.page-about {
  --about-rail: 108px;
  --hair: rgba(232, 179, 60, .28);
  --hair-soft: rgba(230, 234, 245, .12);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.6rem, 4vw, 2.8rem);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 3.4rem);
  align-items: start;
  margin-top: clamp(1.6rem, 3.4vw, 2.6rem);
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.6vw, 3.6rem);
  line-height: 1.24;
  letter-spacing: .05em;
  margin: .5rem 0 1.1rem;
  color: var(--text);
  text-shadow: 0 0 60px rgba(123, 95, 214, .35);
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  line-height: 1.38;
  letter-spacing: .045em;
  margin: .5rem 0 1rem;
  color: var(--text);
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 2.1vw, 1.2rem);
  line-height: 1.5;
  letter-spacing: .04em;
  margin: 0 0 .6rem;
  color: var(--gold-soft);
}

.page-about .lead {
  font-size: clamp(.98rem, 1.6vw, 1.1rem);
  line-height: 1.95;
  color: var(--text-dim);
  max-width: 60ch;
  margin: 0 0 clamp(1.6rem, 3vw, 2.2rem);
}

.page-about p {
  line-height: 1.92;
  color: var(--text-dim);
  margin: 0 0 1rem;
}

.page-about .hero-figure {
  --media-ratio: 3 / 2;
  border: 1px solid var(--hair-soft);
  margin: 0;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 1.6rem);
  padding-top: clamp(1.2rem, 2.6vw, 1.8rem);
  border-top: 1px solid var(--hair-soft);
}

.page-about .stat__value em {
  font-style: normal;
  font-size: .6em;
  margin-left: .1em;
  color: var(--gold);
}

@media (min-width: 880px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .82fr);
  }
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 起点与主线 ---------- */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 3vw, 2.6rem);
}

.page-about .origin-aside .vnote {
  display: none;
}

.page-about .origin-body p {
  max-width: 68ch;
}

.page-about .origin-facts {
  list-style: none;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

@media (min-width: 1020px) {
  .page-about .origin-grid {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.6rem);
  }
  .page-about .origin-aside {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.4rem;
  }
  .page-about .origin-aside .vnote {
    display: inline-block;
  }
}

/* ---------- 四条能力线 ---------- */
.page-about .cap-head {
  max-width: 62ch;
  margin-bottom: clamp(1.6rem, 3vw, 2.4rem);
}

.page-about .cap-media {
  --media-ratio: 21 / 9;
  border: 1px solid var(--hair-soft);
  margin: 0 0 clamp(1.6rem, 3.4vw, 2.6rem);
}

.page-about .cap-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(.9rem, 2.2vw, 1.5rem);
}

.page-about .cap-card {
  position: relative;
  padding: clamp(1.3rem, 2.6vw, 1.9rem) clamp(1.2rem, 2.4vw, 1.8rem);
  background: linear-gradient(150deg, rgba(20, 26, 69, .88), rgba(10, 14, 42, .72));
  border: 1px solid var(--hair-soft);
  border-left: 3px solid var(--nebula);
  transition: transform .34s var(--ease), border-color .34s var(--ease), background .34s var(--ease);
}

.page-about .cap-card:nth-child(1) { border-left-color: var(--copper-base); }
.page-about .cap-card:nth-child(2) { border-left-color: var(--copper-top); }
.page-about .cap-card:nth-child(3) { border-left-color: var(--cyan-stock); }
.page-about .cap-card:nth-child(4) { border-left-color: var(--cyan-plan); }

.page-about .cap-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .28em;
  color: var(--text-faint);
  margin-bottom: .5rem;
}

.page-about .cap-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: .95rem;
}

.page-about .cap-detail {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows .34s var(--ease), opacity .3s var(--ease);
}

.page-about .cap-detail > div {
  overflow: hidden;
}

.page-about .cap-detail p {
  margin-top: .85rem;
  padding-top: .85rem;
  border-top: 1px solid var(--hair-soft);
  color: var(--text-dim);
  font-size: .9rem;
}

.page-about .cap-card:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .cap-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .cap-card:hover {
    transform: translateY(-4px);
    border-color: var(--hair);
  }
  .page-about .cap-card .cap-detail {
    grid-template-rows: 0fr;
    opacity: 0;
  }
  .page-about .cap-card:hover .cap-detail,
  .page-about .cap-card:focus-within .cap-detail,
  .page-about .cap-card:focus .cap-detail {
    grid-template-rows: 1fr;
    opacity: 1;
  }
}

@media (min-width: 900px) and (hover: none) {
  .page-about .cap-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 服务半径 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 4vw, 3.2rem);
  align-items: center;
}

.page-about .reach-body p {
  max-width: 60ch;
}

.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(.8rem, 2vw, 1.4rem);
  margin-top: clamp(1.4rem, 3vw, 2rem);
  padding-top: clamp(1.2rem, 2.4vw, 1.6rem);
  border-top: 1px solid var(--hair-soft);
}

.page-about .reach-stats .stat__value em {
  font-style: normal;
  font-size: .6em;
  color: var(--gold);
}

.page-about .net-frame {
  padding: clamp(1rem, 2.6vw, 1.8rem);
  border: 1px solid var(--line-glass);
  background:
    radial-gradient(120% 100% at 72% 18%, rgba(123, 95, 214, .22), rgba(10, 14, 42, 0) 62%),
    rgba(20, 26, 69, .5);
}

.page-about .net-map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .net-ring {
  fill: none;
  stroke: rgba(230, 234, 245, .13);
  stroke-width: 1;
}

.page-about .net-line {
  stroke: rgba(232, 179, 60, .3);
  stroke-width: 1;
}

.page-about .net-node { fill: var(--gold); }
.page-about .net-node--core { fill: var(--gold-soft); }
.page-about .net-node--cyan { fill: var(--cyan-stock); }
.page-about .net-node--nebula { fill: var(--nebula); }

.page-about .net-caption {
  font-size: .8rem;
  line-height: 1.8;
  color: var(--text-faint);
  margin: .9rem 0 0;
}

@media (min-width: 980px) {
  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

/* ---------- 现场积累 ---------- */
.page-about .field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 3.6vw, 3rem);
  align-items: start;
}

.page-about .field-media {
  --media-ratio: 1 / 1;
  border: 1px solid var(--hair-soft);
  margin: 0;
}

.page-about .env-list {
  list-style: none;
  margin: clamp(1.2rem, 2.6vw, 1.8rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair-soft);
  border-top: 1px solid var(--hair-soft);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .env-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: .35rem;
  padding: clamp(.9rem, 2vw, 1.15rem) clamp(.8rem, 2vw, 1.1rem);
  background: rgba(10, 14, 42, .82);
  border-left: 3px solid transparent;
}

.page-about .env-row--plateau { border-left-color: var(--white-custom); }
.page-about .env-row--sandy { border-left-color: var(--copper-mid); }
.page-about .env-row--humid { border-left-color: var(--cyan-stock); }
.page-about .env-row--plain { border-left-color: var(--gold-soft); }

.page-about .env-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .06em;
  color: var(--text);
}

.page-about .env-desc {
  font-size: .9rem;
  line-height: 1.85;
  color: var(--text-dim);
}

@media (min-width: 880px) {
  .page-about .field-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.3fr);
  }
  .page-about .env-row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 1.2rem;
    align-items: baseline;
  }
}

/* ---------- 团队分工 ---------- */
.page-about .team-head {
  max-width: 62ch;
  margin-bottom: clamp(1.6rem, 3vw, 2.4rem);
}

.page-about .duty-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2.4vw, 1.6rem);
}

.page-about .duty-item {
  padding: clamp(1.2rem, 2.6vw, 1.8rem);
  background: rgba(20, 26, 69, .55);
  border-top: 1px solid var(--hair);
  transition: background .34s var(--ease);
}

.page-about .duty-item:hover {
  background: rgba(20, 26, 69, .78);
}

.page-about .duty-idx {
  display: block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .3em;
  color: var(--gold);
  margin-bottom: .7rem;
}

.page-about .duty-item p {
  margin: 0;
  font-size: .93rem;
  max-width: 46ch;
}

@media (min-width: 900px) {
  .page-about .duty-list {
    grid-template-columns: 1.3fr 1fr 1fr;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-wrap {
  position: relative;
}

.page-about .timeline-wrap > .vnote {
  display: none;
}

.page-about .tl-head {
  margin-bottom: clamp(1.6rem, 3.4vw, 2.6rem);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: .4rem;
  padding: 0 0 clamp(2rem, 4.4vw, 3rem) 1.5rem;
  scroll-margin-top: 6rem;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(232, 179, 60, .4), rgba(232, 179, 60, .05));
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: -3px;
  top: .45em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(232, 179, 60, .12);
}

.page-about .tl-item:last-child::before {
  background: linear-gradient(180deg, rgba(232, 179, 60, .3), rgba(232, 179, 60, 0));
}

.page-about .tl-mark {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--gold);
  text-decoration: none;
  align-self: start;
  transition: color .25s var(--ease);
}

.page-about .tl-mark:hover,
.page-about .tl-mark:focus-visible {
  color: var(--gold-soft);
  outline: none;
}

.page-about .tl-mark:focus-visible {
  text-decoration: underline;
  text-underline-offset: .3em;
}

.page-about .tl-body h3 {
  margin-top: 0;
}

.page-about .tl-body p {
  max-width: 62ch;
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .tl-item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.4rem, 3.4vw, 3rem);
    padding-left: 0;
  }
  .page-about .tl-item::before {
    left: calc(var(--about-rail) - 1px);
    top: .7em;
  }
  .page-about .tl-item::after {
    left: calc(var(--about-rail) - 4px);
    top: .62em;
  }
  .page-about .tl-mark {
    text-align: left;
    padding-top: .1em;
  }
}

@media (min-width: 1180px) {
  .page-about .timeline-wrap {
    padding-left: 3.4rem;
  }
  .page-about .timeline-wrap > .vnote {
    display: inline-block;
    position: absolute;
    left: 0;
    top: 4.4rem;
  }
}

/* ---------- 收尾入口 ---------- */
.page-about .next-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 2.8vw, 2rem);
  align-items: center;
  padding: clamp(1.6rem, 3.4vw, 2.6rem);
  border: 1px solid var(--hair);
  background:
    radial-gradient(110% 130% at 88% 10%, rgba(232, 179, 60, .13), rgba(10, 14, 42, 0) 58%),
    rgba(20, 26, 69, .62);
}

.page-about .next-copy h2 {
  margin-top: 0;
}

.page-about .next-copy p {
  margin: 0;
  max-width: 58ch;
  font-size: .95rem;
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

@media (min-width: 940px) {
  .page-about .next-panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr);
  }
  .page-about .next-links {
    justify-content: flex-end;
  }
}

@media (max-width: 420px) {
  .page-about .next-links .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}