.page-about {
  --about-rail-w: 96px;
  --about-stem: clamp(20px, 3vw, 32px);
  display: block;
  background:
    radial-gradient(120% 70% at 88% -6%, rgba(53, 242, 192, 0.09), transparent 62%),
    var(--ink-abyss);
  color: var(--paper);
  font-family: var(--font-cjk);
}

/* ---------- 通用文字层级 ---------- */
.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--volt-dim);
}

.page-about .lead {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.8vw, 44px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: clamp(430px, 78vh, 740px);
  padding: calc(var(--header-h) + clamp(52px, 10vw, 110px)) 0 clamp(72px, 11vw, 140px);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
}

.page-about .about-hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-about .about-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(158deg, rgba(6, 18, 31, 0.5) 0%, rgba(6, 18, 31, 0.9) 58%, var(--ink-abyss) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(44px, 8vw, 108px);
  background: var(--ink-abyss);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-dim);
}

.page-about .breadcrumb a {
  color: var(--paper-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  max-width: 17ch;
  font-size: clamp(30px, 6.4vw, 70px);
  font-weight: 900;
  line-height: 1.07;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: 54ch;
  font-size: clamp(15px, 1.7vw, 18px);
  color: var(--paper-dim);
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--paper-dim);
}

.page-about .about-hero-facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
}

.page-about .about-hero-facts .num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

/* ---------- 时间线网格 ---------- */
.page-about .about-timeline {
  background: radial-gradient(58% 38% at 6% 0%, rgba(53, 242, 192, 0.06), transparent 72%);
}

.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-rail .rail-list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail .rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .rail-item a {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  white-space: nowrap;
  text-decoration: none;
  font-size: 12px;
  color: var(--paper-dim);
  border-bottom: 2px solid var(--line-hair);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail .rail-item a:hover,
.page-about .about-rail .rail-item a:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-about .about-rail .num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* ---------- 阶段 ---------- */
.page-about .about-stages {
  display: grid;
  gap: 0;
  min-width: 0;
}

.page-about .about-stage {
  position: relative;
  padding: 0 0 clamp(32px, 4.6vw, 52px) var(--about-stem);
  border-left: 1px solid var(--line-hair);
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--volt-dim);
  background: var(--ink-abyss);
}

.page-about .about-stage--milestone::before {
  border-color: var(--volt);
  background: var(--volt);
  box-shadow: 0 0 0 4px rgba(53, 242, 192, 0.16);
}

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

.page-about .about-stage-num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--volt-dim);
}

.page-about .about-stage h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.7vw, 31px);
  font-weight: 700;
  line-height: 1.26;
}

.page-about .about-stage-sum {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-stage--milestone .about-stage-head {
  padding: clamp(18px, 3vw, 30px);
  background: var(--volt);
  border-radius: var(--radius);
  color: var(--ink-abyss);
}

.page-about .about-stage--milestone .about-stage-head h2 {
  color: var(--ink-abyss);
}

.page-about .about-stage--milestone .about-stage-num {
  color: rgba(6, 18, 31, 0.66);
}

.page-about .about-stage--milestone .about-stage-sum {
  color: rgba(6, 18, 31, 0.82);
}

.page-about .about-stage-more {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-hair);
}

.page-about .about-stage-more summary {
  display: inline-block;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--volt-dim);
  transition: color var(--dur) var(--ease);
}

.page-about .about-stage-more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-stage-more summary::before {
  content: "+ ";
}

.page-about .about-stage-more[open] summary::before {
  content: "− ";
}

.page-about .about-stage-more summary:hover,
.page-about .about-stage-more summary:focus-visible {
  color: var(--volt);
}

.page-about .about-stage-more p {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-dim);
}

/* ---------- 编辑室 ---------- */
.page-about .about-studio-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.page-about .about-roster {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .roster-row {
  display: grid;
  grid-template-columns: 5.8em minmax(0, 1fr) 2.6em;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--paper-dim);
}

.page-about .roster-bar {
  display: block;
  height: 6px;
  border-radius: 999px;
  background: rgba(244, 239, 230, 0.1);
  overflow: hidden;
}

.page-about .roster-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--volt-dim), var(--volt));
}

.page-about .roster-fill--edit { width: 46.2%; }
.page-about .roster-fill--proof { width: 30.8%; }
.page-about .roster-fill--product { width: 23.1%; }

.page-about .roster-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  text-align: right;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-studio-note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--coral);
  background: var(--ink-glass);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-studio-figure {
  margin: 0;
}

.page-about .about-studio-figure .media-frame {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .about-studio-figure .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--paper-dim);
}

/* ---------- 栏目演进 ---------- */
.page-about .about-line-list {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-hair);
}

.page-about .about-line-list > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(18px, 2.8vw, 30px) 0;
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-line-list p.line-idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--volt-dim);
}

.page-about .about-line-list h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-line-list > li > p:not(.line-idx) {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-dim);
}

/* ---------- 读者 ---------- */
.page-about .about-reader-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(26px, 3.6vw, 40px);
}

.page-about .reader-card {
  padding: clamp(20px, 3.2vw, 34px);
  border: 1px solid var(--line-hair);
  border-radius: var(--radius);
  background: var(--ink-deep);
}

.page-about .reader-card--oversea {
  border-color: rgba(53, 242, 192, 0.3);
  background: linear-gradient(180deg, rgba(53, 242, 192, 0.08), rgba(12, 31, 51, 0.92));
}

.page-about .reader-zone {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.16em;
  color: var(--volt);
}

.page-about .reader-card h3 {
  margin: 0 0 12px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .reader-card p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-readers-note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  max-width: 66ch;
  padding-left: 18px;
  border-left: 2px solid var(--volt-dim);
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-dim);
}

/* ---------- 版本注释 ---------- */
.page-about .about-version-figure {
  margin: 0 0 clamp(28px, 4vw, 46px);
}

.page-about .about-version-figure .media-frame {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .about-version-figure .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  object-fit: cover;
}

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

.page-about .version-item {
  display: grid;
  grid-template-columns: 4.4em minmax(0, 1fr);
  gap: clamp(14px, 2.6vw, 34px);
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--line-hair);
  transition: padding-left var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .version-item:hover,
.page-about .version-item:focus-within {
  padding-left: 12px;
  background: rgba(53, 242, 192, 0.055);
}

.page-about .version-tag {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 27px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.page-about .version-body h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .version-body p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper-dim);
}

/* ---------- 继续翻阅 ---------- */
.page-about .about-next {
  padding: clamp(34px, 5.4vw, 62px) 0;
  border-top: 1px solid var(--line-hair);
  background: var(--ink-deep);
}

.page-about .about-next-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-next-list a {
  display: block;
  padding: 15px 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-next-list a::after {
  content: " →";
  color: var(--volt-dim);
}

.page-about .about-next-list a:hover,
.page-about .about-next-list a:focus-visible {
  color: var(--volt);
}

.page-about .about-next-list a span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 400;
  color: var(--paper-dim);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-reader-pair {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .about-next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(16px, 3vw, 34px);
  }

  .page-about .about-line-list > li {
    grid-template-columns: 4.4em minmax(0, 12em) minmax(0, 1fr);
    align-items: baseline;
    gap: clamp(16px, 3vw, 40px);
  }
}

/* ---------- 桌面：左栏年代刻度吸附 ---------- */
@media (min-width: 900px) {
  .page-about .about-timeline-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
  }

  .page-about .about-rail .rail-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail .rail-item a {
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    padding: 9px 0 9px 12px;
    border-bottom: 0;
    border-left: 2px solid var(--line-hair);
    font-size: 12px;
  }

  .page-about .about-rail .rail-item a:hover,
  .page-about .about-rail .rail-item a:focus-visible {
    border-left-color: var(--volt);
    border-bottom-color: transparent;
  }

  .page-about .about-studio-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
  }

  .page-about .about-next-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero h1 {
    max-width: 20ch;
  }
}

/* ---------- 降低动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .version-item,
  .page-about .about-stage-more summary,
  .page-about .about-next-list a,
  .page-about .breadcrumb a,
  .page-about .about-rail .rail-item a {
    transition: none;
  }

  .page-about .version-item:hover,
  .page-about .version-item:focus-within {
    padding-left: 0;
  }
}
<<<END>>>