.page-about {
  --about-gap: clamp(22px, 4vw, 48px);
  --about-bar: 2px;
  --about-radius: 2px;
}

.page-about .about-crumb-sep {
  margin: 0 .5em;
  color: var(--gray);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 5vw, 56px);
  padding-bottom: clamp(30px, 6vw, 64px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__lead {
  padding-right: 10px;
}

.page-about .about-title {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.15rem, 7.6vw, 4.35rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--cream);
  margin: .28em 0 .5em;
  transform: skewX(-4deg);
  transform-origin: left bottom;
  max-width: 20ch;
}

.page-about .about-lede {
  color: var(--ink-soft);
  font-size: clamp(1rem, 2.4vw, 1.075rem);
  line-height: 1.78;
  max-width: 42ch;
  margin: 0 0 18px;
}

.page-about .about-hero__meta {
  color: var(--gray);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--orange);
}

.page-about .about-hero__aside {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-stat {
  background: var(--carbon);
  padding: 16px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2.05rem);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -.01em;
}

.page-about .about-stat:nth-child(3) .about-stat__num,
.page-about .about-stat:nth-child(4) .about-stat__num {
  color: var(--blue);
}

.page-about .about-stat__unit {
  font-size: .8rem;
  color: var(--gray);
  line-height: 1.4;
}

.page-about .about-toc {
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--clay);
  padding: 16px 18px 18px;
  background: var(--veil);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-toc a {
  color: var(--cream);
  text-decoration: none;
  font-size: .92rem;
  display: inline-block;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

/* ---------- 通用分栏 ---------- */
.page-about .about-block {
  padding-top: clamp(28px, 5vw, 46px);
  padding-bottom: clamp(28px, 5vw, 46px);
}

.page-about .about-split {
  display: grid;
  gap: 20px;
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-top: var(--about-bar) solid var(--line-soft);
  padding-top: 10px;
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--orange);
  letter-spacing: .02em;
}

.page-about .about-rail__label {
  font-size: .74rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-h2 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.6vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--cream);
  margin: 0 0 14px;
}

.page-about .about-sub {
  color: var(--gray);
  font-size: .92rem;
  line-height: 1.7;
  margin: 0 0 22px;
  max-width: 40ch;
}

.page-about .about-body .prose p {
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.page-about .about-inline-link {
  margin: 20px 0 0;
  font-size: .92rem;
  color: var(--gray);
}

.page-about .about-inline-link a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 182, 255, .45);
}

.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  border-bottom-color: var(--blue);
}

/* ---------- 奶油展签 ---------- */
.page-about .about-plate {
  margin: 22px 0 0;
  padding: 20px 22px;
}

.page-about .about-plate__label {
  margin: 0 0 8px;
  font-size: .7rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--clay);
  font-weight: 700;
}

.page-about .about-plate p {
  margin: 0;
  color: var(--ink);
  font-size: .95rem;
  line-height: 1.7;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  position: relative;
  padding-left: 28px;
  display: grid;
  gap: 14px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--blue) 50%, var(--orange));
  opacity: .55;
}

.page-about .about-node {
  position: relative;
  border-radius: var(--about-radius);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 15px;
  width: 12px;
  height: 12px;
  background: var(--carbon);
  border: 2px solid var(--blue);
  transform: skewX(-14deg);
  transition: background .2s ease, border-color .2s ease;
}

.page-about .about-node[open]::before {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .about-node--plan::before {
  border-color: var(--amber);
}

.page-about .about-node > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 16px;
  background: var(--carbon);
  border: 1px solid var(--line-soft);
  transition: transform .2s ease, border-color .2s ease;
}

.page-about .about-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node > summary:hover {
  transform: translateY(-2px);
  border-color: var(--clay);
}

.page-about .about-node > summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.page-about .about-node__ver {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .84rem;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-about .about-node--plan .about-node__ver {
  color: var(--amber);
}

.page-about .about-node__title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--cream);
}

.page-about .about-node__brief {
  grid-column: 2 / -1;
  font-size: .84rem;
  color: var(--gray);
}

.page-about .about-node__mark::before {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--gray);
  font-size: .9rem;
}

.page-about .about-node[open] .about-node__mark::before {
  content: "－";
  color: var(--orange);
}

.page-about .about-node__panel {
  padding: 14px 16px 18px;
  border: 1px solid var(--line-soft);
  border-top: 0;
  background: var(--veil);
}

.page-about .about-node__panel p {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: .93rem;
  line-height: 1.75;
}

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

.page-about .about-node__tagline {
  margin-bottom: 8px;
}

/* ---------- 团队 ---------- */
.page-about .about-figure {
  margin: 24px 0;
  border: 1px solid var(--line-soft);
  background: var(--carbon);
}

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

.page-about .about-figure--night img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--note img {
  aspect-ratio: 3 / 4;
}

.page-about .about-figure .figure__caption {
  color: var(--gray);
  font-size: .8rem;
  line-height: 1.6;
  padding: 10px 14px 12px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-roles {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  padding: 18px;
  background: var(--carbon);
  border-left: 3px solid var(--blue);
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--blue);
  grid-row: 1 / 3;
}

.page-about .about-role__name {
  font-weight: 700;
  color: var(--cream);
  font-size: 1rem;
  align-self: end;
}

.page-about .about-role p {
  margin: 0;
  grid-column: 2;
  color: var(--ink-soft);
  font-size: .92rem;
  line-height: 1.72;
}

/* ---------- 四条内容线 ---------- */
.page-about .about-cities {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

.page-about .about-city {
  padding: 16px 18px;
  background: var(--carbon);
  border-top: 2px solid var(--clay);
  transition: transform .2s ease;
}

.page-about .about-city:hover {
  transform: translateY(-2px);
}

.page-about .about-city h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--cream);
  letter-spacing: .01em;
}

.page-about .about-city p {
  margin: 0;
  color: var(--ink-soft);
  font-size: .9rem;
  line-height: 1.72;
}

.page-about .about-city--sh {
  border-top-color: var(--orange);
}

.page-about .about-city--gd {
  border-top-color: var(--neon);
}

.page-about .about-city--cd {
  border-top-color: var(--blue);
}

.page-about .about-city--hz {
  border-top-color: var(--amber);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 20px 18px 20px 22px;
  background: var(--carbon);
  border: 1px solid var(--line-soft);
  outline: none;
  transition: transform .2s ease, border-color .2s ease;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--neon);
}

.page-about .about-step:nth-child(2)::before {
  background: var(--blue);
}

.page-about .about-step:nth-child(3)::before {
  background: var(--orange);
}

.page-about .about-step:hover,
.page-about .about-step:focus-visible {
  transform: translateY(-2px);
  border-color: var(--clay);
}

.page-about .about-step:focus-visible {
  box-shadow: 0 0 0 2px var(--blue);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.65rem;
  line-height: 1;
  color: var(--orange);
  margin-bottom: 10px;
  letter-spacing: .02em;
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-step p {
  margin: 0;
  color: var(--ink-soft);
  font-size: .9rem;
  line-height: 1.72;
}

.page-about .about-side {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.page-about .about-side .about-figure {
  margin: 0;
}

.page-about .about-note {
  border-left: 3px solid var(--clay);
  padding: 4px 0 4px 16px;
}

.page-about .about-note__label {
  margin: 0 0 8px;
  font-size: .7rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-note p {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: .9rem;
  line-height: 1.72;
}

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

.page-about .about-note a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 182, 255, .45);
}

/* ---------- 边界 ---------- */
.page-about .about-limits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-limits li {
  background: var(--ink);
  padding: 18px;
}

.page-about .about-limits__k {
  display: block;
  font-weight: 700;
  color: var(--cream);
  font-size: .98rem;
  margin-bottom: 6px;
  padding-left: 14px;
  position: relative;
}

.page-about .about-limits__k::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5em;
  width: 8px;
  height: 8px;
  background: var(--red);
  transform: skewX(-14deg);
}

.page-about .about-limits p {
  margin: 0;
  color: var(--gray);
  font-size: .9rem;
  line-height: 1.72;
  padding-left: 14px;
}

/* ---------- 页尾赛道 ---------- */
.page-about .about-outro {
  padding-top: clamp(30px, 5vw, 52px);
  padding-bottom: clamp(38px, 6vw, 70px);
}

.page-about .about-track {
  height: 10px;
  margin-bottom: 26px;
  background: repeating-linear-gradient(
    100deg,
    var(--clay) 0 18px,
    transparent 18px 34px
  );
  opacity: .55;
}

.page-about .about-outro__text {
  color: var(--ink-soft);
  font-size: .95rem;
  line-height: 1.75;
  max-width: 46ch;
  margin: 0 0 22px;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-title {
    transform: skewX(var(--skew));
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 4.4fr) minmax(0, 7.6fr);
    align-items: start;
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(26px, 4vw, 58px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 118px;
    align-self: start;
    border-top: 0;
    border-left: var(--about-bar) solid var(--line-soft);
    padding: 2px 0 2px 16px;
  }

  .page-about .about-rail__no {
    display: block;
    font-size: 1.5rem;
    margin-bottom: 8px;
  }

  .page-about .about-rail__label {
    display: block;
    letter-spacing: .18em;
  }

  .page-about .about-side {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(20px, 3vw, 34px);
    align-items: start;
    margin-top: 32px;
  }

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

  .page-about .about-role {
    grid-template-columns: 1fr;
    align-content: start;
  }

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

  .page-about .about-role p {
    grid-column: 1;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node > summary,
  .page-about .about-city,
  .page-about .about-step,
  .page-about .about-toc a,
  .page-about .about-node::before {
    transition: none;
  }

  .page-about .about-node > summary:hover,
  .page-about .about-city:hover,
  .page-about .about-step:hover {
    transform: none;
  }
}