.page-about {
  --ab-line: 2px solid var(--ink-deep);
  --ab-gap: clamp(32px, 5vw, 64px);
  --ab-bg-grid: repeating-linear-gradient(
    90deg,
    rgba(10, 34, 51, 0.045) 0 1px,
    transparent 1px 96px
  );
  background-color: var(--ice);
  background-image: var(--ab-bg-grid);
  color: var(--ink-deep);
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about a {
  color: inherit;
}

.page-about a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 刊头 ---------- */
.page-about .about-hero {
  background: var(--ice);
  border-bottom: var(--ab-line);
  padding: clamp(26px, 5vw, 52px) 0 clamp(30px, 5vw, 56px);
  text-align: center;
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .about-hero__crumb {
  justify-content: center;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--orange);
  letter-spacing: 0.16em;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(36px, 7.4vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: clamp(14px, 2vw, 22px) 0 0;
  max-width: 20ch;
}

.page-about .about-hero__deck {
  max-width: 58ch;
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--slate);
  text-align: left;
}

/* ---------- 通栏主图 ---------- */
.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  border-bottom: var(--ab-line);
  background: var(--ink-deep);
  overflow: hidden;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: clamp(200px, 40vw, 440px);
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-hero-figure__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 40px clamp(18px, 4vw, 40px) 14px;
  background: linear-gradient(to top, rgba(5, 20, 29, 0.9), rgba(5, 20, 29, 0));
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ice);
}

/* ---------- 主栅格 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  padding-top: clamp(34px, 6vw, 68px);
}

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

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  margin-bottom: clamp(44px, 7vw, 92px);
  scroll-margin-top: 120px;
}

.page-about .about-chapter:last-of-type {
  margin-bottom: clamp(36px, 5vw, 56px);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  border-top: var(--ab-line);
  padding-top: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .chapter-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .chapter-num {
  color: var(--orange);
  font-weight: 700;
}

.page-about .chapter-year {
  color: var(--fog);
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.005em;
  margin: 0;
}

.page-about .chapter-body > p {
  margin: 0 0 1.1em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-slate);
  max-width: 66ch;
}

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

.page-about .chapter-body a {
  color: var(--ink-deep);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .chapter-body a:hover {
  color: var(--orange);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin: clamp(22px, 3vw, 34px) 0 clamp(26px, 4vw, 40px);
  border-top: 2px solid var(--ice-line);
  padding-top: 0;
  position: relative;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-timeline__node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 10px 12px 0;
  text-decoration: none;
  min-width: 0;
}

.page-about .ab-timeline__dot {
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--ink-deep);
  background: var(--ice);
  transition: background-color var(--speed) ease, border-color var(--speed) ease;
}

.page-about .ab-timeline__node--now .ab-timeline__dot {
  background: var(--orange);
  border-color: var(--char);
}

.page-about .ab-timeline__node:hover .ab-timeline__dot,
.page-about .ab-timeline__node:focus-visible .ab-timeline__dot {
  background: var(--orange);
}

.page-about .ab-timeline__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--ink-deep);
}

.page-about .ab-timeline__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--fog);
  letter-spacing: 0.02em;
}

/* ---------- 演进阶段 ---------- */
.page-about .ab-phases {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-left: 2px solid var(--ice-line);
  margin-left: 4px;
}

.page-about .ab-phase {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) clamp(18px, 3vw, 26px);
  scroll-margin-top: 130px;
}

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

.page-about .ab-phase::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  border: 2px solid var(--ink-deep);
}

.page-about .ab-phase__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .ab-phase__title {
  margin: 4px 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-deep);
}

.page-about .ab-phase__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 60ch;
}

/* ---------- 双栏图文 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 34px);
}

.page-about .ab-split__media,
.page-about .ab-split__text {
  min-width: 0;
}

.page-about .ab-figure {
  margin: 0;
  border: var(--ab-line);
  background: var(--ink-deep);
  overflow: hidden;
  box-shadow: var(--shadow-hard);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .ab-figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .ab-figure__cap {
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--ice);
  background: var(--ink-deep);
}

/* ---------- 团队构成 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0;
}

.page-about .ab-team__item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 14px;
  align-items: baseline;
  border: var(--ab-line);
  border-left: 6px solid var(--cyan);
  background: var(--ice);
  padding: 12px 14px;
}

.page-about .ab-team__num {
  grid-row: span 2;
  font-size: 30px;
  line-height: 1;
  font-weight: 500;
  color: var(--ink-deep);
}

.page-about .ab-team__role {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-deep);
}

.page-about .ab-team__desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 使用者列表 ---------- */
.page-about .ab-audience {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-audience__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-top: 2px solid var(--ice-line);
}

.page-about .ab-audience__item:last-child {
  border-bottom: 2px solid var(--ice-line);
}

.page-about .ab-audience__idx {
  font-size: 13px;
  color: var(--orange);
  letter-spacing: 0.08em;
  padding-top: 3px;
}

.page-about .ab-audience__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-deep);
}

.page-about .ab-audience__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 62ch;
}

.page-about .ab-inline-link {
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 62ch;
}

/* ---------- 引言与原则 ---------- */
.page-about .ab-quote {
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: clamp(18px, 3vw, 24px) clamp(18px, 3vw, 26px);
  border: 2px solid var(--char);
  background: var(--ice-line);
  box-shadow: var(--shadow-soft);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.55;
  color: var(--ink-deep);
}

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

.page-about .ab-rules__item {
  padding: 16px 0;
  border-bottom: 2px solid var(--ice-line);
}

.page-about .ab-rules__item:first-child {
  border-top: 2px solid var(--ice-line);
}

.page-about .ab-rules__title {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-deep);
  padding-left: 12px;
  border-left: 2px solid var(--orange);
}

.page-about .ab-rules__item p {
  margin: 0;
  padding-left: 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 60ch;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  border: var(--ab-line);
  background: var(--ink-deep);
  color: var(--ice);
  padding: clamp(20px, 3.4vw, 30px);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-next__title {
  margin: 0 0 clamp(14px, 2.4vw, 20px);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
  color: var(--ice);
}

.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-next__link {
  display: block;
  border: 2px solid var(--ice-line);
  border-left: 6px solid var(--orange);
  padding: 12px 14px;
  text-decoration: none;
  transition: transform var(--speed) ease, border-color var(--speed) ease;
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  transform: translateX(3px);
  border-color: var(--orange);
}

.page-about .ab-next__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 4px;
}

.page-about .ab-next__text {
  display: block;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ice);
}

/* ---------- 侧栏 ---------- */
.page-about .about-aside {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .about-aside__card {
  border: var(--ab-line);
  background: var(--ice);
  padding: 16px;
  box-shadow: var(--shadow-soft);
}

.page-about .about-aside__card--dark {
  background: var(--ink-slate);
  color: var(--ice);
  border-color: var(--char);
}

.page-about .about-aside__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .about-aside__label--light {
  color: var(--cyan);
}

.page-about .about-toc {
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: block;
  padding: 7px 10px;
  font-size: 13.5px;
  line-height: 1.55;
  text-decoration: none;
  color: var(--ink-slate);
  border-left: 2px solid var(--ice-line);
  transition: background-color var(--speed) ease, border-color var(--speed) ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--ice-line);
  border-left-color: var(--orange);
  color: var(--ink-deep);
}

.page-about .ab-stats {
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid rgba(226, 234, 240, 0.18);
  padding-bottom: 6px;
}

.page-about .ab-stats__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-stats__key {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ice-line);
}

.page-about .ab-stats__val {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-team__item {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 4px;
  }

  .page-about .ab-team__num {
    grid-row: auto;
    font-size: 34px;
  }

  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__deck {
    text-align: center;
  }

  .page-about .chapter-head {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .chapter-meta {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-split--flip .ab-split__media {
    order: 2;
  }

  .page-about .about-chapter--wide {
    max-width: 100%;
  }

  .page-about .about-chapter--mid {
    max-width: 94%;
  }

  .page-about .about-chapter--narrow {
    max-width: 80%;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 268px;
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 116px;
  }

  .page-about .about-chapter--narrow {
    max-width: 74%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__link,
  .page-about .ab-timeline__dot,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .ab-next__link:hover,
  .page-about .ab-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>