.page-about {
  --about-rule: rgba(27, 20, 16, 0.16);
  --about-grid-line: rgba(11, 90, 59, 0.055);
  --about-soft: rgba(27, 20, 16, 0.74);
  --about-tl-year: 58px;
  --about-tl-gap: 18px;
  background: var(--night);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: calc(var(--head-h, 114px) + clamp(22px, 4vw, 52px));
  padding-bottom: clamp(42px, 6vw, 86px);
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(201, 255, 77, 0.13), transparent 62%),
    radial-gradient(90% 80% at 4% 96%, rgba(11, 90, 59, 0.55), transparent 66%),
    var(--night);
  color: var(--chalk);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(201, 255, 77, 0.05) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(201, 255, 77, 0.05) 0 1px, transparent 1px 96px),
    linear-gradient(158deg, rgba(6, 26, 43, 0.94) 0%, rgba(6, 26, 43, 0.62) 48%, rgba(11, 90, 59, 0.82) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 58px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 7vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-stretch: condensed;
  color: var(--chalk);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 39rem;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(248, 244, 234, 0.86);
}

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

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 34px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid rgba(248, 244, 234, 0.18);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  font-variant-numeric: tabular-nums;
  color: var(--cash);
  line-height: 1.1;
}

.page-about .about-facts__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--steel);
  letter-spacing: 0.02em;
}

/* 章节预览目录 */
.page-about .about-toc {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid rgba(248, 244, 234, 0.16);
  border-radius: var(--radius-m);
  background: rgba(18, 54, 79, 0.72);
  backdrop-filter: blur(6px);
}

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

.page-about .about-toc__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--signal);
  white-space: nowrap;
}

.page-about .about-toc__rule {
  flex: 1 1 auto;
  min-width: 40px;
  height: 16px;
  color: rgba(143, 166, 180, 0.55);
}

.page-about .about-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__item + .about-toc__item {
  border-top: 1px dashed rgba(248, 244, 234, 0.14);
}

.page-about .about-toc__link {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 10px;
  padding: 11px 2px;
  min-height: 44px;
  color: var(--chalk);
  text-decoration: none;
  transition: color 160ms ease, background-color 160ms ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--signal);
}

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

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

.page-about .about-toc__label {
  font-size: 14.5px;
  line-height: 1.4;
}

.page-about .about-toc__year {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ---------- 纸面正文 ---------- */
.page-about .about-paper {
  color: var(--ink);
  background-color: var(--cream);
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-about .about-section {
  padding: clamp(44px, 6vw, 84px) 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-section:first-child {
  border-top: 0;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 30px);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-rail__num {
  position: relative;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--pitch);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__num::after {
  content: "";
  display: inline-block;
  width: 22px;
  height: 2px;
  margin-left: 8px;
  vertical-align: middle;
  background: var(--cash);
}

.page-about .about-rail__label {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: rgba(27, 20, 16, 0.55);
}

.page-about .about-body {
  max-width: 46rem;
  min-width: 0;
}

.page-about .about-body h2 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4.6vw, 2.25rem);
  line-height: 1.28;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.page-about .about-body p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

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

.page-about .about-body a {
  color: var(--pitch);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .about-body a:hover {
  color: var(--cash);
}

.page-about .about-note {
  margin-top: 20px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(27, 20, 16, 0.55);
  letter-spacing: 0.02em;
}

/* 受众说明 */
.page-about .about-audience {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-audience li {
  padding: 14px 16px;
  border-left: 3px solid var(--pitch);
  background: rgba(11, 90, 59, 0.06);
}

.page-about .about-audience strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

.page-about .about-audience span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-soft);
}

/* 时间线 */
.page-about .about-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 18px;
  left: calc(var(--about-tl-year) + var(--about-tl-gap) / 2);
  width: 1px;
  background: linear-gradient(180deg, var(--cash), rgba(11, 90, 59, 0.55));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-tl-year) minmax(0, 1fr);
  column-gap: var(--about-tl-gap);
  padding-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 8px;
  left: calc(var(--about-tl-year) + var(--about-tl-gap) / 2 - 5px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--pitch);
  box-shadow: 0 0 0 3px var(--cream);
}

.page-about .about-timeline__item--release::before {
  background: var(--cash);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--pitch);
  padding-top: 2px;
}

.page-about .about-timeline__item--release .about-timeline__year {
  color: var(--cash);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: clamp(1.02rem, 2.4vw, 1.16rem);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-timeline__content p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-timeline__tag {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--pitch);
  border: 1px solid rgba(11, 90, 59, 0.35);
  border-radius: var(--radius-s);
}

.page-about .about-timeline__item--release .about-timeline__tag {
  color: var(--alert);
  border-color: rgba(184, 68, 31, 0.4);
}

/* 数字指标 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 24px 0 26px;
}

.page-about .about-metric {
  padding: 16px 14px;
  border: 1px solid rgba(27, 20, 16, 0.12);
  border-radius: var(--radius-m);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  font-variant-numeric: tabular-nums;
  line-height: 1.05;
  color: var(--pitch);
}

.page-about .about-metric__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(27, 20, 16, 0.62);
  letter-spacing: 0.02em;
}

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

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

.page-about .about-figure img,
.page-about .about-split__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: rgba(27, 20, 16, 0.55);
  letter-spacing: 0.02em;
}

/* 联赛标签 */
.page-about .about-leagues__label {
  margin: 26px 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: rgba(27, 20, 16, 0.5);
}

.page-about .about-leagues {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-leagues li {
  padding: 5px 11px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink);
  border: 1px solid rgba(11, 90, 59, 0.24);
  border-radius: 999px;
  background: rgba(11, 90, 59, 0.05);
}

/* 编辑与审核 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 8px;
}

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

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

.page-about .about-checks {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-checks--tight {
  margin-top: 22px;
  margin-bottom: 24px;
}

.page-about .about-checks li {
  position: relative;
  padding-left: 18px;
}

.page-about .about-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--cash);
}

.page-about .about-checks strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 3px;
}

.page-about .about-checks span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* 认可卡 */
.page-about .about-recognition {
  margin: 0 0 24px;
  padding: 18px 18px 18px 20px;
  border-left: 4px solid var(--cash);
  background: rgba(255, 122, 26, 0.08);
}

.page-about .about-recognition__kicker {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--alert);
}

.page-about .about-recognition__text {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 联系区 ---------- */
.page-about .about-contact {
  padding: clamp(48px, 7vw, 92px) 0;
  color: var(--chalk);
  background:
    radial-gradient(100% 120% at 92% 0%, rgba(201, 255, 77, 0.14), transparent 58%),
    linear-gradient(135deg, var(--night) 0%, #08304a 52%, var(--pitch) 128%);
}

.page-about .about-contact__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-contact__lead h2 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5.4vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .about-contact__lead p {
  margin: 0;
  max-width: 36rem;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(248, 244, 234, 0.84);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-contact__list {
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(248, 244, 234, 0.2);
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(248, 244, 234, 0.14);
}

.page-about .about-contact__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-contact__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(15px, 3.4vw, 18px);
  font-variant-numeric: tabular-nums;
  line-height: 1.5;
  color: var(--chalk);
  word-break: break-word;
}

.page-about .about-contact__value--sm {
  font-family: var(--font-body);
  font-size: 14.5px;
  color: rgba(248, 244, 234, 0.88);
}

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

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

  .page-about .about-contact__row {
    grid-template-columns: 100px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-tl-year: 74px;
    --about-tl-gap: 24px;
  }

  .page-about .about-grid {
    grid-template-columns: 176px minmax(0, 1fr);
    column-gap: clamp(30px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-h, 114px) + 26px);
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    height: max-content;
  }

  .page-about .about-rail__num::after {
    display: block;
    width: 30px;
    margin: 8px 0 0;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(24px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-contact__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

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