.page-about {
  --about-axis-w: 56px;
  --about-axis-x: 28px;
  --about-pad: clamp(20px, 2.6vw, 30px);
  background: var(--c-void);
  color: var(--c-bone);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(14px, 2vw, 22px);
}

.page-about .about-crumb .crumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-mist);
}

.page-about .about-crumb .crumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-steel);
}

.page-about .about-crumb a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s ease, border-color .25s ease;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--c-bone);
}

/* ============ 首屏框景 ============ */

.page-about .about-hero {
  padding: clamp(20px, 3vw, 34px) 0 clamp(44px, 7vw, 88px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(26px, 4.4vw, 56px) clamp(20px, 3.6vw, 52px) clamp(30px, 4vw, 52px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(53, 227, 198, .10) 0%, rgba(53, 227, 198, 0) 52%),
    linear-gradient(160deg, rgba(20, 28, 49, .82) 0%, rgba(10, 16, 32, .62) 100%);
  box-shadow: var(--shadow);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 24px;
  height: 24px;
  border: 2px solid var(--c-cyan);
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--r-lg);
}

.page-about .about-hero__frame::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
  border-bottom-right-radius: var(--r-lg);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 62px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--c-bone);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--c-mist);
}

.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(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .about-facts__item {
  padding: 14px 16px;
  background: rgba(5, 8, 15, .72);
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-mist);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 24px;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
  line-height: 1;
}

.page-about .about-facts__unit {
  margin-left: 3px;
  font-size: 12px;
  color: var(--c-mist);
}

/* ============ 通用区块 ============ */

.page-about .about-head {
  max-width: 62em;
}

.page-about .about-h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -.018em;
  color: var(--c-bone);
}

.page-about .about-p {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.82;
  color: var(--c-mist);
}

.page-about .about-p--wide {
  max-width: 56em;
}

.page-about .about-list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-bone);
}

.page-about .about-list .num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  color: var(--c-orange);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-night);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--side img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--team img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__cap {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--c-mist);
  border-top: 1px solid var(--line-soft);
}

/* ============ 01 时间轴 ============ */

.page-about .about-timeline {
  padding: clamp(44px, 7vw, 92px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-figure--hero {
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-axis {
  position: relative;
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-axis::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: calc(var(--about-axis-x) - 1px);
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    var(--c-rock) 0%,
    var(--c-clay) 30%,
    var(--c-orange) 62%,
    var(--c-cyan) 100%);
  opacity: .85;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
  gap: 16px;
  padding-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 10px;
  left: calc(var(--about-axis-x) - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-void);
  border: 2px solid var(--c-orange);
  box-shadow: 0 0 0 4px rgba(10, 16, 32, .92);
  transition: border-color .3s ease, box-shadow .3s ease;
  z-index: 1;
}

.page-about .about-node:hover::before,
.page-about .about-node:focus-within::before {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(10, 16, 32, .92), 0 0 0 7px rgba(53, 227, 198, .18);
}

.page-about .about-node__year {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-top: 2px;
}

.page-about .about-node__year .num {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
  color: var(--c-mist);
  transition: color .3s ease;
}

.page-about .about-node:hover .about-node__year .num,
.page-about .about-node:focus-within .about-node__year .num {
  color: var(--c-cyan);
}

.page-about .about-node__era {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--c-rock);
}

.page-about .about-node__card {
  padding: var(--about-pad);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--glass);
  transition: transform .3s ease, background-color .3s ease, border-color .3s ease;
}

.page-about .about-node:hover .about-node__card,
.page-about .about-node:focus-within .about-node__card {
  transform: translateY(-4px);
  background: var(--glass-strong);
  border-color: var(--line);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.34;
  letter-spacing: -.012em;
  color: var(--c-bone);
}

.page-about .about-node__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .about-node__more {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-node__more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-orange);
  transition: color .25s ease;
}

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

.page-about .about-node__more summary::after {
  content: "+";
  font-size: 13px;
  line-height: 1;
}

.page-about .about-node__more[open] summary::after {
  content: "−";
}

.page-about .about-node__more summary:hover,
.page-about .about-node__more summary:focus-visible {
  color: var(--c-cyan);
}

.page-about .about-node__more p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-axis__note {
  margin: clamp(8px, 2vw, 18px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-axis__note a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 227, 198, .4);
  transition: border-color .25s ease;
}

.page-about .about-axis__note a:hover,
.page-about .about-axis__note a:focus-visible {
  border-bottom-color: var(--c-cyan);
}

/* ============ 02 数据来源 / 03 团队 ============ */

.page-about .about-band {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0;
  background:
    linear-gradient(180deg, rgba(59, 65, 72, .30) 0%, rgba(20, 28, 49, .40) 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-source,
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-source__text,
.page-about .about-team__text {
  min-width: 0;
}

.page-about .about-team {
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-rhythm {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-rhythm__item {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--c-steel);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(5, 8, 15, .5);
}

.page-about .about-rhythm__item p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-mist);
}

/* ============ 04 改版取舍 ============ */

.page-about .about-shift {
  display: grid;
  gap: 18px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .about-shift__col {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
}

.page-about .about-shift__col--before {
  background: rgba(59, 65, 72, .34);
}

.page-about .about-shift__col--after {
  background: linear-gradient(150deg, rgba(255, 106, 43, .12) 0%, rgba(53, 227, 198, .10) 100%);
  border-color: rgba(255, 106, 43, .34);
}

.page-about .about-shift__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
}

.page-about .about-shift__col--before .about-shift__tag {
  color: var(--c-mist);
}

.page-about .about-shift__col--after .about-shift__tag {
  color: var(--c-orange);
}

.page-about .about-shift__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-shift__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-bone);
}

.page-about .about-shift__list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-steel);
}

.page-about .about-shift__col--after .about-shift__list li::before {
  background: var(--c-cyan);
}

.page-about .about-shift__col--before .about-shift__list li {
  color: var(--c-mist);
}

/* ============ 05 规模 ============ */

.page-about .about-scale {
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .about-stat {
  padding: clamp(20px, 3vw, 28px);
  background: linear-gradient(170deg, rgba(20, 28, 49, .92) 0%, rgba(5, 8, 15, .88) 100%);
}

.page-about .about-stat__value {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .about-stat__unit {
  font-size: 13px;
  color: var(--c-mist);
}

.page-about .about-stat__label {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--c-bone);
}

.page-about .about-stat:nth-child(2n) .about-stat__value {
  color: var(--c-orange);
}

.page-about .about-stat__desc {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-scale__note {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--c-moss);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ============ 06 新赛季方向 ============ */

.page-about .about-next {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0 clamp(56px, 8vw, 104px);
  background:
    linear-gradient(180deg, rgba(10, 16, 32, 1) 0%, rgba(20, 28, 49, .86) 100%);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--glass);
  transition: transform .3s ease, background-color .3s ease, border-color .3s ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-within {
  transform: translateY(-4px);
  background: var(--glass-strong);
  border-color: rgba(53, 227, 198, .34);
}

.page-about .about-next__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-clay);
}

.page-about .about-next__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.3vw, 24px);
  letter-spacing: -.014em;
  color: var(--c-bone);
}

.page-about .about-next__text {
  margin: 12px 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-next__link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 227, 198, .38);
  transition: border-color .25s ease, color .25s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-bottom-color: var(--c-cyan);
  color: var(--c-bone);
}

.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(30px, 4.4vw, 52px);
  padding: clamp(22px, 3.4vw, 34px);
  border-radius: var(--r-lg);
  border: 1px solid rgba(255, 106, 43, .3);
  background:
    linear-gradient(120deg, rgba(255, 106, 43, .14) 0%, rgba(10, 16, 32, .9) 62%);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40em;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.7;
  color: var(--c-bone);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 焦点可见性兜底 ============ */

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

/* ============ 平板起 ============ */

@media (min-width: 720px) {
  .page-about .about-shift {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

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

/* ============ 桌面 ============ */

@media (min-width: 900px) {
  .page-about {
    --about-axis-w: 132px;
    --about-axis-x: 66px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

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

  .page-about .about-source {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-node {
    gap: clamp(24px, 3vw, 42px);
  }

  .page-about .about-node__year .num {
    font-size: 20px;
  }

  .page-about .about-node__card {
    max-width: 680px;
  }

  .page-about .about-node:nth-child(even) .about-node__card {
    margin-left: clamp(24px, 6vw, 96px);
    margin-top: 22px;
  }

  .page-about .about-node:nth-child(even) {
    padding-bottom: clamp(34px, 4vw, 56px);
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-next__card:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .about-next__card:nth-child(3) {
    margin-top: 56px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1160px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node__card,
  .page-about .about-next__card,
  .page-about .about-node::before,
  .page-about .about-node__year .num {
    transition: none;
  }

  .page-about .about-node:hover .about-node__card,
  .page-about .about-node:focus-within .about-node__card,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-within {
    transform: none;
  }
}