.page-about {
  --about-gap: 12px;
  --about-min: 0;
  padding-bottom: clamp(56px, 9vw, 130px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--bar-h) + clamp(34px, 6vh, 84px));
  padding-bottom: clamp(30px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 6.6vw, 76px);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__side {
  border-left: 2px solid var(--neon);
  padding-left: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 14px 16px;
  background: var(--ink);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.05;
  color: var(--neon);
}

.page-about .about-stats__item--flare .about-stats__num {
  color: var(--flare);
}

.page-about .about-stats__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-stats__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 我们做什么 ---------- */
.page-about .about-what__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-what__lead {
  margin: 0;
  max-width: 40ch;
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-what__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-what__item {
  background: var(--ink);
  padding: clamp(16px, 2vw, 22px) 0;
  display: grid;
  gap: 8px;
  transition: background-color 160ms var(--ease);
}

.page-about .about-what__item:hover {
  background: var(--panel);
}

.page-about .about-what__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 21px);
  letter-spacing: 0.03em;
  color: var(--neon);
}

.page-about .about-what__text {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-what__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 38px);
}

/* ---------- 历程 ---------- */
.page-about .about-history__grid {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .about-miles {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(26px, 3.4vw, 40px);
}

.page-about .about-miles::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon) 0%, rgba(43, 240, 198, 0.35) 58%, rgba(43, 240, 198, 0.06) 100%);
}

.page-about .about-mile {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
  align-items: start;
}

.page-about .about-mile__idx {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--on-neon);
  background: var(--neon);
  clip-path: var(--cut-sm);
}

.page-about .about-mile--now .about-mile__idx {
  background: var(--flare);
  color: var(--mist);
}

.page-about .about-mile__body {
  padding-top: 2px;
}

.page-about .about-mile__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 24px);
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-mile__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  align-items: center;
}

.page-about .about-team__visual {
  display: grid;
  justify-items: center;
  gap: 18px;
}

.page-about .about-donut {
  width: min(250px, 66vw);
  height: auto;
  overflow: visible;
}

.page-about .about-donut circle {
  transition: stroke-width 160ms var(--ease);
}

.page-about .about-donut circle:hover {
  stroke-width: 21;
}

.page-about .about-donut__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 36px;
  font-weight: 700;
  fill: var(--mist);
}

.page-about .about-donut__unit {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.08em;
  fill: var(--muted);
}

.page-about .about-team__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-team__legend li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-key {
  width: 12px;
  height: 4px;
  display: inline-block;
}

.page-about .about-key--neon {
  background: var(--neon);
}

.page-about .about-key--flare {
  background: var(--flare);
}

.page-about .about-team__text {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-shifts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-shift {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-shift__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-shift__v {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 18px);
}

.page-about .about-step {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--cut);
  transition: border-color 120ms var(--ease), background-color 120ms var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--neon);
  background: var(--panel-2);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--neon);
  margin-bottom: 14px;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 1.8vw, 20px);
  letter-spacing: 0.04em;
  color: var(--mist);
}

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

.page-about .about-fields {
  margin-top: clamp(30px, 4vw, 48px);
  padding: clamp(20px, 2.6vw, 28px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-fields__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-fields__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-fields__list li {
  padding: 7px 16px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: var(--panel);
  border-left: 2px solid var(--cyan);
}

.page-about .about-fields__note {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-process__figure {
  margin: clamp(30px, 4.4vw, 54px) 0 0;
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

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

.page-about .about-coverage__text {
  margin: 0 0 16px;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-partners {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partners__item {
  background: var(--ink);
  padding: 16px;
  display: grid;
  gap: 4px;
  align-content: start;
}

.page-about .about-partners__item--wide {
  grid-column: 1 / -1;
  background: var(--panel);
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  color: var(--flare);
}

.page-about .about-partners__label {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-coverage__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 48ch;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 承诺 ---------- */
.page-about .about-promise__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-promise__item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 30px);
  padding: clamp(20px, 2.8vw, 28px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-promise__mark {
  width: 14px;
  height: 14px;
  margin-top: 9px;
  background: var(--neon);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .about-promise__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 21px);
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-promise__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(32px, 4.6vw, 56px);
  padding: clamp(22px, 3vw, 32px);
  background: var(--panel);
  clip-path: var(--cut-lg);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-step:nth-child(even) {
    transform: translateY(30px);
  }

  .page-about .about-steps {
    padding-bottom: 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-what__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-history__figure {
    position: sticky;
    top: calc(var(--bar-h) + 36px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__side {
    padding-left: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-what__item,
  .page-about .about-donut circle {
    transition: none;
  }

  .page-about .about-step:nth-child(even) {
    transform: none;
  }
}