.page-about {
  font-family: var(--font-display);
  background: var(--ink);
  color: var(--white);
  padding-inline: var(--pad-x);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about .about-crumb {
  max-width: var(--shell);
  margin-inline: auto;
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 8px;
  color: var(--grid);
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .about-crumb-current {
  color: var(--white);
}

.page-about .about-hero,
.page-about .about-sec {
  max-width: var(--shell);
  margin-inline: auto;
}

.page-about .about-hero {
  padding-block: clamp(26px, 5vw, 56px) clamp(34px, 6vw, 72px);
  border-bottom: 1px solid var(--grid);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0;
  font-size: clamp(34px, 5.4vw, 66px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-lead {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink);
}

.page-about .about-stat-num {
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .about-stat-label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-sec {
  padding-block: clamp(44px, 7vw, 88px);
  border-bottom: 1px solid var(--grid);
}

.page-about .about-sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-vnote {
  flex: 0 0 auto;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  border-left: 1px solid var(--grid);
  padding-left: 8px;
  min-height: 96px;
}

.page-about .about-sec-text {
  min-width: 0;
}

.page-about .about-h2 {
  margin: 0;
  font-size: clamp(23px, 3vw, 38px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-sub {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* 图文容器 */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .media-frame {
  border: 1px solid var(--grid);
  overflow: hidden;
  background: var(--panel);
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-figure--map {
  margin-bottom: clamp(20px, 3vw, 32px);
}

/* 内容地图 */
.page-about .about-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .map-cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 30px);
  background: var(--panel);
  border-left: 2px solid transparent;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .map-cell:hover,
.page-about .map-cell:focus-visible {
  border-left-color: var(--cyan);
  background: #0e2620;
  outline: none;
}

.page-about .map-cell:focus-visible {
  box-shadow: inset 0 0 0 1px var(--cyan);
}

.page-about .map-num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-deep);
}

.page-about .map-title {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .map-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .map-meta {
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
  opacity: 0.6;
  transition: opacity 0.18s ease, color 0.18s ease;
}

.page-about .map-cell:hover .map-meta,
.page-about .map-cell:focus-visible .map-meta {
  opacity: 1;
  color: var(--cyan);
}

/* 团队分工 */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .team-matrix {
  border-top: 1px solid var(--grid);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding-block: 14px;
  border-bottom: 1px solid var(--grid);
}

.page-about .team-id {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .team-code {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-deep);
}

.page-about .team-role {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-size {
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .team-duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--grid) 70%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 26px;
  padding-bottom: 14px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--cyan);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .tl-card {
  background: var(--panel);
  border: 1px solid var(--grid);
}

.page-about .tl-card[open] {
  border-color: var(--cyan-deep);
}

.page-about .tl-summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-summary:hover .tl-title,
.page-about .tl-summary:focus-visible .tl-title {
  color: var(--cyan);
}

.page-about .tl-summary:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -1px;
}

.page-about .tl-card[open] .tl-summary {
  border-bottom: 1px solid var(--grid);
}

.page-about .tl-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
  transition: color 0.18s ease;
}

.page-about .tl-hint {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .tl-points {
  margin: 0;
  padding: 12px 16px 14px 30px;
}

.page-about .tl-points li {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .tl-points li:last-child {
  margin-bottom: 0;
}

/* 合作生态 */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .partner-col {
  background: var(--ink);
  padding: clamp(18px, 3vw, 28px);
}

.page-about .partner-title {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--gold);
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .partner-list li:last-child {
  margin-bottom: 0;
}

.page-about .partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

/* 服务标准 */
.page-about .about-facts {
  margin: 0;
  border-top: 1px solid var(--grid);
}

.page-about .fact-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding-block: 14px;
  border-bottom: 1px solid var(--grid);
}

.page-about .fact-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .fact-val {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--panel);
  border-left: 2px solid var(--gold);
}

.page-about .about-cta-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--white);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .fact-row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

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

@media (min-width: 760px) {
  .page-about .about-map {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .map-cell--a {
    grid-column: span 7;
  }

  .page-about .map-cell--b {
    grid-column: span 5;
  }

  .page-about .map-cell--c {
    grid-column: span 5;
  }

  .page-about .map-cell--d {
    grid-column: span 7;
  }

  .page-about .about-timeline::before {
    left: 112px;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: 48px;
    padding-left: 0;
    padding-bottom: 18px;
  }

  .page-about .tl-item::before {
    left: 107px;
  }

  .page-about .tl-year {
    margin-bottom: 0;
    padding-top: 12px;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about {
    padding-left: calc(var(--rail-w) + var(--pad-x));
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-figure--team {
    position: sticky;
    top: 24px;
  }
}

@media (max-width: 719px) {
  .page-about .about-sec-head {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-vnote {
    writing-mode: horizontal-tb;
    min-height: 0;
    border-left: 0;
    border-bottom: 1px solid var(--grid);
    padding-left: 0;
    padding-bottom: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .map-cell,
  .page-about .map-meta,
  .page-about .tl-title {
    transition: none;
  }
}
<<<END>>>