.page-about {
  --ab-num-size: clamp(2.6rem, 8vw, 5rem);
  --ab-ink-soft: rgba(245, 241, 230, 0.82);
  --ab-ink-faint: rgba(245, 241, 230, 0.62);
}

/* ---------- 顶部面包屑条 ---------- */
.page-about .ab-topbar {
  background: var(--paper);
  padding: 1.25rem 0 0.25rem;
}

/* ---------- 框景首屏 ---------- */
.page-about .ab-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-green);
  color: var(--paper);
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.5rem, 7vw, 5rem);
}

.page-about .ab-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(195, 203, 199, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(195, 203, 199, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .ab-frame__box {
  position: relative;
  background: rgba(11, 42, 34, 0.55);
  border: 1px solid rgba(195, 203, 199, 0.24);
  padding: clamp(1.5rem, 4.5vw, 3.5rem);
}

.page-about .ab-frame__box::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(46, 158, 99, 0.28);
  pointer-events: none;
}

.page-about .ab-frame__corner {
  position: absolute;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--silver);
  opacity: 0.7;
  z-index: 1;
}

.page-about .ab-frame__corner--tl {
  top: 1.1rem;
  left: clamp(1.1rem, 4.5vw, 3rem);
}

.page-about .ab-frame__corner--br {
  right: clamp(1.1rem, 4.5vw, 3rem);
  bottom: -0.1rem;
}

.page-about .ab-frame__kicker {
  margin: 0 0 1rem;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--turf);
}

.page-about .ab-frame__title {
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 5.6vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 18em;
}

.page-about .ab-frame__lead {
  margin: 0;
  max-width: 640px;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-frame__stats {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  padding-top: 1.35rem;
  border-top: 1px solid rgba(195, 203, 199, 0.22);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 1rem 1.25rem;
}

.page-about .ab-frame__stats .ht-anchor__unit {
  color: var(--silver);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .ab-chapter {
  position: relative;
  background: var(--paper);
  color: var(--black);
  padding: clamp(2.75rem, 7vw, 5.5rem) 0;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.page-about .ab-chapter--dark {
  background: var(--ink-green);
  color: var(--paper);
}

.page-about .ab-chapter--indigo {
  background: var(--indigo);
  color: var(--paper);
}

.page-about .ab-chapter--slant {
  padding-top: calc(clamp(2.75rem, 7vw, 5.5rem) + 2.5rem);
  clip-path: polygon(0 2.5rem, 100% 0, 100% 100%, 0 100%);
}

.page-about .ab-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.1rem, 3.5vw, 2.5rem);
}

.page-about .ab-chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.page-about .ab-chapter__no {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: var(--ab-num-size);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(18, 16, 14, 0.3);
}

.page-about .ab-chapter--dark .ab-chapter__no,
.page-about .ab-chapter--indigo .ab-chapter__no {
  -webkit-text-stroke-color: rgba(195, 203, 199, 0.52);
}

.page-about .ab-chapter__label {
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--turf);
}

.page-about .ab-chapter__title {
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  font-family: var(--font-display);
  font-weight: 750;
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: -0.01em;
}

.page-about .ab-text {
  margin: 0 0 1.1rem;
  max-width: 660px;
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .ab-chapter--dark .ab-text,
.page-about .ab-chapter--indigo .ab-text {
  color: var(--ab-ink-soft);
}

.page-about .ab-note {
  margin: 1.1rem 0 0;
  max-width: 660px;
  font-size: 0.8rem;
  line-height: 1.8;
  letter-spacing: 0.04em;
  color: rgba(18, 16, 14, 0.62);
  padding-left: 0.85rem;
  border-left: 2px solid var(--turf);
}

.page-about .ab-note--on-dark {
  color: var(--ab-ink-faint);
}

.page-about .ab-note a,
.page-about .ab-split__text a,
.page-about .ab-text a,
.page-about .ab-region__desc a,
.page-about .ab-roster__desc a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--turf);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .ab-note a:hover,
.page-about .ab-split__text a:hover,
.page-about .ab-text a:hover,
.page-about .ab-region__desc a:hover,
.page-about .ab-roster__desc a:hover {
  color: var(--turf);
  border-color: var(--ref-yellow);
}

/* ---------- 图文分栏 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
  align-items: start;
}

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

.page-about .ab-figure .ht-figure__media {
  overflow: hidden;
  border-radius: var(--radius-card);
  background: var(--ink-green-2);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure .ht-figure__caption {
  margin-top: 0.6rem;
  font-size: 0.74rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: rgba(18, 16, 14, 0.6);
}

.page-about .ab-chapter--dark .ab-figure .ht-figure__caption,
.page-about .ab-chapter--indigo .ab-figure .ht-figure__caption {
  color: var(--ab-ink-faint);
}

/* ---------- 字段清单 ---------- */
.page-about .ab-fields {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
}

.page-about .ab-field {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.3rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .ab-chapter--dark .ab-field,
.page-about .ab-chapter--indigo .ab-field {
  border-bottom-color: var(--line-dark);
}

.page-about .ab-field__key {
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--ink-green-2);
}

.page-about .ab-chapter--dark .ab-field__key,
.page-about .ab-chapter--indigo .ab-field__key {
  color: var(--turf);
}

.page-about .ab-field__val {
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(18, 16, 14, 0.82);
}

.page-about .ab-chapter--dark .ab-field__val,
.page-about .ab-chapter--indigo .ab-field__val {
  color: var(--ab-ink-soft);
}

/* ---------- 复核流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.page-about .ab-flow__item {
  position: relative;
}

.page-about .ab-flow__dot {
  display: inline-block;
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: var(--turf);
  margin-bottom: 0.7rem;
}

.page-about .ab-flow__dot--final {
  background: var(--ref-yellow);
}

.page-about .ab-flow__step {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--ink-green-2);
  margin-bottom: 0.35rem;
}

.page-about .ab-flow__name {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.page-about .ab-flow__desc {
  margin: 0 0 0.9rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(18, 16, 14, 0.78);
  border-top: 1px solid var(--line-light);
  padding-top: 0.75rem;
}

/* ---------- 可展开明细 ---------- */
.page-about .ab-details {
  border-top: 1px dashed var(--line-light);
}

.page-about .ab-details .ht-details__summary {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--ink-green-2);
  transition: color var(--t-fast);
}

.page-about .ab-details .ht-details__summary:hover {
  color: var(--turf);
}

.page-about .ab-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.page-about .ab-checklist li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.88rem;
  line-height: 1.72;
}

.page-about .ab-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 1px;
  background: var(--turf);
}

/* ---------- 归档时序带 ---------- */
.page-about .ab-timeline {
  margin-top: 1.8rem;
}

.page-about .ab-timeline__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.page-about .ab-season {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  padding: 0.8rem 0.95rem 0.95rem;
  background: rgba(245, 241, 230, 0.07);
  border-top: 3px solid var(--turf);
  min-width: 0;
  transition: background var(--t-fast), border-color var(--t-fast);
}

.page-about .ab-season:hover {
  background: rgba(245, 241, 230, 0.14);
  border-top-color: var(--ref-yellow);
}

.page-about .ab-season__year {
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--ref-yellow);
}

.page-about .ab-season__depth {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--silver);
  white-space: nowrap;
}

/* ---------- 团队编制 ---------- */
.page-about .ab-roster {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-light);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.page-about .ab-roster__item {
  background: var(--paper);
  padding: 1.1rem 0 1.2rem;
}

.page-about .ab-roster__num {
  display: block;
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-green-2);
  margin-bottom: 0.6rem;
}

.page-about .ab-roster__role {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
}

.page-about .ab-roster__desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(18, 16, 14, 0.78);
}

.page-about .ab-shift {
  margin-top: 2rem;
  padding: 1.1rem 1.2rem 1.3rem;
  background: rgba(20, 80, 60, 0.07);
  border-left: 3px solid var(--turf);
}

.page-about .ab-shift__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.page-about .ab-shift__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .ab-shift__list li {
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(18, 16, 14, 0.8);
}

.page-about .ab-shift__time {
  display: inline-block;
  min-width: 7.2rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-green-2);
}

/* ---------- 专区与服务 ---------- */
.page-about .ab-region {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .ab-region__panel {
  border-radius: var(--radius-card);
  padding: 1.2rem 1.25rem 1.4rem;
}

.page-about .ab-region__panel--solid {
  background: rgba(245, 241, 230, 0.06);
  border: 1px solid rgba(195, 203, 199, 0.22);
}

.page-about .ab-region__panel .ht-tag {
  margin-bottom: 0.75rem;
  display: inline-block;
}

.page-about .ab-region__name {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-region__desc {
  margin: 0 0 0.7rem;
  font-size: 0.92rem;
  line-height: 1.83;
  color: var(--ab-ink-soft);
}

.page-about .ab-region__desc:last-child {
  margin-bottom: 0;
}

/* ---------- 修订记录 ---------- */
.page-about .ab-versions {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .ab-version {
  border-bottom: 1px solid var(--line-light);
}

.page-about .ab-version--current {
  background: rgba(122, 46, 58, 0.05);
}

.page-about .ab-version .ab-details {
  border-top: 0;
}

.page-about .ab-version .ht-details__summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.9rem 0;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--black);
}

.page-about .ab-version__label {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.page-about .ab-version--current .ab-version__label {
  color: var(--wine);
  font-weight: 700;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-field {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }

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

  .page-about .ab-roster__item {
    padding: 1.2rem 1.25rem 1.4rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-chapter__grid {
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
  }

  .page-about .ab-chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
  }

  .page-about .ab-chapter__label {
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) 340px;
  }

  .page-about .ab-split--reverse {
    grid-template-columns: 320px minmax(0, 1fr);
  }

  .page-about .ab-split--reverse .ab-split__text {
    order: 2;
  }

  .page-about .ab-figure--portrait .ht-figure__media img {
    aspect-ratio: 4 / 3;
    height: 100%;
    object-fit: cover;
  }

  .page-about .ab-figure--square .ht-figure__media img {
    aspect-ratio: 1 / 1;
    object-fit: cover;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2rem;
    position: relative;
  }

  .page-about .ab-flow::before {
    content: "";
    position: absolute;
    top: 0.45rem;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--turf);
    opacity: 0.42;
  }

  .page-about .ab-flow__item {
    padding-top: 2.1rem;
  }

  .page-about .ab-flow__dot {
    position: absolute;
    top: 0;
    left: 0;
    margin: 0;
    box-shadow: 0 0 0 6px var(--paper);
  }

  .page-about .ab-timeline__row {
    display: flex;
    align-items: stretch;
    gap: 0.5rem;
  }

  .page-about .ab-season {
    flex: 1 1 0;
  }

  .page-about .ab-season--w1 { flex-grow: 0.68; }
  .page-about .ab-season--w2 { flex-grow: 0.78; }
  .page-about .ab-season--w3 { flex-grow: 0.9; }
  .page-about .ab-season--w4 { flex-grow: 1; }
  .page-about .ab-season--w5 { flex-grow: 1.15; }

  .page-about .ab-region {
    grid-template-columns: 6fr 5fr;
    gap: 1.25rem;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-frame__title {
    max-width: 16em;
  }

  .page-about .ab-split--reverse {
    grid-template-columns: 380px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-season,
  .page-about .ab-details .ht-details__summary,
  .page-about .ab-note a,
  .page-about .ab-text a {
    transition: none;
  }
}