.page-about {
  --about-gap: clamp(2.5rem, 6vw, 5rem);
  --about-rule: 1px solid var(--line-grid);
  --about-dash: 1px dashed var(--line-grid);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2rem, 5vw, 3.5rem);
  border-bottom: var(--about-rule);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.page-about .about-hero__stamp {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--bright);
}
.page-about .about-hero .lede {
  margin: 1rem 0 0;
  max-width: 38em;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-grid);
  border: var(--about-rule);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-hero__facts > li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.95rem 1.05rem;
  background: var(--ink-panel);
}
.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .about-hero__unit {
  margin-left: 1px;
  font-size: 0.6em;
  color: var(--cyan);
}
.page-about .about-hero__facts > li > span:last-child {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 时间线刻度 ---------- */
.page-about .timeline-track {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-block: 1.5rem 2rem;
  padding-block: 1.1rem;
  border-top: var(--about-dash);
  border-bottom: var(--about-dash);
}
.page-about .timeline-tick {
  display: inline-block;
  padding: 0.32rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  border: var(--about-rule);
  border-radius: 999px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.page-about .timeline-tick:hover,
.page-about .timeline-tick:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background-color: rgba(91, 231, 214, 0.08);
  outline: none;
}

/* ---------- 时间线列表 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 2rem;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 55%, transparent);
}
.page-about .timeline__item {
  position: relative;
  padding-bottom: 2rem;
  scroll-margin-top: 5rem;
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-void);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 3px rgba(91, 231, 214, 0.12);
}
.page-about .timeline__year {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}
.page-about .timeline__body h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .timeline__body p {
  margin: 0;
  max-width: 42em;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 旁注 ---------- */
.page-about .about-note {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  margin-top: 1.75rem;
  padding: 1rem 1.15rem;
  background: var(--ink-float);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.page-about .about-note--wide {
  border-left-color: var(--violet);
}
.page-about .about-note__idx {
  padding-top: 0.18rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-about .about-note--wide .about-note__idx {
  color: var(--violet);
}
.page-about .about-note p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}
.page-about .about-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .about-note a:hover,
.page-about .about-note a:focus-visible {
  color: var(--orange);
}

/* ---------- 团队四宫格 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.75rem;
}
.page-about .team-cell {
  position: relative;
  padding: 1.2rem 1.1rem 1.1rem;
  background: var(--ink-panel);
  border: var(--about-rule);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.page-about .team-cell:hover,
.page-about .team-cell:focus-within {
  border-color: var(--cyan);
  background: var(--ink-float);
  transform: translateY(-2px);
}
.page-about .team-cell__idx {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--violet);
}
.page-about .team-cell__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .team-cell p {
  margin: 0 0 0.9rem;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--muted);
}
.page-about .team-cell__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ---------- 发布流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-grid);
  border: var(--about-rule);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: 1.15rem 1.1rem;
  background: var(--ink-panel);
}
.page-about .flow__num {
  padding-top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
.page-about .flow__body h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .flow__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 频率格 ---------- */
.page-about .cadence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin-top: 1.5rem;
}
.page-about .cadence-cell {
  padding: 1rem 1.1rem 1.05rem;
  background: var(--ink-float);
  border-radius: var(--radius);
  border: 1px solid transparent;
}
.page-about .cadence-cell__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}
.page-about .cadence-cell__num {
  display: block;
  margin: 0.45rem 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .cadence-cell p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.68;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */
.page-about .region-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 1.75rem;
}
.page-about .region-split__text p {
  margin: 0 0 1rem;
  max-width: 40em;
  font-size: 0.95rem;
  line-height: 1.82;
  color: var(--muted);
}
.page-about .region-split__contacts {
  margin: 1.25rem 0 1.5rem;
  padding-block: 0.9rem;
  border-top: var(--about-dash);
  border-bottom: var(--about-dash);
}
.page-about .region-split__contacts p {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .region-split__contacts p:last-child {
  margin-bottom: 0;
}
.page-about .region-split__key {
  min-width: 4.6em;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .region-split__figure {
  margin: 0;
}

/* ---------- 主张引用块 ---------- */
.page-about .about-quote {
  position: relative;
  margin: 1.75rem 0 2rem;
  padding: 1.5rem 1.25rem 1.5rem 1.75rem;
  border-left: 3px solid var(--orange);
  background: linear-gradient(90deg, rgba(255, 122, 61, 0.09), transparent 72%);
}
.page-about .about-quote p {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.34;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .about-quote cite {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

/* ---------- 原则网格 ---------- */
.page-about .principle-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .principle {
  padding: 1.15rem 1.1rem;
  background: var(--ink-panel);
  border: var(--about-rule);
  border-radius: var(--radius);
}
.page-about .principle h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--bright);
}
.page-about .principle p {
  margin: 0;
  font-size: 0.91rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 媒体 ---------- */
.page-about .about-timeline-figure,
.page-about .about-team-figure {
  margin: 1.5rem 0 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.6fr) minmax(220px, 1fr);
    align-items: end;
    gap: 2.25rem;
  }
  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .cadence-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .region-split {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
  .page-about .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.75fr) minmax(280px, 1fr);
    gap: 3rem;
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .timeline {
    padding-left: 2.6rem;
  }
  .page-about .timeline__item::before {
    left: -2.6rem;
  }
  .page-about .region-split {
    gap: 2.5rem;
  }
  .page-about .team-grid {
    gap: 1.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-cell,
  .page-about .timeline-tick {
    transition: none;
  }
  .page-about .team-cell:hover,
  .page-about .team-cell:focus-within {
    transform: none;
  }
}