.page-about {
  --about-line: var(--line);
  --about-rail-w: 200px;
  display: block;
  background: var(--void);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 40px 0 64px;
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-line) 1px, transparent 1px);
  background-size: 84px 84px;
  opacity: .34;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 86%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 86%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -110px;
  right: -140px;
  width: min(560px, 68vw);
  height: 360px;
  background: linear-gradient(118deg, rgba(0, 229, 208, .22), rgba(124, 92, 255, .14) 52%, rgba(5, 7, 14, 0) 82%);
  clip-path: polygon(20% 0, 100% 0, 100% 100%, 0 74%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-hero-main h1 {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.15;
  letter-spacing: .035em;
  color: var(--ink);
  max-width: 15em;
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.95;
  color: var(--mist);
}

.page-about .about-hero-side {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .hero-year {
  font-family: var(--font-mono);
  font-size: clamp(52px, 12vw, 92px);
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--amber);
  text-shadow: 0 0 42px rgba(255, 176, 32, .28);
}

.page-about .hero-year-note {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .hero-ticks {
  display: flex;
  gap: 6px;
  margin-top: 12px;
}

.page-about .hero-ticks i {
  display: block;
  width: 3px;
  height: 16px;
  background: var(--cyan);
  opacity: .28;
}

.page-about .hero-ticks i:nth-child(3) { opacity: .9; }
.page-about .hero-ticks i:nth-child(4) { opacity: .6; }
.page-about .hero-ticks i:nth-child(5) { opacity: .42; }

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 56px 0 88px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero-side {
    border-top: 0;
    border-left: 1px solid var(--about-line);
    padding-top: 0;
    padding-left: 28px;
  }
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-bottom: 72px;
}

.page-about .about-rail {
  display: none;
}

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

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-rail {
    display: block;
  }

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

.page-about .about-rail .toc-title {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
  margin: 0 0 14px;
}

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

.page-about .about-rail .toc-link {
  display: block;
  padding: 9px 0 9px 14px;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--mist);
  text-decoration: none;
  border-left: 1px solid var(--about-line);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-rail .toc-link:hover,
.page-about .about-rail .toc-link:focus-visible {
  color: var(--ink);
  border-left-color: var(--violet);
}

.page-about .about-rail .toc-link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  --accent: var(--cyan);
  position: relative;
  padding: 40px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .about-section:nth-of-type(2) { --accent: var(--amber); }
.page-about .about-section:nth-of-type(3) { --accent: var(--cyan); }
.page-about .about-section:nth-of-type(4) { --accent: var(--violet); }
.page-about .about-section:nth-of-type(5) { --accent: var(--magenta); }
.page-about .about-section:nth-of-type(6) { --accent: var(--amber); }

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  margin-bottom: 18px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--accent);
  opacity: .95;
}

.page-about .about-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.3;
  letter-spacing: .05em;
  color: var(--ink);
}

.page-about .about-lead {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-text {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-text a,
.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, .34);
}

.page-about .about-text a:hover,
.page-about .about-note a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 44em;
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 6px 0 26px;
}

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

.page-about .about-figure--team {
  margin-top: 30px;
  margin-bottom: 4px;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
  margin: 0 -18px;
  padding-left: 18px;
  padding-right: 18px;
}

.page-about .timeline {
  display: flex;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  min-width: 100%;
  width: max-content;
}

.page-about .timeline-node {
  position: relative;
  flex: 0 0 250px;
  padding-top: 22px;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--about-line);
}

.page-about .timeline-node::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--violet);
  transform: rotate(45deg);
}

.page-about .timeline-node:nth-child(4n + 2)::after { background: var(--amber); }
.page-about .timeline-node:nth-child(4n + 3)::after { background: var(--cyan); }
.page-about .timeline-node:nth-child(4n)::after { background: var(--magenta); }

.page-about .timeline-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .02em;
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 对照表 ---------- */

.page-about .about-table-wrap {
  margin: 4px 0 0;
}

.page-about .about-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table-caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 14px;
  text-align: left;
  border-bottom: 1px solid var(--about-line);
  color: var(--ink);
  line-height: 1.7;
  vertical-align: top;
}

.page-about .about-table thead th {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
  border-bottom: 1px solid var(--cyan);
}

.page-about .about-table tbody th[scope="row"] {
  font-weight: 500;
  color: var(--mist);
  width: 22%;
  white-space: nowrap;
}

.page-about .about-table tbody tr:hover {
  background: rgba(0, 229, 208, .04);
}

/* ---------- 包体复算：双栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-split-main {
  min-width: 0;
}

.page-about .about-split-aside {
  margin: 0;
}

.page-about .about-split-aside img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: 40px;
    align-items: start;
  }
}

/* ---------- 团队条形图 ---------- */

.page-about .team-bars {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .team-row {
  --accent: var(--cyan);
  --pct: 50%;
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .team-name {
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--ink);
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--accent);
}

.page-about .team-track {
  position: relative;
  height: 6px;
  background: var(--panel);
  border: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .team-fill {
  display: block;
  height: 100%;
  width: var(--pct, 0%);
  background: var(--accent);
  transform-origin: left center;
  animation: about-bar .7s var(--ease) both;
}

@keyframes about-bar {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

.page-about .team-role {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 46em;
}

@media (min-width: 860px) {
  .page-about .team-bars {
    gap: 18px;
  }
}

/* ---------- 规模数据块 ---------- */

.page-about .scale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 8px 0 26px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .scale-card {
  background: var(--panel);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .scale-card .stat-value {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -.02em;
}

.page-about .scale-card .stat-value abbr {
  font-size: 15px;
  text-decoration: none;
  margin-left: 2px;
  color: var(--mist);
}

.page-about .scale-card .stat-label {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--ink);
}

.page-about .scale-card .scale-note {
  margin: 4px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
}

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

@media (min-width: 1040px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  margin-top: 30px;
  padding: 24px 20px;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(100deg, rgba(0, 229, 208, .07), rgba(11, 18, 32, .2) 60%);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 24px 28px;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .team-fill {
    animation: none;
  }

  .page-about .about-rail .toc-link {
    transition: none;
  }
}