.page-about {
  background: var(--mist);
  color: var(--graphite);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.012em;
  color: var(--indigo);
}

.page-about p {
  margin: 0;
}

.page-about ul,
.page-about ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 4.5rem);
  background: var(--indigo);
  color: var(--mist);
}

.page-about .about-hero__wash {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 55% at 88% 6%, rgba(214, 161, 90, 0.24), transparent 68%),
    radial-gradient(48% 50% at 6% 92%, rgba(30, 158, 122, 0.18), transparent 70%),
    linear-gradient(180deg, rgba(17, 43, 92, 0) 42%, rgba(8, 26, 58, 0.55) 100%);
}

.page-about .about-hero .wrap {
  position: relative;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__crumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.04em;
}

.page-about .about-hero__crumb li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: rgba(245, 247, 251, 0.55);
}

.page-about .about-hero__crumb li + li::before {
  content: "/";
  color: rgba(214, 161, 90, 0.6);
}

.page-about .about-hero__crumb a {
  color: var(--gold-soft);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.2em;
  color: var(--gold-soft);
}

.page-about .about-hero__title {
  margin-top: 1rem;
  max-width: 13em;
  font-size: clamp(2.05rem, 6.4vw, 4.2rem);
  font-weight: 800;
  line-height: 1.06;
  color: var(--mist);
  text-wrap: balance;
}

.page-about .about-hero__title em {
  position: relative;
  font-style: normal;
  color: var(--gold);
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.1em;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), rgba(214, 161, 90, 0));
}

.page-about .about-hero__lede {
  max-width: 34em;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: rgba(245, 247, 251, 0.8);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.5rem;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-stat__lab {
  display: block;
  margin-top: 0.45rem;
  font-size: var(--fs-note);
  line-height: 1.5;
  color: rgba(245, 247, 251, 0.64);
}

.page-about .about-hero__figure {
  margin: clamp(2rem, 5vw, 3.5rem) 0 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vw, 340px);
  object-fit: cover;
  object-position: center;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2.25rem), calc(100% - 2.25rem) 100%, 0 100%);
}

.page-about .about-hero__figure figcaption {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: rgba(245, 247, 251, 0.5);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(2.5rem, 5vw, 5rem);
    align-items: end;
  }
}

/* ---------- 正文骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(2rem, 4vw, 2.5rem);
  padding-block: clamp(2.5rem, 6vw, 5rem) clamp(3rem, 7vw, 6rem);
}

.page-about .about-index {
  border-left: 2px solid var(--copper);
  padding-left: 0.9rem;
}

.page-about .about-index__title {
  margin-bottom: 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .about-index__list {
  display: grid;
  gap: 0.5rem;
  font-size: var(--fs-small);
}

.page-about .about-index__list a {
  display: flex;
  gap: 0.5rem;
  text-decoration: none;
  line-height: 1.4;
  color: rgba(29, 38, 53, 0.82);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--copper);
  transform: translateX(2px);
}

.page-about .about-index__list .mono {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  color: var(--copper);
  opacity: 0.75;
}

.page-about .about-content > .about-sec {
  padding-block: clamp(2.25rem, 4.5vw, 3.5rem);
  border-top: 1px solid var(--line-light);
}

.page-about .about-content > .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 175px minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 6.5rem;
  }
}

/* ---------- 章节标题 ---------- */

.page-about .about-sec__head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-sec__no {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.14em;
  color: var(--copper);
}

.page-about .about-sec__title {
  font-size: clamp(1.35rem, 3.1vw, 1.95rem);
  color: var(--indigo);
  text-wrap: balance;
}

.page-about .about-sec__intro {
  max-width: 42em;
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
  color: rgba(29, 38, 53, 0.82);
}

@media (min-width: 760px) {
  .page-about .about-sec__head {
    grid-template-columns: 2.6rem minmax(0, 1fr);
    gap: 1.15rem;
    align-items: start;
  }

  .page-about .about-sec__no {
    padding-top: 0.5rem;
  }
}

/* ---------- 使命 ---------- */

.page-about .about-mission {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-mission__text p {
  max-width: 40em;
  color: rgba(29, 38, 53, 0.86);
}

.page-about .about-mission__text p + p {
  margin-top: 1rem;
}

.page-about .about-mission__list {
  display: grid;
  gap: 0.8rem;
  align-content: start;
}

.page-about .about-mission__list li {
  padding: 1rem 1.05rem 1.05rem 1.15rem;
  background: #ffffff;
  border-left: 3px solid var(--copper);
  box-shadow: 0 1px 0 rgba(8, 26, 58, 0.05);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 0.9rem), calc(100% - 0.9rem) 100%, 0 100%);
}

.page-about .about-mission__list h3 {
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--indigo);
}

.page-about .about-mission__list p {
  font-size: var(--fs-small);
  line-height: 1.65;
  color: rgba(29, 38, 53, 0.75);
}

@media (min-width: 880px) {
  .page-about .about-mission {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline__figure {
  margin: 0 0 clamp(1.5rem, 3.5vw, 2.25rem);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(1.5rem 0, 100% 0, 100% 100%, 0 100%, 0 1.5rem);
}

.page-about .about-timeline {
  display: grid;
}

.page-about .about-stage {
  position: relative;
  padding-left: 1.5rem;
  border-left: 1px solid rgba(183, 122, 53, 0.32);
}

.page-about .about-stage__node {
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 0.62rem;
  height: 0.62rem;
  box-sizing: border-box;
  transform: translate(-50%, 0);
  border-radius: 50%;
  border: 2px solid var(--copper);
  background: var(--mist);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-stage details[open] .about-stage__node {
  background: var(--jade);
  border-color: var(--jade);
  box-shadow: 0 0 0 4px rgba(30, 158, 122, 0.16);
}

.page-about .about-stage__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.85rem;
  padding: 0.85rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage__sum::marker {
  content: "";
}

.page-about .about-stage__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--copper);
}

.page-about .about-stage details[open] > .about-stage__sum::after {
  content: "–";
}

.page-about .about-stage__ph {
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .about-stage__name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--indigo);
  transition: color var(--dur) var(--ease);
}

.page-about .about-stage__sum:hover .about-stage__name,
.page-about .about-stage__sum:focus-visible .about-stage__name {
  color: var(--copper);
}

.page-about .about-stage__body {
  padding-bottom: 1.1rem;
}

.page-about .about-stage__body p {
  max-width: 42em;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(29, 38, 53, 0.78);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 0.85rem;
}

.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.1rem 1rem 1.2rem;
  background: linear-gradient(160deg, var(--indigo-mid), var(--indigo));
  color: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1rem), calc(100% - 1rem) 100%, 0 100%);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-team__card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .about-team__card p {
  font-size: var(--fs-note);
  line-height: 1.65;
  color: rgba(245, 247, 251, 0.72);
}

.page-about .about-team__note {
  margin-top: 1.15rem;
  padding: 0.95rem 1.1rem;
  background: var(--sand);
  border-left: 3px solid var(--jade);
  font-size: var(--fs-small);
  line-height: 1.72;
  color: rgba(29, 38, 53, 0.82);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 0.8rem), calc(100% - 0.8rem) 100%, 0 100%);
}

/* ---------- 资料治理 ---------- */

.page-about .about-govern {
  display: grid;
}

.page-about .about-govern__step {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line-light);
}

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

.page-about .about-govern__idx {
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .about-govern__step h3 {
  margin-bottom: 0.25rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--indigo);
}

.page-about .about-govern__step p {
  max-width: 44em;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: rgba(29, 38, 53, 0.78);
}

.page-about .about-vault {
  margin-top: clamp(1.5rem, 3.5vw, 2.25rem);
  padding: clamp(1.25rem, 3vw, 1.85rem);
  background: var(--indigo);
  color: var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.5rem), calc(100% - 1.5rem) 100%, 0 100%);
}

.page-about .about-vault__title {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.16em;
  color: var(--gold-soft);
}

.page-about .about-vault__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(115px, 1fr));
  gap: 1rem;
}

.page-about .about-vault__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-vault__lab {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--fs-note);
  line-height: 1.5;
  color: rgba(245, 247, 251, 0.66);
}

/* ---------- 服务覆盖 ---------- */

.page-about .about-coverage {
  display: grid;
  gap: clamp(1.5rem, 3.5vw, 2.25rem);
}

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

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 2rem 100%, 0 calc(100% - 2rem));
}

.page-about .about-coverage__figure figcaption {
  margin-top: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  line-height: 1.55;
  color: rgba(29, 38, 53, 0.55);
}

.page-about .about-coverage__lede {
  max-width: 36em;
  color: rgba(29, 38, 53, 0.85);
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin-top: 1.35rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line-light);
}

.page-about .about-coverage__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.8vw, 1.65rem);
  font-weight: 600;
  line-height: 1;
  color: var(--indigo);
}

.page-about .about-coverage__stats li > span:last-child {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--fs-note);
  line-height: 1.5;
  color: rgba(29, 38, 53, 0.62);
}

.page-about .about-coverage__foot {
  margin-top: 1.15rem;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: rgba(29, 38, 53, 0.7);
}

@media (min-width: 880px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }
}

/* ---------- 协作与质量 ---------- */

.page-about .about-eco p {
  max-width: 44em;
  color: rgba(29, 38, 53, 0.84);
}

.page-about .about-eco p + p {
  margin-top: 0.9rem;
}

.page-about .about-eco__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.page-about .about-eco__chips li {
  padding: 0.35rem 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.04em;
  color: var(--indigo);
  border: 1px solid rgba(183, 122, 53, 0.45);
  border-radius: 999px;
}

/* ---------- 收束 ---------- */

.page-about .about-start {
  position: relative;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  color: var(--mist);
  background:
    radial-gradient(70% 90% at 90% 8%, rgba(214, 161, 90, 0.22), transparent 65%),
    linear-gradient(155deg, var(--indigo-mid), var(--indigo) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), calc(100% - 2rem) 100%, 0 100%);
}

.page-about .about-start__title {
  margin-bottom: 1.35rem;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  color: var(--mist);
}

.page-about .about-start__steps {
  display: grid;
  gap: 1rem;
}

.page-about .about-start__steps li {
  padding-top: 0.85rem;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-start__steps .mono {
  display: block;
  margin-bottom: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-note);
  letter-spacing: 0.12em;
  color: var(--gold-soft);
}

.page-about .about-start__steps p {
  font-size: var(--fs-small);
  line-height: 1.7;
  color: rgba(245, 247, 251, 0.78);
}

.page-about .about-start__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-top: clamp(1.5rem, 3vw, 2rem);
}

.page-about .about-start__link {
  padding-bottom: 1px;
  font-size: var(--fs-small);
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 201, 135, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-start__link:hover,
.page-about .about-start__link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

@media (min-width: 760px) {
  .page-about .about-start__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>