.page-about {
  background: var(--sand);
  color: var(--ink);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .about-intro {
  padding-top: clamp(20px, 4vw, 36px);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(20px, 4vw, 40px);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-intro__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 10px 0 clamp(16px, 3vw, 26px);
  color: var(--indigo);
}

.page-about .about-intro__lead h1 em {
  font-style: normal;
  display: inline-block;
  background: var(--indigo);
  color: var(--sand);
  padding: 0 0.14em;
  box-shadow: 6px 6px 0 rgba(47, 230, 200, 0.55);
}

.page-about .about-lead {
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.8;
  color: var(--indigo);
  max-width: 52ch;
  margin: 0;
}

.page-about .about-meta {
  background: var(--indigo);
  color: var(--sand-light);
  border: var(--border-hard);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .about-meta__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-meta__list {
  margin: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-meta__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--sand-line);
}

.page-about .about-meta__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-meta__row dt {
  font-size: 13px;
  color: var(--sand-dim);
  white-space: nowrap;
}

.page-about .about-meta__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--sand-light);
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 20px);
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .about-head__text {
  display: grid;
  gap: 8px;
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.6vw, 44px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--indigo);
}

.page-about .about-head .eyebrow {
  color: var(--mist);
}

/* ---------- 品牌定位 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-split__text > p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 60ch;
}

.page-about .about-lines {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-lines__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  background: var(--sand-light);
  border: var(--border);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-lines__key {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--cyan);
  border: 2px solid var(--indigo);
  color: var(--indigo);
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-lines__item h3 {
  margin: 0 0 6px;
  font-size: clamp(16px, 2vw, 18px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--indigo);
}

.page-about .about-lines__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

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

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

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(10px, 2vw, 16px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 18px;
  bottom: 26px;
  width: 2px;
  background: var(--indigo-line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 6px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 13px;
  height: 13px;
  background: var(--cyan);
  border: 3px solid var(--indigo);
}

.page-about .about-timeline__year {
  display: block;
  font-size: clamp(28px, 7vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--indigo);
  font-variant-numeric: tabular-nums;
  margin-bottom: 8px;
}

.page-about .about-timeline__details {
  border: var(--border);
  background: var(--sand-light);
  padding: 12px 16px 14px;
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-timeline__details summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding-right: 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

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

.page-about .about-timeline__details summary::after {
  content: "";
  position: absolute;
  right: 4px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 3px solid var(--indigo);
  border-bottom: 3px solid var(--indigo);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 220ms var(--ease);
}

.page-about .about-timeline__details[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

.page-about .about-timeline__title {
  font-size: clamp(16px, 2.1vw, 19px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--indigo);
}

.page-about .about-timeline__hint {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-timeline__body {
  padding-top: 10px;
  border-top: 1px dashed var(--indigo-line);
  margin-top: 10px;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .about-timeline__figure {
  list-style: none;
  margin: 8px 0 8px 32px;
}

.page-about .about-timeline__figure .media-frame {
  margin: 0;
}

.page-about .about-timeline__note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  padding-left: 14px;
  border-left: 4px solid var(--amber);
}

.page-about .about-timeline__note a {
  color: var(--indigo);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  background: var(--indigo);
  color: var(--sand-light);
  border-top: 3px solid var(--indigo);
  border-bottom: 3px solid var(--indigo);
  padding-block: clamp(36px, 6vw, 64px);
}

.page-about .about-head--band h2 {
  color: var(--sand-light);
}

.page-about .about-head--band .eyebrow {
  color: var(--cyan);
}

.page-about .num-badge--band {
  background: var(--cyan);
  color: var(--indigo);
  border-color: var(--cyan);
}

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

.page-about .about-stats__item {
  background: var(--indigo);
  padding: clamp(16px, 3vw, 24px);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-stats__num {
  display: block;
  font-size: clamp(28px, 5.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.page-about .about-stats__unit {
  font-size: 0.5em;
  margin-left: 3px;
  color: var(--sand-light);
}

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

.page-about .about-band__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--sand-dim);
  max-width: 66ch;
  border-left: 4px solid var(--amber);
  padding-left: 14px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .about-roles .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--indigo);
}

.page-about .about-roles .tab {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 9px 13px;
  border: 2px solid var(--indigo);
  border-radius: 0;
  background: var(--sand-light);
  color: var(--indigo);
  cursor: pointer;
  transition: background-color 180ms var(--ease), color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-roles .tab:hover {
  background: var(--sand);
}

.page-about .about-roles .tab[aria-selected="true"] {
  background: var(--indigo);
  color: var(--cyan);
  box-shadow: 4px 4px 0 var(--amber);
}

.page-about .about-roles .tab:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 2px;
}

.page-about .about-roles__panel {
  margin-top: 16px;
  padding: clamp(16px, 3vw, 24px);
  background: var(--sand-light);
  border: var(--border);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-roles__panel h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--indigo);
}

.page-about .about-roles__panel p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 60ch;
}

.page-about .about-roles__meta {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--indigo-line);
}

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

/* ---------- 内容生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .about-eco__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 62ch;
}

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

.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 16px;
  background: var(--sand-light);
  border-left: 6px solid var(--azure);
  border-top: var(--border);
  border-right: var(--border);
  border-bottom: var(--border);
}

.page-about .about-rhythm__item:nth-child(2) {
  border-left-color: var(--violet);
}

.page-about .about-rhythm__item:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .about-rhythm__key {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--sand-light);
  background: var(--indigo);
  border: 2px solid var(--indigo);
}

.page-about .about-rhythm__item h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--indigo);
}

.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 运营主体 ---------- */
.page-about .about-entity__panel {
  background: var(--sand-light);
  border: var(--border-hard);
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 4vw, 40px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.5vw, 36px);
}

.page-about .about-entity__main h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 12px 0 16px;
  color: var(--indigo);
}

.page-about .about-entity__main p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 56ch;
}

.page-about .about-entity__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-entity__facts {
  margin: 0;
  display: grid;
  gap: 0;
  align-content: start;
  border-top: 3px solid var(--indigo);
}

.page-about .about-entity__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--indigo-line);
}

.page-about .about-entity__row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-entity__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--indigo);
  overflow-wrap: anywhere;
}

.page-about .about-entity__row dd.mono {
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 128px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 30px);
    align-items: start;
    padding-left: 34px;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
    text-align: left;
  }

  .page-about .about-timeline__figure {
    margin-left: 34px;
  }

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

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .about-entity__panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-figure {
    position: sticky;
    top: 24px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .about-lines__item,
  .page-about .about-rhythm__item {
    grid-template-columns: 1fr;
  }

  .page-about .about-rhythm__key {
    width: 100%;
    height: 36px;
    font-size: 15px;
  }

  .page-about .about-entity__panel {
    padding: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__details summary::after,
  .page-about .about-roles .tab {
    transition: none;
  }
}
<<<END>>>