.page-about {
  --about-ink-soft: #7C6A5A;
  --about-body-soft: #453A31;
  --about-node-gap: 96px;
  background: var(--c-abyss);
  color: var(--c-text);
  overflow-x: hidden;
}

.page-about h2 {
  margin: 0;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.025em;
  font-weight: 800;
}

.page-about h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: -0.015em;
  font-weight: 700;
}

/* ---------- 头部首屏：奶油纸 ---------- */

.page-about .about-hero {
  background: var(--c-paper);
  color: var(--c-ink);
  padding: 24px 0 56px;
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__current,
.page-about .about-hero .breadcrumb__sep {
  color: var(--about-ink-soft);
}

.page-about .about-hero .breadcrumb__link {
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: color .2s var(--ease), text-decoration-color .2s var(--ease);
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--c-coral);
  text-decoration-color: var(--c-coral);
}

.page-about .about-hero__kicker {
  color: var(--about-ink-soft);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.035em;
  font-weight: 800;
  max-width: 16ch;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--about-body-soft);
}

.page-about .about-hero__mark {
  position: relative;
  background: var(--c-abyss);
  padding: 26px 22px 22px;
  overflow: hidden;
  align-self: end;
}

.page-about .about-hero__mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: .42;
  pointer-events: none;
}

.page-about .about-hero__vnum {
  position: relative;
  z-index: 1;
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(72px, 17vw, 126px);
  font-weight: 700;
  line-height: .84;
  letter-spacing: -0.045em;
  color: var(--c-coral);
}

.page-about .about-hero__vcap {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-fog);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  background: #DCD1C1;
  border: 1px solid #DCD1C1;
}

.page-about .about-hero__fact {
  margin: 0;
  padding: 14px 16px 16px;
  background: var(--c-paper);
}

.page-about .about-hero__fact dt {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--about-ink-soft);
}

.page-about .about-hero__fact dd {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-right: 5px;
}

/* ---------- 通用章节头 ---------- */

.page-about .about-sec-head {
  max-width: 720px;
  margin-bottom: 36px;
}

.page-about .about-sec-head h2 {
  margin-top: 14px;
}

.page-about .about-sec-head--tight {
  margin-bottom: 28px;
}

.page-about .about-sec-head__lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-fog);
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin {
  padding: 56px 0;
  border-bottom: 1px solid var(--c-grid-dim);
}

.page-about .about-origin__inner {
  display: grid;
  gap: 16px;
}

.page-about .about-origin__num {
  color: var(--c-fog-dim);
}

.page-about .about-origin__copy h2 {
  margin-bottom: 20px;
  max-width: 22ch;
}

.page-about .about-origin__copy .prose {
  margin: 0 0 18px;
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--c-text);
}

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

/* ---------- 02 版本沿革 ---------- */

.page-about .about-milestones {
  padding: 56px 0;
}

.page-about .about-milestones__fig {
  margin: 0 0 48px;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 40px;
  display: grid;
  gap: var(--about-node-gap);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--c-grid);
}

.page-about .about-timeline__node {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 28px;
  left: -34px;
  width: 9px;
  height: 9px;
  background: var(--c-abyss);
  border: 1px solid var(--c-fog-dim);
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-within,
.page-about .about-timeline__node:target {
  border-color: var(--c-coral);
  background: #10304F;
}

.page-about .about-timeline__node:hover::before,
.page-about .about-timeline__node:focus-within::before,
.page-about .about-timeline__node:target::before {
  border-color: var(--c-coral);
  background: var(--c-coral);
}

.page-about .about-timeline__anchor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.page-about .about-timeline__anchor:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 4px;
}

.page-about .about-timeline__num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-coral);
}

.page-about .about-timeline__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-text);
}

.page-about .about-timeline__body {
  margin-top: 12px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-fog);
}

.page-about .about-timeline__body p {
  margin: 0;
}

.page-about .about-timeline__note {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  transition: grid-template-rows .32s var(--ease);
}

.page-about .about-timeline__note > p {
  min-height: 0;
  margin: 0;
  padding-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-fog-dim);
  border-top: 1px solid transparent;
  transition: border-color .32s var(--ease);
}

.page-about .about-timeline__node:hover .about-timeline__note,
.page-about .about-timeline__node:focus-within .about-timeline__note,
.page-about .about-timeline__node:target .about-timeline__note {
  grid-template-rows: 1fr;
}

.page-about .about-timeline__node:hover .about-timeline__note > p,
.page-about .about-timeline__node:focus-within .about-timeline__note > p,
.page-about .about-timeline__node:target .about-timeline__note > p {
  border-top-color: var(--c-grid);
}

/* ---------- 03 值守分工 ---------- */

.page-about .about-team {
  padding: 56px 0;
  background: var(--c-panel);
  border-top: 1px solid var(--c-grid);
  border-bottom: 1px solid var(--c-grid);
}

.page-about .about-team__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .about-team__role {
  margin: 0;
  padding: 18px 20px 20px;
  background: var(--c-panel);
  transition: background-color .25s var(--ease);
}

.page-about .about-team__role:hover {
  background: #10304F;
}

.page-about .about-team__role-name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--c-coral-soft);
}

.page-about .about-team__role-desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-fog);
  max-width: 48ch;
}

.page-about .about-team__foot {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-mint);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
  max-width: 48ch;
}

.page-about .about-team__fig {
  margin: 0;
}

/* ---------- 04 复核节奏：奶油纸 ---------- */

.page-about .about-review {
  padding: 56px 0;
  background: var(--c-paper);
  color: var(--c-ink);
}

.page-about .about-review__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-review__fig {
  margin: 0;
}

.page-about .about-review__kicker {
  color: var(--about-ink-soft);
}

.page-about .about-review__copy h2 {
  margin-top: 14px;
  max-width: 20ch;
}

.page-about .about-review__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--about-body-soft);
}

.page-about .about-review__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  max-width: 62ch;
}

.page-about .about-review__list li {
  position: relative;
  padding-left: 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body-soft);
}

.page-about .about-review__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 13px;
  height: 1px;
  background: var(--c-coral);
}

/* ---------- 05 服务对象 ---------- */

.page-about .about-audience {
  padding: 56px 0;
}

.page-about .about-audience__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-audience__item {
  display: flex;
  flex-direction: column;
  padding: 24px 22px 26px;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
  border-top: 2px solid var(--c-grid);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-audience__item:hover {
  border-top-color: var(--c-coral);
}

.page-about .about-audience__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--c-fog-dim);
}

.page-about .about-audience__title {
  margin-top: 20px;
  color: var(--c-text);
}

.page-about .about-audience__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-fog);
}

.page-about .about-audience__link {
  margin-top: 22px;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-coral);
  text-decoration: none;
  border-bottom: 1px solid var(--c-grid);
  padding-bottom: 3px;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-audience__link:hover,
.page-about .about-audience__link:focus-visible {
  color: var(--c-coral-soft);
  border-bottom-color: var(--c-coral-soft);
}

.page-about .about-audience__link:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 3px;
}

.page-about .about-audience__more {
  margin: 28px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-fog);
  max-width: 60ch;
}

.page-about .about-audience__more a {
  color: var(--c-coral-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-audience__more a:hover,
.page-about .about-audience__more a:focus-visible {
  color: var(--c-coral);
}

/* ---------- 06 下一步 ---------- */

.page-about .about-next {
  padding: 56px 0 72px;
  background: var(--c-panel);
  border-top: 1px solid var(--c-grid);
}

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

.page-about .about-next__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 22px 20px 24px;
  background: var(--c-panel);
  transition: background-color .25s var(--ease);
}

.page-about .about-next__item:hover {
  background: #10304F;
}

.page-about .about-next__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-coral);
  padding-top: 4px;
}

.page-about .about-next__body h3 {
  color: var(--c-text);
}

.page-about .about-next__body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-fog);
  max-width: 58ch;
}

/* 图片响应式兜底 */
.page-about .fig-frame__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 40px 0 76px;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 52px;
  }

  .page-about .about-origin,
  .page-about .about-milestones,
  .page-about .about-team,
  .page-about .about-review,
  .page-about .about-audience,
  .page-about .about-next {
    padding: 80px 0;
  }

  .page-about .about-timeline {
    padding-left: 64px;
  }

  .page-about .about-timeline::before {
    left: 14px;
  }

  .page-about .about-timeline__node {
    padding: 26px 28px 28px;
  }

  .page-about .about-timeline__node::before {
    top: 34px;
    left: -54px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    gap: 48px;
    align-items: end;
    margin-top: 44px;
  }

  .page-about .about-origin__inner {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 0 48px;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-review__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-about .about-timeline {
    gap: 96px;
  }

  .page-about .about-hero__lead {
    font-size: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__note {
    transition: none;
  }

  .page-about .about-timeline__note > p,
  .page-about .about-timeline__node,
  .page-about .about-audience__item,
  .page-about .about-team__role,
  .page-about .about-next__item {
    transition: none;
  }
}