.page-about {
  --ab-rail: 188px;
  --ab-cut: 18px;
  --ab-mono: var(--font-mono);
  background: var(--paper);
  color: var(--char);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--header-h) + 56px) 0 64px;
  color: var(--paper);
  background:
    radial-gradient(circle at 82% 12%, rgba(156, 255, 87, .17), transparent 46%),
    radial-gradient(circle at 8% 92%, rgba(255, 179, 71, .10), transparent 40%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 66%, #07221b 100%);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -140px;
  height: 240px;
  background: linear-gradient(90deg, rgba(156, 255, 87, .16), rgba(11, 59, 53, 0));
  transform: rotate(-3deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .ab-crumbs ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  font-size: 12px;
  font-family: var(--ab-mono);
  letter-spacing: .04em;
  color: rgba(243, 247, 242, .55);
}

.page-about .ab-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(243, 247, 242, .35);
}

.page-about .ab-crumbs a {
  color: var(--grass-soft);
  text-decoration: none;
}

.page-about .ab-crumbs a:hover {
  color: var(--grass);
}

.page-about .ab-hero .eyebrow {
  color: var(--grass);
  font-family: var(--ab-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin: 0 0 16px;
}

.page-about .ab-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(32px, 7.6vw, 68px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.02em;
  max-width: 15em;
}

.page-about .ab-hero .lede {
  margin: 0 0 30px;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(243, 247, 242, .82);
  max-width: 34em;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
}

.page-about .ab-badge {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line-dark);
  background: rgba(243, 247, 242, .04);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
  transition: border-color .28s var(--ease), background .28s var(--ease);
}

.page-about .ab-badge:hover,
.page-about .ab-badge:focus-within {
  border-color: var(--grass);
  background: rgba(156, 255, 87, .08);
}

.page-about .ab-badge__num {
  font-family: var(--ab-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--grass);
  line-height: 1;
}

.page-about .ab-badge__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(243, 247, 242, .68);
}

.page-about .ab-badge__pop {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 6;
  width: max-content;
  max-width: 220px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--char);
  background: var(--paper);
  border-left: 3px solid var(--amber);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__visual {
  position: relative;
  margin: 0;
}

.page-about .ab-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(.72) brightness(.86) contrast(1.06);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
}

.page-about .ab-hero__label {
  position: absolute;
  left: 14px;
  bottom: 14px;
  background: var(--ink);
  color: var(--grass-soft);
  border: 1px solid rgba(156, 255, 87, .45);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  padding: 40px 0 8px;
}

.page-about .ab-body__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .ab-index__kicker {
  margin: 0 0 10px;
  font-family: var(--ab-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(16, 35, 30, .5);
}

.page-about .ab-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-index__list li {
  flex: 0 0 auto;
}

.page-about .ab-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--char);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(243, 247, 242, .8);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: transform .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .ab-index__list a .num {
  font-family: var(--ab-mono);
  font-size: 11px;
  color: rgba(16, 35, 30, .45);
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--grass);
  color: var(--ink);
}

.page-about .ab-index__list a:hover .num {
  color: var(--ink-2);
}

/* ---------- 章节 ---------- */
.page-about .ab-chapter {
  padding: 44px 0 8px;
  border-top: 1px solid var(--line);
}

.page-about .ab-chapter:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .ab-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .ab-chapter__no {
  font-family: var(--ab-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink-2);
  padding: 3px 8px;
  border: 1px solid var(--line);
  background: rgba(156, 255, 87, .18);
}

.page-about .ab-chapter__title {
  margin: 0;
  font-size: clamp(23px, 5vw, 34px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -.015em;
}

.page-about .ab-chapter__content p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16, 35, 30, .84);
}

.page-about .ab-chapter__content strong {
  color: var(--ink);
  font-weight: 800;
  background: linear-gradient(180deg, transparent 62%, rgba(156, 255, 87, .55) 62%);
}

.page-about .ab-chapter__lead {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16, 35, 30, .72);
}

.page-about .ab-inline-link {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-2);
  text-decoration: none;
}

.page-about .ab-inline-link--light {
  color: var(--grass-soft);
}

.page-about .ab-chapter__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 设计理念 ---------- */
.page-about .ab-chapter__split {
  display: grid;
  gap: 26px;
}

.page-about .ab-palette {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .ab-palette__item {
  display: grid;
  grid-template-columns: 26px 1fr;
  grid-template-areas:
    "chip name"
    "chip desc";
  align-items: center;
  column-gap: 10px;
  padding: 10px 12px;
  background: rgba(167, 180, 193, .14);
  border-left: 3px solid transparent;
}

.page-about .ab-palette__chip {
  grid-area: chip;
  width: 26px;
  height: 26px;
  display: block;
}

.page-about .ab-palette__item b {
  grid-area: name;
  font-size: 13px;
  font-weight: 800;
}

.page-about .ab-palette__item span:last-child {
  grid-area: desc;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(16, 35, 30, .62);
}

.page-about .ab-palette__item--ink { border-left-color: var(--ink); }
.page-about .ab-palette__item--ink .ab-palette__chip { background: var(--ink); }
.page-about .ab-palette__item--grass { border-left-color: var(--grass); }
.page-about .ab-palette__item--grass .ab-palette__chip { background: var(--grass); }
.page-about .ab-palette__item--amber { border-left-color: var(--amber); }
.page-about .ab-palette__item--amber .ab-palette__chip { background: var(--amber); }
.page-about .ab-palette__item--steel { border-left-color: var(--steel); }
.page-about .ab-palette__item--steel .ab-palette__chip { background: var(--steel); }

.page-about .ab-design__figure {
  position: relative;
  margin: 0;
}

.page-about .ab-design__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.8) brightness(.92);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .ab-design__figure figcaption {
  position: absolute;
  right: 12px;
  bottom: 12px;
  background: var(--paper);
  color: var(--ink-2);
  border: 1px solid var(--line);
}

/* ---------- 面板 ---------- */
.page-about .ab-panel {
  padding: 26px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}

.page-about .ab-panel--ink {
  color: var(--paper);
  background: linear-gradient(168deg, var(--ink) 0%, var(--ink-2) 100%);
}

.page-about .ab-panel--wine {
  color: var(--paper);
  background: linear-gradient(168deg, #4a2233 0%, var(--wine) 100%);
}

.page-about .ab-panel__note {
  margin: 6px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-dark);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(243, 247, 242, .72);
}

.page-about .ab-panel__note .num {
  font-family: var(--ab-mono);
  color: var(--amber);
  font-weight: 700;
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--grass), rgba(156, 255, 87, .12));
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 26px 34px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--grass);
  background: var(--ink);
  transition: transform .26s var(--ease), background .26s var(--ease);
}

.page-about .ab-tl__item:hover::before {
  transform: scale(1.3);
  background: var(--grass);
}

.page-about .ab-tl__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--ab-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--grass);
}

.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(243, 247, 242, .72);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-team__main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(243, 247, 242, .84);
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-team__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border-left: 2px solid var(--grass);
  background: rgba(243, 247, 242, .06);
}

.page-about .ab-team__stats .num {
  font-family: var(--ab-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--grass-soft);
  line-height: 1;
}

.page-about .ab-team__stats small {
  font-size: 12px;
  color: rgba(243, 247, 242, .66);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 24px;
  margin-bottom: 26px;
}

.page-about .ab-split__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16, 35, 30, .84);
}

.page-about .ab-split__figure {
  position: relative;
  margin: 0;
}

.page-about .ab-split__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.68) brightness(.82) contrast(1.05);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .ab-split__figure figcaption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  background: var(--indigo);
  color: #d9d2ee;
  border: 1px solid rgba(217, 210, 238, .4);
}

.page-about .ab-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-reach__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background: var(--paper);
}

.page-about .ab-reach__stats .num {
  font-family: var(--ab-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--indigo);
  line-height: 1;
}

.page-about .ab-reach__stats small {
  font-size: 12px;
  line-height: 1.5;
  color: rgba(16, 35, 30, .6);
}

/* ---------- 信任 ---------- */
.page-about .ab-honor {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  margin-top: 6px;
  border-left: 4px solid var(--amber);
  background: rgba(255, 179, 71, .12);
}

.page-about .ab-honor .exhibit-label {
  background: var(--amber);
  color: var(--ink);
  border: 0;
  flex: 0 0 auto;
}

.page-about .ab-honor p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 更新说明 ---------- */
.page-about .ab-changes__list {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-changes__list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(16, 35, 30, .74);
  background: rgba(167, 180, 193, .18);
}

.page-about .ab-changes__list .num {
  font-family: var(--ab-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--ink-2);
}

/* ---------- 结尾 CTA ---------- */
.page-about .ab-cta {
  margin-top: 56px;
  padding: 52px 0 60px;
  color: var(--paper);
  background:
    radial-gradient(circle at 88% 10%, rgba(255, 179, 71, .16), transparent 44%),
    linear-gradient(150deg, var(--ink-2) 0%, var(--ink) 100%);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .ab-cta__copy h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 5.4vw, 34px);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.25;
}

.page-about .ab-cta__copy p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(243, 247, 242, .78);
  max-width: 40em;
}

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

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

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

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

  .page-about .ab-panel {
    padding: 34px 30px;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: calc(var(--header-h) + 78px) 0 92px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: 1.04fr .96fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .ab-hero .lede {
    font-size: 17px;
  }

  .page-about .ab-chapter__split {
    grid-template-columns: 1.15fr .85fr;
    align-items: start;
    gap: 34px;
  }

  .page-about .ab-split {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 34px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: 1.25fr .75fr;
    gap: 34px;
  }

  .page-about .ab-chapter {
    padding-top: 56px;
  }

  .page-about .ab-badge:hover .ab-badge__pop,
  .page-about .ab-badge:focus-within .ab-badge__pop {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

@media (min-width: 980px) {
  .page-about .ab-body__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-index__list a {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    background: transparent;
    padding: 9px 10px;
    clip-path: none;
    color: rgba(16, 35, 30, .62);
  }

  .page-about .ab-index__list a:hover,
  .page-about .ab-index__list a:focus-visible {
    transform: translateX(2px);
    border-left-color: var(--grass);
    color: var(--ink);
    background: rgba(156, 255, 87, .14);
  }

  .page-about .ab-stream {
    max-width: 820px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__list a,
  .page-about .ab-badge,
  .page-about .ab-badge__pop,
  .page-about .ab-tl__item::before {
    transition: none;
  }

  .page-about .ab-index__list a:hover,
  .page-about .ab-tl__item:hover::before {
    transform: none;
  }
}