.page-about {
  --about-gap: clamp(20px, 3.4vw, 44px);
  --about-band: clamp(52px, 7.5vw, 108px);
  --about-measure: 68ch;
}

.page-about .about-band {
  padding-block: var(--about-band);
}

.page-about .eyebrow {
  margin: 0 0 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 4vw, 56px) clamp(28px, 5vw, 72px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-hero__lede h1 {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  color: var(--fog);
  text-wrap: balance;
}

.page-about .about-hero__text {
  max-width: 46ch;
  margin: 0;
  color: var(--mist);
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.78;
}

.page-about .about-hero__tags {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--hair-strong);
  box-shadow: var(--shadow-soft);
  aspect-ratio: 7 / 5;
}

.page-about .about-hero__media img,
.page-about .about-roles__media img,
.page-about .about-flow__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 起源 ---------- */
.page-about .about-origin {
  border-top: 1px solid var(--hair);
}

.page-about .about-origin__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-origin__body h2 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  margin: 0 0 22px;
  color: var(--fog);
}

.page-about .about-origin__body p {
  max-width: var(--about-measure);
  margin: 0 0 18px;
  color: var(--mist);
  line-height: 1.85;
  font-size: 16px;
}

.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__aside {
  display: grid;
  gap: 16px;
  align-self: start;
  padding-top: 6px;
}

.page-about .about-note {
  border-left: 2px solid var(--cyan);
  padding: 2px 0 2px 16px;
}

.page-about .about-note__label {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-note__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 规模数字 ---------- */
.page-about .about-figures {
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(51, 240, 208, 0.07), transparent 60%),
    var(--ink-800);
  border-block: 1px solid var(--hair);
}

.page-about .about-figures__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(22px, 3.4vw, 40px) clamp(16px, 2.4vw, 32px);
}

.page-about .about-figure {
  border-top: 1px solid var(--hair-strong);
  padding-top: 14px;
}

.page-about .about-figure__num {
  font-size: clamp(34px, 7.5vw, 62px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-figure__unit {
  font-size: 13px;
  color: var(--mist);
  margin-left: 4px;
  letter-spacing: 0.12em;
}

.page-about .about-figure__label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 岗位 ---------- */
.page-about .about-roles__head {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-roles__lead h2 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  margin: 0 0 16px;
  color: var(--fog);
}

.page-about .about-roles__intro {
  margin: 0;
  max-width: 48ch;
  color: var(--mist);
  line-height: 1.82;
  font-size: 15.5px;
}

.page-about .about-roles__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--hair-strong);
}

.page-about .about-roles__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-700), var(--ink-800) 78%);
  box-shadow: 0 18px 44px -36px #000;
  transition: transform 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-2px);
  border-color: var(--hair-strong);
  box-shadow: inset 2px 0 0 0 var(--cyan), 0 22px 50px -34px #000;
}

.page-about .about-role__num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin-bottom: 12px;
}

.page-about .about-role__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--fog);
  letter-spacing: 0.02em;
}

.page-about .about-role__desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-role__tail {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--hair);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  background: var(--ink-800);
  border-block: 1px solid var(--hair);
}

.page-about .about-flow__inner {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-about .about-flow__media {
  margin: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--hair-strong);
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding-bottom: clamp(18px, 2.6vw, 26px);
  border-bottom: 1px solid var(--hair);
}

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

.page-about .about-step__num {
  font-size: 22px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-step__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--fog);
}

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

/* ---------- 覆盖 ---------- */
.page-about .about-reach {
  background:
    radial-gradient(90% 120% at 78% 12%, rgba(42, 42, 85, 0.55), transparent 62%),
    var(--ink-900);
}

.page-about .about-reach__inner {
  display: grid;
  gap: clamp(30px, 4.4vw, 60px);
  align-items: center;
}

.page-about .about-reach__copy h2 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  margin: 0 0 18px;
  color: var(--fog);
}

.page-about .about-reach__copy p {
  margin: 0 0 16px;
  max-width: 56ch;
  color: var(--mist);
  line-height: 1.85;
  font-size: 15.5px;
}

.page-about .about-reach__copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-reach__chart {
  justify-self: center;
  text-align: center;
  max-width: 300px;
}

.page-about .about-ring {
  position: relative;
  width: clamp(180px, 46vw, 236px);
  aspect-ratio: 1;
  margin: 0 auto 18px;
}

.page-about .about-ring svg {
  width: 100%;
  height: 100%;
  display: block;
}

.page-about .about-ring__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  align-content: center;
  gap: 0 2px;
}

.page-about .about-ring__num {
  font-size: clamp(38px, 9vw, 52px);
  line-height: 1;
  color: var(--fog);
}

.page-about .about-ring__pct {
  font-family: var(--num);
  font-size: 18px;
  color: var(--orange);
  align-self: flex-start;
  margin-top: 8px;
}

.page-about .about-ring__label {
  flex: 0 0 100%;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
  margin-top: 8px;
}

.page-about .about-ring__caption {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-history__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-history__head h2 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  margin: 0 0 14px;
  color: var(--fog);
}

.page-about .about-history__intro {
  margin: 0;
  max-width: 50ch;
  color: var(--mist);
  line-height: 1.8;
  font-size: 15.5px;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--hair-strong) 6%, var(--hair-strong) 94%, transparent);
}

.page-about .about-era {
  position: relative;
  padding-left: 38px;
}

.page-about .about-era + .about-era {
  margin-top: 8px;
}

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 21px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(51, 240, 208, 0.09);
}

.page-about .about-era__item {
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: border-color 220ms var(--ease), background 220ms var(--ease);
}

.page-about .about-era__item[open] {
  border-color: var(--hair);
  background: var(--ink-800);
}

.page-about .about-era__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-era__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-era__summary:hover .about-era__title,
.page-about .about-era__summary:focus-visible .about-era__title {
  color: var(--cyan);
}

.page-about .about-era__year {
  font-size: 24px;
  line-height: 1;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.page-about .about-era__title {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 16px;
  color: var(--fog);
  transition: color 200ms var(--ease);
}

.page-about .about-era__body {
  padding: 0 16px 18px;
}

.page-about .about-era__body p {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 14px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 做事方式 ---------- */
.page-about .about-principles {
  border-top: 1px solid var(--hair);
}

.page-about .about-principles__head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-principles__head h2 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.22;
  margin: 0;
  color: var(--fog);
}

.page-about .about-principles__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-principle {
  border-top: 1px solid var(--hair-strong);
  padding-top: 16px;
}

.page-about .about-principle__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .about-principle__title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--fog);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 延伸 ---------- */
.page-about .about-next {
  background: var(--ink-800);
  border-top: 1px solid var(--hair);
}

.page-about .about-next__head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-next__head h2 {
  font-family: var(--serif);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.22;
  margin: 0 0 12px;
  color: var(--fog);
}

.page-about .about-next__intro {
  margin: 0;
  color: var(--mist);
  line-height: 1.8;
  font-size: 15px;
  max-width: 48ch;
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 22px 48px 22px 20px;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(200deg, rgba(18, 59, 51, 0.9), rgba(7, 17, 15, 0.9));
  text-decoration: none;
  transition: transform 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-next__kicker {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-next__title {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .about-next__arrow {
  position: absolute;
  right: 20px;
  bottom: 20px;
  font-size: 16px;
  color: var(--mist);
  transition: transform 220ms var(--ease), color 220ms var(--ease);
}

.page-about .about-next__card:hover .about-next__arrow {
  transform: translateX(4px);
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 4.5vw, 64px);
  }

  .page-about .about-origin__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-origin__aside {
    padding-top: 44px;
    gap: 26px;
  }

  .page-about .about-roles__head {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(28px, 4vw, 56px);
  }

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

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

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

  .page-about .about-reach__chart {
    justify-self: end;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-next__card,
  .page-about .about-next__arrow,
  .page-about .about-era__title,
  .page-about .about-era__item {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>