.page-about {
  --spine: 72px;
  --about-glass: rgba(18, 41, 74, 0.55);
  --about-body-text: rgba(232, 238, 246, 0.82);
  background: var(--navy-900);
  color: var(--ice);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--topbar-h) + 4rem) 0 clamp(2.5rem, 7vw, 5rem);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(1100px 560px at 82% -14%, rgba(242, 193, 78, 0.14), transparent 62%),
    linear-gradient(180deg, rgba(18, 41, 74, 0.9) 0%, rgba(8, 23, 38, 0) 72%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -38%;
  width: 120%;
  height: 62%;
  pointer-events: none;
  background: linear-gradient(32deg, rgba(47, 163, 107, 0.07) 0%, rgba(47, 163, 107, 0) 55%);
}

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(1.2rem, 3vw, 2rem);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold);
}

.page-about .crumb-sep {
  margin: 0 0.5em;
  color: var(--line);
}

.page-about .hero-window {
  position: relative;
  z-index: 1;
  padding: clamp(1.4rem, 4vw, 3.25rem);
  border: 1px solid var(--line);
  background: linear-gradient(158deg, rgba(18, 41, 74, 0.88) 0%, rgba(8, 23, 38, 0.92) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.page-about .hero-tick {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 0 solid var(--gold);
  pointer-events: none;
}

.page-about .hero-tick--tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; }
.page-about .hero-tick--tr { top: -1px; right: -1px; border-top-width: 2px; border-right-width: 2px; }
.page-about .hero-tick--bl { bottom: -1px; left: -1px; border-bottom-width: 2px; border-left-width: 2px; }
.page-about .hero-tick--br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; }

.page-about .hero-range {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-h1 {
  margin: 0.55rem 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.95rem, 6vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ice);
  max-width: 20ch;
}

.page-about .about-lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(0.96rem, 1.5vw, 1.08rem);
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  border-top: 1px solid var(--line);
}

.page-about .hero-figure {
  padding: 1rem 0.2rem 0.2rem;
  border-left: 1px solid var(--line);
}

.page-about .hero-figure:nth-child(odd) {
  border-left: 0;
  padding-left: 0;
}

.page-about .hero-figure:nth-child(even) {
  padding-left: 1.1rem;
}

.page-about .hero-figure:nth-child(n + 3) {
  border-top: 1px solid var(--line);
}

.page-about .hero-figure-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-figure-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

/* ============ 正文骨架 ============ */

.page-about .about-flow {
  position: relative;
}

.page-about .about-block {
  padding: clamp(2rem, 6vw, 3.5rem) 0;
  border-top: 1px solid rgba(44, 74, 114, 0.55);
}

.page-about .block-rail {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.85rem;
}

.page-about .rail-year {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  text-transform: uppercase;
  white-space: nowrap;
}

.page-about .block-title {
  margin: 0.35rem 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 3.2vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ice);
  max-width: 26ch;
}

.page-about .block-body > p {
  margin: 0.95rem 0 0;
  max-width: 44ch;
  line-height: 1.85;
  color: var(--about-body-text);
}

.page-about .block-body > p a {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 193, 78, 0.4);
}

.page-about .block-body > p a:hover,
.page-about .block-body > p a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about .block-body .media-frame {
  margin: clamp(1.4rem, 4vw, 2.2rem) 0 0;
}

/* ============ 三个小组 ============ */

.page-about .squad-visual {
  border: 1px solid var(--line);
}

.page-about .squad-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .squad {
  position: relative;
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  background: linear-gradient(165deg, rgba(18, 41, 74, 0.8) 0%, rgba(8, 23, 38, 0.7) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.page-about .squad-head {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 1.15rem 1.2rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .squad-head::marker {
  content: "";
}

.page-about .squad-no {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .squad-name {
  flex: 1 1 auto;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--ice);
}

.page-about .squad-count {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .squad[open] .squad-head {
  border-bottom: 1px solid rgba(44, 74, 114, 0.6);
}

.page-about .squad-body {
  padding: 0.9rem 1.2rem 1.25rem;
}

.page-about .squad-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .squad-list li {
  position: relative;
  padding-left: 1rem;
  margin-top: 0.6rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

.page-about .squad-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--gold);
}

/* ============ 流程步骤 ============ */

.page-about .flow-visual {
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .flow-visual .media-frame {
  border: 1px solid var(--line);
}

.page-about .steps {
  margin: clamp(1.6rem, 4vw, 2.4rem) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
  position: relative;
}

.page-about .steps::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 22%, var(--line) 100%);
}

.page-about .step {
  position: relative;
}

.page-about .step + .step {
  margin-top: 0.4rem;
}

.page-about .step::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 15px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--navy-900);
  border: 1px solid var(--gold);
}

.page-about .step details {
  border-bottom: 1px solid rgba(44, 74, 114, 0.45);
  padding-bottom: 0.85rem;
}

.page-about .step-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.8rem;
  padding: 0.7rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .step-head::marker {
  content: "";
}

.page-about .step-no {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .step-name {
  flex: 1 1 auto;
  font-size: 1.02rem;
  color: var(--ice);
}

.page-about .step-tag {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .step-text {
  margin: 0;
  max-width: 44ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--about-body-text);
}

/* ============ 赛季时间线 ============ */

.page-about .timeline-visual {
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
  border: 1px solid var(--line);
}

.page-about .tl-scroll {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .tl-scroll::-webkit-scrollbar {
  height: 4px;
}

.page-about .tl-scroll::-webkit-scrollbar-track {
  background: rgba(44, 74, 114, 0.3);
}

.page-about .tl-scroll::-webkit-scrollbar-thumb {
  background: var(--line);
}

.page-about .tl-track {
  position: relative;
  display: flex;
  gap: clamp(0.9rem, 2.5vw, 1.8rem);
  margin: 0;
  padding: 0 0 1.4rem;
  list-style: none;
}

.page-about .tl-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 6px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--line) 16%, var(--line) 78%, rgba(44, 74, 114, 0) 100%);
}

.page-about .tl-node {
  position: relative;
  flex: 0 0 clamp(228px, 72vw, 292px);
  scroll-snap-align: start;
  padding-right: 0.5rem;
  outline-offset: 6px;
}

.page-about .tl-marker {
  display: block;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--navy-900);
  margin-bottom: 1.15rem;
}

.page-about .tl-range {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-head {
  margin: 0.5rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--ice);
}

.page-about .tl-text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

.page-about .tl-more {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .tl-more > p {
  overflow: hidden;
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--mist);
  border-left: 1px solid var(--line);
  padding-left: 0;
}

.page-about .tl-node:hover .tl-more > p,
.page-about .tl-node:focus .tl-more > p,
.page-about .tl-node:focus-within .tl-more > p {
  padding: 0.6rem 0 0 0.7rem;
}

.page-about .tl-node:hover .tl-more,
.page-about .tl-node:focus .tl-more,
.page-about .tl-node:focus-within .tl-more {
  grid-template-rows: 1fr;
  opacity: 1;
}

.page-about .tl-node:hover .tl-marker,
.page-about .tl-node:focus .tl-marker,
.page-about .tl-node:focus-within .tl-marker {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 193, 78, 0.16);
}

/* ============ 团队数据 ============ */

.page-about .team-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.4rem, 4vw, 2.2rem);
  background: rgba(44, 74, 114, 0.55);
  border: 1px solid rgba(44, 74, 114, 0.55);
}

.page-about .figure {
  background: var(--navy-900);
  padding: 1.05rem 1rem;
}

.page-about .figure-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

.page-about .figure:nth-child(2) .figure-num { color: var(--gold); }
.page-about .figure:nth-child(3) .figure-num { color: var(--green); }

.page-about .figure-label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  line-height: 1.5;
  color: var(--mist);
}

/* ============ 结尾行动区 ============ */

.page-about .about-cta {
  margin-top: clamp(2rem, 6vw, 3.5rem);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  background: linear-gradient(140deg, rgba(18, 41, 74, 0.85) 0%, rgba(8, 23, 38, 0.9) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: clamp(1.6rem, 5vw, 3rem);
}

.page-about .cta-title {
  margin: 0.5rem 0 0.7rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.4rem, 4vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ice);
  max-width: 22ch;
}

.page-about .cta-text {
  margin: 0;
  max-width: 42ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--about-body-text);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

/* ============ 响应式 ============ */

@media (min-width: 600px) {
  .page-about .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .hero-figure:nth-child(n + 3) {
    border-top: 0;
  }

  .page-about .hero-figure {
    padding-left: 1.15rem;
    padding-right: 0.6rem;
  }

  .page-about .hero-figure:nth-child(odd) {
    padding-left: 1.15rem;
  }

  .page-about .hero-figure:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .team-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 901px) {
  .page-about .about-flow::before {
    content: "";
    position: absolute;
    left: calc(var(--spine) - 1px);
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(180deg, rgba(44, 74, 114, 0) 0%, var(--line) 4%, var(--line) 92%, rgba(44, 74, 114, 0) 100%);
    pointer-events: none;
  }

  .page-about .about-block {
    display: grid;
    grid-template-columns: var(--spine) minmax(0, 1fr);
    column-gap: clamp(1.5rem, 3vw, 3rem);
    padding: clamp(2.5rem, 5vw, 4rem) 0;
  }

  .page-about .block-rail {
    position: relative;
    display: block;
    margin: 0;
    padding: 0.4rem 1.6rem 0 0;
    text-align: right;
  }

  .page-about .rail-year {
    display: block;
    font-size: 0.68rem;
    line-height: 1.6;
    white-space: normal;
  }

  .page-about .block-rail::after {
    content: "";
    position: absolute;
    right: -5px;
    top: 0.62rem;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--navy-900);
    border: 1px solid var(--gold);
  }

  .page-about .squad-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: clamp(0.9rem, 2vw, 1.4rem);
  }

  .page-about .squad:nth-child(2) {
    margin-top: 2.4rem;
  }

  .page-about .squad:nth-child(3) {
    margin-top: 1.1rem;
  }

  .page-about .block-body > p,
  .page-about .step-text,
  .page-about .cta-text {
    max-width: 62ch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-block {
    grid-template-columns: var(--spine) minmax(0, 1fr);
  }

  .page-about .tl-node {
    flex: 0 0 300px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-more,
  .page-about .tl-more > p,
  .page-about .tl-marker {
    transition: none;
  }
}