.page-about {
  --about-tier-15: #2E9E6B;
  --about-tier-17: #1B6B4B;
  --about-tier-19: #0F4030;
  --about-rail-x: 9px;
  --about-rail-node: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.6rem, 5vw, 3rem) clamp(2.4rem, 6vw, 4.2rem);
  background:
    radial-gradient(115% 85% at 90% 4%, rgba(255, 74, 28, .24), transparent 58%),
    radial-gradient(80% 70% at 4% 96%, rgba(46, 158, 107, .18), transparent 62%),
    var(--ink);
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-hero .breadcrumbs-link {
  color: rgba(244, 245, 247, .68);
}

.page-about .about-hero .breadcrumbs-link:hover,
.page-about .about-hero .breadcrumbs-link:focus-visible {
  color: var(--gold);
}

.page-about .about-hero .breadcrumbs-current {
  color: var(--white);
}

.page-about .about-hero__stack {
  display: grid;
  gap: clamp(.7rem, 2vw, 1.1rem);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--gold);
}

.page-about .about-hero__title {
  display: grid;
  margin: 0;
  line-height: .94;
  color: var(--white);
}

.page-about .about-hero__title span:last-child {
  padding-left: clamp(0rem, 8vw, 4.5rem);
  color: var(--fox);
}

.page-about .about-hero__foot {
  display: grid;
  gap: 1rem;
  margin-top: clamp(.8rem, 2.4vw, 1.5rem);
  padding-top: clamp(1rem, 2.4vw, 1.6rem);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-hero__lede {
  margin: 0;
  color: rgba(244, 245, 247, .84);
}

.page-about .about-hero__meta {
  margin: 0;
  color: rgba(244, 245, 247, .58);
}

@media (min-width: 900px) {
  .page-about .about-hero__foot {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
    gap: clamp(2rem, 6vw, 5.5rem);
  }

  .page-about .about-hero__meta {
    text-align: right;
  }
}

/* ---------- 数据条 ---------- */
.page-about .about-band {
  background:
    linear-gradient(90deg, rgba(255, 74, 28, .16), transparent 42%),
    var(--ink-2);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  padding-block: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.1rem, 3vw, 2.2rem);
}

.page-about .about-band__grid .stat {
  min-width: 0;
  padding-left: clamp(.7rem, 1.6vw, 1rem);
  border-left: 2px solid rgba(255, 200, 61, .55);
}

.page-about .about-band__grid .stat-value {
  display: flex;
  align-items: baseline;
  gap: .18em;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1;
  color: var(--white);
  white-space: nowrap;
}

.page-about .about-band__grid .stat-value small {
  font-size: .34em;
  font-weight: 500;
  color: var(--gold);
}

.page-about .about-band__grid .stat-label {
  margin: .55rem 0 0;
  font-size: var(--fs-caption);
  letter-spacing: .06em;
  color: rgba(244, 245, 247, .74);
}

.page-about .about-band__note {
  margin: .35rem 0 0;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .02em;
  color: rgba(244, 245, 247, .45);
}

@media (min-width: 860px) {
  .page-about .about-band__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 三层梯队 ---------- */
.page-about .about-tiers__head {
  align-items: flex-end;
}

.page-about .about-tiers__intro {
  margin: clamp(1.4rem, 3.4vw, 2.2rem) 0 0;
  max-width: 62ch;
  color: var(--ink);
}

.page-about .about-tiers__grid {
  margin-top: clamp(1.8rem, 4.4vw, 3rem);
  gap: clamp(1rem, 2.6vw, 1.5rem);
}

.page-about .about-tier {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: clamp(1.2rem, 2.8vw, 1.75rem);
  border: 1px solid var(--line-light);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.page-about .about-tier::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: var(--tier-line, var(--grass));
}

.page-about .about-tier:hover {
  transform: translateY(-3px);
}

.page-about .about-tier--u15 { --tier-line: var(--about-tier-15); }
.page-about .about-tier--u17 { --tier-line: var(--about-tier-17); }
.page-about .about-tier--u19 { --tier-line: var(--about-tier-19); }

.page-about .about-tier__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  margin-bottom: clamp(.9rem, 2vw, 1.2rem);
}

.page-about .about-tier__code {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(1.4rem, 3.4vw, 1.9rem);
  letter-spacing: .02em;
  color: var(--tier-line, var(--grass));
}

.page-about .about-tier__specs {
  display: grid;
  gap: .85rem;
  margin: 0;
}

.page-about .about-tier__specs > div {
  display: grid;
  gap: .2rem;
  padding-top: .8rem;
  border-top: 1px dashed var(--line-light);
}

.page-about .about-tier__specs > div:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-tier__specs dt {
  font-size: var(--fs-caption);
  letter-spacing: .1em;
  color: var(--neutral);
}

.page-about .about-tier__specs dd {
  margin: 0;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 教练与保障 ---------- */
.page-about .about-staff {
  background:
    radial-gradient(85% 65% at 8% 0%, rgba(46, 158, 107, .3), transparent 60%),
    linear-gradient(158deg, var(--grass) 0%, var(--grass-shadow) 100%);
  color: var(--fog);
}

.page-about .about-staff .t-h2,
.page-about .about-staff .eyebrow {
  color: var(--white);
}

.page-about .about-staff .eyebrow {
  color: var(--gold);
}

.page-about .about-staff__layout {
  display: grid;
  gap: clamp(1.8rem, 4.4vw, 3.2rem);
}

.page-about .about-staff__lead {
  max-width: 56ch;
  margin: clamp(1rem, 2.4vw, 1.5rem) 0 0;
  line-height: 1.8;
  color: rgba(244, 245, 247, .82);
}

.page-about .about-tally {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-tally__group {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  max-width: 100%;
}

.page-about .about-dot {
  display: block;
  width: 13px;
  height: 13px;
  border-radius: 4px;
}

.page-about .about-tally__group--tech .about-dot { background: var(--mint); }
.page-about .about-tally__group--med .about-dot { background: var(--gold); }
.page-about .about-tally__group--data .about-dot { background: var(--electric); }

.page-about .about-tally__note {
  margin: .7rem 0 0;
  font-size: var(--fs-caption);
  color: rgba(244, 245, 247, .6);
}

.page-about .about-roles {
  display: grid;
  gap: 1rem;
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
}

.page-about .about-role {
  padding: .95rem 0 0;
  border-top: 1px solid rgba(244, 245, 247, .16);
}

.page-about .about-role__name {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--white);
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .82rem;
  padding: .18em .55em;
  border-radius: var(--pill);
  background: rgba(255, 200, 61, .16);
  color: var(--gold);
}

.page-about .about-role__desc {
  margin: .45rem 0 0;
  max-width: 52ch;
  font-size: .94rem;
  line-height: 1.78;
  color: rgba(244, 245, 247, .76);
}

.page-about .about-staff__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-staff__figure .media-frame__caption {
  color: rgba(244, 245, 247, .7);
}

@media (min-width: 960px) {
  .page-about .about-staff__layout {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: start;
  }

  .page-about .about-staff__figure {
    margin-top: clamp(1rem, 3vw, 2.6rem);
  }
}

/* ---------- 青训基地 ---------- */
.page-about .about-base__head {
  align-items: flex-end;
}

.page-about .about-base__wide {
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-base__body {
  display: grid;
  gap: clamp(1.4rem, 3.4vw, 2.4rem);
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-base__copy {
  display: grid;
  gap: 1rem;
  max-width: 62ch;
}

.page-about .about-base__copy p {
  margin: 0;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-base__small {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 900px) {
  .page-about .about-base__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-base__small {
    margin-top: clamp(1.2rem, 3.5vw, 3rem);
  }
}

/* ---------- 选材与晋升 ---------- */
.page-about .about-scout {
  background:
    radial-gradient(95% 80% at 96% 10%, rgba(91, 124, 255, .2), transparent 58%),
    var(--ink);
}

.page-about .about-scout .t-h2,
.page-about .about-scout .t-h3 {
  color: var(--white);
}

.page-about .about-scout .eyebrow {
  color: var(--gold);
}

.page-about .about-scout__grid {
  display: grid;
  gap: clamp(1.8rem, 4.4vw, 3rem);
}

.page-about .about-scout__panel--alt {
  padding: clamp(1.2rem, 3vw, 1.8rem);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  background: rgba(244, 245, 247, .04);
}

.page-about .about-scout__lead {
  max-width: 52ch;
  margin: clamp(1rem, 2.4vw, 1.5rem) 0 0;
  line-height: 1.8;
  color: rgba(244, 245, 247, .8);
}

.page-about .about-scout__panel--alt p {
  margin: 1rem 0 0;
  max-width: 52ch;
  line-height: 1.8;
  color: rgba(244, 245, 247, .78);
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(1.4rem, 3.4vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: .9rem;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .9rem;
  align-items: start;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--line-dark);
}

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

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .85rem;
  font-weight: 700;
  color: var(--fox);
  padding-top: .2em;
}

.page-about .about-step__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(244, 245, 247, .84);
}

.page-about .about-scout__links {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 1.5rem 0 0;
}

.page-about .about-scout__links .btn {
  color: var(--white);
  border-color: rgba(244, 245, 247, .38);
}

.page-about .about-scout__links .btn:hover,
.page-about .about-scout__links .btn:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
}

@media (min-width: 920px) {
  .page-about .about-scout__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
}

/* ---------- 时间线 ---------- */
.page-about .about-history__head {
  align-items: flex-end;
}

.page-about .about-history__list {
  position: relative;
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(.7rem, 1.8vw, 1.1rem);
}

.page-about .about-history__list::before {
  content: "";
  position: absolute;
  left: var(--about-rail-x);
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--fox) 0%, rgba(255, 74, 28, .35) 55%, rgba(255, 74, 28, .08) 100%);
}

.page-about .about-tl {
  position: relative;
  padding-left: 34px;
  min-width: 0;
}

.page-about .about-tl__node {
  position: absolute;
  left: calc(var(--about-rail-x) - 5px);
  top: 16px;
  width: var(--about-rail-node);
  height: var(--about-rail-node);
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--grass);
  border: 3px solid var(--fog);
  z-index: 1;
}

.page-about .about-tl__box {
  background: var(--white);
  border: 1px solid var(--line-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-tl__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .45rem .9rem;
  padding: clamp(.85rem, 2vw, 1.1rem) clamp(1rem, 2.4vw, 1.35rem);
  cursor: pointer;
  list-style: none;
}

.page-about .about-tl__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: .08em;
  color: var(--fox-deep);
}

.page-about .about-tl__box[open] .about-tl__summary::after {
  content: "收起";
}

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

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: .02em;
  color: var(--fox-deep);
}

.page-about .about-tl__title {
  font-weight: 700;
  font-size: var(--fs-h3);
  color: var(--ink);
}

.page-about .about-tl__desc {
  margin: 0;
  padding: 0 clamp(1rem, 2.4vw, 1.35rem) clamp(.95rem, 2.4vw, 1.25rem);
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--neutral);
}

@media (min-width: 760px) {
  .page-about .about-tl {
    padding-left: 52px;
  }

  .page-about .about-tl__node {
    top: 18px;
  }
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  background:
    linear-gradient(120deg, rgba(255, 74, 28, .18) 0%, transparent 46%),
    var(--ink-2);
}

.page-about .about-close__inner {
  display: grid;
  gap: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-close__line {
  margin: 0;
  max-width: 30ch;
  font-weight: 800;
  font-size: clamp(1.35rem, 3.4vw, 2.1rem);
  line-height: 1.32;
  color: var(--white);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .about-close__actions .btn {
  color: var(--white);
  border-color: rgba(244, 245, 247, .38);
}

.page-about .about-close__actions .btn--primary {
  color: var(--white);
  border-color: var(--fox);
}

@media (min-width: 900px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(2rem, 6vw, 5rem);
  }
}

/* ---------- 移动端防溢出兜底 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__title span:last-child {
    padding-left: 0;
  }

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

  .page-about .about-band__grid .stat-value {
    font-size: clamp(1.7rem, 9vw, 2.3rem);
  }
}

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

.page-about .about-staff__figure img,
.page-about .about-base__wide img,
.page-about .about-base__small img {
  width: 100%;
}

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

  .page-about .about-tier:hover {
    transform: none;
  }
}