.page-about {
  --about-rail: 104px;
  --about-gap: 16px;
  position: relative;
  overflow-x: clip;
}

/* ---------- 首屏声明 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4.5vw, 56px) 0 clamp(32px, 6vw, 72px);
  background: linear-gradient(180deg, var(--night) 0%, var(--strata) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero-lead .display-title {
  margin: 12px 0 18px;
  color: var(--star);
}

.page-about .about-hero-lead .lede {
  max-width: 640px;
  color: var(--thin);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-note-vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.26em;
  font-size: 12px;
  line-height: 1;
  color: var(--thin);
  margin: 0 0 14px;
  padding-left: 8px;
  border-left: 1px solid var(--line);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero-stats li {
  background: var(--night);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero-stats .stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--star);
}

.page-about .about-hero-stats li:nth-child(2) .stat-value {
  color: var(--observe);
}

.page-about .about-hero-stats .stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--thin);
}

/* ---------- 观测方法 ---------- */
.page-about .about-method {
  background: var(--night);
}

.page-about .about-method-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-method-card {
  background: var(--strata);
  padding: 22px 20px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-method-card:hover {
  background: var(--mist);
  box-shadow: inset 0 0 0 1px var(--observe);
}

.page-about .about-method-card .status-dot {
  margin-bottom: 2px;
}

.page-about .about-method-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--star);
}

.page-about .about-method-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--thin);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--strata);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team-chart {
  background: var(--night);
  border: 1px solid var(--line);
  padding: 22px 20px 18px;
}

.page-about .about-team-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-team-caption {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--thin);
}

.page-about .about-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-role {
  font-size: 16px;
  font-weight: 700;
  color: var(--star);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  color: var(--observe);
}

.page-about .about-team-desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.7;
  color: var(--thin);
}

.page-about .about-team-shift {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 14px 18px;
  border-left: 2px solid var(--observe);
  background: var(--mist);
  font-size: 14px;
  line-height: 1.7;
  color: var(--star);
}

.page-about .about-team-shift .status-dot {
  margin-top: 7px;
  flex: none;
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline {
  background: var(--night);
}

.page-about .about-timeline-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
}

.page-about .about-timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline-item {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  gap: var(--about-gap);
  padding: 22px 0 24px;
  border-bottom: 1px solid var(--line);
  position: relative;
  transition: background-color 0.25s ease;
}

.page-about .about-timeline-item::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--about-rail);
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4.6vw, 46px);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--mist);
  transition: color 0.25s ease;
}

.page-about .about-timeline-item:hover .about-timeline-num,
.page-about .about-timeline-item.is-visible .about-timeline-num {
  color: var(--observe);
}

.page-about .about-timeline-body {
  padding-left: calc(var(--about-gap));
  min-width: 0;
}

.page-about .about-timeline-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--star);
}

.page-about .about-timeline-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--thin);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--strata);
}

.page-about .about-partners-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

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

.page-about .about-partners-body .section-title {
  margin: 10px 0 14px;
}

.page-about .about-partners-body > p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--thin);
  max-width: 640px;
}

.page-about .about-board {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-board-row {
  background: var(--night);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  transition: background-color 0.25s ease;
}

.page-about .about-board-row:hover {
  background: var(--mist);
}

.page-about .about-board-key {
  font-size: 14px;
  color: var(--thin);
  min-width: 0;
}

.page-about .about-board-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  letter-spacing: -0.02em;
  color: var(--star);
  white-space: nowrap;
}

.page-about .about-partners-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--thin);
  padding-left: 14px;
  border-left: 2px solid var(--green);
}

/* ---------- 资质与认可 ---------- */
.page-about .about-recognition {
  background: var(--night);
}

.page-about .about-recognition-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-recognition-card {
  background: var(--strata);
  padding: 24px 20px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.25s ease;
}

.page-about .about-recognition-card:hover {
  box-shadow: inset 0 0 0 1px var(--observe);
}

.page-about .about-recognition-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--star);
}

.page-about .about-recognition-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--thin);
}

.page-about .about-recognition-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-recognition-list li {
  font-size: 14px;
  color: var(--thin);
  padding-left: 16px;
  position: relative;
}

.page-about .about-recognition-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--observe);
}

.page-about .about-recognition-metrics {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .about-recognition-metrics div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-recognition-metrics dt {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--thin);
}

.page-about .about-recognition-metrics dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  color: var(--star);
  letter-spacing: -0.02em;
}

/* ---------- 长期合作理由 ---------- */
.page-about .about-why {
  background: linear-gradient(180deg, var(--strata) 0%, var(--deep) 100%);
  border-top: 1px solid var(--line);
}

.page-about .about-why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-why-item {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-why-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--observe);
}

.page-about .about-why-item h3 {
  margin: 10px 0 10px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--star);
}

.page-about .about-why-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--thin);
}

.page-about .about-why-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about {
    --about-rail: 124px;
    --about-gap: 24px;
  }

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

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

  .page-about .about-recognition-card:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(230px, 0.85fr);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

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

@media (min-width: 1080px) {
  .page-about {
    --about-rail: 152px;
  }

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

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

  .page-about .about-recognition-card:last-child {
    grid-column: auto;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-method-card,
  .page-about .about-timeline-item,
  .page-about .about-timeline-num,
  .page-about .about-board-row,
  .page-about .about-recognition-card {
    transition: none;
  }
}
</main>