.page-about {
  --about-line: rgba(243, 233, 210, 0.16);
  --about-line-strong: rgba(243, 233, 210, 0.34);
  --about-panel: rgba(44, 62, 80, 0.32);
  background: var(--lt-ink);
  color: var(--lt-cream);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about h2 {
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  margin: 0.7rem 0 0.8rem;
  color: var(--lt-cream);
}

.page-about h3 {
  font-size: 1.08rem;
  line-height: 1.4;
  margin: 0 0 0.5rem;
  color: var(--lt-cream);
}

.page-about p {
  margin: 0 0 0.9rem;
}

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

/* 面包屑 */
.about-crumb {
  padding-top: clamp(1rem, 3vw, 1.6rem);
}

.page-about .about-crumb a {
  color: var(--lt-text-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s var(--lt-ease), color 0.25s var(--lt-ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--lt-red);
  border-bottom-color: var(--lt-red);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.4rem, 3vw, 2rem) 0 clamp(2rem, 5vw, 3.4rem);
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(215, 38, 61, 0.24), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(44, 62, 80, 0.62), transparent 62%),
    var(--lt-ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.page-about .about-hero__lead h1 {
  font-size: clamp(2.05rem, 7vw, 3.85rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1rem;
  color: var(--lt-cream);
  text-wrap: balance;
}

.page-about .about-hero__lead .lt-lede {
  max-width: 46ch;
  color: var(--lt-text-soft);
}

.page-about .about-hero__fig {
  border: 1px solid var(--about-line-strong);
  background: var(--lt-ink-2);
  padding: 10px;
  box-shadow: var(--lt-shadow);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__facts li {
  background: rgba(26, 20, 22, 0.92);
  padding: 0.85rem 1rem 0.9rem;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--lt-font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  line-height: 1.1;
  color: var(--lt-red);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--lt-mist);
}

/* 主体骨架 */
.page-about .about-body {
  display: grid;
  gap: 2rem;
  padding-block: clamp(2rem, 5vw, 3.4rem);
}

.page-about .about-index {
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--lt-red);
  background: var(--about-panel);
  padding: 1rem 1.1rem;
}

.page-about .about-index__title {
  font-family: var(--lt-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lt-gold);
  margin: 0 0 0.7rem;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.3rem 0;
  font-size: 0.92rem;
  color: var(--lt-text-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--lt-ease), border-color 0.25s var(--lt-ease);
}

.page-about .about-index__no {
  font-family: var(--lt-font-mono);
  font-size: 0.72rem;
  color: var(--lt-mist);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--lt-red);
  border-bottom-color: var(--lt-red);
}

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

.page-about .about-sec {
  padding-bottom: clamp(2.2rem, 5vw, 3.4rem);
  margin-bottom: clamp(2.2rem, 5vw, 3.4rem);
  border-bottom: 1px solid var(--about-line);
  scroll-margin-top: 120px;
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
}

.page-about .about-sec__head {
  max-width: 62ch;
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .about-sec__head .lt-prose {
  color: var(--lt-text-soft);
}

/* 发展阶段时间轴 */
.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--lt-red), rgba(217, 164, 65, 0.55), rgba(243, 233, 210, 0.06));
}

.page-about .about-track__item {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 1.15rem;
}

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

.page-about .about-track__dot {
  position: absolute;
  left: 2px;
  top: 1rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--lt-red);
  background: var(--lt-ink);
  transition: background 0.25s var(--lt-ease), box-shadow 0.25s var(--lt-ease);
}

.page-about .about-track__card {
  border-left: 3px solid var(--lt-gold);
  padding: 1rem 1.1rem 1.1rem;
}

.page-about .about-track__when {
  font-family: var(--lt-font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--lt-gold);
  margin: 0 0 0.4rem;
}

.page-about .about-track__card p {
  color: var(--lt-text-soft);
  font-size: 0.95rem;
}

.page-about .about-track__item:hover .about-track__dot,
.page-about .about-track__item:focus-visible .about-track__dot {
  background: var(--lt-red);
  box-shadow: 0 0 0 5px rgba(215, 38, 61, 0.22);
}

.page-about .about-track__item:focus-visible {
  outline: 2px solid var(--lt-gold);
  outline-offset: 4px;
}

/* 服务版图 */
.page-about .about-sec--map .about-map__fig {
  margin: 0 0 1.6rem;
  border: 1px solid var(--about-line-strong);
}

.page-about .about-map {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.55rem;
}

.page-about .about-map__city {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--about-line);
  background: var(--about-panel);
  font-size: 0.92rem;
  color: var(--lt-cream);
  transition: transform 0.25s var(--lt-ease), border-color 0.25s var(--lt-ease), background 0.25s var(--lt-ease);
}

.page-about .about-map__city em {
  margin-left: auto;
  font-family: var(--lt-font-mono);
  font-size: 0.68rem;
  font-style: normal;
  color: var(--lt-gold);
  white-space: nowrap;
}

.page-about .about-map__pin {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lt-teal);
  flex: none;
  transition: background 0.25s var(--lt-ease);
}

.page-about .about-map__city:hover {
  transform: translateY(-3px);
  border-color: var(--lt-red);
  background: rgba(215, 38, 61, 0.16);
}

.page-about .about-map__city:hover .about-map__pin {
  background: var(--lt-red);
}

.page-about .about-map__notes {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

.page-about .about-note {
  border: 1px dashed var(--about-line-strong);
  padding: 1rem 1.1rem;
  background: rgba(26, 20, 22, 0.6);
}

.page-about .about-note h3 {
  font-family: var(--lt-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--lt-gold);
  text-transform: none;
}

.page-about .about-note p {
  color: var(--lt-text-soft);
  font-size: 0.95rem;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 1rem;
}

.page-about .about-team__card {
  padding: 1.1rem 1.15rem 1.2rem;
  position: relative;
}

.page-about .about-team__no {
  display: inline-block;
  font-family: var(--lt-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--lt-red);
  margin-bottom: 0.5rem;
}

.page-about .about-team__card p {
  color: var(--lt-text-soft);
  font-size: 0.94rem;
}

.page-about .about-team__fig {
  margin: 1.6rem 0 0;
  border: 1px solid var(--about-line-strong);
}

/* 账号与安全 */
.page-about .about-secure {
  display: grid;
  gap: 1.4rem;
}

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

.page-about .about-secure__list li {
  border-bottom: 1px solid var(--about-line);
  padding: 0.95rem 0;
  color: var(--lt-text-soft);
  font-size: 0.95rem;
  display: grid;
  gap: 0.25rem;
}

.page-about .about-secure__no {
  font-family: var(--lt-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--lt-teal);
}

.page-about .about-secure__panel {
  border: 1px solid var(--about-line-strong);
  border-top: 3px solid var(--lt-red);
  background: rgba(46, 36, 36, 0.72);
  padding: 1.2rem 1.2rem 1.3rem;
}

.page-about .about-secure__panel-title {
  font-size: 1.02rem;
  color: var(--lt-cream);
  margin-bottom: 0.6rem;
}

.page-about .about-secure__panel p {
  color: var(--lt-text-soft);
  font-size: 0.95rem;
}

.page-about .about-secure__meta {
  font-family: var(--lt-font-mono);
  font-size: 0.8rem;
  color: var(--lt-gold);
  margin-top: 0.9rem;
}

/* 里程碑 */
.page-about .about-chart {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 1.6rem;
  background: linear-gradient(180deg, rgba(44, 62, 80, 0.4), transparent);
  border: 1px solid var(--about-line);
}

.page-about .about-chart__axis {
  stroke: var(--about-line-strong);
  stroke-width: 1;
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--lt-red);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-chart__node {
  fill: var(--lt-ink);
  stroke: var(--lt-gold);
  stroke-width: 3;
}

.page-about .about-chart__node--now {
  fill: var(--lt-red);
  stroke: var(--lt-gold);
}

.page-about .about-miles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-miles__item {
  border-left: 3px solid var(--lt-red);
  padding: 0.2rem 0 0.4rem 0.95rem;
}

.page-about .about-miles__no {
  font-family: var(--lt-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--lt-gold);
}

.page-about .about-miles__item p {
  color: var(--lt-text-soft);
  font-size: 0.94rem;
  margin: 0;
}

/* 联系引导 */
.page-about .about-cta {
  border: 1px solid var(--about-line-strong);
  border-top: 4px solid var(--lt-red);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(215, 38, 61, 0.2), transparent 60%),
    rgba(46, 36, 36, 0.8);
  padding: clamp(1.5rem, 4vw, 2.4rem);
}

.page-about .about-cta p {
  max-width: 58ch;
  color: var(--lt-text-soft);
  margin-bottom: 1.4rem;
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }

  .page-about .about-hero__fig {
    align-self: start;
  }

  .page-about .about-sec--map .about-map__fig {
    margin-bottom: 2rem;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-index {
    position: sticky;
    top: 124px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-index__list a {
    width: 100%;
    padding-left: 0.55rem;
    border-left: 2px solid transparent;
    border-bottom: 0;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left-color: var(--lt-red);
  }

  .page-about .about-secure {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

  .page-about .about-track__item {
    padding-left: 3rem;
  }
}

.page-about .about-map__city,
.page-about .about-team__card,
.page-about .about-note,
.page-about .about-secure__panel,
.page-about .about-cta {
  overflow-wrap: anywhere;
}
</