/* ===== 品牌故事 /about/ 页面专属样式 ===== */
.page-about {
  --ab-hair: rgba(23, 179, 201, .28);
  --ab-hair-soft: rgba(154, 163, 191, .42);
  background: var(--sb-cream);
  color: var(--sb-ink);
  font-family: var(--sb-font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 116px 0 84px;
  background:
    radial-gradient(70% 62% at 76% 6%, rgba(255, 138, 31, .36), transparent 58%),
    radial-gradient(78% 70% at 6% 96%, rgba(108, 75, 224, .32), transparent 62%),
    linear-gradient(178deg, var(--sb-night) 0%, var(--sb-indigo) 62%, #171d47 100%);
  color: var(--sb-cream);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -22% -12% auto -12%;
  height: 64%;
  background: radial-gradient(52% 62% at 68% 32%, rgba(255, 194, 75, .34), transparent 70%);
  animation: ab-glow 8s var(--sb-ease) infinite;
  pointer-events: none;
}

@keyframes ab-glow {
  0%, 100% { opacity: .55; }
  50%      { opacity: .85; }
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 44px;
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--sb-font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--sb-amber);
}

.page-about .ab-hero__title {
  margin: 0 0 24px;
  font-family: var(--sb-font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 6.6vw, 4.9rem);
  line-height: .98;
  letter-spacing: -.02em;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--sb-sun);
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin: 0 0 30px;
  font-size: 1.0625rem;
  color: rgba(247, 242, 232, .84);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* 首屏章节索引 */
.page-about .ab-index {
  padding-left: 20px;
  border-left: 1px solid rgba(23, 179, 201, .42);
}

.page-about .ab-index__label {
  margin: 0 0 14px;
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--sb-mist);
}

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

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: .9rem;
  color: rgba(247, 242, 232, .78);
  text-decoration: none;
  transition: color .22s var(--sb-ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--sb-amber);
}

.page-about .ab-index__num {
  flex: none;
  font-family: var(--sb-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--sb-lake);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline__list {
  position: relative;
  margin: 48px 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .ab-timeline__list::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--sb-lake) 0%, rgba(23, 179, 201, .12) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: 40px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--sb-cream);
  border: 2px solid var(--sb-sun);
  box-shadow: 0 0 0 4px rgba(255, 138, 31, .14);
}

.page-about .ab-tl__year {
  margin: 0 0 8px;
  font-family: var(--sb-font-mono);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--sb-lake-deep);
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.35;
}

.page-about .ab-tl__text {
  max-width: 38em;
  margin: 0;
  font-size: 1rem;
  color: var(--sb-muted);
}

/* ---------- 八个入口 ---------- */
.page-about .ab-lattice {
  list-style: none;
  margin: 46px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-lattice__cell {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--sb-white);
  border: 1px solid var(--ab-hair);
  border-radius: var(--sb-radius-m);
  box-shadow: var(--sb-shadow-card);
  transition: transform .24s var(--sb-ease), border-color .24s var(--sb-ease), box-shadow .24s var(--sb-ease);
}

.page-about .ab-lattice__cell:hover,
.page-about .ab-lattice__cell:focus-within {
  transform: translateY(-6px);
  border-color: var(--sb-lake);
  box-shadow: var(--sb-shadow-card-hover);
}

.page-about .ab-lattice__cell--here {
  border-color: var(--sb-sun);
  background: linear-gradient(180deg, rgba(255, 194, 75, .16), rgba(255, 255, 255, 1) 58%);
}

.page-about .ab-lattice__num {
  margin: 0;
  font-family: var(--sb-font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--sb-sun);
}

.page-about .ab-lattice__name {
  margin: 10px 0 8px;
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .ab-lattice__duty {
  margin: 0;
  font-size: .9375rem;
  color: var(--sb-muted);
}

.page-about .ab-lattice__hint {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--ab-hair-soft);
  font-size: .8125rem;
  color: var(--sb-muted);
  opacity: .62;
  transition: opacity .24s var(--sb-ease);
}

.page-about .ab-lattice__cell:hover .ab-lattice__hint {
  opacity: 1;
}

/* ---------- 基地（斜切深色区块） ---------- */
.page-about .ab-base {
  position: relative;
  margin-top: 84px;
  padding: 88px 0 96px;
  background: linear-gradient(158deg, var(--sb-night) 0%, var(--sb-indigo) 100%);
  color: var(--sb-cream);
  clip-path: polygon(0 2.4%, 100% 0, 100% 97.6%, 0 100%);
}

.page-about .ab-base__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-about .ab-base .sb-section__title {
  color: var(--sb-cream);
}

.page-about .ab-base .sb-section__lede {
  color: rgba(247, 242, 232, .78);
  max-width: 34em;
}

.page-about .ab-base__figure {
  margin: 32px 0 0;
}

.page-about .ab-base__figure .sb-media__caption {
  color: rgba(247, 242, 232, .66);
}

.page-about .ab-roles {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-roles__item {
  padding: 18px 16px;
  background: rgba(247, 242, 232, .06);
  border: 1px solid rgba(23, 179, 201, .32);
  border-radius: var(--sb-radius-s);
}

.page-about .ab-roles__name {
  margin: 0 0 6px;
  font-size: .9375rem;
  font-weight: 800;
  color: var(--sb-amber);
  letter-spacing: .01em;
}

.page-about .ab-roles__text {
  margin: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: rgba(247, 242, 232, .74);
}

.page-about .ab-base__aside {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .ab-base__aside .sb-plaque {
  color: rgba(247, 242, 232, .8);
}

.page-about .ab-base__note {
  margin: 0;
  padding: 18px 18px 18px 20px;
  background: rgba(255, 194, 75, .1);
  border-left: 3px solid var(--sb-amber);
  border-radius: 0 var(--sb-radius-s) var(--sb-radius-s) 0;
  font-size: .9375rem;
  color: rgba(247, 242, 232, .82);
}

/* ---------- 合作伙伴 ---------- */
.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  margin-top: 44px;
}

.page-about .ab-partners__viz {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
}

.page-about .ab-ring {
  width: 100%;
  max-width: 252px;
  height: auto;
  display: block;
}

.page-about .ab-ring__num {
  font-family: var(--sb-font-mono);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -.01em;
  fill: var(--sb-ink);
}

.page-about .ab-ring__unit {
  font-family: var(--sb-font-body);
  font-size: 12px;
  letter-spacing: .18em;
  fill: var(--sb-muted);
}

.page-about .ab-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
  width: 100%;
  max-width: 320px;
}

.page-about .ab-legend__item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .875rem;
  color: var(--sb-muted);
}

.page-about .ab-legend__dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--sb-sun);
}

.page-about .ab-legend__item:nth-child(2) .ab-legend__dot { background: var(--sb-lake); }
.page-about .ab-legend__item:nth-child(3) .ab-legend__dot { background: var(--sb-dusk); }
.page-about .ab-legend__item:nth-child(4) .ab-legend__dot { background: var(--sb-amber); }

.page-about .ab-partners__body p {
  margin: 0 0 1.2em;
  max-width: 34em;
  font-size: 1rem;
  color: var(--sb-muted);
}

.page-about .ab-partners__figure {
  margin: 28px 0 0;
}

/* ---------- 团队节奏 ---------- */
.page-about .ab-facts {
  margin: 44px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-hair-soft);
}

.page-about .ab-facts__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px 20px;
  padding: 18px 12px;
  border-bottom: 1px solid var(--ab-hair-soft);
  transition: background-color .22s var(--sb-ease);
}

.page-about .ab-facts__row:hover {
  background: rgba(23, 179, 201, .1);
}

.page-about .ab-facts__key {
  font-size: .9375rem;
  color: var(--sb-muted);
}

.page-about .ab-facts__val {
  margin: 0;
  font-size: .9375rem;
  font-weight: 700;
  color: var(--sb-ink);
  text-align: right;
}

.page-about .ab-team__notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 40px;
}

.page-about .ab-team__note {
  margin: 0;
  padding-left: 18px;
  border-left: 2px solid var(--sb-lake);
  font-size: .9375rem;
  color: var(--sb-muted);
  max-width: 40em;
}

/* ---------- 价值观收尾 ---------- */
.page-about .ab-values {
  position: relative;
  margin-top: 40px;
  padding-bottom: 104px;
  overflow: hidden;
}

.page-about .ab-values__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-about .ab-values__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  opacity: .16;
  display: block;
}

.page-about .ab-values__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--sb-cream) 0%, rgba(247, 242, 232, .72) 34%, rgba(247, 242, 232, .9) 100%);
}

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

.page-about .ab-values__list {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .ab-values__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 22px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--ab-hair-soft);
}

.page-about .ab-values__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .ab-values__glyphs {
  margin: 0;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--sb-font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  line-height: 1;
  letter-spacing: .22em;
  color: var(--sb-ink);
}

.page-about .ab-values__item:nth-child(1) .ab-values__glyphs { color: var(--sb-sun); }
.page-about .ab-values__item:nth-child(2) .ab-values__glyphs { color: var(--sb-lake-deep); }
.page-about .ab-values__item:nth-child(3) .ab-values__glyphs { color: var(--sb-dusk); }
.page-about .ab-values__item:nth-child(4) .ab-values__glyphs { color: var(--sb-ink); }

.page-about .ab-values__text {
  margin: 0;
  max-width: 32em;
  font-size: 1rem;
  color: var(--sb-muted);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  margin-top: 72px;
  padding: 34px 28px;
  background: var(--sb-white);
  border: 1px solid var(--ab-hair);
  border-radius: var(--sb-radius-l);
  box-shadow: var(--sb-shadow-card);
}

.page-about .ab-next__title {
  margin: 0 0 20px;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -.005em;
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-lattice {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 148px 0 104px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .ab-timeline__list {
    padding-left: 42px;
  }

  .page-about .ab-tl__item {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 32px;
    padding-bottom: 46px;
  }

  .page-about .ab-tl__item::before {
    left: -42px;
    top: 11px;
  }

  .page-about .ab-tl__year {
    margin: 0;
    text-align: left;
    padding-top: 2px;
  }

  .page-about .ab-base {
    margin-top: 108px;
    padding: 112px 0 120px;
  }

  .page-about .ab-base__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-partners__viz {
    position: sticky;
    top: 108px;
  }

  .page-about .ab-values__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 48px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-lattice {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 899px) {
  .page-about .ab-base {
    clip-path: polygon(0 1.2%, 100% 0, 100% 98.8%, 0 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hero::before {
    animation: none;
    opacity: .7;
  }

  .page-about .ab-lattice__cell,
  .page-about .ab-facts__row,
  .page-about .ab-index__link,
  .page-about .ab-lattice__hint {
    transition: none;
  }

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