.page-about {
  --about-idx-w: 216px;
  color: var(--ink-text);
}

.page-about .breadcrumb {
  padding-block: 18px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--mist);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

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

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(22px, 3vw, 34px) clamp(32px, 5vw, 60px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.22;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(226, 58, 46, 0.35), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about h1 {
  margin: 0 0 18px;
  font-size: clamp(26px, 5.4vw, 44px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 0 0 26px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-text);
}

.page-about .fact-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .fact-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--ink-2);
}

.page-about .fact-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 档案卡 ---------- */
.page-about .about-card {
  position: relative;
  margin: 0;
  padding: 12px;
  border: var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(17, 28, 51, 0.94), rgba(11, 18, 32, 0.88));
  box-shadow: 0 24px 48px -32px rgba(0, 0, 0, 0.95);
}

.page-about .about-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 12px;
  width: 56px;
  height: 2px;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-about .about-stamp {
  position: absolute;
  top: 22px;
  right: 22px;
  z-index: 2;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--gold);
  border-radius: 2px;
}

.page-about .about-card img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: calc(var(--radius) - 1px);
}

.page-about .about-card-note {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 4px 2px;
  font-size: 13px;
}

.page-about .about-card-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-about .about-card-val {
  color: var(--paper);
  font-weight: 600;
}

/* ---------- 左索引 + 右正文 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  padding-block: clamp(28px, 4vw, 52px) clamp(40px, 6vw, 72px);
}

.page-about .about-index {
  min-width: 0;
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 14px;
  min-height: 40px;
  border: var(--hair);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

.page-about .about-index-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gold);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--paper);
  border-color: var(--red);
  background: rgba(226, 58, 46, 0.1);
  outline: none;
}

.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(26px, 3.6vw, 40px);
  border-top: var(--hair);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .sec-head {
  margin-bottom: 20px;
}

.page-about .sec-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--red);
}

.page-about .sec-title {
  margin: 0;
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.3;
  font-weight: 700;
  color: var(--paper);
}

.page-about .sec-lede {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-text {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-text);
}

.page-about .about-text:last-child {
  margin-bottom: 0;
}

/* ---------- 双栏目 ---------- */
.page-about .duo-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .duo-card {
  position: relative;
  padding: 20px 18px 18px;
  border: var(--hair);
  border-radius: var(--radius);
  background: rgba(17, 28, 51, 0.62);
}

.page-about .duo-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 18px;
  width: 40px;
  height: 2px;
  background: var(--gold);
}

.page-about .duo-card--red::before {
  background: var(--red);
}

.page-about .duo-tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint);
  text-transform: uppercase;
}

.page-about .duo-title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .duo-text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-text);
}

.page-about .duo-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.page-about .duo-link:hover,
.page-about .duo-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
  outline: none;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 20px;
  padding: 10px;
  border: var(--hair);
  border-radius: var(--radius);
  background: rgba(11, 18, 32, 0.6);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 2px;
}

.page-about .figure-caption {
  padding: 10px 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-card {
  position: relative;
  padding: 18px 16px;
  border: var(--hair);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(17, 28, 51, 0.8), rgba(11, 18, 32, 0.7));
  transition: border-color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--red);
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -26px rgba(226, 58, 46, 0.7);
}

.page-about .team-no {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--gold);
  border-radius: 2px;
}

.page-about .team-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-text {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-text);
}

.page-about .team-duties {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-duties li {
  padding: 4px 9px;
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--mint);
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* ---------- 阶段轨道 ---------- */
.page-about .track {
  position: relative;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .track::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 11px;
  width: 1px;
  background: linear-gradient(180deg, var(--red), var(--gold) 58%, var(--line));
}

.page-about .track-item {
  position: relative;
  padding-left: 42px;
  padding-bottom: 12px;
}

.page-about .track-item:last-child {
  padding-bottom: 0;
}

.page-about .track-node {
  position: absolute;
  top: 4px;
  left: 0;
  width: 23px;
  height: 23px;
  display: grid;
  place-items: center;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--gold);
}

.page-about .track-panel {
  border: var(--hair);
  border-radius: var(--radius);
  background: rgba(17, 28, 51, 0.55);
  transition: border-color 0.16s ease;
}

.page-about .track-panel[open] {
  border-color: var(--line);
  background: rgba(17, 28, 51, 0.85);
}

.page-about .track-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .track-summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold);
}

.page-about .track-panel[open] .track-summary::after {
  content: "–";
}

.page-about .track-summary:hover .track-name,
.page-about .track-summary:focus-visible .track-name {
  color: var(--gold);
}

.page-about .track-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  transition: color 0.15s ease;
}

.page-about .track-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .track-body {
  padding: 0 16px 16px;
}

.page-about .track-body p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-text);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 20px;
  background: var(--line);
  border: var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .eco-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 16px;
  background: var(--ink-2);
  border-left: 2px solid var(--red);
}

.page-about .eco-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .eco-val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(22px, 3.4vw, 34px);
  border: var(--hair);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(226, 58, 46, 0.16), transparent 58%),
    rgba(17, 28, 51, 0.85);
}

.page-about .cta-title {
  margin: 0 0 10px;
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .cta-text {
  margin: 0 0 18px;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-text);
}

.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .fact-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .duo-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-text {
    font-size: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .about-index-list {
    display: block;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-index-list li + li {
    margin-top: 2px;
  }

  .page-about .about-index-link {
    min-height: 0;
    padding: 9px 0 9px 14px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    background: transparent;
    border-left-color: var(--red);
    color: var(--paper);
  }

  .page-about .about-index-link:focus-visible {
    outline: 2px solid var(--mint);
    outline-offset: 2px;
  }

  .page-about .about-figure--wide {
    margin-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .duo-link,
  .page-about .track-name,
  .page-about .about-index-link {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}