/* ===== 品牌历程 · 页面专属样式（作用域：.page-about） ===== */

.page-about {
  --ab-cell: 32px;
  --ab-rail-gap: 42px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 26px 0 52px;
  border-bottom: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 92% at 88% 0%, rgba(31, 111, 92, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(201, 162, 39, 0.09), transparent 72%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(16, 35, 58, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(16, 35, 58, 0.07) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .ab-hero__crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .ab-hero__crumbs .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--gold);
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: 0.025em;
  margin: 14px 0 20px;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .ab-hero__lead {
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ink);
  max-width: 62ch;
  margin: 0 0 22px;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .ab-hero__facts li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--rock);
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__facts b {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--green);
}

.page-about .ab-hero__cta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 阶段索引卡 ---------- */
.page-about .ab-jump {
  border: 1px solid var(--line-strong);
  background: var(--warm);
  padding: 18px 18px 12px;
  box-shadow: 5px 5px 0 var(--kraft);
}

.page-about .ab-jump__cap {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--gold);
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}

.page-about .ab-jump__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-jump__list a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 9px 6px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: background 180ms ease, padding-left 180ms ease;
}

.page-about .ab-jump__list li:last-child a {
  border-bottom: 0;
}

.page-about .ab-jump__list a:hover,
.page-about .ab-jump__list a:focus-visible {
  background: rgba(31, 111, 92, 0.07);
  padding-left: 12px;
}

.page-about .ab-jump__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold);
  letter-spacing: 0.08em;
}

/* ---------- 时间轴段落 ---------- */
.page-about .ab-intro {
  margin: 14px 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--rock);
  max-width: 66ch;
}

.page-about .ab-stages {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
}

.page-about .ab-stage {
  position: relative;
  padding-left: var(--ab-rail-gap);
  padding-bottom: 46px;
  scroll-margin-top: 108px;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: var(--line-strong);
}

.page-about .ab-stage:last-child {
  padding-bottom: 0;
}

.page-about .ab-stage:last-child::before {
  bottom: auto;
  height: 60px;
}

.page-about .ab-stage__rail {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 14px;
}

.page-about .ab-stage__rail::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow:
    0 0 0 4px var(--paper),
    0 0 0 5px rgba(16, 35, 58, 0.22);
}

.page-about .ab-stage--2021 .ab-stage__rail::before,
.page-about .ab-stage--migrate .ab-stage__rail::before {
  background: var(--grad-mint);
}

.page-about .ab-stage__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2rem, 9.5vw, 3.2rem);
  line-height: 0.92;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-stage__idx {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--green);
  background: rgba(31, 111, 92, 0.08);
  border: 1px solid rgba(31, 111, 92, 0.28);
  padding: 4px 9px;
}

/* 阶段卡片：网格底纹密度逐级变化，提示时代切换 */
.page-about .ab-stage__body {
  background-color: var(--warm);
  background-image:
    linear-gradient(to right, rgba(16, 35, 58, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(16, 35, 58, 0.05) 1px, transparent 1px);
  background-size: var(--ab-cell) var(--ab-cell);
  border: 1px solid var(--line);
  box-shadow: 5px 5px 0 var(--kraft);
  padding: 22px 20px 24px;
  max-width: 820px;
}

.page-about .ab-stage--2013 .ab-stage__body { --ab-cell: 48px; }
.page-about .ab-stage--2017 .ab-stage__body { --ab-cell: 36px; }
.page-about .ab-stage--2021 .ab-stage__body { --ab-cell: 26px; }
.page-about .ab-stage--migrate .ab-stage__body { --ab-cell: 20px; }
.page-about .ab-stage--scale .ab-stage__body { --ab-cell: 30px; }
.page-about .ab-stage--team .ab-stage__body { --ab-cell: 40px; }

.page-about .ab-stage__body h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 4.2vw, 1.6rem);
  line-height: 1.32;
  letter-spacing: 0.03em;
  color: var(--ink);
  margin: 0 0 14px;
}

.page-about .ab-stage__body h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.05em;
  color: var(--green);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-stage__body p {
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ink);
  margin: 0 0 14px;
}

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

/* 要点列表 */
.page-about .ab-points {
  list-style: none;
  margin: 16px 0 4px;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .ab-points li {
  position: relative;
  padding-left: 22px;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--rock);
}

.page-about .ab-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 12px;
  height: 2px;
  background: var(--gold);
}

/* 图 */
.page-about .ab-figure {
  margin: 20px 0 0;
}

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

.page-about .ab-figure .figure__cap {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--rock);
}

/* 折叠对照卡 */
.page-about .ab-tree {
  margin: 18px 0 4px;
  border: 1px solid var(--line-strong);
  background: rgba(245, 241, 230, 0.7);
}

.page-about .ab-tree summary {
  cursor: pointer;
  padding: 13px 16px;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  list-style: none;
}

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

.page-about .ab-tree .panel__body {
  padding: 4px 16px 18px;
}

.page-about .ab-tree__grid {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.page-about .ab-tree__grid li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-align: center;
  padding: 12px 4px;
  color: var(--gold);
  background: var(--warm);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
}

.page-about .ab-tree__note {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--rock);
}

/* 统计数字 */
.page-about .ab-stats {
  list-style: none;
  margin: 20px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .ab-stat {
  padding-bottom: 6px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 8vw, 2.6rem);
  line-height: 1;
  color: var(--green);
  border-bottom: 2px solid var(--gold);
  padding-bottom: 9px;
  margin-bottom: 10px;
}

.page-about .ab-stat__num small {
  font-size: 0.42em;
  letter-spacing: 0.04em;
  margin-left: 3px;
  color: var(--rock);
}

.page-about .ab-stat__label {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.page-about .ab-note {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--rock);
  padding-left: 14px;
  border-left: 2px solid var(--moss);
}

/* 团队两栏 */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: 6px 0 4px;
}

.page-about .ab-rows {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-rows li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line-strong);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .ab-rows li:last-child {
  border-bottom: 0;
}

.page-about .ab-rows span {
  color: var(--rock);
}

.page-about .ab-rows b {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-align: right;
}

.page-about .ab-inline-link {
  margin: 18px 0 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--rock);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .ab-inline-link a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

.page-about .ab-inline-link a:hover,
.page-about .ab-inline-link a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--amber);
}

/* ---------- 压缩时间轴 ---------- */
.page-about .ab-mini-section {
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(31, 111, 92, 0.06), transparent 70%);
}

.page-about .ab-mini {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .ab-mini__item {
  position: relative;
  padding: 0 0 18px 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .ab-mini__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-mini__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .ab-mini__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin-bottom: 5px;
}

.page-about .ab-mini__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ink);
}

/* ---------- 收束 CTA ---------- */
.page-about .ab-cta__box {
  border: 1px solid var(--line-strong);
  background: var(--warm);
  box-shadow: 6px 6px 0 var(--kraft);
  padding: 26px 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  position: relative;
  overflow: hidden;
}

.page-about .ab-cta__box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--grad-mint);
}

.page-about .ab-cta__text h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 4.4vw, 1.75rem);
  line-height: 1.32;
  letter-spacing: 0.03em;
  margin: 0 0 12px;
  color: var(--ink);
}

.page-about .ab-cta__text p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--rock);
  max-width: 58ch;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-tree__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

  .page-about .ab-cta__box {
    padding: 32px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 34px 0 72px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) 286px;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-hero h1 {
    max-width: 20ch;
  }

  .page-about .ab-hero__lead {
    font-size: 1.0625rem;
  }

  .page-about .ab-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .ab-hero__facts li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    border-bottom: 0;
    border-top: 2px solid var(--gold);
    padding: 12px 0 0;
  }

  .page-about .ab-stages {
    margin-top: 52px;
  }

  .page-about .ab-stage {
    padding-left: 88px;
    padding-bottom: 68px;
  }

  .page-about .ab-stage::before {
    left: 27px;
    top: 14px;
  }

  .page-about .ab-stage__rail {
    margin-bottom: 18px;
    gap: 18px;
  }

  .page-about .ab-stage__rail::before {
    left: -62px;
    top: 14px;
    width: 13px;
    height: 13px;
  }

  .page-about .ab-stage__year {
    font-size: 4.4rem;
  }

  .page-about .ab-stage__body {
    padding: 28px 30px 30px;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .ab-mini {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 12px;
    margin-top: 38px;
  }

  .page-about .ab-mini__item {
    padding: 26px 14px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-strong);
  }

  .page-about .ab-mini__item::before {
    left: 0;
    top: -5px;
  }

  .page-about .ab-cta__box {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    padding: 38px 40px;
  }

  .page-about .ab-cta__actions {
    flex-wrap: nowrap;
  }
}

@media (min-width: 1160px) {
  .page-about .ab-stage__body {
    max-width: 760px;
    padding: 32px 36px 34px;
  }

  .page-about .ab-stage--2017 .ab-stage__body,
  .page-about .ab-stage--migrate .ab-stage__body {
    margin-left: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-jump__list a {
    transition: none;
  }
}
</final>