.page-about {
  padding-top: clamp(84px, 11vw, 124px);
  padding-bottom: clamp(64px, 9vw, 120px);
  background: var(--void);
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
}

.page-about .about-crumb {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--dust);
}

.page-about .breadcrumb-list > li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb-list > li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(169, 176, 214, 0.42);
}

.page-about .breadcrumb-link {
  color: var(--dust);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pulse);
}

.page-about .eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 12px rgba(53, 230, 208, 0.85);
}

.page-about h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5.2vw, 3.35rem);
  line-height: 1.14;
  letter-spacing: 0.05em;
  font-weight: 800;
  color: var(--silver);
}

.page-about .about-lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--dust);
}

.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 92px;
}

.page-about .hero-facts .mono {
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--pulse);
}

.page-about .hero-facts li > span:last-child {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--dust);
}

.page-about .about-hero-visual {
  margin: 0;
  overflow: hidden;
  background: linear-gradient(150deg, var(--violet), var(--void) 72%);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
}

.page-about .about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: 0.94;
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

/* ---------- 双栏：正文 + 索引轨道 ---------- */
.page-about .about-layout {
  margin-top: clamp(56px, 8vw, 104px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 4.5vw, 52px);
}

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

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

.page-about .index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  font-size: 13px;
  white-space: nowrap;
  color: var(--dust);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--pulse);
  border-color: var(--line-firm);
  background: rgba(53, 230, 208, 0.07);
}

.page-about .index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--rail);
}

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 7.6fr) minmax(0, 3.4fr);
    gap: clamp(40px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-body {
    order: 1;
  }

  .page-about .about-index {
    order: 2;
    position: sticky;
    top: clamp(88px, 10vw, 120px);
  }

  .page-about .index-title {
    margin-bottom: 14px;
  }

  .page-about .index-list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line-cool);
  }

  .page-about .index-link {
    display: flex;
    width: 100%;
    padding: 10px 0 10px 16px;
    margin-left: -1px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 14px;
    white-space: normal;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
  }

  .page-about .index-link:hover,
  .page-about .index-link:focus-visible {
    border-left-color: var(--pulse);
    background: linear-gradient(90deg, rgba(53, 230, 208, 0.1), rgba(53, 230, 208, 0));
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  margin-bottom: clamp(56px, 7vw, 104px);
  scroll-margin-top: clamp(88px, 11vw, 124px);
}

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

.page-about .sec-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .label {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--rail);
  background: rgba(108, 75, 214, 0.1);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.32rem, 3.4vw, 2rem);
  line-height: 1.28;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .prose {
  max-width: var(--measure);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  color: var(--dust);
}

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

.page-about .prose a {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 208, 0.4);
  transition: border-color 0.2s var(--ease);
}

.page-about .prose a:hover {
  border-bottom-color: var(--pulse);
}

.page-about .sec-foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  color: var(--dust);
}

.page-about .sec-foot a {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 208, 0.4);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--rail), rgba(108, 75, 214, 0.14));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 34px);
}

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

.page-about .tl-dot {
  position: absolute;
  left: -30px;
  top: 4px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 1px solid var(--line-firm);
  background: var(--void);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .tl-dot::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--rail);
  transition: background 0.25s var(--ease);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  border-color: var(--pulse);
  box-shadow: 0 0 0 4px rgba(53, 230, 208, 0.14);
}

.page-about .tl-item:hover .tl-dot::after,
.page-about .tl-item:focus-within .tl-dot::after {
  background: var(--pulse);
}

.page-about .tl-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--pulse);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.02rem, 2.4vw, 1.22rem);
  letter-spacing: 0.03em;
  font-weight: 700;
  color: var(--silver);
}

.page-about .tl-note {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--dust);
  opacity: 0.76;
  transition: opacity 0.25s var(--ease);
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  opacity: 1;
}

/* ---------- 团队 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(22px, 3.5vw, 34px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: linear-gradient(160deg, var(--indigo), var(--void));
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--dust);
}

.page-about .team-map {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line-soft);
  border-left: 1px solid var(--line-soft);
}

.page-about .team-node {
  padding: clamp(18px, 2.6vw, 26px);
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(27, 31, 75, 0.55), rgba(7, 10, 31, 0));
  transition: background 0.25s var(--ease);
}

.page-about .team-node:hover {
  background: linear-gradient(160deg, rgba(46, 30, 92, 0.78), rgba(7, 10, 31, 0));
}

.page-about .team-idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--rail);
}

.page-about .team-node h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--silver);
}

.page-about .team-node p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--dust);
}

@media (min-width: 760px) {
  .page-about .team-map {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 规模 ---------- */
.page-about .scale-list {
  display: grid;
  grid-template-columns: 1fr;
  margin: clamp(24px, 3.5vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .scale-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: clamp(14px, 2vw, 18px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .scale-num {
  position: relative;
  padding-bottom: 9px;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.6vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--silver);
}

.page-about .scale-num::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--pulse), rgba(53, 230, 208, 0));
}

.page-about .scale-label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--dust);
}

.page-about .scale-prose {
  margin-top: clamp(24px, 3.5vw, 36px);
}

@media (min-width: 820px) {
  .page-about .scale-list {
    grid-template-columns: 1fr 1fr;
    column-gap: clamp(28px, 4vw, 56px);
  }
}

/* ---------- 运营主体 ---------- */
.page-about .operator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 40px);
  align-items: start;
}

.page-about .operator-visual {
  margin: 0;
  overflow: hidden;
  background: linear-gradient(200deg, var(--teal), var(--void) 78%);
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.page-about .operator-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .operator-visual figcaption {
  padding: 12px 18px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dust);
}

@media (min-width: 900px) {
  .page-about .operator-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

.page-about .about-closing {
  margin: clamp(36px, 5vw, 64px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) clamp(16px, 3vw, 30px);
  border-left: 2px solid var(--pulse);
  background: linear-gradient(90deg, rgba(53, 230, 208, 0.08), rgba(53, 230, 208, 0));
  font-size: 15px;
  line-height: 1.85;
  color: var(--dust);
}

.page-about .about-closing a {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 230, 208, 0.4);
}

.page-about .about-closing a:hover {
  border-bottom-color: var(--pulse);
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}