.page-about {
  --about-measure: 34ch;
  --about-pad-block: clamp(3.25rem, 8vw, 6.75rem);
  --about-idx-w: 5.25rem;
  --about-line-paper: rgba(36, 28, 20, 0.16);
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 首屏：文字建筑 ---------- */
.page-about .about-hero {
  padding: clamp(2.25rem, 6vw, 4.5rem) 0 clamp(3rem, 7vw, 6rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-tag {
  margin: 0;
  color: var(--cyan);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.35rem, 8.4vw, 5.75rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  margin: 0;
  max-width: 16ch;
  color: var(--text);
}

.page-about .about-hero__body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  align-self: end;
}

.page-about .about-hero__body .lead {
  margin: 0;
  max-width: 40ch;
  font-size: clamp(1.0625rem, 2vw, 1.1875rem);
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-hero__body p {
  margin: 0;
  max-width: 40ch;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.35rem;
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 5rem);
    row-gap: 0.75rem;
    align-items: end;
  }

  .page-about .about-tag {
    grid-column: 1 / -1;
  }

  .page-about .about-hero__title {
    grid-column: 1;
  }

  .page-about .about-hero__body {
    grid-column: 2;
  }
}

/* ---------- 通用段落骨架 ---------- */
.page-about .about-sect {
  padding: var(--about-pad-block) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sect__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .about-sect__idx {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.2vw, 1.5rem);
  font-weight: 400;
  letter-spacing: 0.1em;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-sect__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.8rem, 4.6vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 1.35rem;
  max-width: 22ch;
  color: var(--text);
}

.page-about .about-sect__text {
  color: var(--text-dim);
  font-size: 1.0625rem;
  line-height: 1.78;
}

.page-about .about-sect__text p {
  margin: 0 0 1.05rem;
  max-width: var(--about-measure);
}

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

@media (min-width: 880px) {
  .page-about .about-sect__inner {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    column-gap: clamp(1.25rem, 3.5vw, 3rem);
    align-items: start;
  }
}

/* ---------- 双栏图文 ---------- */
.page-about .about-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.75rem);
  align-items: start;
}

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

.page-about .about-figure img,
.page-about .about-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .about-figure__cap {
  display: block;
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--index);
}

@media (min-width: 1000px) {
  .page-about .about-cols--media-last {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
  }

  .page-about .about-cols--media-last .about-figure {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-cols--media-last .about-sect__text {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-cols--media-first {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1fr);
  }

  .page-about .about-cols--media-first .about-figure {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-cols--media-first .about-sect__text {
    grid-column: 2;
    grid-row: 1;
  }
}

/* ---------- 栏目分段控件 ---------- */
.page-about .about-sect--cols {
  background: linear-gradient(180deg, var(--ink) 0%, var(--carbon) 52%, var(--ink) 100%);
}

.page-about .about-tabs {
  margin-top: 2rem;
}

.page-about .about-tabs .tabs__list {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-about .about-tabs .tabs__tab {
  flex: 0 0 auto;
  padding: 0.5rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-about .about-col {
  padding-top: 1.5rem;
}

.page-about .about-col__intro {
  margin: 0;
  max-width: 42ch;
  color: var(--text-dim);
  font-size: 1.0625rem;
  line-height: 1.78;
}

.page-about .about-col__list {
  list-style: none;
  margin: 1.15rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  max-width: 44ch;
}

.page-about .about-col__list li {
  position: relative;
  padding-left: 1.15rem;
  color: var(--text);
  font-size: 0.9688rem;
  line-height: 1.72;
}

.page-about .about-col__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.5rem;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-sect--time {
  position: relative;
}

.page-about .about-sect--time::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: clamp(6rem, 22vw, 17rem);
  height: 100%;
  pointer-events: none;
  background: repeating-linear-gradient(
    145deg,
    rgba(123, 92, 255, 0.14) 0 1px,
    transparent 1px 15px
  );
}

.page-about .about-banner {
  margin: 0 0 clamp(2.25rem, 5vw, 3.25rem);
}

.page-about .about-time {
  position: relative;
  padding-left: 0;
}

.page-about .about-time::before {
  content: "";
  position: absolute;
  left: 0.3rem;
  top: 0.75rem;
  bottom: 1.5rem;
  width: 2px;
  background: repeating-linear-gradient(
    160deg,
    var(--cyan) 0 7px,
    transparent 7px 15px
  );
}

.page-about .about-time__item {
  position: relative;
  padding: 0 0 1.9rem 2rem;
}

.page-about .about-time__item:last-child {
  padding-bottom: 0;
}

.page-about .about-time__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-time__item:nth-child(2)::before {
  background: var(--violet);
}

.page-about .about-time__item:nth-child(3)::before {
  background: var(--cyan);
}

.page-about .about-time__item:nth-child(4)::before {
  background: var(--orange);
}

.page-about .about-time__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.85rem;
  cursor: pointer;
  list-style: none;
  padding-right: 2rem;
}

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

.page-about .about-time__sum::after {
  content: "＋";
  order: 9;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-time__item[open] .about-time__sum::after {
  content: "－";
}

.page-about .about-time__ver {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-time__item:nth-child(2) .about-time__ver {
  color: var(--violet);
}

.page-about .about-time__item:nth-child(4) .about-time__ver {
  color: var(--orange);
}

.page-about .about-time__name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.0625rem, 2.4vw, 1.4rem);
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-time__when {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--index);
}

.page-about .about-time__body {
  padding-top: 0.85rem;
  max-width: 46ch;
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.78;
}

.page-about .about-time__body p {
  margin: 0;
}

/* ---------- 奶油纸档案段 ---------- */
.page-about .about-sect--paper {
  background: var(--paper);
  color: var(--paper-ink);
  border-bottom: 0;
  padding-block: calc(var(--about-pad-block) + 2.25rem);
  clip-path: polygon(0 2rem, 100% 0, 100% calc(100% - 2rem), 0 100%);
}

.page-about .about-sect--paper .about-sect__idx {
  color: var(--paper-ink);
  opacity: 0.34;
}

.page-about .about-sect--paper .about-sect__title {
  color: var(--paper-ink);
}

.page-about .about-sect--paper .about-sect__text {
  color: #3d3125;
}

.page-about .about-sect--paper .about-sect__text p {
  max-width: 36ch;
}

.page-about .about-sect--paper .about-figure img {
  border-color: var(--about-line-paper);
}

.page-about .about-sect--paper .about-figure__cap {
  color: #6b5b49;
}

/* ---------- 规模数字 ---------- */
.page-about .about-scale {
  padding: var(--about-pad-block) 0;
  background: radial-gradient(
    120% 80% at 82% 0%,
    rgba(47, 243, 208, 0.09) 0%,
    transparent 58%
  );
}

.page-about .about-scale__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.8rem, 4.6vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  color: var(--text);
}

.page-about .about-scale__lead {
  margin: 0;
  max-width: 44ch;
  color: var(--text-dim);
  font-size: 1.0625rem;
  line-height: 1.78;
}

.page-about .about-scale__grid {
  list-style: none;
  margin: clamp(2.25rem, 5vw, 3.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 2.25rem 1.5rem;
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-scale__figure {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 5.4vw, 3.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-scale__unit {
  font-family: var(--font-mono);
  font-size: clamp(0.875rem, 1.6vw, 1.0625rem);
  color: var(--violet);
}

.page-about .about-scale__cap {
  max-width: 20ch;
  color: var(--text-dim);
  font-size: 0.9375rem;
  line-height: 1.66;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  padding: 0 0 clamp(3.5rem, 9vw, 7rem);
}

.page-about .about-close__inner {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  padding-top: clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid var(--line);
}

.page-about .about-close__lead {
  margin: 0;
  max-width: 40ch;
  font-size: clamp(1.0625rem, 2.2vw, 1.3125rem);
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

@media (min-width: 860px) {
  .page-about .about-close__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 2.5rem;
  }

  .page-about .about-close__links {
    justify-content: flex-end;
  }
}

/* ---------- 无障碍与减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-sect--time::after {
    background: none;
  }
}
<<<END>>>