.page-about {
  --about-year-col: 104px;
  --about-rail-w: 108px;
  background: var(--snow);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: calc(var(--announce-h) + var(--header-h) + 20px);
  font-size: var(--fs-xs);
  color: var(--ridge);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 clamp(48px, 7vw, 96px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: var(--mist);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-hero__title {
  font-size: var(--fs-display);
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.08;
  margin: 16px 0 24px;
  color: var(--ink);
}

.page-about .about-hero__text {
  max-width: 54ch;
  color: var(--ridge);
  font-size: var(--fs-lead);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  background: var(--mist);
  border-top: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
}

.page-about .about-fact {
  background: var(--snow);
  padding: 18px 16px 20px;
}

.page-about .about-fact dt {
  font-size: var(--fs-xs);
  color: var(--ridge);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.page-about .about-fact dd {
  font-size: clamp(24px, 3.4vw, 31px);
  font-weight: 600;
  color: var(--deep);
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.1em;
}

.page-about .about-fact__unit {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--lake);
  letter-spacing: 0.02em;
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-radius: 6px;
  overflow: hidden;
  background: linear-gradient(140deg, rgba(14, 107, 168, 0.18), rgba(78, 159, 209, 0.06));
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 5px 10px;
  font-size: var(--fs-xs);
  color: var(--snow);
  background: rgba(8, 25, 43, 0.72);
  border-radius: 3px;
  letter-spacing: 0.04em;
}

/* ---------- 通用区块微调 ---------- */
.page-about .section__head {
  margin-bottom: clamp(32px, 5vw, 60px);
}

.page-about .section__head > p {
  color: var(--ridge);
  line-height: 1.85;
  max-width: 52ch;
}

/* ---------- 航程时间轴 ---------- */
.page-about .about-voyage {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .about-voyage__note,
.page-about .about-roles__note,
.page-about .about-standards__note,
.page-about .about-clients__note {
  color: var(--ridge);
}

.page-about .voyage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .voyage__rail {
  position: sticky;
  top: calc(var(--announce-h) + var(--header-h) + 12px);
  z-index: 3;
  background: var(--mist);
  padding: 8px 0;
  margin: 0 calc(var(--pad-x) * -1) 8px;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.page-about .voyage__rail-list {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .voyage__rail-link {
  display: inline-block;
  flex: 0 0 auto;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--lake);
  border: 1px solid var(--lake-2);
  border-radius: 999px;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.page-about .voyage__rail-link:hover,
.page-about .voyage__rail-link:focus-visible {
  background: var(--lake);
  border-color: var(--lake);
  color: var(--snow);
}

.page-about .voyage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--lake-2);
}

.page-about .voyage__item {
  position: relative;
  padding: 0 0 clamp(32px, 4.6vw, 52px) clamp(20px, 3vw, 36px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .voyage__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--snow);
  border: 2px solid var(--lake);
  transition: background var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .voyage__item:hover::before,
.page-about .voyage__item:focus-within::before {
  background: var(--sun);
  border-color: var(--sun);
}

.page-about .voyage__item--now::before {
  background: var(--sun);
  border-color: var(--sun);
  box-shadow: 0 0 0 5px rgba(242, 169, 59, 0.18);
}

.page-about .voyage__year {
  font-size: var(--fs-sm);
  letter-spacing: 0.12em;
  color: var(--lake);
  font-weight: 600;
}

.page-about .voyage__body h3 {
  margin-bottom: 10px;
  color: var(--deep);
}

.page-about .voyage__body p {
  color: var(--ridge);
  line-height: 1.85;
  max-width: 62ch;
  margin-bottom: 10px;
}

.page-about .voyage__body a {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid var(--lake-2);
}

.page-about .voyage__body a:hover,
.page-about .voyage__body a:focus-visible {
  border-bottom-color: var(--sun);
  color: var(--deep);
}

.page-about .voyage__gain {
  display: inline-block;
  font-size: var(--fs-sm);
  color: var(--deep);
  background: rgba(242, 169, 59, 0.14);
  border-left: 3px solid var(--sun);
  padding: 8px 14px;
  border-radius: 0 4px 4px 0;
  line-height: 1.7;
}

.page-about .about-voyage__figure {
  margin: clamp(36px, 5vw, 64px) 0 0;
  position: relative;
  border-radius: 6px;
  overflow: hidden;
}

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

.page-about .about-voyage__figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-xs);
  color: var(--ridge);
  letter-spacing: 0.06em;
}

/* ---------- 岗位分工 ---------- */
.page-about .role-list {
  list-style: none;
  margin: 0 0 clamp(32px, 4vw, 52px);
  padding: 0;
  border-top: 1px solid var(--mist);
}

.page-about .role-list:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 4px;
}

.page-about .role-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px 20px;
  padding: clamp(20px, 2.8vw, 30px) 8px;
  border-bottom: 1px solid var(--mist);
  transition: background var(--t-base) var(--ease), padding-left var(--t-base) var(--ease);
}

.page-about .role-item:hover,
.page-about .role-item:focus-within {
  background: rgba(215, 227, 236, 0.42);
  padding-left: 20px;
}

.page-about .role-item__no {
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--lake-2);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-about .role-item__body h3 {
  margin-bottom: 6px;
  color: var(--deep);
}

.page-about .role-item__count {
  display: inline-block;
  font-size: var(--fs-xs);
  color: var(--lake);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.page-about .role-item__body p:last-child {
  color: var(--ridge);
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .role-flow {
  background: var(--deep);
  color: var(--snow);
  border-radius: 6px;
  padding: clamp(22px, 3vw, 34px);
  position: relative;
  overflow: hidden;
}

.page-about .role-flow::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(23, 195, 178, 0.24), transparent 70%);
  pointer-events: none;
}

.page-about .role-flow__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--aqua);
  margin-bottom: 16px;
}

.page-about .role-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .role-flow__steps li {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: baseline;
  gap: 10px;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: rgba(247, 250, 252, 0.86);
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(78, 159, 209, 0.32);
}

.page-about .role-flow__steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .role-flow__steps .mono {
  color: var(--sun);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
}

/* ---------- 覆盖网络 ---------- */
.page-about .about-network {
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(14, 107, 168, 0.32), transparent 60%),
    var(--deep);
  color: var(--snow);
}

.page-about .about-network .section__head > p {
  color: rgba(215, 227, 236, 0.82);
}

.page-about .about-network .eyebrow {
  color: var(--aqua);
}

.page-about .network__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .network__map {
  background: rgba(247, 250, 252, 0.04);
  border: 1px solid rgba(78, 159, 209, 0.34);
  border-radius: 6px;
  padding: 16px;
}

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

.page-about .network__gridlines line {
  stroke: rgba(78, 159, 209, 0.16);
  stroke-width: 1;
}

.page-about .network__land {
  stroke: rgba(78, 159, 209, 0.5);
  stroke-width: 1.2;
}

.page-about .network__lines line {
  stroke: rgba(242, 169, 59, 0.34);
  stroke-width: 1;
  stroke-dasharray: 4 5;
}

.page-about .network__nodes circle {
  fill: rgba(78, 159, 209, 0.9);
  transition: fill var(--t-base) var(--ease), r var(--t-base) var(--ease);
}

.page-about .network__nodes circle:hover {
  fill: var(--sun);
}

.page-about .network__hub circle:first-child {
  fill: none;
  stroke: var(--sun);
  stroke-width: 1.5;
  opacity: 0.55;
}

.page-about .network__hub circle:last-child {
  fill: var(--sun);
}

.page-about .network__label {
  fill: rgba(247, 250, 252, 0.86);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .network__legend {
  margin-top: 12px;
  font-size: var(--fs-xs);
  color: rgba(215, 227, 236, 0.7);
  letter-spacing: 0.06em;
}

.page-about .network__side h3 {
  color: var(--snow);
  margin-bottom: 18px;
}

.page-about .partner-list {
  list-style: none;
  margin: 0 0 clamp(28px, 3.6vw, 44px);
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .partner-item {
  border-left: 2px solid rgba(78, 159, 209, 0.5);
  padding-left: 16px;
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}

.page-about .partner-item:hover {
  border-color: var(--sun);
  transform: translateX(4px);
}

.page-about .partner-item__tag {
  display: inline-block;
  margin-bottom: 8px;
  font-size: var(--fs-xs);
  color: var(--deep);
}

.page-about .partner-item p:last-child {
  color: rgba(215, 227, 236, 0.78);
  font-size: var(--fs-sm);
  line-height: 1.8;
}

.page-about .network__figure {
  margin: 0;
  border-radius: 6px;
  overflow: hidden;
}

.page-about .network__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .network__figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-xs);
  color: rgba(215, 227, 236, 0.66);
  letter-spacing: 0.05em;
}

/* ---------- 标准与认证 ---------- */
.page-about .about-standards {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .badge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .badge {
  position: relative;
  background: var(--snow);
  border: 1px solid var(--mist);
  border-radius: 6px;
  padding: clamp(22px, 3vw, 34px);
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease);
}

.page-about .badge:hover,
.page-about .badge:focus-within,
.page-about .badge:focus {
  outline: none;
  border-color: var(--lake);
  transform: translateY(-4px);
  box-shadow: 0 14px 30px -20px rgba(8, 25, 43, 0.5);
}

.page-about .badge:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 3px;
}

.page-about .badge__mark {
  width: 48px;
  height: 48px;
  color: var(--lake);
  margin-bottom: 18px;
}

.page-about .badge--sun .badge__mark {
  color: var(--sun);
}

.page-about .badge__code {
  font-size: var(--fs-sm);
  letter-spacing: 0.14em;
  color: var(--ridge);
  margin-bottom: 6px;
}

.page-about .badge__title {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--deep);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.page-about .badge__line {
  color: var(--ridge);
  line-height: 1.85;
  max-width: 46ch;
}

.page-about .badge__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-slow) var(--ease), margin-top var(--t-slow) var(--ease);
  margin-top: 0;
}

.page-about .badge__more > p {
  overflow: hidden;
  color: var(--ridge);
  font-size: var(--fs-sm);
  line-height: 1.85;
  border-top: 1px dashed var(--mist);
  padding-top: 0;
  transition: padding-top var(--t-slow) var(--ease);
}

.page-about .badge:hover .badge__more,
.page-about .badge:focus-within .badge__more,
.page-about .badge:focus .badge__more {
  grid-template-rows: 1fr;
  margin-top: 16px;
}

.page-about .badge:hover .badge__more > p,
.page-about .badge:focus-within .badge__more > p,
.page-about .badge:focus .badge__more > p {
  padding-top: 14px;
}

/* ---------- 合作画像 ---------- */
.page-about .about-clients {
  padding-bottom: clamp(48px, 7vw, 88px);
}

.page-about .clients__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

.page-about .clients__stat {
  background: var(--deep);
  color: var(--snow);
  border-radius: 6px;
  padding: clamp(26px, 3.4vw, 38px);
  background-image: linear-gradient(160deg, rgba(14, 107, 168, 0.55), rgba(8, 25, 43, 0.9));
}

.page-about .clients__stat-num {
  font-size: clamp(52px, 8vw, 76px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--snow);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .clients__stat-num span {
  font-size: 0.42em;
  color: var(--sun);
}

.page-about .clients__stat-label {
  margin-top: 14px;
  font-size: var(--fs-sm);
  color: rgba(215, 227, 236, 0.82);
  line-height: 1.7;
}

.page-about .clients__types {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--mist);
  border-top: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
}

.page-about .client-type {
  background: var(--mist);
  padding: 22px 20px;
  transition: background var(--t-base) var(--ease);
}

.page-about .client-type:hover {
  background: var(--snow);
}

.page-about .client-type__name {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--deep);
  margin-bottom: 10px;
}

.page-about .client-type p {
  color: var(--ridge);
  line-height: 1.85;
  max-width: 60ch;
}

.page-about .about-clients__foot {
  margin-top: clamp(24px, 3vw, 36px);
  color: var(--ridge);
  line-height: 1.85;
  max-width: 66ch;
  border-left: 3px solid var(--lake-2);
  padding-left: 16px;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .about-next__panel {
  border-top: 1px solid var(--ink);
  padding-top: clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 48px);
}

.page-about .about-next__lead p:last-child {
  color: var(--ridge);
  line-height: 1.85;
  max-width: 50ch;
  margin-top: 18px;
}

.page-about .about-next__links {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--mist);
}

.page-about .next-link {
  display: grid;
  grid-template-columns: 36px 1fr;
  grid-template-rows: auto auto;
  column-gap: 12px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--mist);
  text-decoration: none;
  transition: padding-left var(--t-base) var(--ease), background var(--t-base) var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  background: rgba(215, 227, 236, 0.4);
  padding-left: 16px;
}

.page-about .next-link__label {
  grid-row: 1 / span 2;
  font-size: var(--fs-xs);
  color: var(--lake-2);
  letter-spacing: 0.1em;
  padding-top: 4px;
}

.page-about .next-link__title {
  font-size: var(--fs-body);
  font-weight: 700;
  color: var(--deep);
  margin-bottom: 4px;
}

.page-about .next-link__desc {
  font-size: var(--fs-sm);
  color: var(--ridge);
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .voyage__item {
    grid-template-columns: var(--about-year-col) 1fr;
    gap: 0 28px;
  }

  .page-about .voyage__year {
    text-align: right;
    padding-top: 4px;
  }

  .page-about .badge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .role-item {
    grid-template-columns: 76px 1fr;
    gap: 0 28px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-about .voyage {
    grid-template-columns: var(--about-rail-w) 1fr;
    gap: 40px;
  }

  .page-about .voyage__rail {
    position: sticky;
    top: calc(var(--announce-h) + var(--header-h) + 28px);
    background: transparent;
    margin: 0;
    padding: 0;
    align-self: start;
  }

  .page-about .voyage__rail-list {
    flex-direction: column;
    gap: 10px;
    overflow: visible;
    padding: 6px 0 0;
  }

  .page-about .voyage__rail-link {
    border: 0;
    border-radius: 0;
    padding: 4px 0 4px 14px;
    position: relative;
    font-size: var(--fs-sm);
    letter-spacing: 0.1em;
    color: var(--ridge);
  }

  .page-about .voyage__rail-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 1px;
    background: var(--lake-2);
    transition: width var(--t-base) var(--ease), background var(--t-base) var(--ease);
  }

  .page-about .voyage__rail-link:hover,
  .page-about .voyage__rail-link:focus-visible {
    background: transparent;
    color: var(--lake);
  }

  .page-about .voyage__rail-link:hover::before,
  .page-about .voyage__rail-link:focus-visible::before {
    width: 18px;
    background: var(--sun);
  }

  .page-about .network__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .clients__grid {
    grid-template-columns: 4fr 8fr;
  }

  .page-about .about-next__panel {
    grid-template-columns: 5fr 7fr;
    gap: 56px;
  }

  .page-about .role-flow {
    margin-left: 104px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-voyage__figure {
    margin-left: calc(var(--about-rail-w) + 40px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-item,
  .page-about .partner-item,
  .page-about .badge,
  .page-about .next-link,
  .page-about .voyage__rail-link {
    transition: none;
  }

  .page-about .role-item:hover,
  .page-about .partner-item:hover,
  .page-about .badge:hover,
  .page-about .next-link:hover {
    transform: none;
  }
}
</final>
</PAGE_CSS>