/* ===== 品牌价值页 · page-about ===== */

.page-about {
  --ab-rule: rgba(75, 74, 71, .2);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background: var(--wine);
  color: var(--paper);
  border-bottom: var(--bw) solid var(--stone);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: -130px;
  top: -110px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: repeating-radial-gradient(circle, rgba(34, 224, 214, .17) 0 1px, transparent 1px 27px);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -60px;
  bottom: -90px;
  width: 210px;
  height: 210px;
  border: var(--bw) solid rgba(232, 199, 123, .28);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  padding: 28px 0 44px;
}

.page-about .ab-hero .breadcrumb {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold);
  margin-bottom: 18px;
}

.page-about .ab-hero .breadcrumb a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

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

.page-about .ab-hero__kicker {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--paper);
  text-shadow: 4px 4px 0 var(--wine-deep);
}

.page-about .ab-hero__lead {
  font-size: 17px;
  line-height: 1.78;
  color: rgba(244, 239, 230, .9);
  border-left: 6px solid var(--cyan);
  padding-left: 16px;
  margin: 0 0 24px;
  max-width: 62ch;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--wine-deep);
  border: var(--bw) solid var(--wine-deep);
  margin: 0 0 26px;
}

.page-about .ab-hero__stats > div {
  background: var(--wine);
  padding: 12px 14px;
}

.page-about .ab-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .ab-hero__stats dd {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.1;
  color: var(--paper);
}

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

.page-about .ab-hero__figure {
  margin: 0;
  border: var(--bw) solid var(--gold);
  box-shadow: 6px 6px 0 var(--wine-deep);
  background: var(--wine-deep);
}

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

.page-about .ab-hero__figure figcaption {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold);
  padding: 10px 12px;
  border-top: var(--bw) solid var(--gold);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-main {
  background: var(--paper);
  padding: 34px 0 8px;
}

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

.page-about .ab-rail {
  display: none;
}

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

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  padding: 0 0 42px;
  scroll-margin-top: calc(var(--sticky-offset) + 12px);
}

.page-about .ab-sec + .ab-sec {
  border-top: 2px solid var(--ab-rule);
  padding-top: 34px;
}

.page-about .ab-sec--last {
  padding-bottom: 24px;
}

.page-about .ab-prose p {
  font-size: 17px;
  line-height: 1.78;
  margin: 0 0 16px;
  color: var(--ink);
}

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

.page-about .ab-prose strong {
  background: linear-gradient(transparent 62%, rgba(232, 199, 123, .65) 62%);
  font-weight: 700;
}

.page-about .ab-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-list li {
  background: var(--card);
  border: var(--bw) solid var(--stone);
  box-shadow: 4px 4px 0 var(--stone);
  padding: 12px 14px;
  font-size: 16px;
  line-height: 1.7;
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-list li:hover {
  transform: translate(-2px, -2px);
  border-color: var(--cyan);
}

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

/* ---------- 图 ---------- */
.page-about .ab-figure {
  margin: 26px 0 0;
  border: var(--bw) solid var(--stone);
  box-shadow: var(--shadow);
  background: var(--card);
}

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

.page-about .ab-figure figcaption {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--stone);
  padding: 10px 12px;
  border-top: var(--bw) solid var(--stone);
}

/* ---------- 事实带 ---------- */
.page-about .ab-band {
  background: var(--wine-deep);
  border-top: var(--bw) solid var(--gold);
  border-bottom: var(--bw) solid var(--gold);
  padding: 24px 18px 26px;
  margin: 0 0 42px;
}

.page-about .ab-band__label {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
  margin: 0 0 16px;
}

.page-about .ab-band__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(232, 199, 123, .35);
  border: 1px solid rgba(232, 199, 123, .35);
}

.page-about .ab-fact {
  background: var(--wine-deep);
  padding: 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: transform .18s var(--ease), background .18s var(--ease);
}

.page-about .ab-fact:hover {
  transform: translateY(-2px);
  background: var(--wine);
}

.page-about .ab-fact__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 28px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-fact__key {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--paper);
  font-family: var(--font-mono);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 24px;
  border-left: var(--bw) solid var(--stone);
}

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

.page-about .ab-tl__item:last-child {
  padding-bottom: 4px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--gold);
  border: 2px solid var(--paper);
  transition: background .18s var(--ease), transform .18s var(--ease);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before {
  background: var(--cyan);
  transform: scale(1.35);
}

.page-about .ab-tl__year {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--clay);
  margin: 0 0 4px;
}

.page-about .ab-tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .ab-tl__note {
  font-size: 16px;
  line-height: 1.72;
  color: var(--stone);
  margin: 0;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height .3s var(--ease), opacity .3s var(--ease);
}

.page-about .ab-tl__item:hover .ab-tl__note,
.page-about .ab-tl__item:focus-within .ab-tl__note {
  max-height: 7em;
  opacity: 1;
}

@media (hover: none) {
  .page-about .ab-tl__note {
    max-height: none;
    opacity: 1;
  }
}

/* ---------- 合作名录 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: 22px 0 22px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-partner {
  background: var(--card);
  border: var(--bw) solid var(--stone);
  border-left: 8px solid var(--cyan);
  box-shadow: 4px 4px 0 var(--stone);
  padding: 14px 16px;
  transition: transform .18s var(--ease), border-left-color .18s var(--ease);
}

.page-about .ab-partner:hover {
  transform: translateY(-2px);
  border-left-color: var(--magenta);
}

.page-about .ab-partner__tag {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--clay);
  margin: 0 0 6px;
}

.page-about .ab-partner__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 引用与复制 ---------- */
.page-about .ab-quote {
  background: var(--card);
  border: var(--bw) solid var(--stone);
  border-left: 8px solid var(--cyan);
  box-shadow: var(--shadow);
  padding: 20px 18px;
  margin: 0 0 24px;
}

.page-about .ab-quote__text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.65;
  color: var(--ink);
  margin: 0 0 14px;
}

.page-about .ab-quote__copy {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

/* ---------- 宽屏双栏首屏 ---------- */
@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 46px;
    align-items: center;
    padding: 46px 0 62px;
  }

  .page-about .ab-hero__figure {
    align-self: center;
  }
}

/* ---------- 左轨 + 正文 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-main {
    padding: 52px 0 12px;
  }

  .page-about .ab-main__grid {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: var(--sticky-offset);
    align-self: start;
  }

  .page-about .ab-rail__label {
    font-size: 13px;
    letter-spacing: .14em;
    color: var(--stone-light);
    margin: 0 0 14px;
  }

  .page-about .ab-rail__list {
    list-style: none;
    margin: 0;
    padding: 0 0 0 18px;
    border-left: 2px solid var(--stone-light);
  }

  .page-about .ab-rail__list > li {
    position: relative;
  }

  .page-about .ab-rail__list > li::before {
    content: "";
    position: absolute;
    left: -25px;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--stone-light);
    transition: background .18s var(--ease), transform .18s var(--ease);
  }

  .page-about .ab-rail__list > li:hover::before {
    background: var(--cyan);
    transform: scale(1.4);
  }

  .page-about .ab-rail__link {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 7px 0;
    font-size: 14px;
    line-height: 1.5;
    color: var(--stone);
    text-decoration: none;
    transition: color .18s var(--ease), transform .18s var(--ease);
  }

  .page-about .ab-rail__link .mono {
    font-size: 13px;
    color: var(--stone-light);
    transition: color .18s var(--ease);
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    color: var(--ink);
    transform: translateX(3px);
  }

  .page-about .ab-rail__link:hover .mono,
  .page-about .ab-rail__link:focus-visible .mono {
    color: var(--clay);
  }

  .page-about .ab-tl {
    padding-left: 28px;
  }

  .page-about .ab-tl__item::before {
    left: -36px;
  }
}

/* ---------- 窄屏防溢出 ---------- */
@media (max-width: 420px) {
  .page-about .ab-hero__title {
    font-size: 28px;
  }

  .page-about .ab-band {
    padding: 20px 14px 22px;
  }

  .page-about .ab-fact__num {
    font-size: 24px;
  }

  .page-about .ab-actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-list li,
  .page-about .ab-fact,
  .page-about .ab-partner,
  .page-about .ab-rail__link,
  .page-about .ab-tl__item::before,
  .page-about .ab-rail__list > li::before,
  .page-about .ab-tl__note {
    transition: none;
  }

  .page-about .ab-list li:hover,
  .page-about .ab-fact:hover,
  .page-about .ab-partner:hover,
  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible,
  .page-about .ab-rail__list > li:hover::before,
  .page-about .ab-tl__item:hover::before,
  .page-about .ab-tl__item:focus-within::before {
    transform: none;
  }
}