.page-about {
  --about-line: var(--grid-700);
  --about-gap: clamp(46px, 7vw, 96px);
  --about-shadow: 0 20px 34px -26px rgba(0, 0, 0, .92);
  padding-bottom: clamp(56px, 8vw, 108px);
  overflow-x: hidden;
}

/* 阅读进度：纯 CSS 滚动驱动，无 JS 时不影响阅读 */
.page-about .read-meter {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  z-index: 40;
  background: rgba(28, 44, 73, .55);
  pointer-events: none;
}
.page-about .read-meter__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue-600), var(--purple-500) 58%, var(--cyan-400));
}
@supports (animation-timeline: scroll()) {
  .page-about .read-meter__bar {
    animation: about-read-progress 1ms linear both;
    animation-timeline: scroll(root block);
  }
}
@keyframes about-read-progress {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about .about-top {
  padding-top: clamp(18px, 3vw, 32px);
}

/* 首屏：非对称拼贴 */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
  margin-top: clamp(22px, 3.4vw, 40px);
  padding-bottom: clamp(34px, 5vw, 62px);
}
.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  font-size: var(--fs-display);
  font-weight: 900;
  letter-spacing: -.022em;
  line-height: 1.14;
}
.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: var(--lh-body);
  color: var(--text-100);
}
.page-about .about-lede--sub {
  margin-top: 14px;
  font-size: 15.5px;
  color: var(--text-400);
}
.page-about .about-hero__side {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  background:
    linear-gradient(180deg, rgba(47, 107, 255, .16), rgba(13, 23, 40, .9) 62%),
    var(--ink-850);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--blue-600);
}
.page-about .about-mark {
  writing-mode: vertical-rl;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--blue-300);
}
.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(143, 180, 255, .22);
}
.page-about .about-facts__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-facts dt {
  font-size: var(--fs-note);
  line-height: var(--lh-note);
  color: var(--text-400);
  letter-spacing: .04em;
}
.page-about .about-facts dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-100);
  text-align: right;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.6fr) minmax(248px, .72fr);
    align-items: start;
  }
  .page-about .about-hero__side {
    margin-top: 44px;
  }
}

/* 章节通用 */
.page-about .about-sec {
  margin-top: var(--about-gap);
}
.page-about .about-sec .shell > .section-head {
  margin-bottom: clamp(20px, 3vw, 34px);
}
.page-about .about-para {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: var(--lh-body);
  color: var(--text-100);
  max-width: 68ch;
}
.page-about .about-para--note {
  color: var(--text-400);
  font-size: 15.5px;
  padding-left: 14px;
  border-left: 2px solid rgba(47, 107, 255, .5);
}

/* 图形容器定位（共享 .figure 已提供框架） */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 34px) 0 clamp(26px, 3.6vw, 42px);
}
.page-about .about-figure--chains {
  margin-bottom: clamp(22px, 3.2vw, 36px);
}
.page-about .figure__frame img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  background: var(--ink-900);
}

/* 时间轴 */
.page-about .tl {
  list-style: none;
  margin: clamp(10px, 2vw, 18px) 0 0;
  padding: 0;
}
.page-about .tl__item {
  display: grid;
  gap: 12px;
  padding: clamp(22px, 3.2vw, 34px) 0;
  border-top: 1px solid var(--about-line);
}
.page-about .tl__year {
  position: relative;
  padding-left: 20px;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--blue-300);
}
.page-about .tl__year::before {
  content: "";
  position: absolute;
  left: 0;
  top: .34em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--blue-600);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, .2);
}
.page-about .tl__d > summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 12px;
  list-style: none;
  cursor: pointer;
}
.page-about .tl__d > summary::-webkit-details-marker {
  display: none;
}
.page-about .tl__d > summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-400);
  transition: color 160ms var(--ease);
}
.page-about .tl__d[open] > summary::after {
  content: "－";
  color: var(--cyan-400);
}
.page-about .tl__d > summary:hover::after {
  color: var(--blue-300);
}
.page-about .tl__title {
  margin: 0;
  font-size: clamp(19px, 2.1vw, 23px);
  font-weight: 800;
  letter-spacing: -.018em;
  line-height: 1.35;
}
.page-about .tl__d .prose {
  margin-top: 12px;
  max-width: 74ch;
}
.page-about .tl__d .prose p {
  margin: 0;
  font-size: 16px;
  line-height: var(--lh-body);
  color: var(--text-100);
}

@media (min-width: 860px) {
  .page-about .tl__item {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 46px);
    padding: clamp(26px, 3.4vw, 40px) 0;
  }
}

/* 编制与校对：窄图 + 宽文本 */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 3.6vw, 46px);
}
.page-about .about-split__fig {
  margin: 0;
}
.page-about .about-split__text {
  display: grid;
  gap: 20px;
}
.page-about .track-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .track-list__item {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--grid-700);
}
.page-about .track-list__item--guard {
  border-left-color: var(--amber-400);
}
.page-about .track-list__h {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.page-about .track-list__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: var(--lh-body);
  color: var(--text-400);
}
.page-about .about-note {
  position: relative;
  margin: 6px 0 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  background: var(--paper-100);
  color: var(--ink-950);
  border: 1px solid var(--ink-950);
  box-shadow: var(--about-shadow);
  transform: rotate(-.5deg);
}
.page-about .about-note__k {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: #4a5470;
}
.page-about .about-note p:last-child {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.4fr);
    align-items: start;
  }
  .page-about .about-split__fig {
    position: sticky;
    top: 118px;
  }
}

/* 链覆盖 */
.page-about .about-chains__intro {
  display: grid;
  gap: 4px;
}
.page-about .about-tbl .tbl {
  font-size: 14.5px;
}
.page-about .about-tbl td,
.page-about .about-tbl th {
  vertical-align: top;
  line-height: 1.68;
}
.page-about .about-tbl td.mono {
  color: var(--blue-300);
  white-space: nowrap;
  letter-spacing: .02em;
}
.page-about .about-tbl tbody th[scope="row"] {
  font-weight: 700;
  color: var(--text-100);
  white-space: nowrap;
}

/* 术语 */
.page-about .glossary {
  display: grid;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 28px);
}
.page-about .glossary__item {
  background: var(--ink-850);
  border: 1px solid var(--grid-700);
  border-left: 2px solid var(--grid-700);
  transition: border-color 160ms var(--ease);
}
.page-about .glossary__item[open] {
  border-left-color: var(--blue-600);
  border-color: var(--blue-600);
}
.page-about .glossary__item > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
}
.page-about .glossary__item > summary::-webkit-details-marker {
  display: none;
}
.page-about .glossary__item > summary:hover .glossary__term {
  color: var(--blue-300);
}
.page-about .glossary__k {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--text-400);
}
.page-about .glossary__term {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  transition: color 160ms var(--ease);
}
.page-about .glossary__d {
  margin: 0;
  padding: 0 16px 16px 46px;
  font-size: 15px;
  line-height: var(--lh-body);
  color: var(--text-400);
}
.page-about .about-rule {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px dashed rgba(143, 180, 255, .34);
  background: rgba(47, 107, 255, .06);
}
.page-about .about-rule__h {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--cyan-400);
}
.page-about .about-rule p:last-child {
  margin: 0;
  font-size: 15.5px;
  line-height: var(--lh-body);
  color: var(--text-100);
  max-width: 76ch;
}

@media (min-width: 780px) {
  .page-about .glossary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .glossary__item:first-child {
    grid-column: 1 / -1;
  }
}

/* 登记信息 */
.page-about .about-record {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
}
.page-about .about-record__panel {
  padding: clamp(20px, 3vw, 32px);
}
.page-about .about-record__k {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .18em;
  color: #4a5470;
}
.page-about .about-record__dl {
  margin: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-record__dl div {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(6, 11, 22, .14);
}
.page-about .about-record__dl div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-record__dl dt {
  font-size: 13px;
  letter-spacing: .06em;
  color: #5b6480;
}
.page-about .about-record__dl dd {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-950);
  line-height: 1.6;
}
.page-about .about-record__dl dd.mono {
  letter-spacing: .01em;
}
.page-about .about-record__note {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: var(--lh-body);
  color: #333c54;
}
.page-about .about-record__side {
  display: grid;
  gap: 12px;
  align-content: start;
}
.page-about .about-record__lead {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--text-400);
}
.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 1px solid var(--grid-700);
}
.page-about .about-links li {
  border-bottom: 1px solid var(--grid-700);
}
.page-about .about-links__a {
  display: block;
  padding: 13px 4px 13px 0;
  font-size: 15.5px;
  color: var(--text-100);
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}
.page-about .about-links__a:hover,
.page-about .about-links__a:focus-visible {
  color: var(--blue-300);
  padding-left: 8px;
}
.page-about .about-links__a::before {
  content: "→";
  margin-right: 10px;
  font-family: var(--font-mono);
  color: var(--blue-600);
}

@media (min-width: 900px) {
  .page-about .about-record {
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, .65fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .read-meter__bar {
    animation: none;
    transform: scaleX(1);
  }
  .page-about .about-note {
    transform: none;
  }
  .page-about .about-links__a,
  .page-about .glossary__term,
  .page-about .tl__d > summary::after,
  .page-about .glossary__item {
    transition: none;
  }
}
<<<END>>>