.page-about {
  --ab-body: rgba(234, 246, 216, 0.76);
  --ab-soft: rgba(143, 167, 155, 0.95);
  --ab-cut: 30px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding-top: clamp(18px, 3vw, 30px);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
}
.page-about .breadcrumbs__item {
  color: var(--muted);
}
.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 9px;
  color: var(--hair-strong);
}
.page-about .breadcrumbs__item a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .breadcrumbs__item a:hover,
.page-about .breadcrumbs__item a:focus-visible {
  color: var(--kiwi-flesh);
  border-bottom-color: var(--kiwi);
}
.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--kiwi-flesh);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
}
.page-about .ab-hero__inner {
  display: grid;
  gap: 16px;
  padding: clamp(26px, 5vw, 56px) 0 clamp(22px, 3.5vw, 34px);
}
.page-about .ab-hero__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(30px, 6.2vw, 54px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.012em;
  color: var(--flesh);
}
.page-about .ab-hero__lead {
  margin: 0;
  max-width: 38em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--ab-body);
}
.page-about .ab-hero__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 6px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--hair);
}
.page-about .ab-hero__strip li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--ab-soft);
}
.page-about .ab-hero__strip .num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--kiwi-flesh);
}

.page-about .ab-cover {
  position: relative;
  margin: 0;
  overflow: hidden;
}
.page-about .ab-cover img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.94);
}
.page-about .ab-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 42, 30, 0.12) 0%, rgba(14, 42, 30, 0.55) 60%, rgba(14, 42, 30, 0.95) 100%);
  pointer-events: none;
}
.page-about .ab-cover__cap {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 16px;
  z-index: 2;
  margin: 0;
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--flesh);
  opacity: 0.82;
}

/* ---------- 立场声明 ---------- */
.page-about .ab-stance {
  padding-block: clamp(52px, 9vw, 108px);
}
.page-about .ab-stance__title {
  margin: 18px 0 0;
  max-width: 24ch;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 200;
  line-height: 1.35;
  letter-spacing: -0.006em;
  color: var(--flesh);
}
.page-about .ab-stance__title::after {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  margin-top: 28px;
  background: linear-gradient(90deg, var(--kiwi) 0%, var(--kiwi-flesh) 100%);
}
.page-about .ab-stance__note {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: var(--fs-15);
  line-height: 1.9;
  color: var(--ab-soft);
}

/* ---------- 沿革时间轴 ---------- */
.page-about .ab-history__lead,
.page-about .ab-lines__lead,
.page-about .ab-scope__lead {
  margin: 0;
  max-width: 30em;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--ab-soft);
}
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
  position: relative;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--kiwi) 0%, var(--kiwi-mid) 38%, rgba(123, 191, 58, 0.14) 100%);
}
.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 clamp(32px, 5vw, 54px) 32px;
}
.page-about .ab-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .ab-tl__node {
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--ink-000);
  border: 2px solid var(--kiwi);
  clip-path: polygon(0 0, 100% 0, 100% 60%, 60% 100%, 0 100%);
}
.page-about .ab-tl__item--current .ab-tl__node {
  background: var(--kiwi);
  border-color: var(--kiwi-flesh);
}
.page-about .ab-tl__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  letter-spacing: 0.12em;
  color: var(--kiwi-flesh);
}
.page-about .ab-tl__name {
  margin: 0 0 10px;
  font-size: var(--fs-20);
  font-weight: 600;
  line-height: 1.4;
  color: var(--flesh);
}
.page-about .ab-tl__text {
  margin: 0;
  max-width: 46em;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--ab-body);
}
.page-about .ab-tl__more {
  margin-top: 14px;
}
.page-about .ab-tl__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  padding-bottom: 2px;
  font-size: var(--fs-13);
  letter-spacing: 0.12em;
  color: var(--kiwi-mid);
  border-bottom: 1px solid var(--hair-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-tl__more summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-tl__more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  line-height: 1;
}
.page-about .ab-tl__more[open] summary::after {
  content: "–";
}
.page-about .ab-tl__more summary:hover {
  color: var(--kiwi-flesh);
  border-bottom-color: var(--kiwi);
}
.page-about .ab-tl__more summary:focus-visible {
  outline: 1px solid var(--kiwi);
  outline-offset: 3px;
}
.page-about .ab-tl__more p {
  margin: 14px 0 0;
  max-width: 44em;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--ab-soft);
  border-left: 1px solid var(--hair-strong);
  padding-left: 16px;
}

/* ---------- 四条主线 ---------- */
.page-about .ab-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .ab-line {
  position: relative;
  padding: clamp(20px, 2.8vw, 30px);
  background: var(--ink-200);
  box-shadow: inset 0 0 0 1px var(--hair);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .ab-line::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: var(--ab-cut);
  height: var(--ab-cut);
  background: var(--ink-000);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}
.page-about .ab-line:hover {
  box-shadow: inset 0 0 0 1px var(--hair-strong);
  transform: translateY(-2px);
}
.page-about .ab-line__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.16em;
  color: var(--kiwi);
}
.page-about .ab-line__title {
  margin: 10px 0 12px;
  font-size: var(--fs-20);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--flesh);
}
.page-about .ab-line__text {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.85;
  color: var(--ab-body);
}
.page-about .ab-line__why {
  margin: 14px 0 0;
  padding-top: 14px;
  font-size: var(--fs-13);
  line-height: 1.8;
  color: var(--ab-soft);
  border-top: 1px dashed var(--hair-mute);
}
.page-about .ab-line__link {
  display: inline-block;
  margin-top: 16px;
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--kiwi-flesh);
  text-decoration: none;
  border-bottom: 1px solid var(--hair-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-line__link:hover,
.page-about .ab-line__link:focus-visible {
  color: var(--kiwi-mid);
  border-bottom-color: var(--kiwi-mid);
}

/* ---------- 编辑与班次 ---------- */
.page-about .ab-desk__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.page-about .ab-desk__copy h2 {
  margin: 14px 0 16px;
}
.page-about .ab-desk__copy p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: var(--fs-15);
  line-height: 1.9;
  color: var(--ab-body);
}
.page-about .ab-desk__figure {
  margin: 0;
}
.page-about .ab-desk__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-left: 3px solid var(--kiwi);
}
.page-about .ab-desk__figure .figure__caption {
  margin-top: 10px;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--ab-soft);
}

.page-about .ab-shifts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(28px, 5vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
}
.page-about .ab-shift {
  padding: 18px 20px;
  background: var(--ink-100);
  transition: background-color var(--dur) var(--ease);
}
.page-about .ab-shift:hover,
.page-about .ab-shift:focus-visible {
  background: var(--ink-200);
  outline: none;
}
.page-about .ab-shift:focus-visible {
  box-shadow: inset 0 0 0 1px var(--kiwi);
}
.page-about .ab-shift__name {
  margin: 0 0 6px;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--flesh);
}
.page-about .ab-shift__time {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  letter-spacing: 0.06em;
  color: var(--kiwi-flesh);
}
.page-about .ab-shift__scope {
  margin: 0;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--ab-soft);
  opacity: 0.55;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .ab-shift:hover .ab-shift__scope,
.page-about .ab-shift:focus-within .ab-shift__scope,
.page-about .ab-shift:focus .ab-shift__scope {
  opacity: 1;
  color: var(--kiwi-mid);
}
.page-about .ab-shifts__hint {
  margin: 14px 0 0;
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--ab-soft);
  opacity: 0.72;
}

/* ---------- 稳定版策略 ---------- */
.page-about .ab-stable__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}
.page-about .ab-stable__figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.page-about .ab-stable__figure img {
  display: block;
  width: min(100%, 320px);
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid var(--hair-strong);
}
.page-about .ab-stable__figure figcaption {
  margin-top: 14px;
  max-width: 26ch;
  text-align: center;
  font-size: var(--fs-13);
  line-height: 1.7;
  color: var(--ab-soft);
}
.page-about .ab-stable__copy h2 {
  margin: 14px 0 16px;
}
.page-about .ab-stable__copy > p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: var(--fs-15);
  line-height: 1.9;
  color: var(--ab-body);
}
.page-about .ab-stable__list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}
.page-about .ab-stable__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: var(--ab-body);
  border-bottom: 1px dashed var(--hair-mute);
}
.page-about .ab-stable__list span {
  flex: 0 0 auto;
  font-size: var(--fs-13);
  letter-spacing: 0.12em;
  color: var(--kiwi);
}
.page-about .ab-stable__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

/* ---------- 口径与边界 ---------- */
.page-about .ab-scope__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .ab-scope__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-scope__list li {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  font-size: var(--fs-15);
  line-height: 1.8;
  color: var(--ab-body);
  border-bottom: 1px solid var(--hair-mute);
}
.page-about .ab-scope__k {
  flex: 0 0 auto;
  min-width: 3.6em;
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--kiwi-flesh);
}
.page-about .ab-scope__list--drop .ab-scope__k {
  color: var(--muted);
}
.page-about .ab-scope__list--drop li {
  color: var(--ab-soft);
}

.page-about .ab-scope__fold {
  margin-top: clamp(28px, 4vw, 42px);
}
.page-about .fold__toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  font-family: inherit;
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--kiwi-mid);
  background: none;
  border: 1px solid var(--hair-strong);
  border-radius: var(--pill);
  cursor: pointer;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .fold__toggle:hover {
  color: var(--ink-000);
  background: var(--kiwi);
  border-color: var(--kiwi);
}
.page-about .fold__toggle:focus-visible {
  outline: 1px solid var(--kiwi);
  outline-offset: 3px;
}
.page-about .fold__mark {
  font-family: var(--font-mono);
  font-size: var(--fs-15);
  line-height: 1;
}
.page-about .fold__mark::before {
  content: "+";
}
.page-about .fold__toggle[aria-expanded="true"] .fold__mark::before {
  content: "–";
}
.page-about .fold__body {
  margin-top: 18px;
  max-width: 46em;
}
.page-about .fold__body p {
  margin: 0 0 12px;
  font-size: var(--fs-15);
  line-height: 1.9;
  color: var(--ab-body);
}
.page-about .fold__body a {
  color: var(--kiwi-flesh);
  border-bottom: 1px solid var(--hair-strong);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .fold__body a:hover {
  color: var(--kiwi-mid);
  border-bottom-color: var(--kiwi-mid);
}
.page-about .ab-scope__anchor {
  margin: clamp(28px, 4vw, 40px) 0 0;
  max-width: 44em;
  padding-left: 18px;
  border-left: 2px solid var(--signal);
  font-size: var(--fs-15);
  line-height: 1.9;
  color: var(--ab-body);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-shifts {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .ab-scope__cols {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .ab-scope__list--drop {
    margin-top: clamp(24px, 4vw, 56px);
  }
}

@media (min-width: 900px) {
  .page-about .ab-lines {
    grid-template-columns: repeat(12, 1fr);
  }
  .page-about .ab-line--a { grid-column: span 7; }
  .page-about .ab-line--b { grid-column: span 5; }
  .page-about .ab-line--c { grid-column: span 5; }
  .page-about .ab-line--d { grid-column: span 7; }

  .page-about .ab-desk__top {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
  .page-about .ab-shifts {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .ab-stable__grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  }
  .page-about .ab-stable__figure {
    margin-top: clamp(0px, 3vw, 36px);
  }
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}
<<<END>>>