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

/* ---------- 页面头部 ---------- */

.page-about .about-head {
  padding-block-start: calc(var(--section-y) * 0.8);
}

.page-about .about-head .crumbs {
  margin-block-end: var(--space-4);
}

.page-about .about-head__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-head h1 {
  margin: var(--space-2) 0 0;
  font-size: clamp(var(--text-xl), 7vw, var(--text-2xl));
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  max-width: 15ch;
}

.page-about .about-head .lede {
  margin-block-start: var(--space-3);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

.page-about .about-head__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  padding-block-start: var(--space-3);
  border-block-start: var(--border-thick) solid var(--color-primary);
}

.page-about .about-fact {
  display: grid;
  gap: var(--space-1);
  min-width: 0;
}

.page-about .about-fact .num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.page-about .about-fact__label {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-origin__text h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  max-width: 18ch;
}

.page-about .about-origin__text p {
  margin-block-start: var(--space-3);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

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

/* ---------- 为什么做多联赛对照 ---------- */

.page-about .about-why {
  color: var(--color-primary-ink);
}

.page-about .about-why .eyebrow {
  color: currentColor;
  opacity: 0.75;
}

.page-about .about-why h2 {
  margin: var(--space-2) 0 0;
  color: var(--color-primary-ink);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  max-width: 22ch;
}

.page-about .about-why__quotes {
  display: grid;
  gap: var(--space-3);
  margin-block-start: var(--space-4);
}

.page-about .about-quote {
  margin: 0;
  padding: var(--space-3);
  background: color-mix(in srgb, var(--color-primary-ink) 14%, transparent);
  border-inline-start: var(--border-thick) solid var(--color-primary-ink);
  border-block-start: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 32%, transparent);
}

.page-about .about-quote p {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-about .about-why__outro {
  margin-block-start: var(--space-4);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

.page-about .about-why .inline-link {
  color: var(--color-primary-ink);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-why .inline-link:hover {
  text-decoration-thickness: 3px;
}

/* ---------- 凭什么做好 ---------- */

.page-about .about-craft__head {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-craft__intro h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  max-width: 20ch;
}

.page-about .about-craft__intro .lede {
  margin-block-start: var(--space-3);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

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

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .timeline-node {
  position: relative;
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3);
  padding-inline-start: calc(var(--space-3) + var(--space-1));
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: calc(var(--space-1) * 0.75);
  background: var(--color-accent);
}

.page-about .timeline-node:hover,
.page-about .timeline-node:focus-within {
  transform: translate(calc(var(--space-1) * -0.5), calc(var(--space-1) * -0.5));
  box-shadow: var(--shadow-2);
  background: var(--color-highlight);
}

.page-about .timeline-node__year {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-primary-ink);
  background: var(--color-primary);
  padding: var(--space-1) calc(var(--space-2) * 0.75);
  clip-path: polygon(0 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
  transition: background-color 0.18s ease;
}

.page-about .timeline-node:hover .timeline-node__year,
.page-about .timeline-node:focus-within .timeline-node__year {
  background: var(--color-accent);
}

.page-about .timeline-node__body {
  min-width: 0;
}

.page-about .timeline-node__body h3 {
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
}

.page-about .timeline-node__body p {
  margin: var(--space-1) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-about .node-link {
  display: inline-block;
  margin-block-start: var(--space-2);
  padding-block-end: calc(var(--space-1) * 0.25);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
  border-block-end: var(--border-thin) solid currentColor;
}

.page-about .node-link:hover {
  color: var(--color-primary);
  border-block-end-color: var(--color-primary);
}

/* ---------- 现在做到哪一步 ---------- */

.page-about .about-now {
  color: var(--color-contrast-ink);
}

.page-about .about-now .eyebrow {
  color: currentColor;
  opacity: 0.72;
}

.page-about .about-now h2 {
  margin: var(--space-2) 0 0;
  color: var(--color-contrast-ink);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  max-width: 22ch;
}

.page-about .about-now__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-block-start: var(--space-4);
}

.page-about .now-stat {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .now-stat:hover {
  border-color: var(--color-contrast-accent);
  background: color-mix(in srgb, var(--color-contrast-ink) 11%, transparent);
}

.page-about .now-stat .num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-contrast-accent);
}

.page-about .now-stat__label {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-contrast-ink);
}

.page-about .now-stat__note {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-about .about-now__figure {
  margin: var(--space-6) 0 0;
}

/* ---------- 下一步 ---------- */

.page-about .about-next h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  max-width: 20ch;
}

.page-about .about-next__routes {
  display: grid;
  gap: var(--space-3);
  margin-block-start: var(--space-4);
}

.page-about .about-route {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
  color: inherit;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.page-about .about-route:hover {
  transform: translate(calc(var(--space-1) * -0.5), calc(var(--space-1) * -0.5));
  box-shadow: var(--shadow-2);
  background: var(--color-primary-soft);
}

.page-about .about-route__kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.page-about .about-route__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-about .about-route__desc {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 全局焦点反馈 ---------- */

.page-about a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

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

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

@media (min-width: 900px) {
  .page-about .about-head__grid {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-6);
    align-items: end;
  }

  .page-about .about-head__facts {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    padding-block-start: 0;
    padding-inline-start: var(--space-3);
    border-block-start: none;
    border-inline-start: var(--border-thick) solid var(--color-primary);
  }

  .page-about .about-origin__grid {
    grid-template-columns: 5fr 7fr;
    gap: var(--space-6);
    align-items: start;
  }

  .page-about .about-craft__head {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-6);
    align-items: center;
  }

  .page-about .about-quote--shift {
    margin-inline-start: clamp(var(--space-4), 12%, 180px);
  }

  .page-about .timeline-node {
    grid-template-columns: minmax(112px, 160px) 1fr;
    gap: var(--space-4);
    align-items: start;
  }

  .page-about .about-now__figure {
    margin-block-start: var(--space-8);
  }
}

@media (min-width: 1180px) {
  .page-about .about-head h1 {
    max-width: 16ch;
  }

  .page-about .about-origin__grid {
    gap: var(--space-8);
  }
}