.page-about {
  --about-track: 84px;
  --about-line: var(--sand);
  background: var(--paper);
  color: var(--ink-900);
  overflow-x: clip;
}

.page-about .about-canvas {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 48px);
  padding-block: clamp(20px, 4vw, 40px) clamp(64px, 9vw, 110px);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: clamp(20px, 4vw, 36px);
  position: relative;
}

.page-about .about-hero__rail {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  order: -1;
}

.page-about .about-tick {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-500);
  padding: 2px 0 2px 8px;
  border-left: 2px solid var(--about-line);
  line-height: 1.5;
}

.page-about .about-tick--now {
  color: var(--rust);
  border-left-color: var(--rust);
  font-weight: 600;
}

.page-about .about-hero__body h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 66px);
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--ink-950);
  margin: 12px 0 0;
  text-wrap: balance;
  animation: about-rise 320ms ease-out both;
}

.page-about .about-hero__body .lede {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink-800);
  animation: about-rise 320ms ease-out 90ms both;
}

.page-about .about-hero__meta {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--slate-500);
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
  animation: about-rise 320ms ease-out 150ms both;
}

.page-about .about-hero__side {
  display: none;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .42em;
  color: var(--amber);
  writing-mode: vertical-rl;
  position: absolute;
  top: 4px;
  right: -6px;
}

@keyframes about-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 图框 ---------- */
.page-about .about-figure {
  margin: clamp(32px, 6vw, 56px) 0 0;
  position: relative;
  isolation: isolate;
}

.page-about .about-figure::before {
  content: "";
  position: absolute;
  inset: 12px -10px -12px 12px;
  background: var(--paper-warm);
  border: 1px solid var(--sand);
  z-index: -1;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: linear-gradient(180deg, #2a3446 0%, #6b5844 58%, #c68b33 100%);
}

.page-about .about-figure--hero img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--network img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--team img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--slate-500);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  margin-top: clamp(56px, 9vw, 108px);
}

.page-about .about-section__head {
  max-width: 36em;
  margin-bottom: clamp(24px, 4vw, 38px);
}

.page-about .about-section__head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.008em;
  color: var(--ink-950);
  margin: 10px 0 0;
  text-wrap: balance;
}

.page-about .about-section__sub {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about .about-section__head .eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--rust);
  text-transform: none;
}

/* ---------- 起点 ---------- */
.page-about .about-lede-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding-top: 8px;
}

.page-about .about-lede-grid p {
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ink-800);
}

.page-about .about-lede-grid p:first-child {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
  color: var(--ink-950);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 26px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-entry__year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-entry--now .about-entry__year {
  color: var(--rust);
}

.page-about .about-entry__content h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.4;
  color: var(--ink-950);
  margin: 0 0 10px;
}

.page-about .about-entry__content p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-800);
}

.page-about .about-note {
  margin: 2px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.75;
  color: var(--slate-500);
}

.page-about .about-entry--now .about-note {
  border-left-color: var(--rust);
  color: var(--rust);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.page-about .about-figure--network {
  margin-top: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--sand);
  border: 1px solid var(--sand);
}

.page-about .about-stat {
  background: var(--paper-warm);
  padding: 16px 14px;
}

.page-about .about-stat dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--slate-500);
  line-height: 1.5;
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--ink-950);
}

.page-about .about-stat .num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
}

.page-about .about-stat__unit {
  font-size: 12px;
  color: var(--slate-500);
}

.page-about .about-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-cities li {
  font-size: 13px;
  line-height: 1;
  padding: 8px 12px;
  color: var(--ink-900);
  background: var(--paper-warm);
  border: 1px solid var(--sand);
  border-left: 3px solid var(--amber);
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-about .about-cities li:hover,
.page-about .about-cities li:focus-visible {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-950);
}

.page-about .about-network__tail {
  margin: clamp(24px, 4vw, 32px) 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-800);
  padding-left: 14px;
  border-left: 2px solid var(--sand);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-about .about-team__main p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-800);
}

.page-about .about-figure--team {
  margin-top: 0;
}

.page-about .about-crew {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-crew__item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 10px;
}

.page-about .about-crew__name {
  font-size: 13px;
  color: var(--ink-900);
}

.page-about .about-crew__bar {
  display: block;
  height: 8px;
  background: var(--paper-warm);
  border: 1px solid var(--sand);
  overflow: hidden;
}

.page-about .about-crew__fill {
  display: block;
  height: 100%;
  background: var(--ink-800);
}

.page-about .about-crew__item--a .about-crew__fill { width: 31%; }
.page-about .about-crew__item--b .about-crew__fill { width: 35%; background: var(--amber); }
.page-about .about-crew__item--c .about-crew__fill { width: 19%; }
.page-about .about-crew__item--d .about-crew__fill { width: 15%; }

.page-about .about-crew__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-950);
  text-align: right;
}

/* ---------- 工作方法 ---------- */
.page-about .about-method__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--sand);
  border: 1px solid var(--sand);
}

.page-about .about-method__item {
  background: var(--paper);
  padding: clamp(18px, 3vw, 26px);
  position: relative;
}

.page-about .about-method__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 3px;
  background: var(--amber);
}

.page-about .about-method__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--slate-500);
  margin-bottom: 10px;
}

.page-about .about-method__item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--ink-950);
  margin: 0 0 8px;
  line-height: 1.4;
}

.page-about .about-method__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-800);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__panel {
  background: var(--ink-900);
  color: var(--paper);
  padding: clamp(24px, 4.5vw, 48px);
  position: relative;
  border: 1px solid var(--ink-800);
}

.page-about .about-next__panel::after {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(24px, 4.5vw, 48px);
  bottom: clamp(24px, 4.5vw, 48px);
  width: 3px;
  background: var(--amber);
}

.page-about .about-next__panel .eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--amber-light);
}

.page-about .about-next__panel h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.24;
  margin: 10px 0 0;
  color: var(--paper);
}

.page-about .about-next__panel > p {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sand);
}

.page-about .about-next__links {
  margin-top: clamp(22px, 3.5vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--ink-800);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "label arrow"
    "desc arrow";
  gap: 4px 14px;
  align-items: center;
  padding: 16px 18px;
  background: var(--ink-900);
  color: var(--paper);
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink-800);
}

.page-about .about-next__label {
  grid-area: label;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber-light);
}

.page-about .about-next__desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--sand);
}

.page-about .about-next__arrow {
  grid-area: arrow;
  font-size: 18px;
  color: var(--amber);
  transition: transform 180ms ease;
}

.page-about .about-next__link:hover .about-next__arrow,
.page-about .about-next__link:focus-visible .about-next__arrow {
  transform: translateX(4px);
}

.page-about .about-next__foot {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--slate-500);
}

.page-about .about-next__foot a {
  color: var(--amber-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 窄屏收尾 ---------- */
@media (max-width: 420px) {
  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-crew__item {
    grid-template-columns: 72px minmax(0, 1fr) 24px;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-lede-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-entry {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 8px 28px;
    padding: 30px 0;
  }

  .page-about .about-entry__year {
    grid-row: span 2;
  }

  .page-about .about-note {
    margin-top: 4px;
  }

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

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

/* ---------- 桌面：侧边年份轨道 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: var(--about-track) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-hero__rail {
    order: 0;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 22px;
    padding-top: 6px;
    position: sticky;
    top: calc(var(--frame-h) + 28px);
  }

  .page-about .about-hero__side {
    display: block;
  }

  .page-about .about-figure--hero {
    margin-top: clamp(36px, 5vw, 60px);
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-entry {
    grid-template-columns: 148px minmax(0, 1fr) 210px;
    align-items: start;
    gap: 0 36px;
  }

  .page-about .about-entry__year {
    grid-row: auto;
  }

  .page-about .about-note {
    margin-top: 4px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__body h1,
  .page-about .about-hero__body .lede,
  .page-about .about-hero__meta {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .page-about .about-next__arrow,
  .page-about .about-cities li {
    transition: none;
  }
}
<<<END>>>