.page-about {
  --about-pad: clamp(2.5rem, 7vw, 5rem);
  --about-cut: 22px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: end;
}

.page-about .about-hero__intro h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.35rem, 8.5vw, 4.6rem);
  line-height: .98;
  letter-spacing: -.01em;
  margin: .4rem 0 0;
  max-width: 16ch;
}

.page-about .about-hero__intro .lede {
  max-width: 48ch;
  margin: 1.15rem 0 0;
  line-height: 1.75;
  color: var(--paper);
  opacity: .92;
}

.page-about .about-hero__fig {
  margin: 0;
  border: 1px solid var(--steel);
  background: var(--ink-800);
  position: relative;
}

.page-about .about-hero__fig::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 72px;
  height: 4px;
  background: var(--orange);
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
  .page-about .about-hero__intro {
    padding-bottom: .6rem;
  }
}

/* ---------- 记分牌数字条 ---------- */
.page-about .about-stats {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .about-stats__cell {
  background: var(--ink-800);
  padding: 1rem 1.05rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.5vw, 2rem);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stats__label {
  font-size: .82rem;
  line-height: 1.5;
  color: var(--mist);
}

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

/* ---------- 章节快捷入口 ---------- */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin-top: 1.4rem;
}

.page-about .about-jump__link {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--steel);
  padding: .36rem .72rem;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--ink-900);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: var(--about-pad) 0;
  border-bottom: var(--line);
  position: relative;
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
}

.page-about .about-sec__body {
  display: grid;
  gap: 1rem;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: .8rem;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-sec__body {
    grid-template-columns: minmax(0, .3fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 5vw, 4rem);
  }
  .page-about .about-sec__head {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
    position: sticky;
    top: 2.5rem;
  }
}

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

.page-about .about-sec__main > h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  line-height: 1.06;
  letter-spacing: -.005em;
  margin: 0 0 .95rem;
}

.page-about .about-sec__main > p {
  max-width: 62ch;
  line-height: 1.75;
  margin: 0 0 .95rem;
}

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

.page-about .about-note {
  border-left: 2px solid var(--lime);
  padding: .2rem 0 .2rem 1rem;
  color: var(--mist);
  font-size: .92rem;
}

.page-about .about-sec__main a:not(.btn) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 214, 196, .45);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-sec__main a:not(.btn):hover,
.page-about .about-sec__main a:not(.btn):focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 更新节奏三步 ---------- */
.page-about .flow {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .flow__item {
  background: var(--ink-900);
  padding: 1.15rem 1.15rem 1.35rem;
  border-top: 2px solid transparent;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .flow__item:hover {
  border-top-color: var(--lime);
  background: var(--ink-700);
}

.page-about .flow__time {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .73rem;
  letter-spacing: .08em;
  color: var(--orange);
  margin-bottom: .5rem;
}

.page-about .flow__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 .4rem;
}

.page-about .flow__desc {
  font-size: .87rem;
  line-height: 1.7;
  color: var(--mist);
  margin: 0;
}

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

/* ---------- 插图 ---------- */
.page-about .about-fig {
  margin: clamp(1.6rem, 4vw, 2.35rem) 0 0;
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--steel);
  filter: saturate(.85) contrast(1.05);
}

.page-about .about-fig .figure__cap {
  margin-top: .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  color: var(--mist);
  line-height: 1.6;
}

/* ---------- 团队分工 ---------- */
.page-about .team {
  margin-top: 1.75rem;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .team__card {
  position: relative;
  background: var(--ink-900);
  padding: 1.25rem 1.15rem 1.45rem;
  min-width: 0;
  transition: background-color .2s var(--ease);
}

.page-about .team__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width .22s var(--ease);
}

.page-about .team__card:hover {
  background: var(--ink-800);
}

.page-about .team__card:hover::before {
  width: 100%;
}

.page-about .team__idx {
  display: block;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--steel);
  margin-bottom: .7rem;
}

.page-about .team__name {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 .45rem;
  color: var(--paper);
}

.page-about .team__desc {
  font-size: .87rem;
  line-height: 1.7;
  color: var(--mist);
  margin: 0;
}

@media (min-width: 640px) {
  .page-about .team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 发展时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0 0 0 1.85rem;
  border-left: 1px solid var(--steel);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 clamp(1.5rem, 4vw, 2.2rem);
  min-width: 0;
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1.85rem - 5px);
  top: .38rem;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 2px solid var(--steel);
  transform: rotate(45deg);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .tl__item:hover::before {
  border-color: var(--lime);
  background: var(--lime);
}

.page-about .tl__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .86rem;
  letter-spacing: .1em;
  color: var(--orange);
  margin-bottom: .35rem;
  transition: color .2s var(--ease);
}

.page-about .tl__item:hover .tl__year {
  color: var(--lime);
}

.page-about .tl__title {
  font-size: 1.02rem;
  font-weight: 700;
  margin: 0 0 .35rem;
}

.page-about .tl__desc {
  font-size: .89rem;
  line-height: 1.72;
  color: var(--mist);
  margin: 0;
  max-width: 58ch;
}

@media (min-width: 900px) {
  .page-about .tl {
    padding-left: 2.2rem;
  }
  .page-about .tl__item::before {
    left: calc(-2.2rem - 5px);
  }
}

/* ---------- 内容协作 ---------- */
.page-about .collab {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

.page-about .collab__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem;
  align-items: start;
  padding: .95rem 1rem;
  background: var(--ink-800);
  border-left: 2px solid var(--steel);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .collab__item:hover {
  border-left-color: var(--lime);
  background: var(--ink-700);
}

.page-about .collab__idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--lime);
  padding-top: .18rem;
}

.page-about .collab__title {
  font-size: .96rem;
  font-weight: 700;
  margin: 0 0 .3rem;
}

.page-about .collab__desc {
  font-size: .86rem;
  line-height: 1.7;
  color: var(--mist);
  margin: 0;
}

.page-about .collab__desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 214, 196, .45);
}

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

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin: clamp(2.2rem, 6vw, 3.5rem) 0 0;
  padding: clamp(2rem, 5vw, 3.25rem) clamp(1.25rem, 4vw, 3rem);
  background: linear-gradient(135deg, var(--ink-800) 0%, var(--ink-700) 100%);
  border: 1px solid var(--steel);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 68px;
  height: 68px;
  background: linear-gradient(225deg, var(--orange) 0 50%, transparent 50%);
  opacity: .9;
  pointer-events: none;
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.6vw, 2.2rem);
  line-height: 1.08;
  margin: 0 0 .85rem;
  max-width: 20ch;
}

.page-about .about-cta p {
  max-width: 60ch;
  line-height: 1.75;
  color: var(--mist);
  margin: 0 0 1.5rem;
}

.page-about .about-cta p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 214, 196, .45);
}

.page-about .about-cta p a:hover,
.page-about .about-cta p a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

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

.page-about .about-cta .btn {
  text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__link,
  .page-about .flow__item,
  .page-about .team__card,
  .page-about .team__card::before,
  .page-about .tl__item::before,
  .page-about .tl__year,
  .page-about .collab__item {
    transition-duration: .01ms;
  }
}