.page-about .about-hero {
  position: relative;
  padding: 28px 0 44px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--sig);
  opacity: .9;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-hero__lead h1 {
  font-size: clamp(28px, 7vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--night);
  margin: 10px 0 16px;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 42ch;
  margin: 0 0 22px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .about-fact {
  background: var(--paper-2);
  padding: 16px 14px;
  margin: 0;
}

.page-about .about-fact__k {
  display: block;
  font-size: 26px;
  line-height: 1;
  font-weight: 700;
  color: var(--night);
  margin: 0 0 8px;
}

.page-about .about-fact__u {
  font-size: 12px;
  margin-left: 0.25em;
  color: var(--sig-deep);
}

.page-about .about-fact__v {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ---- 职责四件事 ---- */
.page-about .about-duties {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-duty {
  position: relative;
  background: var(--paper);
  padding: 22px 20px 24px;
  transition: background .24s var(--ease), transform .24s var(--ease);
}

.page-about .about-duty:hover {
  background: var(--paper-2);
  transform: translateY(-3px);
}

.page-about .about-duty__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-size: 12px;
  font-weight: 700;
  color: var(--night);
  background: var(--gold);
  border-radius: 50%;
  margin-bottom: 12px;
}

.page-about .about-duty__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--night);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.page-about .about-duty__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---- 值守运转 ---- */
.page-about .about-shift__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-shift__notes {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-shift__notes li {
  display: grid;
  grid-template-columns: 10px 1fr;
  grid-template-areas:
    "dot key"
    ". val";
  gap: 4px 10px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-shift__notes li .status-dot {
  grid-area: dot;
  margin-top: 7px;
}

.page-about .about-shift__notes strong {
  grid-area: key;
  color: var(--night);
  font-weight: 700;
  font-size: 15px;
}

.page-about .about-shift__notes span:last-child {
  grid-area: val;
}

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

/* ---- 团队编制（深夜蓝章节内） ---- */
.page-about .section--night .section__lede,
.page-about .section--night .about-staff__training {
  color: rgba(242, 245, 247, .78);
}

.page-about .about-staff {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 30px;
}

.page-about .about-staff__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(199, 210, 219, .22);
  border: 1px solid rgba(199, 210, 219, .22);
}

.page-about .about-staff__card {
  background: var(--night-2);
  padding: 22px 20px;
  transition: background .24s var(--ease);
}

.page-about .about-staff__card:hover {
  background: #22456B;
}

.page-about .about-staff__num {
  font-size: 38px;
  line-height: 1;
  font-weight: 700;
  color: var(--sig);
  margin: 0 0 8px;
}

.page-about .about-staff__role {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-staff__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 245, 247, .72);
}

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

.page-about .about-staff__training {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-size: 14.5px;
  line-height: 1.85;
  max-width: 60ch;
}

/* ---- 服务体量 ---- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-metric {
  background: var(--paper-2);
  padding: 24px 20px 26px;
  transition: background .24s var(--ease);
}

.page-about .about-metric:hover {
  background: var(--paper);
}

.page-about .about-metric__num {
  margin: 0 0 10px;
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: var(--night);
  letter-spacing: -0.02em;
}

.page-about .about-metric__unit {
  font-size: 14px;
  font-weight: 500;
  color: var(--sig-deep);
  margin-left: 0.25em;
  letter-spacing: 0;
}

.page-about .about-metric__label {
  margin: 0 0 10px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--night);
  line-height: 1.6;
}

.page-about .about-metric__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---- 版本沿革 ---- */
.page-about .about-timeline__figure {
  margin: 26px 0 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 0;
  border-left: 1px dashed var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 0;
  outline: none;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -22px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--paper-2);
}

.page-about .about-timeline__item:focus-visible .about-timeline__dot {
  box-shadow: 0 0 0 3px var(--sig-soft);
}

.page-about .about-timeline__ver {
  display: inline-block;
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--sig-deep);
  letter-spacing: .02em;
}

.page-about .about-timeline__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--night);
  letter-spacing: -0.01em;
}

.page-about .about-timeline__sum {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 46ch;
}

.page-about .about-timeline__points {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  border-top: 1px dashed var(--line);
}

.page-about .about-timeline__points li {
  position: relative;
  padding: 7px 0 7px 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-timeline__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 6px;
  height: 1px;
  background: var(--sig);
}

/* ---- 资质 ---- */
.page-about .about-creds__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .about-creds {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-cred {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 4px 12px;
  padding: 16px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-cred:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-cred__mark {
  grid-row: 1 / span 2;
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border: 2px solid var(--ok);
  border-radius: 50%;
}

.page-about .about-cred__title {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--night);
  line-height: 1.6;
}

.page-about .about-cred__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---- 合作生态 ---- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 28px;
}

.page-about .about-eco__card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--night-2);
  padding: 22px 20px;
  transition: transform .24s var(--ease), box-shadow .24s var(--ease), border-left-color .24s var(--ease);
}

.page-about .about-eco__card:hover {
  transform: translateY(-4px);
  border-left-color: var(--sig);
  box-shadow: var(--shadow-2);
}

.page-about .about-eco__card--quote {
  border-left-color: var(--gold);
}

.page-about .about-eco__num {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  color: var(--night);
}

.page-about .about-eco__title {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--night);
}

.page-about .about-eco__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-eco__card:nth-child(2) {
  margin-top: 0;
}

/* ---- 联系我们 ---- */
.page-about .about-contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 18px;
}

.page-about .section--night .about-contact__grid .section__lede {
  color: rgba(242, 245, 247, .78);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

.page-about .about-contact__list {
  margin: 0;
  padding: 4px 0;
  border-top: 1px solid rgba(199, 210, 219, .3);
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(199, 210, 219, .3);
}

.page-about .about-contact__k {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: rgba(242, 245, 247, .6);
}

.page-about .about-contact__v {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-all;
}

.page-about .about-contact__footnote {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(242, 245, 247, .6);
}

/* ---- 响应式 ---- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

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

  .page-about .about-duties {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 20px;
  }

  .page-about .about-eco__card:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .about-eco__card:nth-child(3) {
    grid-column: 1 / -1;
    margin-top: -6px;
  }

  .page-about .about-contact__row {
    grid-template-columns: 120px 1fr;
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-shift__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 40px;
  }

  .page-about .about-staff {
    grid-template-columns: 1.35fr 1fr;
    gap: 32px;
  }

  .page-about .about-staff__cards {
    grid-template-columns: 1fr;
  }

  .page-about .about-staff__figure {
    align-self: start;
  }

  .page-about .about-creds__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 40px;
  }

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

  .page-about .about-eco__card:nth-child(1) {
    margin-top: 0;
  }

  .page-about .about-eco__card:nth-child(2) {
    margin-top: 44px;
  }

  .page-about .about-eco__card:nth-child(3) {
    grid-column: auto;
    margin-top: 18px;
  }

  .page-about .about-contact__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 48px;
  }

  .page-about .about-timeline {
    padding-left: 30px;
  }

  .page-about .about-timeline__dot {
    left: -30px;
  }
}

@media (hover: hover) and (min-width: 960px) {
  .page-about .about-timeline__points {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    border-top-color: transparent;
    transition: max-height .34s var(--ease), opacity .26s var(--ease), border-top-color .26s var(--ease);
  }

  .page-about .about-timeline__item:hover .about-timeline__points,
  .page-about .about-timeline__item:focus-within .about-timeline__points {
    max-height: 240px;
    opacity: 1;
    border-top-color: var(--line);
  }

  .page-about .about-timeline__item:hover .about-timeline__dot,
  .page-about .about-timeline__item:focus-within .about-timeline__dot {
    background: var(--sig);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-duty,
  .page-about .about-eco__card,
  .page-about .about-staff__card,
  .page-about .about-metric,
  .page-about .about-timeline__points {
    transition: none;
  }

  .page-about .about-duty:hover,
  .page-about .about-eco__card:hover {
    transform: none;
  }
}
<<<END>>>