.page-about {
  --about-rule: rgba(22, 33, 29, 0.14);
  --about-rule-dark: rgba(230, 241, 236, 0.16);
  --about-soft: rgba(22, 33, 29, 0.78);
  background: var(--sig-paper);
  color: var(--sig-ink-text);
  font-family: var(--sig-sans);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(122px, 15vw, 176px) 0 clamp(108px, 14vw, 172px);
  background: var(--sig-ink);
  color: var(--sig-body);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -140px;
  width: clamp(280px, 44vw, 640px);
  height: clamp(280px, 44vw, 640px);
  background: radial-gradient(circle at 32% 32%, rgba(53, 242, 208, 0.2), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(54px, 8vw, 106px);
  background: var(--sig-paper);
  clip-path: polygon(0 100%, 100% 6%, 100% 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .sig-breadcrumb {
  margin-bottom: clamp(24px, 4vw, 42px);
  font-family: var(--sig-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sig-muted);
}

.page-about .about-hero .sig-breadcrumb a {
  color: var(--sig-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--sig-ease), border-color 160ms var(--sig-ease);
}

.page-about .about-hero .sig-breadcrumb a:hover,
.page-about .about-hero .sig-breadcrumb a:focus-visible {
  color: var(--sig-cyan);
  border-bottom-color: var(--sig-cyan);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(34px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__copy > .sig-eyebrow {
  display: block;
  margin: 0 0 16px;
  font-family: var(--sig-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sig-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 2.4vw, 24px);
  max-width: 15em;
  font-size: clamp(31px, 6.4vw, 58px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--sig-body);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--sig-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
  clip-path: polygon(0 0, 100% 5%, 100% 100%, 0 94%);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 7%;
  width: 44%;
  height: 3px;
  background: linear-gradient(90deg, var(--sig-cyan), var(--sig-orange));
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(42px, 6vw, 66px) 0 0;
  border-top: 1px solid var(--about-rule-dark);
  border-left: 1px solid var(--about-rule-dark);
}

.page-about .about-hero__fact {
  margin: 0;
  padding: 18px 16px;
  border-right: 1px solid var(--about-rule-dark);
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-hero__fact dt {
  margin: 0 0 8px;
  font-family: var(--sig-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--sig-muted);
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--sig-mono);
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sig-cyan);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding: clamp(58px, 8vw, 100px) 0;
}

.page-about .about-section .sig-eyebrow {
  display: block;
  margin: 0 0 14px;
  font-family: var(--sig-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sig-cyan-deep);
}

.page-about .about-h2 {
  margin: 0 0 clamp(16px, 2vw, 22px);
  max-width: 18em;
  font-size: clamp(25px, 4.2vw, 39px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--sig-ink);
}

.page-about .about-lead {
  margin: 0;
  max-width: 42em;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: clamp(16px, 3vw, 32px);
  padding-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 32px;
  top: 28px;
  bottom: 0;
  width: 1px;
  background: var(--sig-line);
}

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

.page-about .about-timeline__item:last-child::before {
  content: none;
}

.page-about .about-timeline__year {
  position: relative;
  padding-bottom: 18px;
  font-family: var(--sig-mono);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sig-cyan-deep);
}

.page-about .about-timeline__year::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 8px;
  height: 8px;
  transform: translate(-50%, 50%);
  border-radius: 50%;
  background: var(--sig-cyan-deep);
  box-shadow: 0 0 0 4px var(--sig-paper);
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.4vw, 21px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sig-ink);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-soft);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--about-rule);
  border-left: 1px solid var(--about-rule);
}

.page-about .about-team__cell {
  padding: clamp(24px, 3vw, 34px);
  border-right: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-team__cell::before {
  content: "";
  display: block;
  width: 36px;
  height: 3px;
  margin-bottom: 20px;
  background: var(--sig-cyan-deep);
}

.page-about .about-team__cell:nth-child(2)::before {
  background: var(--sig-orange);
}

.page-about .about-team__cell:nth-child(3)::before {
  background: var(--sig-blue);
}

.page-about .about-team__title {
  margin: 0 0 12px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sig-ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-soft);
}

.page-about .about-team__note {
  margin: clamp(24px, 3vw, 32px) 0 0;
  max-width: 44em;
  padding-left: 18px;
  border-left: 2px solid var(--sig-orange);
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

/* ---------- 流程（深色） ---------- */

.page-about .about-process {
  background: var(--sig-carbon);
  color: var(--sig-body);
}

.page-about .about-process .sig-eyebrow {
  color: var(--sig-cyan);
}

.page-about .about-process .about-h2 {
  color: var(--sig-body);
}

.page-about .about-process .about-lead {
  color: rgba(230, 241, 236, 0.74);
}

.page-about .about-process__media {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-about .about-process__media img {
  display: block;
  width: 100%;
  height: clamp(180px, 34vw, 340px);
  object-fit: cover;
  border-radius: 2px;
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(30px, 4vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-rule-dark);
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 6px 18px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-bottom: 1px solid var(--about-rule-dark);
}

.page-about .about-steps__num {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--sig-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--sig-cyan);
  padding-top: 3px;
}

.page-about .about-steps__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--sig-body);
}

.page-about .about-steps__text {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--sig-muted);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(26px, 4vw, 40px) 0 0;
  border-top: 1px solid var(--about-rule);
  border-left: 1px solid var(--about-rule);
}

.page-about .about-scale__stat {
  margin: 0;
  padding: clamp(18px, 2.6vw, 26px);
  border-right: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-scale__stat-label {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: rgba(22, 33, 29, 0.62);
}

.page-about .about-scale__stat-num {
  margin: 0;
  font-family: var(--sig-mono);
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--sig-cyan-deep);
}

.page-about .about-scale__band {
  margin-top: clamp(32px, 5vw, 54px);
  background: var(--sig-carbon);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-scale__band-img {
  display: block;
  width: 100%;
  height: clamp(110px, 22vw, 200px);
  object-fit: cover;
  opacity: 0.46;
}

.page-about .about-scale__ticks {
  list-style: none;
  display: flex;
  gap: clamp(16px, 3vw, 34px);
  margin: 0;
  padding: clamp(22px, 3vw, 30px) clamp(18px, 3vw, 30px) clamp(26px, 3.4vw, 36px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-scale__tick {
  position: relative;
  flex: 1 1 auto;
  min-width: 138px;
  padding-top: 20px;
  scroll-snap-align: start;
}

.page-about .about-scale__tick::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  background: var(--about-rule-dark);
}

.page-about .about-scale__tick::after {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sig-cyan);
}

.page-about .about-scale__tick-key {
  display: block;
  font-family: var(--sig-mono);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sig-body);
}

.page-about .about-scale__tick-val {
  display: block;
  margin-top: 6px;
  max-width: 14em;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--sig-muted);
}

/* ---------- 受众 ---------- */

.page-about .about-audience__list {
  list-style: none;
  display: grid;
  gap: clamp(22px, 3vw, 30px);
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-audience__item {
  padding-top: 20px;
  border-top: 2px solid var(--sig-cyan-deep);
}

.page-about .about-audience__item:nth-child(2) {
  border-top-color: var(--sig-orange);
}

.page-about .about-audience__item:nth-child(3) {
  border-top-color: var(--sig-blue);
}

.page-about .about-audience__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--sig-ink);
}

.page-about .about-audience__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-soft);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  padding: clamp(54px, 8vw, 92px) 0;
  background: var(--sig-ink);
  color: var(--sig-body);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--sig-cyan), var(--sig-orange));
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  align-items: end;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(23px, 3.6vw, 33px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--sig-body);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--sig-muted);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 680px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-audience__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(40px, 6vw, 72px);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .page-about .about-timeline__item::before {
    left: 47px;
  }
}

@media (max-width: 420px) {
  .page-about .about-hero__actions .sig-btn,
  .page-about .about-cta__actions .sig-btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .page-about .about-timeline__item::before {
    left: 27px;
  }

  .page-about .about-steps__item {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 6px 12px;
  }
}
<<<END>>>