.page-about {
  --ab-gap: clamp(14px, 2vw, 24px);
  --ab-line-soft: rgba(127, 216, 245, 0.22);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: clip;
  background:
    radial-gradient(120% 120% at 88% -12%, rgba(127, 216, 245, 0.20), transparent 62%),
    linear-gradient(158deg, var(--ice-deep) 0%, var(--ice-steel) 100%);
  color: var(--ice-white);
  padding-block: clamp(22px, 3.6vw, 38px) clamp(42px, 7vw, 88px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -34%;
  width: min(520px, 72%);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle, rgba(255, 106, 26, 0.20), transparent 68%);
  pointer-events: none;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3.4vw, 36px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(234, 246, 251, 0.55);
}

.page-about .ab-crumb a {
  color: var(--ice-blue);
  text-decoration: none;
}

.page-about .ab-crumb a:hover {
  text-decoration: underline;
}

.page-about .ab-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ice-blue);
}

.page-about .ab-eyebrow--ink {
  color: var(--flare-ink);
}

.page-about .ab-eyebrow__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 20px;
  padding: 0 7px;
  border: 1px solid currentColor;
  border-radius: var(--r-pill);
  font-size: 11px;
  opacity: 0.85;
}

.page-about .ab-h1 {
  margin: 0 0 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 68px);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.01em;
}

.page-about .ab-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.78;
  color: rgba(234, 246, 251, 0.86);
}

.page-about .ab-keys {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .ab-key {
  position: relative;
  padding: 18px 20px 20px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r-soft);
  background: rgba(7, 26, 34, 0.5);
}

.page-about .ab-key__idx {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--flare);
}

.page-about .ab-key__t {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ice-white);
}

.page-about .ab-key__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(234, 246, 251, 0.72);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-sec {
  padding-block: var(--pad-block);
}

.page-about .ab-sec--light {
  background: var(--ice-white);
  color: var(--ink);
}

.page-about .ab-sec--dark {
  background: var(--ice-deep);
  color: var(--ice-white);
}

.page-about .ab-head {
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.6vw, 46px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .ab-sub {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .ab-sec--dark .ab-sub {
  color: rgba(234, 246, 251, 0.68);
}

/* ---------- 错位分栏 ---------- */
.page-about .ab-split {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  grid-template-columns: 1fr;
}

.page-about .ab-side {
  padding: 22px 22px 24px;
  border-radius: var(--r-card);
  background: linear-gradient(180deg, rgba(28, 107, 85, 0.10), rgba(127, 216, 245, 0.14));
  border-left: 3px solid var(--grass);
}

.page-about .ab-side__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--pine);
}

.page-about .ab-side__label {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .ab-side__line {
  display: block;
  height: 1px;
  margin: 20px 0;
  background: rgba(91, 118, 131, 0.35);
}

.page-about .ab-prose p {
  margin: 0 0 1.05em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
}

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

.page-about .ab-prose--dark p {
  color: rgba(234, 246, 251, 0.86);
}

.page-about .ab-prose a,
.page-about .ab-note a,
.page-about .ab-eco__text a,
.page-about .ab-era-note a {
  color: var(--flare-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-sec--dark .ab-prose a,
.page-about .ab-era-note a {
  color: var(--flare-soft);
}

/* ---------- 数据体系 ---------- */
.page-about .ab-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.page-about .ab-metrics__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  border-radius: var(--r-soft);
  background: var(--ice-steel);
  border-left: 3px solid var(--flare);
}

.page-about .ab-metrics__n {
  font-family: var(--font-mono);
  font-size: 24px;
  font-variant-numeric: tabular-nums;
  color: var(--ice-blue);
  line-height: 1.1;
}

.page-about .ab-metrics__l {
  font-size: 14px;
  line-height: 1.62;
  color: rgba(234, 246, 251, 0.78);
}

.page-about .ab-figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
}

.page-about .ab-figure--info {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-card);
  object-fit: cover;
  background: var(--ice-steel);
}

.page-about .ab-cap {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(234, 246, 251, 0.58);
}

.page-about .ab-sec--light .ab-cap {
  color: var(--steel);
}

.page-about .ab-flow {
  list-style: none;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .ab-flow__step {
  padding: 20px 20px 22px;
  border-radius: var(--r-soft);
  border: 1px solid var(--ab-line-soft);
  background: rgba(14, 46, 60, 0.62);
}

.page-about .ab-flow__n {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--flare);
}

.page-about .ab-flow__t {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ice-white);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(234, 246, 251, 0.74);
}

/* ---------- 七类标签 ---------- */
.page-about .ab-tags {
  display: grid;
  gap: 10px;
  max-width: 940px;
}

.page-about .ab-tag {
  border: 1px solid rgba(14, 59, 51, 0.16);
  border-radius: var(--r-soft);
  background: #ffffff;
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .ab-tag[open] {
  border-color: rgba(255, 106, 26, 0.6);
  box-shadow: 0 12px 30px rgba(7, 26, 34, 0.10);
}

.page-about .ab-tag__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-tag__head::-webkit-details-marker {
  display: none;
}

.page-about .ab-tag__head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--flare-ink);
}

.page-about .ab-tag[open] .ab-tag__head::after {
  content: "−";
}

.page-about .ab-tag__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .ab-tag__name {
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-tag__hint {
  grid-column: 2 / 3;
  font-size: 13px;
  color: var(--steel);
}

.page-about .ab-tag__body {
  padding: 0 18px 18px 18px;
}

.page-about .ab-tag__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #24404a;
}

.page-about .ab-note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 版本演进 ---------- */
.page-about .ab-era-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
  border-radius: var(--r-card);
  background: rgba(14, 46, 60, 0.5);
}

.page-about .ab-era-svg {
  display: block;
  min-width: 820px;
  width: 100%;
  height: auto;
}

.page-about .ab-era-nav {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 20px 0 0;
  padding-bottom: 6px;
}

.page-about .ab-era-nav a {
  flex: 0 0 auto;
  padding: 8px 16px;
  border: 1px solid var(--ab-line-soft);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--ice-blue);
  text-decoration: none;
  transition: background 180ms var(--ease), color 180ms var(--ease);
}

.page-about .ab-era-nav a:hover,
.page-about .ab-era-nav a:focus-visible {
  background: var(--flare);
  border-color: var(--flare);
  color: var(--ice-deep);
}

.page-about .ab-era-notes {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  margin-top: clamp(22px, 3.4vw, 36px);
}

.page-about .ab-era-note {
  padding: 22px 22px 24px;
  border-radius: var(--r-card);
  background: var(--ice-steel);
  border-top: 3px solid var(--grass);
}

.page-about .ab-era-note--live {
  border-top-color: var(--flare);
}

.page-about .ab-era-note__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ice-blue);
}

.page-about .ab-era-note--live .ab-era-note__kicker {
  color: var(--flare-soft);
}

.page-about .ab-era-note__t {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--ice-white);
}

.page-about .ab-era-note p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(234, 246, 251, 0.78);
}

/* ---------- 家庭观赛清单 ---------- */
.page-about .ab-figure--tall .ab-img {
  max-height: 460px;
}

.page-about .ab-fam {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  margin-top: clamp(24px, 3.6vw, 40px);
  align-items: start;
}

.page-about .ab-fam__card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: var(--r-card);
  background: #ffffff;
  box-shadow: 0 14px 34px rgba(7, 26, 34, 0.08);
}

.page-about .ab-fam__bar {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 18px;
  background: var(--pine);
  color: var(--ice-white);
}

.page-about .ab-fam__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--flare-soft);
}

.page-about .ab-fam__name {
  margin: 0;
  font-size: 16.5px;
  font-weight: 600;
}

.page-about .ab-fam__body {
  padding: 16px 18px 20px;
}

.page-about .ab-fam__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #24404a;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-eco {
  position: relative;
  background: var(--pine);
  color: var(--ice-white);
  padding-block: clamp(58px, 9vw, 118px);
  clip-path: polygon(0 0, 100% 30px, 100% 100%, 0 calc(100% - 30px));
}

.page-about .ab-head--eco .ab-h2 {
  color: var(--ice-white);
}

.page-about .ab-eco__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr 1fr;
}

.page-about .ab-eco__item {
  padding: 18px 16px 20px;
  border-radius: var(--r-soft);
  background: rgba(7, 26, 34, 0.34);
  border-bottom: 2px solid rgba(255, 106, 26, 0.55);
}

.page-about .ab-eco__n {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--ice-blue);
}

.page-about .ab-eco__l {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.66;
  color: rgba(234, 246, 251, 0.76);
}

.page-about .ab-eco__text {
  margin-top: clamp(24px, 3.6vw, 40px);
  max-width: 74ch;
}

.page-about .ab-eco__text p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(234, 246, 251, 0.86);
}

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

.page-about .ab-eco__text a {
  color: var(--flare-soft);
}

/* ---------- 延伸阅读 ---------- */
.page-about .ab-sec--end {
  padding-block: clamp(48px, 7vw, 92px) clamp(56px, 8vw, 110px);
}

.page-about .ab-more {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(91, 118, 131, 0.28);
}

.page-about .ab-more__item {
  border-bottom: 1px solid rgba(91, 118, 131, 0.28);
}

.page-about .ab-more__item a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  padding: 18px 4px;
  text-decoration: none;
  transition: transform 180ms var(--ease), color 180ms var(--ease);
}

.page-about .ab-more__item a:hover,
.page-about .ab-more__item a:focus-visible {
  transform: translateX(6px);
}

.page-about .ab-more__t {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-more__d {
  flex: 1 1 260px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--steel);
  text-align: left;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-keys {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

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

  .page-about .ab-era-note--live {
    grid-column: 1 / -1;
  }

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

@media (min-width: 960px) {
  .page-about .ab-split {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .ab-split--rev {
    grid-template-columns: 4fr 8fr;
  }

  .page-about .ab-side {
    position: sticky;
    top: 28px;
  }

  .page-about .ab-era-notes {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .ab-era-note--live {
    grid-column: auto;
  }

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

  .page-about .ab-more__d {
    text-align: right;
  }

  .page-about .ab-eco {
    clip-path: polygon(0 0, 100% 64px, 100% 100%, 0 calc(100% - 64px));
  }
}

@media (hover: none) {
  .page-about .ab-more__item a:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tag,
  .page-about .ab-more__item a,
  .page-about .ab-era-nav a {
    transition: none;
  }
}
</final_tag>