/* ===== 品牌故事 /story/ ===== */
.page-about {
  --ab-rail: 244px;
  --ab-flow: 62ch;
  --ab-grad: linear-gradient(180deg, var(--gold), var(--green) 44%, var(--clay));
  background: var(--void);
  color: var(--silver);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about [data-reveal] {
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

.page-about [data-filtered="out"] {
  display: none;
}

/* --- 面包屑 --- */
.page-about .ab-crumbs-row {
  padding-top: calc(var(--head-h) + 18px);
  padding-bottom: 4px;
}

/* --- 首屏 --- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(26px, 4.6vw, 56px) 0 clamp(44px, 7vw, 88px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(620px, 78vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(232, 195, 106, .14), rgba(232, 195, 106, 0) 62%);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 clamp(16px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-about .ab-hero__kicker::before {
  content: "";
  flex: none;
  width: 44px;
  height: 2px;
  background: var(--clay);
}

.page-about .ab-hero__title {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 7.6vw, 5.4rem);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--bone);
  overflow-wrap: break-word;
}

.page-about .ab-hero__lede {
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  max-width: 58ch;
  font-size: clamp(1rem, .34vw + .94rem, 1.12rem);
  line-height: 1.82;
  color: var(--silver);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--edge);
  box-shadow: var(--shadow);
}

.page-about .ab-stat {
  background: var(--pod);
  padding: 18px 20px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--bone);
}

.page-about .ab-stat__cap {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--rock);
}

.page-about .ab-hero__track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--clay), rgba(180, 105, 74, 0) 64%);
}

/* --- 左侧索引 + 右侧叙事 --- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 64px);
  padding-top: clamp(30px, 5vw, 60px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .ab-rail {
  align-self: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-about .ab-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0 0 clamp(18px, 3vw, 28px);
  padding: 0;
  list-style: none;
}

.page-about .ab-rail__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--orange);
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clay);
}

.page-about .ab-rail__years {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.95;
  letter-spacing: .05em;
  color: var(--rock);
}

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

.page-about .section.ab-ch {
  padding: clamp(38px, 5.5vw, 66px) 0 0;
}

.page-about .section.ab-ch:first-child {
  padding-top: 0;
}

.page-about .section.ab-ch + .ab-ch {
  border-top: 1px solid var(--line);
}

.page-about .ab-ch .sec-title {
  margin: 10px 0 clamp(20px, 3vw, 28px);
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1.24;
  letter-spacing: -.015em;
  color: var(--bone);
}

.page-about .ab-ch p {
  margin: 0 0 1.05em;
  max-width: var(--ab-flow);
  font-size: clamp(.99rem, .22vw + .94rem, 1.06rem);
  line-height: 1.82;
  color: var(--silver);
}

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

.page-about .ab-ch a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 195, 106, .42);
}

.page-about .ab-ch a:hover,
.page-about .ab-ch a:focus-visible {
  border-bottom-color: var(--gold);
}

/* --- 四条内容线 --- */
.page-about .ab-lines {
  display: grid;
  gap: 2px;
  margin: 0 0 clamp(20px, 3vw, 30px);
  background: var(--line);
  border: var(--edge);
  box-shadow: var(--shadow);
}

.page-about .ab-line {
  display: grid;
  gap: 7px;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 3vw, 28px);
  background: var(--pod);
  border-left: 5px solid var(--acc, var(--silver));
}

.page-about .ab-line--honor { --acc: var(--gold); }
.page-about .ab-line--poss  { --acc: var(--green); }
.page-about .ab-line--sub   { --acc: var(--orange); }
.page-about .ab-line--clay  { --acc: var(--clay); }

.page-about .ab-line__name {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.16rem;
  color: var(--bone);
}

.page-about .ab-line__name em {
  font-style: normal;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--acc, var(--silver));
  border: 1px solid currentColor;
}

.page-about .ab-line__who {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .ab-line__text {
  margin: 0;
  max-width: 68ch;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--silver);
}

/* --- 图片与引用 --- */
.page-about .ab-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

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

.page-about .ab-quote {
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: clamp(18px, 3vw, 26px) clamp(18px, 3vw, 30px);
  background: var(--pod-2);
  border-left: 4px solid var(--green);
  font-size: clamp(1rem, .3vw + .95rem, 1.1rem);
  line-height: 1.8;
  color: var(--bone);
}

/* --- 团队与节奏 --- */
.page-about .ab-split {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .ab-split__media {
  margin: 0;
  max-width: 260px;
}

/* --- 时间轴 --- */
.page-about .ab-filter {
  margin: 0 0 clamp(20px, 3vw, 28px);
}

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--ab-grad);
  opacity: .55;
}

.page-about .ab-node {
  position: relative;
  margin: 0 0 14px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 15px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--acc, var(--silver));
  transition: background .2s var(--ease);
}

.page-about .ab-node--list  { --acc: var(--gold); }
.page-about .ab-node--model { --acc: var(--green); }
.page-about .ab-node--query { --acc: var(--clay); }

.page-about .ab-node__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 400;
}

.page-about .ab-node details {
  background: var(--pod);
  border-left: 4px solid var(--acc, var(--silver));
}

.page-about .ab-node summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 3px 16px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-node summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
}

.page-about .ab-node__ver {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--acc, var(--silver));
}

.page-about .ab-node__name {
  grid-column: 1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.04rem;
  line-height: 1.36;
  color: var(--bone);
}

.page-about .ab-node__mark {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--rock);
  transition: transform .22s var(--ease), color .22s var(--ease);
}

.page-about .ab-node details[open] .ab-node__mark,
.page-about .ab-node details[data-open="true"] .ab-node__mark {
  transform: rotate(45deg);
  color: var(--bone);
}

.page-about .ab-node__body {
  padding: 0 18px 16px;
}

.page-about .ab-node__body p {
  margin: 0;
  max-width: 66ch;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: .95rem;
  line-height: 1.78;
  color: var(--silver);
}

/* --- 结尾轨道 --- */
.page-about .ab-cta-wrap {
  margin-top: clamp(44px, 6vw, 76px);
  border-top: 1px solid var(--line);
  padding-top: clamp(32px, 5vw, 56px);
}

/* --- 响应式 --- */
@media (min-width: 720px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .ab-shell {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--head-h) + 28px);
    padding-bottom: 0;
    border-bottom: 0;
    border-left: var(--edge);
    padding-left: 20px;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .ab-rail__link {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}