.page-about {
  background: var(--cream);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 6vw, 60px);
  border-bottom: 2px solid var(--ink);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line) 0 1px,
    transparent 1px 120px
  );
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero__inner .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--brick);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 8.2vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
  max-width: 18em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: clamp(56px, 18vw, 120px);
  height: 8px;
  margin-top: 22px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-hero__facts {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--charcoal);
  color: var(--cream);
}

.page-about .about-fact__value {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(26px, 6.4vw, 42px);
  line-height: 1;
  color: var(--orange);
  letter-spacing: -.03em;
}

.page-about .about-fact__unit {
  font-size: .5em;
  font-weight: 700;
  margin-left: 2px;
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--cream);
  opacity: .82;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 5vw, 48px);
  padding-block: clamp(28px, 5vw, 56px) clamp(40px, 7vw, 80px);
}

.page-about .about-side {
  border-top: 2px solid var(--ink);
  padding-top: 14px;
}

.page-about .about-side__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--slate);
}

.page-about .about-side__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-side__item {
  flex: 0 1 auto;
}

.page-about .about-side__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-side__num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-side__link:hover,
.page-about .about-side__link:focus-visible {
  background: var(--ink);
  color: var(--cream);
  border-color: var(--ink);
}

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

/* ---------- 正文区块 ---------- */
.page-about .about-block {
  padding-block: clamp(26px, 4.5vw, 46px);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-body > .about-block:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-block__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--brick);
  text-transform: uppercase;
}

.page-about .about-block__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -.01em;
  max-width: 20em;
}

.page-about .about-block__title::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 10px;
  background: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  vertical-align: baseline;
}

.page-about .about-block__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

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

.page-about .about-block__text--single {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .about-block__text a,
.page-about .promise-item a {
  color: var(--brick);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-block__text a:hover,
.page-about .promise-item a:hover {
  color: var(--orange);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3.5vw, 32px) 0 0;
  border: 1px solid var(--line-strong);
  background: var(--paper);
}

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

.page-about .about-figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate);
  border-top: 1px solid var(--line);
}

/* ---------- 图例式浏览方式 ---------- */
.page-about .legend {
  display: grid;
  gap: 14px;
}

.page-about .legend__item {
  display: grid;
  grid-template-columns: 6px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  transition: transform .18s var(--ease), background .18s var(--ease);
}

.page-about .legend__item:hover {
  transform: translateY(-2px);
  background: #fffdf8;
}

.page-about .legend__line {
  display: block;
  width: 6px;
  align-self: stretch;
  background: var(--gold);
}

.page-about .legend__line--index {
  background: var(--gold);
}

.page-about .legend__line--schedule {
  background: var(--orange);
}

.page-about .legend__line--data {
  background: var(--green);
}

.page-about .legend__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .legend__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  opacity: .86;
}

/* ---------- 里程碑 ---------- */
.page-about .about-block__split {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}

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

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 16px 16px 16px 20px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--gold);
  transition: transform .18s var(--ease), border-left-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .timeline__item:hover {
  transform: translateY(-2px);
  border-left-color: var(--orange);
  box-shadow: var(--shadow);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 22px;
  width: 12px;
  height: 12px;
  background: var(--orange);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--brick);
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  opacity: .86;
}

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

/* ---------- 团队 ---------- */
.page-about .team-split {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  padding: 20px 18px 22px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .team-card--dark {
  background: var(--green);
  border-color: var(--green);
  color: var(--cream);
}

.page-about .team-card__num {
  display: block;
  margin: 14px 0 10px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 52px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .team-card__unit {
  font-size: .42em;
  font-weight: 700;
  margin-left: 4px;
  color: inherit;
}

.page-about .team-card--dark .team-card__num {
  color: var(--lime);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  max-width: 46ch;
}

.page-about .team-card--dark p {
  color: var(--cream);
  opacity: .88;
}

.page-about .team-card--dark a {
  color: var(--lime);
}

.page-about .about-figure--team {
  margin-top: 18px;
}

/* ---------- 规模数字 ---------- */
.page-about .scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .scale-card {
  padding: 16px 14px 18px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .scale-card--accent {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--paper);
}

.page-about .scale-card--dark {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}

.page-about .scale-card__value {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(28px, 7vw, 46px);
  line-height: 1;
  letter-spacing: -.04em;
}

.page-about .scale-card__unit {
  font-size: .44em;
  font-weight: 700;
  margin-left: 3px;
}

.page-about .scale-card--dark .scale-card__value {
  color: var(--lime);
}

.page-about .scale-card__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  opacity: .8;
}

.page-about .scale-card p {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  opacity: .9;
}

.page-about .scale-note {
  margin: 18px 0 0;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
  background: transparent;
  border-left: 4px solid var(--gold);
  max-width: 66ch;
}

/* ---------- 专题 ---------- */
.page-about .topic-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
}

.page-about .topic-list__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 12px;
  background: var(--paper);
  font-size: 15px;
  line-height: 1.5;
}

.page-about .topic-list__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  color: var(--gold);
}

/* ---------- 承诺 ---------- */
.page-about .promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .promise-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .promise-item__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 16px;
  color: var(--slate);
  padding-top: 2px;
}

.page-about .promise-item__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .promise-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  opacity: .86;
  max-width: 60ch;
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 5vw, 48px);
  background: var(--green);
  color: var(--cream);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-cta__inner {
  padding: clamp(24px, 5vw, 44px) clamp(18px, 4vw, 40px);
}

.page-about .about-cta__title {
  margin: 14px 0 12px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  max-width: 52ch;
  color: var(--cream);
  opacity: .88;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

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

  .page-about .scale-grid,
  .page-about .topic-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .promise-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .legend {
    gap: 16px;
  }

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

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

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

  .page-about .timeline__item {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }

  .page-about .timeline__year {
    font-size: 30px;
    padding-top: 2px;
  }
}

/* ---------- 桌面：侧边索引 + 错落时间块 ---------- */
@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-side {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-top: 18px;
  }

  .page-about .about-side__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-side__item {
    width: 100%;
  }

  .page-about .about-side__link {
    display: flex;
    width: 100%;
    padding: 8px 10px;
    border: none;
    border-left: 3px solid var(--line-strong);
    background: transparent;
    font-size: 14px;
  }

  .page-about .about-side__link:hover,
  .page-about .about-side__link:focus-visible {
    background: var(--paper);
    color: var(--ink);
    border-left-color: var(--orange);
  }

  .page-about .about-block__split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }

  .page-about .timeline__item:nth-child(odd) {
    margin-right: 28px;
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: 28px;
    border-left-color: var(--orange);
  }

  .page-about .about-figure--timeline {
    position: sticky;
    top: 96px;
  }

  .page-about .promise-item {
    grid-template-columns: 56px minmax(0, 1fr);
    padding: 22px 0;
  }

  .page-about .about-cta__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    column-gap: 40px;
  }

  .page-about .about-cta__inner .tag {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .page-about .about-cta__title,
  .page-about .about-cta__text {
    grid-column: 1;
  }

  .page-about .about-cta__actions {
    grid-column: 2;
    grid-row: 2 / span 2;
    margin-top: 0;
    justify-content: flex-end;
  }
}
<<<END>>>