.page-about {
  --about-hair: rgba(124, 157, 176, 0.26);
  --about-hair-soft: rgba(124, 157, 176, 0.16);
  --about-body: rgba(244, 247, 246, 0.8);
  --about-muted: rgba(244, 247, 246, 0.56);
  --about-panel: rgba(14, 46, 74, 0.55);
  position: relative;
  background: var(--deep-900);
  color: var(--paper-50);
  font-family: var(--font-sans);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(124, 157, 176, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124, 157, 176, 0.06) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
}

.page-about .about-shell {
  position: relative;
  z-index: 1;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 26px 18px 76px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 0 26px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--about-muted);
}

.page-about .crumb a {
  color: var(--cyan-200);
  text-decoration: none;
  transition: color 0.22s var(--ease-out);
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  color: var(--coral-500);
}

.page-about .crumb-sep {
  color: var(--grid-400);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--cyan-400);
}

.page-about h1 {
  margin: 0 0 18px;
  max-width: 22ch;
  font-size: clamp(1.9rem, 6.2vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper-50);
}

.page-about .about-lead {
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-tags,
.page-about .tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tag {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--about-hair);
  border-radius: 2px;
  background: rgba(55, 41, 107, 0.3);
  color: var(--cyan-200);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.page-about .tag-cyan {
  border-color: rgba(47, 216, 198, 0.42);
  color: var(--cyan-200);
}

.page-about .tag-list {
  margin-top: 18px;
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  padding: 9px;
  border: 1px solid var(--about-hair);
  background: var(--deep-700);
}

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 58%;
  height: 58%;
  border-right: 1px solid rgba(47, 216, 198, 0.4);
  border-bottom: 1px solid rgba(47, 216, 198, 0.4);
  pointer-events: none;
}

.page-about .about-hero-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 吸顶索引 ---------- */
.page-about .about-toc {
  position: sticky;
  top: var(--top-h);
  z-index: 6;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 44px 0 0;
  padding: 10px 0;
  background: rgba(7, 26, 43, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-label {
  flex: 0 0 auto;
  padding-right: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--grid-400);
}

.page-about .about-toc-list {
  flex: 0 0 auto;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
}

.page-about .about-toc-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  border: 1px solid var(--about-hair-soft);
  border-radius: 2px;
  color: var(--cyan-200);
  text-decoration: none;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: border-color 0.22s var(--ease-out), color 0.22s var(--ease-out),
    background 0.22s var(--ease-out);
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  border-color: var(--coral-500);
  background: rgba(255, 107, 74, 0.12);
  color: var(--paper-50);
}

.page-about .about-mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}

/* ---------- 档案段落 ---------- */
.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 34px 0;
  border-top: 1px solid var(--about-hair);
  scroll-margin-top: calc(var(--top-h) + 78px);
}

.page-about .about-sec--lead {
  border-top: 0;
}

.page-about .about-sec-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--cyan-400);
}

.page-about .about-sec-title {
  margin: 0 0 16px;
  font-size: clamp(1.3rem, 3.1vw, 1.88rem);
  line-height: 1.26;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--paper-50);
}

.page-about .about-sec-body p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-body);
}

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

.page-about .about-note {
  margin: 18px 0 0;
  padding: 15px 18px;
  max-width: 64ch;
  border-left: 3px solid var(--coral-500);
  border-radius: 1px;
  background: rgba(55, 41, 107, 0.42);
  color: var(--paper-50);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ---------- 岗位名册 ---------- */
.page-about .about-roster {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 3px 14px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .about-role-num {
  grid-row: span 2;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-role-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-role-desc {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .about-team-figure {
  margin: 26px 0 0;
  padding: 8px;
  border: 1px solid var(--about-hair);
  background: var(--deep-700);
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-stage-figure {
  margin: 24px 0 0;
  padding: 8px;
  border: 1px solid var(--about-hair);
  background: var(--deep-700);
}

.page-about .about-stage-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-timeline {
  margin: 26px 0 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stage {
  border-top: 1px solid var(--about-hair);
}

.page-about .about-stage-head {
  position: relative;
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 4px 16px;
  width: 100%;
  margin: 0;
  padding: 18px 42px 18px 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 0.22s var(--ease-out);
}

.page-about .about-stage-head:hover,
.page-about .about-stage-head:focus-visible {
  background: rgba(47, 216, 198, 0.06);
}

.page-about .about-stage-year {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.75;
  letter-spacing: 0.06em;
  color: var(--cyan-400);
}

.page-about .about-stage-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-stage-brief {
  grid-column: 2;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--about-muted);
}

.page-about .about-stage-head .expander-mark {
  position: absolute;
  right: 9px;
  top: 26px;
  width: 9px;
  height: 9px;
  overflow: hidden;
  font-size: 0;
  line-height: 0;
  color: transparent;
  border-right: 2px solid var(--cyan-400);
  border-bottom: 2px solid var(--cyan-400);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease-out), border-color 0.22s var(--ease-out);
}

.page-about .about-stage[data-open] .about-stage-head .expander-mark {
  transform: rotate(-135deg);
  border-color: var(--coral-500);
}

.page-about .about-stage-panel {
  padding: 0 0 20px;
}

.page-about .about-stage-panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  border: 1px solid var(--about-hair);
  background: var(--about-hair);
}

.page-about .about-stat {
  padding: 18px 16px;
  background: var(--deep-900);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.2vw, 1.95rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cyan-200);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 7px;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--about-muted);
}

.page-about .about-dotmap {
  position: relative;
  margin: 24px 0 0;
  height: 132px;
  border: 1px solid var(--about-hair);
  background-color: rgba(14, 46, 74, 0.5);
  background-image: radial-gradient(circle, rgba(47, 216, 198, 0.55) 1.2px, transparent 1.5px);
  background-size: 13px 13px;
  background-position: center;
}

.page-about .about-dotmap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 62% 80% at 44% 50%, transparent 28%, var(--deep-900) 88%);
  pointer-events: none;
}

.page-about .about-dotmap-note {
  margin: 10px 0 20px;
  max-width: 62ch;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---------- 协作与认可 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-partners li {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-hair);
  font-size: 0.95rem;
  line-height: 1.72;
  color: var(--about-body);
}

.page-about .about-partners .about-mono {
  padding-top: 4px;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-cta-title {
  margin: 0 0 8px;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  letter-spacing: -0.015em;
  line-height: 1.3;
  color: var(--paper-50);
}

.page-about .about-cta-lead {
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .about-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-links a {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 18px;
  border: 1px solid var(--about-hair-soft);
  border-radius: 2px;
  background: var(--about-panel);
  color: var(--paper-50);
  text-decoration: none;
  transition: border-color 0.22s var(--ease-out), background 0.22s var(--ease-out),
    transform 0.22s var(--ease-out);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  border-color: var(--coral-500);
  background: rgba(255, 107, 74, 0.1);
  transform: translateY(-2px);
}

.page-about .about-link-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .about-link-sub {
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--about-muted);
}

/* ---------- 渐进增强 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 680px) {
  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-role {
    grid-template-columns: 4.2rem 10rem minmax(0, 1fr);
    gap: 0 20px;
    align-items: baseline;
  }

  .page-about .about-role-num {
    grid-row: auto;
    padding-top: 0;
  }

  .page-about .about-stage-panel {
    padding: 0 0 22px calc(4rem + 16px);
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    padding: 46px 44px 104px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    column-gap: 52px;
    align-items: end;
  }

  .page-about .about-hero-figure {
    margin-bottom: -6px;
  }

  .page-about .about-sec {
    grid-template-columns: 118px minmax(0, 1fr);
    column-gap: 44px;
    padding: 44px 0;
  }

  .page-about .about-sec-index {
    position: sticky;
    top: calc(var(--top-h) + 78px);
    align-self: start;
    padding-top: 4px;
  }

  .page-about .about-toc {
    margin-top: 52px;
  }
}