.page-about {
  --about-idx: 176px;
  --about-tight: clamp(28px, 5vw, 56px);
  background: var(--night-ink);
  color: var(--goal-white);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about a:focus-visible {
  outline: 2px solid var(--neon-grass);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 4vw, 32px) 0 clamp(34px, 7vw, 76px);
  border-bottom: 1px solid var(--hairline-green);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(182, 255, 59, 0.09), transparent 62%),
    radial-gradient(90% 70% at 94% 6%, rgba(47, 211, 160, 0.07), transparent 58%);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--chalk-grey);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--hairline-green);
}

.page-about .breadcrumbs a {
  color: var(--chalk-grey);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon-grass);
  border-bottom-color: var(--neon-grass);
}

.page-about .about-hero .eyebrow {
  margin: 30px 0 0;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2.1rem, 7.4vw, 4.6rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 33em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(242, 246, 239, 0.84);
}

.page-about .about-hero__fig {
  margin: 34px 0 0;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--chalk-grey);
}

/* ---------- 框架：左索引 + 右长文 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-tight);
  padding-top: clamp(30px, 6vw, 60px);
}

.page-about .about-index {
  border: var(--line);
  background: var(--pitch-deep);
  box-shadow: var(--shadow-hard);
  padding: 16px 14px;
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--referee-yellow);
}

.page-about .about-index ol {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 6px;
  font-size: var(--fs-13);
  line-height: 1.4;
  color: rgba(242, 246, 239, 0.78);
  text-decoration: none;
  border-left: 2px solid transparent;
}

.page-about .about-index a span {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--chalk-grey);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--neon-grass);
  background: rgba(182, 255, 59, 0.08);
  border-left-color: var(--neon-grass);
}

.page-about .about-index a:hover span,
.page-about .about-index a:focus-visible span {
  color: var(--neon-grass);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(34px, 6vw, 66px) 0;
  border-top: 1px solid var(--hairline-green);
}

.page-about .about-body > .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-sec__num {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--night-ink);
  background: var(--neon-grass);
}

.page-about .about-sec__head .eyebrow {
  margin: 0;
}

.page-about .about-sec h2 {
  margin: 0 0 18px;
  font-size: clamp(1.55rem, 4.6vw, 2.5rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 800;
}

.page-about .about-prose p {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(242, 246, 239, 0.84);
}

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

.page-about .about-prose strong {
  color: var(--neon-grass);
  font-weight: 700;
}

.page-about .about-prose a {
  color: var(--neon-grass);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-green);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  border-bottom-color: var(--neon-grass);
}

.page-about .about-prose--tight {
  margin-top: 20px;
}

/* ---------- 双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-tight);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--line);
  box-shadow: var(--shadow-hard);
  background: var(--stand-surface);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--chalk-grey);
}

/* ---------- 战术板便签 ---------- */
.page-about .about-quote {
  margin: clamp(24px, 5vw, 44px) 0 0;
  padding: 22px 20px;
  border: var(--line);
  border-left: 6px solid var(--neon-grass);
  background: var(--stand-surface);
  box-shadow: var(--shadow-hard);
}

.page-about .about-quote p {
  margin: 0;
  font-size: var(--fs-18);
  line-height: 1.7;
  font-weight: 600;
  color: var(--goal-white);
}

.page-about .about-quote footer {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--chalk-grey);
}

/* ---------- 四道工序 ---------- */
.page-about .about-steps {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--hairline-green);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--hairline-green);
}

.page-about .about-step__n {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--neon-grass);
}

.page-about .about-step h3 {
  margin: 0 0 6px;
  font-size: var(--fs-18);
  line-height: 1.4;
  font-weight: 700;
}

.page-about .about-step p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(242, 246, 239, 0.78);
}

/* ---------- 年份时间轴 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
  padding-left: 26px;
  border-left: 2px solid var(--hairline-green);
}

.page-about .about-year {
  position: relative;
}

.page-about .about-year + .about-year {
  margin-top: 4px;
}

.page-about .about-year::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 14px;
  width: 11px;
  height: 11px;
  background: var(--neon-grass);
  box-shadow: 0 0 0 4px var(--night-ink);
}

.page-about .about-year summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 10px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-year summary::-webkit-details-marker {
  display: none;
}

.page-about .about-year__y {
  font-family: var(--font-mono);
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--neon-grass);
  letter-spacing: 0.02em;
}

.page-about .about-year__t {
  font-size: var(--fs-18);
  font-weight: 700;
}

.page-about .about-year__mark {
  margin-left: auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  color: var(--referee-yellow);
  background: var(--pitch-deep);
  flex: none;
}

.page-about .about-year__mark::before {
  content: "+";
}

.page-about .about-year[open] .about-year__mark::before {
  content: "−";
}

.page-about .about-year[open] .about-year__mark {
  color: var(--night-ink);
  background: var(--referee-yellow);
  border-color: var(--referee-yellow);
}

.page-about .about-year summary:hover .about-year__t,
.page-about .about-year summary:focus-visible .about-year__t {
  color: var(--neon-grass);
}

.page-about .about-year__body {
  max-width: 34em;
  padding: 0 0 16px;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(242, 246, 239, 0.8);
}

/* ---------- 阵容表 ---------- */
.page-about .about-roster {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hairline-green);
}

.page-about .about-roster li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 8px;
  border-bottom: 1px solid var(--hairline-green);
}

.page-about .about-roster li:nth-child(odd) {
  background: rgba(23, 54, 43, 0.6);
}

.page-about .about-roster__role {
  font-size: var(--fs-16);
  color: rgba(242, 246, 239, 0.84);
}

.page-about .about-roster__num {
  font-family: var(--font-mono);
  font-size: var(--fs-22);
  font-weight: 700;
  color: var(--neon-grass);
  font-variant-numeric: tabular-nums;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: 6px;
  padding: clamp(22px, 5vw, 38px);
  border: var(--line);
  background: var(--pitch-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-top-link {
  display: inline-block;
  margin-top: 30px;
  padding-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--chalk-grey);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-green);
}

.page-about .about-top-link:hover,
.page-about .about-top-link:focus-visible {
  color: var(--neon-grass);
  border-bottom-color: var(--neon-grass);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__lede {
    font-size: var(--fs-18);
  }

  .page-about .about-prose p,
  .page-about .about-step p,
  .page-about .about-year__body {
    font-size: var(--fs-18);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-idx) minmax(0, 1fr);
    gap: clamp(40px, 4.5vw, 72px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 108px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
    align-items: start;
  }

  .page-about .about-figure {
    margin: 4px 0 0;
  }

  .page-about .about-figure--tilt {
    transform: rotate(1.1deg);
  }

  .page-about .about-quote {
    transform: rotate(-0.7deg);
    max-width: 46em;
  }

  .page-about .about-sec h2 {
    margin-bottom: 22px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-year::before {
    left: -40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure--tilt,
  .page-about .about-quote {
    transform: none;
  }
}