.page-about {
  --about-rail: 208px;
  --about-num: rgba(245, 242, 234, .22);
  padding-bottom: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}
.page-about .breadcrumb a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.page-about .breadcrumb span[aria-hidden] { margin: 0 8px; color: var(--line-strong); }

/* ---------- 首屏框景 ---------- */
.page-about .about-hero { padding: 18px 0 34px; }
.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .about-hero__frame {
  position: relative;
  border: 2px solid var(--line-strong);
  background: linear-gradient(158deg, rgba(20, 28, 58, .88), rgba(10, 16, 38, .62));
  padding: 30px 22px 26px 30px;
}
.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
}
.page-about .about-hero__frame::before {
  top: -2px; left: -2px;
  border-top: 3px solid var(--orange);
  border-left: 3px solid var(--orange);
}
.page-about .about-hero__frame::after {
  bottom: -2px; right: -2px;
  border-bottom: 3px solid var(--cyan);
  border-right: 3px solid var(--cyan);
}
.page-about .about-hero__ruler {
  position: absolute;
  left: 8px;
  top: 30px;
  bottom: 26px;
  width: 5px;
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 1px, transparent 1px 11px);
}
.page-about .about-hero__title {
  margin: 14px 0 14px;
  font-size: clamp(30px, 6vw, 56px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.015em;
  color: var(--paper);
}
.page-about .slant,
.page-about .about-chapter__num { transform: skewX(-4deg); }
.page-about .about-hero__lead {
  margin: 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--paper);
}
.page-about .about-hero__facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed var(--line-strong);
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--muted);
}
.page-about .about-hero__facts .mono {
  color: var(--cyan);
  font-size: 15px;
  margin-right: 6px;
}
.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 240px;
  object-fit: cover;
}
.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--ink);
  background: var(--amber);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-layout {
  display: block;
  margin-top: 10px;
}
.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding: 14px 0 6px;
  margin-bottom: 26px;
}
.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--muted);
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-strong);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.page-about .about-rail__link .mono { color: var(--graphite); }
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  background: rgba(255, 107, 44, .08);
  border-left-color: var(--orange);
  border-color: var(--line-strong);
}
.page-about .about-rail__link:hover .mono { color: var(--orange); }
.page-about .about-rail__meta {
  display: none;
  margin: 22px 0 0;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--muted);
  line-height: 1.9;
}

.page-about .about-chapters { display: flex; flex-direction: column; }
.page-about .about-chapter {
  padding: 30px 0 28px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 110px;
}
.page-about .about-chapter:first-child { border-top: 2px solid var(--line-strong); }
.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}
.page-about .about-chapter__num {
  display: inline-block;
  position: relative;
  padding-left: 10px;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-num);
  transition: color .2s var(--ease);
}
.page-about .about-chapter__num::before {
  content: "";
  position: absolute;
  left: 0; top: 2px; bottom: 2px;
  width: 3px;
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 2px, transparent 2px 6px);
}
.page-about .about-chapter:hover .about-chapter__num,
.page-about .about-chapter:focus-within .about-chapter__num { color: var(--paper); }
.page-about .about-chapter__heading { min-width: 0; }
.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-size: clamp(21px, 3.6vw, 31px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-chapter__body {
  margin-top: 18px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
}
.page-about .about-chapter__body p { margin: 0 0 14px; }
.page-about .about-chapter__body p:last-child { margin-bottom: 0; }
.page-about .about-chapter__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 230, 200, .4);
}
.page-about .about-chapter__body a:hover { color: var(--amber); border-bottom-color: var(--amber); }
.page-about .about-chapter__body--after { margin-top: 20px; }
.page-about .about-chapter__foot {
  margin: 22px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cyan);
}

/* ---------- 配图 ---------- */
.page-about .about-banner {
  margin: 22px 0 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}
.page-about .about-banner img { display: block; width: 100%; height: auto; }

/* ---------- 团队 Bento ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-team__block {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  transition: transform .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-about .about-team__block:hover,
.page-about .about-team__block:focus-within {
  transform: translateY(-3px);
  background: var(--ink-3);
  border-color: var(--line-strong);
  border-top-color: var(--orange);
}
.page-about .about-team__block--research { border-top-color: var(--cyan); }
.page-about .about-team__block--research:hover { border-top-color: var(--cyan); }
.page-about .about-team__block--tech { border-top-color: var(--purple); }
.page-about .about-team__block--tech:hover { border-top-color: var(--purple); }
.page-about .about-team__count {
  font-family: var(--mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}
.page-about .about-team__block--research .about-team__count { color: var(--cyan); }
.page-about .about-team__block--tech .about-team__count { color: var(--purple); }
.page-about .about-team__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 服务内容卡片 ---------- */
.page-about .about-scope {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-scope__item {
  padding: 16px;
  background: rgba(20, 28, 58, .55);
  border: 1px solid var(--glass-line);
  backdrop-filter: blur(4px);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-scope__item:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}
.page-about .about-scope__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-scope__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 9px;
  background: var(--cyan);
  transform: skewX(-14deg);
}
.page-about .about-scope__item p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin-top: 22px;
  padding: 12px 0 4px;
  background:
    linear-gradient(rgba(43, 48, 59, .35), rgba(10, 16, 38, 0)) ,
    repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 64px);
}
.page-about .about-timeline svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.page-about .tl-axis { stroke: var(--line-strong); stroke-width: 2; }
.page-about .tl-line {
  fill: none;
  stroke: var(--purple);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.page-about .tnode { cursor: help; outline: none; }
.page-about .tnode__dot {
  stroke: var(--ink);
  stroke-width: 2;
  transition: stroke .18s var(--ease), stroke-width .18s var(--ease);
}
.page-about .tnode__dot--orange { fill: var(--orange); }
.page-about .tnode__dot--cyan { fill: var(--cyan); }
.page-about .tnode__dot--purple { fill: var(--purple); }
.page-about .tnode__dot--amber { fill: var(--amber); }
.page-about .tnode:hover .tnode__dot,
.page-about .tnode:focus-visible .tnode__dot {
  stroke: var(--amber);
  stroke-width: 4;
}
.page-about .tl-year {
  font-family: var(--mono);
  font-size: 15px;
  fill: var(--muted);
  text-anchor: middle;
}
.page-about .about-timeline__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-timeline__legend li {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 12px;
  border-left: 2px solid var(--line-strong);
  background: rgba(20, 28, 58, .4);
  font-size: 13.8px;
  line-height: 1.7;
  color: var(--muted);
  transition: border-color .18s var(--ease), background .18s var(--ease), color .18s var(--ease);
}
.page-about .about-timeline__legend li:hover {
  border-left-color: var(--purple);
  background: rgba(20, 28, 58, .8);
  color: var(--paper);
}
.page-about .about-timeline__year {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--orange);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-partners__card {
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.page-about .about-partners__card:hover,
.page-about .about-partners__card:focus-within {
  transform: translateY(-3px);
  border-color: var(--orange);
  box-shadow: var(--shadow);
}
.page-about .about-partners__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .about-partners__card p {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  margin-top: 42px;
  padding: 34px 0 46px;
  border-top: 2px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(20, 28, 58, .7), rgba(10, 16, 38, 0));
}
.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: center;
}
.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .about-cta__text {
  margin: 0 0 14px;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}
.page-about .about-cta__mail { margin: 0; }
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__inner { grid-template-columns: 7fr 5fr; gap: 22px; }
  .page-about .about-hero__facts { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
  .page-about .about-team { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .page-about .about-team__block--edit { grid-column: span 5; min-height: 196px; }
  .page-about .about-team__block--research { grid-column: span 3; min-height: 150px; margin-top: 26px; }
  .page-about .about-team__block--tech { grid-column: span 4; min-height: 172px; margin-top: 12px; }
  .page-about .about-scope { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-partners { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-timeline__legend { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-cta__inner { grid-template-columns: 1.4fr 1fr; }
  .page-about .about-cta__actions { justify-content: flex-end; }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 108px;
    margin-bottom: 0;
    border-top: 0;
    padding-top: 0;
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-about .about-rail__link { width: 100%; white-space: normal; }
  .page-about .about-rail__meta { display: block; }
  .page-about .about-chapter { padding: 38px 0 34px; }
  .page-about .about-chapter__head { grid-template-columns: 64px minmax(0, 1fr); gap: 18px; }
  .page-about .about-chapter__num { font-size: 34px; }
  .page-about .about-chapter__body { margin-left: 82px; }
  .page-about .about-chapter__foot { margin-left: 82px; }
  .page-about .about-banner { margin-left: 82px; }
  .page-about .about-team { margin-left: 82px; }
  .page-about .about-scope { margin-left: 82px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-scope__item:last-child { grid-column: span 2; }
  .page-about .about-partners { margin-left: 82px; }
  .page-about .about-timeline { margin-left: 82px; }
  .page-about .about-timeline__legend { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__block,
  .page-about .about-scope__item,
  .page-about .about-partners__card,
  .page-about .about-chapter__num { transition: none; }
  .page-about .about-team__block:hover,
  .page-about .about-scope__item:hover,
  .page-about .about-partners__card:hover { transform: none; }
}