.page-about {
  --ab-line: rgba(143, 163, 191, 0.28);
  --ab-line-soft: rgba(143, 163, 191, 0.16);
  display: block;
  padding: clamp(26px, 4vw, 48px) var(--safe) clamp(56px, 8vw, 96px);
  color: var(--text);
  font-family: var(--font-body);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about [id] {
  scroll-margin-top: calc(var(--hdr-h) + 28px);
}

/* ---------- 首屏索引头 ---------- */

.ab-head {
  position: relative;
}

.ab-head__grid {
  display: grid;
  gap: clamp(22px, 4vw, 34px);
}

.ab-head .lede {
  margin: 14px 0 0;
  max-width: 33em;
}

.ab-head__meta {
  margin: 22px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.ab-head__meta span {
  display: inline-flex;
  align-items: center;
}

.ab-head__meta span::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 10px rgba(255, 107, 0, 0.7);
}

.ab-cover {
  margin: 0;
  aspect-ratio: 3 / 2;
  border-radius: var(--radius);
}

.page-about .figure {
  overflow: hidden;
}

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

/* ---------- 横向跳转表 ---------- */

.ab-jump {
  margin-top: clamp(26px, 4vw, 38px);
  border-top: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.ab-jump ul {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 9px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.ab-jump li {
  flex: 0 0 auto;
}

.ab-jump a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--text);
  font-size: 14.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.ab-jump a:hover,
.ab-jump a:focus-visible {
  background: rgba(255, 107, 0, 0.14);
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(255, 107, 0, 0.55);
}

.ab-jump__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
  transition: color 0.25s ease;
}

.ab-jump a:hover .ab-jump__num,
.ab-jump a:focus-visible .ab-jump__num {
  color: var(--orange-2);
}

/* ---------- 右侧页内索引 ---------- */

.ab-rail {
  display: none;
}

/* ---------- 章节通用 ---------- */

.ab-sec {
  margin-top: clamp(52px, 7vw, 94px);
}

.ab-sec__head {
  max-width: 34em;
}

.ab-sec__head h2 {
  margin: 0.35em 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.24;
  color: #fff;
}

.ab-sec__body {
  margin-top: clamp(20px, 3vw, 34px);
  display: grid;
  gap: clamp(22px, 3vw, 30px);
  min-width: 0;
}

.ab-note {
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--orange);
}

.ab-note__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.ab-note__list {
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.ab-note__list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--ab-line);
}

.ab-note__list dt {
  font-size: 14px;
  color: var(--mist);
}

.ab-note__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--orange-2);
}

.ab-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 16px;
  padding: 0;
  list-style: none;
}

.ab-chips li {
  padding: 6px 13px;
  border: 1px solid var(--ab-line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--text);
}

.ab-inline-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--orange-2);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 148, 64, 0.45);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.ab-inline-link:hover,
.ab-inline-link:focus-visible {
  color: #fff;
  border-color: var(--orange);
}

/* ---------- 团队 ---------- */

.ab-team {
  padding: clamp(22px, 4vw, 42px);
}

.ab-team__head h2 {
  margin: 0.35em 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.24;
  color: var(--brown);
}

.page-about .ab-team .eyebrow {
  color: var(--brown);
}

.ab-team__lede {
  margin: 14px 0 0;
  max-width: 33em;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(42, 31, 26, 0.78);
}

.ab-team__list {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.ab-role summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  min-height: 48px;
  padding: 14px 0;
  border-top: 1px solid rgba(42, 31, 26, 0.16);
  cursor: pointer;
  list-style: none;
}

.ab-role summary::-webkit-details-marker {
  display: none;
}

.ab-role summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 6px;
}

.ab-role__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: #C24E00;
  min-width: 2.1em;
}

.ab-role__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--brown);
}

.ab-role__bar {
  flex: 1 1 110px;
  min-width: 70px;
  height: 6px;
  border-radius: 999px;
  background: rgba(42, 31, 26, 0.14);
  overflow: hidden;
}

.ab-role__bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--jade), var(--orange));
}

.ab-role__chev {
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 2px solid rgba(42, 31, 26, 0.5);
  border-bottom: 2px solid rgba(42, 31, 26, 0.5);
  transform: rotate(45deg);
  transition: transform 0.25s ease;
}

.ab-role[open] .ab-role__chev {
  transform: rotate(-135deg);
}

.ab-role__desc {
  margin: 0 0 6px;
  padding: 4px 0 14px 2.1em;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(42, 31, 26, 0.82);
}

.ab-team__figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  border-radius: var(--radius-sm);
}

/* ---------- 深色板 ---------- */

.ab-board {
  padding: clamp(22px, 4vw, 40px);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink-700), var(--ink) 82%);
  border: 1px solid var(--ab-line-soft);
}

/* ---------- 时间轴 ---------- */

.ab-tl-band {
  margin: clamp(18px, 3vw, 26px) 0 clamp(22px, 3vw, 32px);
  aspect-ratio: 7 / 3;
  border-radius: var(--radius-sm);
  opacity: 0.82;
}

.ab-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(242, 193, 78, 0.12));
}

.ab-tl__item {
  position: relative;
  padding-bottom: clamp(18px, 2.6vw, 28px);
}

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

.ab-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--orange);
  box-shadow: 0 0 16px rgba(255, 107, 0, 0.5);
}

.ab-tl__card {
  padding: 16px 18px 18px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-sm);
  background: rgba(11, 30, 58, 0.6);
  transition: border-color 0.28s ease, transform 0.28s ease, box-shadow 0.28s ease;
}

.ab-tl__card:hover {
  border-color: rgba(255, 107, 0, 0.65);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.ab-tl__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
  transition: color 0.28s ease, transform 0.28s ease;
  transform-origin: left center;
}

.ab-tl__card:hover .ab-tl__ver {
  color: var(--orange);
  transform: scale(1.08);
}

.ab-tl__title {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: #fff;
}

.ab-tl__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
  max-width: 38em;
}

/* ---------- 覆盖数据 ---------- */

.ab-stats {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-700);
}

.ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 1.9rem);
  letter-spacing: 0.02em;
  color: var(--orange-2);
}

.ab-stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 使用场景 ---------- */

.ab-scenes {
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.ab-scene {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--radius-sm);
  background: rgba(19, 41, 75, 0.55);
  transition: border-color 0.28s ease, transform 0.28s ease;
}

.ab-scene:nth-child(2) {
  border-left: 3px solid rgba(18, 184, 134, 0.6);
}

.ab-scene:nth-child(3) {
  border-left: 3px solid rgba(242, 193, 78, 0.6);
}

.ab-scene:hover {
  border-color: rgba(255, 107, 0, 0.55);
  transform: translateY(-3px);
}

.ab-scene__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 107, 0, 0.16);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 0, 0.45);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-2);
}

.ab-scene h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: #fff;
}

.ab-scene p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 合作徽记 ---------- */

.ab-badges {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: clamp(14px, 2vw, 22px);
}

.ab-badge {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 12px;
  text-align: center;
  border-radius: 50%;
  border: 1px solid var(--ab-line);
  background: radial-gradient(circle at 50% 28%, rgba(255, 107, 0, 0.14), transparent 66%);
  transition: border-color 0.28s ease, box-shadow 0.28s ease, transform 0.28s ease;
}

.ab-badge:hover {
  border-color: var(--orange);
  box-shadow: var(--glow-orange);
  transform: translateY(-3px);
}

.ab-badge__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.2vw, 1.45rem);
  letter-spacing: 0.04em;
  color: var(--gold);
}

.ab-badge__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 延伸索引 ---------- */

.ab-next h2 {
  margin: 0.35em 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.01em;
  font-size: clamp(1.4rem, 3vw, 2rem);
  color: #fff;
}

.ab-next__list {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-line);
}

.ab-next__list li {
  border-bottom: 1px solid var(--ab-line);
}

.ab-next__list a {
  display: grid;
  grid-template-columns: 46px 1fr;
  grid-template-areas:
    "idx label"
    "idx desc";
  align-items: center;
  gap: 2px 14px;
  min-height: 64px;
  padding: 14px 6px;
  text-decoration: none;
  transition: background-color 0.25s ease, padding-left 0.25s ease;
}

.ab-next__list a:hover,
.ab-next__list a:focus-visible {
  background: rgba(255, 107, 0, 0.09);
  padding-left: 14px;
}

.ab-next__idx {
  grid-area: idx;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--gold);
  transition: color 0.25s ease;
}

.ab-next__list a:hover .ab-next__idx,
.ab-next__list a:focus-visible .ab-next__idx {
  color: var(--orange);
}

.ab-next__label {
  grid-area: label;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}

.ab-next__desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 平板以上 ---------- */

@media (min-width: 760px) {
  .ab-sec__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(26px, 4vw, 48px);
  }

  .ab-sec__body--wide {
    grid-template-columns: minmax(0, 1fr);
  }

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

/* ---------- 桌面：框架式右侧索引 ---------- */

@media (min-width: 900px) {
  .page-about {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 156px;
    column-gap: clamp(30px, 4vw, 58px);
    max-width: 1180px;
    margin: 0 auto;
  }

  .page-about > section {
    grid-column: 1;
    min-width: 0;
  }

  .page-about > .ab-rail {
    display: block;
    grid-column: 2;
    grid-row: 1 / -1;
    align-self: start;
    position: sticky;
    top: calc(var(--hdr-h) + 30px);
  }

  .ab-rail__title {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--gold);
  }

  .ab-rail ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 2px;
  }

  .ab-rail a {
    display: block;
    padding: 9px 0 9px 14px;
    border-left: 2px solid var(--ab-line);
    font-size: 14px;
    color: var(--mist);
    text-decoration: none;
    transition: border-color 0.25s ease, color 0.25s ease, padding-left 0.25s ease;
  }

  .ab-rail a:hover,
  .ab-rail a:focus-visible {
    border-left-color: var(--orange);
    color: var(--orange-2);
    padding-left: 18px;
  }

  .ab-head__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.9fr);
    align-items: center;
    gap: clamp(34px, 4vw, 56px);
  }

  .ab-badges {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms;
  }
}