.page-about {
  --ab-rail-w: minmax(0, 3fr);
  --ab-body-w: minmax(0, 8fr);
  --ab-sticky-top: 92px;
  color: var(--ar-fog);
  font-family: var(--ar-font-sans);
  line-height: 1.75;
  background:
    radial-gradient(1100px 560px at 12% -8%, rgba(198, 161, 91, 0.11), transparent 62%),
    radial-gradient(900px 520px at 92% 34%, rgba(42, 74, 103, 0.28), transparent 66%),
    linear-gradient(180deg, var(--ar-ink-900) 0%, var(--ar-ink-800) 34%, var(--ar-ink-900) 100%);
  overflow-x: hidden;
}

.page-about .ab-crumbrow {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(34px, 5.5vw, 68px);
  border-bottom: 1px solid var(--ar-line-soft);
}

.page-about .ab-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: end;
}

.page-about .ab-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--ar-font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.24;
  letter-spacing: 0.02em;
  color: var(--ar-fog);
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 44em;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.8;
  color: rgba(245, 242, 234, 0.84);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-summary {
  position: relative;
  padding: 22px 22px 18px;
  border: 1px solid var(--ar-line);
  border-radius: var(--ar-radius);
  background: var(--ar-glass);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.page-about .ab-summary::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(198, 161, 91, 0.16);
  pointer-events: none;
}

.page-about .ab-summary__title {
  margin: 0 0 14px;
  font-family: var(--ar-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ar-gold-200);
}

.page-about .ab-summary__list {
  margin: 0;
  padding: 0;
}

.page-about .ab-summary__row {
  display: grid;
  grid-template-columns: 6.6em minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--ar-line-soft);
}

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

.page-about .ab-summary__row dt {
  font-family: var(--ar-font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ar-gold-500);
}

.page-about .ab-summary__row dd {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ar-celadon);
}

.page-about .ab-summary__jump {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--ar-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ar-gold-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 161, 91, 0.45);
  padding-bottom: 2px;
}

.page-about .ab-summary__jump:hover,
.page-about .ab-summary__jump:focus-visible {
  color: var(--ar-fog);
  border-bottom-color: var(--ar-vermillion);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  padding: clamp(38px, 6vw, 76px) 0;
  border-bottom: 1px solid var(--ar-line-soft);
}

.page-about .ab-chapter__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 38px);
}

.page-about .ab-chapter__no {
  display: block;
  font-family: var(--ar-font-mono);
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--ar-gold-500);
  opacity: 0.55;
}

.page-about .ab-chapter__title {
  margin: 10px 0 0;
  font-family: var(--ar-font-serif);
  font-weight: 600;
  font-size: clamp(21px, 2.5vw, 27px);
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: var(--ar-fog);
}

.page-about .ab-chapter__meta {
  margin: 12px 0 0;
  font-family: var(--ar-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ar-celadon);
}

.page-about .ab-chapter__body {
  min-width: 0;
}

.page-about .ab-chapter__body p {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(245, 242, 234, 0.82);
}

.page-about .ab-chapter__lede {
  margin-top: 0 !important;
  font-family: var(--ar-font-serif);
  font-size: clamp(17px, 1.9vw, 20px) !important;
  line-height: 1.7 !important;
  color: var(--ar-gold-200) !important;
}

.page-about .ab-inline-link {
  color: var(--ar-gold-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 161, 91, 0.5);
  padding-bottom: 2px;
  transition: color 0.18s var(--ar-ease), border-color 0.18s var(--ar-ease);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--ar-fog);
  border-bottom-color: var(--ar-vermillion);
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--ar-gold-500);
  outline-offset: 3px;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 26px 0 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--ar-line-soft);
  background: var(--ar-ink-700);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-family: var(--ar-font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--ar-celadon);
}

/* ---------- 引文 ---------- */
.page-about .ab-quote {
  margin: 26px 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--ar-sand);
  background: rgba(216, 198, 166, 0.1);
  font-family: var(--ar-font-serif);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ar-gold-200);
}

/* ---------- 五类收录清单 ---------- */
.page-about .ab-ledger {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--ar-line-soft);
}

.page-about .ab-ledger li {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: 0 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--ar-line-soft);
}

.page-about .ab-ledger__no {
  font-family: var(--ar-font-mono);
  font-size: 14px;
  line-height: 1.9;
  color: var(--ar-vermillion);
  letter-spacing: 0.06em;
}

.page-about .ab-ledger h3 {
  margin: 0;
  font-family: var(--ar-font-serif);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--ar-fog);
}

.page-about .ab-ledger p {
  margin: 6px 0 0 !important;
  font-size: 14.5px !important;
  line-height: 1.75 !important;
  color: rgba(245, 242, 234, 0.72) !important;
}

/* ---------- 旁注折叠 ---------- */
.page-about .ab-aside {
  margin-top: 24px;
  border: 1px solid var(--ar-line-soft);
  border-left: 2px solid var(--ar-gold-500);
  background: rgba(42, 74, 103, 0.18);
  padding: 4px 18px 8px;
}

.page-about .ab-aside summary {
  cursor: pointer;
  padding: 12px 0;
  list-style: none;
  font-family: var(--ar-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.7;
  color: var(--ar-gold-200);
}

.page-about .ab-aside summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-aside summary::before {
  content: "＋";
  margin-right: 8px;
  color: var(--ar-gold-500);
  font-family: var(--ar-font-mono);
}

.page-about .ab-aside[open] summary::before {
  content: "－";
}

.page-about .ab-aside p {
  margin: 0 0 12px !important;
  font-size: 14px !important;
  line-height: 1.8 !important;
  color: var(--ar-celadon) !important;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
  margin-top: 22px;
}

.page-about .ab-ring {
  display: block;
  width: 100%;
  max-width: 280px;
  height: auto;
  margin: 0 auto;
}

.page-about .ab-ring__seg {
  transition: stroke-width 0.2s var(--ar-ease), opacity 0.2s var(--ar-ease);
  cursor: default;
}

.page-about .ab-ring__seg:hover,
.page-about .ab-ring__seg:focus-visible {
  stroke-width: 21;
}

.page-about .ab-ring__center {
  font-family: var(--ar-font-mono);
  font-size: 26px;
  font-weight: 600;
  fill: var(--ar-fog);
}

.page-about .ab-ring__cap {
  font-family: var(--ar-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  fill: var(--ar-celadon);
}

.page-about .ab-team__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ar-line-soft);
}

.page-about .ab-team__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px 6px;
  border-bottom: 1px solid var(--ar-line-soft);
  transition: background-color 0.18s var(--ar-ease);
}

.page-about .ab-team__item:hover,
.page-about .ab-team__item:focus-visible {
  background: rgba(198, 161, 91, 0.08);
}

.page-about .ab-team__dot {
  width: 10px;
  height: 10px;
  border-radius: 1px;
}

.page-about .ab-team__dot--a { background: #C6A15B; }
.page-about .ab-team__dot--b { background: #D8C6A6; }
.page-about .ab-team__dot--c { background: #91A6AE; }
.page-about .ab-team__dot--d { background: #B54736; }

.page-about .ab-team__name {
  font-size: 14.5px;
  line-height: 1.6;
  color: rgba(245, 242, 234, 0.84);
}

.page-about .ab-team__count {
  font-family: var(--ar-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ar-gold-500);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.18s var(--ar-ease), transform 0.18s var(--ar-ease);
}

.page-about .ab-team__item:hover .ab-team__count,
.page-about .ab-team__item:focus-visible .ab-team__count,
.page-about .ab-team__item:focus-within .ab-team__count {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .ab-timeline li {
  position: relative;
  margin-left: 5px;
  padding: 0 0 26px 22px;
  border-left: 1px solid var(--ar-line-soft);
}

.page-about .ab-timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.62em;
  width: 9px;
  height: 9px;
  background: var(--ar-gold-500);
}

.page-about .ab-timeline li:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-timeline li:last-child::before {
  background: var(--ar-vermillion);
}

.page-about .ab-timeline h3 {
  margin: 0;
  font-family: var(--ar-font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ar-gold-200);
}

.page-about .ab-timeline p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(245, 242, 234, 0.78);
}

.page-about .ab-chapter--timeline {
  border-bottom: 0;
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  padding: clamp(34px, 5.5vw, 68px) 0 clamp(46px, 7vw, 88px);
}

.page-about .ab-cta__box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: clamp(22px, 3.6vw, 42px);
  border: 1px solid var(--ar-line);
  background:
    linear-gradient(135deg, rgba(42, 74, 103, 0.34), rgba(7, 17, 28, 0.18));
}

.page-about .ab-cta__title {
  margin: 0;
  font-family: var(--ar-font-serif);
  font-weight: 600;
  font-size: clamp(21px, 2.6vw, 28px);
  letter-spacing: 0.02em;
  color: var(--ar-fog);
}

.page-about .ab-cta__text p {
  margin: 12px 0 0;
  max-width: 46em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(245, 242, 234, 0.78);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 滚动淡入 ---------- */
.ar-js .page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s var(--ar-ease), transform 0.45s var(--ar-ease);
}

.ar-js .page-about [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .ar-js .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .ab-team__count,
  .page-about .ab-ring__seg {
    transition: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
    gap: 28px;
  }
  .page-about .ab-ring {
    margin: 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .ab-chapter__inner {
    grid-template-columns: var(--ab-rail-w) var(--ab-body-w);
    gap: clamp(28px, 4.2vw, 64px);
  }

  .page-about .ab-chapter__rail {
    position: sticky;
    top: var(--ab-sticky-top);
    align-self: start;
  }

  .page-about .ab-chapter__body p {
    max-width: 60ch;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 230px) minmax(0, 1fr);
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .ab-figure img {
    max-height: 460px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-chapter__body p {
    max-width: 64ch;
  }
}
<<<END>>>