.page-about {
  --about-line: 1px solid var(--grid);
  --about-pad-y: clamp(52px, 8vw, 104px);
  --about-pad-y-tight: clamp(34px, 5vw, 60px);
  display: block;
  color: var(--mist);
}

/* ---------- 章节节奏 ---------- */
.page-about .about-band {
  position: relative;
  padding-block: var(--about-pad-y);
}
.page-about .about-band--tight {
  padding-block: var(--about-pad-y-tight);
}
.page-about .about-band--deep {
  background: linear-gradient(180deg, var(--dome) 0%, var(--ink) 100%);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 48px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
  margin-top: clamp(22px, 4vw, 44px);
}
.page-about .about-hero__grid > * {
  min-width: 0;
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-h);
  font-weight: 900;
  font-size: clamp(38px, 9.4vw, 96px);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--mist);
}
.page-about .about-hero__accent {
  color: var(--gold);
  text-shadow: 0 0 42px rgba(231, 178, 75, 0.28);
}
.page-about .about-hero__meta {
  border-left: 2px solid var(--gold-deep);
  padding-left: 16px;
}
.page-about .about-hero__meta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--haze);
  max-width: 30em;
}
.page-about .about-hero__lede {
  margin: clamp(22px, 4vw, 40px) 0 0;
  max-width: 42em;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
    gap: clamp(28px, 5vw, 72px);
  }
  .page-about .about-hero__meta {
    padding-bottom: 8px;
  }
}

/* ---------- 图像容器 ---------- */
.page-about .about-figure {
  position: relative;
  margin: clamp(26px, 4vw, 44px) 0 0;
  border: var(--about-line);
  background: var(--ink);
  overflow: hidden;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure__caption {
  padding: 10px 14px;
  border-top: var(--about-line);
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--haze);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: var(--about-line);
}
.page-about .about-stat {
  background: var(--ink);
  padding: 20px 16px 22px;
  min-width: 0;
}
.page-about .about-stat__value {
  display: block;
  font-family: var(--font-m);
  font-size: clamp(26px, 6.4vw, 40px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--gold);
}
.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--haze);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-stat {
    padding: 24px 20px 26px;
  }
}

/* ---------- 窄栏长文 + 侧标 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(16px, 3vw, 32px);
}
.page-about .about-split__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.page-about .about-split__index {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}
.page-about .about-prose {
  max-width: 34em;
}
.page-about .about-prose > p {
  margin: 0 0 16px;
}
.page-about .about-prose > p:last-child {
  margin-bottom: 0;
}
.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 227, 208, 0.42);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .about-link:hover {
  color: var(--gold-lit);
  border-bottom-color: var(--gold);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(24px, 5vw, 76px);
  }
  .page-about .about-split__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-top: 6px;
  }
}

/* ---------- 六类内容网格 ---------- */
.page-about .about-six__lede {
  margin-top: 14px;
  max-width: 40em;
}
.page-about .about-six {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 4vw, 40px);
  background: var(--grid);
  border: var(--about-line);
}
.page-about .about-six__cell {
  background: var(--ink);
  padding: 22px 18px 26px;
  min-width: 0;
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.page-about .about-six__cell:hover {
  background: var(--dome);
  box-shadow: inset 3px 0 0 var(--gold);
}
.page-about .about-six__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-about .about-six__label {
  margin: 10px 0 0;
  font-family: var(--font-h);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--mist);
}
.page-about .about-six__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--haze);
}

@media (min-width: 640px) {
  .page-about .about-six {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 980px) {
  .page-about .about-six {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-six__cell {
    padding: 26px 24px 30px;
  }
}

/* ---------- 双版本并列 ---------- */
.page-about .about-versions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 4vw, 40px);
  background: var(--grid);
  border: var(--about-line);
}
.page-about .about-version {
  background: var(--ink);
  padding: 26px 20px 30px;
  min-width: 0;
  transition: background 0.35s var(--ease);
}
.page-about .about-version--v2 {
  border-top: 2px solid var(--cyan);
}
.page-about .about-version--v4 {
  border-top: 2px solid var(--gold);
}
.page-about .about-version:hover {
  background: var(--dome);
}
.page-about .about-version__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.page-about .about-version__code {
  margin-left: auto;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--gold-lit);
}
.page-about .about-version__title {
  margin: 0 0 12px;
  font-family: var(--font-h);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--mist);
}
.page-about .about-version__text {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--haze);
}
.page-about .about-version__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.page-about .about-version__list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 10px;
  padding-top: 10px;
  border-top: var(--about-line);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .about-version__key {
  padding-top: 3px;
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .about-version--v4 .about-version__key {
  color: var(--gold);
}
.page-about .about-versions__note {
  margin-top: clamp(20px, 3vw, 30px);
}

@media (min-width: 800px) {
  .page-about .about-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-version {
    padding: 30px 28px 34px;
  }
}

/* ---------- 发布节奏 ---------- */
.page-about .about-pace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 40px);
}
.page-about .about-pace__side {
  min-width: 0;
}
.page-about .about-pace__text {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--haze);
}
.page-about .about-pace__scale {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 3px;
  height: 48px;
  margin-top: 26px;
}
.page-about .about-pace__tick {
  background: linear-gradient(180deg, rgba(79, 227, 208, 0.85) 0%, rgba(79, 227, 208, 0.05) 100%);
}
.page-about .about-pace__tick:nth-child(n + 7) {
  background: linear-gradient(180deg, rgba(231, 178, 75, 0.9) 0%, rgba(231, 178, 75, 0.05) 100%);
}
.page-about .about-pace__note {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.page-about .about-channels {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: var(--about-line);
}
.page-about .about-channel {
  background: var(--ink);
  padding: 18px 18px 20px;
  min-width: 0;
}
.page-about .about-channel p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--haze);
}

@media (min-width: 640px) {
  .page-about .about-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 900px) {
  .page-about .about-pace {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 阶段时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin-top: clamp(26px, 4vw, 46px);
  padding-left: 28px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--cyan) 58%, rgba(28, 46, 72, 0) 100%);
}
.page-about .about-stage {
  position: relative;
  border-top: var(--about-line);
  padding: 18px 0 22px;
}
.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 26px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(231, 178, 75, 0.09);
}
.page-about .about-stage__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-stage__head::-webkit-details-marker {
  display: none;
}
.page-about .about-stage__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.page-about .about-stage__title {
  font-family: var(--font-h);
  font-size: clamp(16px, 2.4vw, 21px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--mist);
}
.page-about .about-stage__mark {
  width: 11px;
  height: 11px;
  border-right: 1px solid var(--haze);
  border-bottom: 1px solid var(--haze);
  transform: rotate(-135deg);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.page-about .about-stage[open] .about-stage__mark {
  transform: rotate(45deg);
  border-color: var(--gold);
}
.page-about .about-stage__body {
  padding-top: 14px;
}
.page-about .about-stage__body p {
  margin: 0 0 10px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--haze);
}
.page-about .about-stage__body p:last-child {
  margin-bottom: 0;
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 40px;
  }
  .page-about .about-timeline::before {
    left: 6px;
  }
  .page-about .about-stage {
    padding: 22px 0 26px;
  }
  .page-about .about-stage::before {
    left: -40px;
    top: 30px;
    width: 12px;
    height: 12px;
  }
}

/* ---------- 订阅 ---------- */
.page-about .about-sub {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  border-top: var(--about-line);
  padding-top: clamp(24px, 4vw, 40px);
}
.page-about .about-sub__text {
  min-width: 0;
}
.page-about .about-sub__text p {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--haze);
}
.page-about .about-sub__panel {
  min-width: 0;
  background: linear-gradient(150deg, var(--dome) 0%, var(--ink) 100%);
  border: var(--about-line);
  padding: 24px 20px 26px;
}
.page-about .about-sub__list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}
.page-about .about-sub__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-sub__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

/* ---------- 收束 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 16px;
}
.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-h);
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--mist);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--haze);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

@media (min-width: 900px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: clamp(24px, 5vw, 64px);
  }
  .page-about .about-cta__title,
  .page-about .about-cta__text {
    grid-column: 1;
  }
  .page-about .about-cta__actions {
    grid-column: 2;
    grid-row: 1 / span 2;
    margin-top: 0;
  }
}
<<<END>>>