.page-about {
  --about-gap: clamp(1.25rem, 3vw, 2rem);
  --about-pad: clamp(1.1rem, 2.4vw, 1.6rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .breadcrumb {
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
  margin-bottom: .35rem;
}

/* ---------- 首屏 ---------- */
.about-hero {
  padding-top: clamp(1.25rem, 4vw, 2.5rem);
  padding-bottom: clamp(2.25rem, 6vw, 3.75rem);
}

.about-hero h1 {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 26ch;
}

.about-hero__lead {
  margin: 0;
  max-width: 46rem;
  color: var(--mist);
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
}

.about-hero__stats {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .metric {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 .2rem;
  padding: 1.1rem 1.1rem 1rem;
  background: var(--ink-800);
}

.page-about .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.page-about .metric__unit {
  font-family: var(--font-mono);
  font-size: .95rem;
  color: var(--accent);
}

.page-about .metric__label {
  flex: 1 0 100%;
  margin-top: .55rem;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 章节通用间距 ---------- */
.about-history,
.about-lines,
.about-team,
.about-scale,
.about-cred {
  padding-top: clamp(2.5rem, 6vw, 4.25rem);
}

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

.page-about .figure__frame {
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-about .figure__caption {
  margin-top: .7rem;
  font-size: .8125rem;
  color: var(--mist);
  letter-spacing: .02em;
}

/* ---------- 发展历程 ---------- */
.about-history__grid {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.about-timeline {
  position: relative;
  padding-left: 1.75rem;
  display: grid;
  gap: .7rem;
  align-content: start;
}

.about-timeline::before {
  content: "";
  position: absolute;
  left: .5rem;
  top: .9rem;
  bottom: .9rem;
  border-left: 2px dashed var(--ink-700);
}

.tl {
  position: relative;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease);
}

.tl::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: .95rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-700);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}

.tl[open] {
  background: var(--ink-800);
  border-color: var(--line);
}

.tl[open]::before {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 106, 31, .16);
}

.tl__summary {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .8rem .9rem .7rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
}

.tl__summary::-webkit-details-marker {
  display: none;
}

.tl__year {
  font-size: .875rem;
  letter-spacing: .04em;
  color: var(--cyan);
}

.tl[open] .tl__year {
  color: var(--accent);
}

.tl__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  color: var(--white);
  letter-spacing: -0.01em;
}

.tl__body {
  padding: 0 .9rem .95rem;
}

.tl__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--mist);
}

.about-history__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  align-content: start;
}

.about-cap {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(165deg, var(--ink-800), var(--ink-900));
  box-shadow: var(--shadow-1);
}

.about-cap__num {
  display: block;
  font-size: clamp(1.6rem, 3.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.about-cap h3 {
  margin: .55rem 0 .35rem;
  font-size: 1rem;
  color: var(--white);
}

.about-cap p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--mist);
}

.about-cap:nth-child(2) .about-cap__num {
  color: var(--cyan);
}

.about-cap:nth-child(3) .about-cap__num {
  color: var(--clay);
}

.about-cap:nth-child(4) .about-cap__num {
  color: var(--moss);
}

.about-history__figure {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-history__figure .figure__frame {
  --figure-ratio: 16 / 7;
  aspect-ratio: var(--figure-ratio);
}

/* ---------- 四条主线 ---------- */
.about-matrix {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.about-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .65rem;
  padding: calc(var(--about-pad) + .25rem) var(--about-pad) var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--ink-800), var(--ink-900) 72%);
  overflow: hidden;
}

.about-cell::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), transparent 82%);
}

.about-cell:nth-child(2)::before {
  background: linear-gradient(90deg, var(--cyan), transparent 82%);
}

.about-cell:nth-child(3)::before {
  background: linear-gradient(90deg, var(--clay), transparent 82%);
}

.about-cell:nth-child(4)::before {
  background: linear-gradient(90deg, var(--moss), transparent 82%);
}

.about-cell__icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: var(--r-sm);
  background: rgba(255, 106, 31, .12);
  color: var(--accent);
}

.about-cell__icon svg {
  width: 22px;
  height: 22px;
}

.about-cell:nth-child(2) .about-cell__icon {
  background: rgba(41, 224, 208, .12);
  color: var(--cyan);
}

.about-cell:nth-child(3) .about-cell__icon {
  background: rgba(194, 96, 58, .16);
  color: var(--clay);
}

.about-cell:nth-child(4) .about-cell__icon {
  background: rgba(109, 127, 106, .2);
  color: var(--moss);
}

.about-cell h3 {
  margin: 0;
  font-size: 1.125rem;
  color: var(--white);
}

.about-cell p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--mist);
}

.about-cell__link {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 3px;
  font-size: .875rem;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 224, 208, .35);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.about-cell__link:hover,
.about-cell__link:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

/* ---------- 人群横带 ---------- */
.page-about .about-crowd {
  margin-top: clamp(2.5rem, 6vw, 4.25rem);
  padding-bottom: clamp(2.25rem, 5vw, 3.5rem);
  background:
    radial-gradient(120% 150% at 12% 0%, rgba(194, 96, 58, .3), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.about-crowd .section-head {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.about-crowd__track {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0 0 .7rem;
  display: flex;
  gap: .6rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.about-crowd__track li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.about-crowd__track .chip {
  display: inline-block;
  white-space: nowrap;
  padding: .5rem 1rem;
  font-size: .875rem;
}

.about-crowd__track::-webkit-scrollbar {
  height: 6px;
}

.about-crowd__track::-webkit-scrollbar-thumb {
  background: var(--ink-700);
  border-radius: 999px;
}

.about-crowd__notes {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.about-crowd__notes > div {
  padding: var(--about-pad);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(3, 7, 16, .42);
}

.about-crowd__notes h3 {
  margin: 0 0 .4rem;
  font-size: 1rem;
  color: var(--rice);
}

.about-crowd__notes p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.about-team__figure {
  margin-top: var(--about-gap);
}

.page-about .about-team__figure .figure__frame {
  --figure-ratio: 14 / 9;
  aspect-ratio: var(--figure-ratio);
}

.about-team__grid {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.about-bar {
  margin-bottom: 1.05rem;
}

.about-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-size: .9rem;
  color: var(--white);
}

.about-bar__num {
  font-size: .875rem;
  color: var(--accent);
}

.about-bar__track {
  margin-top: .5rem;
  height: 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  overflow: hidden;
}

.about-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
}

.about-bar:nth-child(2) .about-bar__fill {
  background: linear-gradient(90deg, var(--cyan), var(--moss));
}

.about-bar:nth-child(3) .about-bar__fill {
  background: linear-gradient(90deg, var(--clay), var(--accent));
}

.about-bar:nth-child(4) .about-bar__fill {
  background: linear-gradient(90deg, var(--moss), var(--cyan));
}

.about-team__note {
  margin: .35rem 0 0;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--mist);
}

.about-fold {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
  overflow: hidden;
}

.about-fold details {
  border-bottom: 1px solid var(--line-soft);
}

.about-fold details:last-child {
  border-bottom: 0;
}

.about-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .95rem 1.1rem;
  cursor: pointer;
  list-style: none;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--white);
}

.about-fold summary::-webkit-details-marker {
  display: none;
}

.about-fold summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--cyan);
}

.about-fold details[open] summary::after {
  content: "–";
  color: var(--accent);
}

.about-fold__body {
  padding: 0 1.1rem 1rem;
}

.about-fold__body p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 覆盖与运行 ---------- */
.about-scale__grid {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line-soft);
  overflow: hidden;
}

.about-stat {
  padding: 1rem 1.1rem;
  background: var(--ink-800);
}

.about-stat__num {
  display: block;
  font-size: clamp(1.4rem, 3.4vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.about-stat__num em {
  font-style: normal;
  font-size: .68em;
  margin-left: .15rem;
}

.about-stat__label {
  display: block;
  margin-top: .45rem;
  font-size: .8125rem;
  color: var(--mist);
  letter-spacing: .02em;
}

.page-about .about-scale__figure .figure__frame {
  --figure-ratio: 3 / 2;
  aspect-ratio: var(--figure-ratio);
}

/* ---------- 资质与收尾 ---------- */
.about-cred__grid {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.about-cred__card {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
}

.about-cred__card h3 {
  margin: 0 0 .5rem;
  font-size: 1.0625rem;
  color: var(--white);
}

.about-cred__card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--mist);
}

.about-cta {
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background:
    radial-gradient(110% 150% at 100% 0%, rgba(41, 224, 208, .16), transparent 58%),
    linear-gradient(120deg, rgba(255, 106, 31, .16), var(--ink-800) 68%);
}

.about-cta h2 {
  margin: 0 0 .7rem;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  letter-spacing: -0.02em;
  color: var(--white);
}

.about-cta p {
  margin: 0 0 1.35rem;
  max-width: 46rem;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--mist);
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .about-crowd__notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .about-crowd__notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .about-scale__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .about-history__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.35fr);
  }

  .about-cap:nth-child(2) {
    margin-top: 1.5rem;
  }

  .about-cap:nth-child(3) {
    margin-top: .75rem;
  }

  .about-cap:nth-child(4) {
    margin-top: 2.25rem;
  }
}

@media (min-width: 1100px) {
  .about-matrix {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .tl,
  .tl::before,
  .about-cell__link {
    transition: none;
  }
}

.page-about {
  --w: 1rem;
}