.page-about {
  --about-pad: clamp(20px, 4vw, 36px);
  --about-gap: clamp(18px, 3vw, 28px);
  background-color: var(--paper-50);
  background-image:
    repeating-linear-gradient(45deg, rgba(30, 58, 110, 0.045) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(-45deg, rgba(201, 162, 39, 0.06) 0 1px, transparent 1px 24px);
  padding-bottom: clamp(32px, 6vw, 64px);
}

.page-about .shell {
  padding-top: clamp(14px, 2.5vw, 24px);
}

/* 面包屑 */
.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--graphite-600);
}

.page-about .crumbs__link {
  color: var(--indigo-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .crumbs__link:hover,
.page-about .crumbs__link:focus-visible {
  border-bottom-color: var(--gold-500);
}

.page-about .crumbs__sep {
  color: var(--stone-300);
}

/* 首屏档案面板 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border: var(--edge);
  box-shadow: var(--hard-shadow);
  background: linear-gradient(158deg, var(--indigo-500) 0%, var(--indigo-900) 64%);
  color: var(--paper);
  padding: var(--about-pad);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 70%;
  height: 150%;
  background: radial-gradient(circle at 50% 50%, rgba(214, 72, 90, 0.4), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(125deg, rgba(255, 255, 255, 0.055) 0 1px, transparent 1px 18px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: var(--label);
  text-transform: uppercase;
  color: var(--gold-100);
}

.page-about .about-hero__title {
  margin: 14px 0 16px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.84);
}

.page-about .about-hero__coords {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 2px solid rgba(201, 162, 39, 0.55);
}

.page-about .coord {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .coord__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-100);
}

.page-about .coord__label {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.68);
}

/* 堆叠面板 */
.page-about .about-stack {
  display: grid;
  gap: var(--about-gap);
  margin-top: var(--about-gap);
}

.page-about .about-panel {
  border: var(--edge);
  box-shadow: var(--hard-shadow);
  background: var(--paper);
  padding: var(--about-pad);
}

.page-about .about-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding-bottom: 14px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--indigo-900);
}

.page-about .about-panel__index {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  background: var(--indigo-900);
  color: var(--gold-500);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-panel__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--indigo-900);
}

.page-about .about-panel__note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--graphite-600);
}

.page-about .about-panel__foot {
  margin: 20px 0 0;
  padding: 14px 16px;
  background: var(--gold-100);
  border-left: 6px solid var(--gold-500);
  font-size: 13px;
  line-height: 1.8;
  color: var(--indigo-900);
}

/* 团队四宫格 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--paper-50);
  border: var(--edge-soft);
  box-shadow: 4px 4px 0 var(--stone-300);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-color: var(--indigo-700);
  box-shadow: 9px 9px 0 var(--gold-500);
  outline: none;
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 9vw, 56px);
  font-weight: 700;
  line-height: 1;
  color: var(--indigo-700);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card__label {
  font-size: 12px;
  letter-spacing: var(--label);
  text-transform: uppercase;
  color: var(--red-600);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite-600);
}

/* 数据来源 */
.page-about .sources-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
}

.page-about .sources-figure {
  margin: 0;
}

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

.page-about .sources-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .source-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  background: var(--paper-50);
  border-left: 6px solid var(--indigo-100);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .source-row:hover,
.page-about .source-row:focus-visible {
  border-left-color: var(--gold-500);
  background: var(--indigo-100);
  outline: none;
}

.page-about .source-row__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--indigo-700);
  padding-top: 2px;
}

.page-about .source-row__body {
  min-width: 0;
}

.page-about .source-row__name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--indigo-900);
}

.page-about .source-row__text {
  margin: 0 0 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--graphite-600);
}

.page-about .source-row__state {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--teal-600);
}

.page-about .source-row__state::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal-600);
}

/* 时间轴 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 28px);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 12px;
  left: 5px;
  width: 2px;
  background: var(--indigo-700);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 16px;
  left: -31px;
  width: 10px;
  height: 10px;
  background: var(--gold-500);
  border: 2px solid var(--indigo-900);
}

.page-about .tl {
  border: var(--edge-soft);
  background: var(--paper-50);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .tl[open] {
  border-color: var(--indigo-700);
  box-shadow: 4px 4px 0 var(--indigo-100);
}

.page-about .tl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  color: var(--graphite-600);
}

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

.page-about .tl__summary::after {
  content: "▸";
  margin-left: auto;
  font-size: 14px;
  color: var(--graphite-600);
  transition: transform 0.2s ease, color 0.2s ease;
}

.page-about .tl[open] .tl__summary::after {
  transform: rotate(90deg);
  color: var(--indigo-700);
}

.page-about .tl__summary:hover,
.page-about .tl__summary:focus-visible {
  outline: none;
  color: var(--indigo-700);
}

.page-about .tl__num {
  display: inline-flex;
  padding: 2px 7px;
  background: var(--indigo-900);
  color: var(--gold-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--red-600);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--indigo-900);
}

.page-about .tl__body {
  padding: 0 14px 14px;
  border-top: 1px dashed var(--stone-300);
}

.page-about .tl__body p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--graphite-600);
}

.page-about .timeline-figure {
  margin: 0;
  align-self: start;
}

/* 使用者三列 */
.page-about .users-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .user-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  background: var(--paper);
  border: var(--edge);
  box-shadow: 4px 4px 0 var(--stone-300);
}

.page-about .user-card::before {
  content: "";
  width: 52px;
  height: 6px;
  background: var(--indigo-700);
}

.page-about .user-card--media::before {
  background: var(--red-600);
}

.page-about .user-card--ops::before {
  background: var(--gold-500);
}

.page-about .user-card__title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--indigo-900);
}

.page-about .user-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--graphite-600);
}

/* 合作面板 */
.page-about .about-collab {
  position: relative;
  overflow: hidden;
  padding: var(--about-pad);
  border: var(--edge);
  box-shadow: var(--hard-shadow);
  background: linear-gradient(150deg, var(--indigo-700) 0%, var(--indigo-900) 72%);
  color: var(--paper);
}

.page-about .about-collab::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(60deg, rgba(201, 162, 39, 0.14) 0 1px, transparent 1px 20px);
  pointer-events: none;
}

.page-about .about-collab__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 30px);
  align-items: start;
}

.page-about .about-collab__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: var(--label);
  text-transform: uppercase;
  color: var(--gold-100);
}

.page-about .about-collab__title {
  margin: 12px 0 14px;
  font-family: var(--font-head);
  font-size: clamp(24px, 4.4vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .about-collab__lead {
  margin: 0 0 18px;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-collab__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px 20px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-collab__list li {
  padding: 8px 0 8px 14px;
  border-left: 2px solid rgba(201, 162, 39, 0.5);
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.86);
}

.page-about .about-collab__list .data-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--gold-100);
  font-variant-numeric: tabular-nums;
}

.page-about .about-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border: 2px solid var(--gold-500);
  box-shadow: 4px 4px 0 rgba(201, 162, 39, 0.35);
  color: var(--gold-100);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-cta::after {
  content: "→";
  font-family: var(--font-mono);
}

.page-about .about-cta:hover,
.page-about .about-cta:focus-visible {
  background: var(--gold-500);
  color: var(--indigo-900);
  box-shadow: 7px 7px 0 rgba(201, 162, 39, 0.28);
  outline: none;
}

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

/* 下一步 */
.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  background: var(--paper);
  border: var(--edge);
  box-shadow: var(--hard-shadow);
}

.page-about .about-next__text {
  flex: 1 1 320px;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite-600);
}

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

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

@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-hero__coords {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding-top: 0;
    padding-left: 20px;
    border-top: 0;
    border-left: 2px solid rgba(201, 162, 39, 0.55);
  }

  .page-about .coord {
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
  }

  .page-about .coord__num {
    font-size: 30px;
    min-width: 78px;
  }

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

  .page-about .about-collab__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .sources-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .users-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
<<<END>>>