.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
  padding-bottom: var(--s5);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  padding-top: var(--s3);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .about-crumbs a {
  color: var(--navy);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.16s ease-out, color 0.16s ease-out;
}
.page-about .about-crumbs a:hover {
  color: var(--red);
  border-bottom-color: var(--gold);
}
.page-about .about-crumbs__sep {
  margin: 0 8px;
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: var(--s4) 0 var(--s5);
}
.page-about .about-hero__grid {
  display: grid;
  gap: var(--s4);
}
.page-about .about-hero__text {
  position: relative;
  padding-left: var(--s3);
  border-left: 3px solid var(--red);
}
.page-about .about-hero__text::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 0;
  width: 3px;
  height: 72px;
  background: var(--gold);
}
.page-about .about-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s2);
  margin: 0 0 var(--s3);
}
.page-about .about-hero__version {
  display: inline-block;
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--white);
  background: var(--navy);
  border-left: 3px solid var(--gold);
}
.page-about .about-hero__title {
  margin: 0 0 var(--s3);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 4.6vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--navy);
}
.page-about .about-hero__lede {
  max-width: 32em;
  margin: 0 0 var(--s4);
  color: var(--ink);
}
.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s3) var(--s2);
  max-width: 640px;
}
.page-about .fact {
  border-top: 3px solid var(--red);
  padding-top: var(--s2);
}
.page-about .fact__num {
  display: block;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--navy);
}
.page-about .fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 10px;
  background: var(--white);
  border: 1px solid var(--navy);
  box-shadow: var(--shadow-card);
}
.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  top: 22px;
  right: 22px;
  width: 48px;
  height: 24px;
  border: 1px solid var(--navy);
  background: conic-gradient(var(--red) 0 25%, var(--white) 0 50%, var(--red) 0 75%, var(--white) 0) 0 0 / 24px 24px;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}
.page-about .about-hero__figure figcaption {
  padding: 10px 2px 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------- 品牌主张 ---------- */
.page-about .about-claim {
  padding: var(--s5) 0;
}
.page-about .about-claim__rule {
  height: 12px;
  margin-bottom: var(--s5);
  background-image: repeating-linear-gradient(to right, var(--gold) 0 2px, transparent 2px 14px);
  background-size: 14px 100%;
  opacity: 0.6;
}
.page-about .about-claim__grid {
  display: grid;
  gap: var(--s4);
}
.page-about .about-claim__title {
  margin: 0 0 var(--s3);
  padding-bottom: var(--s2);
  border-bottom: 3px solid var(--navy);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--navy);
}
.page-about .about-claim__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin: var(--s4) 0 0;
}
.page-about .about-claim__aside {
  display: flex;
  align-items: flex-start;
  gap: var(--s3);
  padding-top: var(--s3);
  border-top: 1px solid var(--hair);
}
.page-about .rail-note {
  flex: none;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--navy);
  opacity: 0.72;
}
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-block {
  padding: var(--s5) 0;
  background: var(--paper-2);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 44px;
  list-style: none;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(to bottom, var(--navy) 0%, var(--navy) 40%, var(--gold) 100%);
}
.page-about .tl-node {
  position: relative;
}
.page-about .tl-node + .tl-node {
  margin-top: var(--s3);
}
.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -44px;
  top: 17px;
  width: 16px;
  height: 16px;
  border: 1px solid var(--navy);
  background: conic-gradient(var(--red) 0 25%, var(--white) 0 50%, var(--red) 0 75%, var(--white) 0) 0 0 / 16px 16px;
}
.page-about .tl-item {
  background: var(--white);
  border: 1px solid var(--hair);
  border-left: 4px solid var(--red);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease-out, border-left-color 0.2s ease-out;
}
.page-about .tl-node:nth-child(even) .tl-item {
  margin-left: 16px;
}
.page-about .tl-item:hover {
  transform: translateY(-3px) rotate(-0.8deg);
  border-left-color: var(--gold);
}
.page-about .tl-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: var(--s3);
  cursor: pointer;
  list-style: none;
}
.page-about .tl-item__head::-webkit-details-marker {
  display: none;
}
.page-about .tl-item__year {
  flex: none;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--red);
  border: 1px solid var(--red);
}
.page-about .tl-item__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--navy);
}
.page-about .tl-item__body {
  padding: var(--s3);
  background: var(--paper);
  border-top: 1px dashed var(--hair);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .tl-item__body p {
  margin: 0;
}
.page-about .tl-item[open] .tl-item__head {
  padding-bottom: var(--s2);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--s6) 0 var(--s5);
}
.page-about .about-team__grid {
  display: grid;
  gap: var(--s4);
}
.page-about .about-team__text p {
  margin: 0 0 var(--s3);
}
.page-about .about-team__text p:last-child {
  margin-bottom: 0;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  padding: var(--s5) 0;
}
.page-about .about-flow__grid {
  display: grid;
  gap: var(--s4);
}
.page-about .about-flow__figure {
  margin: 0;
  padding: 8px;
  background: var(--paper-2);
  border: 1px solid var(--hair);
}
.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.page-about .about-flow__figure figcaption {
  padding: 10px 2px 2px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .about-flow__title {
  margin: 0 0 var(--s4);
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--navy);
}
.page-about .flow-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}
.page-about .flow-step {
  position: relative;
  counter-increment: flow;
  padding: var(--s3) 0 var(--s3) 58px;
  border-top: 1px solid var(--hair);
}
.page-about .flow-step:last-child {
  border-bottom: 1px solid var(--hair);
}
.page-about .flow-step::before {
  content: "0" counter(flow);
  position: absolute;
  left: 0;
  top: var(--s3);
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: var(--navy);
}
.page-about .flow-step__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--red);
  letter-spacing: 0.02em;
}
.page-about .flow-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .about-flow__note {
  margin: var(--s4) 0 0;
  padding-left: var(--s3);
  border-left: 3px solid var(--gold);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */
.page-about .about-source {
  position: relative;
  overflow: hidden;
  padding: var(--s6) 0;
  background: var(--navy);
  color: var(--white);
}
.page-about .about-source::after {
  content: "";
  position: absolute;
  right: -48px;
  bottom: -48px;
  width: 240px;
  height: 240px;
  background: conic-gradient(var(--red) 0 25%, var(--navy-deep) 0 50%, var(--red) 0 75%, var(--navy-deep) 0) 0 0 / 60px 60px;
  opacity: 0.22;
  pointer-events: none;
}
.page-about .about-source__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--s4);
}
.page-about .about-source__title {
  margin: 0 0 var(--s3);
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--white);
}
.page-about .about-source__figure {
  display: block;
  font-size: clamp(64px, 10vw, 108px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--gold);
}
.page-about .about-source__caption {
  display: block;
  margin-top: var(--s2);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.75);
}
.page-about .about-source__body p {
  max-width: 34em;
  margin: 0 0 var(--s3);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.9);
}
.page-about .about-source__list {
  margin: var(--s4) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .about-source__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
}
.page-about .about-source__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  background: var(--gold);
}

/* ---------- 联系 ---------- */
.page-about .about-reach {
  padding: var(--s6) 0 var(--s5);
}
.page-about .about-reach__grid {
  display: grid;
  gap: var(--s3);
}
.page-about .reach-card {
  padding: var(--s4) var(--s3) var(--s3);
  background: var(--white);
  border: 1px solid var(--hair);
  border-top: 4px solid var(--red);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease-out, border-top-color 0.2s ease-out;
}
.page-about .reach-card:hover {
  transform: translateY(-3px);
  border-top-color: var(--gold);
}
.page-about .reach-card__key {
  margin: 0 0 var(--s2);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}
.page-about .reach-card__val {
  margin: 0 0 var(--s3);
  font-family: var(--font-mono);
  font-size: clamp(15px, 2.2vw, 19px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--navy);
  word-break: break-word;
}
.page-about .reach-card__hint {
  margin: 0;
  padding-top: var(--s3);
  border-top: 1px dashed var(--hair);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-reach__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s3);
  margin-top: var(--s4);
  padding-top: var(--s3);
  border-top: 1px solid var(--hair);
}
.page-about .about-reach__note {
  flex: 1 1 220px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-reach__icp {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-reach__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-source__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--s2);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--s5);
    align-items: end;
  }
  .page-about .about-hero__text {
    padding-left: var(--s4);
  }
  .page-about .about-claim__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--s5) var(--s6);
  }
  .page-about .about-claim__aside {
    border-top: none;
    padding-top: 0;
    border-left: 1px solid var(--hair);
    padding-left: var(--s4);
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--s5);
    align-items: start;
  }
  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: var(--s5);
    align-items: center;
  }
  .page-about .about-source__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: var(--s6);
    align-items: start;
  }
  .page-about .about-reach__foot {
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .reach-card,
  .page-about .about-crumbs a {
    transition: none;
  }
  .page-about .tl-item:hover,
  .page-about .reach-card:hover {
    transform: none;
  }
}
</main>