/* ========== 品牌故事页 · 页面作用域 ========== */
.page-about {
  --ab-gold-line: rgba(201, 161, 75, .44);
  --ab-gold-soft: rgba(201, 161, 75, .2);
  --ab-hair: rgba(34, 29, 27, .13);
  --ab-card-bg: #FFFDF7;
  background: var(--paper);
  color: var(--ink-text);
  overflow-x: clip;
}

.page-about .zl-eyebrow {
  color: var(--red-deep);
  margin-bottom: 0;
}

.page-about .ab-h2 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.34;
  letter-spacing: -.005em;
  color: var(--ink-text);
  margin: 12px 0 18px;
  max-width: 19em;
}

.page-about .ab-lead {
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-soft);
  max-width: 36em;
  margin: 0 0 4px;
}

/* ========== 首屏 ========== */
.page-about .ab-hero {
  position: relative;
  padding: clamp(30px, 5vw, 46px) 0 clamp(170px, 32vw, 290px);
  background: var(--paper);
  overflow: hidden;
}

.page-about .ab-hero__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .09;
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(146px, 27vw, 264px);
  z-index: 1;
  background: linear-gradient(118deg, var(--red-deep) 0%, var(--ink-warm) 46%, var(--ink) 100%);
  clip-path: polygon(0 100%, 0 0, 86% 100%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .ab-hero .zl-crumb {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .ab-hero__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--ink-text);
  margin: 14px 0 22px;
  max-width: 13em;
}

.page-about .ab-hero__lead {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.9;
  color: #4A423D;
  max-width: 33em;
  margin: 0 0 26px;
}

.page-about .ab-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--red-deep);
  border: 1px solid rgba(142, 27, 34, .26);
  background: rgba(142, 27, 34, .035);
}

/* ========== 区块节奏与鎏金细线分隔 ========== */
.page-about .ab-sec {
  position: relative;
}

.page-about .ab-sec + .ab-sec::before {
  content: "";
  position: absolute;
  left: 7%;
  right: 7%;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(201, 161, 75, 0) 0%,
    var(--ab-gold-line) 20%,
    var(--ab-gold-line) 80%,
    rgba(201, 161, 75, 0) 100%);
}

/* ========== 起点 ========== */
.page-about .ab-begin__grid {
  display: grid;
  gap: clamp(24px, 5vw, 44px);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .ab-begin__text p {
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-soft);
  margin: 0 0 18px;
  max-width: 32em;
}

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

.page-about .ab-begin__aside {
  position: relative;
  padding-left: 20px;
  border-left: 3px solid var(--red-cinnabar);
}

.page-about .ab-begin__quote {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 3.1vw, 25px);
  line-height: 1.62;
  color: var(--ink-text);
  margin: 0 0 14px;
  max-width: 18em;
}

.page-about .ab-begin__aside-note {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
  max-width: 26em;
}

/* ========== 时间轴 ========== */
.page-about .ab-tl-head {
  display: grid;
  gap: 22px;
  align-items: end;
  margin-bottom: clamp(28px, 5vw, 46px);
}

.page-about .ab-tl-head__copy .ab-lead {
  margin-top: 0;
}

.page-about .ab-tl-head__mark {
  width: 116px;
  height: 116px;
  object-fit: cover;
  border: 1px solid var(--ab-gold-line);
  justify-self: start;
}

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--red-deep) 0%,
    var(--ab-gold-line) 34%,
    var(--ab-gold-soft) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-left: 36px;
  margin-bottom: 14px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 15px;
  height: 15px;
  background: var(--red-deep);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
  transition: background .26s var(--ease);
}

.page-about .ab-tl__item:nth-child(2n)::before {
  background: var(--red-cinnabar);
}

.page-about .ab-tl__item:nth-child(3n)::before {
  background: var(--ink-warm);
}

.page-about .ab-card {
  border: 1px solid var(--ab-hair);
  border-left: 4px solid var(--red-deep);
  background: var(--ab-card-bg);
  box-shadow: var(--shadow-card);
}

.page-about .ab-card summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 16px;
  min-height: 44px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-card summary::marker {
  content: "";
}

.page-about .ab-card__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--red-deep);
  padding-top: 3px;
}

.page-about .ab-card__title {
  flex: 1 1 auto;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-text);
  margin: 0;
}

.page-about .ab-card__more {
  flex: 0 0 auto;
  align-self: center;
  position: relative;
  width: 22px;
  height: 22px;
}

.page-about .ab-card__more::before,
.page-about .ab-card__more::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--red-cinnabar);
  transform: translate(-50%, -50%);
}

.page-about .ab-card__more::before {
  width: 12px;
  height: 1.5px;
}

.page-about .ab-card__more::after {
  width: 1.5px;
  height: 12px;
  transition: transform .26s var(--ease);
}

.page-about .ab-card[open] .ab-card__more::after {
  transform: translate(-50%, -50%) scaleY(0);
}

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

.page-about .ab-card__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--ink-soft);
  max-width: 36em;
}

/* ========== 区域覆盖 ========== */
.page-about .ab-cover__list {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-gold-soft);
  border: 1px solid var(--ab-gold-soft);
}

.page-about .ab-zone {
  background: var(--paper);
  padding: 20px 20px 22px;
}

.page-about .ab-zone__name {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: .12em;
  color: var(--red-deep);
  margin-right: 10px;
}

.page-about .ab-zone__sub {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

.page-about .ab-zone__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.86;
  color: var(--ink-soft);
  max-width: 30em;
}

/* ========== 四条产品线 ========== */
.page-about .ab-lines__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .ab-line {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-hair);
  border-left: 4px solid var(--red-deep);
  box-shadow: var(--shadow-card);
}

.page-about .ab-line__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--red-deep);
  margin-bottom: 10px;
}

.page-about .ab-line h3 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.45;
  color: var(--ink-text);
  margin: 0 0 10px;
}

.page-about .ab-line p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--ink-soft);
}

.page-about .ab-lines__figure {
  margin: clamp(28px, 5vw, 46px) 0 0;
}

/* ========== 长期做法 ========== */
.page-about .ab-hold__list {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3.4vw, 30px);
}

.page-about .ab-hold__item {
  padding-left: 20px;
  border-left: 3px solid var(--red-cinnabar);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(17px, 2.6vw, 21px);
  line-height: 1.7;
  color: var(--ink-text);
  max-width: 30em;
}

.page-about .ab-hold__item span {
  display: block;
  margin-top: 9px;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ========== 下一步入口 ========== */
.page-about .ab-next__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .ab-next__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 44px;
  padding: 24px 22px 26px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-hair);
  border-left: 4px solid var(--red-deep);
  color: inherit;
  text-decoration: none;
  transition: border-color .26s var(--ease), transform .26s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: var(--red-cinnabar);
  border-left-color: var(--red-cinnabar);
  transform: translateY(-3px);
}

.page-about .ab-next__card h3 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-text);
  margin: 0;
}

.page-about .ab-next__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ========== 断点 ========== */
@media (min-width: 640px) {
  .page-about .ab-cover__list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 760px) {
  .page-about .ab-tl-head {
    grid-template-columns: 1fr auto;
    gap: 32px;
  }

  .page-about .ab-tl-head__mark {
    width: 152px;
    height: 152px;
    justify-self: end;
  }

  .page-about .ab-lines__grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

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

@media (min-width: 860px) {
  .page-about .ab-begin__grid {
    grid-template-columns: 1.25fr .85fr;
    align-items: start;
    gap: 56px;
  }

  .page-about .ab-tl__item {
    padding-left: 42px;
    margin-bottom: 18px;
  }

  .page-about .ab-tl__item:nth-child(even) {
    margin-left: 52px;
  }

  .page-about .ab-tl__item:nth-child(odd) {
    margin-right: 52px;
  }

  .page-about .ab-card summary {
    padding: 17px 20px;
  }

  .page-about .ab-card__body {
    padding: 0 20px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__card,
  .page-about .ab-card__more::after,
  .page-about .ab-tl__item::before {
    transition: none;
  }

  .page-about .ab-next__card:hover,
  .page-about .ab-next__card:focus-visible {
    transform: none;
  }
}