.page-about {
  --about-hero-line: var(--rule-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding: 24px 0 36px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-hero__lead h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-hero__intro + .about-hero__intro {
  margin-top: 12px;
  color: rgba(36, 31, 27, 0.78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  margin: 0;
}

.page-about .about-hero__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero__orbit {
  position: absolute;
  right: 0;
  bottom: -18px;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  background: conic-gradient(
    var(--spring) 0 25%,
    var(--blue) 25% 50%,
    var(--clay) 50% 75%,
    var(--mist) 75% 100%
  );
  -webkit-mask: radial-gradient(circle, transparent 0 50%, #000 51%);
  mask: radial-gradient(circle, transparent 0 50%, #000 51%);
  opacity: 0.85;
  pointer-events: none;
}

/* ---------- 年份索引条 ---------- */
.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(36, 31, 27, 0.55);
}

.page-about .about-index__list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-block;
  margin-right: -1px;
  padding: 6px 13px;
  border: 1px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: var(--ink);
  color: var(--cream);
  outline: none;
}

/* ---------- 三类访客 ---------- */
.page-about .about-who__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-who__card {
  border-top-width: 3px;
  border-top-style: solid;
}

.page-about .about-who__card--spring { border-top-color: var(--spring); }
.page-about .about-who__card--blue { border-top-color: var(--blue); }
.page-about .about-who__card--clay { border-top-color: var(--clay); }

.page-about .about-who__card .panel__title {
  margin: 6px 0 8px;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-who__card .panel__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(36, 31, 27, 0.8);
}

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule-strong);
  border: 1px solid var(--rule-strong);
}

.page-about .about-stat {
  background: var(--paper);
  padding: 20px 16px 22px;
}

.page-about .about-stat__num {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 7vw, 46px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.page-about .about-stat__unit {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0;
  color: rgba(36, 31, 27, 0.7);
}

.page-about .about-stat__label {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--clay);
}

.page-about .about-stat__text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(36, 31, 27, 0.74);
}

.page-about .about-scale__note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--blue);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(36, 31, 27, 0.82);
}

/* ---------- 四色分类标签页 ---------- */
.page-about .about-taxonomy__lead {
  margin: 0 0 24px;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(36, 31, 27, 0.82);
}

.page-about .about-tabs .tabset__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  border-bottom: 1px solid var(--rule-strong);
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-tabs .tabset__tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: -1px;
  padding: 13px 16px;
  border: 0;
  border-bottom: 3px solid transparent;
  background: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(36, 31, 27, 0.72);
  white-space: nowrap;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.page-about .about-tabs .tabset__tab:hover {
  color: var(--ink);
  background: rgba(221, 235, 230, 0.5);
}

.page-about .about-tabs .tabset__tab[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--clay);
  background: var(--paper);
}

.page-about .about-tabs .tabset__tab:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.page-about .about-tabs__panel {
  padding: 26px 0 0;
  border: 0;
}

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

.page-about .about-tabs__title {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-tabs__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(36, 31, 27, 0.82);
}

.page-about .about-tabs__meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(36, 31, 27, 0.58);
}

.page-about .about-tabs__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-about .about-taxonomy__foot {
  margin: 30px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(36, 31, 27, 0.74);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

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

.page-about .about-team__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-roles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .about-roles__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-roles__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-roles__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--clay);
}

.page-about .about-roles__track {
  position: relative;
  height: 10px;
  margin: 8px 0 10px;
  background: rgba(36, 31, 27, 0.08);
}

.page-about .about-roles__bar {
  display: block;
  height: 100%;
  transition: filter 160ms ease;
}

.page-about .about-roles__bar--spring { width: 42%; background: var(--spring); }
.page-about .about-roles__bar--blue { width: 32%; background: var(--blue); }
.page-about .about-roles__bar--clay { width: 26%; background: var(--clay); }

.page-about .about-roles__item:hover .about-roles__bar {
  filter: brightness(1.12);
}

.page-about .about-roles__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(36, 31, 27, 0.76);
}

.page-about .about-team__note {
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--light-cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--deep);
}

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

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 24px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-timeline__item:first-child {
  border-top-color: var(--rule-strong);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-timeline__month {
  margin-left: 6px;
  font-size: 14px;
  color: var(--clay);
  letter-spacing: 0.08em;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(36, 31, 27, 0.78);
}

.page-about .about-timeline__item--current {
  border-left: 4px solid var(--clay);
  padding-left: 16px;
}

.page-about .about-timeline__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--blue);
  padding-bottom: 2px;
}

.page-about .about-timeline__link:hover,
.page-about .about-timeline__link:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-eco__media {
  margin: 0 0 18px;
}

.page-about .about-eco__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-eco__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(36, 31, 27, 0.8);
}

.page-about .about-eco__cta {
  margin-top: 6px;
}

.page-about .about-eco__side {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  align-content: start;
}

.page-about .about-eco__block .panel__title {
  margin: 6px 0 6px;
  font-size: 17px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-eco__block .panel__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(36, 31, 27, 0.76);
}

.page-about .about-eco__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 32px;
  padding-top: 22px;
  border-top: 1px solid var(--rule-strong);
}

.page-about .about-eco__foot-text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-eco__top {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(36, 31, 27, 0.66);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 2px;
}

.page-about .about-eco__top:hover,
.page-about .about-eco__top:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-who__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: 56px;
    align-items: start;
    padding-bottom: 48px;
  }

  .page-about .about-stat {
    padding: 24px 20px 26px;
  }

  .page-about .about-tabs__panel {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
    padding: 30px 0 0;
  }

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

  .page-about .about-tabs__tags {
    margin-top: 4px;
    justify-content: flex-end;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 44px;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 36px;
    padding: 30px 0;
    align-items: start;
  }

  .page-about .about-timeline__item--current {
    padding-left: 22px;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-eco__side {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-tabs .tabset__tab,
  .page-about .about-roles__bar {
    transition: none;
  }
}
<<<END>>>