.page-about {
  --about-dot-morning: var(--cyan);
  --about-dot-afternoon: var(--gold-bright);
  --about-dot-night: var(--violet);
  --about-dot-late: var(--orange);
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(76px, 13vw, 128px) 0 clamp(30px, 5vw, 52px);
  background:
    radial-gradient(880px 360px at 10% -12%, rgba(79, 227, 210, .10), transparent 62%),
    radial-gradient(680px 300px at 92% -4%, rgba(154, 107, 255, .09), transparent 60%);
}

.page-about .about-hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.6vw, 56px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--paper);
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-hero-lede {
  margin-top: 20px;
  max-width: 38em;
}

.page-about .about-hero-lede .brand-inline,
.page-about .about-hero-lede strong {
  color: var(--gold-bright);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(30px, 5vw, 48px);
  background: var(--line-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-fact {
  background: var(--ink-900);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(19px, 3.2vw, 27px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.page-about .about-fact-cap {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 通用双栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-body-text {
  margin-top: 16px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 38em;
}

.page-about .about-body-text a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* ---------- 改版 ---------- */

.page-about .revision-card {
  padding: 20px 18px 22px;
}

.page-about .revision-card .panel-title {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--paper);
  margin: 0;
}

.page-about .slot-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .slot-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  color: var(--paper);
  letter-spacing: .01em;
}

.page-about .slot-item::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--dot, var(--gold));
  box-shadow: 0 0 10px var(--dot, var(--gold));
  transform: translateY(-1px);
}

.page-about .slot-item--morning { --dot: var(--cyan); }
.page-about .slot-item--afternoon { --dot: var(--gold-bright); }
.page-about .slot-item--night { --dot: var(--violet); }
.page-about .slot-item--late { --dot: var(--orange); }

.page-about .slot-time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.page-about .revision-note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .revision-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 三块内容 ---------- */

.page-about .pillar-stack {
  display: grid;
  gap: clamp(22px, 3vw, 30px);
}

.page-about .pillar {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .pillar::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 56px;
  height: 1px;
  background: var(--gold);
}

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

.page-about .pillar-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .pillar-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(19px, 2.4vw, 22px);
  color: var(--paper);
  margin: 0;
}

.page-about .pillar-text {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 40em;
}

.page-about .pillar-facts {
  list-style: none;
  margin: 13px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper);
}

.page-about .pillar-facts li {
  position: relative;
  padding-left: 18px;
}

.page-about .pillar-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

.page-about .pillar-facts .num {
  color: var(--gold-bright);
}

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

/* ---------- 团队 ---------- */

.page-about .shift-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.page-about .shift {
  padding: 14px 14px 16px;
  background: var(--ink-800);
  border-top: 2px solid var(--dot, var(--gold));
}

.page-about .shift--morning { --dot: var(--cyan); }
.page-about .shift--afternoon { --dot: var(--gold-bright); }
.page-about .shift--night { --dot: var(--violet); }
.page-about .shift--late { --dot: var(--orange); }

.page-about .shift-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--dot, var(--muted));
  font-variant-numeric: tabular-nums;
}

.page-about .shift-name {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--paper);
  margin: 7px 0 8px;
}

.page-about .shift-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: var(--muted);
}

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

/* ---------- 时间轴 ---------- */

.page-about .year-ruler {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
  padding: 0;
}

.page-about .year-tick {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  padding: 6px 12px;
  color: var(--muted);
  border: 1px solid var(--line-soft);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .year-tick:hover,
.page-about .year-tick:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline {
  counter-reset: tl;
  position: relative;
  padding-left: 30px;
  display: grid;
  gap: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 18px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--gold) 0%,
    rgba(79, 227, 210, .5) 52%,
    rgba(154, 107, 255, .4) 78%,
    transparent 100%);
}

.page-about .tl-node {
  counter-increment: tl;
  position: relative;
  border-top: 1px solid var(--line-soft);
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: -27px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--gold);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-node[open]::after {
  background: var(--gold-bright);
  box-shadow: 0 0 12px rgba(232, 207, 122, .7);
}

.page-about .tl-summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 0 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .tl-year {
  flex: none;
  min-width: 3.6em;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(16.5px, 2.2vw, 20px);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl-cue {
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-cue::before { content: "展开 +"; }
.page-about .tl-node[open] .tl-cue::before { content: "收起 −"; }

.page-about .tl-summary:hover .tl-cue { color: var(--cyan); }

.page-about .tl-detail {
  margin: 0;
  padding: 0 0 24px;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .tl-detail p + p { margin-top: 10px; }

.page-about .tl-detail a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 覆盖与合作 ---------- */

.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

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

.page-about .reach-body .lede {
  max-width: 34em;
}

.page-about .reach-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .reach-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  padding: 17px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .reach-val {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .reach-key {
  align-self: end;
  font-family: var(--font-serif);
  font-size: 16.5px;
  color: var(--paper);
}

.page-about .reach-note {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 反馈收束 ---------- */

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding: clamp(26px, 4vw, 46px);
  border: 1px solid var(--line);
  background:
    radial-gradient(640px 280px at 16% 0%, rgba(255, 138, 61, .13), transparent 64%),
    radial-gradient(520px 240px at 100% 100%, rgba(79, 227, 210, .09), transparent 62%),
    var(--ink-800);
}

.page-about .about-cta .section-title {
  max-width: 18em;
}

.page-about .about-cta .about-body-text {
  color: var(--paper);
  opacity: .86;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-cta-actions .btn {
  flex: 1 1 auto;
  min-width: 140px;
  justify-content: center;
  text-align: center;
}

.page-about .about-path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-path .path-label {
  color: var(--muted);
}

.page-about .about-path .path-link {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-path .path-link:hover,
.page-about .about-path .path-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-path .path-arrow {
  color: var(--gold);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-fact {
    padding: 20px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(38px, 5vw, 68px);
  }

  .page-about .about-team .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(36px, 5vw, 64px);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-cta-actions {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .page-about .about-cta-actions .btn {
    flex: 0 0 auto;
    width: 100%;
  }
}

@media (min-width: 1100px) {
  .page-about .timeline {
    padding-left: 38px;
  }

  .page-about .tl-node::after {
    left: -35px;
  }

  .page-about .timeline::before {
    left: 9px;
  }
}

@media (max-width: 480px) {
  .page-about .slot-time {
    display: block;
    margin-left: 0;
    padding-left: 18px;
  }

  .page-about .tl-summary {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  .page-about .tl-cue {
    margin-left: 0;
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-tick,
  .page-about .tl-node::after,
  .page-about .tl-cue,
  .page-about .about-path .path-link {
    transition: none;
  }
}