.page-about {
  --about-line: rgba(11, 31, 51, .16);
  --about-line-soft: rgba(11, 31, 51, .09);
  --about-card: #FAF8F2;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 26px;
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 22px;
  padding-bottom: 48px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.18;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .about-hero__lead .lede {
  max-width: 34em;
  color: var(--ink-soft);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 24px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-about .about-hero__figure .media-frame__inner {
  border: 1px solid var(--about-line);
  border-radius: var(--r);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

/* ---------- 时间轨 ---------- */
.page-about .about-track {
  padding-top: 48px;
  padding-bottom: 52px;
}

.page-about .about-track .section__head .lede {
  color: var(--ink-soft);
}

.page-about .about-tl {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding-bottom: 30px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 40px;
  bottom: 0;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl__item:last-child::before {
  display: none;
}

.page-about .about-tl__marker {
  position: relative;
}

.page-about .about-tl__num {
  position: sticky;
  top: 96px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 32px;
  background: var(--ink);
  color: var(--gold);
  border-radius: var(--r-s);
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__body {
  padding-top: 3px;
  border-top: 1px solid var(--about-line-soft);
  padding-bottom: 4px;
}

.page-about .about-tl__title {
  margin: 12px 0 8px;
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 36em;
  color: var(--ink-soft);
  line-height: 1.75;
}

/* ---------- 三级复核（深色区） ---------- */
.page-about .about-flow {
  background: var(--ink);
  color: var(--cream);
  padding-top: 60px;
  padding-bottom: 60px;
  position: relative;
  overflow: hidden;
}

.page-about .about-flow::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(46, 110, 158, .16) 0 2px, transparent 2px 12px);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-flow > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-flow .section__title {
  color: var(--cream);
}

.page-about .about-flow .lede {
  color: var(--cream-72);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--line-dark);
  border-radius: var(--r);
  background: rgba(244, 241, 233, .05);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-flow__step:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
  background: rgba(244, 241, 233, .09);
}

.page-about .about-flow__step:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  box-shadow: inset 0 0 0 1px var(--ink);
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow__title {
  margin: 10px 0 10px;
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cream-72);
}

/* ---------- 六主题 ---------- */
.page-about .about-topics {
  padding-top: 52px;
  padding-bottom: 48px;
}

.page-about .about-topics .section__head .lede {
  color: var(--ink-soft);
}

.page-about .about-topics__figure {
  margin: 34px 0 0;
}

.page-about .about-topics__figure .media-frame__inner {
  border: 1px solid var(--about-line);
  border-radius: var(--r);
  overflow: hidden;
}

.page-about .about-topics__grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-topic {
  position: relative;
  padding: 26px 18px 22px;
  background: var(--about-card);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-topic::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--tone, var(--tile));
}

.page-about .about-topic:hover {
  transform: translateY(-3px);
  border-color: var(--about-line);
}

.page-about .about-topic:nth-child(1) { --tone: var(--tile); }
.page-about .about-topic:nth-child(2) { --tone: var(--jade); }
.page-about .about-topic:nth-child(3) { --tone: var(--gold); }
.page-about .about-topic:nth-child(4) { --tone: var(--rose); }
.page-about .about-topic:nth-child(5) { --tone: var(--harbor); }
.page-about .about-topic:nth-child(6) { --tone: var(--mist); }

.page-about .about-topic__num {
  display: block;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--tone, var(--tile));
  font-variant-numeric: tabular-nums;
}

.page-about .about-topic__name {
  margin: 8px 0 10px;
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--brown);
}

.page-about .about-topic__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 合作方 ---------- */
.page-about .about-partners {
  padding-top: 50px;
  padding-bottom: 50px;
}

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: start;
}

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

.page-about .about-partners__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-partners__item {
  padding: 9px 15px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-pill);
  background: var(--about-card);
  font-size: 14px;
  color: var(--brown);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-partners__item:hover {
  border-color: var(--tile);
  color: var(--tile);
}

.page-about .about-partners__note {
  margin: 22px 0 20px;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

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

.page-about .about-partners__figure .media-frame__inner {
  border: 1px solid var(--about-line);
  border-radius: var(--r);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

/* ---------- 推送节奏 ---------- */
.page-about .about-rhythm {
  padding-top: 50px;
  padding-bottom: 46px;
}

.page-about .about-rhythm .section__head .lede {
  color: var(--ink-soft);
}

.page-about .about-rhythm__cards {
  margin-top: 30px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-rhythm__card {
  padding: 22px 20px 24px;
  border: 1px solid var(--about-line-soft);
  border-left: 3px solid var(--tone, var(--tile));
  border-radius: 0 var(--r) var(--r) 0;
  background: var(--about-card);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rhythm__card:hover {
  transform: translateY(-2px);
  border-color: var(--about-line);
  border-left-color: var(--tone, var(--tile));
}

.page-about .about-rhythm__card--daily { --tone: var(--jade); }
.page-about .about-rhythm__card--weekly { --tone: var(--gold); }
.page-about .about-rhythm__card--issue { --tone: var(--rose); }

.page-about .about-rhythm__key {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--tone, var(--tile));
}

.page-about .about-rhythm__title {
  margin: 10px 0 8px;
  font-size: 17px;
  letter-spacing: .03em;
  color: var(--brown);
}

.page-about .about-rhythm__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-recog {
  list-style: none;
  margin: 36px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--about-line-soft);
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-recog__item {
  display: grid;
  gap: 4px;
}

.page-about .about-recog__num {
  font-family: var(--f-mono);
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-recog__label {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ---------- 调整记录 ---------- */
.page-about .about-log {
  padding-top: 44px;
  padding-bottom: 46px;
}

.page-about .about-log__accordion {
  margin-top: 28px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-top: 10px;
  padding-bottom: 64px;
}

.page-about .about-cta__panel {
  padding: 34px 24px 36px;
  border-radius: var(--r-l);
  display: grid;
  gap: 24px;
}

.page-about .about-cta__title {
  margin: 10px 0 12px;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.3;
  letter-spacing: .04em;
  color: var(--cream);
}

.page-about .about-cta__lede {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cream-72);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-topics__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .about-rhythm__cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

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

  .page-about .about-cta__panel {
    padding: 44px 40px 46px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 30px;
    padding-bottom: 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 52px;
  }

  .page-about .about-tl__item {
    grid-template-columns: 56px 1fr;
    gap: 24px;
    padding-bottom: 38px;
  }

  .page-about .about-tl__item::before {
    left: 27px;
    top: 46px;
  }

  .page-about .about-tl__num {
    width: 56px;
    height: 38px;
    font-size: 14px;
  }

  .page-about .about-flow__steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: stretch;
  }

  .page-about .about-flow__step + .about-flow__step::before {
    content: "";
    position: absolute;
    left: -21px;
    top: 30px;
    width: 11px;
    height: 11px;
    border-top: 1px solid var(--gold);
    border-right: 1px solid var(--gold);
    transform: rotate(45deg);
  }

  .page-about .about-topics__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 30px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .about-cta__panel {
    grid-template-columns: 1.35fr .9fr;
    align-items: center;
    gap: 36px;
    padding: 52px 48px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* ---------- 大屏 ---------- */
@media (min-width: 1200px) {
  .page-about .about-hero__grid {
    gap: 64px;
  }

  .page-about .about-topic {
    padding: 28px 22px 26px;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-topic,
  .page-about .about-flow__step,
  .page-about .about-rhythm__card,
  .page-about .about-partners__item {
    transition: opacity var(--dur) linear;
  }

  .page-about .about-topic:hover,
  .page-about .about-flow__step:hover,
  .page-about .about-rhythm__card:hover {
    transform: none;
  }
}