.page-about {
  --about-rail: 116px;
  --about-dot: 14px;
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(900px 520px at 12% -6%, rgba(30, 74, 63, .55), transparent 62%),
    linear-gradient(180deg, rgba(8, 33, 28, .9), rgba(11, 43, 36, 0) 42%);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: clamp(22px, 3vw, 34px) 0 clamp(6px, 1.4vw, 14px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .09em;
  color: var(--neutral);
}
.page-about .crumb {
  color: var(--neutral);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.page-about .crumb:hover { color: var(--lime); border-bottom-color: var(--lime); }
.page-about .crumb:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}
.page-about .crumb--current { color: var(--paper); }
.page-about .crumb-sep { color: var(--line); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  align-items: end;
  padding: clamp(14px, 2.6vw, 30px) 0 clamp(26px, 4vw, 48px);
}
.page-about .about-hero__text { max-width: 66ch; }
.page-about .about-hero h1 {
  margin: 14px 0 22px;
  font-size: clamp(36px, 6.6vw, 80px);
  font-weight: 200;
  line-height: 1.06;
  letter-spacing: -.012em;
  color: var(--paper);
  text-wrap: balance;
}
.page-about .about-hero .lede {
  margin: 0 0 20px;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.82;
  color: var(--paper);
  opacity: .9;
  max-width: 60ch;
}
.page-about .about-hero .prose {
  margin: 0;
  max-width: 60ch;
  color: var(--neutral);
  font-size: 16px;
  line-height: 1.82;
}

.page-about .about-hero__stamp {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 24px;
  border: 2px solid var(--line);
  background: linear-gradient(150deg, rgba(30, 74, 63, .9), rgba(11, 43, 36, .35));
  box-shadow: 9px 9px 0 rgba(0, 0, 0, .45);
}
.page-about .about-hero__stamp-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.4vw, 48px);
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}
.page-about .about-hero__stamp-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .13em;
  line-height: 1.7;
  color: var(--neutral);
}

.page-about .about-hero__media { margin-top: clamp(6px, 1.6vw, 18px); }
.page-about .about-hero__media .media { border-radius: 0; }

/* ---------- 时间轴 ---------- */
.page-about .about-time {
  position: relative;
  isolation: isolate;
  padding: clamp(52px, 8vw, 108px) 0 clamp(56px, 8vw, 112px);
  border-top: 1px solid rgba(198, 255, 61, .16);
}
.page-about .about-time__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  opacity: .14;
  pointer-events: none;
}
.page-about .about-time__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  max-width: none;
}

.page-about .about-chart {
  margin: clamp(28px, 4vw, 48px) 0 0;
}
.page-about .about-chart svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 190px;
}
.page-about .about-chart figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  line-height: 1.8;
  color: var(--neutral);
}

.page-about .about-track {
  list-style: none;
  margin: clamp(34px, 5vw, 62px) 0 0;
  padding: 0;
}
.page-about .about-node {
  position: relative;
  padding: 20px 0 20px 30px;
}
.page-about .about-node::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(198, 255, 61, .42) 0 5px,
    transparent 5px 11px
  );
}
.page-about .about-node:first-child::after { top: 42px; }
.page-about .about-node:last-child::after { bottom: auto; height: 42px; }
.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 35px;
  width: 13px;
  height: 13px;
  border: 2px solid var(--lime);
  border-radius: 50%;
  background: var(--ink);
  z-index: 1;
}

.page-about .about-node__year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__fold { display: block; }
.page-about .about-node__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 20px;
  list-style: none;
  cursor: pointer;
  border: 2px solid var(--line);
  background: linear-gradient(135deg, rgba(17, 21, 20, .96), rgba(30, 74, 63, .32));
  transition: border-color var(--t-fast), box-shadow var(--t-fast), transform var(--t-fast);
}
.page-about .about-node__head::-webkit-details-marker { display: none; }
.page-about .about-node__head:hover {
  border-color: rgba(198, 255, 61, .6);
  box-shadow: 7px 7px 0 rgba(0, 0, 0, .5);
  transform: translate(-2px, -2px);
}
.page-about .about-node__head:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}
.page-about .about-node__fold[open] > .about-node__head {
  border-color: rgba(198, 255, 61, .68);
}
.page-about .about-node__name {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .about-node__cue {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
}
.page-about .about-node__cue::before,
.page-about .about-node__cue::after {
  content: "";
  position: absolute;
  background: var(--lime);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.page-about .about-node__cue::before { left: 0; top: 7px; width: 16px; height: 2px; }
.page-about .about-node__cue::after { left: 7px; top: 0; width: 2px; height: 16px; }
.page-about .about-node__fold[open] > .about-node__head .about-node__cue::after {
  transform: scaleY(0);
  opacity: 0;
}
.page-about .about-node__body {
  padding: 2px 20px 20px;
  border: 2px solid rgba(198, 255, 61, .68);
  border-top: 0;
  background: rgba(8, 33, 28, .62);
}
.page-about .about-node__body p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .9;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(52px, 8vw, 104px) 0;
  border-top: 1px solid rgba(198, 255, 61, .16);
  background: linear-gradient(180deg, rgba(17, 21, 20, .55), transparent 70%);
}
.page-about .about-team__body {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 48px);
  align-items: start;
}
.page-about .about-team__media {
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}
.page-about .about-team__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 20px 20px 22px;
  border: 2px solid var(--line);
  background: rgba(11, 43, 36, .5);
  transition: border-color var(--t-fast), background-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}
.page-about .about-step:hover,
.page-about .about-step:focus-visible {
  border-color: rgba(198, 255, 61, .62);
  background: rgba(30, 74, 63, .6);
  box-shadow: 7px 7px 0 rgba(0, 0, 0, .45);
  transform: translate(-2px, -2px);
  outline: none;
}
.page-about .about-step:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}
.page-about .about-step__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  padding-top: 4px;
  color: var(--lime);
}
.page-about .about-step__text h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--paper);
}
.page-about .about-step__text p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--neutral);
}

.page-about .about-team__note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 36px);
  padding: 20px 22px;
  border: 2px dashed rgba(198, 255, 61, .42);
  background: rgba(8, 33, 28, .45);
}
.page-about .about-team__note p {
  margin: 0;
  flex: 1 1 320px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper);
  opacity: .88;
}

/* ---------- 青训 ---------- */
.page-about .about-youth {
  padding: clamp(52px, 8vw, 104px) 0;
  border-top: 1px solid rgba(198, 255, 61, .16);
}
.page-about .about-youth__head { max-width: 72ch; }

.page-about .about-youth__bands {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
}
.page-about .about-band {
  padding: 24px 22px 26px;
  border: 2px solid var(--line);
  border-left: 6px solid var(--lime);
  background: linear-gradient(120deg, rgba(30, 74, 63, .55), rgba(11, 43, 36, .35));
  transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-fast);
}
.page-about .about-band:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .45);
  border-color: rgba(198, 255, 61, .58);
}
.page-about .about-band__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 14px;
}
.page-about .about-band__age {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: .05em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .about-band__kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--neutral);
}
.page-about .about-band p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper);
  opacity: .88;
}

.page-about .about-youth__metrics {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(22px, 3vw, 34px);
  border: 2px solid var(--line);
  background: rgba(8, 33, 28, .6);
}
.page-about .about-youth__metrics-title {
  margin: 0 0 18px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 500;
  color: var(--paper);
}
.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-metrics__item {
  padding: 13px 16px;
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--paper);
  transition: background-color var(--t-fast), color var(--t-fast);
}
.page-about .about-metrics__item:hover {
  background: var(--teal);
  color: var(--lime);
}
.page-about .about-youth__metrics-note {
  margin: 18px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--neutral);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: clamp(52px, 8vw, 104px) 0;
  border-top: 1px solid rgba(198, 255, 61, .16);
  background: linear-gradient(180deg, rgba(17, 21, 20, .5), transparent 78%);
}
.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
}
.page-about .about-partner {
  padding: 26px 22px 28px;
  border: 2px solid var(--line);
  background: rgba(11, 43, 36, .5);
  transition: border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}
.page-about .about-partner:hover {
  border-color: rgba(255, 194, 75, .55);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .45);
}
.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}
.page-about .about-partner h3 {
  margin: 12px 0 12px;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 500;
  color: var(--paper);
}
.page-about .about-partner p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--neutral);
}
.page-about .about-partners__cta {
  margin: clamp(24px, 3vw, 34px) 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--neutral);
}
.page-about .about-partners__cta a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, .5);
  transition: border-color var(--t-fast), color var(--t-fast);
}
.page-about .about-partners__cta a:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}
.page-about .about-partners__cta a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* ---------- 做事方式 ---------- */
.page-about .about-creed {
  padding: clamp(52px, 8vw, 104px) 0;
  border-top: 1px solid rgba(198, 255, 61, .16);
}
.page-about .about-creed__grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 48px);
}
.page-about .about-creed__item {
  position: relative;
  padding: 30px 24px 28px;
  border: 2px solid var(--line);
  background:
    linear-gradient(160deg, rgba(30, 74, 63, .5), rgba(11, 43, 36, .28));
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .4);
  transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-fast);
}
.page-about .about-creed__item:hover {
  transform: translate(-3px, -3px);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, .5);
  border-color: rgba(198, 255, 61, .55);
}
.page-about .about-creed__mark {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lime);
  margin-bottom: 16px;
}
.page-about .about-creed__item h3 {
  margin: 0 0 12px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 500;
  line-height: 1.45;
  color: var(--paper);
}
.page-about .about-creed__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--neutral);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(46px, 7vw, 88px) 0 clamp(60px, 9vw, 110px);
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(17, 21, 20, .75), rgba(11, 43, 36, .3));
}
.page-about .about-next__inner {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  align-items: end;
}
.page-about .about-next__lead { max-width: 58ch; }
.page-about .about-next__lead h2 {
  margin: 12px 0 14px;
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 200;
  line-height: 1.16;
  letter-spacing: -.008em;
  color: var(--paper);
}
.page-about .about-next__lead p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--neutral);
}
.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-next__actions .btn {
  white-space: nowrap;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-youth__bands {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-youth__bands > :last-child {
    grid-column: 1 / -1;
  }
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-partners__grid > :last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 820px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(200px, 236px);
  }
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.2fr) auto;
  }

  .page-about .about-node {
    padding: 26px 0 26px var(--about-rail);
    display: block;
  }
  .page-about .about-node::after {
    left: calc(var(--about-rail) - 16px);
    top: 0;
    bottom: 0;
  }
  .page-about .about-node:first-child::after { top: 40px; }
  .page-about .about-node:last-child::after { height: 40px; bottom: auto; }
  .page-about .about-node::before {
    left: calc(var(--about-rail) - 23px);
    top: 34px;
  }
  .page-about .about-node__year {
    position: absolute;
    left: 0;
    top: 30px;
    width: calc(var(--about-rail) - 42px);
    margin: 0;
    text-align: right;
    font-size: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
  .page-about .about-youth__head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    gap: clamp(24px, 3vw, 48px);
    align-items: end;
    max-width: none;
  }
  .page-about .about-youth__head .section__index { grid-column: 1 / -1; }
  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partners__grid > :last-child {
    grid-column: auto;
  }
  .page-about .about-creed__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-youth__bands {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-youth__bands > :last-child {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__head,
  .page-about .about-step,
  .page-about .about-band,
  .page-about .about-partner,
  .page-about .about-creed__item,
  .page-about .crumb {
    transition: none;
  }
  .page-about .about-node__head:hover,
  .page-about .about-step:hover,
  .page-about .about-band:hover,
  .page-about .about-partner:hover,
  .page-about .about-creed__item:hover {
    transform: none;
  }
}