.page-about {
  --about-panel: rgba(26, 16, 53, .78);
  --about-edge: rgba(123, 59, 255, .42);
  --about-edge-cyan: rgba(34, 224, 255, .66);
  --about-ink-soft: rgba(244, 241, 255, .74);
  padding-bottom: 0;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 海报首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(26px, 5vw, 56px) clamp(34px, 6vw, 72px);
  border-bottom: 2px solid var(--about-edge);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(123, 59, 255, .36), transparent 62%),
    radial-gradient(80% 70% at 90% 16%, rgba(34, 224, 255, .15), transparent 60%),
    linear-gradient(180deg, var(--indigo) 0%, var(--void) 100%);
}

.page-about .about-hero .poster__kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--magenta);
}

.page-about .about-hero .poster__title {
  margin: 0 0 18px;
  max-width: 18ch;
  font-family: var(--font-poster);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -.012em;
  color: var(--offwhite);
  text-shadow: 0 0 30px rgba(123, 59, 255, .55);
}

.page-about .about-hero .poster__title em {
  font-style: normal;
  color: var(--cyan);
  text-shadow: 0 0 24px rgba(34, 224, 255, .62);
}

.page-about .about-hero .poster__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 3px solid var(--violet);
}

.page-about .about-hero__num {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  text-shadow: 0 0 16px rgba(34, 224, 255, .45);
}

.page-about .about-hero__cap {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-hero .lightband {
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 22px;
  height: 3px;
  background: linear-gradient(90deg, transparent, rgba(123, 59, 255, .9), rgba(34, 224, 255, .9), transparent);
  opacity: .5;
}

@media (min-width: 760px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  padding-block: clamp(24px, 5vw, 56px) clamp(8px, 2vw, 20px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-chapters {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */

.page-about .chapter-index {
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 2px solid var(--about-edge);
}

.page-about .chapter-index__head {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .chapter-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .chapter-index__cell {
  min-width: 0;
}

.page-about .chapter-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  font-size: 12.5px;
  color: var(--offwhite);
  text-decoration: none;
  border: 1px solid var(--about-edge);
  background: rgba(11, 6, 32, .5);
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .chapter-index__num {
  font-size: 11px;
  color: var(--magenta);
}

.page-about .chapter-index__link:hover,
.page-about .chapter-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--about-edge-cyan);
  background: rgba(34, 224, 255, .08);
}

/* ---------- 章节通用 ---------- */

.page-about .chapter {
  position: relative;
  margin-bottom: clamp(26px, 4vw, 46px);
  padding: clamp(20px, 4vw, 40px);
  border: 2px solid var(--about-edge);
  background: linear-gradient(165deg, var(--about-panel), rgba(11, 6, 32, .7));
  scroll-margin-top: 92px;
}

.page-about .chapter::before {
  content: "";
  position: absolute;
  top: 8px;
  right: 8px;
  width: 42px;
  height: 5px;
  background: var(--cyan);
  opacity: .8;
}

.page-about .chapter:target {
  border-color: var(--about-edge-cyan);
  box-shadow: 0 0 0 1px rgba(34, 224, 255, .2), 0 0 34px rgba(34, 224, 255, .16);
}

.page-about .chapter__head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.page-about .chapter__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8vw, 66px);
  line-height: .9;
  color: var(--violet);
  background: linear-gradient(140deg, var(--violet) 8%, var(--cyan) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.2;
  color: var(--offwhite);
}

.page-about .chapter__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 44ch;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.68;
  color: var(--mist);
}

.page-about .chapter__tail {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--about-edge);
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 媒体框 ---------- */

.page-about .media-frame {
  margin: 0 0 26px;
  border: 2px solid var(--about-edge);
  background: rgba(5, 3, 15, .7);
}

.page-about .media-frame__inner {
  overflow: hidden;
}

.page-about .media-frame__inner img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-frame__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--about-edge);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 26px;
}

.page-about .about-chart__dots circle {
  fill: var(--cyan);
}

.page-about .about-chart__dots circle:nth-child(even) {
  fill: var(--violet);
}

.page-about .lineage-list {
  list-style: none;
  margin: 0 0 0 8px;
  padding: 0;
  border-left: 2px solid var(--about-edge);
}

.page-about .lineage-item {
  position: relative;
  padding: 0 0 24px 22px;
}

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

.page-about .lineage-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--cyan);
  background: var(--void);
  transform: rotate(45deg);
}

.page-about .lineage-item__stage {
  display: inline-block;
  margin-bottom: 5px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--magenta);
}

.page-about .lineage-item__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--offwhite);
}

.page-about .lineage-item__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.76;
  color: var(--about-ink-soft);
}

/* ---------- 内容体系 ---------- */

.page-about .library-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-bottom: 26px;
}

.page-about .library-ring {
  text-align: center;
}

.page-about .about-ring {
  display: block;
  width: min(230px, 100%);
  height: auto;
  margin-inline: auto;
  filter: drop-shadow(0 0 20px rgba(123, 59, 255, .42));
}

.page-about .about-ring__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  fill: var(--offwhite);
}

.page-about .about-ring__label {
  font-family: var(--font-body);
  font-size: 13px;
  fill: var(--mist);
}

.page-about .library-ring__cap {
  margin: 14px 0 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cat-item {
  position: relative;
  padding: 14px 16px 14px 22px;
  border: 2px solid var(--about-edge);
  background: rgba(11, 6, 32, .6);
  transition: transform .18s ease, border-color .18s ease;
}

.page-about .cat-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--cat, var(--violet));
}

.page-about .cat-item:nth-child(1) { --cat: #7B3BFF; }
.page-about .cat-item:nth-child(2) { --cat: #22E0FF; }
.page-about .cat-item:nth-child(3) { --cat: #FF2E9A; }
.page-about .cat-item:nth-child(4) { --cat: #C9B7FF; }
.page-about .cat-item:nth-child(5) { --cat: #FFE44D; }
.page-about .cat-item:nth-child(6) { --cat: #6B5FA8; }

.page-about .cat-item:hover,
.page-about .cat-item:focus-within {
  transform: translateX(4px);
  border-color: var(--cat, var(--violet));
}

.page-about .cat-item__name {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 600;
  color: var(--offwhite);
}

.page-about .cat-item__idx {
  margin-right: 8px;
  font-size: 12.5px;
  color: var(--cat, var(--mist));
}

.page-about .cat-item__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

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

@media (min-width: 880px) {
  .page-about .library-split {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .cat-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 更新节奏 ---------- */

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.page-about .rhythm-card {
  padding: 20px 18px;
  border: 2px solid var(--about-edge);
  border-top: 5px solid var(--violet);
  background: rgba(11, 6, 32, .62);
}

.page-about .rhythm-card:nth-child(2) { border-top-color: var(--cyan); }
.page-about .rhythm-card:nth-child(3) { border-top-color: var(--magenta); }

.page-about .rhythm-card__cycle {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
}

.page-about .rhythm-card__num {
  display: block;
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--yellow);
}

.page-about .rhythm-card__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--offwhite);
}

.page-about .rhythm-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--about-ink-soft);
}

.page-about .rhythm-archive {
  padding: 18px 20px;
  border-left: 4px solid var(--cyan);
  background: linear-gradient(90deg, rgba(34, 224, 255, .12), rgba(34, 224, 255, 0) 72%);
}

.page-about .rhythm-archive__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  color: var(--offwhite);
}

.page-about .rhythm-archive p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

@media (min-width: 760px) {
  .page-about .rhythm-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队与协作 ---------- */

.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .team-block {
  padding: 20px 18px;
  border: 2px solid var(--about-edge);
  background: rgba(26, 16, 53, .6);
}

.page-about .team-block:last-child {
  border-color: rgba(255, 46, 154, .42);
}

.page-about .team-block__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  color: var(--cyan);
}

.page-about .team-block:last-child .team-block__title {
  color: var(--magenta);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--about-ink-soft);
}

.page-about .team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 2px;
  background: var(--magenta);
}

.page-about .team-list strong {
  font-weight: 600;
  color: var(--offwhite);
}

@media (min-width: 900px) {
  .page-about .team-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px;
    align-items: start;
  }
  .page-about .team-block:last-child {
    transform: translateY(24px);
  }
}

/* ---------- 覆盖与响应 ---------- */

.page-about .coverage-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .coverage-stat {
  padding: 18px 16px;
  border: 2px solid var(--about-edge);
  background:
    linear-gradient(180deg, rgba(123, 59, 255, .24), rgba(123, 59, 255, 0) 78%),
    rgba(11, 6, 32, .6);
}

.page-about .coverage-stat__num {
  display: block;
  font-size: clamp(22px, 5.4vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .coverage-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .coverage-note {
  padding: 20px;
  border: 2px dashed var(--about-edge);
}

.page-about .coverage-note h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  color: var(--offwhite);
}

.page-about .coverage-note p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .coverage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

/* ---------- 页尾跳转 ---------- */

.page-about .about-outro {
  padding-block: clamp(34px, 6vw, 72px);
  border-top: 2px solid var(--about-edge);
  background: linear-gradient(180deg, rgba(11, 6, 32, 0), var(--void) 72%);
}

.page-about .about-outro__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 900;
  color: var(--offwhite);
}

.page-about .about-outro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-link {
  display: block;
  padding: 18px 16px;
  border: 2px solid var(--about-edge);
  background: rgba(26, 16, 53, .62);
  color: inherit;
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  transform: translateY(-4px);
  border-color: var(--about-edge-cyan);
  box-shadow: 0 0 26px rgba(34, 224, 255, .2);
}

.page-about .about-link__label {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--magenta);
}

.page-about .about-link__title {
  display: block;
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.32;
  color: var(--offwhite);
}

.page-about .about-link__text {
  display: block;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

@media (min-width: 800px) {
  .page-about .about-outro__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面布局 ---------- */

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 186px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 62px);
    align-items: start;
  }
  .page-about .chapter-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }
  .page-about .chapter-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 6px;
  }
  .page-about .chapter-index__link {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid transparent;
    border-left: 3px solid var(--about-edge);
    background: transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cat-item,
  .page-about .about-link,
  .page-about .chapter-index__link {
    transition: none;
  }
  .page-about .cat-item:hover,
  .page-about .about-link:hover {
    transform: none;
  }
  .page-about .team-block:last-child {
    transform: none;
  }
}
<<<END>>>