.page-about {
  --about-tl-gutter: 58px;
  --about-tl-line-x: 29px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-hero__crumbs {
  margin-bottom: clamp(20px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(16px, 2.4vw, 24px) 0 clamp(36px, 5vw, 64px);
  background: var(--ink);
  color: var(--text-ink);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -6%;
  top: -18%;
  width: 54%;
  height: 138%;
  background: var(--paper);
  transform: skewX(-12deg);
  transform-origin: top right;
  opacity: 0.045;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 8%;
  bottom: -28%;
  width: 24%;
  height: 76%;
  background: var(--signal);
  opacity: 0.07;
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--text-ink);
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 36em;
  margin: 0 0 clamp(20px, 2.6vw, 28px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  align-items: center;
  margin-bottom: clamp(28px, 4vw, 40px);
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-ink-strong);
}

.page-about .about-hero__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

.page-about .about-hero__facts {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2.2vw, 24px);
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line-ink);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__fact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-ink);
}

/* ---------- 01 · 服务角色 ---------- */
.page-about .about-role {
  background: var(--ink);
  color: var(--text-ink);
  padding: clamp(44px, 6vw, 80px) 0 clamp(48px, 6vw, 88px);
  border-top: 1px solid var(--line-ink);
}

.page-about .about-role__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-role__main {
  max-width: 42em;
}

.page-about .about-role__main .section__title {
  color: var(--text-ink);
  margin: 0 0 clamp(16px, 2vw, 22px);
}

.page-about .about-role__lede {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.78;
  color: var(--text-dim);
  margin: 0 0 16px;
}

.page-about .about-role__main > p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-role__aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-role__note {
  background: var(--ink-2);
  padding: 20px 22px;
  border-left: 2px solid var(--signal);
}

.page-about .about-role__note-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .about-role__note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-role__impact {
  display: grid;
  gap: 1px;
  background: var(--line-ink);
}

.page-about .impact-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 18px;
  background: var(--ink-2);
}

.page-about .impact-row__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--signal);
  flex-shrink: 0;
  min-width: 2ch;
}

.page-about .impact-row__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-dim);
}

/* ---------- 02 · 时间线 ---------- */
.page-about .about-timeline {
  background: var(--paper);
  color: var(--brown);
  padding: clamp(44px, 6vw, 80px) 0;
}

.page-about .about-timeline .eyebrow {
  color: var(--terracotta);
}

.page-about .about-timeline .section__title {
  color: var(--brown);
}

.page-about .about-timeline .lede {
  color: rgba(36, 27, 22, 0.7);
}

.page-about .about-timeline__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-timeline__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: var(--about-tl-line-x);
  top: 38px;
  bottom: 30px;
  width: 1px;
  background: var(--line-paper);
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: var(--about-tl-gutter) 1fr;
  gap: clamp(14px, 2.2vw, 24px);
  padding-bottom: clamp(28px, 4vw, 44px);
  position: relative;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item__marker {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
}

.page-about .tl-item__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  white-space: nowrap;
  background: var(--paper-warm);
  border: 1px solid rgba(36, 27, 22, 0.28);
  color: var(--brown);
}

.page-about .tl-item--teal .tl-item__num {
  border-color: var(--teal);
  color: var(--teal);
}

.page-about .tl-item--signal .tl-item__num {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  font-weight: 700;
}

.page-about .tl-item__body {
  padding-top: 2px;
}

.page-about .tl-item__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .tl-item__kicker--teal {
  color: var(--teal);
}

.page-about .tl-item__kicker--signal {
  color: var(--terracotta);
}

.page-about .tl-item__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 0 0 10px;
  color: var(--brown);
}

.page-about .tl-item__body p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(36, 27, 22, 0.78);
  max-width: 38em;
}

.page-about .about-timeline__aside {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 28px);
}

.page-about .about-timeline__media {
  margin: 0;
  padding: 10px;
  background: var(--paper-warm);
  border: 1px solid var(--line-paper);
}

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

.page-about .about-timeline__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--terracotta);
}

.page-about .about-timeline__note {
  padding: 18px 20px;
  border-left: 2px solid var(--teal);
  background: rgba(22, 122, 106, 0.06);
}

.page-about .about-timeline__note-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.page-about .about-timeline__note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(36, 27, 22, 0.78);
}

/* ---------- 03 · 团队 ---------- */
.page-about .about-team {
  background: var(--ink);
  color: var(--text-ink);
  padding: clamp(44px, 6vw, 80px) 0;
}

.page-about .about-team__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-team__head .section__title {
  color: var(--text-ink);
}

.page-about .about-team__head .lede {
  color: var(--text-dim);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .team-card {
  background: var(--ink-2);
  border-top: 1px solid var(--line-ink-strong);
  padding: clamp(20px, 2.6vw, 28px);
  display: flex;
  flex-direction: column;
}

.page-about .team-card--edit {
  border-top-color: var(--teal);
}

.page-about .team-card--test {
  border-top-color: var(--teal-soft);
}

.page-about .team-card--serve {
  border-top-color: var(--signal);
}

.page-about .team-card__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--teal-soft);
}

.page-about .team-card__kicker--signal {
  color: var(--signal);
}

.page-about .team-card__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 1.8vw, 24px);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--text-ink);
}

.page-about .team-card__desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .team-card__details {
  margin-top: auto;
  border-top: 1px solid var(--line-ink);
  padding-top: 12px;
}

.page-about .team-card__summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal-soft);
  padding: 4px 0;
  list-style: none;
}

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

.page-about .team-card__summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
}

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

.page-about .team-card__list {
  margin: 12px 0 4px;
  padding: 0;
  list-style: none;
}

.page-about .team-card__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 1px;
  background: var(--teal-soft);
}

.page-about .about-team__media {
  margin: 0;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-ink-strong);
}

.page-about .about-team__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

/* ---------- 04 · 更新节奏 ---------- */
.page-about .about-cadence {
  background: var(--paper);
  color: var(--brown);
  padding: clamp(44px, 6vw, 80px) 0;
}

.page-about .about-cadence .eyebrow {
  color: var(--terracotta);
}

.page-about .about-cadence .section__title {
  color: var(--brown);
}

.page-about .about-cadence .lede {
  color: rgba(36, 27, 22, 0.7);
}

.page-about .about-cadence__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-cadence__tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line-paper);
  margin-bottom: clamp(24px, 3vw, 32px);
}

.page-about .about-cadence__tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 12px 20px 14px;
  margin-bottom: -1px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: rgba(36, 27, 22, 0.55);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-cadence__tab[aria-selected="true"] {
  color: var(--brown);
  border-bottom-color: var(--signal);
  font-weight: 700;
}

.page-about .about-cadence__tab:focus-visible {
  outline: 2px solid var(--terracotta);
  outline-offset: 2px;
}

.page-about .about-cadence__panel {
  border: 1px solid var(--line-paper);
  background: var(--paper-warm);
  padding: clamp(22px, 3.2vw, 36px);
}

.page-about .about-cadence__panel[hidden] {
  display: none;
}

.page-about .about-cadence__panel-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
  align-items: start;
}

.page-about .about-cadence__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-cadence__kicker--signal {
  color: var(--terracotta);
}

.page-about .about-cadence__panel-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.28;
  margin: 0 0 12px;
  color: var(--brown);
}

.page-about .about-cadence__copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(36, 27, 22, 0.8);
}

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

.page-about .about-cadence__meta {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-paper);
  border: 1px solid var(--line-paper);
}

.page-about .about-cadence__meta > div {
  background: var(--paper);
  padding: 12px 16px;
}

.page-about .about-cadence__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--terracotta);
  margin-bottom: 4px;
}

.page-about .about-cadence__meta dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--brown);
}

/* ---------- 05 · 合作生态 ---------- */
.page-about .about-eco {
  background: var(--ink);
  color: var(--text-ink);
  padding: clamp(44px, 6vw, 80px) 0;
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-eco__copy .section__title {
  color: var(--text-ink);
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .about-eco__copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 40em;
}

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

.page-about .about-eco__stats {
  display: grid;
  gap: 1px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink-strong);
}

.page-about .eco-stat {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 16px;
  padding: 18px 20px;
  background: var(--ink-2);
}

.page-about .eco-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 700;
  color: var(--signal);
  letter-spacing: -0.01em;
  min-width: 2.5ch;
}

.page-about .eco-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  background: var(--ink);
  padding: 0 0 clamp(48px, 6vw, 80px);
}

.page-about .about-cta__panel {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line-ink-strong);
  padding: clamp(26px, 4vw, 48px);
  overflow: hidden;
}

.page-about .about-cta__panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--signal);
}

.page-about .about-cta__eyebrow {
  color: var(--signal);
  position: relative;
  z-index: 1;
}

.page-about .about-cta__title {
  position: relative;
  z-index: 1;
  color: var(--text-ink);
  margin: 0 0 14px;
}

.page-about .about-cta__lede {
  position: relative;
  z-index: 1;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 38em;
}

.page-about .about-cta__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  align-items: center;
}

.page-about .about-cta__link {
  color: var(--text-ink);
}

.page-about .about-cta__link:hover {
  color: var(--signal);
}

/* ---------- 入场动效（渐进增强） ---------- */
.js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.js .page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .page-about {
    --about-tl-gutter: 48px;
    --about-tl-line-x: 24px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-cadence__tablist {
    gap: 0;
  }

  .page-about .about-cadence__tab {
    flex: 1 1 auto;
    text-align: center;
    padding: 10px 12px 12px;
    font-size: 13px;
  }

  .page-about .eco-stat {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

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

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

  .page-about .about-team__media {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-cadence__panel-inner {
    grid-template-columns: 7fr 3fr;
  }
}

@media (min-width: 900px) {
  .page-about .about-role__grid {
    grid-template-columns: 7fr 4fr;
    gap: clamp(32px, 5vw, 72px);
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__layout {
    grid-template-columns: 7fr 4fr;
    align-items: start;
  }

  .page-about .about-timeline__aside {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-team__media {
    grid-column: 1 / -1;
  }

  .page-about .about-eco__grid {
    grid-template-columns: 7fr 4fr;
  }
}

@media (min-width: 1100px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, 1fr) 2fr;
  }

  .page-about .about-team__media {
    grid-column: auto;
    align-self: stretch;
  }

  .page-about .about-team__media img {
    height: 100%;
    object-fit: cover;
  }
}

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