.page-about {
  --about-snap: linear-gradient(90deg, var(--blue), var(--mint));
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(110% 80% at 88% 0%, rgba(255, 106, 26, 0.12), transparent 62%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(28px, 5vw, 60px) 0 clamp(36px, 6vw, 80px);
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 40em;
  color: var(--muted);
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.8;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fact {
  margin: 0;
  padding: 16px 18px 18px;
  background: var(--ink);
  transition: background 0.25s var(--ease);
}

.page-about .fact:hover {
  background: var(--panel-2);
}

.page-about .fact__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--faint);
  text-transform: uppercase;
}

.page-about .fact__num {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.page-about .about-hero__media .figure__cap {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--faint);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }
  .page-about .about-hero__media img {
    aspect-ratio: 5 / 6;
  }
}

/* ---------- 通用章节文字 ---------- */
.page-about .about-lead {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-lead + .about-lead {
  margin-top: 14px;
}

.page-about .section__head--flush {
  margin-bottom: 0;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-timeline {
  border-bottom: 1px solid var(--line);
}

.page-about .tl {
  list-style: none;
  margin: clamp(28px, 4vw, 52px) 0 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 0 22px 18px;
  border-top: 1px solid var(--line);
}

.page-about .tl__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: var(--orange);
  opacity: 0.22;
  transition: opacity 0.25s var(--ease);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  opacity: 1;
}

.page-about .tl__mark {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .tl__dot {
  width: 7px;
  height: 7px;
  border: 1px solid var(--orange);
  border-radius: 50%;
  background: var(--ink);
  flex: none;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.12em;
  color: var(--orange-soft);
}

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

.page-about .tl__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 25px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .tl__text {
  margin: 10px 0 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .tl__keys {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .tl__keys li {
  padding: 4px 10px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .tl__item:hover .tl__keys li {
  color: var(--text);
  border-color: var(--orange-soft);
}

@media (min-width: 860px) {
  .page-about .tl__item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 0 2.5rem;
    padding: 30px 0;
  }
  .page-about .tl__item::before {
    top: 30px;
    bottom: 30px;
  }
  .page-about .tl__mark {
    display: block;
    padding-right: 1rem;
  }
  .page-about .tl__dot {
    position: absolute;
    left: calc(7.5rem - 4px);
    top: 34px;
    width: 8px;
    height: 8px;
    background: var(--ink);
  }
  .page-about .tl__item:hover .tl__dot {
    background: var(--orange);
  }
  .page-about .tl__year {
    display: block;
    font-size: 17px;
    padding-top: 2px;
  }
}

/* ---------- 02 团队条带 ---------- */
.page-about .about-team {
  border-bottom: 1px solid var(--line);
}

.page-about .team__strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team__cell {
  padding: 22px 20px 24px;
  background: var(--panel);
  transition: background 0.25s var(--ease);
}

.page-about .team__cell:hover {
  background: var(--orange-dim);
}

.page-about .team__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(36px, 6vw, 56px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .team__num em {
  font-style: normal;
  font-size: 0.5em;
  color: var(--orange-soft);
}

.page-about .team__label {
  display: block;
  margin-top: 12px;
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
}

.page-about .team__note {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.page-about .about-team__media {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .about-team__media .figure__cap {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--faint);
}

@media (min-width: 760px) {
  .page-about .team__strip {
    grid-template-columns: 1.25fr 1.05fr 1fr 1.2fr;
  }
}

/* ---------- 03 五个入口 ---------- */
.page-about .about-families {
  border-bottom: 1px solid var(--line);
}

.page-about .families__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .fam {
  --fam-c: var(--blue);
  position: relative;
  display: block;
  padding: 24px 20px 30px;
  background: var(--panel);
  text-decoration: none;
  color: var(--text);
  overflow: hidden;
  transition: background 0.25s var(--ease);
}

.page-about .fam::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--fam-c), var(--mint));
  transform: scaleX(0.16);
  transform-origin: left center;
  transition: transform 0.3s var(--ease);
}

.page-about .fam:hover,
.page-about .fam:focus-visible {
  background: var(--panel-2);
}

.page-about .fam:hover::before,
.page-about .fam:focus-visible::before {
  transform: scaleX(1);
}

.page-about .fam:nth-child(2) {
  --fam-c: var(--mint);
}
.page-about .fam:nth-child(3) {
  --fam-c: var(--blue);
}
.page-about .fam:nth-child(4) {
  --fam-c: var(--mint);
}
.page-about .fam:nth-child(5) {
  --fam-c: var(--blue);
}

.page-about .fam__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--fam-c);
}

.page-about .fam__name {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 23px);
  color: var(--text);
}

.page-about .fam__desc {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .fam__go {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .fam:hover .fam__go {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

@media (min-width: 700px) {
  .page-about .families__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .fam:first-child {
    grid-column: span 2;
  }
}

@media (min-width: 1060px) {
  .page-about .families__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .fam:first-child {
    grid-column: span 2;
  }
  .page-about .fam:nth-child(2) {
    grid-column: span 1;
  }
}

/* ---------- 04 数据标注 ---------- */
.page-about .about-data {
  border-bottom: 1px solid var(--line);
}

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-data__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-data__list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.7;
}

.page-about .about-data__list .mono {
  flex: none;
  min-width: 3.5rem;
  color: var(--mint);
  font-size: 12px;
}

.page-about .about-data__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-data__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-data__media .figure__cap {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--faint);
}

@media (min-width: 900px) {
  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-partners {
  border-bottom: 1px solid var(--line);
}

.page-about .partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .partners__card {
  padding: 24px 22px 26px;
  border-left: 2px solid var(--line);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .partners__card:hover {
  border-left-color: var(--orange);
  background: var(--panel-2);
}

.page-about .partners__card--honor {
  border-left-color: var(--orange-soft);
}

.page-about .partners__num {
  display: block;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .partners__name {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .partners__desc {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

@media (min-width: 820px) {
  .page-about .partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 06 内容合作 ---------- */
.page-about .about-join {
  border-bottom: 1px solid var(--line);
}

.page-about .join__panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 106, 26, 0.07), transparent 70%),
    var(--panel);
}

.page-about .join__steps {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  counter-reset: step;
}

.page-about .join__steps li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14.5px;
}

.page-about .join__steps .mono {
  color: var(--orange-soft);
  font-size: 12px;
}

.page-about .join__aside {
  align-self: start;
  padding: 20px;
  border-left: 2px solid var(--orange);
  background: rgba(10, 11, 14, 0.55);
}

.page-about .join__hint {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

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

.page-about .join__hint.mono {
  color: var(--text);
  font-size: 13px;
  word-break: break-all;
}

@media (min-width: 900px) {
  .page-about .join__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
  }
}

/* ---------- 路线索引 ---------- */
.page-about .routes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3vw, 36px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .route {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 18px 20px;
  background: var(--ink);
  text-decoration: none;
  color: var(--text);
  border-left: 2px solid transparent;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .route:hover,
.page-about .route:focus-visible {
  border-left-color: var(--orange);
  background: var(--panel);
}

.page-about .route__num {
  flex: none;
  font-size: 12px;
  color: var(--faint);
  padding-top: 3px;
  transition: color 0.22s var(--ease);
}

.page-about .route:hover .route__num {
  color: var(--orange);
}

.page-about .route__body {
  display: block;
  min-width: 0;
}

.page-about .route__name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
}

.page-about .route__desc {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

@media (min-width: 760px) {
  .page-about .routes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .fam::before,
  .page-about .tl__item::before,
  .page-about .route,
  .page-about .team__cell,
  .page-about .partners__card {
    transition: none;
  }
}