.page-about {
  --about-rule: rgba(18, 59, 50, .16);
  --about-card-gap: 16px;
}

.page-about .about-crumb {
  padding-block: 22px 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 28px 8px;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
}

.page-about .about-hero__eyebrow {
  color: var(--clay);
  letter-spacing: .16em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(28px, 8vw, 54px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink-green);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  align-self: start;
}

.page-about .about-hero__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  display: block;
  margin-bottom: 26px;
}

.page-about .about-head__title {
  margin: 6px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(24px, 5.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -.005em;
  color: var(--ink-green);
}

.page-about .about-head__note {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist-gray);
}

.page-about .about-head--night .about-head__title,
.page-about .about-head--night .section-head__index {
  color: var(--paper);
}

.page-about .about-head--night .about-head__note {
  color: var(--ink-invert);
}

/* ---------- 01 为什么 ---------- */
.page-about .about-why__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-why__aside {
  padding: 22px 20px;
  background: var(--panel);
  border-top: 3px solid var(--ink-green);
}

.page-about .about-aside__label {
  color: var(--mist-gray);
  letter-spacing: .16em;
}

.page-about .about-rhythm {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  background: var(--panel);
}

.page-about .about-rhythm__time {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--orange-deep);
}

.page-about .about-rhythm__text {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink);
}

/* ---------- 02 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__lead {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-acc__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  width: 100%;
  padding: 15px 2px;
  text-align: left;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--about-rule);
  cursor: pointer;
  color: var(--ink-green);
  transition: color var(--t-fast);
}

.page-about .about-accordion .about-acc:last-child .about-acc__trigger {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-acc__trigger:hover,
.page-about .about-acc__trigger:focus-visible {
  color: var(--orange-deep);
}

.page-about .about-acc__name {
  font-family: var(--font-sans);
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.45;
}

.page-about .about-acc__hint {
  color: var(--fog);
  letter-spacing: .08em;
  white-space: nowrap;
}

.page-about .about-acc__panel p {
  margin: 0;
  padding: 4px 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-gray);
}

/* ---------- 03 时间线 ---------- */
.page-about .about-timeline__list {
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-node {
  flex: 0 0 auto;
  display: grid;
  gap: 3px;
  min-width: 132px;
  padding: 14px 16px 16px 0;
  margin-right: 22px;
  text-align: left;
  background: transparent;
  border: 0;
  border-top: 3px solid var(--line-strong);
  cursor: pointer;
  color: var(--mist-gray);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .tabs__tab.about-node[aria-selected="true"] {
  border-top-color: var(--orange);
  color: var(--ink-green);
}

.page-about .about-node__year {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--clay);
}

.page-about .about-node__ver {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 22px;
  line-height: 1;
  color: inherit;
}

.page-about .about-node__name {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist-gray);
}

.page-about .tabs__tab.about-node[aria-selected="true"] .about-node__name {
  color: var(--ink);
}

.page-about .about-timeline__panel {
  margin-top: 24px;
  padding: 24px 20px;
  background: var(--panel);
  border-left: 3px solid var(--orange);
}

.page-about .about-timeline__tag {
  margin: 0;
  color: var(--clay);
  letter-spacing: .14em;
}

.page-about .about-timeline__title {
  margin: 8px 0 12px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(19px, 4.4vw, 24px);
  line-height: 1.35;
  color: var(--ink-green);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 04 五类索引 ---------- */
.page-about .about-index__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-index-list > li {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--paper);
}

.page-about .about-index-list__num {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--fog);
}

.page-about .about-index-list h3 {
  margin: 6px 0 8px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.3;
  color: var(--ink-green);
}

.page-about .about-index-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist-gray);
}

.page-about .about-index__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-index__flow {
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-flow-step {
  padding: 20px 18px;
  background: var(--panel);
}

.page-about .about-flow-step__badge {
  display: inline-block;
  padding: 3px 8px;
  background: var(--ink-green);
  color: var(--paper);
  letter-spacing: .14em;
}

.page-about .about-flow-step h3 {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  color: var(--ink-green);
}

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

/* ---------- 05 使用形态 ---------- */
.page-about .about-modes__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line-invert);
}

.page-about .about-modes__tab {
  flex: 0 1 auto;
  padding: 12px 16px;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 14.5px;
  letter-spacing: .04em;
  color: var(--ink-invert);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .tabs__tab.about-modes__tab[aria-selected="true"] {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

.page-about .about-modes__panel {
  margin-top: 26px;
  padding: 24px 20px;
  background: rgba(244, 240, 230, .06);
  border: 1px solid var(--line-invert);
}

.page-about .about-modes__title {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(19px, 4.4vw, 25px);
  line-height: 1.32;
  color: var(--paper);
}

.page-about .about-modes__panel > p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-invert);
}

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

.page-about .about-modes__list-items li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .about-modes__list-items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 06 合作 ---------- */
.page-about .about-partner__grid {
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-partner__col {
  padding: 24px 20px 26px;
  background: var(--paper);
}

.page-about .about-partner__mark {
  display: block;
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .about-partner__col h3 {
  margin: 12px 0 10px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink-green);
}

.page-about .about-partner__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-gray);
}

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

/* ---------- 07 规模与去向 ---------- */
.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-scale__item {
  padding: 18px 16px 20px;
  background: var(--paper);
}

.page-about .about-scale__item dt {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist-gray);
}

.page-about .about-scale__item dd {
  margin: 8px 0 0;
  font-size: clamp(24px, 6vw, 34px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-green);
}

.page-about .about-scale__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-gray);
}

.page-about .about-next {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 3px solid var(--ink-green);
}

.page-about .about-next__title {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 20px;
  color: var(--ink-green);
}

.page-about .about-next__links {
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-next__link {
  display: grid;
  gap: 5px;
  padding: 16px 18px;
  background: var(--paper);
  text-decoration: none;
  transition: background var(--t-fast);
}

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

.page-about .about-next__link-label {
  color: var(--clay);
  letter-spacing: .14em;
}

.page-about .about-next__link-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-partner__col:last-child {
    grid-column: 1 / -1;
  }

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

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

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-block: 48px 12px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__lede {
    font-size: 17px;
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-why__aside {
    padding: 26px 24px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-timeline__list {
    overflow-x: visible;
  }

  .page-about .about-node {
    flex: 1 1 0;
    min-width: 0;
    margin-right: 0;
    padding-right: 20px;
  }

  .page-about .about-timeline__panel {
    display: grid;
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    column-gap: 40px;
    row-gap: 0;
    padding: 32px 32px 34px;
  }

  .page-about .about-timeline__tag {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-timeline__title {
    grid-column: 1;
    grid-row: 2;
    margin-bottom: 0;
    font-size: 24px;
  }

  .page-about .about-timeline__text {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: start;
  }

  .page-about .about-index__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 28px 40px;
    align-items: start;
  }

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

  .page-about .about-index__figure {
    grid-column: 2;
    grid-row: 1;
  }

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

  .page-about .about-flow-step {
    padding: 26px 28px;
  }

  .page-about .about-modes__list {
    gap: 8px;
  }

  .page-about .about-modes__tab {
    padding: 14px 26px;
  }

  .page-about .about-modes__panel {
    padding: 36px 40px;
  }

  .page-about .about-modes__panel > p {
    max-width: 62ch;
  }

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

  .page-about .about-partner__col:last-child {
    grid-column: auto;
  }

  .page-about .about-partner__col {
    padding: 30px 28px 32px;
  }

  .page-about .about-scale__stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-acc__trigger,
  .page-about .about-node,
  .page-about .about-modes__tab,
  .page-about .about-next__link {
    transition: none;
  }
}
<<<END>>>