.page-about {
  --about-line: rgba(18, 51, 43, 0.14);
  --about-axis-x: 38px;
}

.page-about .about-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 18px 72px;
}

.page-about .breadcrumb {
  font-size: 0.8125rem;
  margin-bottom: 22px;
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  color: var(--green-500);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--mist-400);
}

.page-about .breadcrumb a {
  color: var(--green-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease-out);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--gold-500);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  margin-bottom: 40px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-sans);
  font-size: clamp(1.85rem, 5.6vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  font-weight: 800;
  color: var(--green-900);
  margin: 10px 0 18px;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ink-950);
}

.page-about .about-panel {
  background: var(--paper-200);
  border: 1px solid var(--hair);
  border-radius: var(--radius-xl);
  padding: 22px 20px;
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-700);
}

.page-about .about-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-panel__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-panel__list li:last-child {
  border-bottom: 0;
}

.page-about .about-panel__k {
  font-size: 0.875rem;
  color: var(--green-700);
}

.page-about .about-panel__v {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--green-900);
  font-variant-numeric: tabular-nums;
}

.page-about .about-panel__note {
  margin: 14px 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--green-700);
}

/* 品牌起点 */
.page-about .origin {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: var(--green-900);
  color: var(--paper-100);
  padding: 32px 22px 34px;
  margin-bottom: 46px;
}

.page-about .origin__media {
  position: absolute;
  inset: 0;
  margin: 0;
}

.page-about .origin__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-about .origin__ridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 44%;
  fill: none;
  stroke: var(--gold-500);
  stroke-width: 1.1;
  opacity: 0.5;
  pointer-events: none;
}

.page-about .origin__body {
  position: relative;
  z-index: 1;
  max-width: 60ch;
}

.page-about .origin h2 {
  margin: 0 0 16px;
  font-size: clamp(1.45rem, 3.8vw, 2.15rem);
  line-height: 1.22;
  font-weight: 800;
  color: var(--gold-200);
}

.page-about .origin p {
  margin: 0 0 14px;
  font-size: 0.9688rem;
  line-height: 1.88;
  color: rgba(247, 243, 234, 0.93);
}

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

/* 栏目体系演进 */
.page-about .evo {
  margin-bottom: 48px;
}

.page-about .evo__head {
  max-width: 62ch;
  margin-bottom: 8px;
}

.page-about .evo__head p.muted {
  margin: 10px 0 0;
  line-height: 1.8;
}

.page-about .evo__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 24px;
}

.page-about .evo__jump a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-decoration: none;
  color: var(--green-700);
  background: var(--paper-100);
  border: 1px solid var(--hair);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  transition: border-color 0.18s var(--ease-out), background-color 0.18s var(--ease-out), color 0.18s var(--ease-out);
}

.page-about .evo__jump a:hover,
.page-about .evo__jump a:focus-visible {
  border-color: var(--gold-500);
  background: var(--gold-200);
  color: var(--green-900);
}

.page-about .evo__grid {
  display: grid;
  gap: 28px;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 22px;
  scroll-margin-top: 84px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: var(--about-axis-x);
  top: 14px;
  bottom: -6px;
  width: 1px;
  background: var(--about-line);
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-item__year {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  justify-self: start;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--green-700);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-card {
  position: relative;
  background: var(--paper-100);
  border: 1px solid var(--hair);
  border-left: 3px solid var(--gold-500);
  border-radius: var(--radius-lg);
  padding: 16px 16px 14px;
  transition: border-color 0.18s var(--ease-out), box-shadow 0.18s var(--ease-out);
}

.page-about .tl-card::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 3px var(--paper-100);
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-950);
}

.page-about .tl-item:target .tl-card {
  border-color: var(--gold-500);
  border-left-color: var(--clay-500);
  box-shadow: var(--shadow-soft);
}

.page-about .tl-item:target .tl-card::before {
  background: var(--clay-500);
}

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

.page-about .evo__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-xl);
  background: var(--paper-200);
}

.page-about .evo__fig figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--green-500);
}

/* 三步说明 */
.page-about .steps {
  margin-bottom: 48px;
}

.page-about .steps > p.muted {
  margin: 10px 0 0;
  line-height: 1.8;
  max-width: 58ch;
}

.page-about .steps__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .step {
  background: var(--paper-100);
  border: 1px solid var(--hair);
  border-radius: var(--radius-xl);
  padding: 20px 18px 18px;
  transition: border-color 0.18s var(--ease-out);
}

.page-about .step:hover,
.page-about .step:focus-within {
  border-color: var(--gold-500);
}

.page-about .step__no {
  display: inline-block;
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  color: var(--green-900);
  background: var(--gold-200);
  border-radius: var(--radius-pill);
  padding: 4px 13px;
}

.page-about .step__title {
  margin: 14px 0 8px;
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--ink-950);
}

.page-about .step__more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
}

.page-about .step__more summary {
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--green-700);
  list-style-position: inside;
}

.page-about .step__more summary:hover,
.page-about .step__more summary:focus-visible {
  color: var(--clay-500);
}

.page-about .step__more summary::marker {
  color: var(--clay-500);
}

.page-about .step__more p {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--green-700);
}

/* 团队分工 */
.page-about .team {
  margin-bottom: 48px;
}

.page-about .team__head p.muted {
  margin: 10px 0 0;
  line-height: 1.8;
  max-width: 56ch;
}

.page-about .team__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.page-about .team-card {
  background: var(--paper-200);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  padding: 16px 14px;
  transition: border-color 0.18s var(--ease-out), background-color 0.18s var(--ease-out);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--gold-500);
  background: var(--paper-100);
}

.page-about .team-card__num {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--green-900);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card h3 {
  margin: 8px 0 8px;
  font-size: 0.9688rem;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--green-700);
}

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

.page-about .team__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-xl);
  background: var(--paper-200);
}

.page-about .team__fig figcaption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--green-500);
}

/* 覆盖与合作 */
.page-about .reach {
  background: var(--green-900);
  color: var(--paper-100);
  border-radius: var(--radius-xl);
  padding: 30px 20px 26px;
  margin-bottom: 48px;
}

.page-about .reach h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3.8vw, 2.1rem);
  line-height: 1.24;
  font-weight: 800;
  color: var(--gold-200);
  max-width: 26ch;
}

.page-about .stairs {
  display: grid;
  gap: 12px;
  margin: 22px 0 20px;
}

.page-about .stat {
  background: rgba(247, 243, 234, 0.06);
  border: 1px solid var(--hair-light);
  border-radius: var(--radius-lg);
  padding: 16px 14px;
  transition: border-color 0.18s var(--ease-out), background-color 0.18s var(--ease-out);
}

.page-about .stat:hover {
  border-color: var(--gold-500);
  background: rgba(216, 181, 106, 0.1);
}

.page-about .stat__num {
  display: block;
  font-size: clamp(1.6rem, 4.4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.page-about .stat__unit {
  font-size: 0.8125rem;
  font-weight: 400;
  color: rgba(247, 243, 234, 0.78);
  margin-left: 5px;
  letter-spacing: 0;
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(247, 243, 234, 0.85);
}

.page-about .reach > p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.9688rem;
  line-height: 1.88;
  color: rgba(247, 243, 234, 0.9);
}

/* 荣誉与质量 */
.page-about .proof {
  margin-bottom: 48px;
}

.page-about .proof .rows {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .proof .rows li {
  display: grid;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-line);
  transition: background-color 0.18s var(--ease-out);
}

.page-about .proof .rows li:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .proof .rows li:hover {
  background: var(--paper-200);
}

.page-about .proof .row__title {
  font-size: 0.9688rem;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .proof .row__meta {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--green-500);
}

/* 结尾入口 */
.page-about .about-cta {
  border-top: 1px solid var(--about-line);
  padding-top: 26px;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

@media (min-width: 640px) {
  .page-about .about-shell {
    padding: 26px 26px 80px;
  }

  .page-about .origin {
    padding: 40px 34px 42px;
  }

  .page-about .reach {
    padding: 36px 30px 32px;
  }

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

@media (min-width: 960px) {
  .page-about .about-shell {
    padding: 34px 40px 96px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
    margin-bottom: 48px;
  }

  .page-about .about-hero__lead h1 {
    margin-top: 12px;
  }

  .page-about .origin {
    padding: 56px 48px 58px;
    margin-bottom: 56px;
  }

  .page-about .evo__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .evo__fig {
    position: sticky;
    top: 28px;
  }

  .page-about .steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team__fig {
    max-width: 760px;
  }

  .page-about .stairs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
    gap: 14px;
    margin: 28px 0 24px;
  }

  .page-about .stairs > *:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .stairs > *:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .stairs > *:nth-child(4) {
    margin-top: 78px;
  }

  .page-about .proof .rows li {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb a,
  .page-about .evo__jump a,
  .page-about .tl-card,
  .page-about .step,
  .page-about .team-card,
  .page-about .stat,
  .page-about .proof .rows li {
    transition: none;
  }
}
<<<END>>>