.page-about {
  --about-dot: 13px;
  --about-pad: 54px;
  --about-block: 48px;
  padding-bottom: 64px;
}

@media (min-width: 860px) {
  .page-about {
    --about-dot: 22px;
    --about-pad: 92px;
    --about-block: 84px;
    padding-bottom: 96px;
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 44px;
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 46px 0 72px;
  }
}

.page-about .about-hero .ht-h1 {
  margin: 14px 0 0;
  max-width: 21ch;
  font-size: clamp(29px, 5.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ht-white);
}

.page-about .about-hero .ht-lede {
  margin: 20px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ht-white);
  opacity: 0.76;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--ht-line);
  background: var(--ht-line);
}

.page-about .about-hero__stat {
  background: var(--ht-ink);
  padding: 16px 12px 18px;
}

@media (min-width: 700px) {
  .page-about .about-hero__stat {
    padding: 20px 20px 22px;
  }
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--ht-mono);
  font-size: clamp(22px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ht-lime);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-hero__num span {
  font-size: 0.44em;
  margin-left: 4px;
  letter-spacing: 0;
  color: var(--ht-muted);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ht-muted);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding: var(--about-block) 0;
  border-top: 1px solid var(--ht-line);
}

.page-about .about-sec .ht-h2 {
  margin: 12px 0 0;
  max-width: 24ch;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--ht-white);
}

.page-about .about-split {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-split--source {
    grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr);
  }
}

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

.page-about .ht-figure__media {
  display: block;
  overflow: hidden;
  background: var(--ht-ink-2);
  border: 1px solid var(--ht-line);
  clip-path: var(--ht-notch-sm);
}

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

.page-about .ht-figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ht-muted);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__body p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ht-white);
  opacity: 0.78;
  max-width: 62ch;
}

.page-about .about-quote {
  margin: 26px 0;
  padding: 6px 0 6px 20px;
  border-left: 3px solid var(--ht-orange);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.6;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ht-white);
  max-width: 30ch;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ht-muted);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 36px;
}

.page-about .about-jump__link {
  font-family: var(--ht-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  padding: 6px 12px 5px;
  color: var(--ht-muted);
  text-decoration: none;
  border: 1px solid var(--ht-line);
  transition: color var(--ht-ease), background-color var(--ht-ease), border-color var(--ht-ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--ht-ink);
  background-color: var(--ht-lime);
  border-color: var(--ht-lime);
}

.page-about .about-track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: var(--about-dot);
  top: 8px;
  bottom: 40px;
  width: 2px;
  transform: translateX(-1px);
  background: linear-gradient(180deg, var(--ht-lime) 0%, var(--ht-cyan) 26%, var(--ht-line) 64%, rgba(36, 52, 75, 0) 100%);
  opacity: 0.85;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 40px var(--about-pad);
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: var(--about-dot);
  top: 8px;
  width: 11px;
  height: 11px;
  margin-left: -5.5px;
  border-radius: 50%;
  background: var(--ht-ink);
  border: 2px solid var(--ht-lime);
  box-shadow: 0 0 0 4px rgba(198, 245, 60, 0.08);
  transition: box-shadow var(--ht-ease), border-color var(--ht-ease), background-color var(--ht-ease);
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  background: var(--ht-lime);
  box-shadow: 0 0 0 7px rgba(198, 245, 60, 0.16);
}

.page-about .about-track__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--ht-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ht-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-track__card {
  background: var(--ht-panel);
  border: 1px solid var(--ht-line);
  clip-path: var(--ht-notch-sm);
  padding: 20px 20px 18px;
  transition: border-color var(--ht-ease), transform var(--ht-ease), background-color var(--ht-ease);
}

.page-about .about-track__card:hover,
.page-about .about-track__card:focus-within {
  border-color: var(--ht-lime);
  background: #17232F;
  transform: translateX(2px);
}

.page-about .about-track__title {
  margin: 0;
  font-size: clamp(18px, 2.2vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--ht-white);
}

.page-about .about-track__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ht-white);
  opacity: 0.72;
  max-width: 58ch;
}

.page-about .about-track__figure {
  margin: 18px 0 4px;
}

/* ---------- 折叠面板 ---------- */
.page-about .ht-fold {
  margin-top: 16px;
  border-top: 1px solid var(--ht-line);
}

.page-about .ht-fold__head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 12px 0 0;
  list-style: none;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ht-cyan);
  transition: color var(--ht-ease);
}

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

.page-about .ht-fold__head::before {
  content: "+";
  flex: 0 0 auto;
  width: 14px;
  font-family: var(--ht-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--ht-lime);
}

.page-about .ht-fold[open] .ht-fold__head::before {
  content: "\2212";
  color: var(--ht-orange);
}

.page-about .ht-fold__head:hover {
  color: var(--ht-white);
}

.page-about .ht-fold__body {
  padding: 12px 0 2px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ht-muted);
  max-width: 60ch;
}

.page-about .ht-fold__body p {
  margin: 0;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .ht-fold[open] .ht-fold__body {
    animation: about-fold-in 180ms cubic-bezier(0.32, 0.72, 0.28, 1);
  }
}

@keyframes about-fold-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__lede {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ht-muted);
}

.page-about .about-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ht-line);
  border: 1px solid var(--ht-line);
}

.page-about .about-crew__item {
  background: var(--ht-panel);
  padding: 20px 20px 22px;
  transition: background-color var(--ht-ease);
}

.page-about .about-crew__item:hover,
.page-about .about-crew__item:focus-within {
  background: #17232F;
}

.page-about .about-crew__num {
  display: block;
  font-family: var(--ht-mono);
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ht-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-crew__role {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--ht-white);
}

.page-about .about-crew__item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--ht-muted);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ht-muted);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: about-flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: 18px 0 18px 52px;
  border-bottom: 1px solid var(--ht-line);
}

.page-about .about-flow__step:first-child {
  border-top: 1px solid var(--ht-line);
}

.page-about .about-flow__idx {
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--ht-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ht-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow__step h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ht-white);
}

.page-about .about-flow__step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--ht-muted);
  max-width: 56ch;
}

.page-about .about-flow__step:hover .about-flow__idx {
  color: var(--ht-orange);
}

.page-about .about-source__side {
  display: grid;
  gap: 16px;
}

.page-about .about-source__card {
  background: var(--ht-panel);
  border: 1px solid var(--ht-line);
  padding: 20px 20px 22px;
  transition: border-color var(--ht-ease);
}

.page-about .about-source__card:hover,
.page-about .about-source__card:focus-within {
  border-color: var(--ht-cyan);
}

.page-about .about-source__card .ht-panel__kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ht-muted);
}

.page-about .about-source__big {
  margin: 12px 0 0;
  font-family: var(--ht-mono);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--ht-lime);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .about-source__big span {
  font-size: 0.38em;
  margin-left: 6px;
  letter-spacing: 0;
  color: var(--ht-white);
  opacity: 0.7;
}

.page-about .about-source__note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ht-muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach__lede {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ht-muted);
}

.page-about .about-map {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ht-line);
  border: 1px solid var(--ht-line);
}

@media (min-width: 760px) {
  .page-about .about-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-map__cell {
  background: var(--ht-ink-2);
  padding: 18px 16px 20px;
  min-height: 96px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  transition: background-color var(--ht-ease), box-shadow var(--ht-ease);
}

.page-about .about-map__cell:hover,
.page-about .about-map__cell:focus-within {
  background: var(--ht-panel);
  box-shadow: inset 0 0 0 2px var(--ht-cyan);
}

.page-about .about-map__cell--core {
  background: var(--ht-panel);
  box-shadow: inset 0 0 0 2px var(--ht-lime);
}

.page-about .about-map__cell--core:hover,
.page-about .about-map__cell--core:focus-within {
  box-shadow: inset 0 0 0 2px var(--ht-lime);
}

.page-about .about-map__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ht-white);
}

.page-about .about-map__cell--core .about-map__name {
  color: var(--ht-lime);
}

.page-about .about-map__cell--far .about-map__name {
  color: var(--ht-cyan);
}

.page-about .about-map__meta {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--ht-muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-next__inner {
  display: grid;
  gap: 24px;
}

@media (min-width: 860px) {
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }
}

.page-about .about-next__text p {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ht-muted);
}

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

@media (min-width: 860px) {
  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}