.page-about {
  --about-rail: 216px;
  --about-block-gap: 84px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -8% -4% 0;
  background:
    radial-gradient(640px 380px at 78% 6%, rgba(34, 224, 214, 0.16), transparent 64%),
    radial-gradient(480px 320px at 6% 88%, rgba(255, 122, 47, 0.1), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
  }
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .hero-metrics {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

@media (min-width: 700px) {
  .page-about .hero-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .hero-metrics li {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ink-700);
  border-left: 2px solid var(--cyan);
  background: rgba(13, 23, 48, 0.72);
}

.page-about .hero-metrics__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.4rem, 4vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
}

.page-about .hero-metrics__unit {
  margin-left: 2px;
  font-size: 1rem;
  color: var(--cyan);
}

.page-about .hero-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero__visual {
  padding: 20px 20px 16px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--ink-700);
  background: linear-gradient(158deg, rgba(13, 23, 48, 0.94), rgba(6, 11, 24, 0.96));
  box-shadow: var(--shadow-panel);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-hero__visual:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 224, 214, 0.55);
}

.page-about .about-visual {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-visual__line {
  fill: none;
  stroke: rgba(34, 224, 214, 0.45);
  stroke-width: 1.5;
}

.page-about .about-visual__line--soft {
  stroke: rgba(147, 166, 192, 0.22);
  stroke-width: 1;
}

.page-about .about-visual__pulse {
  fill: none;
  stroke: var(--orange);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-dasharray: 6 10;
  animation: about-pulse-dash 3.6s linear infinite;
}

@keyframes about-pulse-dash {
  to {
    stroke-dashoffset: -128;
  }
}

.page-about .about-visual__dot {
  fill: var(--cyan);
}

.page-about .about-hero__caption {
  margin: 14px 4px 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 正文双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 40px;
}

@media (min-width: 1020px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .about-index {
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
  background: rgba(13, 23, 48, 0.55);
}

@media (min-width: 1020px) {
  .page-about .about-index {
    position: sticky;
    top: 104px;
    padding: 4px 0 4px 18px;
    border: none;
    border-left: 1px solid var(--ink-700);
    border-radius: 0;
    background: none;
  }
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

@media (min-width: 1020px) {
  .page-about .about-index__list {
    grid-template-columns: minmax(0, 1fr);
  }
}

.page-about .about-index__link {
  display: block;
  padding: 9px 10px 9px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index__link:hover {
  color: var(--text);
  background: rgba(34, 224, 214, 0.07);
}

.page-about .about-index__link[aria-current="true"],
.page-about .about-index__link[aria-current="location"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(34, 224, 214, 0.08);
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-index__idx {
  margin-right: 8px;
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--cyan-deep);
}

/* ---------- 章节流 ---------- */
.page-about .about-stream {
  display: grid;
  gap: var(--about-block-gap);
}

@media (min-width: 1020px) {
  .page-about .about-stream {
    gap: 104px;
  }
}

.page-about .about-block {
  position: relative;
  scroll-margin-top: 120px;
}

.page-about .about-block + .about-block::before {
  content: "";
  position: absolute;
  top: -44px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34, 224, 214, 0.45) 22%, rgba(79, 169, 122, 0.35) 62%, transparent);
}

@media (min-width: 1020px) {
  .page-about .about-block + .about-block::before {
    top: -54px;
  }
}

.page-about .about-block__head {
  max-width: 68ch;
}

.page-about .about-block__head .display {
  margin: 10px 0 0;
}

.page-about .about-block__head .note {
  margin: 16px 0 0;
}

.page-about .about-block__media {
  margin: 32px 0 0;
}

.page-about .about-block .media {
  margin: 0;
}

.page-about .about-block__media.media {
  margin: 32px 0 0;
}

/* ---------- 赛季目录 ---------- */
.page-about .season-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .season-list__item {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
  background: rgba(13, 23, 48, 0.6);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

@media (min-width: 760px) {
  .page-about .season-list__item {
    grid-template-columns: 138px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .season-list__item:hover {
  transform: translateY(-3px);
  border-color: rgba(34, 224, 214, 0.5);
}

.page-about .season-list__year {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .season-list__body h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .season-list__body p {
  margin: 6px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .versions-layout {
  display: grid;
  gap: 28px;
  margin-top: 36px;
}

@media (min-width: 900px) {
  .page-about .versions-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 40px;
    align-items: start;
  }
}

.page-about .version-stack {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .version-card {
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
  background: linear-gradient(150deg, rgba(34, 224, 214, 0.07), rgba(13, 23, 48, 0.9) 58%);
  transition: transform 0.25s ease, border-color 0.25s ease, opacity 0.25s ease;
}

.page-about .version-card:hover,
.page-about .version-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .version-stack:hover .version-card:not(:hover) {
  transform: scale(0.99);
  opacity: 0.84;
}

.page-about .version-card__tag {
  display: inline-block;
  padding: 3px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 122, 47, 0.42);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .version-card h3 {
  margin: 12px 0 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .version-card p {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .versions-layout__figure {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .team-layout__figure {
  margin: 0;
}

.page-about .team-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .team-facts > div {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--ink-700);
  background: rgba(13, 23, 48, 0.66);
}

.page-about .team-facts dt {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .team-facts dd {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text);
}

.page-about .crew-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

@media (min-width: 760px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .crew-card {
  padding: 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
  background: rgba(13, 23, 48, 0.5);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .crew-card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 224, 214, 0.5);
}

.page-about .crew-card__mark {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(34, 224, 214, 0.9), rgba(11, 143, 139, 0.45));
}

.page-about .crew-card:nth-child(2) .crew-card__mark {
  background: linear-gradient(135deg, rgba(255, 122, 47, 0.9), rgba(255, 178, 122, 0.4));
}

.page-about .crew-card:nth-child(3) .crew-card__mark {
  background: linear-gradient(135deg, rgba(79, 169, 122, 0.9), rgba(34, 224, 214, 0.35));
}

.page-about .crew-card h3 {
  margin: 14px 0 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .crew-card p {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .crew-card__stat {
  display: block;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .ally-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

@media (min-width: 720px) {
  .page-about .ally-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .ally-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--ink-700);
  background: linear-gradient(160deg, rgba(255, 122, 47, 0.08), rgba(13, 23, 48, 0.88) 62%);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .ally-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 122, 47, 0.55);
}

.page-about .ally-card__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange-soft);
}

.page-about .ally-card h3 {
  margin: 12px 0 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .ally-card p {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ally-note {
  margin: 22px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ally-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 214, 0.45);
}

.page-about .ally-note a:hover {
  border-bottom-color: var(--orange);
  color: var(--orange-soft);
}

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

/* ---------- 数据质量 ---------- */
.page-about .quality-panel {
  display: grid;
  gap: 28px;
  margin-top: 34px;
  padding: 28px 24px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(34, 224, 214, 0.34);
  background:
    radial-gradient(520px 260px at 8% 0%, rgba(34, 224, 214, 0.14), transparent 66%),
    linear-gradient(160deg, rgba(13, 23, 48, 0.95), rgba(6, 11, 24, 0.96));
  box-shadow: var(--shadow-panel);
}

@media (min-width: 900px) {
  .page-about .quality-panel {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
    padding: 36px 34px;
  }
}

.page-about .quality-panel__figure {
  display: block;
}

.page-about .quality-panel__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.75rem, 9vw, 3.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .quality-panel__unit {
  margin-left: 2px;
  font-size: 1.375rem;
  color: var(--cyan-deep);
}

.page-about .quality-panel__label {
  display: block;
  margin-top: 12px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .quality-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .quality-panel__list li {
  padding-left: 16px;
  border-left: 1px solid var(--ink-700);
}

.page-about .quality-panel__list h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .quality-panel__list p {
  margin: 7px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 赛季节奏 ---------- */
.page-about .pacing-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: pacing;
}

.page-about .pacing-list li {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--ink-700);
}

@media (min-width: 760px) {
  .page-about .pacing-list li {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

.page-about .pacing-list li:first-child {
  border-top: 1px dashed var(--ink-700);
}

.page-about .pacing-list__when {
  font-family: var(--mono);
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .pacing-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta__panel {
  display: grid;
  gap: 24px;
  padding: 32px 24px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--ink-700);
  background:
    radial-gradient(560px 260px at 88% 0%, rgba(255, 122, 47, 0.14), transparent 66%),
    linear-gradient(150deg, rgba(13, 23, 48, 0.95), rgba(6, 11, 24, 0.95));
}

@media (min-width: 860px) {
  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
    align-items: center;
    padding: 42px 44px;
  }
}

.page-about .about-cta__copy .display {
  margin: 10px 0 0;
}

.page-about .about-cta__copy .note {
  margin: 16px 0 0;
  max-width: 62ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero__inner,
  .page-about .versions-layout,
  .page-about .team-layout,
  .page-about .ally-grid,
  .page-about .crew-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .team-facts {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-visual__pulse {
    animation: none;
  }

  .page-about .about-hero__visual:hover,
  .page-about .version-card:hover,
  .page-about .version-card:focus-within,
  .page-about .version-stack:hover .version-card:not(:hover),
  .page-about .season-list__item:hover,
  .page-about .crew-card:hover,
  .page-about .ally-card:hover {
    transform: none;
  }
}