.page-about {
  background: var(--color-surface);
}

.page-about .breadcrumb {
  padding-block: var(--space-3) var(--space-2);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 430px;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
}

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-about .about-hero__inner {
  position: relative;
  width: 100%;
  padding-block: var(--space-6) var(--space-4);
  color: var(--color-contrast-ink);
}

.page-about .about-hero h1 {
  margin: var(--space-2) 0 0;
  max-width: 18ch;
  font-size: clamp(var(--text-2xl), 6.4vw, var(--text-4xl));
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin-top: var(--space-3);
  font-size: var(--text-base);
  line-height: 1.55;
  color: var(--color-contrast-ink);
}

.page-about .about-hero__jump {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-accent);
  border-radius: var(--radius-lg);
  color: var(--color-contrast-ink);
  font-size: var(--text-base);
  text-decoration: none;
  transition: background-color 120ms cubic-bezier(0.2, 0, 0.2, 1), color 120ms cubic-bezier(0.2, 0, 0.2, 1);
}

.page-about .about-hero__jump:hover {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

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

/* ---------- 叙事段落通用 ---------- */

.page-about .story {
  padding-block: var(--section-y);
}

.page-about .story--method,
.page-about .story--academy {
  background: var(--color-surface-alt);
}

.page-about .story__title {
  max-width: 26ch;
  margin-bottom: var(--space-4);
  font-size: clamp(var(--text-xl), 3.6vw, var(--text-2xl));
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .story__lead {
  max-width: var(--measure);
  margin-top: calc(-1 * var(--space-3));
  margin-bottom: var(--space-6);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-about .story__body p {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink);
}

.page-about .story__body p + p {
  margin-top: var(--space-3);
}

.page-about .figure-caption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

/* ---------- 取数与核对 ---------- */

.page-about .method__layout {
  display: grid;
  gap: var(--space-6);
}

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

.page-about .method__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 0;
}

/* ---------- 四个小组 ---------- */

.page-about .crew__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about .crew__item {
  border-left: var(--border-thin) solid var(--color-primary);
  padding-left: var(--space-2);
}

.page-about .crew__item h3 {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .crew__item p {
  margin: 0;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage__layout {
  display: grid;
  gap: var(--space-6);
  align-items: center;
}

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

.page-about .coverage__svg {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin-inline: auto;
}

.page-about .coverage__svg .ring-outer {
  fill: none;
  stroke: var(--color-line);
  stroke-width: 2;
}

.page-about .coverage__svg .ring-mid {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 2;
  opacity: 0.55;
}

.page-about .coverage__svg .ring-inner {
  fill: var(--color-primary-soft);
  stroke: var(--color-primary);
  stroke-width: 3;
}

.page-about .coverage__svg .ray {
  stroke: var(--color-accent);
  stroke-width: 2;
  opacity: 0.45;
}

.page-about .coverage__svg .core-dot {
  fill: var(--color-accent);
}

/* ---------- 青训档案 ---------- */

.page-about .academy__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .academy__figure {
  margin: var(--space-4) 0 0;
}

.page-about .academy__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .academy__list {
  position: relative;
  padding-left: var(--space-4);
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-about .academy__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  bottom: 0.7em;
  width: var(--border-thin);
  background: var(--color-line);
}

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

.page-about .academy__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-4));
  top: 0.7em;
  width: 10px;
  height: 10px;
  transform: translateX(-50%);
  background: var(--color-accent);
  border-radius: var(--radius-sm);
}

.page-about .academy__item > summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) 0;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  border-radius: var(--radius-sm);
}

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

.page-about .academy__item > summary::after {
  content: "＋";
  margin-left: auto;
  color: var(--color-primary);
  font-size: var(--text-base);
}

.page-about .academy__item[open] > summary::after {
  content: "－";
}

.page-about .academy__item > summary:hover {
  color: var(--color-primary);
}

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

.page-about .academy__item p {
  max-width: 52ch;
  margin: var(--space-1) 0 var(--space-2);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 行动出口 ---------- */

.page-about .story--next {
  background: var(--color-primary-soft);
}

.page-about .next__body {
  max-width: var(--measure);
}

.page-about .next__body p {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink);
}

.page-about .next__body p + p {
  margin-top: var(--space-3);
}

.page-about .next__body a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .next__body a:hover {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  text-decoration: none;
}

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

.page-about .next__action {
  margin-top: var(--space-6);
}

.page-about .next__action .btn {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  text-decoration: none;
}

.page-about .next__action .btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-about .next__action .btn--primary:hover {
  background: var(--color-surface);
  color: var(--color-primary);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    min-height: 500px;
  }

  .page-about .method__layout {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .coverage__layout {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: center;
  }

  .page-about .academy__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .academy__figure {
    margin-top: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-about .crew__grid {
    grid-template-columns: 1.35fr 1fr 1fr 1.15fr;
    gap: var(--space-3);
  }

  .page-about .story {
    padding-block: var(--section-y-lg);
  }

  .page-about .coverage__layout {
    grid-template-columns: 1.15fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__jump {
    transition: none;
  }
}
</main>