.page-about {
  --about-line: rgba(157, 178, 200, .26);
  --about-line-soft: rgba(157, 178, 200, .14);
  background: var(--ink);
  color: var(--cream);
}

.page-about .sec-head {
  display: block;
  margin-bottom: 32px;
}

.page-about .sec-head h2 {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5.2vw, 44px);
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--white);
  margin: 8px 0 10px;
}

.page-about .sec-head .chapter-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(56px, 11vw, 132px);
  line-height: .82;
  letter-spacing: .02em;
  color: rgba(53, 228, 208, .08);
  -webkit-text-stroke: 1.1px rgba(53, 228, 208, .55);
}

.page-about .sec-sub {
  max-width: 46ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}

.page-about .sec-head--wide {
  margin-bottom: 40px;
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding: calc(var(--header-h) + 44px) 0 56px;
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(255, 90, 43, .20), transparent 58%),
    radial-gradient(90% 80% at 6% 96%, rgba(53, 228, 208, .14), transparent 60%),
    linear-gradient(168deg, var(--ink-deep) 0%, var(--ink) 52%, var(--ink-2) 100%);
  overflow: hidden;
}

.about-hero__inner {
  position: relative;
  z-index: 2;
}

.about-hero .breadcrumb {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  margin-bottom: 28px;
}

.about-hero .breadcrumb a {
  color: var(--neon);
  text-decoration: none;
}

.about-hero .breadcrumb a:hover {
  text-decoration: underline;
}

.about-hero .breadcrumb span[aria-current] {
  color: var(--cream);
}

.about-hero h1 {
  max-width: 17ch;
  font-family: var(--font-headline);
  font-size: clamp(34px, 7.4vw, 70px);
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--white);
  margin: 10px 0 20px;
}

.about-hero .lead {
  max-width: 60ch;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.75;
  color: var(--cream);
  margin: 0 0 36px;
}

.about-figs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.about-figs__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-left: 3px solid var(--neon);
  background: rgba(18, 51, 84, .55);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.about-figs__item:nth-child(2) {
  border-left-color: var(--flame);
}

.about-figs__item:nth-child(3) {
  border-left-color: var(--peri);
}

.about-figs__num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--white);
}

.about-figs__cap {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

.about-hero__glow {
  position: absolute;
  right: -120px;
  bottom: -160px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 90, 43, .26), transparent 68%);
  pointer-events: none;
}

/* ---------- 01 起点 ---------- */
.origin {
  background: var(--cream);
  color: var(--brown);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .origin .sec-head h2 {
  color: var(--brown);
}

.page-about .origin .sec-head .chapter-num {
  color: rgba(26, 20, 16, .07);
  -webkit-text-stroke: 1.1px rgba(26, 20, 16, .38);
}

.page-about .origin .sec-sub {
  color: #6b5c4c;
}

.origin__colA {
  font-size: 16px;
  line-height: 1.8;
}

.origin__colA p {
  margin: 0 0 16px;
}

.origin__colB {
  margin-top: 26px;
  background: var(--ink);
  color: var(--cream);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.origin__colB .card__title {
  font-family: var(--font-headline);
  font-size: 20px;
  color: var(--neon);
  margin: 0 0 14px;
}

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

.origin__list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  padding-left: 16px;
  position: relative;
}

.origin__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--flame);
}

.origin__list strong {
  display: block;
  color: var(--cream);
  font-weight: 600;
  margin-bottom: 2px;
}

.origin__figure {
  margin: 30px 0 0;
}

/* ---------- 02 时间轴 ---------- */
.trail-sec {
  background: var(--ink);
  background-image: linear-gradient(180deg, rgba(18, 51, 84, .55), rgba(10, 26, 44, 0) 42%);
}

.trail {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.trail::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon), var(--peri) 55%, var(--flame));
  opacity: .5;
}

.trail__item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 18px;
}

.trail__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--neon);
  background: var(--ink);
  z-index: 1;
}

.trail__item:last-child {
  margin-bottom: 0;
}

.trail__item:last-child::before {
  border-color: var(--flame);
}

.trail__node {
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(18, 51, 84, .42);
  overflow: hidden;
}

.trail__node[open] {
  background: rgba(18, 51, 84, .78);
  border-color: rgba(53, 228, 208, .34);
  box-shadow: var(--shadow-card);
}

.trail__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

.trail__head::-webkit-details-marker {
  display: none;
}

.trail__headL {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.trail__year {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(46px, 10vw, 96px);
  line-height: .84;
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
  color: rgba(53, 228, 208, .1);
  -webkit-text-stroke: 1.1px rgba(53, 228, 208, .8);
}

.trail__item:last-child .trail__year {
  color: rgba(255, 90, 43, .1);
  -webkit-text-stroke: 1.1px rgba(255, 90, 43, .85);
}

.trail__stage {
  font-family: var(--font-headline);
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--cream);
}

.trail__plus {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border: 1px solid var(--about-line);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--neon);
  font-family: var(--font-numeric);
  font-size: 15px;
  line-height: 1;
  transition: transform 200ms var(--ease), background 200ms var(--ease);
}

.trail__plus::before {
  content: "+";
}

.trail__node[open] .trail__plus {
  background: rgba(53, 228, 208, .12);
}

.trail__node[open] .trail__plus::before {
  content: "\2212";
}

.trail__body {
  padding: 0 18px 20px;
  animation: about-fade 240ms var(--ease);
}

@keyframes about-fade {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.trail__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.trail__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.trail__points li {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--neon);
  padding-left: 18px;
  position: relative;
}

.trail__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 1px;
  background: var(--neon);
}

/* ---------- 03 团队 ---------- */
.crew-sec {
  background: var(--cream);
  color: var(--brown);
}

.page-about .crew-sec .sec-head h2 {
  color: var(--brown);
}

.page-about .crew-sec .sec-head .chapter-num {
  color: rgba(26, 20, 16, .07);
  -webkit-text-stroke: 1.1px rgba(26, 20, 16, .38);
}

.page-about .crew-sec .sec-sub {
  color: #6b5c4c;
}

.crew__bar {
  display: flex;
  flex-direction: column;
  gap: 3px;
  border-radius: var(--radius);
  overflow: hidden;
}

.crew__seg {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 16px 18px;
  background: var(--ink);
  border-left: 4px solid var(--neon);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.crew__seg--edit { border-left-color: var(--flame); }
.crew__seg--proof { border-left-color: var(--amber); }
.crew__seg--serve { border-left-color: var(--neon); }
.crew__seg--tech { border-left-color: var(--peri); }

.crew__seg:hover {
  transform: translateX(3px);
  box-shadow: inset 0 0 0 1px rgba(53, 228, 208, .3);
}

.crew__n {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  line-height: 1;
  color: var(--white);
}

.crew__role {
  font-family: var(--font-headline);
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--mist);
}

.crew__notes {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.crew__notes li {
  font-size: 15px;
  line-height: 1.75;
  color: #3d322a;
  padding-left: 18px;
  border-left: 2px solid rgba(26, 20, 16, .16);
}

.crew__notes strong {
  color: var(--brown);
  font-weight: 700;
}

.crew__figure {
  margin: 32px 0 0;
}

/* ---------- 04 流程 ---------- */
.flow-sec {
  background: var(--ink);
}

.flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.flow__step {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.flow__step:first-child {
  border-top: 1px solid var(--about-line-soft);
}

.flow__idx {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--flame);
  padding-top: 4px;
}

.flow__txt h3 {
  font-family: var(--font-headline);
  font-size: 20px;
  line-height: 1.25;
  color: var(--white);
  margin: 0 0 8px;
}

.flow__txt p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.flow__foot {
  margin: 28px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--neon);
  background: rgba(18, 51, 84, .5);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cream);
}

/* ---------- 05 覆盖范围 ---------- */
.reach-sec {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
}

.reach__body p {
  font-size: 16px;
  line-height: 1.82;
  color: var(--cream);
  margin: 0 0 16px;
}

.reach__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 26px 0 0;
}

.reach__facts > div {
  background: rgba(10, 26, 44, .92);
  padding: 16px 18px;
}

.reach__facts dt {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
  margin-bottom: 6px;
}

.reach__facts dd {
  margin: 0;
  font-size: 16px;
  color: var(--cream);
}

.reach__facts .num {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  color: var(--neon);
}

.reach__figure {
  margin: 32px 0 0;
}

/* ---------- 06 伙伴 ---------- */
.partner-sec {
  background: var(--cream);
  color: var(--brown);
}

.page-about .partner-sec .sec-head h2 {
  color: var(--brown);
}

.page-about .partner-sec .sec-head .chapter-num {
  color: rgba(26, 20, 16, .07);
  -webkit-text-stroke: 1.1px rgba(26, 20, 16, .38);
}

.page-about .partner-sec .sec-sub {
  color: #6b5c4c;
}

.partner__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.partner__card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 22px 20px;
  border: 1px solid rgba(26, 20, 16, .1);
}

.partner__n {
  font-family: var(--font-numeric);
  font-variant-numeric: tabular-nums;
  font-size: 42px;
  line-height: 1;
  margin: 0 0 8px;
  color: var(--flame);
}

.partner__card h3 {
  font-family: var(--font-headline);
  font-size: 20px;
  line-height: 1.28;
  color: var(--brown);
  margin: 0 0 10px;
}

.partner__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #4a3e34;
}

.partner__card--wide {
  background: var(--ink);
  color: var(--cream);
  border-color: transparent;
  padding: 26px 22px;
}

.partner__card--wide h3 {
  color: var(--white);
  font-size: 22px;
}

.partner__card--wide p {
  color: var(--mist);
}

.partner__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px !important;
}

/* ---------- 结尾 ---------- */
.about-cta {
  background:
    radial-gradient(80% 120% at 12% 0%, rgba(53, 228, 208, .16), transparent 62%),
    var(--ink-deep);
  border-top: 1px solid var(--about-line-soft);
}

.about-cta__inner h2 {
  font-family: var(--font-headline);
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1.12;
  color: var(--white);
  margin: 10px 0 16px;
}

.about-cta__inner p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  margin: 0 0 24px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .about-figs {
    grid-template-columns: repeat(3, 1fr);
  }

  .trail__item {
    padding-left: 42px;
  }

  .trail::before {
    left: 9px;
  }

  .trail__item::before {
    width: 19px;
    height: 19px;
  }

  .flow__step {
    grid-template-columns: 72px 1fr;
    gap: 20px;
  }

  .reach__facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .partner__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .partner__card--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .about-hero {
    padding: calc(var(--header-h-solid) + 76px) 0 88px;
  }

  .about-figs__num {
    font-size: 34px;
  }

  .origin .grid-12 {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: 24px;
  }

  .origin .sec-head {
    grid-column: 1 / 8;
  }

  .origin__colA {
    grid-column: 1 / 7;
    margin-top: 8px;
  }

  .origin__colB {
    grid-column: 8 / 13;
    margin-top: 8px;
  }

  .origin__figure {
    grid-column: 1 / 13;
    margin-top: 40px;
  }

  .trail__head {
    align-items: center;
    padding: 22px 26px 20px;
  }

  .trail__headL {
    flex-direction: row;
    align-items: baseline;
    gap: 26px;
  }

  .trail__year {
    min-width: 190px;
    font-size: 92px;
  }

  .trail__body {
    padding: 0 26px 26px 242px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .trail__item {
    margin-bottom: 24px;
  }

  .crew__bar {
    flex-direction: row;
    gap: 2px;
  }

  .crew__seg {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 22px 18px;
    border-left: none;
    border-top: 4px solid var(--neon);
    min-width: 0;
  }

  .crew__seg--edit {
    flex: 6;
    border-top-color: var(--flame);
  }

  .crew__seg--proof {
    flex: 4;
    border-top-color: var(--amber);
  }

  .crew__seg--serve {
    flex: 5;
    border-top-color: var(--neon);
  }

  .crew__seg--tech {
    flex: 3;
    border-top-color: var(--peri);
  }

  .crew__seg:hover {
    transform: translateY(-2px);
  }

  .crew__notes {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 26px;
  }

  .crew__figure {
    margin-top: 40px;
  }

  .flow__step {
    grid-template-columns: 96px 1fr;
  }

  .reach-sec .grid-12 {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: 28px;
  }

  .reach-sec .sec-head {
    grid-column: 1 / 13;
  }

  .reach__body {
    grid-column: 1 / 7;
  }

  .reach__figure {
    grid-column: 7 / 13;
    margin-top: 0;
    align-self: start;
  }

  .reach__facts {
    grid-template-columns: repeat(2, 1fr);
  }

  .partner__card--wide {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    column-gap: 32px;
  }

  .partner__card--wide h3 {
    grid-column: 1;
  }

  .partner__card--wide p {
    grid-column: 1;
  }

  .partner__links {
    grid-column: 2;
    margin-top: 0 !important;
    flex-direction: column;
    align-items: stretch;
  }
}

@media (min-width: 1120px) {
  .origin .sec-head {
    grid-column: 1 / 6;
  }

  .trail__year {
    min-width: 220px;
    font-size: 108px;
  }

  .trail__body {
    padding-left: 272px;
    grid-template-columns: minmax(0, 1fr) minmax(0, 260px);
    grid-template-areas: "p pts";
    column-gap: 34px;
    align-items: start;
  }

  .trail__body p {
    grid-area: p;
  }

  .trail__points {
    grid-area: pts;
    margin-top: 2px;
  }

  .reach__body {
    grid-column: 1 / 8;
  }

  .reach__figure {
    grid-column: 8 / 13;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .trail__body {
    animation: none;
  }

  .page-about .crew__seg,
  .page-about .trail__plus {
    transition: none;
  }
}
<<<END>>>