.page-about {
  --ab-cut: 14px;
  --ab-rail: 2px;
  background: var(--cream-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .ab-eyebrow,
.page-about .ab-sec-index,
.page-about .ab-hero-num,
.page-about .ab-phase-years,
.page-about .ab-flow-num,
.page-about .ab-flow-meta,
.page-about .ab-pair-tag,
.page-about .ab-rule-num {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-900);
  color: var(--cream-100);
  padding: clamp(28px, 5vw, 56px) 0 clamp(64px, 9vw, 120px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(244, 239, 230, 0.055) 0 1px,
    transparent 1px 15px
  );
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(24px, 4vw, 44px);
  background: var(--cream-100);
  clip-path: polygon(0 100%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 2;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  color: var(--gold-500);
  text-transform: uppercase;
}

.page-about .ab-hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 96px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .ab-hero-em {
  display: inline-block;
  color: var(--flame-500);
  transform: skewX(-6deg);
  transform-origin: left bottom;
}

.page-about .ab-hero-lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 40ch;
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.82);
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 22px;
  margin-top: clamp(24px, 3.4vw, 34px);
}

.page-about .ab-hero-actions .link-more {
  color: var(--cream-100);
  font-size: 15px;
}

.page-about .ab-hero-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(244, 239, 230, 0.18);
  border-left: 1px solid rgba(244, 239, 230, 0.18);
  align-self: end;
}

.page-about .ab-hero-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  border-right: 1px solid rgba(244, 239, 230, 0.18);
  border-bottom: 1px solid rgba(244, 239, 230, 0.18);
}

.page-about .ab-hero-num {
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime-400);
}

.page-about .ab-hero-label {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(244, 239, 230, 0.72);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  padding: clamp(52px, 8vw, 104px) 0;
}

.page-about .ab-sec--ink {
  background: var(--ink-900);
  color: var(--cream-100);
}

.page-about .ab-sec-head {
  max-width: 44ch;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-sec-index {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--flame-700);
}

.page-about .ab-sec--ink .ab-sec-index {
  color: var(--gold-500);
}

.page-about .ab-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 48px);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .ab-sec-title--ink {
  color: var(--cream-100);
}

.page-about .ab-sec-lede {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-500);
}

.page-about .ab-sec--ink .ab-sec-lede {
  color: rgba(244, 239, 230, 0.72);
}

/* ---------- 品牌主张 ---------- */
.page-about .ab-claim {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 52px);
}

.page-about .ab-claim-body {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
}

.page-about .ab-claim-text {
  margin: 0;
  max-width: 36ch;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .ab-quote {
  margin: 0;
  padding: 6px 0 6px clamp(16px, 2.6vw, 26px);
  border-left: 4px solid var(--clay-400);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 3vw, 32px);
  line-height: 1.34;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

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

.page-about .ab-claim-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--graphite-700);
}

.page-about .ab-claim-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--flame-500);
}

/* ---------- 双版本 ---------- */
.page-about .ab-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .ab-pair-card {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: var(--graphite-700);
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
  transition: transform 0.3s var(--ease);
}

.page-about .ab-pair-card--steady {
  background: #211d1a;
  box-shadow: inset 3px 0 0 var(--moss-600);
}

.page-about .ab-pair-card:hover {
  transform: translateY(-2px);
}

.page-about .ab-pair-tag {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--lime-400);
}

.page-about .ab-pair-card--steady .ab-pair-tag {
  color: var(--gold-500);
}

.page-about .ab-pair-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.3;
  color: var(--cream-100);
}

.page-about .ab-pair-text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.78);
}

.page-about .ab-pair-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  border-top: 1px solid rgba(244, 239, 230, 0.14);
  padding-top: 16px;
}

.page-about .ab-pair-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.86);
}

.page-about .ab-pair-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--flame-500);
}

.page-about .ab-pair-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(244, 239, 230, 0.16);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.66);
}

/* ---------- 四道工序 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--gray-200);
  border: 1px solid var(--gray-200);
}

.page-about .ab-flow-step {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px) clamp(16px, 2.2vw, 22px);
  background: var(--cream-050);
  outline: none;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .ab-flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gray-200);
  transition: background 0.3s var(--ease);
}

.page-about .ab-flow-step:hover,
.page-about .ab-flow-step:focus-within {
  background: #fff;
  box-shadow: var(--lift);
}

.page-about .ab-flow-step:hover::before,
.page-about .ab-flow-step:focus-within::before {
  background: var(--flame-500);
}

.page-about .ab-flow-num {
  display: block;
  font-size: 12px;
  color: var(--flame-700);
}

.page-about .ab-flow-title {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.3;
}

.page-about .ab-flow-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite-700);
}

.page-about .ab-flow-meta {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--gray-500);
  opacity: 0.85;
  transition: color 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-about .ab-flow-step:hover .ab-flow-meta,
.page-about .ab-flow-step:focus-within .ab-flow-meta {
  opacity: 1;
  color: var(--flame-700);
}

.page-about .ab-media {
  margin: 0;
}

.page-about .ab-media .media-frame {
  display: block;
  width: 100%;
}

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

.page-about .ab-media .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray-500);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  padding-left: 30px;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-rail {
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: var(--ab-rail);
  background: linear-gradient(
    180deg,
    var(--flame-500) 0%,
    var(--gold-500) 55%,
    var(--gray-200) 100%
  );
}

.page-about .ab-phase {
  position: relative;
}

.page-about .ab-node {
  position: absolute;
  left: -30px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--cream-100);
  border: 3px solid var(--flame-500);
  box-sizing: border-box;
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.page-about .ab-phase:hover .ab-node,
.page-about .ab-phase:focus-within .ab-node {
  transform: scale(1.35);
  box-shadow: 0 0 0 7px rgba(232, 69, 31, 0.14);
}

.page-about .ab-phase-years {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--flame-700);
}

.page-about .ab-phase-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 27px);
  line-height: 1.25;
}

.page-about .ab-phase-body p {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite-700);
}

.page-about .ab-media--phase {
  margin-top: 18px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-team-text {
  margin: 16px 0 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.78);
}

.page-about .ab-team-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(244, 239, 230, 0.14);
  border-top: 1px solid rgba(244, 239, 230, 0.14);
  border-bottom: 1px solid rgba(244, 239, 230, 0.14);
}

.page-about .ab-team-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 13px 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 239, 230, 0.86);
  background: var(--ink-900);
}

.page-about .ab-team-list .mono {
  min-width: 84px;
  font-size: 12px;
  color: var(--lime-400);
}

.page-about .ab-media--team {
  align-self: start;
}

.page-about .ab-media--team .media-caption {
  color: rgba(244, 239, 230, 0.6);
}

/* ---------- 工作准则 ---------- */
.page-about .ab-rules {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .ab-rule {
  position: relative;
  padding: clamp(20px, 2.8vw, 28px);
  background: var(--cream-050);
  border: var(--hair);
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
}

.page-about .ab-rule-num {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--clay-400);
}

.page-about .ab-rule-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.3;
}

.page-about .ab-rule-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite-700);
}

.page-about .ab-cta {
  margin-top: clamp(28px, 4vw, 42px);
  padding: clamp(22px, 3vw, 34px);
  background: var(--ink-900);
  color: var(--cream-100);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  clip-path: polygon(0 0, calc(100% - var(--ab-cut)) 0, 100% var(--ab-cut), 100% 100%, 0 100%);
}

.page-about .ab-cta-text {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.84);
}

.page-about .ab-cta .btn-ghost {
  border-color: var(--flame-500);
  color: var(--cream-100);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.9fr);
    align-items: end;
  }

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

  .page-about .ab-claim {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

  .page-about .ab-claim .ab-sec-head {
    margin-bottom: 0;
    position: sticky;
    top: 96px;
  }

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

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

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

  .page-about .ab-phase-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .ab-media--phase {
    margin-top: 22px;
    max-width: 720px;
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-rail {
    left: 10px;
  }

  .page-about .ab-phase-years {
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-pair-card,
  .page-about .ab-node,
  .page-about .ab-flow-step,
  .page-about .ab-flow-meta {
    transition: none;
  }

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

  .page-about .ab-phase:hover .ab-node {
    transform: none;
  }
}
</main>