.page-about {
  --abt-serif: var(--font-serif);
  --abt-mono: var(--font-mono);
  --abt-gap: 1.5rem;
  --abt-spine: 176px;
  color: var(--ink);
}

/* ---------- 容器 ---------- */
.page-about .about-shell {
  width: 100%;
  max-width: var(--w);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-block: 1.25rem 0;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--abt-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--stone);
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: .5rem;
  color: var(--line-strong);
}
.page-about .breadcrumb__link {
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  border-bottom-color: var(--celadon);
}
.page-about .breadcrumb__current {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 2rem 3rem;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(168, 196, 188, 0.22) 0%, rgba(246, 242, 234, 0) 58%),
    var(--rice);
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}
.page-about .about-hero__title {
  font-family: var(--abt-serif);
  font-weight: 700;
  font-size: clamp(2rem, 7.4vw, 3.6rem);
  line-height: 1.18;
  letter-spacing: .01em;
  margin: .75rem 0 0;
  max-width: 18ch;
}
.page-about .about-hero__lede {
  margin-top: 1.25rem;
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-hero__art svg {
  display: block;
  width: 100%;
  max-width: 380px;
  height: auto;
  margin-inline: auto;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-stat {
  background: var(--rice);
  padding: 1rem 1.05rem;
}
.page-about .about-stat__label {
  font-size: .8125rem;
  color: var(--stone);
  letter-spacing: .02em;
  margin: 0 0 .45rem;
}
.page-about .about-stat__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: .3rem;
  flex-wrap: wrap;
}
.page-about .about-stat__num {
  font-family: var(--abt-mono);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1;
  color: var(--celadon);
  font-variant-numeric: tabular-nums;
}
.page-about .about-stat__unit {
  font-size: .8125rem;
  color: var(--ink);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-band {
  border-bottom: 1px solid var(--line);
}
.page-about .about-band--tint {
  background: linear-gradient(180deg, rgba(168, 196, 188, 0.20) 0%, rgba(246, 242, 234, 0) 82%);
}
.page-about .split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding-block: 2.75rem;
}

/* ---------- 窄栏刻度 ---------- */
.page-about .spine {
  display: flex;
  align-items: baseline;
  gap: .75rem;
}
.page-about .spine__num {
  font-family: var(--abt-mono);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--cinnabar);
}
.page-about .spine__label {
  font-family: var(--abt-mono);
  font-size: .75rem;
  letter-spacing: .28em;
  color: var(--stone);
}
.page-about .spine--dark .spine__num {
  color: var(--gold);
}
.page-about .spine--dark .spine__label {
  color: rgba(246, 242, 234, 0.62);
}

/* ---------- 标题 ---------- */
.page-about .sec-title {
  font-family: var(--abt-serif);
  font-weight: 700;
  font-size: clamp(1.55rem, 4.6vw, 2.4rem);
  line-height: 1.3;
  letter-spacing: .01em;
  margin: 0;
  max-width: 22ch;
}
.page-about .sec-title--dark {
  color: var(--rice);
}
.page-about .sec-lede {
  margin: .9rem 0 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .sec-lede--dark {
  color: rgba(246, 242, 234, 0.82);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 1.75rem 0 0;
}
.page-about .about-figure--tight {
  margin-top: 1.5rem;
}
.page-about .about-figure--wide {
  margin-top: 2.25rem;
}
.page-about .about-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--rice-2);
  object-fit: cover;
}
.page-about .about-figure__cap {
  margin: .6rem 0 0;
  font-family: var(--abt-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--stone);
  line-height: 1.6;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  position: relative;
}
.page-about .timeline__item {
  position: relative;
  padding: 1.25rem 0 1.25rem 1.6rem;
  border-left: 1px solid var(--line-strong);
}
.page-about .timeline__item:last-child {
  padding-bottom: 0;
}
.page-about .timeline__dot {
  position: absolute;
  left: -5px;
  top: 1.65rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--rice);
}
.page-about .timeline__step {
  margin: 0;
  font-family: var(--abt-mono);
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--cinnabar);
}
.page-about .timeline__title {
  font-family: var(--abt-serif);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin: .4rem 0 .6rem;
}
.page-about .timeline__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .timeline__extra {
  margin: .75rem 0 0;
  padding-top: .75rem;
  border-top: 1px dashed var(--line);
  font-size: .84rem;
  line-height: 1.75;
  color: var(--stone);
}
.page-about .timeline__item {
  transition: border-color .25s ease;
}
.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within {
  border-left-color: var(--celadon);
}
.page-about .timeline__item:hover .timeline__dot,
.page-about .timeline__item:focus-within .timeline__dot {
  background: var(--cinnabar);
}

/* ---------- 服务网格 ---------- */
.page-about .svc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .svc {
  background: var(--rice);
  padding: 1.35rem 1.25rem 1.5rem;
  transition: background .25s ease, box-shadow .25s ease;
}
.page-about .svc:hover {
  background: #fff;
  box-shadow: inset 3px 0 0 var(--celadon);
}
.page-about .svc__idx {
  display: block;
  font-family: var(--abt-mono);
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: .6rem;
}
.page-about .svc__name {
  font-family: var(--abt-serif);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0 0 .5rem;
}
.page-about .svc__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .svc__fit {
  margin: .75rem 0 0;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--celadon);
  border-top: 1px solid var(--line);
  padding-top: .6rem;
}

/* ---------- 团队数据条 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}
.page-about .team-bar {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) 3.5rem;
  align-items: center;
  gap: .75rem;
  padding: .35rem .4rem;
  border: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease;
}
.page-about .team-bar:hover {
  border-color: var(--line);
  background: rgba(168, 196, 188, 0.14);
}
.page-about .team-bar__name {
  font-size: .875rem;
  color: var(--ink);
}
.page-about .team-bar__track {
  display: block;
  height: 10px;
  background: var(--rice-2);
  border: 1px solid var(--line);
  overflow: hidden;
}
.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--celadon) 0%, var(--celadon-light) 100%);
  transition: width .5s ease;
}
.page-about .team-bar:nth-child(1) .team-bar__fill { width: 53.3%; }
.page-about .team-bar:nth-child(2) .team-bar__fill { width: 23.3%; }
.page-about .team-bar:nth-child(3) .team-bar__fill { width: 13.3%; }
.page-about .team-bar:nth-child(4) .team-bar__fill { width: 10%; }
.page-about .team-bar__num {
  font-family: var(--abt-mono);
  font-size: .84rem;
  font-variant-numeric: tabular-nums;
  color: var(--cinnabar);
  text-align: right;
}

/* ---------- 片区 ---------- */
.page-about .region-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .region {
  background: var(--rice);
  padding: 1.15rem 1.1rem;
}
.page-about .region__name {
  font-family: var(--abt-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  margin: 0 0 .45rem;
  color: var(--celadon);
}
.page-about .region__text {
  margin: 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .note-line {
  margin: 1.5rem 0 0;
  padding-left: .9rem;
  border-left: 2px solid var(--clay);
  font-size: .875rem;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 协作节奏 ---------- */
.page-about .rhythm {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.75rem;
}
.page-about .rhythm__item {
  padding-top: .85rem;
  border-top: 2px solid var(--celadon);
}
.page-about .rhythm__name {
  font-family: var(--abt-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  margin: 0 0 .5rem;
}
.page-about .rhythm__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 深色区块 ---------- */
.page-about .about-band--dark {
  background: var(--ink-green);
  border-bottom-color: rgba(246, 242, 234, 0.14);
}
.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.75rem;
  background: rgba(246, 242, 234, 0.18);
}
.page-about .eco {
  background: var(--ink-green);
  padding: 1.35rem 1.2rem 1.5rem;
}
.page-about .eco__num {
  margin: 0;
  font-family: var(--abt-mono);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.page-about .eco__unit {
  margin: .5rem 0 0;
  font-size: .84rem;
  letter-spacing: .04em;
  color: rgba(246, 242, 234, 0.92);
}
.page-about .eco__text {
  margin: .8rem 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: rgba(246, 242, 234, 0.72);
}

/* ---------- 执行规范 ---------- */
.page-about .process {
  margin-top: 1.75rem;
  border-top: 1px solid var(--line);
}
.page-about .process__row {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}
.page-about .process__idx {
  font-family: var(--abt-mono);
  font-size: .95rem;
  font-weight: 600;
  color: var(--clay);
  line-height: 1.6;
}
.page-about .process__name {
  font-family: var(--abt-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  margin: 0 0 .45rem;
}
.page-about .process__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .assure {
  margin-top: 1.75rem;
  padding: 1.25rem 1.2rem;
  background: rgba(168, 196, 188, 0.22);
  border-left: 3px solid var(--cinnabar);
}
.page-about .assure__item {
  margin: 0;
  font-family: var(--abt-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--cinnabar);
  line-height: 1.2;
}
.page-about .assure__num {
  font-size: 2rem;
}
.page-about .assure__text {
  margin: .6rem 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 行动收束 ---------- */
.page-about .about-cta {
  background:
    linear-gradient(135deg, rgba(63, 111, 99, 0.16) 0%, rgba(201, 162, 39, 0.10) 100%),
    var(--rice-2);
  border-bottom: 1px solid var(--line);
}
.page-about .about-cta__inner {
  padding-block: 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}
.page-about .about-cta__title {
  font-family: var(--abt-serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.4vw, 2.15rem);
  line-height: 1.3;
  margin: .5rem 0 0;
  max-width: 20ch;
}
.page-about .about-cta__text {
  margin: .85rem 0 0;
  max-width: 48ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--ink);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
}

/* ---------- 通用小件 ---------- */
.page-about .linkline {
  margin: 2rem 0 0;
}
.page-about .linkline--dark {
  margin-top: 1.75rem;
}
.page-about .btn--onDark {
  color: rgba(246, 242, 234, 0.92);
  border-color: rgba(246, 242, 234, 0.4);
}
.page-about .btn--onDark:hover,
.page-about .btn--onDark:focus-visible {
  color: var(--ink-green);
  background: var(--rice);
  border-color: var(--rice);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .svc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .region-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem 2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    padding-inline: 2rem;
  }
  .page-about .about-hero {
    padding-block: 2.5rem 4rem;
  }
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(260px, 0.88fr);
    gap: 3.5rem;
    align-items: center;
  }
  .page-about .about-hero__art svg {
    max-width: 100%;
  }
  .page-about .split {
    grid-template-columns: var(--abt-spine) minmax(0, 1fr);
    gap: 3.5rem;
    padding-block: 4.5rem;
  }
  .page-about .spine {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    position: sticky;
    top: 7rem;
  }
  .page-about .spine__num {
    font-size: 2.25rem;
  }
  .page-about .spine__label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .42em;
    padding-block: .2rem;
  }
  .page-about .sec-title {
    max-width: 24ch;
  }
  .page-about .timeline {
    margin-top: 2.75rem;
  }
  .page-about .timeline::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--gold) 0%, rgba(201, 162, 39, 0.28) 62%, rgba(201, 162, 39, 0.08) 100%);
  }
  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2.5rem;
  }
  .page-about .timeline__item {
    border-left: 0;
    padding: 2.5rem 0 0;
  }
  .page-about .timeline__item:last-child {
    padding-bottom: 0;
  }
  .page-about .timeline__dot {
    top: -4px;
    left: 0;
    box-shadow: 0 0 0 3px var(--rice);
  }
  .page-about .svc-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .svc {
    padding: 1.6rem 1.5rem 1.75rem;
  }
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.65fr);
    align-items: center;
    gap: 3rem;
    padding-block: 4rem;
  }
  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about {
    --abt-spine: 208px;
  }
  .page-about .region-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .eco-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .rhythm {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .svc,
  .page-about .team-bar,
  .page-about .team-bar__fill,
  .page-about .timeline__item {
    transition: none;
  }
}
<<<END>>>