.page-about {
  --about-rail: 220px;
  --about-gap: clamp(1.25rem, 3vw, 2.5rem);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 4vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background: var(--pine);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  top: -25%;
  width: 64%;
  height: 150%;
  background: linear-gradient(158deg, rgba(69, 240, 178, 0.16), rgba(69, 240, 178, 0) 64%);
  transform: skewX(-14deg);
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 clamp(1.25rem, 4vw, 2.5rem);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-crumbs a {
  color: var(--mint);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  text-decoration: underline;
  outline: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__head {
  min-width: 0;
}

.page-about .about-hero__head .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.page-about .about-hero h1 {
  margin: 0.6rem 0 0;
  font-family: var(--font-head);
  font-size: clamp(2.05rem, 6.4vw, 4rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.035em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: clamp(1rem, 2.6vw, 1.5rem) 0 0;
  max-width: 44rem;
  font-size: clamp(0.98rem, 1.5vw, 1.12rem);
  line-height: 1.82;
  color: var(--paper);
  opacity: 0.9;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__card {
  border: 2px solid var(--line);
  background: var(--card);
  box-shadow: var(--slab);
  padding: clamp(1rem, 2.4vw, 1.5rem);
  min-width: 0;
}

.page-about .about-hero__card-title {
  margin: 0 0 0.9rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-stats {
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stats > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-stats dt {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 0;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--mint);
}

/* ---------- 外壳与章节索引 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(1.75rem, 5vw, 3.25rem);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
}

.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc__label {
  margin: 0 0 0.75rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0.6rem;
  border-left: 2px solid transparent;
  font-size: 0.88rem;
  color: var(--paper);
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-toc__list a span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--mint);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  background: rgba(69, 240, 178, 0.1);
  border-left-color: var(--mint);
  color: var(--mint-soft);
  outline: none;
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(1.75rem, 4vw, 3rem) 0;
  border-top: 2px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-sec__head .section-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-sec__title {
  margin: 0.55rem 0 0;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-sec__lede {
  margin: 0.8rem 0 0;
  max-width: 40rem;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .about-team__card {
  flex: 1 1 200px;
  min-width: 0;
  padding: 1.1rem 1.15rem 1.3rem;
  border: 2px solid var(--line);
  background: var(--pine);
  box-shadow: var(--slab-sm);
}

.page-about .about-team__card--primary {
  flex: 2 1 300px;
  background: var(--card);
  border-color: var(--mint);
}

.page-about .about-team__num {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--mint);
}

.page-about .about-team__num span {
  margin-left: 0.25rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
}

.page-about .about-team__card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.72;
  color: var(--muted);
}

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

.page-about .about-strip__cell {
  display: grid;
  gap: 0.3rem;
  padding: 0.85rem 0.9rem;
  background: var(--pine);
  min-width: 0;
}

.page-about .about-strip__key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-strip__val {
  font-family: var(--font-mono);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--mint);
}

.page-about .about-strip__cell:nth-child(4) .about-strip__val {
  color: var(--amber);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  border: 2px solid var(--line);
  background: var(--card);
  box-shadow: var(--slab);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
}

.page-about .about-figure figcaption {
  padding: 0.7rem 0.95rem;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 1.5rem 1.7rem;
  border-left: 2px solid var(--line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  background: var(--mint);
  border: 2px solid var(--ink);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item:last-child::before {
  background: var(--amber);
}

.page-about .about-timeline__year {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mint);
}

.page-about .about-timeline__item:last-child .about-timeline__year {
  color: var(--amber);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .about-timeline__item p:last-child {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.74;
  color: var(--muted);
}

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

.page-about .about-flow li {
  min-width: 0;
  padding: 1rem 1.1rem 1.2rem;
  border-top: 3px solid var(--mint);
  background: var(--pine);
}

.page-about .about-flow li:nth-child(2) {
  border-top-color: var(--mint-soft);
}

.page-about .about-flow li:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-flow__step {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-flow h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--paper);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-callout {
  margin: 1.25rem 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.6rem;
  padding: 1.1rem 1.2rem;
  border: 2px solid var(--line);
  border-left: 6px solid var(--amber);
  background: var(--card);
  box-shadow: var(--slab-sm);
}

.page-about .about-callout__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-callout p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.76;
  color: var(--paper);
}

.page-about .about-states {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem !important;
}

.page-about .about-states span {
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-states span:nth-child(1) {
  color: var(--amber);
  border-color: var(--amber);
}

.page-about .about-states span:nth-child(2) {
  color: var(--mint-soft);
  border-color: var(--mint-soft);
}

.page-about .about-states span:nth-child(3) {
  color: var(--mint);
  border-color: var(--mint);
}

/* ---------- 网络 ---------- */
.page-about .about-network {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .about-network__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-network__list li {
  display: grid;
  grid-template-columns: 4.4rem minmax(0, 1fr);
  gap: 0.9rem;
  align-items: baseline;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-network__num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--mint);
}

.page-about .about-map__wrap {
  min-width: 0;
}

.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.55rem;
  padding: 1rem;
  border: 2px solid var(--line);
  background: var(--pine);
  box-shadow: var(--slab-sm);
}

.page-about .about-map__dot {
  display: block;
  aspect-ratio: 1 / 1;
  background: rgba(69, 240, 178, 0.34);
}

.page-about .about-map__dot--anchor {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(246, 184, 74, 0.22);
}

.page-about .about-map__note {
  margin: 0.7rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 伙伴与出口 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-partners article {
  min-width: 0;
  padding: 1.1rem 1.15rem 1.3rem;
  border: 2px solid var(--line);
  background: var(--pine);
}

.page-about .about-partners h3 {
  margin: 0 0 0.55rem;
  font-size: 1.02rem;
  color: var(--mint);
}

.page-about .about-partners p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.74;
  color: var(--muted);
}

.page-about .about-next {
  margin-top: clamp(1.25rem, 3vw, 2rem);
  padding: clamp(1rem, 2.4vw, 1.5rem);
  border: 2px solid var(--line);
  background: var(--card);
  box-shadow: var(--slab);
}

.page-about .about-next h3 {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-next__links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.page-about .about-next__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--paper);
  text-decoration: none;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.page-about .about-next__links a::after {
  content: "→";
  flex: none;
  font-family: var(--font-mono);
  color: var(--mint);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  background: rgba(69, 240, 178, 0.1);
  border-color: var(--mint);
  color: var(--mint-soft);
  outline: none;
}

.page-about .about-contact {
  margin-top: 1rem;
  padding: 1.1rem 1.25rem;
  border-left: 6px solid var(--mint);
  background: var(--pine);
  display: grid;
  gap: 0.5rem;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-contact p {
  margin: 0;
  overflow-wrap: anywhere;
}

.page-about .about-contact__title {
  font-family: var(--font-head);
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-callout {
    grid-template-columns: 9rem minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.4rem;
    padding-top: 2.3rem;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 0.95rem;
    height: 2px;
    background: var(--line);
  }

  .page-about .about-timeline__item {
    padding: 0;
    border-left: 0;
  }

  .page-about .about-timeline__item::before {
    left: 0;
    top: -1.85rem;
    width: 10px;
    height: 10px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 6rem;
  }

  .page-about .about-toc__list {
    display: grid;
    gap: 0.1rem;
  }
}

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