.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.28;
}

/* ---------- 首屏深绿色带 ---------- */
.page-about .ab-hero {
  position: relative;
  background: linear-gradient(155deg, #0B2B22 0%, #071C16 70%, #0B2B22 100%);
  color: var(--paper);
  padding: clamp(24px, 4vw, 44px) 0 clamp(38px, 6vw, 76px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(198, 255, 60, .07) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(198, 255, 60, .05) 0 1px, transparent 1px 88px);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -26%;
  width: min(48vw, 520px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%, rgba(198, 255, 60, .2), transparent 68%);
  pointer-events: none;
}

.page-about .ab-crumb {
  position: relative;
  z-index: 1;
  margin: 0 0 clamp(20px, 3vw, 36px);
  font-size: 13px;
  color: var(--moss);
}

.page-about .ab-crumb a {
  color: var(--signal);
  text-decoration: none;
}

.page-about .ab-crumb a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-hero__eyebrow {
  color: var(--signal);
  margin: 0 0 14px;
}

.page-about .ab-hero h1 {
  color: var(--paper);
  font-size: clamp(29px, 4.6vw, 52px);
  line-height: 1.16;
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-about .ab-hero__lede {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.85;
  color: rgba(245, 241, 228, .78);
}

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

.page-about .ab-hero .btn--ghost {
  color: var(--paper);
  border: 1px solid rgba(245, 241, 228, .38);
}

.page-about .ab-hero__side {
  border-top: 1px solid rgba(245, 241, 228, .2);
  padding-top: 16px;
}

.page-about .ab-hero__sidetitle {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-fact__lb {
  font-size: 13px;
  color: rgba(245, 241, 228, .64);
}

/* ---------- 正文与侧栏 ---------- */
.page-about .ab-body {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
  padding-top: clamp(38px, 6vw, 78px);
  padding-bottom: clamp(44px, 7vw, 92px);
}

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

.page-about .ab-sec {
  padding: clamp(30px, 4.4vw, 56px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: 16px;
}

.page-about .section__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
  letter-spacing: .14em;
  color: var(--orange);
  border: 1px solid currentColor;
  border-radius: 4px;
  padding: 4px 8px;
}

.page-about .section__title {
  flex: 1 1 auto;
  margin: 0;
  font-size: clamp(23px, 3vw, 35px);
}

.page-about .ab-lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: 46ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 图片 ---------- */
.page-about .ab-fig {
  margin: 0;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
  background: linear-gradient(140deg, var(--green), var(--green-deep));
}

.page-about .ab-fig--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-fig figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--moss);
}

.page-about .ab-fig--lead {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .ab-tl__fig {
  margin-top: 14px;
}

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

.page-about .ab-tl__item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 30px;
}

.page-about .ab-tl__axis {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 4px;
}

.page-about .ab-tl__axis::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 26px;
  bottom: -30px;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(var(--line), var(--line-soft));
}

.page-about .ab-tl__item:last-child .ab-tl__axis::before {
  bottom: auto;
  height: 12px;
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .ab-tl__dot {
  position: relative;
  z-index: 1;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--orange);
}

.page-about .ab-tl__item--now .ab-tl__year {
  color: var(--green);
}

.page-about .ab-tl__item--now .ab-tl__dot {
  background: var(--signal);
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(198, 255, 60, .22);
}

.page-about .ab-tl__card {
  min-width: 0;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  padding: clamp(16px, 2vw, 22px);
}

.page-about .ab-tl__card h3 {
  margin: 8px 0 8px;
  font-size: clamp(16px, 1.5vw, 20px);
}

.page-about .ab-tl__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-tl__card .tag {
  margin-bottom: 2px;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .ab-team__row {
  background: var(--khaki);
  border: 1px solid rgba(33, 26, 18, .06);
  border-radius: var(--r-md);
  padding: clamp(15px, 2vw, 22px);
  transition: box-shadow .32s var(--ease), transform .32s var(--ease);
}

.page-about .ab-team__row:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(11, 43, 34, .1);
}

.page-about .ab-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .ab-team__role {
  margin: 0;
  font-size: clamp(16px, 1.3vw, 18px);
}

.page-about .ab-team__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--green);
  white-space: nowrap;
}

.page-about .ab-team__track {
  height: 10px;
  border-radius: 999px;
  background: rgba(33, 26, 18, .1);
  overflow: hidden;
}

.page-about .ab-team__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--signal);
}

.page-about .ab-team__row:nth-child(1) .ab-team__fill { width: 39%; }
.page-about .ab-team__row:nth-child(2) .ab-team__fill { width: 32%; background: var(--blue); }
.page-about .ab-team__row:nth-child(3) .ab-team__fill { width: 29%; background: var(--moss); }

.page-about .ab-team__duty {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .ab-team__row:hover .ab-team__duty {
  color: var(--ink);
}

/* ---------- 数据流程 ---------- */
.page-about .ab-pipe {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-pipe__step {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--green);
  border-radius: var(--r-md);
  padding: clamp(16px, 2.2vw, 24px);
}

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

.page-about .ab-pipe__step h3 {
  margin: 8px 0 8px;
  font-size: clamp(16px, 1.3vw, 18px);
}

.page-about .ab-pipe__step p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

/* ---------- 三条标准 ---------- */
.page-about .ab-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2vw, 22px);
}

.page-about .ab-rule {
  background: var(--white);
  border-radius: var(--r-md);
  border-top: 3px solid var(--signal);
  padding: clamp(18px, 2.2vw, 26px);
  box-shadow: 0 1px 0 rgba(33, 26, 18, .06);
}

.page-about .ab-rule:nth-child(2) { border-top-color: var(--blue); }
.page-about .ab-rule:nth-child(3) { border-top-color: var(--orange); }

.page-about .ab-rule__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--moss);
}

.page-about .ab-rule h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.4vw, 19px);
}

.page-about .ab-rule p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--ink-soft);
}

/* ---------- 长期节奏 ---------- */
.page-about .ab-longrun {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .ab-longrun__item {
  background: var(--khaki);
  border-radius: var(--r-md);
  padding: clamp(16px, 2.2vw, 24px);
}

.page-about .ab-longrun__item h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.page-about .ab-longrun__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .ab-longrun__num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--green);
}

/* ---------- 迷你目录 ---------- */
.page-about .ab-mini {
  min-width: 0;
}

.page-about .ab-mini__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .ab-mini .toc__link {
  display: block;
  margin-bottom: 4px;
  padding: 4px 0 4px 12px;
  border-left: 2px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--moss);
  text-decoration: none;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.page-about .ab-mini .toc__link:hover {
  color: var(--ink);
}

.page-about .ab-mini .toc__link[aria-current="true"] {
  color: var(--ink);
  font-weight: 700;
  border-left-color: var(--signal);
}

/* ---------- 页尾承诺带 ---------- */
.page-about .ab-outro {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: clamp(20px, 3vw, 40px);
  background: var(--green-deep);
  color: var(--paper);
}

.page-about .ab-outro__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
}

.page-about .ab-outro__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(42px, 7vw, 88px);
  padding-bottom: clamp(42px, 7vw, 88px);
}

.page-about .ab-outro__eyebrow {
  margin: 0 0 12px;
  color: var(--signal);
}

.page-about .ab-outro h2 {
  margin: 0 0 16px;
  color: var(--paper);
  font-size: clamp(23px, 3.2vw, 38px);
}

.page-about .ab-outro__text {
  margin: 0 0 24px;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(245, 241, 228, .8);
}

.page-about .ab-outro__text a {
  color: var(--signal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .ab-outro .btn--ghost {
  color: var(--paper);
  border: 1px solid rgba(245, 241, 228, .38);
}

.page-about .ab-outro__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: .05em;
  color: rgba(245, 241, 228, .55);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .ab-team,
  .page-about .ab-longrun {
    gap: 18px;
  }
}

@media (min-width: 820px) {
  .page-about .ab-pipe {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(22px, 2.6vw, 32px);
  }

  .page-about .ab-pipe__step:not(:last-child)::after {
    content: "→";
    position: absolute;
    top: 50%;
    right: -22px;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 16px;
    line-height: 1;
    color: var(--orange);
  }

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

  .page-about .ab-longrun {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 1.35fr .85fr;
    align-items: end;
  }

  .page-about .ab-tl__item {
    grid-template-columns: minmax(0, 1fr) 96px minmax(0, 1fr);
    column-gap: 0;
    padding-bottom: 38px;
  }

  .page-about .ab-tl__axis {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .ab-tl__card {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .ab-tl__item:nth-child(even) .ab-tl__card {
    grid-column: 1;
  }

  .page-about .ab-tl__axis::before {
    bottom: -38px;
  }

  .page-about .ab-tl__item:last-child .ab-tl__axis::before {
    bottom: auto;
    height: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-body {
    grid-template-columns: minmax(0, 1fr) 208px;
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-about .ab-mini {
    position: sticky;
    top: 112px;
    align-self: start;
  }
}

@media (max-width: 420px) {
  .page-about .ab-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-tl__item {
    grid-template-columns: 46px minmax(0, 1fr);
    column-gap: 12px;
  }
}

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

  .page-about .ab-team__row:hover {
    transform: none;
  }
}