.page-about {
  --about-dot: 15px;
  --about-gutter: 30px;
  background: var(--mist);
  color: var(--ink);
  font-family: var(--f-body);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑上下文 ---------- */
.page-about .about-crumb {
  padding-top: 28px;
}
.page-about .about-crumb__note {
  margin: 10px 0 0;
  font-family: var(--f-serif);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-faint);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 40px 0 64px;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}
.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(28px, 7vw, 46px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--lake-deep);
}
.page-about .about-hero .lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-soft);
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-about .about-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.page-about .about-hero__meta strong {
  font-family: var(--f-mono);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--lake-deep);
}
.page-about .about-hero__meta span {
  font-size: 13px;
  color: var(--ink-faint);
}
.page-about .about-hero__media {
  margin: 0;
  border-left: 3px solid var(--orange);
  padding-left: 16px;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: var(--paper);
}
.page-about .about-hero__media figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-faint);
}

/* ---------- 长期负责的三件事 ---------- */
.page-about .about-work {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-work__head .lede {
  max-width: 58ch;
}
.page-about .about-work__list {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
}
.page-about .about-work__item {
  position: relative;
  padding: 28px 0 28px 46px;
  border-top: 1px solid var(--line);
}
.page-about .about-work__item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .about-work__num {
  position: absolute;
  left: 0;
  top: 30px;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}
.page-about .about-work__item h3 {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 22px);
  line-height: 1.4;
  color: var(--lake-deep);
}
.page-about .about-work__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 四个小组（深色整幅） ---------- */
.page-about .about-crew {
  background: var(--ink);
  color: var(--on-deep);
  padding: 60px 0;
}
.page-about .about-crew__inner {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: 0 var(--gut);
}
.page-about .about-crew .eyebrow {
  color: var(--glow);
}
.page-about .about-crew h2 {
  margin: 14px 0 16px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.36;
  color: var(--mist);
}
.page-about .about-crew__head p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-deep);
}
.page-about .about-crew__figure {
  margin: 36px 0 0;
  padding: 14px;
  border: 1px solid var(--hair-deep);
  background: rgba(246, 248, 247, 0.04);
}
.page-about .about-crew__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}
.page-about .about-crew__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--on-deep-faint);
}
.page-about .about-crew__list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hair-deep);
  border: 1px solid var(--hair-deep);
}
.page-about .about-crew__card {
  background: var(--ink);
  padding: 24px 20px;
  border-left: 3px solid transparent;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-crew__card:nth-child(1) { border-left-color: var(--jade); }
.page-about .about-crew__card:nth-child(2) { border-left-color: var(--orange); }
.page-about .about-crew__card:nth-child(3) { border-left-color: var(--glow); }
.page-about .about-crew__card:nth-child(4) { border-left-color: var(--lake); }
.page-about .about-crew__card:hover {
  background: rgba(14, 76, 107, 0.42);
}
.page-about .about-crew__tag {
  display: block;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--glow);
}
.page-about .about-crew__card h3 {
  margin: 12px 0 10px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--mist);
}
.page-about .about-crew__card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--on-deep-faint);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: 60px 0;
}
.page-about .about-timeline__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: end;
}
.page-about .about-timeline__headtext .lede {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-timeline__figure {
  margin: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--paper);
}
.page-about .about-timeline__figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-faint);
}

.page-about .about-stage__list {
  position: relative;
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
}
.page-about .about-stage__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}
.page-about .about-stage {
  position: relative;
  padding: 0 0 38px var(--about-gutter);
}
.page-about .about-stage:last-child {
  padding-bottom: 0;
}
.page-about .about-stage__dot {
  position: absolute;
  left: 0;
  top: 9px;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--mist);
  border: 2px solid var(--jade);
  z-index: 1;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-stage:last-child .about-stage__dot {
  background: var(--jade);
  border-color: var(--jade);
  box-shadow: 0 0 0 4px rgba(42, 133, 120, 0.16);
}
.page-about .about-stage__axis {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}
.page-about .about-stage__ver {
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--jade);
}
.page-about .about-stage__label {
  font-family: var(--f-serif);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-faint);
}
.page-about .about-stage__body {
  border-left: 3px solid var(--lake-deep);
  padding: 2px 0 2px 18px;
}
.page-about .about-stage:nth-child(2) .about-stage__body { border-left-color: var(--orange); }
.page-about .about-stage:nth-child(3) .about-stage__body { border-left-color: var(--lake); }
.page-about .about-stage:nth-child(4) .about-stage__body { border-left-color: var(--jade); }
.page-about .about-stage__body h3 {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  color: var(--lake-deep);
}
.page-about .about-stage__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}
.page-about .about-reach__text h2 {
  margin: 14px 0 18px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 28px);
  line-height: 1.4;
  color: var(--lake-deep);
}
.page-about .about-reach__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .about-reach__text p:last-child {
  margin-bottom: 0;
}
.page-about .about-reach__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-reach__stats li {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-reach__stats li:first-child {
  border-top: none;
}
.page-about .about-reach__stats strong {
  display: block;
  font-family: var(--f-mono);
  font-size: clamp(26px, 6vw, 34px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--lake-deep);
}
.page-about .about-reach__stats span {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 日常节奏 ---------- */
.page-about .about-rhythm {
  padding: 56px 0;
}
.page-about .about-rhythm__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 40px;
}
.page-about .about-rhythm__item {
  border-top: 2px solid var(--orange);
  padding: 22px 0 0;
}
.page-about .about-rhythm__item:nth-child(2) { border-top-color: var(--lake-deep); }
.page-about .about-rhythm__item:nth-child(3) { border-top-color: var(--jade); }
.page-about .about-rhythm__item h3 {
  margin: 0 0 10px;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
  color: var(--lake-deep);
}
.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: 56px 0 88px;
  border-top: 1px solid var(--line);
}
.page-about .about-close__inner {
  max-width: var(--wrap-narrow);
  margin: 0 auto;
  padding: 0 var(--gut);
}
.page-about .about-close h2 {
  margin: 14px 0 18px;
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.32;
  color: var(--lake-deep);
}
.page-about .about-close p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-soft);
}
.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: 28px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about {
    --about-gutter: 46px;
  }
  .page-about .about-crumb {
    padding-top: 36px;
  }
  .page-about .about-hero {
    padding: 64px 0 88px;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
  }
  .page-about .about-hero__media {
    margin-top: 44px;
  }
  .page-about .about-work {
    padding: 84px 0;
  }
  .page-about .about-work__list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 52px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .page-about .about-work__item {
    border-top: none;
    border-bottom: none;
    padding: 34px 30px 34px 0;
  }
  .page-about .about-work__item:last-child {
    border-bottom: none;
  }
  .page-about .about-work__item + .about-work__item {
    border-left: 1px solid var(--line);
    padding-left: 30px;
  }
  .page-about .about-work__num {
    position: static;
    display: block;
    margin-bottom: 18px;
  }
  .page-about .about-crew {
    padding: 84px 0 88px;
  }
  .page-about .about-crew__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-timeline {
    padding: 84px 0;
  }
  .page-about .about-timeline__head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }
  .page-about .about-stage__list {
    margin-top: 60px;
  }
  .page-about .about-stage {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding-bottom: 52px;
  }
  .page-about .about-stage__axis {
    margin-bottom: 0;
    padding-top: 2px;
  }
  .page-about .about-stage__dot {
    top: 8px;
  }
  .page-about .about-reach {
    padding: 84px 0;
  }
  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 72px;
    align-items: start;
  }
  .page-about .about-reach__stats {
    margin-top: 8px;
  }
  .page-about .about-rhythm {
    padding: 84px 0;
  }
  .page-about .about-rhythm__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
    margin-top: 48px;
  }
  .page-about .about-close {
    padding: 80px 0 104px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-crew__inner {
    padding-left: 0;
    padding-right: 0;
  }
}

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