.page-about {
  --ab-text: #E3EFEB;
  --ab-dim: #A9BDB8;
  --ab-ink-soft: #46564F;
  --ab-rail: 196px;
  background: var(--ink);
  color: var(--ab-text);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

.page-about__crumbs {
  padding-top: 20px;
  padding-bottom: 8px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 18px 0 52px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__glow {
  position: absolute;
  inset: -38% -12% auto -12%;
  height: 440px;
  pointer-events: none;
  background:
    radial-gradient(58% 100% at 20% 0%, rgba(56, 232, 200, 0.18), transparent 70%),
    radial-gradient(44% 92% at 84% 10%, rgba(255, 138, 61, 0.13), transparent 72%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(29px, 7.4vw, 46px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ab-text);
}

.page-about .about-hero__note {
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-cyan);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure figcaption,
.page-about .about-band figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ab-dim);
}

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

.page-about .about-body {
  display: grid;
  gap: 30px;
  padding-top: 44px;
  padding-bottom: 72px;
}

/* ── 左侧时间刻度 ── */
.page-about .about-rail__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--ab-dim);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-rail__item::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .about-rail__item.is-active,
.page-about .about-rail__item[aria-current] {
  color: var(--cyan);
  background: var(--glass);
}

.page-about .about-rail__item.is-active::before,
.page-about .about-rail__item[aria-current]::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(56, 232, 200, 0.16);
}

.page-about .about-rail__item.is-active .about-rail__num,
.page-about .about-rail__item[aria-current] .about-rail__num {
  color: var(--cyan-soft);
}

/* ── 正文流 ── */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 68px;
  min-width: 0;
}

.page-about .about-sec {
  scroll-margin-top: 118px;
}

.page-about .about-sec__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-sec h2 {
  margin: 0;
  font-weight: 700;
  font-size: clamp(22px, 5.2vw, 31px);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lede {
  max-width: 60ch;
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-dim);
}

.page-about .about-sec__after {
  max-width: 62ch;
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

.page-about .about-sec__after a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: var(--line-cyan);
  text-underline-offset: 3px;
}

/* ── 比赛日时间线 ── */
.page-about .dayline {
  position: relative;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .dayline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--line-cyan), rgba(56, 232, 200, 0.06));
}

.page-about .dayline__row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 0 0 26px 26px;
}

.page-about .dayline__row:last-child {
  padding-bottom: 0;
}

.page-about .dayline__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line-cyan);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .dayline__row:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(56, 232, 200, 0.14);
}

.page-about .dayline__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .dayline__body h3 {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .dayline__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

/* ── 横向影像带 ── */
.page-about .about-band {
  margin: 28px 0 0;
}

.page-about .about-band .media {
  border-radius: var(--radius);
  overflow: hidden;
}

/* ── 三条内容主线 ── */
.page-about .tracks {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .track {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .track--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: transparent;
  border-top-color: var(--ink);
}

.page-about .track--orange {
  border-top-color: var(--orange);
}

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

.page-about .track h3 {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .track__desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

.page-about .track--paper .track__kicker {
  color: var(--ab-ink-soft);
}

.page-about .track--paper .track__desc {
  color: var(--ab-ink-soft);
}

.page-about .track__stat {
  display: inline-block;
  margin: 16px 0 0;
  padding: 4px 10px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .track--paper .track__stat {
  border-color: var(--paper-2);
  color: var(--ink);
}

/* ── 岗位折叠卡 ── */
.page-about .role-list {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.page-about .role {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .role[open] {
  border-color: var(--line-cyan);
  background: var(--ink-2);
}

.page-about .role__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  column-gap: 14px;
  row-gap: 2px;
  align-items: center;
  padding: 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .role__n {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 24px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .role__name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .role__hint {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--ab-dim);
}

.page-about .role__chev {
  position: relative;
  grid-row: span 2;
  grid-column: 3;
  width: 18px;
  height: 18px;
}

.page-about .role__chev::before,
.page-about .role__chev::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  border-radius: 2px;
}

.page-about .role__chev::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-about .role__chev::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  transition: transform var(--dur) var(--ease);
}

.page-about .role[open] .role__chev::after {
  transform: scaleY(0);
}

.page-about .role__body {
  padding: 0 18px 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

.page-about .role__body p {
  margin: 0 0 10px;
}

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

.page-about .about-note {
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(10px);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-text);
}

.page-about .about-note p {
  margin: 0;
}

/* ── 版本折叠卡 ── */
.page-about .vers {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ver {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-2);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.page-about .ver[open] {
  border-color: var(--line-cyan);
}

.page-about .ver__sum {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ver__badge {
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .ver__title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .ver__body {
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-dim);
}

.page-about .ver__body p {
  margin: 0 0 12px;
}

.page-about .ver__body ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .ver__body li {
  margin-bottom: 6px;
}

.page-about .ver__body li::marker {
  color: var(--cyan);
}

/* ── 数据旁注 ── */
.page-about .stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-about .stat {
  padding: 18px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--glass);
  backdrop-filter: blur(8px);
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 27px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ab-dim);
}

/* ── 引用块 ── */
.page-about .quote {
  margin: 26px 0 0;
  padding: 20px 22px;
  border-left: 4px solid var(--paper-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .quote p {
  margin: 0;
}

/* ── 延伸入口 ── */
.page-about .about-sec--more {
  padding-top: 34px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-links {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 4px;
  align-items: baseline;
  padding: 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ab-text);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: var(--line-cyan);
  background: var(--glass);
  transform: translateX(3px);
}

.page-about .about-link__k {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
}

.page-about .about-link__t {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-link__s {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-dim);
}

/* ── 平板 ── */
@media (min-width: 700px) {
  .page-about .dayline__row {
    grid-template-columns: 128px minmax(0, 1fr);
    column-gap: 24px;
  }

  .page-about .dayline__code {
    padding-top: 4px;
  }

  .page-about .dayline__body h3 {
    margin-top: 0;
  }

  .page-about .about-hero__actions {
    gap: 14px;
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: 40fr 60fr;
    align-items: end;
    gap: 40px;
  }

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

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

  .page-about .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-link {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 8px;
    align-content: start;
  }

  .page-about .about-link__k {
    grid-row: auto;
  }
}

/* ── 桌面：左栏常驻时间刻度 ── */
@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
    padding-top: 60px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 140px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .about-rail__item {
    padding: 11px 12px 11px 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  }

  .page-about .about-rail__item::before {
    margin-left: -3px;
  }

  .page-about .about-flow {
    gap: 92px;
  }

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

  .page-about .about-hero {
    padding-bottom: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .about-rail__item,
  .page-about .dayline__row::before {
    transition: none;
  }

  .page-about .about-link:hover,
  .page-about .about-link:focus-visible {
    transform: none;
  }
}
<<<END>>>