.page-about {
  --ab-line: var(--mk-line);
  --ab-line-strong: var(--mk-line-strong);
  background: var(--mk-bg);
  color: var(--mk-paper);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .ab-crumbs {
  padding-top: 18px;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  margin-top: 18px;
  border: 1px solid var(--ab-line);
  background: var(--mk-night);
  padding: 12px 12px 14px;
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-family: var(--mk-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mk-muted);
  text-transform: uppercase;
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-index__list li {
  flex: 0 0 auto;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid transparent;
  color: var(--mk-silver);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  border-color: var(--mk-lime);
  color: var(--mk-lime);
  background: rgba(198, 255, 61, 0.06);
}

.page-about .ab-index__no {
  font-family: var(--mk-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mk-muted);
}

.page-about .ab-index__link:hover .ab-index__no,
.page-about .ab-index__link:focus-visible .ab-index__no {
  color: var(--mk-lime);
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  position: relative;
  margin-top: 16px;
  padding: clamp(22px, 4vw, 54px);
  border: 1px solid var(--ab-line-strong);
  background:
    radial-gradient(120% 92% at 88% -6%, rgba(198, 255, 61, 0.13), transparent 58%),
    linear-gradient(202deg, var(--mk-panel), var(--mk-bg) 66%);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(185, 196, 192, 0.075) 0 1px, transparent 1px 74px),
    repeating-linear-gradient(0deg, rgba(185, 196, 192, 0.05) 0 1px, transparent 1px 74px);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 76%);
  mask-image: linear-gradient(180deg, #000, transparent 76%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 88px;
  height: 88px;
  pointer-events: none;
  background:
    linear-gradient(var(--mk-lime), var(--mk-lime)) right top / 2px 22px no-repeat,
    linear-gradient(var(--mk-lime), var(--mk-lime)) right top / 22px 2px no-repeat,
    linear-gradient(var(--mk-orange), var(--mk-orange)) right 10px top 10px / 1px 12px no-repeat;
}

.page-about .ab-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--mk-display);
  font-weight: 900;
  font-size: clamp(30px, 5.8vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--mk-paper);
  max-width: 17ch;
}

.page-about .ab-hero__lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mk-silver);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-hero__stat {
  background: rgba(7, 19, 15, 0.72);
  padding: 14px 12px;
}

.page-about .ab-hero__num {
  display: block;
  font-family: var(--mk-mono);
  font-size: clamp(18px, 3.6vw, 28px);
  line-height: 1;
  color: var(--mk-lime);
  letter-spacing: 0.02em;
}

.page-about .ab-hero__cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--mk-muted);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  border-top: 1px solid var(--ab-line);
  padding-block: clamp(34px, 5.4vw, 72px);
}

.page-about .ab-sec__head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: clamp(16px, 2.6vw, 28px);
}

.page-about .ab-sec__no {
  flex: 0 0 auto;
  font-family: var(--mk-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mk-lime);
  padding-top: 0.55em;
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--mk-display);
  font-weight: 800;
  font-size: clamp(21px, 3.2vw, 34px);
  line-height: 1.22;
  color: var(--mk-paper);
}

.page-about .ab-h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--mk-paper);
}

.page-about .ab-lede {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--mk-silver);
}

.page-about .ab-split__body p {
  margin: 0 0 16px;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--mk-silver);
}

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

.page-about .ab-split {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
}

.page-about .ab-note-line {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--mk-lime);
  background: rgba(16, 43, 36, 0.62);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mk-silver);
}

/* ---------- 图片 ---------- */
.page-about .ab-fig {
  margin: 0;
  border: 1px solid var(--ab-line);
  background: var(--mk-panel);
  box-shadow: var(--mk-shadow);
}

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

.page-about .ab-fig__cap {
  display: block;
  padding: 10px 12px;
  border-top: 1px solid var(--ab-line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mk-muted);
}

/* ---------- 四段式路线 ---------- */
.page-about .ab-route {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-route__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--ab-line);
  background: rgba(16, 43, 36, 0.5);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .ab-route__item:hover {
  border-color: var(--mk-lime);
  transform: translateY(-2px);
}

.page-about .ab-route__no {
  font-family: var(--mk-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mk-orange);
  padding-top: 2px;
}

.page-about .ab-route__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mk-silver);
}

/* ---------- 项目图例 ---------- */
.page-about .ab-legend {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-legend__item {
  font-family: var(--mk-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 6px 11px;
  border: 1px solid var(--ab-line-strong);
  background: rgba(7, 19, 15, 0.7);
  color: var(--mk-silver);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .ab-legend__item:hover {
  border-color: var(--mk-lime);
  color: var(--mk-lime);
}

.page-about .ab-legend__item--more {
  border-style: dashed;
  color: var(--mk-muted);
}

/* ---------- 三审坐标列表 ---------- */
.page-about .ab-audit {
  list-style: none;
  counter-reset: ab-audit;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-audit li {
  counter-increment: ab-audit;
  position: relative;
  padding: 14px 16px 14px 52px;
  border: 1px solid var(--ab-line);
  background: rgba(7, 19, 15, 0.6);
}

.page-about .ab-audit li::before {
  content: "0" counter(ab-audit);
  position: absolute;
  left: 16px;
  top: 15px;
  font-family: var(--mk-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mk-lime);
}

.page-about .ab-audit li::after {
  content: "";
  position: absolute;
  left: 34px;
  top: 15px;
  bottom: 15px;
  width: 1px;
  background: var(--ab-line-strong);
}

.page-about .ab-audit li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mk-silver);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-tl__node {
  position: relative;
  background: var(--mk-panel);
  padding: 24px 16px 20px;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-tl__node::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  width: 20px;
  height: 2px;
  background: var(--mk-lime);
}

.page-about .ab-tl__node::after {
  content: "";
  position: absolute;
  left: 16px;
  top: 12px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--mk-muted);
}

.page-about .ab-tl__node:hover {
  background: #0e2620;
  box-shadow: inset 0 0 0 1px var(--mk-lime-dim);
}

.page-about .ab-tl__node:hover::after {
  background: var(--mk-lime);
}

.page-about .ab-tl__ver {
  display: block;
  font-family: var(--mk-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mk-orange);
}

.page-about .ab-tl__year {
  display: block;
  margin-top: 6px;
  font-family: var(--mk-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  color: var(--mk-paper);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.page-about .ab-tl__node:hover .ab-tl__year {
  color: var(--mk-lime);
}

.page-about .ab-tl__text {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mk-silver);
}

/* ---------- 比分牌数据 ---------- */
.page-about .ab-board {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}

.page-about .ab-board__cell {
  background: var(--mk-panel);
  padding: 18px 14px;
}

.page-about .ab-board__cell--hot {
  background: var(--mk-lime);
}

.page-about .ab-board__num {
  display: block;
  font-family: var(--mk-mono);
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  color: var(--mk-lime);
  letter-spacing: 0.01em;
}

.page-about .ab-board__unit {
  font-size: 0.5em;
  margin-left: 2px;
}

.page-about .ab-board__cell--hot .ab-board__num {
  color: var(--mk-ink);
}

.page-about .ab-board__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mk-muted);
}

.page-about .ab-board__cell--hot .ab-board__label {
  color: rgba(5, 10, 8, 0.74);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-beat {
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  margin-top: 16px;
}

.page-about .ab-beat__item {
  background: rgba(7, 19, 15, 0.55);
  padding: 18px 16px;
}

.page-about .ab-beat__time {
  display: inline-block;
  font-family: var(--mk-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--mk-orange);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 138, 61, 0.32);
  margin-bottom: 10px;
}

.page-about .ab-beat__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mk-silver);
}

/* ---------- 选择理由 ---------- */
.page-about .ab-why {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-why li {
  border-left: 2px solid var(--mk-lime);
  padding: 2px 0 2px 16px;
}

.page-about .ab-why b {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--mk-paper);
}

.page-about .ab-why span {
  display: block;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mk-silver);
}

/* ---------- 行动区 ---------- */
.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 34px);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .ab-board {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-beat {
    grid-template-columns: 1fr 1fr;
  }

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

@media (min-width: 860px) {
  .page-about .ab-split {
    grid-template-columns: 1.02fr 0.98fr;
    align-items: start;
  }

  .page-about .ab-split--rev {
    grid-template-columns: 0.96fr 1.04fr;
  }

  .page-about .ab-split--rev .ab-fig {
    order: 0;
  }

  .page-about .ab-tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .ab-shell {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 58px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: calc(var(--mk-sticky-top) + 16px);
    margin-top: 16px;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
  }

  .page-about .ab-index__list li {
    width: 100%;
  }

  .page-about .ab-index__link {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-route__item,
  .page-about .ab-tl__node,
  .page-about .ab-index__link,
  .page-about .ab-legend__item {
    transition: none;
  }

  .page-about .ab-route__item:hover {
    transform: none;
  }
}
<<<END>>>