.page-about {
  --about-gap: clamp(56px, 8vw, 112px);
  --about-line: rgba(159, 176, 200, 0.22);
  background: var(--ink-950);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(104px, 16vw, 176px) 0 clamp(48px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 86% 0%, rgba(62, 124, 123, 0.32) 0%, rgba(62, 124, 123, 0) 62%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 55%, var(--ink-950) 100%);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -20% auto -20%;
  height: 160%;
  background: repeating-radial-gradient(ellipse at 80% 18%, transparent 0 44px, rgba(159, 176, 200, 0.09) 44px 45px);
  pointer-events: none;
}

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

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(24px, 4vw, 40px);
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rock);
}

.page-about .crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--lime);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__lead {
  max-width: 42rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 18ch;
}

.page-about .about-hero h1 .u-heavy {
  font-weight: 800;
  color: var(--lime);
}

.page-about .about-hero .lede {
  color: var(--mist);
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(16px, 3vw, 36px);
  margin: clamp(28px, 4vw, 44px) 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__facts > div {
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__facts dt {
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--white);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--about-line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 26, 48, 0) 42%, rgba(14, 26, 48, 0.78) 100%);
  pointer-events: none;
}

.page-about .about-hero__figure .figure__media {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: var(--about-gap) 0;
  background: var(--ink-950);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-origin h2 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.7rem, 3.4vw, 2.8rem);
  line-height: 1.24;
  margin: 0 0 20px;
}

.page-about .about-origin__text p {
  color: var(--mist);
  line-height: 1.85;
  max-width: 46ch;
  margin: 0 0 16px;
}

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

.page-about .about-origin__note {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(62, 124, 123, 0.55);
  border-radius: 16px;
  background: rgba(62, 124, 123, 0.16);
  align-self: start;
}

.page-about .about-origin__note-k {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0 0 14px;
}

.page-about .about-origin__note p {
  color: var(--pale);
  font-size: 0.94rem;
  line-height: 1.8;
  margin: 0 0 16px;
}

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

.page-about .about-origin__note-link a {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-origin__note-link a:hover,
.page-about .about-origin__note-link a:focus-visible {
  color: var(--lime);
}

/* ---------- 时间脊 ---------- */
.page-about .about-ridge {
  position: relative;
  padding: var(--about-gap) 0;
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  overflow: hidden;
}

.page-about .about-ridge::before {
  content: "";
  position: absolute;
  inset: auto -10% -10% auto;
  width: 70%;
  height: 60%;
  background: repeating-radial-gradient(ellipse at 100% 100%, transparent 0 56px, rgba(159, 176, 200, 0.07) 56px 57px);
  pointer-events: none;
}

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

.page-about .about-ridge__head {
  max-width: 58ch;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-ridge h2 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.2;
  margin: 0 0 16px;
}

.page-about .about-ridge__sub {
  color: var(--mist);
  line-height: 1.85;
  margin: 0;
  max-width: 52ch;
}

.page-about .about-ridge__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-ridge__jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-ridge__jump .mono {
  color: var(--lime);
  transition: color var(--dur) var(--ease);
}

.page-about .about-ridge__jump a:hover,
.page-about .about-ridge__jump a:focus-visible {
  color: var(--ink-950);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-ridge__jump a:hover .mono,
.page-about .about-ridge__jump a:focus-visible .mono {
  color: var(--ink-950);
}

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

.page-about .ridge::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--teal) 45%, rgba(159, 176, 200, 0.22) 100%);
  opacity: 0.75;
}

.page-about .ridge__item {
  position: relative;
  padding-left: 34px;
  scroll-margin-top: 96px;
}

.page-about .ridge__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 14px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 2px solid var(--lime);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ridge__item:hover::before,
.page-about .ridge__item:focus-within::before {
  background: var(--lime);
  box-shadow: 0 0 0 6px rgba(217, 242, 92, 0.16);
}

.page-about .ridge__year {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .ridge__card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  background: rgba(27, 42, 74, 0.45);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ridge__card:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .ridge__item:hover .ridge__card,
.page-about .ridge__item:focus-within .ridge__card {
  border-color: var(--line-lime);
  background: rgba(27, 42, 74, 0.72);
  transform: translateY(-2px);
}

.page-about .ridge__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .ridge__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  line-height: 1.36;
  margin: 0 0 12px;
}

.page-about .ridge__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.8;
  max-width: 50ch;
}

.page-about .ridge__more {
  overflow: hidden;
}

.page-about .ridge__more ul {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--pale);
  font-size: 0.9rem;
  line-height: 1.9;
}

.page-about .ridge__more li::marker {
  color: var(--clay);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-gap) 0;
  background: var(--ink-950);
}

.page-about .about-team__head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-team h2 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.2;
  margin: 0 0 16px;
}

.page-about .about-team__head p {
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .crew li {
  padding: 18px 20px;
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: rgba(27, 42, 74, 0.35);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .crew li:hover {
  border-color: var(--line-lime);
  background: rgba(27, 42, 74, 0.62);
}

.page-about .crew__num {
  display: block;
  margin-bottom: 10px;
  font-size: 28px;
  line-height: 1;
  color: var(--lime);
}

.page-about .crew__role {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 6px;
}

.page-about .crew__desc {
  margin: 0;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.72;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: 18px;
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-team__figure .figure__media {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-team__review {
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-team__review h3 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  margin: 0 0 20px;
}

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

.page-about .review li {
  padding: 18px 18px 20px;
  border-left: 2px solid var(--teal);
  border-radius: 0 12px 12px 0;
  background: rgba(62, 124, 123, 0.1);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .review li:hover {
  background: rgba(62, 124, 123, 0.2);
  border-color: var(--lime);
}

.page-about .review__num {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .review__name {
  display: block;
  margin-bottom: 6px;
  font-weight: 800;
  font-size: 0.98rem;
  font-family: var(--font-head);
}

.page-about .review__desc {
  margin: 0;
  color: var(--mist);
  font-size: 0.84rem;
  line-height: 1.72;
}

.page-about .about-team__review-foot {
  margin: 20px 0 0;
  color: var(--pale);
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 56ch;
}

/* ---------- 走访与校准 ---------- */
.page-about .about-caliper {
  padding: var(--about-gap) 0;
  background: var(--paper);
  color: var(--indigo);
}

.page-about .about-caliper .eyebrow {
  color: var(--ink-950);
}

.page-about .about-caliper .eyebrow::before {
  background: var(--clay);
}

.page-about .about-caliper h2 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.2;
  color: var(--ink-950);
  margin: 0 0 18px;
}

.page-about .about-caliper__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-caliper__grid p {
  margin: 0 0 16px;
  color: var(--rock);
  line-height: 1.9;
  max-width: 48ch;
}

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

.page-about .caliper__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--pale);
  border: 1px solid var(--pale);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .caliper__stats li {
  background: var(--white);
  padding: 22px 20px;
}

.page-about .caliper__stats .mono {
  display: block;
  margin-bottom: 10px;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--indigo);
}

.page-about .caliper__stats span:last-child {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--rock);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  position: relative;
  padding: var(--about-gap) 0;
  background: var(--ink-950);
  overflow: hidden;
}

.page-about .about-partners::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-radial-gradient(ellipse at 18% 108%, transparent 0 60px, rgba(159, 176, 200, 0.06) 60px 61px);
  pointer-events: none;
}

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

.page-about .about-partners__head {
  max-width: 58ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-partners h2 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.2;
  margin: 0 0 16px;
}

.page-about .about-partners__head p {
  margin: 0;
  color: var(--mist);
  line-height: 1.85;
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .nodes__item {
  position: relative;
  padding: 20px 20px 20px 46px;
  border: 1px solid var(--about-line);
  border-radius: 14px;
  background: rgba(62, 124, 123, 0.1);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .nodes__item::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--clay);
  background: transparent;
  transition: background-color var(--dur) var(--ease);
}

.page-about .nodes__item:hover,
.page-about .nodes__item:focus-within {
  border-color: var(--line-lime);
  background: rgba(62, 124, 123, 0.22);
  transform: translateY(-2px);
}

.page-about .nodes__item:hover::before,
.page-about .nodes__item:focus-within::before {
  background: var(--clay);
}

.page-about .nodes__item:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.page-about .nodes__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1rem;
  margin: 0 0 6px;
}

.page-about .nodes__type {
  margin: 0;
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.72;
}

.page-about .about-partners__figure {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-partners__figure .figure__media {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-partners__honor {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-partners__honor li {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding-top: 10px;
  border-top: 1px solid var(--about-line);
  color: var(--pale);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .about-partners__honor .mono {
  flex: none;
  color: var(--clay);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

/* ---------- 服务原则 ---------- */
.page-about .about-principles {
  padding: var(--about-gap) 0 calc(var(--about-gap) * 0.85);
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
}

.page-about .about-principles__head {
  max-width: 52ch;
}

.page-about .about-principles h2 {
  font-family: var(--font-head);
  font-weight: 200;
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.2;
  margin: 0;
}

.page-about .principles {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .principles li {
  background: var(--ink-950);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .principles__k {
  display: block;
  margin-bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .principles__t {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  margin: 0 0 10px;
}

.page-about .principles__d {
  margin: 0;
  color: var(--mist);
  font-size: 0.88rem;
  line-height: 1.76;
}

.page-about .about-principles__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 40px);
}

.page-about .about-principles__line {
  margin: clamp(20px, 3vw, 28px) 0 0;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-about .about-principles__line a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
  transition: color var(--dur) var(--ease);
}

.page-about .about-principles__line a:hover,
.page-about .about-principles__line a:focus-visible {
  color: var(--white);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .caliper__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 640px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-hero__figure {
    aspect-ratio: 4 / 5;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .ridge__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    padding-left: 44px;
  }

  .page-about .ridge__year {
    margin: 16px 0 0;
    font-size: 19px;
    line-height: 1;
  }

  .page-about .about-team__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

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

  .page-about .about-caliper__grid {
    grid-template-columns: 6fr 6fr;
    align-items: center;
  }

  .page-about .about-partners__grid {
    grid-template-columns: 8fr 4fr;
    align-items: start;
  }

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

@media (hover: hover) and (min-width: 900px) {
  .page-about .ridge__more {
    max-height: 0;
    opacity: 0;
    transition: max-height 260ms var(--ease), opacity 200ms var(--ease);
  }

  .page-about .ridge__item:hover .ridge__more,
  .page-about .ridge__item:focus-within .ridge__more {
    max-height: 260px;
    opacity: 1;
  }

  .page-about .nodes__type {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 240ms var(--ease), opacity 180ms var(--ease);
  }

  .page-about .nodes__item:hover .nodes__type,
  .page-about .nodes__item:focus-within .nodes__type {
    max-height: 96px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}

<<<END>>>