.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 36px) 0 clamp(30px, 5vw, 60px);
  border-bottom: var(--border);
  background-image:
    linear-gradient(to right, rgba(18, 112, 127, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(18, 112, 127, 0.09) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: -1px -1px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(18px, 3vw, 32px);
}

.page-about .about-hero__title {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 86px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 12px 0 20px;
  max-width: 16em;
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.85;
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero__rail {
  border: var(--border);
  background: var(--paper);
  box-shadow: var(--shadow-hard-sm);
  padding: 18px 18px 20px;
}

.page-about .about-hero__readout {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--teal);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(139, 135, 155, 0.55);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__stat-num {
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 700;
  color: var(--teal);
  white-space: nowrap;
}

.page-about .about-hero__stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
  opacity: 0.82;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: clamp(40px, 7vw, 88px) 0;
  border-bottom: 1px solid rgba(139, 135, 155, 0.5);
}

.page-about .about-h2 {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.page-about .lede {
  max-width: 36em;
  margin: 0 0 14px;
}

.page-about .section p {
  max-width: 36em;
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
}

.page-about .about-origin__note {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-left: 3px solid var(--amber);
  padding-left: 14px;
}

.page-about .about-origin__note .section-num {
  color: var(--teal);
  margin: 0;
}

.page-about .about-origin__note .note {
  margin: 0;
  color: var(--survey);
  font-size: 12px;
  letter-spacing: 0.03em;
}

.page-about .about-origin__body p {
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 18px 20px;
  font-family: var(--f-serif);
  font-size: clamp(17px, 2.6vw, 22px);
  line-height: 1.7;
  color: var(--deep);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--mist);
  max-width: 34em;
}

/* ---------- 02 分工 ---------- */
.page-about .about-crew__head p {
  margin-bottom: 0;
}

.page-about .about-crew__figure {
  margin: 26px 0 0;
}

.page-about .about-crew__figure .figure__img,
.page-about .about-path__figure .figure__img,
.page-about .about-nodes__figure .figure__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-crew__figure .figure__caption,
.page-about .about-path__figure .figure__caption,
.page-about .about-nodes__figure .figure__caption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--survey);
  margin-top: 10px;
}

.page-about .about-crew__cards {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.page-about .about-crew__card {
  border: var(--border);
  box-shadow: var(--shadow-hard-sm);
  padding: 20px 20px 22px;
  transition: transform 200ms ease, box-shadow 200ms ease;
  outline: none;
}

.page-about .about-crew__card:hover,
.page-about .about-crew__card:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-about .about-crew__card--tech {
  background: var(--teal);
  color: var(--paper);
}

.page-about .about-crew__card--content {
  background: var(--mist);
  color: var(--ink);
}

.page-about .about-crew__card--service {
  background: var(--purple);
  color: var(--paper);
}

.page-about .about-crew__num {
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--amber);
}

.page-about .about-crew__card--content .about-crew__num {
  color: var(--deep);
}

.page-about .about-crew__title {
  font-family: var(--f-display);
  font-size: 21px;
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: 0.02em;
}

.page-about .about-crew__text {
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  max-width: none;
}

.page-about .about-crew__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  transition: max-height 220ms ease, opacity 180ms ease, margin-top 220ms ease;
  border-top: 1px dashed rgba(244, 237, 223, 0.6);
}

.page-about .about-crew__card--content .about-crew__more {
  border-top-color: rgba(21, 20, 42, 0.35);
}

.page-about .about-crew__card:hover .about-crew__more,
.page-about .about-crew__card:focus-visible .about-crew__more,
.page-about .about-crew__card:focus-within .about-crew__more {
  max-height: 12em;
  opacity: 1;
  margin-top: 12px;
  padding-top: 12px;
}

/* ---------- 03 路径 ---------- */
.page-about .about-path__steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-path__steps::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-image: linear-gradient(to bottom, var(--ink) 0 8px, transparent 8px 16px);
  background-size: 2px 16px;
  background-repeat: repeat-y;
}

.page-about .about-path__step {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-path__step::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--amber);
  border: 2px solid var(--ink);
}

.page-about .about-path__step::after {
  content: "";
  position: absolute;
  left: -20px;
  top: 11px;
  width: 22px;
  height: 2px;
  background: var(--ink);
  opacity: 0.5;
}

.page-about .about-path__tag {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
  margin: 0 0 6px;
}

.page-about .about-path__title {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .about-path__text {
  font-size: 15px;
  line-height: 1.85;
  margin: 0;
  max-width: 34em;
}

.page-about .about-path__figure {
  margin: 30px 0 0;
}

/* ---------- 04 节点 ---------- */
.page-about .about-nodes__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-nodes__body p {
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 14px;
}

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

.page-about .about-nodes__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-nodes__item {
  border: var(--border);
  background: var(--mist);
  padding: 12px 14px;
  display: grid;
  gap: 4px;
  transition: background-color 180ms ease, border-color 180ms ease;
}

.page-about .about-nodes__item:hover {
  background: var(--amber-pale);
  border-color: var(--deep);
}

.page-about .about-nodes__code {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--deep);
}

.page-about .about-nodes__name {
  font-family: var(--f-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.2;
}

.page-about .about-nodes__meta {
  font-size: 12px;
  color: var(--survey);
}

/* ---------- 05 节拍 ---------- */
.page-about .about-rhythm__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink);
  border: var(--border);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-rhythm__item {
  background: var(--paper);
  padding: 18px 16px 20px;
  display: grid;
  gap: 6px;
}

.page-about .about-rhythm__num {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--teal);
  white-space: nowrap;
}

.page-about .about-rhythm__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink);
  opacity: 0.85;
}

.page-about .about-rhythm__foot {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.85;
  max-width: 38em;
}

.page-about .about-rhythm__foot a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-rhythm__foot a:hover {
  color: var(--deep);
}

/* ---------- 06 承诺 ---------- */
.page-about .about-promise {
  border-bottom: none;
}

.page-about .about-promise__panel {
  border: var(--border);
  box-shadow: var(--shadow-hard);
  background: var(--purple);
  color: var(--paper);
  display: grid;
  gap: 0;
}

.page-about .about-promise__main {
  padding: clamp(22px, 4vw, 40px);
}

.page-about .about-promise__title {
  font-family: var(--f-display);
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 12px;
}

.page-about .about-promise__lede {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  opacity: 0.9;
  max-width: 32em;
}

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

.page-about .about-promise__list li {
  font-size: 15px;
  line-height: 1.75;
  padding-left: 16px;
  position: relative;
  max-width: 34em;
}

.page-about .about-promise__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--amber);
  border: 2px solid var(--ink);
}

.page-about .about-promise__list .mono {
  color: var(--amber);
  font-weight: 700;
  margin-right: 4px;
}

.page-about .about-promise__actions {
  margin-top: 24px;
}

.page-about .about-promise__aside {
  padding: clamp(20px, 4vw, 34px);
  background: var(--ink);
  border-top: var(--border);
}

.page-about .about-promise__aside-title {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  margin: 0 0 14px;
}

.page-about .about-promise__contact {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.6;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: baseline;
}

.page-about .about-promise__contact a {
  color: var(--paper);
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-all;
}

.page-about .about-promise__contact a:hover {
  color: var(--amber);
}

.page-about .about-promise__key {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--survey);
  border: 1px solid var(--survey);
  padding: 1px 5px;
  white-space: nowrap;
}

.page-about .about-promise__hours {
  font-size: 13px;
  color: var(--mist);
  margin: 12px 0 12px;
}

.page-about .about-promise__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  margin: 0 0 16px;
  max-width: 30em;
}

.page-about .about-promise__badges {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 桌面增强 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.9fr) minmax(220px, 0.8fr);
    align-items: start;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 52px);
  }

  .page-about .about-crew__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-nodes__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-rhythm__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-promise__panel {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-promise__aside {
    border-top: none;
    border-left: var(--border);
  }
}

@media (min-width: 980px) {
  .page-about .about-path__steps {
    padding-left: 46px;
  }

  .page-about .about-path__steps::before {
    left: 11px;
  }

  .page-about .about-path__step {
    padding-bottom: 38px;
  }

  .page-about .about-path__step::before {
    left: -46px;
    width: 20px;
    height: 20px;
  }

  .page-about .about-path__step::after {
    left: -30px;
    top: 14px;
    width: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__card,
  .page-about .about-crew__more,
  .page-about .about-nodes__item {
    transition-duration: 0ms;
  }
}
<<<PAGE_CSS_END>>>