.page-about {
  --about-rail: 236px;
  background: var(--deep);
  color: var(--ice);
  font-family: var(--font-body);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 52px) 0 clamp(30px, 5vw, 56px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: min(620px, 80vw);
  height: min(620px, 80vw);
  background: radial-gradient(circle, rgba(255, 107, 26, .17) 0%, rgba(255, 107, 26, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 18px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 8.4vw, 92px);
  font-weight: 900;
  line-height: .98;
  letter-spacing: -.025em;
}

.page-about .about-hero__title .hl {
  color: var(--orange);
}

.page-about .about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-hero__aside .lede {
  margin: 0;
  max-width: 46ch;
}

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

.page-about .about-facts {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-facts__item {
  background: var(--deck);
  padding: 18px clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-facts__num {
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-about .about-facts__num em {
  font-style: normal;
  color: var(--amber);
}

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

/* ===== 主体双栏 ===== */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-bottom: clamp(52px, 8vw, 104px);
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 4px;
}

.page-about .about-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__list a {
  display: block;
  white-space: nowrap;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--ice);
  border-color: var(--orange);
  background: rgba(255, 107, 26, .08);
  outline: none;
}

.page-about .about-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(38px, 5.5vw, 70px);
  min-width: 0;
}

.page-about .about-section {
  border-top: 1px solid var(--line);
  padding-top: clamp(28px, 4vw, 46px);
  min-width: 0;
}

.page-about .about-section__no {
  display: block;
  margin: 0 0 12px;
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-section__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.2vw, 42px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.015em;
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.78;
}

.page-about .about-main a:not(.btn) {
  color: var(--ice);
  text-decoration: underline;
  text-decoration-color: rgba(255, 107, 26, .55);
  text-underline-offset: 3px;
  transition: color .2s ease, text-decoration-color .2s ease;
}

.page-about .about-main a:not(.btn):hover,
.page-about .about-main a:not(.btn):focus-visible {
  color: var(--orange);
  text-decoration-color: var(--orange);
  outline: none;
}

/* ===== 01 定位索引 ===== */
.page-about .about-index {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-index__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-index__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__no {
  font-size: 13px;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .about-index__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-index__body p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

/* ===== 02 团队 ===== */
.page-about .team-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .role {
  background: var(--deck);
  padding: 20px 18px 22px;
}

.page-about .role__title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 800;
  color: var(--ice);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .role__title::before {
  content: "";
  width: 18px;
  height: 3px;
  border-radius: var(--pill);
  background: var(--orange);
  flex: none;
}

.page-about .role__desc {
  margin: 0;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .city-map {
  margin: 24px 0 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(17, 26, 51, .92), rgba(11, 16, 32, .92));
}

.page-about .city-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .city-map__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--mist);
}

.page-about .city-map__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .city-map__dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: var(--pill);
  flex: none;
}

.page-about .city-map__dot--cq {
  background: var(--orange);
}

.page-about .city-map__dot--cd {
  background: var(--violet);
}

/* ===== 03 流程 ===== */
.page-about .flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .flow__step {
  position: relative;
  background: var(--deck);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 20px 16px 22px;
  transition: transform .22s ease, border-color .22s ease;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 16px;
  width: 26px;
  height: 3px;
  border-radius: 0 0 var(--pill) var(--pill);
  background: var(--orange);
}

.page-about .flow__step:hover {
  transform: translateY(-4px);
  border-color: var(--orange);
}

.page-about .flow__no {
  display: block;
  font-size: 12.5px;
  color: var(--amber);
  letter-spacing: .12em;
  margin-bottom: 8px;
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
}

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

.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 20px;
}

.page-about .cadence__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 18px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--pill);
  background: rgba(17, 26, 51, .55);
}

.page-about .cadence__time {
  font-size: 18px;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
  flex: none;
}

.page-about .cadence__desc {
  font-size: 13px;
  color: var(--mist);
}

/* ===== 04 时间线 ===== */
.page-about .timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), rgba(255, 107, 26, .06));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 28px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: var(--pill);
  background: var(--deep);
  border: 2px solid var(--steel);
  transition: border-color .2s ease, background .2s ease;
}

.page-about .timeline__item:hover::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .timeline__node {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .timeline__item p {
  margin: 0;
  max-width: 58ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

/* ===== 05 合作生态 ===== */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 24px;
}

.page-about .eco__node {
  background: var(--deck);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  overflow: hidden;
  transition: border-color .22s ease, transform .22s ease;
}

.page-about .eco__node:hover {
  border-color: var(--orange);
  transform: translateY(-4px);
}

.page-about .eco__node[open] {
  border-color: var(--orange);
}

.page-about .eco__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px;
  cursor: pointer;
  list-style: none;
  font-weight: 800;
  color: var(--ice);
}

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

.page-about .eco__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--mist);
  transition: color .2s ease;
}

.page-about .eco__node[open] .eco__summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .eco__summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -2px;
}

.page-about .eco__count {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -.02em;
}

.page-about .eco__count em {
  font-style: normal;
  color: var(--amber);
}

.page-about .eco__name {
  font-size: 16px;
}

.page-about .eco__node p {
  margin: 0;
  padding: 0 18px 20px;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.72;
}

.page-about .eco__honor {
  margin: 20px 0 0;
  padding: 12px 18px;
  border-radius: var(--pill);
  border: 1px solid rgba(255, 176, 32, .35);
  background: rgba(255, 176, 32, .08);
  color: var(--amber);
  font-size: 13.5px;
  line-height: 1.6;
}

/* ===== 06 对接 ===== */
.page-about .reach {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .reach__item {
  border-left: 2px solid var(--steel);
  padding: 4px 0 4px 18px;
  transition: border-color .2s ease;
}

.page-about .reach__item:hover {
  border-left-color: var(--orange);
}

.page-about .reach__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .reach__item p {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .reach__trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ===== 图片容器 ===== */
.page-about .about-figure {
  margin: 26px 0 0;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--deck);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 12px 18px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ===== 响应式 ===== */
@media (min-width: 560px) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 680px) {
  .page-about .team-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .reach {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 28px;
  }
}

@media (min-width: 720px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: end;
  }

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

  .page-about .about-figure--narrow {
    max-width: 78%;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__list a {
    white-space: normal;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 10px 14px;
    font-size: 15px;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    background: rgba(255, 107, 26, .07);
    border-left-color: var(--orange);
  }

  .page-about .about-index__item {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .eco__node,
  .page-about .timeline__item::before,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .flow__step:hover,
  .page-about .eco__node:hover {
    transform: none;
  }
}