.page-about {
  --about-pad: clamp(52px, 7vw, 100px);
  --about-gap: clamp(18px, 2.4vw, 28px);
  background: var(--ink);
  color: var(--silver);
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(18px, 2.4vw, 30px) clamp(40px, 5vw, 64px);
  border-bottom: 2px solid var(--line);
  background:
    repeating-linear-gradient(115deg, rgba(27, 58, 102, 0.55) 0 1px, transparent 1px 58px),
    radial-gradient(120% 85% at 88% -10%, rgba(0, 229, 255, 0.16), transparent 62%),
    var(--ink);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: clamp(22px, 3vw, 40px);
}

.page-about .breadcrumb a {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .breadcrumb__sep {
  color: var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  align-items: end;
}

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

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 14px 0 0;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__index {
  border: 2px solid var(--line);
  background: rgba(15, 37, 71, 0.88);
  box-shadow: var(--shadow-hard);
  padding: 18px 18px 14px;
}

.page-about .about-hero__index-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-hero__index-list a {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 9px 4px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.16s ease, border-color 0.16s ease;
}

.page-about .about-hero__index-list a:hover,
.page-about .about-hero__index-list a:focus-visible {
  background: rgba(22, 50, 92, 0.9);
  border-left-color: var(--cyan);
}

.page-about .about-hero__index-list .yr {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-hero__index-list .lbl {
  font-size: 13px;
  color: var(--silver);
  line-height: 1.5;
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .about-hero__facts li {
  background: var(--ink-2);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__facts strong {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-hero__facts span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mute);
  line-height: 1.5;
}

/* ---------- 小节头 ---------- */
.page-about .about-head {
  margin-bottom: clamp(24px, 3vw, 40px);
  max-width: 46rem;
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 12px 0 0;
}

.page-about .about-head__lede {
  margin: 14px 0 0;
  color: var(--silver);
  line-height: 1.8;
  font-size: 15px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding-block: var(--about-pad);
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-origin__text h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.12;
  color: var(--paper);
  margin: 12px 0 18px;
  letter-spacing: -0.015em;
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  line-height: 1.85;
  font-size: 15px;
  color: var(--silver);
}

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

.page-about .media-frame {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-3);
  overflow: hidden;
  display: block;
}

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

.page-about .media-frame__cap {
  display: block;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mute);
  border-top: 1px solid var(--line);
  background: var(--ink);
  line-height: 1.6;
}

.page-about .media-frame--diagonal {
  clip-path: polygon(0 0, 100% 0, 100% 88%, 88% 100%, 0 100%);
}

.page-about .about-origin__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--orange);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-block: var(--about-pad);
  background:
    repeating-linear-gradient(115deg, rgba(27, 58, 102, 0.4) 0 1px, transparent 1px 72px),
    var(--ink);
  border-bottom: 2px solid var(--line);
}

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

.page-about .tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-bottom: clamp(22px, 2.6vw, 30px);
}

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

.page-about .tl__year {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .tl__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .tl__year small {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mute);
}

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

.page-about .tl__body {
  border: 2px solid var(--line);
  border-left: 4px solid var(--ink-3);
  background: rgba(15, 37, 71, 0.72);
  padding: 18px 18px 16px;
  margin-top: 12px;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .tl__body h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.3;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .tl__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .tl__brief {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--mute);
}

.page-about .tl__item:target .tl__body {
  border-color: var(--orange);
  border-left-color: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-pad);
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__banner {
  margin-bottom: var(--about-gap);
}

.page-about .about-team__stats {
  display: grid;
  gap: var(--about-gap);
  margin-bottom: clamp(26px, 3.4vw, 44px);
}

.page-about .stat {
  position: relative;
  border: 2px solid var(--line);
  background: var(--ink);
  padding: 20px 18px;
  overflow: hidden;
}

.page-about .stat::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 96px;
  height: 96px;
  background-image: radial-gradient(rgba(0, 229, 255, 0.55) 1.4px, transparent 1.5px);
  background-size: 10px 10px;
  opacity: 0.5;
  pointer-events: none;
}

.page-about .stat__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 5vw, 54px);
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.page-about .stat__unit {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  margin-left: 4px;
}

.page-about .stat p {
  position: relative;
  z-index: 1;
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .about-team__cols {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-team__main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

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

.page-about .note {
  border: 2px solid var(--line);
  border-left: 4px solid var(--orange);
  background: var(--ink);
  padding: 16px 18px;
}

.page-about .note__sum {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--orange);
  cursor: pointer;
  list-style: none;
}

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

.page-about .note p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .note p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
}

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

/* ---------- 实验室 ---------- */
.page-about .about-lab {
  padding-block: var(--about-pad);
  background: var(--ink);
  border-bottom: 2px solid var(--line);
}

.page-about .about-lab__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-lab__meter {
  border: 2px solid var(--line);
  background: linear-gradient(160deg, rgba(0, 229, 255, 0.14), transparent 62%), var(--ink-3);
  box-shadow: var(--shadow-hard);
  padding: 22px 20px;
}

.page-about .about-lab__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(48px, 8vw, 76px);
  line-height: 0.95;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-lab__meter p {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .lab-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .lab-row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.16s ease;
}

.page-about .lab-row:hover {
  background: rgba(22, 50, 92, 0.55);
}

.page-about .lab-row__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-about .lab-row__desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .lab-row__tag {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--deep);
  background: var(--cyan);
  padding: 3px 8px;
  margin-top: 4px;
}

.page-about .about-lab__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-top: 18px;
  border-top: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 60rem;
}

.page-about .about-lab__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding-block: var(--about-pad);
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 46px);
}

.page-about .about-partners__text h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 12px 0 18px;
}

.page-about .about-partners__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-partners__text p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, 0.45);
}

.page-about .cloud {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .cloud__item {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  padding: 7px 11px;
  border: 1px solid var(--line);
  color: var(--silver);
  background: var(--ink);
  transition: border-color 0.16s ease, color 0.16s ease;
}

.page-about .cloud__item:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .cloud__item--hot {
  border-color: rgba(255, 107, 44, 0.6);
  color: var(--orange);
}

.page-about .about-partners__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  padding-block: var(--about-pad);
  background: var(--ink);
  border-bottom: 2px solid var(--line);
}

.page-about .about-reach__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .reach-card {
  border: 2px solid var(--line);
  background: var(--ink-2);
  padding: 20px 18px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .reach-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .reach-card__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 4.6vw, 48px);
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.page-about .reach-card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--cyan);
  margin: 8px 0 10px;
  letter-spacing: 0.01em;
}

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

.page-about .reach-card--accent {
  background: linear-gradient(155deg, rgba(255, 107, 44, 0.16), transparent 65%), var(--ink-3);
  border-color: rgba(255, 107, 44, 0.5);
}

.page-about .reach-card--accent h3 {
  color: var(--orange);
  margin-top: 0;
  font-size: 18px;
}

.page-about .reach-card--accent p {
  color: var(--silver);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding-block: clamp(44px, 6vw, 78px);
  background:
    repeating-linear-gradient(115deg, rgba(27, 58, 102, 0.5) 0 1px, transparent 1px 60px),
    var(--deep);
}

.page-about .about-close__inner {
  display: grid;
  gap: 22px;
  border-top: 6px solid var(--cyan);
  padding-top: clamp(24px, 3vw, 36px);
}

.page-about .about-close h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.14;
  color: var(--paper);
  margin: 0;
  letter-spacing: -0.015em;
}

.page-about .about-close p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

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

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

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

  .page-about .lab-row {
    grid-template-columns: 190px minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
  }

  .page-about .lab-row__tag {
    margin-top: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.6fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-about .about-hero__title {
    transform: skewX(-4deg);
    transform-origin: left bottom;
    padding-bottom: 6px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    align-items: start;
  }

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

  .page-about .tl__item {
    grid-template-columns: 148px 44px minmax(0, 1fr);
    padding-bottom: 0;
  }

  .page-about .tl__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-top: 10px;
  }

  .page-about .tl__rail {
    display: block;
    position: relative;
    align-self: stretch;
  }

  .page-about .tl__rail::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    transform: translateX(-50%);
    background: var(--line);
  }

  .page-about .tl__item:first-child .tl__rail::before {
    top: 18px;
  }

  .page-about .tl__item:last-child .tl__rail::before {
    bottom: calc(100% - 20px);
  }

  .page-about .tl__diamond {
    position: absolute;
    left: 50%;
    top: 14px;
    width: 14px;
    height: 14px;
    transform: translate(-50%, 0) rotate(45deg);
    background: var(--deep);
    border: 2px solid var(--cyan);
    transition: background 0.18s ease, box-shadow 0.18s ease;
  }

  .page-about .tl__item:hover .tl__diamond,
  .page-about .tl__item:focus-within .tl__diamond {
    background: var(--cyan);
    box-shadow: 0 0 18px rgba(0, 229, 255, 0.75);
  }

  .page-about .tl__body {
    margin-top: 0;
    margin-bottom: 30px;
  }

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

  .page-about .tl__item:hover .tl__body {
    border-left-color: var(--cyan);
    transform: translateX(4px);
    box-shadow: var(--shadow-lift);
  }

  .page-about .about-team__cols {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.45fr);
    align-items: start;
  }

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

  .page-about .about-lab__grid {
    grid-template-columns: minmax(240px, 0.4fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.65fr);
    align-items: start;
  }

  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

  .page-about .about-close__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__title,
  .page-about .tl__body,
  .page-about .reach-card,
  .page-about .tl__diamond {
    transition: none;
  }

  .page-about .tl__item:hover .tl__body,
  .page-about .reach-card:hover {
    transform: none;
  }
}