.page-about {
  --ab-line: 6px;
  --ab-pad-y: 30px;
  display: block;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 首屏拼贴 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 22px 0 34px;
  background:
    radial-gradient(120% 88% at 92% 2%, rgba(139, 92, 246, .30), transparent 58%),
    radial-gradient(86% 70% at 0% 100%, rgba(59, 242, 226, .10), transparent 62%),
    var(--ink);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.page-about .ab-hero__main {
  padding-left: 16px;
  border-left: 4px solid var(--cyan);
}

.page-about .ab-hero__main .eyebrow {
  display: block;
  margin: 0 0 10px;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .12em;
}

.page-about .ab-hero h1 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(30px, 7.4vw, 46px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  margin: 0 0 20px;
  max-width: 46ch;
  font-size: 17px;
  line-height: 1.78;
  color: #C6D3EC;
}

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

.page-about .ab-hero__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-stat {
  padding: 14px 14px 16px;
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(21, 27, 74, .92), rgba(6, 9, 18, .72));
  border: 1px solid var(--hair);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-stat:hover {
  transform: translateY(-3px);
  border-color: rgba(59, 242, 226, .55);
}

.page-about .ab-stat__num {
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-size: 28px;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-stat__unit {
  font-size: 14px;
  color: var(--muted);
}

.page-about .ab-stat__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .ab-hero__strip {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--r-md) var(--r-lg) var(--r-md) var(--r-lg);
  background: linear-gradient(100deg, rgba(6, 48, 46, .92), rgba(21, 27, 74, .45));
  border-left: 3px solid var(--orange);
  font-size: 15px;
  line-height: 1.6;
  color: #BCC9E4;
}

.page-about .ab-hero__dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, .16);
}

/* ---------- 连续画布与时间线 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: var(--ab-pad-y) 0;
}

.page-about .ab-chapter__grid {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-about .ab-chapter__idx {
  position: relative;
  align-self: stretch;
  min-height: 64px;
  padding-top: 8px;
}

.page-about .ab-chapter__idx::before {
  content: "";
  position: absolute;
  left: var(--ab-line);
  top: 0;
  width: 1px;
  height: calc(100% + 76px);
  background: linear-gradient(180deg, var(--hair), var(--hair) 62%, rgba(35, 46, 77, 0));
}

.page-about .ab-chapter--end .ab-chapter__idx::before {
  height: 100%;
  background: linear-gradient(180deg, var(--hair), rgba(35, 46, 77, 0));
}

.page-about .ab-chapter__idx::after {
  content: "";
  position: absolute;
  left: calc(var(--ab-line) - 4.5px);
  top: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, .12);
}

.page-about .ab-num {
  display: block;
  margin-top: 36px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .ab-slab {
  padding: 24px 18px 26px;
  border-radius: 34px 18px 34px 18px;
  background: linear-gradient(155deg, rgba(21, 27, 74, .58), rgba(6, 9, 18, .34));
}

.page-about .ab-chapter--indigo .ab-slab {
  background: linear-gradient(155deg, #1E2668, #101538 78%);
}

.page-about .ab-chapter--wine .ab-slab {
  background: linear-gradient(155deg, #541834, #290A1A 80%);
}

.page-about .ab-chapter--teal .ab-slab {
  background: linear-gradient(155deg, #08433F, #04201F 80%);
}

.page-about .ab-h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 25px;
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .ab-p {
  margin: 0 0 14px;
  font-size: 16.5px;
  line-height: 1.78;
  color: #CBD7EE;
}

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

.page-about .ab-list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-list li {
  padding: 13px 0 13px 16px;
  border-top: 1px solid var(--hair);
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-list li:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-list li strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-list--tight li {
  border-top-color: rgba(35, 46, 77, .8);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 18px 0 0;
  font-size: 15px;
}

.page-about .ab-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 242, 226, .45);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-links a:hover {
  color: var(--paper);
  border-color: var(--paper);
}

/* 图片容器 */
.page-about .ab-figure {
  margin: 0 0 22px;
  border-radius: 22px 10px 22px 10px;
  overflow: hidden;
  background: rgba(6, 9, 18, .55);
}

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

.page-about .ab-figure--tall {
  margin: 0;
  border-radius: 24px 10px 24px 10px;
}

/* 横向时间线 */
.page-about .ab-tl {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .ab-tl__item {
  position: relative;
  padding: 18px 0 0 16px;
  border-top: 1px solid rgba(59, 242, 226, .22);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: -5.5px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .14);
}

.page-about .ab-tl__tag {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .ab-duo {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .ab-roles {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-role {
  padding: 14px 16px 16px;
  border-radius: var(--r-md);
  background: rgba(6, 9, 18, .34);
  border-left: 3px solid var(--orange);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  border-left-color: var(--cyan);
  background: rgba(6, 9, 18, .62);
  transform: translateY(-3px);
}

.page-about .ab-role__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-partner {
  padding: 16px 16px 18px;
  border-radius: 20px 8px 20px 8px;
  background: rgba(6, 9, 18, .40);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-partner:hover,
.page-about .ab-partner:focus-within {
  transform: translateY(-3px);
  background: rgba(6, 9, 18, .68);
}

.page-about .ab-partner__n {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-partner__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-partner__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 区域 ---------- */
.page-about .ab-cover {
  overflow: hidden;
  border-radius: 34px 18px 34px 18px;
  background: linear-gradient(168deg, var(--indigo), var(--ink) 76%);
}

.page-about .ab-cover__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: .72;
}

.page-about .ab-cover__body {
  position: relative;
  margin-top: -26px;
  padding: 22px 18px 26px;
  background: linear-gradient(180deg, rgba(6, 9, 18, 0), rgba(6, 9, 18, .88) 34%, rgba(6, 9, 18, .94));
}

.page-about .ab-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 收尾 ---------- */
.page-about .ab-slab--cta {
  background: linear-gradient(150deg, #1B2260, #0A0F26 82%);
}

.page-about .ab-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

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

/* ---------- 平板与桌面 ---------- */
@media (min-width: 700px) {
  .page-about {
    --ab-pad-y: 40px;
  }

  .page-about .ab-chapter__grid {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .ab-slab {
    padding: 32px 30px 34px;
  }

  .page-about .ab-h2 {
    font-size: 30px;
  }

  .page-about .ab-tl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }

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

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

  .page-about .ab-cover__body {
    padding: 26px 30px 32px;
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-hero {
    padding: 30px 0 42px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    grid-template-areas:
      "main side"
      "strip strip";
    gap: 26px 36px;
    margin-top: 26px;
  }

  .page-about .ab-hero__main {
    grid-area: main;
    padding-left: 22px;
  }

  .page-about .ab-hero__side {
    grid-area: side;
  }

  .page-about .ab-hero__strip {
    grid-area: strip;
  }

  .page-about .ab-chapter__grid {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .ab-slab {
    padding: 40px 44px 44px;
  }

  .page-about .ab-h2 {
    font-size: 34px;
  }

  .page-about .ab-p {
    font-size: 17px;
    max-width: 62ch;
  }

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

  .page-about .ab-duo {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

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

  .page-about .ab-role--wide {
    grid-column: span 2;
  }
}

@media (min-width: 1240px) {
  .page-about .ab-hero h1 {
    font-size: 48px;
  }

  .page-about .ab-tl__text {
    font-size: 15.5px;
  }
}

/* 阅读进度驱动的节点点亮，仅在支持滚动驱动动画时生效 */
@keyframes ab-node-in {
  from {
    opacity: .28;
    transform: scale(.68);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .page-about .ab-chapter__idx::after {
      animation: ab-node-in linear both;
      animation-timeline: view();
      animation-range: entry 8% cover 34%;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-stat,
  .page-about .ab-role,
  .page-about .ab-partner {
    transition: none;
  }
}
</main>