.page-about {
  --about-h2-size: clamp(30px, 6.4vw, 56px);
  --about-block-gap: clamp(24px, 5vw, 56px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--turf);
}

.page-about .about-crumb-now {
  color: var(--ink-soft);
  font-weight: 600;
}

.page-about .about-h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: var(--about-h2-size);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--pitch);
}

.page-about .about-h2--light {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 42px) 0 clamp(36px, 6vw, 76px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 11vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--pitch);
}

.page-about .about-hero__title span {
  display: block;
}

.page-about .about-hero__title span:last-child {
  padding-left: clamp(0px, 4vw, 44px);
  color: var(--ink);
}

.page-about .about-hero__title span:last-child::after {
  content: "";
  display: block;
  width: 42%;
  max-width: 220px;
  height: 6px;
  margin-top: clamp(12px, 2vw, 20px);
  border-radius: 3px;
  background: linear-gradient(90deg, var(--ember), var(--neon));
}

.page-about .about-hero__lede {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  max-width: 36em;
}

.page-about .about-hero__note {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--turf);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

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

.page-about .about-hero__fig .media__caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--turf);
}

/* 首屏数据条 */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 52px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--paper-grey);
  border: 1px solid var(--paper-grey);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: var(--paper);
}

.page-about .about-facts__num {
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 600;
  color: var(--ember);
  letter-spacing: 0.01em;
}

.page-about .about-facts__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--turf);
}

/* ---------- 起点与定位 ---------- */
.page-about .about-block {
  border-top: 1px solid var(--paper-grey);
}

.page-about .about-block__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-block-gap);
}

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

.page-about .about-block__body p {
  margin: 0 0 18px;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-block__body .lede {
  color: var(--pitch);
}

.page-about .about-quote {
  margin-top: 26px;
  padding: 20px 0 20px 22px;
  border-left: 3px solid var(--ember);
  background: linear-gradient(90deg, rgba(242, 107, 31, 0.08), rgba(242, 107, 31, 0));
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.4vw, 20px);
  font-weight: 700;
  line-height: 1.6;
  color: var(--pitch);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__head {
  max-width: 44em;
}

.page-about .about-timeline__lede {
  margin-top: 18px;
  max-width: 34em;
}

.page-about .about-tl {
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--paper-grey);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 42px);
  max-width: 38em;
  transition: transform 0.24s var(--ease);
}

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

.page-about .about-tl__dot {
  position: absolute;
  left: -32px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--ember);
  transition: transform 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-tl__when {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--turf);
}

.page-about .about-tl__when .num {
  color: var(--ember);
  font-weight: 600;
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--pitch);
}

.page-about .about-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-tl__item:hover .about-tl__dot {
  transform: scale(1.4);
  background: var(--ember);
}

.page-about .about-tl__item:hover {
  transform: translateX(3px);
}

/* ---------- 团队暗场 ---------- */
.page-about .about-team {
  background: radial-gradient(120% 90% at 12% 0%, var(--pitch-2), var(--pitch) 55%, var(--midnight));
  color: var(--paper);
}

.page-about .about-team .eyebrow {
  color: var(--neon);
}

.page-about .about-team__head {
  max-width: 46em;
}

.page-about .about-team__lede {
  margin-top: 18px;
  max-width: 32em;
  color: var(--turf-light);
}

.page-about .about-roles {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(244, 241, 232, 0.18);
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 14px;
  border-bottom: 1px solid rgba(244, 241, 232, 0.18);
  transition: background 0.22s var(--ease);
}

.page-about .about-roles__row:hover {
  background: rgba(59, 224, 196, 0.09);
}

.page-about .about-roles__count {
  grid-row: 1 / span 2;
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--neon);
}

.page-about .about-roles__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-roles__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--turf-light);
}

.page-about .about-team__fig {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .about-team__fig .media__caption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--turf-light);
}

.page-about .about-team__note {
  margin-top: clamp(22px, 3vw, 32px);
  padding: 18px 20px;
  border: 1px solid rgba(59, 224, 196, 0.35);
  border-radius: 2px;
  background: rgba(23, 69, 58, 0.55);
}

.page-about .about-team__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--turf-light);
}

.page-about .about-team__note-num {
  color: var(--neon);
  font-weight: 600;
  margin-right: 4px;
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-block-gap);
  align-items: center;
}

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

.page-about .about-sources__body .lede {
  margin-top: 18px;
  max-width: 34em;
}

.page-about .about-sources__list {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--paper-grey);
}

.page-about .about-sources__list li {
  padding: 13px 0 13px 18px;
  border-bottom: 1px solid var(--paper-grey);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  position: relative;
}

.page-about .about-sources__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 8px;
  height: 1px;
  background: var(--ember);
}

.page-about .about-sources__list .num {
  font-weight: 600;
  color: var(--pitch);
}

/* 项目覆盖环形图 */
.page-about .about-cover {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 40px);
  align-items: center;
  margin-top: clamp(34px, 5.5vw, 60px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--paper-grey);
}

.page-about .about-ring {
  justify-self: start;
}

.page-about .about-ring__svg {
  display: block;
  width: min(100%, 220px);
  height: auto;
}

.page-about .about-ring__seg {
  transition: stroke-width 0.24s var(--ease);
}

.page-about .about-ring__seg--1 { stroke: var(--ember); }
.page-about .about-ring__seg--2 { stroke: var(--neon); }
.page-about .about-ring__seg--3 { stroke: var(--brick); }
.page-about .about-ring__seg--4 { stroke: var(--turf); }
.page-about .about-ring__seg--5 { stroke: var(--ember-deep); }
.page-about .about-ring__seg--6 { stroke: var(--turf-light); }
.page-about .about-ring__seg--7 { stroke: var(--pitch); }

.page-about .about-ring__center {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  fill: var(--pitch);
}

.page-about .about-ring__center-label {
  font-family: var(--font-body);
  font-size: 11px;
  fill: var(--turf);
}

.page-about .about-cover__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--turf);
}

.page-about .about-cover__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cover__list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-soft);
}

.page-about .about-cover__dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex: 0 0 auto;
}

.page-about .about-cover__dot--1 { background: var(--ember); }
.page-about .about-cover__dot--2 { background: var(--neon); }
.page-about .about-cover__dot--3 { background: var(--brick); }
.page-about .about-cover__dot--4 { background: var(--turf); }
.page-about .about-cover__dot--5 { background: var(--ember-deep); }
.page-about .about-cover__dot--6 { background: var(--turf-light); }
.page-about .about-cover__dot--7 { background: var(--pitch); }

/* ---------- 内容原则 ---------- */
.page-about .about-principles {
  border-top: 1px solid var(--paper-grey);
}

.page-about .about-principles__title {
  max-width: 16em;
}

.page-about .about-rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--paper-grey);
  border: 1px solid var(--paper-grey);
}

.page-about .about-rules__item {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: var(--paper);
  transition: background 0.22s var(--ease);
}

.page-about .about-rules__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--ember);
}

.page-about .about-rules__item:nth-child(2)::before { background: var(--neon); }
.page-about .about-rules__item:nth-child(3)::before { background: var(--brick); }
.page-about .about-rules__item:nth-child(4)::before { background: var(--pitch); }

.page-about .about-rules__item:hover {
  background: #FBF9F3;
}

.page-about .about-rules__idx {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--turf);
}

.page-about .about-rules__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--pitch);
}

.page-about .about-rules__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 接着往下看 ---------- */
.page-about .about-next {
  background: linear-gradient(180deg, var(--paper) 0%, #EFEBE0 100%);
  border-top: 1px solid var(--paper-grey);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  align-items: start;
}

.page-about .about-next__text {
  margin: 16px 0 0;
  max-width: 30em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--paper-grey);
  border: 1px solid var(--paper-grey);
}

.page-about .about-next__link {
  display: block;
  padding: 18px 20px;
  background: var(--paper);
  text-decoration: none;
  transition: background 0.22s var(--ease), padding-left 0.22s var(--ease);
}

.page-about .about-next__link:hover {
  background: var(--paper);
  padding-left: 26px;
  background-image: linear-gradient(90deg, rgba(242, 107, 31, 0.12), rgba(242, 107, 31, 0));
}

.page-about .about-next__link-title {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--pitch);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.page-about .about-next__link-text {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--turf);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-hero__fig {
    transform: translateY(30px);
  }

  .page-about .about-block__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

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

  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-cover {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-roles__row {
    grid-template-columns: 84px 190px minmax(0, 1fr);
    align-items: baseline;
    gap: 0 24px;
    padding: 20px 18px;
  }

  .page-about .about-roles__count {
    grid-row: auto;
  }

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

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 6vw, 80px);
  }

  .page-about .about-tl {
    padding-left: 34px;
  }

  .page-about .about-tl__dot {
    left: -40px;
    width: 13px;
    height: 13px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__note {
    max-width: 40em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-tl__dot,
  .page-about .about-roles__row,
  .page-about .about-next__link,
  .page-about .about-rules__item {
    transition: none;
  }

  .page-about .about-tl__item:hover {
    transform: none;
  }
}
<<<END>>>