: 1px;
    background: linear-gradient(to bottom, rgba(49, 230, 214, 0.45), rgba(233, 237, 242, 0.07));
    pointer-events: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}