.page-about {
  --about-gap: clamp(1.5rem, 4vw, 3.4rem);
  --about-pad: clamp(3rem, 8vw, 6rem);
  --about-rail-axis: 9px;
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(2.4rem, 6vw, 4.2rem));
  padding-bottom: clamp(3rem, 7vw, 5.4rem);
  background:
    radial-gradient(120% 88% at 84% 6%, rgba(28, 78, 128, .55), transparent 62%),
    linear-gradient(158deg, var(--night) 0%, var(--royal) 56%, var(--night) 100%);
  color: var(--paper);
  border-bottom: 3px solid var(--gold);
}

.page-about .about-hero-inner {
  position: relative;
}

.page-about .about-hero-eyebrow {
  color: var(--gold);
  margin: 1.6rem 0 0;
}

.page-about .about-hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 7.2vw, 4.9rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  margin: .7rem 0 0;
  max-width: 17ch;
  text-wrap: balance;
}

.page-about .about-hero-lead {
  margin: 1.5rem 0 0;
  max-width: 36rem;
  font-size: clamp(1rem, 2.1vw, 1.1rem);
  line-height: 1.85;
  color: rgba(237, 232, 222, .9);
}

.page-about .about-hero-facts {
  margin-top: clamp(2rem, 5vw, 3.2rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-fact {
  background: rgba(7, 22, 43, .78);
  padding: 1.05rem 1.1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: .4rem;
  min-width: 0;
}

.page-about .about-fact-num {
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.1;
  letter-spacing: .01em;
}

.page-about .about-fact-label {
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--steel);
}

@media (min-width: 780px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 章节索引 ---------- */

.page-about .about-toc {
  position: sticky;
  top: var(--header-h-sm);
  z-index: 6;
  background: rgba(7, 22, 43, .96);
  border-bottom: 1px solid var(--line-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

@media (min-width: 900px) {
  .page-about .about-toc {
    top: var(--header-h);
  }
}

.page-about .about-toc-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: .6rem;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc-label {
  flex: none;
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-toc-list {
  display: flex;
  gap: .35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc-list a {
  display: inline-block;
  white-space: nowrap;
  padding: .34rem .68rem;
  font-size: .79rem;
  letter-spacing: .06em;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease, transform .18s ease;
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  color: var(--gold-soft);
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  padding-block: var(--about-pad);
}

.page-about .about-timeline-head {
  max-width: 44rem;
}

.page-about .about-timeline-banner {
  margin: clamp(1.8rem, 4vw, 2.8rem) 0 0;
}

.page-about .about-rail {
  list-style: none;
  margin: clamp(2.2rem, 5vw, 3.6rem) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 3.6vw, 2.4rem);
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: var(--about-rail-axis);
  top: .7rem;
  bottom: .7rem;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(217, 169, 74, .5) 60%, rgba(217, 169, 74, .08) 100%);
}

.page-about .about-rail-item {
  position: relative;
  padding-left: 2.3rem;
  transition: transform .25s ease;
}

.page-about .about-rail-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail-axis) - 6px);
  top: .5rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--royal);
  border: 3px solid var(--gold);
  transition: transform .22s ease, box-shadow .22s ease;
}

.page-about .about-rail-item:hover::before,
.page-about .about-rail-item:focus-within::before {
  transform: scale(1.28);
  box-shadow: 0 0 0 6px rgba(217, 169, 74, .16);
}

.page-about .about-rail-year {
  font-size: clamp(1.05rem, 2.8vw, 1.3rem);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: .05em;
  line-height: 1.2;
}

.page-about .about-rail-body {
  margin-top: .45rem;
  transition: transform .25s ease;
}

.page-about .about-rail-item:hover .about-rail-body {
  transform: translateX(4px);
}

.page-about .about-rail-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.8vw, 1.38rem);
  margin: 0 0 .5rem;
  color: var(--paper);
}

.page-about .about-rail-body p {
  margin: 0;
  max-width: 48ch;
  font-size: .95rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-rail-body a {
  color: var(--gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 860px) {
  .page-about .about-rail {
    --about-rail-axis: 119px;
  }

  .page-about .about-rail-item {
    display: grid;
    grid-template-columns: 100px minmax(0, 1fr);
    column-gap: 2.4rem;
    padding-left: 0;
  }

  .page-about .about-rail-item::before {
    top: .42rem;
  }

  .page-about .about-rail-body {
    margin-top: 0;
  }
}

/* ---------- 服务版图 ---------- */

.page-about .about-coverage {
  padding-block: var(--about-pad);
  color: var(--ink);
}

.page-about .about-coverage-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.4rem);
}

.page-about .about-coverage .section-title {
  color: var(--ink);
}

.page-about .about-coverage .eyebrow {
  color: var(--jewel);
}

.page-about .about-coverage .prose {
  margin-top: 1.2rem;
}

.page-about .about-city-list {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.page-about .about-city {
  font-family: var(--font-mono);
  font-size: .81rem;
  letter-spacing: .04em;
  padding: .38rem .72rem;
  border: 1px solid rgba(17, 22, 28, .22);
  background: rgba(255, 255, 255, .55);
  color: var(--ink);
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.page-about .about-city:hover {
  background: var(--night);
  color: var(--gold-soft);
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .about-coverage-note {
  margin: 1.6rem 0 0;
  padding-left: .9rem;
  border-left: 3px solid var(--gold);
  font-size: .92rem;
  line-height: 1.75;
  color: rgba(17, 22, 28, .78);
}

.page-about .about-coverage-note a {
  color: var(--jewel);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 920px) {
  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }
}

/* ---------- 客服团队 ---------- */

.page-about .about-team {
  padding-block: var(--about-pad);
}

.page-about .about-team-grid {
  display: grid;
  gap: clamp(1.8rem, 5vw, 3rem);
}

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

.page-about .about-team-copy .prose {
  margin-top: 1.2rem;
  color: var(--steel);
}

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: center;
  }
}

.page-about .about-team-cards {
  list-style: none;
  margin: clamp(2.2rem, 5vw, 3.4rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team-card {
  background: var(--night);
  padding: 1.4rem 1.2rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
  min-width: 0;
  transition: background .2s ease, transform .2s ease;
}

.page-about .about-team-card:hover {
  background: var(--royal);
  transform: translateY(-4px);
}

.page-about .about-team-num {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--amber);
  line-height: 1;
}

.page-about .about-team-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: .89rem;
  line-height: 1.74;
  color: var(--steel);
}

@media (min-width: 700px) {
  .page-about .about-team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-team-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 资质与合作 ---------- */

.page-about .about-trust {
  padding-block: var(--about-pad);
  border-top: 3px solid var(--chart);
}

.page-about .about-trust-grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.2rem);
  margin-top: clamp(2rem, 5vw, 3.2rem);
}

.page-about .about-disclosure {
  border: 1px solid var(--line-strong);
  background: rgba(14, 42, 74, .5);
  margin-bottom: 1rem;
  transition: border-color .2s ease;
}

.page-about .about-disclosure:hover {
  border-color: rgba(217, 169, 74, .6);
}

.page-about .about-disclosure .disclosure-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.05rem 1.15rem;
  background: none;
  border: 0;
  color: var(--paper);
  font: inherit;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.page-about .about-cert-mark {
  flex: none;
  display: inline-flex;
  color: var(--gold);
}

.page-about .about-cert-name {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: .01em;
  min-width: 0;
}

.page-about .about-disclosure .disclosure-panel {
  padding: 0 1.15rem 1.15rem 3.9rem;
}

.page-about .about-disclosure .disclosure-panel p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.76;
  color: var(--steel);
}

.page-about .about-cert-note {
  margin: 1.4rem 0 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--steel);
  padding-left: .9rem;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-partners {
  border: 1px solid var(--line-strong);
  background: rgba(18, 98, 92, .16);
  padding: clamp(1.4rem, 3.4vw, 2rem);
}

.page-about .about-partners-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  color: var(--paper);
}

.page-about .about-partners-lead {
  margin: .7rem 0 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-partner-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-partner {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: .5rem;
}

.page-about .about-partner-tag {
  justify-self: start;
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--gold);
  padding: .22rem .55rem;
  border: 1px solid rgba(217, 169, 74, .55);
}

.page-about .about-partner p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--steel);
}

@media (min-width: 920px) {
  .page-about .about-trust-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-partner {
    grid-template-columns: 11rem minmax(0, 1fr);
    column-gap: 1.2rem;
    align-items: start;
  }

  .page-about .about-partner-tag {
    align-self: start;
  }
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  padding-block: clamp(3rem, 7vw, 5rem);
}

.page-about .about-next-inner {
  display: grid;
  gap: 1.1rem;
  justify-items: start;
  max-width: 48rem;
}

.page-about .about-next .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-next-lead {
  margin: 0 0 .6rem;
  font-size: clamp(.98rem, 2vw, 1.08rem);
  line-height: 1.82;
  color: rgba(237, 232, 222, .9);
}

.page-about .about-next-alt {
  margin: .4rem 0 0;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(237, 232, 222, .72);
}

.page-about .about-next-alt a {
  color: var(--gold-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}
</main>