.page-about {
  --about-measure: 34em;
  --about-gap: clamp(24px, 4vw, 48px);
  background: var(--color-paper);
  color: var(--color-ink);
  overflow-x: clip;
}

.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 28px;
  padding-bottom: 4px;
}

.page-about .about-topbar .sec-label {
  margin: 0;
  color: var(--color-danxia);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 20px;
  padding-bottom: 56px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-danxia);
}

.page-about .about-h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 8vw, 5.2rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-about .about-h1-br {
  display: none;
}

.page-about .about-lede {
  margin: 0 0 28px;
  max-width: var(--about-measure);
  font-size: 17px;
  line-height: 1.85;
  color: var(--color-ink);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-night);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figcap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 32px 18px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-paper);
  background: linear-gradient(to top, rgba(16, 28, 51, 0.86), rgba(16, 28, 51, 0));
}

.page-about .about-facts {
  display: grid;
  gap: 18px;
  margin: 36px 0 0;
  padding: 24px 0 0;
  list-style: none;
  border-top: 1px solid var(--shell-line);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-danxia);
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-gray);
}

/* ---------- 主体两列 ---------- */
.page-about .about-body {
  display: grid;
  gap: 28px;
  padding-bottom: 96px;
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--shell-line);
  font-size: 13px;
  line-height: 1.2;
  color: var(--color-gray);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-gold);
}

.page-about .about-rail-link:hover {
  color: var(--color-danxia-deep);
  background: rgba(158, 59, 39, 0.08);
  border-color: rgba(158, 59, 39, 0.28);
}

.page-about .about-rail-link[aria-current="true"] {
  color: var(--color-danxia-deep);
  font-weight: 600;
  background: rgba(200, 145, 47, 0.16);
  border-color: rgba(158, 59, 39, 0.4);
}

.page-about .about-col {
  display: grid;
  gap: 0;
  min-width: 0;
}

/* ---------- 分区通用 ---------- */
.page-about .about-sec {
  position: relative;
  margin-bottom: 36px;
  padding: clamp(26px, 4.4vw, 56px);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-sec .sec-label {
  color: var(--color-danxia);
}

.page-about .about-sec .sec-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--color-ink);
}

.page-about .about-prose {
  max-width: var(--about-measure);
  margin: 0 0 18px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--color-ink);
}

.page-about .about-inline-link {
  color: var(--color-danxia);
  text-decoration: none;
  border-bottom: 1px solid rgba(158, 59, 39, 0.4);
}

.page-about .about-inline-link:hover {
  color: var(--color-danxia-deep);
  border-bottom-color: var(--color-danxia-deep);
}

.page-about .about-sec--paper {
  background: var(--color-paper);
  border: 1px solid var(--shell-line);
}

.page-about .about-sec--sand {
  background: var(--color-sand);
}

.page-about .about-sec--night {
  background: var(--color-night);
}

.page-about .about-sec--teal {
  background: var(--color-teal-deep);
}

.page-about .about-sec--danxia {
  background: var(--color-danxia);
}

.page-about .about-sec--night .sec-label,
.page-about .about-sec--teal .sec-label,
.page-about .about-sec--danxia .sec-label {
  color: var(--color-cyan);
}

.page-about .about-sec--night .sec-title,
.page-about .about-sec--teal .sec-title,
.page-about .about-sec--danxia .sec-title {
  color: var(--color-paper);
}

.page-about .about-sec--night .about-prose,
.page-about .about-sec--teal .about-prose,
.page-about .about-sec--danxia .about-prose {
  color: rgba(245, 240, 230, 0.84);
}

.page-about .about-sec--night .about-inline-link,
.page-about .about-sec--teal .about-inline-link,
.page-about .about-sec--danxia .about-inline-link {
  color: var(--color-cyan);
  border-bottom-color: rgba(47, 212, 195, 0.5);
}

.page-about .about-note {
  margin: 28px 0 0;
  max-width: var(--about-measure);
  padding-left: 16px;
  border-left: 4px solid var(--color-danxia);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray);
}

/* ---------- 三条服务线 ---------- */
.page-about .about-services {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-service {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 24px 22px;
  border-radius: var(--radius-md);
  color: var(--color-paper);
}

.page-about .about-service--schedule {
  background: var(--color-danxia);
}

.page-about .about-service--data {
  background: var(--color-night);
}

.page-about .about-service--watch {
  background: var(--color-teal-deep);
}

.page-about .about-service-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-gold);
}

.page-about .about-service-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-service-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.86);
}

.page-about .about-service-list {
  display: grid;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.78);
}

.page-about .about-service-list li {
  position: relative;
  padding-left: 16px;
}

.page-about .about-service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-cyan);
}

.page-about .about-service-link {
  margin-top: auto;
  padding-top: 8px;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 195, 0.45);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  display: grid;
  gap: 12px;
  padding: 24px 0;
  border-top: 1px solid var(--shell-line-light);
}

.page-about .about-node:last-child {
  border-bottom: 1px solid var(--shell-line-light);
}

.page-about .about-node-year {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-node-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 5.2vw, 3.1rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-cyan);
}

.page-about .about-node-dot {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--color-cyan), rgba(47, 212, 195, 0));
}

.page-about .about-node-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.35;
  color: var(--color-paper);
}

.page-about .about-node-body p {
  max-width: var(--about-measure);
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.8);
}

.page-about .about-figure {
  position: relative;
  margin: 36px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-danxia-deep);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 内容生产 ---------- */
.page-about .about-produce {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .about-produce-figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-night);
}

.page-about .about-produce-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

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

.page-about .about-team li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 0;
  border-top: 1px solid var(--shell-line);
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.4;
  color: var(--color-danxia);
}

.page-about .about-team-body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink);
}

.page-about .about-team-body strong {
  display: block;
  font-weight: 700;
  color: var(--color-danxia-deep);
}

.page-about .about-clock-wrap {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 2px solid var(--color-danxia);
}

.page-about .about-clock-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.35;
  color: var(--color-ink);
}

.page-about .about-clock {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-clock li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(23, 19, 16, 0.1);
}

.page-about .about-clock-time {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-danxia);
}

.page-about .about-clock-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-ink);
}

.page-about .about-clock-foot {
  margin: 18px 0 0;
  max-width: var(--about-measure);
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-gray);
}

/* ---------- 覆盖城市 ---------- */
.page-about .about-cities {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-city {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 12px 26px;
  border-radius: var(--radius-sm);
  background: rgba(245, 240, 230, 0.07);
  transition: background-color 0.2s var(--ease);
}

.page-about .about-city:hover {
  background: rgba(245, 240, 230, 0.14);
}

.page-about .about-city-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-cyan);
  flex: none;
}

.page-about .about-city-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-paper);
}

.page-about .about-city-tag {
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--color-gold);
  color: var(--color-night);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-city-freq {
  position: absolute;
  left: 27px;
  bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--color-cyan);
  opacity: 1;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-partners {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--shell-line-light);
}

.page-about .about-partners-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.35;
  color: var(--color-paper);
}

/* ---------- 收束 ---------- */
.page-about .about-quote {
  margin: 0 0 28px;
  max-width: var(--about-measure);
  padding-left: 18px;
  border-left: 4px solid var(--color-gold);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.3rem);
  line-height: 1.7;
  color: var(--color-paper);
}

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

.page-about .about-reason {
  padding: 20px 0;
  border-top: 1px solid rgba(245, 240, 230, 0.24);
}

.page-about .about-reason-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.35;
  color: var(--color-paper);
}

.page-about .about-reason p {
  max-width: var(--about-measure);
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.84);
}

.page-about .about-close {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 2px solid rgba(245, 240, 230, 0.4);
}

.page-about .about-close-text {
  max-width: var(--about-measure);
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-paper);
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-btn-ghost {
  border: 1px solid rgba(245, 240, 230, 0.7);
  color: var(--color-paper);
  background: transparent;
}

.page-about .about-btn-ghost:hover {
  background: rgba(245, 240, 230, 0.14);
  color: var(--color-paper);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-cities {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-clock li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero {
    padding-top: 28px;
    padding-bottom: 72px;
  }

  .page-about .about-h1-br {
    display: inline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-produce {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: clamp(28px, 4vw, 52px);
    align-items: start;
  }

  .page-about .about-produce-figure {
    margin-top: 46px;
  }

  .page-about .about-services {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-bottom: 40px;
  }

  .page-about .about-service:nth-child(2) {
    transform: translateY(34px);
  }

  .page-about .about-node {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: clamp(28px, 4vw, 48px);
    padding: 30px 0;
  }

  .page-about .about-node-year {
    align-self: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 116px minmax(0, 1fr);
    column-gap: clamp(24px, 3vw, 44px);
    align-items: start;
    gap: 0;
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-link {
    border-radius: var(--radius-sm);
    border: 0;
    border-left: 2px solid var(--shell-line);
    padding: 9px 10px;
  }

  .page-about .about-rail-link[aria-current="true"] {
    border-left-color: var(--color-danxia);
    background: rgba(200, 145, 47, 0.14);
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-reason {
    border-top: 1px solid rgba(245, 240, 230, 0.24);
    padding: 20px 0 0;
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-city-freq {
    opacity: 0;
    transform: translateY(-4px);
  }

  .page-about .about-city:hover .about-city-freq,
  .page-about .about-city:focus-within .about-city-freq {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-city-freq,
  .page-about .about-rail-link,
  .page-about .about-city {
    transition: none;
  }

  .page-about .about-service:nth-child(2) {
    transform: none;
  }
}