.page-about {
  --about-line: rgba(34, 227, 210, .18);
  --about-glow: rgba(34, 227, 210, .28);
  --about-gap: clamp(48px, 7vw, 96px);
  padding-block: clamp(20px, 3vw, 36px) clamp(56px, 8vw, 104px);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  border-bottom: 1px solid var(--steel);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-size: clamp(32px, 6.2vw, 64px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--white);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  max-width: 64ch;
  font-size: clamp(16px, 1.15vw, 18px);
  line-height: 1.85;
  color: var(--gray);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  background: var(--steel);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .fig {
  background: var(--ink);
  padding: 18px 20px 20px;
}

.page-about .fig dt {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gray);
  margin-bottom: 10px;
}

.page-about .fig dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.page-about .fig .stat-value {
  font-family: var(--mono);
  font-size: clamp(28px, 4.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--cyan);
}

.page-about .fig .stat-value--lava {
  color: var(--lava);
}

.page-about .fig-unit {
  font-size: 13px;
  color: var(--gray);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  margin-top: var(--about-gap);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .team-copy > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  max-width: 56ch;
}

.page-about .ring-block {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  align-items: center;
  margin-top: clamp(24px, 3vw, 34px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--navy);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
}

.page-about .ring {
  width: min(240px, 68vw);
  height: auto;
  margin-inline: auto;
  display: block;
}

.page-about .ring circle {
  fill: none;
}

.page-about .ring-track {
  stroke: var(--steel);
}

.page-about .ring-seg {
  transition: stroke-width var(--t-base) var(--ease), opacity var(--t-base) var(--ease);
  stroke-linecap: butt;
}

.page-about .ring-seg--a { stroke: var(--cyan); }
.page-about .ring-seg--b { stroke: var(--lava); }
.page-about .ring-seg--c { stroke: var(--grass); }
.page-about .ring-seg--d { stroke: var(--sand); }

.page-about .ring:hover .ring-seg {
  opacity: .45;
}

.page-about .ring .ring-seg:hover {
  opacity: 1;
  stroke-width: 28;
}

.page-about .ring-total {
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  fill: var(--white);
}

.page-about .ring-cap {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  fill: var(--gray);
}

.page-about .ring-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .legend-row {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  font-size: 15px;
  color: var(--mist);
  transition: background var(--t-fast) var(--ease);
}

.page-about .legend-row:hover {
  background: rgba(28, 58, 87, .55);
}

.page-about .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
}

.page-about .legend-row--a .dot { background: var(--cyan); }
.page-about .legend-row--b .dot { background: var(--lava); }
.page-about .legend-row--c .dot { background: var(--grass); }
.page-about .legend-row--d .dot { background: var(--sand); }

.page-about .legend-num {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--navy);
}

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

.page-about .team-figure figcaption {
  padding: 14px 18px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
  border-top: 1px solid var(--steel);
}

.page-about .role-stack {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .role-card {
  padding: 22px 22px 24px;
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease);
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px var(--about-line);
}

.page-about .role-num {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--lava);
  letter-spacing: .01em;
}

.page-about .role-card h3 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -.01em;
}

.page-about .role-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 年份轨道 ---------- */
.page-about .track {
  position: relative;
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--navy);
}

.page-about .track-bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
}

.page-about .track-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .26;
}

.page-about .track-list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: clamp(26px, 4vw, 48px) clamp(18px, 3.5vw, 44px);
}

.page-about .track-node {
  position: relative;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 26px;
}

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

.page-about .track-node::before {
  content: "";
  position: absolute;
  left: 37px;
  top: 42px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--about-glow), rgba(34, 227, 210, 0));
}

.page-about .track-node:last-child::before {
  display: none;
}

.page-about .track-capsule {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 8px 4px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-align: center;
  color: var(--cyan);
  background: var(--ink);
  border: 1px solid var(--steel);
  border-radius: var(--radius-pill);
  transition: border-color var(--t-base) var(--ease), box-shadow var(--t-base) var(--ease), color var(--t-base) var(--ease);
  height: fit-content;
}

.page-about .track-node:hover .track-capsule,
.page-about .track-node:focus-within .track-capsule {
  border-color: var(--cyan);
  color: var(--white);
  box-shadow: 0 0 0 4px rgba(34, 227, 210, .12), 0 0 22px var(--about-glow);
}

.page-about .track-body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.3vw, 20px);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -.01em;
}

.page-about .track-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gray);
  max-width: 62ch;
}

/* ---------- 流程 ---------- */
.page-about .pipeline-lede {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--gray);
  margin: 0 0 clamp(22px, 3vw, 32px);
}

.page-about .pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: pipe;
}

.page-about .pipe-step {
  counter-increment: pipe;
  position: relative;
  padding: 22px 22px 24px 62px;
  background: var(--navy);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .pipe-step::before {
  content: counter(pipe, decimal-leading-zero);
  position: absolute;
  left: 22px;
  top: 22px;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--lava);
}

.page-about .pipe-step:hover,
.page-about .pipe-step:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .pipe-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .pipe-head h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -.01em;
}

.page-about .pipe-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gray);
  max-width: 64ch;
}

/* ---------- 协作网络 ---------- */
.page-about .partners-grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .partners-figure {
  margin: 0;
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--navy);
  padding: clamp(12px, 2vw, 22px);
}

.page-about .partners-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .partners-copy > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  margin: 0 0 16px;
  max-width: 58ch;
}

.page-about .partner-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .partner-stats li {
  background: var(--ink);
  padding: 16px 16px 18px;
}

.page-about .ps-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .ps-txt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .partners-note {
  margin: 22px 0 0 !important;
  font-size: 15px;
  line-height: 1.85;
  color: var(--gray);
}

.page-about .partners-note a,
.page-about .cta-links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .partners-note a:hover,
.page-about .cta-links a:hover,
.page-about .partners-note a:focus-visible,
.page-about .cta-links a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 荣誉 ---------- */
.page-about .honor-grid {
  display: grid;
  gap: 18px;
}

.page-about .honor-card {
  padding: 26px 24px 28px;
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .honor-card:hover,
.page-about .honor-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .honor-year {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sand);
}

.page-about .honor-card h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 1.5vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--white);
  letter-spacing: -.01em;
}

.page-about .honor-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: var(--about-gap);
}

.page-about .cta-inner {
  position: relative;
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(34, 227, 210, .14) 0%, rgba(7, 19, 34, 0) 55%),
    var(--navy);
  overflow: hidden;
}

.page-about .cta-inner h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--white);
  max-width: 20ch;
}

.page-about .cta-inner > p {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--gray);
  max-width: 58ch;
}

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

.page-about .cta-links {
  margin: 22px 0 0 !important;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ring-block {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  }

  .page-about .ring {
    margin-inline: 0;
  }

  .page-about .role-stack {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .role-card:nth-child(2n) {
    transform: translateY(26px);
  }

  .page-about .role-card:nth-child(2n):hover,
  .page-about .role-card:nth-child(2n):focus-within {
    transform: translateY(24px);
  }

  .page-about .track-node {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .track-node::before {
    left: 47px;
  }

  .page-about .partner-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .honor-card--offset {
    transform: translateY(32px);
  }

  .page-about .honor-card--offset:hover,
  .page-about .honor-card--offset:focus-within {
    transform: translateY(30px);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }

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

  .page-about .pipeline {
    gap: 14px;
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .pipe-step,
  .page-about .honor-card,
  .page-about .track-capsule,
  .page-about .ring-seg {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .role-card:focus-within,
  .page-about .pipe-step:hover,
  .page-about .pipe-step:focus-within,
  .page-about .honor-card:hover,
  .page-about .honor-card:focus-within {
    transform: none;
  }

  .page-about .role-card:nth-child(2n),
  .page-about .role-card:nth-child(2n):hover,
  .page-about .role-card:nth-child(2n):focus-within,
  .page-about .honor-card--offset,
  .page-about .honor-card--offset:hover,
  .page-about .honor-card--offset:focus-within {
    transform: translateY(0);
  }
}