.page-about {
  --about-index: 200px;
  --about-rail-gap: clamp(14px, 2vw, 22px);
  --about-panel: rgba(238, 244, 236, 0.045);
  --about-panel-strong: rgba(238, 244, 236, 0.075);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(64px, 11vh, 118px) clamp(40px, 6vh, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 12% -20% -40% 34%;
  background:
    radial-gradient(circle at 42% 38%, rgba(201, 242, 77, 0.16), transparent 62%),
    radial-gradient(circle at 78% 72%, rgba(33, 230, 193, 0.12), transparent 58%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  width: 46%;
  background: repeating-linear-gradient(90deg, rgba(11, 61, 46, 0.5) 0 22px, rgba(11, 61, 46, 0.16) 22px 44px);
  opacity: 0.45;
  pointer-events: none;
  mask-image: linear-gradient(90deg, transparent, #000 45%);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 45%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: end;
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 68px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 14px 0 20px;
  color: var(--mist);
  max-width: 20ch;
}

.page-about .about-hero__text .lead {
  max-width: 56ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

/* 档案封签 */
.page-about .about-seal {
  position: relative;
  background: linear-gradient(158deg, rgba(11, 61, 46, 0.96), rgba(4, 21, 15, 0.96));
  border: 1px solid rgba(201, 242, 77, 0.32);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 30px);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.4);
  transform: rotate(-1.2deg);
  max-width: 480px;
}

.page-about .about-seal__stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--aqua);
  margin: 0 0 6px;
}

.page-about .about-seal__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px dashed rgba(238, 244, 236, 0.16);
}

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

.page-about .about-seal__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-seal__num--orange {
  color: var(--orange);
}

.page-about .about-seal__num--aqua {
  color: var(--aqua);
}

.page-about .about-seal__lab {
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
  text-align: right;
}

/* ---------- 档案主体骨架 ---------- */
.page-about .about-archive {
  padding-block: clamp(46px, 7vw, 92px);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 44px);
}

/* ---------- 左侧目录 ---------- */
.page-about .about-index {
  min-width: 0;
}

.page-about .about-index__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 12px;
}

.page-about .about-index__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  white-space: nowrap;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: var(--about-panel);
  color: var(--mist);
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-index__link:hover {
  border-color: rgba(201, 242, 77, 0.5);
  background: var(--about-panel-strong);
  transform: translateY(-2px);
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .about-index__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .about-index__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--aqua);
}

.page-about .about-index__name {
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 右列档案条目 ---------- */
.page-about .about-entries {
  min-width: 0;
}

.page-about .about-block {
  border-radius: var(--radius);
  padding: clamp(22px, 3.4vw, 42px);
  border: 1px solid var(--line-soft);
  background: var(--slate-900);
}

.page-about .about-block + .about-block {
  margin-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-block--slate {
  background: linear-gradient(168deg, var(--slate-700), var(--slate-900) 62%);
}

.page-about .about-block--turf {
  background: linear-gradient(164deg, var(--turf-700), var(--turf-900) 68%);
  border-color: rgba(201, 242, 77, 0.16);
}

.page-about .about-block--deep {
  background:
    radial-gradient(circle at 88% 4%, rgba(33, 230, 193, 0.12), transparent 52%),
    linear-gradient(170deg, #061a13, var(--turf-900));
  border-color: rgba(33, 230, 193, 0.18);
}

.page-about .about-block__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  margin-bottom: 14px;
}

.page-about .about-block__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--aqua);
  margin: 0;
}

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

.page-about .about-h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(23px, 3.1vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--mist);
  max-width: 30ch;
}

.page-about .about-p {
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.8;
  color: rgba(238, 244, 236, 0.82);
  margin: 0 0 8px;
  max-width: 68ch;
}

/* 发展脉络时间线 */
.page-about .about-era {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-era__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px 22px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 26px);
  color: var(--lime);
  letter-spacing: -0.01em;
}

.page-about .about-era__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(238, 244, 236, 0.78);
}

/* 数据底稿 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 26px 0;
}

.page-about .about-stats .stat {
  padding: 16px 18px;
  border-radius: 14px;
  background: var(--about-panel);
  border: 1px solid var(--line-soft);
}

.page-about .about-stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.1;
  color: var(--lime);
}

.page-about .about-stats .stat__value--orange {
  color: var(--orange);
}

.page-about .about-stats .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--steel);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  padding: 13px 16px;
  border-left: 2px solid rgba(33, 230, 193, 0.5);
  background: linear-gradient(90deg, rgba(33, 230, 193, 0.07), transparent 70%);
  border-radius: 0 12px 12px 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(238, 244, 236, 0.8);
}

.page-about .about-steps__key {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--aqua);
  padding-top: 2px;
}

/* 图片 */
.page-about .about-figure {
  margin: 26px 0 22px;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px;
  object-fit: cover;
}

.page-about .media__caption {
  font-size: 13px;
  line-height: 1.65;
}

/* 可展开档案条目 */
.page-about .dossier {
  border-top: 1px solid var(--line);
  padding: 4px 0;
}

.page-about .dossier:last-of-type {
  border-bottom: 1px solid var(--line);
}

.page-about .dossier__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 2px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(15px, 1.3vw, 17px);
  font-weight: 600;
  color: var(--mist);
  transition: color 180ms var(--ease);
}

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

.page-about .dossier__summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--aqua);
  transition: color 180ms var(--ease);
}

.page-about .dossier[open] .dossier__summary {
  color: var(--lime);
}

.page-about .dossier[open] .dossier__summary::after {
  content: "–";
  color: var(--lime);
}

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

.page-about .dossier__summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 8px;
}

.page-about .dossier__body {
  padding: 0 2px 18px;
}

.page-about .dossier__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
  max-width: 66ch;
}

/* 横向时间轴 */
.page-about .about-rail {
  display: flex;
  gap: var(--about-rail-gap);
  margin: 24px 0 8px;
  padding: 6px 4px 18px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 4px;
  border-radius: 12px;
}

.page-about .about-rail__item {
  flex: 0 0 min(300px, 76vw);
  scroll-snap-align: start;
  padding: 20px 20px 22px;
  border-radius: 16px;
  border: 1px solid rgba(238, 244, 236, 0.12);
  background: linear-gradient(180deg, rgba(238, 244, 236, 0.07), rgba(238, 244, 236, 0.02));
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-rail__item:hover {
  border-color: rgba(201, 242, 77, 0.42);
  transform: translateY(-3px);
}

.page-about .about-rail__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--aqua);
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

.page-about .about-rail__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(238, 244, 236, 0.78);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 24px 0 22px;
}

.page-about .about-team__panel {
  padding: 22px 20px;
  border-radius: 16px;
  border: 1px solid var(--line-soft);
  background: var(--about-panel);
}

.page-about .about-team__panel--accent {
  border-color: rgba(255, 122, 47, 0.42);
  background: linear-gradient(150deg, rgba(255, 122, 47, 0.14), rgba(255, 122, 47, 0.02));
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(38px, 6vw, 58px);
  line-height: 1;
  color: var(--mist);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.page-about .about-team__panel--accent .about-team__num {
  color: var(--orange);
}

.page-about .about-team__lab {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--steel);
}

/* 合作入口 */
.page-about .about-link-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--line-soft);
  background: var(--about-panel);
  text-decoration: none;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-link-card:hover {
  border-color: rgba(201, 242, 77, 0.5);
  background: var(--about-panel-strong);
  transform: translateY(-3px);
}

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

.page-about .about-link-card__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-link-card__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* 收尾 */
.page-about .about-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(24px, 3.4vw, 38px);
  border-radius: var(--radius);
  border: 1px solid rgba(201, 242, 77, 0.28);
  background:
    radial-gradient(circle at 8% 18%, rgba(201, 242, 77, 0.16), transparent 58%),
    linear-gradient(150deg, var(--turf-700), var(--turf-900));
}

.page-about .about-cta__lead {
  margin: 10px 0 0;
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.7;
  color: rgba(238, 244, 236, 0.86);
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-link-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-era__item {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(320px, 0.68fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-archive__grid {
    grid-template-columns: var(--about-index) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 64px);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 12px 0 12px 16px;
    transition: border-color 180ms var(--ease), color 180ms var(--ease);
  }

  .page-about .about-index__link:hover {
    background: transparent;
    transform: none;
    border-left-color: var(--lime);
  }

  .page-about .about-index__name {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-rail__item,
  .page-about .about-link-card,
  .page-about .dossier__summary {
    transition: none;
  }

  .page-about .about-seal {
    transform: none;
  }
}