/* ===== 品牌文化 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  display: block;
  color: var(--ink);
  overflow-x: clip;
}

.page-about .section-title {
  max-width: 22ch;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(28px, 6.5vw, 72px) 0 clamp(28px, 5vw, 52px);
  background-image: radial-gradient(52% 66% at 12% 0%, rgba(224, 169, 75, .22), transparent 72%);
  background-repeat: no-repeat;
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(29px, 7.4vw, 60px);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 21ch;
}

.page-about .ab-hero .lede {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 40ch;
  font-size: clamp(15px, 2.6vw, 17px);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.page-about .ab-figures > div {
  background: var(--paper-2);
  padding: 15px 16px;
}

.page-about .ab-figures dt {
  margin: 0;
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .ab-figures dd {
  margin: 8px 0 0;
  font-size: clamp(19px, 4.6vw, 27px);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--purple-deep);
}

/* ---------- 时间线 ---------- */

.page-about .ab-tl {
  padding: clamp(22px, 4.5vw, 44px) 0 clamp(28px, 5vw, 56px);
}

.page-about .ab-tl-grid {
  display: grid;
  gap: 30px;
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .ab-tl-list {
  list-style: none;
  margin: 4px 0 0 5px;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line-strong);
}

.page-about .ab-tl-item {
  position: relative;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -26.5px;
  top: 21px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper);
  transition: background 180ms var(--ease);
}

.page-about .ab-tl-item:has(.ab-tl-btn[aria-expanded="true"])::before {
  background: var(--purple);
}

.page-about .ab-tl-btn {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 14px;
  width: 100%;
  margin: 0;
  padding: 11px 8px 11px 0;
  background: none;
  border: 0;
  border-radius: 8px;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: inherit;
  transition: color 180ms var(--ease);
}

.page-about .ab-tl-btn:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(59, 31, 82, .22);
}

.page-about .ab-tl-year {
  font-family: var(--font-meta);
  font-variant-numeric: tabular-nums;
  font-size: clamp(21px, 4.4vw, 27px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--purple-deep);
  transition: color 180ms var(--ease);
}

.page-about .ab-tl-name {
  font-size: clamp(15px, 2.6vw, 17px);
  font-weight: 600;
  color: var(--ink-soft);
}

.page-about .ab-tl-btn::after {
  content: "+";
  font-family: var(--font-meta);
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
  transition: transform 180ms var(--ease), color 180ms var(--ease);
}

.page-about .ab-tl-btn:hover .ab-tl-year,
.page-about .ab-tl-btn[aria-expanded="true"] .ab-tl-year {
  color: var(--purple);
}

.page-about .ab-tl-btn:hover::after {
  color: var(--purple);
}

.page-about .ab-tl-btn[aria-expanded="true"]::after {
  transform: rotate(45deg);
}

.page-about .ab-tl-panel {
  padding: 0 0 14px;
}

.page-about .ab-tl-panel[hidden] {
  display: none;
}

.page-about .ab-tl-panel p {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .ab-tl-figure {
  margin: 0;
}

.page-about .ab-tl-figure .media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--paper-2);
}

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

.page-about .ab-tl-figure .media-cap {
  margin-top: 10px;
}

/* ---------- 牌型组合这条线 ---------- */

.page-about .ab-track--pair {
  position: relative;
  padding: clamp(34px, 6vw, 68px) 0;
}

.page-about .ab-track--pair::before,
.page-about .ab-track--pair::after {
  content: "";
  position: absolute;
  top: 0;
  height: 3px;
}

.page-about .ab-track--pair::before {
  left: 0;
  width: 58%;
  background: var(--purple-deep);
}

.page-about .ab-track--pair::after {
  right: 0;
  width: 26%;
  background: var(--gold);
}

.page-about .ab-pair-grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-pair-main p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 38ch;
}

.page-about .ab-pair-side {
  align-self: start;
  padding: 20px 20px 22px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-1);
}

.page-about .ab-side-kicker {
  margin: 0 0 14px;
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .ab-pair-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-pair-tags li {
  padding: 6px 13px;
  border-radius: var(--pill);
  background: rgba(109, 63, 168, .1);
  border: 1px solid rgba(109, 63, 168, .22);
  color: var(--purple-deep);
  font-size: 13px;
  font-weight: 600;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-pair-tags li:hover {
  background: rgba(109, 63, 168, .2);
  border-color: var(--purple);
}

.page-about .ab-side-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 残局练习这条线 ---------- */

.page-about .ab-track--endgame {
  margin: clamp(12px, 3vw, 28px) 0 clamp(34px, 6vw, 68px);
  padding: clamp(36px, 6vw, 84px) clamp(20px, 4.5vw, 62px);
  border-radius: 18px;
  background: var(--green);
  color: var(--paper);
}

.page-about .ab-track--endgame .eyebrow {
  color: var(--gold);
}

.page-about .ab-track--endgame .section-title {
  color: var(--paper);
  margin-top: 12px;
}

.page-about .ab-end-lede {
  margin: 16px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(246, 241, 228, .78);
}

.page-about .ab-end-list {
  list-style: none;
  display: grid;
  gap: 20px;
  margin: clamp(26px, 4.5vw, 40px) 0 0;
  padding: 0;
}

.page-about .ab-end-list li {
  padding-top: 16px;
  border-top: 1px solid rgba(246, 241, 228, .22);
}

.page-about .ab-end-list strong {
  display: block;
  margin-bottom: 9px;
  font-family: var(--font-meta);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--neon);
}

.page-about .ab-end-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 241, 228, .78);
}

/* ---------- 校准节奏 ---------- */

.page-about .ab-cadence {
  display: grid;
  gap: 24px;
  margin: 0 0 clamp(34px, 6vw, 68px);
  padding: clamp(26px, 4.5vw, 48px) clamp(20px, 4vw, 46px);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow-1);
}

.page-about .ab-cadence-num {
  display: block;
  font-family: var(--font-meta);
  font-variant-numeric: tabular-nums;
  font-size: clamp(64px, 17vw, 132px);
  line-height: .86;
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--purple-deep);
}

.page-about .ab-cadence-unit {
  display: block;
  margin-top: 12px;
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--muted);
}

.page-about .ab-cadence-body p {
  margin: 16px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  padding: 0 0 clamp(34px, 6vw, 68px);
}

.page-about .ab-team-photo {
  margin: clamp(22px, 4vw, 36px) 0 0;
}

.page-about .ab-team-photo .media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--paper-2);
  box-shadow: var(--shadow-1);
}

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

.page-about .ab-team-photo .media-cap {
  margin-top: 10px;
}

.page-about .ab-team-cards {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4.5vw, 42px);
}

.page-about .ab-team-card {
  padding: 22px 20px 24px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-1);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .ab-team-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: var(--line-strong);
}

.page-about .ab-team-num {
  margin: 0;
  font-family: var(--font-meta);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 8vw, 54px);
  line-height: 1;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--purple);
}

.page-about .ab-team-kicker {
  margin: 0;
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .ab-team-card h3 {
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-team-card p:last-child {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 34ch;
}

/* ---------- 本地共建 ---------- */

.page-about .ab-local {
  margin: 0 0 clamp(34px, 6vw, 68px);
  border-radius: 18px;
  background: var(--purple-deep);
  color: var(--paper);
  overflow: hidden;
}

.page-about .ab-local-inner {
  display: grid;
  gap: 0;
}

.page-about .ab-local-text {
  padding: clamp(30px, 5.5vw, 68px) clamp(20px, 4.5vw, 62px);
}

.page-about .ab-local .eyebrow {
  color: var(--gold);
}

.page-about .ab-local .section-title {
  color: var(--paper);
  margin-top: 12px;
}

.page-about .ab-local-text > p {
  margin: 16px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(246, 241, 228, .78);
}

.page-about .ab-local-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 22px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(246, 241, 228, .22);
}

.page-about .ab-local-facts dt {
  margin: 0;
  font-family: var(--font-meta);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(246, 241, 228, .6);
}

.page-about .ab-local-facts dd {
  margin: 7px 0 0;
  font-size: clamp(19px, 4.4vw, 25px);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--neon);
}

.page-about .ab-local-photo {
  margin: 0;
  align-self: stretch;
}

.page-about .ab-local-photo .media {
  margin: 0;
  height: 100%;
}

.page-about .ab-local-photo .media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

/* ---------- 收束 ---------- */

.page-about .ab-cta {
  padding: clamp(30px, 5.5vw, 64px) clamp(22px, 4vw, 52px);
  border: 1px solid var(--line);
  border-left: 4px solid var(--gold);
  border-radius: 14px;
  background: var(--paper-2);
  box-shadow: var(--shadow-1);
}

.page-about .ab-cta p {
  margin: 16px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-cta .btn-row {
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .ab-cta .btn:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-figures > div {
    padding: 20px 22px;
  }

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

  .page-about .ab-team-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-team-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .ab-team-card:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .ab-local-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-tl-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-tl-figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .ab-pair-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 54px;
    align-items: start;
  }

  .page-about .ab-cadence {
    grid-template-columns: minmax(0, .4fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .ab-local-inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: stretch;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero {
    padding-bottom: clamp(46px, 5vw, 64px);
  }

  .page-about .ab-pair-main p {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team-card,
  .page-about .ab-tl-btn,
  .page-about .ab-tl-btn::after,
  .page-about .ab-tl-year,
  .page-about .ab-pair-tags li {
    transition: none;
  }

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