.page-about {
  --about-line: rgba(12, 59, 68, 0.14);
  --about-line-soft: rgba(12, 59, 68, 0.08);
  background: var(--snow);
  color: var(--deep);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3.5vw, 34px) 0 0;
  background:
    radial-gradient(70% 62% at 84% 2%, rgba(72, 214, 201, 0.24), transparent 62%),
    radial-gradient(62% 58% at 2% 98%, rgba(200, 161, 90, 0.26), transparent 62%),
    var(--ink);
  color: var(--snow);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(221, 242, 245, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(221, 242, 245, 0.06) 1px, transparent 1px);
  background-size: 92px 92px;
  pointer-events: none;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(221, 242, 245, 0.55);
  padding-bottom: clamp(16px, 2.5vw, 26px);
}

.page-about .about-hero .breadcrumb a {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .breadcrumb__sep {
  color: rgba(221, 242, 245, 0.3);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(221, 242, 245, 0.68);
}

.page-about .about-kicker .mono {
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  color: var(--gold-soft);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-hero__lead h1 {
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 8vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--snow);
}

.page-about .about-hero__lead h1 em {
  font-style: normal;
  color: var(--lime);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(221, 242, 245, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__figure {
  display: grid;
  gap: 14px;
  margin: 0;
  align-content: start;
}

.page-about .about-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: rgba(12, 59, 68, 0.55);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--gold-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-snow);
}

.page-about .about-hero__stats > div {
  background: rgba(6, 26, 32, 0.72);
  padding: 12px 14px;
}

.page-about .about-hero__stats dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-hero__stats dd {
  margin: 6px 0 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  color: var(--gold-soft);
}

/* ---------- 赛季轨道 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--line);
}

.page-about .about-rail__scroller {
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--gold) transparent;
}

.page-about .about-rail__label {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  padding: 16px 18px 16px 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold);
  border-right: 1px solid var(--line);
  margin-right: 18px;
}

.page-about .about-rail__list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
  width: 196px;
  padding: 14px 16px 18px;
  border-right: 1px solid var(--line);
  display: grid;
  gap: 4px;
  position: relative;
  transition: background 0.25s var(--ease);
}

.page-about .about-rail__list li::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 16px;
  width: 22px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-rail__list li:hover {
  background: rgba(200, 161, 90, 0.1);
}

.page-about .about-rail__list .mono {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-rail__list b {
  font-size: 14px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-rail__list small {
  font-size: 12px;
  line-height: 1.6;
  color: rgba(221, 242, 245, 0.62);
}

/* ---------- 主体：章节索引 + 叙事 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 3.5vw, 48px);
  padding-block: clamp(34px, 5vw, 74px);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--about-line);
  background: var(--paper);
  font-size: 13px;
  color: var(--deep);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index__list a .mono {
  font-size: 11px;
  color: var(--gold-ink);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--gold);
  background: var(--gold-soft);
  color: var(--ink);
}

.page-about .about-index__foot {
  display: none;
  margin: 16px 0 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.page-about .chapter {
  padding-block: clamp(26px, 3.6vw, 42px);
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 24px;
}

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

.page-about .chapter__no {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold-ink);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-about .chapter h2 {
  margin: clamp(12px, 1.6vw, 18px) 0 clamp(12px, 1.6vw, 18px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.6vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--deep);
}

.page-about .chapter p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--deep);
}

.page-about .chapter p a {
  color: var(--gold-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .chapter p a:hover,
.page-about .chapter p a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .chapter h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--deep);
}

/* ---------- 要点行 ---------- */
.page-about .fact-row {
  display: grid;
  gap: 1px;
  margin: clamp(16px, 2vw, 22px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .fact-row li {
  background: var(--paper);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .fact-row b {
  font-size: 18px;
  color: var(--deep);
}

.page-about .fact-row span {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .fact-row--deep li {
  background: var(--deep);
  border-left: 2px solid var(--gold);
}

.page-about .fact-row--deep b {
  color: var(--gold-soft);
}

.page-about .fact-row--deep span {
  color: rgba(221, 242, 245, 0.72);
}

/* ---------- 联赛分区 ---------- */
.page-about .about-figure--zones {
  margin-top: clamp(16px, 2vw, 22px);
}

.page-about .zone-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .zone {
  display: grid;
  gap: 6px;
  padding: 14px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .zone__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold-ink);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .zone b {
  font-size: 15px;
  color: var(--deep);
}

.page-about .zone small {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .zone:hover,
.page-about .zone:focus-within {
  background: var(--deep);
  border-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .zone:hover b,
.page-about .zone:focus-within b {
  color: var(--snow);
}

.page-about .zone:hover small,
.page-about .zone:focus-within small {
  color: rgba(221, 242, 245, 0.72);
}

.page-about .zone:hover .zone__badge,
.page-about .zone:focus-within .zone__badge {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- 数据对照 ---------- */
.page-about .metric-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(16px, 2vw, 22px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .metric-grid li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 12px;
  padding: 13px 15px;
  background: var(--paper);
  transition: background 0.2s var(--ease);
}

.page-about .metric-grid li:hover {
  background: var(--gold-soft);
}

.page-about .metric-grid .mono {
  grid-row: span 2;
  padding-top: 2px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold-ink);
}

.page-about .metric-grid b {
  font-size: 15px;
  font-weight: 700;
  color: var(--deep);
}

.page-about .metric-grid small {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--slate);
}

/* ---------- 内容中心 ---------- */
.page-about .hub-grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(16px, 2vw, 22px);
}

.page-about .hub {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--gold);
  text-decoration: none;
  color: var(--deep);
  transition: box-shadow 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .hub__tag {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--gold-ink);
}

.page-about .hub p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--deep);
  max-width: none;
}

.page-about .hub__go {
  margin-top: auto;
  padding-top: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--deep);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .hub__go::after {
  content: " →";
  color: var(--gold-ink);
}

.page-about .hub:hover,
.page-about .hub:focus-visible {
  border-color: var(--gold);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.page-about .hub:hover .hub__go,
.page-about .hub:focus-visible .hub__go {
  color: var(--gold-ink);
}

/* ---------- 团队与流程 ---------- */
.page-about .about-figure--work {
  margin-top: clamp(16px, 2vw, 22px);
}

.page-about .process {
  display: grid;
  gap: 1px;
  margin-top: clamp(14px, 2vw, 20px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .process__step {
  background: var(--deep);
  padding: 18px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .process__step .mono {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .process__step h3 {
  color: var(--snow);
}

.page-about .process__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(221, 242, 245, 0.76);
  max-width: none;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  margin-top: clamp(16px, 3vw, 40px);
  padding: calc(3vw + 42px) 0 clamp(42px, 7vw, 76px);
  background:
    radial-gradient(60% 80% at 88% 10%, rgba(72, 214, 201, 0.2), transparent 60%),
    linear-gradient(150deg, var(--deep) 0%, var(--ink) 72%);
  color: var(--snow);
  clip-path: polygon(0 3vw, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-close__kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-close h2 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .zone-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
  }

  .page-about .hub-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .zone-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
    padding-right: 18px;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__list li + li {
    margin-top: 2px;
  }

  .page-about .about-index__list a {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 1px solid var(--about-line);
    background: transparent;
    padding: 9px 12px;
    border-radius: 0;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    border-left: 2px solid var(--gold);
    background: rgba(200, 161, 90, 0.12);
  }

  .page-about .about-index__foot {
    display: block;
  }

  .page-about .chapter p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .zone,
  .page-about .hub,
  .page-about .metric-grid li,
  .page-about .about-rail__list li,
  .page-about .about-hero .breadcrumb a {
    transition: none;
  }

  .page-about .zone:hover,
  .page-about .hub:hover,
  .page-about .hub:focus-visible {
    transform: none;
  }
}