.page-about {
  --ab-pad: clamp(16px, 4vw, 40px);
  --ab-radius: 3px;
  --ab-shadow: 0 1px 0 rgba(51, 239, 210, 0.06);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
  position: relative;
}

.page-about .container {
  width: var(--frame-w);
  margin-inline: auto;
  padding-inline: var(--ab-pad);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: clamp(14px, 2.4vw, 22px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist-dim);
  text-transform: uppercase;
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .breadcrumb span[aria-hidden] {
  margin: 0 8px;
  color: var(--line);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--cyan-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 60px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .year-mark {
  position: absolute;
  top: 2%;
  right: -4%;
  font-family: var(--font-display);
  font-size: clamp(88px, 24vw, 300px);
  font-weight: 600;
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: rgba(51, 239, 210, 0.045);
  -webkit-text-stroke: 1px rgba(43, 69, 92, 0.85);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  grid-template-columns: 1fr;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(30px, 6.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .about-hero-lead {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--mist);
  max-width: 60ch;
  margin: 0 0 28px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-hero-stats .stat {
  background: var(--ink-900);
  padding: clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.2vw, 44px);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero-stats .stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-dim);
  line-height: 1.5;
}

.page-about .about-hero-media {
  margin: 0;
}

.page-about .about-hero-media .media-frame {
  border: 1px solid var(--line);
  box-shadow: var(--ab-shadow);
}

.page-about .data-note {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-dim);
  line-height: 1.7;
  margin: 10px 0 0;
}

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

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding: clamp(44px, 7vw, 96px) 0;
}

.page-about .section-head {
  max-width: 76ch;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(24px, 3.5vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  color: var(--paper);
}

.page-about .section-lead {
  font-size: clamp(14px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--mist);
  margin: 0;
  max-width: 68ch;
}

.page-about .card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: clamp(16px, 2.4vw, 24px);
  border-radius: var(--ab-radius);
}

.page-about .card-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.25;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(51, 239, 210, 0.4);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 年份带 ---------- */
.page-about .year-band {
  background:
    linear-gradient(180deg, rgba(18, 43, 65, 0.55) 0%, rgba(10, 26, 40, 0) 42%),
    var(--ink-900);
}

.page-about .year-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 14px;
  margin-bottom: 10px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-chip {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 10px 16px;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  cursor: pointer;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .year-chip:hover,
.page-about .year-chip:focus-visible {
  color: var(--paper);
  border-color: var(--cyan-soft);
}

.page-about .year-chip.is-active,
.page-about .year-chip[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .season-live {
  margin-bottom: clamp(20px, 3vw, 32px);
  color: var(--cyan-soft);
}

.page-about .season-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .season-card {
  border: 0;
  border-radius: 0;
  background: var(--ink-900);
  padding: clamp(16px, 2.2vw, 22px);
  min-width: 0;
  transition: background 0.3s var(--ease);
}

.page-about .season-card:hover {
  background: var(--ink-800);
}

.page-about .season-card-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .season-card-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .band-figure {
  margin: clamp(30px, 4vw, 52px) 0 0;
}

.page-about .band-figure .media-frame {
  border: 1px solid var(--line);
  overflow: hidden;
}

/* ---------- 暖纸区块 ---------- */
.page-about .paper-block {
  background: var(--paper);
  color: var(--ink-text);
}

.page-about .paper-block .section-title,
.page-about .paper-block .card-title {
  color: var(--ink-text);
}

.page-about .paper-block .section-kicker {
  color: #0E7A6A;
}

.page-about .paper-block .section-lead,
.page-about .paper-block .data-note {
  color: #4A5A66;
}

.page-about .paper-block a.text-link {
  color: #0E7A6A;
  border-bottom-color: rgba(14, 122, 106, 0.42);
}

/* ---------- 球队索引 ---------- */
.page-about .index-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 44px);
  align-items: start;
}

.page-about .index-tree {
  position: relative;
  padding-left: 22px;
  border-left: 1px solid var(--paper-line);
}

.page-about .index-node {
  position: relative;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .index-node:first-child {
  border-top: 1px solid var(--paper-line);
}

.page-about .index-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .node-dot {
  position: absolute;
  left: -27px;
  top: 25px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid #0E7A6A;
  box-sizing: content-box;
}

.page-about .index-node[open] .node-dot {
  background: #0E7A6A;
}

.page-about .node-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2vw, 22px);
  color: var(--ink-text);
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .node-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #0E7A6A;
  white-space: nowrap;
}

.page-about .index-node-body {
  padding: 0 0 22px;
}

.page-about .index-node-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #2B3A46;
  max-width: 68ch;
}

.page-about .index-cta {
  margin-top: 24px;
}

.page-about .index-media {
  margin: 0;
}

.page-about .index-media .media-frame {
  border: 1px solid var(--paper-line);
  background: var(--paper-2);
  overflow: hidden;
}

/* ---------- 条目构成 ---------- */
.page-about .entry-types {
  background: var(--ink-900);
}

.page-about .entry-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .entry-card {
  border: 0;
  border-radius: 0;
  background: var(--ink-900);
  min-width: 0;
}

.page-about .entry-num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: rgba(51, 239, 210, 0.22);
  margin: 0 0 12px;
}

.page-about .entry-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 归档节奏 ---------- */
.page-about .rhythm {
  background: var(--ink-800);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 48px);
}

.page-about .rhythm-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.2vw, 24px);
  margin: 0 0 18px;
  color: var(--cyan-soft);
}

.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .rhythm-list li {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 14px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .rhythm-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .rhythm-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--odds);
}

.page-about .flow-steps {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: none;
}

.page-about .flow-steps li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  align-items: start;
}

.page-about .flow-index {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 24px;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.page-about .flow-steps strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--paper);
  margin-bottom: 4px;
}

.page-about .flow-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 维护团队 ---------- */
.page-about .crew-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 28px);
  margin-bottom: clamp(24px, 3vw, 40px);
}

.page-about .crew-card {
  border-top: 2px solid #0E7A6A;
  padding-top: 18px;
}

.page-about .crew-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #2B3A46;
}

.page-about .crew-note {
  background: var(--paper-2);
  border: 1px solid var(--paper-line);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .crew-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: #1D2A34;
  max-width: 68ch;
}

/* ---------- 延伸阅读 ---------- */
.page-about .keep-reading {
  background: var(--ink-900);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--ink-900);
  color: inherit;
  text-decoration: none;
  min-width: 0;
  transition: background 0.28s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--ink-800);
}

.page-about .next-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0;
}

.page-about .next-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .next-go {
  margin-top: auto;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
  border-top: 1px solid var(--line);
}

/* ---------- 浮动锚点 ---------- */
.page-about .about-backto {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(12px, 3vw, 28px);
  z-index: 30;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 10px 14px;
  color: var(--ink-900);
  background: var(--cyan);
  border-radius: 999px;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

.page-about .about-backto:hover,
.page-about .about-backto:focus-visible {
  background: var(--cyan-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .season-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: start;
  }

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

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

  .page-about .index-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }

  .page-about .index-media {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .rhythm-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

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

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

@media (min-width: 1100px) {
  .page-about .entry-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-about .rhythm-list li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-about .about-hero-actions .btn {
    width: 100%;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-chip,
  .page-about .season-card,
  .page-about .next-card {
    transition: none;
  }
}