.page-about {
  --about-measure: 66ch;
  display: block;
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
  padding-block: clamp(26px, 4vw, 52px) clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(40px, 6.6vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-hero-lead {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.84;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero-meta .index-tag {
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--cyan);
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
}

.page-about .about-hero-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.page-about .about-hero-visual svg {
  width: 100%;
  max-width: 300px;
  height: auto;
  display: block;
}

.page-about .about-hero-caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(36px, 5vw, 68px);
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-section {
  padding-block: clamp(40px, 6vw, 80px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section-head {
  margin-bottom: clamp(22px, 3.5vw, 38px);
}

.page-about .about-h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 4.2vw, 48px);
  line-height: 1.06;
  letter-spacing: -0.016em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-prose {
  max-width: var(--about-measure);
}

.page-about .about-prose p {
  margin: 0 0 1.1em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-lead {
  max-width: 62ch;
}

.page-about .about-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--magenta);
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: var(--mist);
  max-width: 58ch;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-link {
  display: inline-block;
  font-size: var(--fs-small);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 206, 0.35);
  padding-bottom: 2px;
  transition: border-color 220ms ease, color 220ms ease;
}

.page-about .about-link:hover {
  border-color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .about-team-copy .lead {
  margin-top: 0;
}

.page-about .about-roles {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-role {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-role-title {
  margin: 8px 0 6px;
  font-size: var(--fs-h4);
  font-weight: 500;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-about .about-role-text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-band {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .about-timeline {
  --tl-pad: clamp(24px, 3.5vw, 42px);
  --tl-line: 5px;
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--tl-line);
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 22%, var(--line) 100%);
}

.page-about .about-tl-item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-line) - var(--tl-pad));
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--deep);
  border: 1px solid var(--cyan);
  transform: translateX(-50%);
  transition: background 320ms ease, box-shadow 320ms ease;
}

.page-about .about-tl-item:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 206, 0.14);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-tl-title {
  margin: 0 0 8px;
  font-size: var(--fs-h4);
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: 58ch;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-flow {
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: var(--panel-deep);
  padding: clamp(18px, 3vw, 28px);
}

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

.page-about .about-flow-caption {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--panel);
  padding: 16px 14px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 9px;
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 区域与线路 ---------- */
.page-about .about-region {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-region-media {
  margin: 0;
}

.page-about .about-metrics {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.page-about .about-metric-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric-unit {
  margin-left: 4px;
  font-size: 0.4em;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-metric-label {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-close .about-close-text {
  max-width: 60ch;
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.82;
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  display: none;
}

.page-about .about-rail-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.24em;
  color: var(--mist);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
  counter-reset: none;
}

.page-about .about-rail-link {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  transition: color 220ms ease, transform 220ms ease;
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link[aria-current="true"] {
  color: var(--cyan);
  transform: translateX(3px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    border-top: 0;
  }

  .page-about .about-role {
    padding: 18px 16px;
    border: 1px solid var(--line);
    border-radius: var(--r-m);
    background: var(--panel);
    transition: border-color 240ms ease, transform 240ms ease;
  }

  .page-about .about-role:hover {
    border-color: var(--cyan);
    transform: translateY(-3px);
  }

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

@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(220px, 0.7fr);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-data-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 172px;
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-bar) + 36px);
    align-self: start;
    padding-left: 20px;
    border-left: 1px solid var(--line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-tl-item::before,
  .page-about .about-rail-link,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-rail-link:hover {
    transform: none;
  }
}