.page-about {
  --about-rail: 280px;
  --about-gap: clamp(20px, 3vw, 44px);
  --about-pad: clamp(20px, 4vw, 36px);
  background:
    radial-gradient(120% 70% at 85% 0%, rgba(59, 242, 208, .08), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--paper);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .breadcrumbs {
  padding-block: 20px 6px;
  font-size: .8125rem;
}

/* ---------- Hero：左叙事 / 右索引 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-block: clamp(14px, 3vw, 30px) clamp(28px, 5vw, 56px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 6vw, 4rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 12px 0 0;
  color: var(--paper);
}

.page-about .about-hero__lede {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.7vw, 1.125rem);
  line-height: 1.9;
  color: var(--paper);
  max-width: 34em;
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-figure {
  margin: 28px 0 0;
}

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

.page-about .about-figure--hero img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 索引导航卡 */
.page-about .about-index {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 53, 42, .55);
  backdrop-filter: blur(8px);
}

.page-about .about-index__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0 0 0 15px;
  border-left: 1px solid var(--line);
}

.page-about .about-index__item {
  position: relative;
}

.page-about .about-index__item::before {
  content: "";
  position: absolute;
  left: -18.5px;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line);
  transition: background .25s var(--ease);
}

.page-about .about-index__item:hover::before,
.page-about .about-index__item:focus-within::before {
  background: var(--orange);
}

.page-about .about-index__link {
  display: flex;
  gap: 10px;
  padding: 9px 0;
  color: var(--muted);
  text-decoration: none;
  font-size: .9375rem;
  line-height: 1.5;
  transition: color .2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  color: var(--cyan);
  padding-top: 3px;
  transition: color .2s var(--ease);
}

.page-about .about-index__link:hover .about-index__no {
  color: var(--orange);
}

.page-about .about-index__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-index__fact dt {
  font-size: .75rem;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .about-index__fact dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--cyan-soft);
}

/* ---------- 全宽数据带 ---------- */
.page-about .about-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(59, 242, 208, .07), rgba(255, 122, 26, .05));
  padding-block: 18px;
  margin-block: 4px clamp(30px, 5vw, 60px);
}

.page-about .about-band__strip {
  display: flex;
  gap: clamp(18px, 4vw, 56px);
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-band__strip .data-strip__item {
  flex: 0 0 auto;
  min-width: 118px;
}

.page-about .about-band__strip .data-strip__label {
  display: block;
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-band__strip .data-strip__value {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-band__strip .data-strip__item--accent .data-strip__value {
  color: var(--orange);
}

/* ---------- 章节：左旁注 / 右正文 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: var(--about-gap);
  padding-block: clamp(30px, 5vw, 54px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--top-h) + 24px);
}

.page-about .about-chapter__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  opacity: .32;
  transition: opacity .3s var(--ease), color .3s var(--ease);
}

.page-about .about-chapter__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  transition: color .3s var(--ease);
}

.page-about .about-chapter__note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-family: var(--font-serif);
  font-size: .875rem;
  line-height: 1.85;
  color: var(--muted);
  transition: border-color .3s var(--ease), color .3s var(--ease);
}

.page-about .about-chapter:target .about-chapter__no {
  opacity: 1;
  color: var(--orange);
}

.page-about .about-chapter:target .about-chapter__title {
  color: var(--cyan-soft);
}

.page-about .about-chapter:target .about-chapter__note {
  border-left-color: var(--orange);
  color: var(--cyan-soft);
}

.page-about .about-chapter__body {
  max-width: 42em;
}

.page-about .about-chapter__body > p {
  margin: 0 0 18px;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--paper);
}

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

/* 三时段 */
.page-about .about-slots {
  display: grid;
  gap: 14px;
  margin: 6px 0 24px;
}

.page-about .about-slot {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(18, 53, 42, .5);
  transition: background .25s var(--ease);
}

.page-about .about-slot:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .about-slot__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-slot:nth-child(3) .about-slot__time {
  color: var(--orange);
}

.page-about .about-slot__title {
  margin: 9px 0 10px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-slot__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* 版本对照 */
.page-about .about-versions {
  display: grid;
  gap: 16px;
  margin: 6px 0 26px;
}

.page-about .about-version {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 53, 42, .45);
}

.page-about .about-version--current {
  border-color: rgba(255, 122, 26, .55);
  background: linear-gradient(160deg, rgba(255, 122, 26, .12), rgba(18, 53, 42, .68));
}

.page-about .about-version__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 4px 11px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .1em;
  background: rgba(59, 242, 208, .14);
  color: var(--cyan-soft);
}

.page-about .about-version--current .about-version__tag {
  background: rgba(255, 122, 26, .18);
  color: var(--orange);
}

.page-about .about-version__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-version__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-version__list li {
  position: relative;
  padding-left: 18px;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-version__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-version--current .about-version__list li {
  color: var(--paper);
}

.page-about .about-version--current .about-version__list li::before {
  background: var(--orange);
}

/* 合作四类 */
.page-about .about-partners {
  margin: 6px 0 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__row {
  display: grid;
  gap: 5px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__row dt {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--cyan-soft);
}

.page-about .about-partners__row dd {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 60px);
}

.page-about .about-cta__inner {
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(59, 242, 208, .14), transparent 55%),
    rgba(18, 53, 42, .6);
  backdrop-filter: blur(8px);
}

.page-about .about-cta__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  line-height: 1.15;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 宽屏 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--top-h) + 24px);
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-chapter__aside {
    position: sticky;
    top: calc(var(--top-h) + 32px);
    align-self: start;
  }
}

@media (min-width: 720px) {
  .page-about .about-slots {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-versions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners__row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

@media (max-width: 719px) {
  .page-about .about-hero__lede {
    padding-left: 12px;
    border-left-width: 2px;
  }

  .page-about .about-band__strip {
    gap: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__item::before,
  .page-about .about-index__link,
  .page-about .about-index__no,
  .page-about .about-chapter__no,
  .page-about .about-chapter__title,
  .page-about .about-chapter__note,
  .page-about .about-slot {
    transition: none;
  }
}
<<<END>>>