.page-about {
  --about-rule: 3px solid var(--ink-900);
  --about-space: clamp(2rem, 5vw, 3.5rem);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  background: var(--snow);
  border-bottom: var(--about-rule);
  padding: .9rem 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: var(--about-rule);
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-block: clamp(2.75rem, 7vw, 6rem);
}

.page-about .about-hero .eyebrow {
  color: var(--signal);
}

.page-about .about-title {
  margin: .85rem 0 0;
  font-size: clamp(2.1rem, 6.4vw, 4.5rem);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-lede {
  margin: 0;
  color: var(--mist);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.78;
}

.page-about .about-hero-acts {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero .btn-line {
  border-color: var(--mist);
  color: var(--snow);
}

.page-about .about-hero .btn-line:hover,
.page-about .about-hero .btn-line:focus-visible {
  background: var(--snow);
  color: var(--ink-900);
  border-color: var(--snow);
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
    align-items: end;
    column-gap: clamp(2rem, 5vw, 4.5rem);
  }
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  border-bottom: var(--about-rule);
}

.page-about .about-tl-view {
  margin: var(--about-space) 0 0;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
}

.page-about .about-tl-view img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}

.page-about .about-tl {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  margin-top: var(--about-space);
}

.page-about .about-tl-rail {
  list-style: none;
  margin: 0;
  padding: 0 0 .6rem;
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  border-bottom: 2px solid var(--mist);
}

.page-about .about-tl-rail .about-tl-link {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  flex: 0 0 auto;
  padding: .45rem .7rem;
  border: 2px solid transparent;
  color: var(--rock);
  text-decoration: none;
  font-family: var(--font-mono);
  white-space: nowrap;
  transition: color .22s var(--ease), background-color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-tl-rail .about-tl-link:hover,
.page-about .about-tl-rail .about-tl-link:focus-visible {
  color: var(--ink-900);
  border-color: var(--ink-900);
}

.page-about .about-tl-rail .about-tl-link[aria-current="true"] {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--signal);
}

.page-about .about-tl-year {
  font-weight: 700;
  font-size: .95rem;
}

.page-about .about-tl-label {
  font-size: .72rem;
  letter-spacing: .08em;
  opacity: .85;
}

.page-about .about-tl-body {
  display: grid;
  gap: clamp(2.25rem, 5vw, 3.75rem);
}

.page-about .about-tl-entry {
  max-width: 64ch;
  scroll-margin-top: 140px;
}

.page-about .about-tl-mark {
  display: flex;
  align-items: center;
  gap: .85rem;
  margin: 0 0 .7rem;
}

.page-about .about-tl-mark-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .1em;
  background: var(--ink-900);
  color: var(--signal);
  padding: .22rem .55rem;
}

.page-about .about-tl-rule {
  display: block;
  width: 46px;
  height: 3px;
  background: var(--pulse);
}

.page-about .about-tl-entry-title {
  margin: 0 0 .55rem;
  font-size: clamp(1.3rem, 2.5vw, 1.85rem);
  font-weight: 900;
  line-height: 1.28;
  color: var(--graphite);
}

.page-about .about-tl-entry p {
  margin: 0;
  color: var(--graphite);
  line-height: 1.78;
}

@media (min-width: 900px) {
  .page-about .about-tl {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-tl-rail {
    display: block;
    position: sticky;
    top: 128px;
    align-self: start;
    overflow: visible;
    border-bottom: 0;
    border-left: var(--about-rule);
    padding: 0 0 0 1rem;
  }

  .page-about .about-tl-rail > li + li {
    margin-top: .55rem;
  }

  .page-about .about-tl-rail .about-tl-link {
    display: flex;
    width: 100%;
    justify-content: flex-start;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .about-teams-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: var(--about-space);
}

.page-about .about-teams-photo {
  margin: 0;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
}

.page-about .about-teams-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06);
}

.page-about .about-team {
  background: #ffffff;
  border: var(--about-rule);
  box-shadow: var(--shadow-soft);
  margin-bottom: 1.15rem;
}

.page-about .about-team:last-child {
  margin-bottom: 0;
}

.page-about .about-team--edit {
  border-left: 8px solid var(--signal);
}

.page-about .about-team--dev {
  border-left: 8px solid var(--ice);
}

.page-about .about-team--care {
  border-left: 8px solid var(--pulse);
}

.page-about .about-team-head {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .2rem 1rem;
  align-items: baseline;
  padding: 1.1rem 3rem 1.1rem 1.15rem;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team-head::-webkit-details-marker {
  display: none;
}

.page-about .about-team-head::after {
  content: "+";
  position: absolute;
  right: 1.05rem;
  top: 1rem;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-900);
}

.page-about .about-team[open] .about-team-head::after {
  content: "–";
}

.page-about .about-team-head:focus-visible {
  outline: 3px solid var(--ice);
  outline-offset: -3px;
}

.page-about .about-team-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.55rem, 3.4vw, 2.2rem);
  line-height: 1;
  color: var(--ink-900);
}

.page-about .about-team-name {
  font-size: 1.12rem;
  font-weight: 900;
  color: var(--graphite);
}

.page-about .about-team-role {
  grid-column: 2;
  font-size: .84rem;
  color: var(--rock);
  line-height: 1.6;
}

.page-about .about-team-body {
  padding: 1rem 1.15rem 1.3rem;
  border-top: 2px dashed var(--mist);
}

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

.page-about .about-team-list li {
  position: relative;
  padding-left: 1.35rem;
  margin-bottom: .55rem;
  font-size: .95rem;
  line-height: 1.72;
  color: var(--graphite);
}

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

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 13px;
  height: 3px;
  background: var(--pulse);
}

@media (min-width: 1000px) {
  .page-about .about-teams-grid {
    grid-template-columns: minmax(0, 36fr) minmax(0, 64fr);
    align-items: start;
  }
}

/* ---------- 内容生产 ---------- */
.page-about .about-flow-lede {
  margin-top: 1rem;
  color: var(--graphite);
}

.page-about .about-flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: var(--about-space);
}

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

.page-about .about-flow-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .2rem 1.1rem;
  padding: 1.1rem 0;
  border-bottom: 2px solid var(--mist);
}

.page-about .about-flow-step:first-child {
  border-top: 2px solid var(--mist);
}

.page-about .about-flow-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .06em;
  color: var(--pulse);
  padding-top: .2rem;
}

.page-about .about-flow-name {
  margin: 0 0 .3rem;
  font-size: 1.08rem;
  font-weight: 900;
  color: var(--graphite);
}

.page-about .about-flow-step p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-flow-media {
  margin: 0;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  align-self: start;
}

.page-about .about-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: contain;
  background: var(--snow);
}

@media (min-width: 1000px) {
  .page-about .about-flow-grid {
    grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
  }
}

/* ---------- 覆盖与访问高峰 ---------- */
.page-about .about-reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: var(--about-space);
}

.page-about .about-reach-copy p {
  color: var(--mist);
  line-height: 1.8;
  margin: 0 0 1rem;
}

.page-about .about-reach-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-chart-wrap {
  border: 3px solid var(--ink-700);
  background: var(--ink-900);
  padding: clamp(.85rem, 2vw, 1.4rem);
  box-shadow: 6px 6px 0 rgba(168, 255, 62, .22);
}

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart-grid line {
  stroke: rgba(201, 214, 232, .14);
  stroke-width: 1;
}

.page-about .about-chart-peakband {
  fill: rgba(255, 90, 43, .1);
}

.page-about .about-chart-axis {
  stroke: rgba(201, 214, 232, .35);
  stroke-width: 2;
}

.page-about .about-chart-area {
  fill: rgba(168, 255, 62, .13);
}

.page-about .about-chart-line {
  fill: none;
  stroke: var(--signal);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-chart-dots circle {
  fill: var(--ink-900);
  stroke: var(--signal);
  stroke-width: 3;
}

.page-about .about-chart-dots circle.is-peak {
  fill: var(--pulse);
  stroke: var(--pulse);
}

.page-about .about-chart-labels text {
  fill: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  text-anchor: middle;
}

.page-about .about-chart-note {
  fill: var(--pulse);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-anchor: middle;
}

.page-about .about-stats {
  list-style: none;
  margin: var(--about-space) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .about-stat {
  padding-top: .85rem;
  border-top: 3px solid var(--signal);
}

.page-about .about-stat--b {
  border-top-color: var(--pulse);
}

.page-about .about-stat--c {
  border-top-color: var(--ice);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.65rem, 4vw, 2.4rem);
  line-height: 1.1;
  color: var(--snow);
}

.page-about .about-stat-label {
  display: block;
  margin-top: .4rem;
  font-size: .9rem;
  line-height: 1.65;
  color: var(--mist);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-reach-grid {
    grid-template-columns: minmax(0, 44fr) minmax(0, 56fr);
    align-items: center;
  }
}

/* ---------- 服务与响应 ---------- */
.page-about .about-support-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  margin-top: var(--about-space);
}

.page-about .about-support-card {
  display: flex;
  flex-direction: column;
  gap: .7rem;
  border: var(--about-rule);
  background: #ffffff;
  box-shadow: var(--shadow-hard);
  padding: clamp(1.15rem, 3vw, 1.7rem);
}

.page-about .about-support-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--graphite);
}

.page-about .about-support-card p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-card-link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: .65rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: .04em;
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 3px solid var(--signal);
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

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

.page-about .about-contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
}

.page-about .about-contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .7rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .92rem;
  color: var(--ink-800);
}

.page-about .about-contact-label {
  flex: 0 0 auto;
  font-size: .72rem;
  letter-spacing: .1em;
  background: var(--ink-900);
  color: var(--signal);
  padding: .2rem .5rem;
}

.page-about .about-contact-value {
  flex: 0 1 auto;
  min-width: 0;
  word-break: break-word;
}

@media (min-width: 760px) {
  .page-about .about-support-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-support-card--wide {
    grid-column: 1 / -1;
  }
}
<<<END>>>