.page-about {
  --about-toc-w: 212px;
  background: var(--c-ink);
  color: var(--c-mist);
  font-family: var(--f-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(20px, 3.5vw, 36px) clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--line-mid);
  background: var(--c-ink);
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(90% 72% at 12% 0%, rgba(11, 27, 51, 0.78), transparent 62%),
    linear-gradient(180deg, rgba(7, 30, 26, 0.52) 0%, rgba(7, 30, 26, 0.9) 56%, var(--c-ink) 100%);
}
.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(16px, 2.6vw, 28px);
}
.page-about .about-kicker {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-ice);
}
.page-about .about-hero h1 {
  margin: 0 0 16px;
  max-width: 20ch;
  font-family: var(--f-heading);
  font-size: clamp(30px, 5.4vw, 52px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}
.page-about .about-lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(232, 240, 233, 0.82);
}
.page-about .hero-scale {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-mid);
}
.page-about .hero-scale > li {
  position: relative;
  padding-top: 14px;
  min-width: 0;
}
.page-about .hero-scale > li::before {
  content: "";
  position: absolute;
  top: -16px;
  left: 0;
  width: 1px;
  height: 16px;
  background: var(--line-strong);
}
.page-about .hero-scale__y {
  display: block;
  font-family: var(--f-score);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  padding-block: clamp(34px, 6vw, 72px);
}
@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }
}
.page-about .about-toc {
  border-top: 1px solid var(--line-mid);
  padding-top: 14px;
}
@media (min-width: 980px) {
  .page-about .about-toc {
    position: sticky;
    top: 92px;
  }
}
.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(232, 240, 233, 0.55);
}
.page-about .about-toc__list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}
.page-about .about-toc__list > li + li {
  border-top: 1px solid var(--line);
}
.page-about .about-toc__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: rgba(232, 240, 233, 0.82);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--c-lime);
}
.page-about .about-toc__list a:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: 3px;
}
.page-about .about-toc__num {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-sage);
  flex: none;
}
.page-about .about-toc__note {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(232, 240, 233, 0.6);
}
.page-about .about-toc__note a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 231, 212, 0.4);
}
.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line);
}
.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}
.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  margin-bottom: 16px;
}
.page-about .sec-num {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-lime);
  padding-top: 3px;
}
.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--f-heading);
  font-size: clamp(20px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-mist);
}
.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 240, 233, 0.84);
}
.page-about .about-sec p:last-child {
  margin-bottom: 0;
}
.page-about .about-sec a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 231, 212, 0.4);
}
.page-about .about-sec a:hover,
.page-about .about-sec a:focus-visible {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}
.page-about .num {
  font-family: var(--f-score);
  font-size: 1.14em;
  font-weight: 700;
  color: var(--c-lime);
  letter-spacing: 0.01em;
}
.page-about .side-note {
  position: relative;
  margin: 18px 0 0;
  padding: 6px 0 6px 14px;
  max-width: 56ch;
  border-left: 2px solid var(--c-orange);
  font-family: var(--f-mono);
  font-size: 12px;
  line-height: 1.75;
  color: rgba(232, 240, 233, 0.7);
}
.page-about .side-note a {
  color: var(--c-ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 231, 212, 0.4);
}

/* ---------- 工作方法 ---------- */
.page-about .method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
@media (min-width: 780px) {
  .page-about .method-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    gap: 24px;
    align-items: start;
  }
}
.page-about .duty-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .duty-list > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 240, 233, 0.78);
}
@media (min-width: 560px) {
  .page-about .duty-list > li {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 14px;
  }
}
.page-about .duty-list__key {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-lime);
  padding-top: 4px;
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-mid);
  background: var(--c-navy);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 8px 10px;
  border-top: 1px solid var(--line);
  font-family: var(--f-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: rgba(232, 240, 233, 0.6);
}
.page-about .about-figure--tall img {
  aspect-ratio: 3 / 4;
}

/* ---------- 联赛色带 ---------- */
.page-about .band-list {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}
@media (min-width: 700px) {
  .page-about .band-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .band {
  padding: 12px 14px 12px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--band, var(--c-sage));
  background: rgba(11, 27, 51, 0.42);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.page-about .band:hover,
.page-about .band:focus {
  background: rgba(11, 27, 51, 0.72);
  border-color: var(--line-mid);
  border-left-color: var(--band, var(--c-sage));
}
.page-about .band:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: 2px;
}
.page-about .band--fb { --band: #2F7A5E; }
.page-about .band--bb { --band: #2F5D9E; }
.page-about .band--tn { --band: #8A4257; }
.page-about .band--es { --band: #6A4FA8; }
.page-about .band__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}
.page-about .band__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-mist);
}
.page-about .band__tag {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(232, 240, 233, 0.55);
}
.page-about .band__desc {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(232, 240, 233, 0.74);
  overflow: hidden;
}
@media (hover: hover) and (pointer: fine) {
  .page-about .band__desc {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease);
  }
  .page-about .band:hover .band__desc,
  .page-about .band:focus .band__desc {
    max-height: 120px;
    margin-top: 6px;
    opacity: 1;
  }
}

/* ---------- 时间刻度 ---------- */
.page-about .tm-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}
@media (min-width: 860px) {
  .page-about .tm-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 28px;
    align-items: start;
  }
}
.page-about .tm {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}
.page-about .tm::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--line-mid);
}
.page-about .tm__node {
  position: relative;
  padding-bottom: 22px;
}
.page-about .tm__node:last-child {
  padding-bottom: 0;
}
.page-about .tm__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--c-lime);
  border-radius: 50%;
  background: var(--c-ink);
  transition: background 0.18s var(--ease);
}
.page-about .tm__node:hover::before,
.page-about .tm__node:focus::before {
  background: var(--c-lime);
}
.page-about .tm__node:focus-visible {
  outline: 2px solid var(--c-ice);
  outline-offset: 4px;
}
.page-about .tm__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 12px;
}
.page-about .tm__year {
  font-family: var(--f-score);
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--c-lime);
}
.page-about .tm__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-mist);
}
.page-about .tm__note {
  margin: 6px 0 0;
  max-width: 54ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(232, 240, 233, 0.74);
  overflow: hidden;
}
@media (hover: hover) and (pointer: fine) {
  .page-about .tm__note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease);
  }
  .page-about .tm__node:hover .tm__note,
  .page-about .tm__node:focus .tm__note {
    max-height: 200px;
    margin-top: 6px;
    opacity: 1;
  }
}

/* ---------- 数据条 ---------- */
.page-about .stat-row {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (min-width: 820px) {
  .page-about .stat-row {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}
.page-about .stat {
  background: var(--c-ink);
  padding: 16px 14px;
  min-width: 0;
}
.page-about .stat__val {
  display: block;
  margin-bottom: 8px;
  white-space: nowrap;
}
.page-about .stat__num {
  font-family: var(--f-score);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-lime);
}
.page-about .stat__unit {
  margin-left: 3px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(232, 240, 233, 0.66);
}
.page-about .stat__key {
  display: block;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(232, 240, 233, 0.76);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 4.5vw, 52px);
  padding: clamp(20px, 4vw, 34px);
  border: 1px solid var(--line-mid);
  border-left: 3px solid var(--c-orange);
  background: linear-gradient(145deg, var(--c-navy), var(--c-ink-2) 72%);
}
.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-family: var(--f-heading);
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-mist);
}
.page-about .about-cta p {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(232, 240, 233, 0.8);
}
.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .cta-links .btn {
  font-size: 14px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .band__desc,
  .page-about .tm__note,
  .page-about .band,
  .page-about .tm__node::before {
    transition: none;
  }
}