.page-about {
  --about-radius: 2px;
  --about-ink-soft: rgba(246, 241, 228, .12);
}

.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 26px);
  padding-bottom: clamp(12px, 2vw, 18px);
}

.page-about .about-crumb .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-ink);
}

.page-about .about-crumb .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--muted-cyan);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--ink-pitch);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-crumb .breadcrumb a:hover,
.page-about .about-crumb .breadcrumb a:focus-visible {
  color: var(--signal-orange);
  border-bottom-color: var(--signal-orange);
  outline: none;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(38px, 6vw, 80px) clamp(44px, 7vw, 92px);
  background-image:
    linear-gradient(114deg, transparent 45%, rgba(33, 230, 193, .10) 45%, rgba(33, 230, 193, .10) 45.4%, transparent 45.4%),
    linear-gradient(114deg, transparent 62%, rgba(255, 122, 47, .10) 62%, rgba(255, 122, 47, .10) 62.3%, transparent 62.3%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -22%;
  width: min(560px, 62vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(33, 230, 193, .22), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--pulse-cyan), var(--signal-orange) 58%, var(--pulse-cyan));
  opacity: .85;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__lead .eyebrow {
  color: var(--pulse-cyan);
  letter-spacing: .26em;
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--cold-white);
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 36ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--muted-cyan);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-ink-soft);
  background: var(--about-ink-soft);
  align-self: start;
}

.page-about .about-hero__stats .stat {
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2vw, 20px);
  background: var(--panel-teal);
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
  color: var(--cold-white);
  letter-spacing: -.01em;
}

.page-about .about-hero__stats .about-unit {
  font-size: .6em;
  margin-left: 2px;
  color: var(--pulse-cyan);
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted-cyan);
}

.page-about .about-hero__stats .stat--accent .stat__value {
  color: var(--signal-orange);
}

/* ---------- 章节公共 ---------- */

.page-about .about-history,
.page-about .about-team,
.page-about .about-columns,
.page-about .about-cadence,
.page-about .about-partner {
  padding-block: clamp(44px, 7vw, 88px);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
  align-items: start;
}

.page-about .chapter-no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .26em;
  writing-mode: vertical-rl;
  color: var(--muted-cyan);
  padding-top: 6px;
}

.page-about .chapter-head__body h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink-pitch);
}

.page-about .chapter-head__body p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: clamp(14.5px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--slate-ink);
}

.page-about .section--ink .chapter-no {
  color: var(--pulse-cyan);
}

.page-about .section--ink .chapter-head__body h2 {
  color: var(--cold-white);
}

.page-about .section--ink .chapter-head__body p {
  color: var(--muted-cyan);
}

/* ---------- 发展历程 ---------- */

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

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

.page-about .about-year-axis::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 18px;
  left: 31px;
  width: 2px;
  background: linear-gradient(180deg, var(--pulse-cyan), var(--signal-orange));
  opacity: .42;
}

.page-about .about-year-axis__item {
  position: relative;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  padding-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-year-axis__item::after {
  content: "";
  position: absolute;
  left: 27px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cold-white);
  border: 2px solid var(--pulse-cyan);
  box-sizing: content-box;
}

.page-about .about-year-axis__meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-top: 26px;
}

.page-about .about-year-axis__year {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink-pitch);
  letter-spacing: .01em;
}

.page-about .about-year-axis__stage {
  writing-mode: vertical-rl;
  padding: 6px 0;
  font-size: 10.5px;
  letter-spacing: .3em;
  color: var(--slate-ink);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-year-axis__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.35;
  color: var(--ink-pitch);
}

.page-about .about-year-axis__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-ink);
}

.page-about .about-year-axis__more {
  margin-top: 10px;
  padding: 9px 12px;
  border-left: 3px solid var(--signal-orange);
  background: var(--amber-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-pitch);
  transition: max-height .38s var(--ease), opacity .28s var(--ease),
    margin-top .28s var(--ease), padding-top .28s var(--ease), padding-bottom .28s var(--ease);
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-year-axis__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
  }

  .page-about .about-year-axis__item:hover .about-year-axis__more,
  .page-about .about-year-axis__item:focus-within .about-year-axis__more {
    max-height: 12em;
    opacity: 1;
    margin-top: 10px;
    padding-top: 9px;
    padding-bottom: 9px;
  }
}

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

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 560px;
  object-fit: cover;
}

/* ---------- 团队与分工 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-team__card {
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .about-team__count {
  display: block;
  margin: 14px 0 6px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(34px, 5vw, 46px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ink-pitch);
  letter-spacing: -.02em;
}

.page-about .about-team__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.35;
  color: var(--ink-pitch);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate-ink);
}

.page-about .about-team__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

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

/* ---------- 栏目构成 ---------- */

.page-about .about-columns__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-columns__card {
  display: block;
  padding: clamp(18px, 2.4vw, 26px);
  text-decoration: none;
  color: inherit;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-columns__card:hover,
.page-about .about-columns__card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-paper-strong);
  outline: none;
}

.page-about .about-columns__card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.32;
  color: var(--ink-pitch);
}

.page-about .about-columns__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--slate-ink);
}

.page-about .about-columns__go {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--panel-teal);
  border-bottom: 1px solid var(--pulse-cyan);
  padding-bottom: 2px;
}

.page-about .about-columns__card:hover .about-columns__go,
.page-about .about-columns__card:focus-visible .about-columns__go {
  color: var(--signal-orange);
  border-bottom-color: var(--signal-orange);
}

.page-about .about-columns__card--a { border-top: 4px solid var(--pulse-cyan); }
.page-about .about-columns__card--b { border-top: 4px solid var(--signal-orange); }
.page-about .about-columns__card--c { border-top: 4px solid var(--amber-soft); }
.page-about .about-columns__card--d { border-top: 4px solid var(--muted-cyan); }

/* ---------- 生产节奏 ---------- */

.page-about .about-cadence__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 24px);
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cadence__list .timeline__item {
  padding: clamp(16px, 2.2vw, 22px) clamp(16px, 2.2vw, 22px);
  border-left: 3px solid var(--pulse-cyan);
  background: rgba(253, 253, 251, .05);
}

.page-about .about-cadence__list .timeline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
  color: var(--pulse-cyan);
}

.page-about .about-cadence__list .timeline__title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.35;
  color: var(--cold-white);
}

.page-about .about-cadence__list .timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted-cyan);
}

.page-about .about-cadence__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

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

/* ---------- 合作与投稿 ---------- */

.page-about .about-partner__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-partner__card {
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .about-partner__card h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.32;
  color: var(--ink-pitch);
}

.page-about .about-partner__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-ink);
}

.page-about .about-partner__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(24px, 3.4vw, 34px);
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  background: var(--cold-white);
}

.page-about .about-partner__cta p {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-ink);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-team__figure img {
    max-height: 420px;
  }
}

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

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

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

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

@media (min-width: 880px) {
  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-history__figure {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .9fr);
    align-items: end;
  }

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

  .page-about .about-columns__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .about-year-axis__item {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-year-axis::before {
    left: 25px;
  }

  .page-about .about-year-axis__item::after {
    left: 21px;
  }

  .page-about .about-year-axis__year {
    font-size: 12.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-columns__card,
  .page-about .about-year-axis__more {
    transition: none;
  }

  .page-about .about-columns__card:hover,
  .page-about .about-columns__card:focus-visible {
    transform: none;
  }
}