.page-about {
  --ab-rail: 236px;
  --ab-gap: clamp(20px, 3.2vw, 44px);
  --ab-sec-space: clamp(44px, 6vw, 80px);
  background: var(--ink);
  color: var(--ice);
  font-family: var(--font-sans);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-block: 14px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
}

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

.page-about .breadcrumb__sep {
  margin-inline: 8px;
  color: var(--graphite);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  margin-top: 14px;
  padding: clamp(26px, 5vw, 60px) 0 clamp(46px, 7vw, 88px);
  background:
    linear-gradient(148deg, rgba(31, 78, 121, 0.62), rgba(10, 27, 42, 0) 62%),
    repeating-linear-gradient(90deg, rgba(47, 62, 78, 0.35) 0 1px, transparent 1px 92px),
    var(--ink-deep);
  border-top: var(--bw) solid var(--graphite);
  border-bottom: var(--bw) solid var(--graphite);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 94%);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

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

.page-about .ab-hero .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 10px;
  background: var(--orange);
  color: var(--ink-deep);
  font-family: var(--font-cond);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.page-about .ab-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-hero__lead {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--silver);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-stat {
  padding: 16px 18px;
  border-left: var(--bw) solid var(--graphite);
  border-top: var(--bw) solid var(--graphite);
}

.page-about .ab-stat:nth-child(-n + 2) {
  border-top: 0;
}

.page-about .ab-stat:nth-child(odd) {
  border-left: 0;
}

.page-about .ab-stat__label {
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .ab-stat__value {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 26px);
  font-weight: 600;
  color: var(--green);
}

.page-about .ab-stat__value--alt {
  color: var(--orange);
}

/* ---------- 主布局 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: var(--ab-gap);
  padding-block: clamp(26px, 4vw, 52px) clamp(40px, 6vw, 76px);
}

/* ---------- 侧边档案索引 ---------- */
.page-about .ab-rail {
  min-width: 0;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  padding: 16px;
}

.page-about .ab-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  border: var(--bw) solid var(--graphite);
  color: var(--ice);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, background-color 160ms ease;
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  border-color: var(--green);
  color: var(--green);
  background: rgba(46, 230, 166, 0.07);
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-about .ab-rail__copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  margin-top: 14px;
  padding: 10px 12px;
  border: var(--bw) solid var(--archive);
  background: transparent;
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 12px;
  text-align: left;
  cursor: pointer;
}

.page-about .ab-rail__copy:hover {
  border-color: var(--green);
}

.page-about .ab-rail__copy-label {
  font-family: var(--font-cond);
  letter-spacing: 0.18em;
  color: var(--silver);
}

.page-about .ab-rail__copy-mail {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green);
  word-break: break-all;
}

/* ---------- 区块通用 ---------- */
.page-about .ab-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--ab-sec-space);
}

.page-about .ab-sec {
  position: relative;
  min-width: 0;
  padding-left: clamp(14px, 2.4vw, 28px);
  border-left: var(--bw) solid var(--graphite);
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(168, 179, 189, 0.22);
}

.page-about .ab-sec__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--orange);
}

.page-about .ab-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 3.1vw, 32px);
  line-height: 1.32;
  color: var(--ice);
}

.page-about .ab-lead {
  max-width: 72ch;
  margin: 0 0 24px;
  font-size: 15px;
  color: var(--silver);
}

.page-about .ab-links {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--silver);
}

.page-about .ab-links a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 166, 0.45);
}

.page-about .ab-links a:hover {
  border-bottom-color: var(--green);
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0 0 24px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-bottom: var(--bw) solid var(--graphite);
  filter: saturate(0.9) contrast(1.05);
}

.page-about .ab-figure__cap {
  padding: 10px 14px;
  font-size: 12px;
  color: var(--silver);
  line-height: 1.6;
}

/* ---------- 01 要点 ---------- */
.page-about .ab-points {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-point {
  padding: 16px 18px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.page-about .ab-point:hover {
  border-color: var(--archive);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-point__title {
  margin: 0 0 6px;
  font-family: var(--font-cond);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--green);
}

.page-about .ab-point__text {
  margin: 0;
  font-size: 14px;
  color: var(--silver);
}

/* ---------- 02 目录网格 ---------- */
.page-about .ab-dir {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-dir__item {
  position: relative;
  padding: 16px 18px 18px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  transition: transform 180ms ease, border-color 180ms ease;
}

.page-about .ab-dir__item:hover {
  transform: translateY(-3px);
  border-color: var(--archive);
}

.page-about .ab-dir__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange);
}

.page-about .ab-dir__name {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .ab-dir__text {
  margin: 0;
  font-size: 13.5px;
  color: var(--silver);
}

.page-about .ab-dir__item.is-key {
  border-color: var(--green);
  background: linear-gradient(160deg, rgba(46, 230, 166, 0.12), rgba(16, 42, 67, 0.9));
  box-shadow: 6px 6px 0 rgba(46, 230, 166, 0.25);
}

.page-about .ab-dir__item.is-key .ab-dir__num {
  color: var(--mint);
}

.page-about .ab-dir__item.is-key .ab-dir__name {
  color: var(--mint);
}

.page-about .ab-tag {
  display: inline-block;
  margin-top: 10px;
  padding: 2px 8px;
  border: 1px solid var(--green);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--green);
}

/* ---------- 03 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  padding-left: 22px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--green), var(--archive) 45%, var(--graphite));
}

.page-about .ab-node {
  position: relative;
  margin-bottom: 12px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 10px;
  height: 10px;
  margin-left: 1px;
  border: 2px solid var(--silver);
  background: var(--ink-deep);
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .ab-node[open]::before {
  border-color: var(--green);
  background: var(--green);
}

.page-about .ab-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node__summary:hover {
  background: rgba(31, 78, 121, 0.22);
}

.page-about .ab-node__ver {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--orange);
}

.page-about .ab-node__label {
  flex: 1 1 180px;
  min-width: 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--ice);
}

.page-about .ab-node__state {
  flex: none;
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .ab-node__state--done {
  border: 1px solid var(--silver);
  color: var(--silver);
}

.page-about .ab-node__state--live {
  border: 1px solid var(--green);
  color: var(--mint);
  background: rgba(46, 230, 166, 0.12);
}

.page-about .ab-node__body {
  padding: 0 16px 16px;
  border-top: 1px solid rgba(168, 179, 189, 0.22);
}

.page-about .ab-node__body p {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--silver);
}

/* ---------- 04 团队 ---------- */
.page-about .ab-team {
  margin-bottom: 24px;
  padding: 16px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
}

.page-about .ab-bar {
  display: flex;
  height: 20px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-deep);
}

.page-about .ab-bar__seg {
  height: 100%;
  border-right: 1px solid var(--ink-deep);
}

.page-about .ab-bar__seg:last-child {
  border-right: 0;
}

.page-about .ab-bar__seg--edit {
  flex: 14 1 0;
  background: var(--green);
}

.page-about .ab-bar__seg--data {
  flex: 9 1 0;
  background: var(--archive);
}

.page-about .ab-bar__seg--build {
  flex: 7 1 0;
  background: var(--orange);
}

.page-about .ab-bar__seg--care {
  flex: 5 1 0;
  background: var(--silver);
}

.page-about .ab-legend {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-legend li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--silver);
}

.page-about .ab-legend__dot {
  flex: none;
  width: 10px;
  height: 10px;
  border: 1px solid var(--ink-deep);
}

.page-about .ab-legend__dot--edit {
  background: var(--green);
}

.page-about .ab-legend__dot--data {
  background: var(--archive);
}

.page-about .ab-legend__dot--build {
  background: var(--orange);
}

.page-about .ab-legend__dot--care {
  background: var(--silver);
}

.page-about .ab-quality {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-quality__item {
  padding: 16px 18px;
  border-left: 3px solid var(--orange);
  background: rgba(16, 42, 67, 0.75);
}

.page-about .ab-quality__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--orange);
}

.page-about .ab-quality__title {
  margin: 4px 0 6px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .ab-quality__item p {
  margin: 0;
  font-size: 13.5px;
  color: var(--silver);
}

/* ---------- 05 合作生态 ---------- */
.page-about .ab-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-eco__group {
  padding: 18px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  transition: border-color 180ms ease;
}

.page-about .ab-eco__group:hover {
  border-color: var(--green);
}

.page-about .ab-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--green);
}

.page-about .ab-eco__label {
  margin: 8px 0 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ice);
}

.page-about .ab-eco__text {
  margin: 0;
  font-size: 13.5px;
  color: var(--silver);
}

.page-about .ab-honor {
  margin-top: 24px;
  padding: 18px;
  border: var(--bw) dashed var(--archive);
  background: linear-gradient(135deg, rgba(31, 78, 121, 0.3), rgba(10, 27, 42, 0.6));
}

.page-about .ab-honor__intro {
  margin: 0 0 12px;
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .ab-honor__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-honor__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(168, 179, 189, 0.2);
}

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

.page-about .ab-honor__code {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
}

.page-about .ab-honor__item p {
  margin: 0;
  font-size: 14px;
  color: var(--ice);
}

/* ---------- 06 更新节奏与联系 ---------- */
.page-about .ab-rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .ab-rhythm__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 12px 16px;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
}

.page-about .ab-rhythm__time {
  flex: none;
  min-width: 74px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mint);
}

.page-about .ab-rhythm__item p {
  margin: 0;
  font-size: 13.5px;
  color: var(--silver);
}

.page-about .ab-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border: var(--bw) solid var(--graphite);
  background: var(--ink-2);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-contact__main {
  padding: 20px;
}

.page-about .ab-contact__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ice);
}

.page-about .ab-contact__main p {
  margin: 0 0 18px;
  font-size: 14px;
  color: var(--silver);
}

.page-about .ab-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-contact__facts {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 20px;
  border-top: var(--bw) solid var(--graphite);
  background: var(--ink-deep);
}

.page-about .ab-contact__facts dt {
  font-family: var(--font-cond);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .ab-contact__facts dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ice);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-dir {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-rail__link {
    white-space: normal;
  }

  .page-about .ab-sec {
    padding-left: clamp(22px, 2.8vw, 36px);
  }

  .page-about .ab-contact {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .ab-contact__facts {
    border-top: 0;
    border-left: var(--bw) solid var(--graphite);
    align-content: start;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-dir {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-dir__item,
  .page-about .ab-point,
  .page-about .ab-eco__group,
  .page-about .ab-rail__link,
  .page-about .ab-node::before {
    transition: none;
  }

  .page-about .ab-dir__item:hover {
    transform: none;
  }
}
<<<END>>>