.page-about {
  --about-measure: 64ch;
  --about-plate-gap: clamp(14px, 2vw, 20px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-crumb {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-hero {
  padding-block: clamp(28px, 5vw, 56px) clamp(40px, 6vw, 72px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line);
  padding: clamp(22px, 3.4vw, 46px);
  background:
    radial-gradient(115% 130% at 88% 2%, rgba(53, 224, 208, 0.09), transparent 58%),
    linear-gradient(180deg, rgba(242, 246, 250, 0.045), rgba(242, 246, 250, 0.012));
}

.page-about .about-hero__frame .corner {
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.page-about .about-hero__frame .corner-tl {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--cyan-400);
  border-left: 2px solid var(--cyan-400);
}

.page-about .about-hero__frame .corner-tr {
  top: -1px;
  right: -1px;
  border-top: 2px solid var(--cyan-400);
  border-right: 2px solid var(--cyan-400);
}

.page-about .about-hero__frame .corner-bl {
  bottom: -1px;
  left: -1px;
  border-bottom: 2px solid var(--cyan-400);
  border-left: 2px solid var(--cyan-400);
}

.page-about .about-hero__frame .corner-br {
  bottom: -1px;
  right: -1px;
  border-bottom: 2px solid var(--cyan-400);
  border-right: 2px solid var(--cyan-400);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-hero__title {
  margin: var(--about-plate-gap) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 5.4vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.6vw, 24px) 0 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.84) contrast(1.05);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-hero__k {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体：目录 + 长文 ---------- */
.page-about .about-body {
  margin-top: clamp(44px, 6vw, 84px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 5vw, 64px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(40px, 5.5vw, 84px);
  }
}

.page-about .about-toc {
  align-self: start;
}

.page-about .about-toc__title {
  margin: 0 0 14px;
  color: var(--muted);
}

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

.page-about .about-toc__link {
  display: block;
  padding: 9px 0 9px 16px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--white);
  border-left-color: var(--cyan-200);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--cyan-400);
  border-left-color: var(--cyan-400);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--orange-500);
  margin-right: 9px;
}

@media (min-width: 1000px) {
  .page-about .about-toc {
    position: sticky;
    top: 30px;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--line);
  padding-top: clamp(28px, 4vw, 42px);
  margin-top: clamp(44px, 6vw, 74px);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.page-about .about-section__title {
  margin: var(--about-plate-gap) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--white);
  max-width: 22ch;
}

.page-about .about-section__lead {
  margin: clamp(14px, 2vw, 18px) 0 0;
  max-width: var(--about-measure);
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-p {
  margin: 16px 0 0;
  max-width: var(--about-measure);
  color: rgba(242, 246, 250, 0.88);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-section__title + .about-p {
  margin-top: clamp(14px, 2vw, 18px);
}

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  position: relative;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange-500);
  overflow: hidden;
  background: linear-gradient(90deg, rgba(255, 106, 43, 0.06), transparent 62%);
}

.page-about .about-quote__mark {
  position: absolute;
  right: 14px;
  bottom: -14px;
  font-size: clamp(64px, 11vw, 118px);
  font-weight: 700;
  line-height: 1;
  color: rgba(242, 246, 250, 0.05);
  pointer-events: none;
  user-select: none;
}

.page-about .about-quote blockquote {
  margin: 0;
  position: relative;
}

.page-about .about-quote p {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.7;
  color: var(--white);
}

/* ---------- 批次区块 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 38px);
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-split__main .about-p:first-child {
  margin-top: 0;
}

.page-about .about-batch-collapse {
  margin-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid var(--line);
  padding-top: clamp(18px, 2.4vw, 24px);
}

.page-about .about-batchcard {
  padding: clamp(20px, 3vw, 26px);
  border: 1px solid var(--line);
}

.page-about .about-batchcard__label {
  margin: 0;
  color: var(--muted);
}

.page-about .about-batchcard__num {
  margin: 10px 0 0;
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 6vw, 48px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-batchgrid {
  position: relative;
  margin-top: clamp(18px, 2.6vw, 24px);
  width: 100%;
  aspect-ratio: 10 / 6;
  border: 1px solid var(--line);
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: calc(100% / 10) calc(100% / 6);
}

.page-about .about-batchgrid::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(53, 224, 208, 0.16), transparent 58%);
}

.page-about .about-batchcard__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--muted);
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 268px;
    align-items: start;
  }
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 42px);
  margin-top: clamp(24px, 3.4vw, 34px);
}

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

.page-about .about-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(18px, 2.6vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--orange-500);
  padding-top: 4px;
}

.page-about .about-step__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-step__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
  max-width: 48ch;
}

.page-about .about-step__meta {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
}

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

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-flow__caption {
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) 296px;
    align-items: start;
  }
}

/* ---------- 班组标签页 ---------- */
.page-about .about-tabs {
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .about-tabs .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 0;
  margin: 0 0 clamp(20px, 3vw, 28px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-tabs .tab {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 0;
  border-radius: var(--radius);
  padding: 11px 16px;
  margin-bottom: -1px;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.4;
  color: var(--muted);
  cursor: pointer;
  transition: color 180ms ease, background-color 180ms ease;
}

.page-about .about-tabs .tab:hover {
  color: var(--white);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  color: var(--cyan-400);
  background-color: rgba(53, 224, 208, 0.09);
}

.page-about .about-panel {
  max-width: 62ch;
}

.page-about .about-panel__title {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-panel__text {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(242, 246, 250, 0.86);
}

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

.page-about .about-panel__list li {
  position: relative;
  padding: 9px 0 9px 20px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-panel__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 18px;
  width: 6px;
  height: 1px;
  background: var(--cyan-400);
}

.page-about .about-panel__meta {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--orange-500);
}

/* ---------- 版本阶段 ---------- */
.page-about .about-timeline__backdrop {
  margin: clamp(22px, 3.4vw, 32px) 0 clamp(20px, 3vw, 28px);
}

.page-about .about-timeline__backdrop img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--line);
  opacity: 0.92;
}

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

.page-about .about-tl + .about-tl {
  border-top: 0;
}

.page-about .about-tl__trigger {
  display: flex;
  align-items: baseline;
  gap: 14px;
  width: 100%;
}

.page-about .about-tl__trigger::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan-400);
}

.page-about .about-tl__trigger[aria-expanded="true"]::after {
  content: "−";
  color: var(--orange-500);
}

.page-about .about-tl__stage {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-500);
  min-width: 48px;
}

.page-about .about-tl__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-tl__panel {
  padding-bottom: 6px;
}

.page-about .about-tl__panel .about-p {
  margin-top: 0;
  max-width: 60ch;
  font-size: 16px;
  color: var(--muted);
}

/* ---------- 备案表 ---------- */
.page-about .about-spec {
  margin: clamp(22px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-spec__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-spec__row dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-spec__row dd {
  margin: 0;
  font-size: 16px;
  color: var(--white);
}

@media (min-width: 700px) {
  .page-about .about-spec__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  margin-top: clamp(48px, 7vw, 84px);
  border: 1px solid var(--line);
  padding: clamp(24px, 4vw, 42px);
  background: linear-gradient(180deg, rgba(242, 246, 250, 0.045), rgba(242, 246, 250, 0.008));
}

.page-about .about-next__list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-next__list li {
  border-top: 1px solid var(--line);
}

.page-about .about-next__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--white);
  text-decoration: none;
  transition: color 180ms ease;
}

.page-about .about-next__list a::after {
  content: "→";
  flex: none;
  font-family: var(--font-mono);
  color: var(--cyan-400);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--cyan-400);
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero__frame {
    padding: 20px 16px;
  }
  .page-about .about-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }
  .page-about .about-tabs .tab {
    padding: 10px 12px;
    font-size: 14px;
  }
}
<<<END>>>