.page-about {
  --about-line: rgba(240, 233, 221, .14);
  --about-line-soft: rgba(240, 233, 221, .08);
  --about-muted: rgba(240, 233, 221, .62);
  --about-strong: rgba(240, 233, 221, .84);
  --about-pad: clamp(48px, 7vw, 96px);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 3.5vw, 44px) 0 clamp(44px, 6vw, 84px);
  background:
    radial-gradient(900px 520px at 78% 16%, rgba(139, 92, 246, .22), transparent 62%),
    radial-gradient(700px 460px at 10% 84%, rgba(199, 255, 66, .1), transparent 60%),
    var(--ink);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-about .about-hero__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__coord {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-strong);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 3.5vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink);
}

.page-about .about-hero__fact strong {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--lime);
}

.page-about .about-hero__fact span {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--about-muted);
}

.page-about .about-hero__figure {
  margin: clamp(28px, 4vw, 42px) 0 0;
  position: relative;
  border: 1px solid var(--about-line);
  box-shadow: 10px 10px 0 -1px transparent, 10px 10px 0 0 rgba(201, 111, 74, .45);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.page-about .about-hero__visual {
  position: relative;
  min-height: 280px;
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: linear-gradient(158deg, rgba(10, 16, 36, .25), rgba(6, 10, 21, .94)), var(--ink-2);
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(127, 167, 184, .16) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(to bottom, rgba(127, 167, 184, .16) 0 1px, transparent 1px 44px);
  -webkit-mask-image: radial-gradient(circle at 50% 46%, #000 26%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 46%, #000 26%, transparent 78%);
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  top: 20%;
  background: linear-gradient(90deg, transparent, var(--lime), transparent);
  animation: about-scan 8s linear infinite;
}

.page-about .about-hero__blip {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(199, 255, 66, .16), 0 0 18px rgba(199, 255, 66, .7);
}

.page-about .about-hero__blip--a { left: 18%; top: 30%; }
.page-about .about-hero__blip--b { left: 62%; top: 22%; background: var(--violet); box-shadow: 0 0 0 3px rgba(139, 92, 246, .2), 0 0 18px rgba(139, 92, 246, .8); }
.page-about .about-hero__blip--c { left: 44%; top: 64%; background: var(--amber); box-shadow: 0 0 0 3px rgba(255, 158, 74, .18), 0 0 18px rgba(255, 158, 74, .8); }
.page-about .about-hero__blip--d { left: 78%; top: 74%; }

.page-about .about-hero__label {
  position: absolute;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  white-space: nowrap;
  color: rgba(240, 233, 221, .48);
}

.page-about .about-hero__label--a { left: 16px; bottom: 16px; }
.page-about .about-hero__label--b { right: 16px; top: 16px; color: var(--lime); }

@keyframes about-scan {
  0% { top: 8%; opacity: 0; }
  12% { opacity: .72; }
  84% { opacity: .5; }
  100% { top: 92%; opacity: 0; }
}

/* ---------- 01 起点（纸面阅读区） ---------- */
.page-about .about-story {
  position: relative;
  padding: var(--about-pad) 0;
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-story::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--clay) 0 18px, transparent 18px 36px);
  opacity: .55;
}

.page-about .about-story__head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-story .coord {
  color: var(--clay);
  border-color: rgba(201, 111, 74, .5);
}

.page-about .about-story__head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3.4vw, 2.6rem);
  line-height: 1.28;
  color: var(--ink);
  max-width: 20em;
}

.page-about .about-story__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .about-story__text p {
  margin: 0 0 1.05em;
  font-size: 1.0625rem;
  line-height: 1.88;
  color: #202838;
}

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

.page-about .about-story__quote {
  margin: 0;
  padding: 26px 24px 24px 26px;
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.62;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid rgba(58, 64, 72, .32);
  box-shadow: 9px 9px 0 -1px var(--paper), 9px 9px 0 0 rgba(201, 111, 74, .55);
}

.page-about .about-story__quote cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: .72rem;
  letter-spacing: .16em;
  color: rgba(58, 64, 72, .8);
}

/* ---------- 02 体系时间线 ---------- */
.page-about .about-timeline {
  padding: var(--about-pad) 0;
  background: var(--ink-3);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-timeline__rail h2 {
  margin: 16px 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 2.8vw, 2.25rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-timeline__rail p {
  margin: 0 0 14px;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--about-muted);
}

.page-about .about-timeline__rail p:last-child {
  margin-bottom: 0;
  color: var(--moss);
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
}

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

.page-about .tl {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--about-line);
  transition: background .25s ease;
  outline-offset: 4px;
}

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

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

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.2vw, 1.42rem);
  letter-spacing: .04em;
  line-height: 1.1;
  color: var(--moss);
}

.page-about .tl:nth-child(1) .tl__year { color: var(--mist); }
.page-about .tl:nth-child(2) .tl__year { color: var(--clay); }
.page-about .tl:nth-child(3) .tl__year { color: var(--moss); }
.page-about .tl:nth-child(4) .tl__year { color: var(--lime); }
.page-about .tl:nth-child(5) .tl__year { color: var(--violet); }

.page-about .tl__body h3 {
  margin: 0 0 6px;
  font-size: clamp(1rem, 1.7vw, 1.14rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .tl__body p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.76;
  color: var(--about-muted);
}

.page-about .tl__detail {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid rgba(199, 255, 66, .42);
  font-family: var(--font-mono);
  font-size: .79rem;
  line-height: 1.72;
  color: rgba(199, 255, 66, .78);
}

.page-about .about-timeline__figure {
  margin: clamp(26px, 4vw, 38px) 0 0;
  border: 1px solid var(--about-line);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-timeline__figure figcaption {
  padding: 12px 14px;
  font-size: .78rem;
  line-height: 1.6;
  color: rgba(240, 233, 221, .5);
  border-top: 1px solid var(--about-line-soft);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  padding: var(--about-pad) 0;
  background: var(--ink-2);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .sec-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.2vw, 2.5rem);
  line-height: 1.28;
  color: var(--paper);
  max-width: 22em;
}

.page-about .sec-head p {
  margin: 0;
  max-width: 44em;
  font-size: clamp(.95rem, 1.4vw, 1.02rem);
  line-height: 1.82;
  color: var(--about-muted);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .legend {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .legend__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .legend__key {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--ink);
  background: var(--moss);
}

.page-about .legend__item:nth-child(2) .legend__key { background: var(--clay); }
.page-about .legend__item:nth-child(3) .legend__key { background: var(--lime); }

.page-about .legend__title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .legend__count {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  padding: 2px 8px;
  border: 1px solid rgba(240, 233, 221, .24);
  color: var(--about-strong);
}

.page-about .legend__item p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--about-line);
  box-shadow: 8px 8px 0 -1px transparent, 8px 8px 0 0 rgba(139, 92, 246, .38);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-team__flow {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 20px 22px;
  border-left: 3px solid var(--violet);
  background: linear-gradient(100deg, rgba(139, 92, 246, .16), rgba(139, 92, 246, 0) 72%);
  font-size: .95rem;
  line-height: 1.82;
  color: var(--about-strong);
}

/* ---------- 04 生态 ---------- */
.page-about .about-eco {
  padding: var(--about-pad) 0;
  background: var(--ink);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .eco-wall {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .eco-tag {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px 22px;
  background: var(--ink);
  transition: background .25s ease;
}

.page-about .eco-tag::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .25s ease;
}

.page-about .eco-tag:hover {
  background: var(--ink-2);
}

.page-about .eco-tag:hover::before {
  transform: scaleY(1);
}

.page-about .eco-tag__idx {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: rgba(240, 233, 221, .44);
}

.page-about .eco-tag__name {
  font-family: var(--font-serif);
  font-size: 1.16rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .eco-tag__benefit {
  margin-top: auto;
  font-size: .85rem;
  line-height: 1.66;
  color: var(--moss);
  transition: color .25s ease;
}

.page-about .eco-tag:hover .eco-tag__benefit {
  color: var(--lime);
}

.page-about .eco-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 28px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .eco-stat {
  padding-top: 12px;
  border-top: 2px solid var(--clay);
}

.page-about .eco-stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.5vw, 1.7rem);
  font-weight: 500;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .eco-stat span {
  display: block;
  margin-top: 6px;
  font-size: .8rem;
  line-height: 1.55;
  color: rgba(240, 233, 221, .55);
}

/* ---------- 05 服务流程 ---------- */
.page-about .about-promise {
  padding: var(--about-pad) 0;
  background: var(--ink-3);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .pledge {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}

.page-about .pledge__item {
  padding: 24px 20px 26px;
  background: var(--ink-3);
}

.page-about .pledge__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--clay);
}

.page-about .pledge__item h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 1.14rem;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .pledge__item p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .about-promise__note {
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 20px 22px;
  border: 1px dashed rgba(199, 255, 66, .38);
  background: rgba(199, 255, 66, .05);
  font-size: .92rem;
  line-height: 1.84;
  color: var(--about-strong);
}

.page-about .about-promise__note a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-promise__note a:hover {
  color: var(--amber);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  padding: clamp(44px, 6vw, 80px) 0 clamp(52px, 8vw, 100px);
  background:
    radial-gradient(700px 380px at 22% 30%, rgba(139, 92, 246, .2), transparent 66%),
    var(--ink);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-next__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-about .about-next__text h2 {
  margin: 16px 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-next__text p {
  margin: 0;
  max-width: 40em;
  font-size: .97rem;
  line-height: 1.85;
  color: var(--about-muted);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .tl {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }
}

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .eco-wall {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-story__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
  }
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  }
  .page-about .pledge {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .eco-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
  .page-about .about-hero__visual {
    min-height: 520px;
    position: sticky;
    top: clamp(24px, 6vh, 72px);
  }
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, .42fr) minmax(0, .58fr);
  }
  .page-about .about-timeline__rail {
    position: sticky;
    top: clamp(24px, 6vh, 72px);
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

@media (min-width: 1000px) {
  .page-about .eco-wall {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .tl__detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-left: 0;
    border-left-width: 0;
    transition: max-height .32s ease, opacity .26s ease, margin-top .26s ease, padding-left .26s ease, border-left-width .26s ease;
  }
  .page-about .tl:hover,
  .page-about .tl:focus {
    background: linear-gradient(90deg, rgba(199, 255, 66, .06), transparent 72%);
  }
  .page-about .tl:hover .tl__detail,
  .page-about .tl:focus .tl__detail,
  .page-about .tl:focus-within .tl__detail {
    max-height: 12em;
    opacity: 1;
    margin-top: 10px;
    padding-left: 12px;
    border-left-width: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__visual::after {
    animation: none;
    opacity: .4;
  }
  .page-about .tl,
  .page-about .eco-tag,
  .page-about .eco-tag::before,
  .page-about .eco-tag__benefit {
    transition: none;
  }
}
<<<END>>>