.page-about {
  --ab-line: 1px solid var(--k-line-soft);
  --ab-aside-w: 19rem;
  position: relative;
  background-color: var(--k-bg);
  background-image: linear-gradient(var(--k-grid-line) 1px, transparent 1px);
  background-size: 100% 96px;
  color: var(--k-white);
  overflow-x: clip;
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .ab-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--k-fs-xs);
  letter-spacing: 0.1em;
  color: var(--k-muted);
  padding-top: clamp(20px, 3vw, 34px);
  position: relative;
  z-index: 1;
}

.page-about .ab-crumb a {
  color: var(--k-muted);
  text-decoration: none;
  transition: color 0.25s var(--k-ease);
}

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

.page-about .ab-crumb__sep {
  color: var(--k-line);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  z-index: 1;
  padding-bottom: clamp(40px, 6vw, 76px);
  border-bottom: var(--ab-line);
}

.page-about .ab-hero__wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--k-gap-md);
  margin-top: clamp(26px, 4vw, 48px);
}

.page-about .ab-hero__title {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 26px);
}

.page-about .ab-hero__vlabel {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  white-space: nowrap;
  font-size: var(--k-fs-xs);
  letter-spacing: 0.2em;
  color: var(--k-muted);
  padding-top: 10px;
}

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

.page-about .ab-h1 {
  margin: 14px 0 0;
  font-family: var(--k-font-sans);
  font-size: clamp(34px, 6.2vw, 72px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.page-about .ab-h1 span {
  color: var(--k-neon);
}

.page-about .ab-hero__media {
  margin: 0;
  border: var(--ab-line);
  border-radius: var(--k-r-3) var(--k-r-1) var(--k-r-4) var(--k-r-1);
  overflow: hidden;
  background: var(--k-panel);
}

.page-about .ab-hero__media .k-media__img {
  display: block;
}

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

.page-about .ab-hero__foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--k-gap-sm);
  margin-top: var(--k-gap-md);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 40em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--k-white);
}

.page-about .ab-note {
  border: var(--ab-line);
  border-radius: var(--k-r-2) var(--k-r-1) var(--k-r-2) var(--k-r-1);
  background: var(--k-panel);
  padding: 14px 18px;
  align-self: start;
}

.page-about .ab-note summary {
  cursor: pointer;
  list-style: none;
  font-size: var(--k-fs-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--k-neon);
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.page-about .ab-note summary::before {
  content: "+";
  font-family: var(--k-font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--k-signal);
}

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

.page-about .ab-note p {
  margin: 12px 0 2px;
  font-size: var(--k-fs-sm);
  line-height: 1.8;
  color: var(--k-muted);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: var(--k-gap-md) 0 0;
  background: var(--k-line);
  border: var(--ab-line);
  border-radius: var(--k-r-2) var(--k-r-1) var(--k-r-2) var(--k-r-1);
  overflow: hidden;
}

.page-about .ab-stats__item {
  background: var(--k-panel);
  padding: 18px 20px;
}

.page-about .ab-stats dt {
  margin: 0;
  font-size: var(--k-fs-xs);
  letter-spacing: 0.16em;
  color: var(--k-muted);
}

.page-about .ab-stats dd {
  margin: 8px 0 0;
  font-family: var(--k-font-mono);
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
  color: var(--k-white);
  font-variant-numeric: tabular-nums;
}

/* ---------- 通用区块 ---------- */

.page-about .ab-section {
  position: relative;
  z-index: 1;
  padding: clamp(48px, 7vw, 84px) 0;
  border-bottom: var(--ab-line);
}

.page-about > .ab-section:last-child {
  border-bottom: 0;
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .ab-lead {
  margin: var(--k-gap-sm) 0 0;
  max-width: 42em;
  font-size: var(--k-fs-base);
  line-height: 1.85;
  color: var(--k-muted);
}

.page-about .ab-prose {
  max-width: 42em;
  margin-top: var(--k-gap-sm);
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  font-size: var(--k-fs-base);
  line-height: 1.85;
  color: var(--k-white);
}

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

.page-about .ab-two {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--k-gap-md);
}

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

.page-about .ab-more {
  margin: var(--k-gap-sm) 0 0;
  font-size: var(--k-fs-sm);
}

.page-about .ab-more__link {
  display: inline-block;
  color: var(--k-neon);
  text-decoration: none;
  padding-bottom: 2px;
  background-image: linear-gradient(var(--k-neon), var(--k-neon));
  background-repeat: no-repeat;
  background-size: 0 1px;
  background-position: 0 100%;
  transition: background-size 0.35s var(--k-ease), color 0.25s var(--k-ease);
}

.page-about .ab-more__link:hover {
  background-size: 100% 1px;
}

/* ---------- 场景列表 ---------- */

.page-about .ab-scenes {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .ab-scenes li {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  font-size: var(--k-fs-sm);
  line-height: 1.75;
  color: var(--k-white);
  border-top: 1px solid var(--k-line-soft);
}

.page-about .ab-scenes li:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ab-scenes .k-num {
  color: var(--k-neon);
  font-size: var(--k-fs-xs);
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 三层内容 ---------- */

.page-about .ab-layers {
  list-style: none;
  margin: var(--k-gap-md) 0 0;
  padding: 0;
  border-top: var(--ab-line);
}

.page-about .ab-layers__item {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 26px 0;
  border-bottom: var(--ab-line);
  transition: background 0.4s var(--k-ease);
}

.page-about .ab-layers__item::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--k-neon);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.45s var(--k-ease);
}

.page-about .ab-layers__item--2::before {
  background: var(--k-violet);
}

.page-about .ab-layers__item--3::before {
  background: var(--k-signal);
}

.page-about .ab-layers__item:hover::before {
  transform: scaleY(1);
}

.page-about .ab-layers__idx {
  font-family: var(--k-font-mono);
  font-size: var(--k-fs-sm);
  font-weight: 600;
  color: var(--k-muted);
  padding-top: 6px;
}

.page-about .ab-layers__body h3 {
  margin: 0;
  font-size: var(--k-fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-layers__body p {
  margin: 10px 0 0;
  max-width: 44em;
  font-size: var(--k-fs-base);
  line-height: 1.85;
  color: var(--k-muted);
}

.page-about .ab-layers__more {
  grid-column: 2;
  justify-self: start;
  font-size: var(--k-fs-sm);
  color: var(--k-white);
  text-decoration: none;
  padding-bottom: 2px;
  background-image: linear-gradient(var(--k-neon), var(--k-neon));
  background-repeat: no-repeat;
  background-size: 0 1px;
  background-position: 0 100%;
  transition: background-size 0.35s var(--k-ease), color 0.25s var(--k-ease);
}

.page-about .ab-layers__more:hover {
  color: var(--k-neon);
  background-size: 100% 1px;
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--k-gap-sm);
  margin-top: var(--k-gap-md);
}

.page-about .ab-team__card {
  border: var(--ab-line);
  border-radius: var(--k-r-3) var(--k-r-1) var(--k-r-3) var(--k-r-1);
  background: var(--k-panel);
  padding: 26px clamp(18px, 3vw, 30px);
  transition: border-color 0.35s var(--k-ease);
}

.page-about .ab-team__card--edit:hover {
  border-color: var(--k-neon);
}

.page-about .ab-team__card--tech:hover {
  border-color: var(--k-violet);
}

.page-about .ab-team__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .ab-team__top h3 {
  margin: 0;
  font-size: var(--k-fs-md);
  font-weight: 800;
}

.page-about .ab-team__num {
  font-family: var(--k-font-mono);
  font-size: clamp(36px, 5.5vw, 56px);
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-team__card--edit .ab-team__num {
  color: var(--k-neon);
}

.page-about .ab-team__card--tech .ab-team__num {
  color: var(--k-violet);
}

.page-about .ab-team__bar {
  height: 6px;
  margin: 20px 0 18px;
  background: var(--k-line);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .ab-team__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  transform-origin: left center;
}

.page-about .ab-team__fill--edit {
  width: 35%;
  background: var(--k-neon);
}

.page-about .ab-team__fill--tech {
  width: 65%;
  background: var(--k-violet);
}

.page-about .ab-team__card p {
  margin: 0;
  max-width: 40em;
  font-size: var(--k-fs-base);
  line-height: 1.85;
  color: var(--k-muted);
}

/* ---------- 核验流程 ---------- */

.page-about .ab-steps {
  position: relative;
  list-style: none;
  margin: var(--k-gap-md) 0 0;
  padding: 0;
  display: grid;
  gap: var(--k-gap-md);
}

.page-about .ab-steps__rail {
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 6px;
  z-index: 0;
}

.page-about .ab-steps__item {
  position: relative;
  z-index: 1;
  padding-left: 40px;
}

.page-about .ab-steps__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 4px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--k-bg);
  border: 2px solid var(--k-neon);
  box-shadow: 0 0 0 4px rgba(43, 227, 176, 0.1);
}

.page-about .ab-steps__item h3 {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: var(--k-fs-md);
  font-weight: 800;
}

.page-about .ab-steps__item h3 .k-num {
  font-family: var(--k-font-mono);
  font-size: var(--k-fs-xs);
  font-weight: 600;
  color: var(--k-neon);
  letter-spacing: 0.08em;
}

.page-about .ab-steps__item p {
  margin: 10px 0 0;
  max-width: 42em;
  font-size: var(--k-fs-base);
  line-height: 1.85;
  color: var(--k-muted);
}

.page-about .ab-spy {
  display: grid;
  gap: 2px;
  margin-top: 14px;
}

.page-about .ab-spy__link {
  display: block;
  padding: 9px 0 9px 14px;
  font-size: var(--k-fs-sm);
  color: var(--k-muted);
  text-decoration: none;
  border-left: 2px solid var(--k-line);
  transition: color 0.25s var(--k-ease), border-color 0.25s var(--k-ease),
    padding-left 0.25s var(--k-ease);
}

.page-about .ab-spy__link:hover {
  color: var(--k-white);
  border-color: var(--k-signal);
  padding-left: 18px;
}

.page-about .ab-spy__link[aria-current="true"] {
  color: var(--k-neon);
  border-color: var(--k-neon);
  padding-left: 18px;
}

.page-about .ab-verify__media {
  margin: 26px 0 0;
  border: var(--ab-line);
  border-radius: var(--k-r-2) var(--k-r-1) var(--k-r-2) var(--k-r-1);
  overflow: hidden;
  background: var(--k-panel);
}

.page-about .ab-verify__media .k-media__img {
  display: block;
}

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

.page-about .ab-verify__media .k-media__cap {
  display: block;
  padding: 10px 14px;
  font-size: var(--k-fs-xs);
  letter-spacing: 0.06em;
  color: var(--k-muted);
  border-top: 1px solid var(--k-line-soft);
}

/* ---------- 归档 ---------- */

.page-about .ab-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--k-gap-md);
}

.page-about .ab-archive__list {
  list-style: none;
  margin: var(--k-gap-sm) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .ab-archive__list li {
  position: relative;
  padding: 11px 0 11px 22px;
  font-size: var(--k-fs-sm);
  line-height: 1.75;
  color: var(--k-white);
  border-top: 1px solid var(--k-line-soft);
}

.page-about .ab-archive__list li:first-child {
  border-top: 0;
}

.page-about .ab-archive__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 10px;
  height: 2px;
  background: var(--k-signal);
}

.page-about .ab-archive__media {
  margin: 0;
  border: var(--ab-line);
  border-radius: var(--k-r-4) var(--k-r-1) var(--k-r-3) var(--k-r-1);
  overflow: hidden;
  background: var(--k-panel);
  align-self: start;
}

.page-about .ab-archive__media .k-media__img {
  display: block;
}

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

.page-about .ab-archive__media .k-media__cap {
  display: block;
  padding: 10px 16px;
  font-size: var(--k-fs-xs);
  letter-spacing: 0.06em;
  color: var(--k-muted);
  border-top: 1px solid var(--k-line-soft);
}

/* ---------- 发展路线 ---------- */

.page-about .ab-route {
  list-style: none;
  margin: var(--k-gap-md) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--k-line-soft);
  border-top: var(--ab-line);
}

.page-about .ab-route__item {
  position: relative;
  background: var(--k-bg);
  padding: 24px 4px 26px;
}

.page-about .ab-route__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 2px;
  background: var(--k-neon);
}

.page-about .ab-route__stage {
  display: block;
  font-family: var(--k-font-mono);
  font-size: var(--k-fs-xs);
  letter-spacing: 0.16em;
  color: var(--k-signal);
}

.page-about .ab-route__item h3 {
  margin: 12px 0 0;
  font-size: var(--k-fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-route__item p {
  margin: 10px 0 0;
  max-width: 28em;
  font-size: var(--k-fs-sm);
  line-height: 1.8;
  color: var(--k-muted);
}

/* ---------- 行动区 ---------- */

.page-about .ab-cta__box {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--k-gap-md);
  padding: clamp(26px, 4vw, 44px);
  border: var(--ab-line);
  border-radius: var(--k-r-4) var(--k-r-1) var(--k-r-4) var(--k-r-1);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(43, 227, 176, 0.1), transparent 58%),
    var(--k-panel);
}

.page-about .ab-cta__title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.page-about .ab-cta__copy p {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: var(--k-fs-base);
  line-height: 1.85;
  color: var(--k-muted);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 显现动效 ---------- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--k-ease), transform 0.6s var(--k-ease);
}

.page-about [data-reveal][data-visible="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

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

  .page-about .ab-hero__foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 20rem);
    gap: var(--k-gap-md);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__wrap {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: var(--k-gap-lg);
    align-items: end;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--k-gap-md);
  }

  .page-about .ab-archive {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--k-gap-lg);
    align-items: start;
  }

  .page-about .ab-layers__item {
    grid-template-columns: 60px minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    padding: 30px 0;
  }

  .page-about .ab-layers__more {
    grid-column: 3;
    justify-self: end;
    padding-top: 6px;
  }

  .page-about .ab-route {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-route__item {
    padding: 26px 22px 30px;
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .ab-two {
    grid-template-columns: minmax(0, 1fr) minmax(0, var(--ab-aside-w));
    gap: var(--k-gap-lg);
  }
}

@media (max-width: 699px) {
  .page-about .ab-hero__vlabel {
    display: none;
  }

  .page-about .ab-layers__item::before {
    left: -8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .ab-layers__item::before,
  .page-about .ab-more__link,
  .page-about .ab-layers__more,
  .page-about .ab-spy__link {
    transition: none;
  }
}