.page-about {
  --about-axis: 2px;
  --about-head-gap: clamp(28px, 4vw, 48px);
  background: var(--rock-white);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .shell {
  position: relative;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(52px, 8vw, 116px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 78%;
  background:
    radial-gradient(120% 92% at 88% 0%, rgba(14, 91, 82, .14), transparent 62%),
    radial-gradient(90% 78% at 0% 22%, rgba(201, 162, 39, .13), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero .shell {
  z-index: 1;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 68px);
  align-items: start;
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .about-hero-copy h1 {
  font-size: clamp(32px, 6.4vw, 62px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 14px 0 0;
  max-width: 16em;
}

.page-about .about-hero-copy .lead {
  margin-top: clamp(16px, 2vw, 24px);
  max-width: 40em;
  color: var(--ink-80);
}

.page-about .about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .about-hero-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-12);
  border: 1px solid var(--ink-12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}

.page-about .hero-figure {
  background: var(--rock-white);
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 8px;
}

.page-about .hero-figure-num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.4vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--turquoise-deep);
}

.page-about .hero-figure-unit {
  font-size: 14px;
  color: var(--slate);
  letter-spacing: 0.08em;
}

.page-about .hero-figure-label {
  flex-basis: 100%;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 通用小标题 ---------- */
.page-about .about-section-head {
  margin-bottom: var(--about-head-gap);
}

.page-about .about-section-head h2 {
  margin: 12px 0 0;
  max-width: 20em;
}

.page-about .about-section-head .measure {
  margin-top: 16px;
  color: var(--slate);
}

/* ---------- 开篇 ---------- */
.page-about .about-origin {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
}

.page-about .origin-copy h2 {
  margin: 12px 0 20px;
}

.page-about .origin-copy p {
  max-width: 38em;
  color: var(--ink-80);
}

.page-about .origin-copy p + p {
  margin-top: 16px;
}

.page-about .origin-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--ink-12);
  box-shadow: var(--shadow-lift);
}

/* ---------- 年份轴 ---------- */
.page-about .about-timeline {
  padding-top: clamp(56px, 8vw, 104px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: clamp(30px, 4vw, 48px);
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: var(--about-axis);
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, .18) 100%);
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--rock-white);
  border: 2px solid var(--gold);
  box-sizing: border-box;
}

.page-about .tl-year {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--turquoise-deep);
  background: rgba(14, 91, 82, .09);
  border-radius: var(--radius-pill);
  padding: 3px 12px;
}

.page-about .tl-title {
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .tl-body p {
  max-width: 46em;
  color: var(--ink-80);
}

/* ---------- 两座基地 ---------- */
.page-about .about-bases {
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .bases-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 40px);
}

.page-about .base-seam {
  display: none;
}

.page-about .base {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--rock-white);
  border: 1px solid var(--ink-12);
  border-radius: var(--radius-lg);
}

.page-about .base--inject {
  border-top: 4px solid var(--turquoise-deep);
}

.page-about .base--assembly {
  border-top: 4px solid var(--tibetan-red);
}

.page-about .base-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--limestone);
}

.page-about .base-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--slate);
  margin: 0;
}

.page-about .base-title {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .base p {
  color: var(--ink-80);
}

.page-about .base-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .base-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-80);
}

.page-about .base-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 2px;
  background: var(--gold);
}

.page-about .base-list-num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--turquoise-deep);
  letter-spacing: 0.04em;
}

.page-about .base--assembly .base-list-num {
  color: var(--tibetan-red);
}

/* ---------- 质量体系 ---------- */
.page-about .about-quality {
  background: var(--ink);
  color: var(--rock-white);
  padding-top: clamp(56px, 8vw, 108px);
  padding-bottom: clamp(56px, 8vw, 108px);
}

.page-about .about-quality .about-section-head h2 {
  color: var(--rock-white);
}

.page-about .about-quality .about-section-head .measure {
  color: var(--light-55);
}

.page-about .about-quality .eyebrow {
  color: var(--gold);
}

.page-about .node-track {
  list-style: none;
  margin: 0 0 clamp(32px, 5vw, 56px);
  padding: 0 0 14px;
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .node {
  position: relative;
  flex: 1 0 128px;
  min-width: 128px;
  padding: 30px 14px 0 0;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .node::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(245, 241, 232, .18);
}

.page-about .node--inject::before {
  background: rgba(20, 163, 143, .55);
}

.page-about .node--assembly::before {
  background: rgba(165, 36, 30, .75);
}

.page-about .node-dot {
  position: absolute;
  top: 3px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  box-sizing: border-box;
}

.page-about .node--inject .node-dot {
  background: var(--turquoise-bright);
}

.page-about .node--assembly .node-dot {
  background: #D9503F;
}

.page-about .node-index {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .node-name {
  font-size: 14px;
  line-height: 1.6;
  color: var(--light-80);
}

.page-about .cert-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .cert {
  border: 1px solid rgba(245, 241, 232, .2);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  background: rgba(245, 241, 232, .05);
}

.page-about .cert summary {
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.02em;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

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

.page-about .cert summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--light-55);
}

.page-about .cert[open] summary::after {
  content: "−";
}

.page-about .cert p {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--light-80);
}

.page-about .cert summary:focus-visible {
  outline: 2px solid var(--turquoise-bright);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-top: clamp(52px, 7vw, 100px);
  padding-bottom: clamp(52px, 7vw, 100px);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .team-copy h2 {
  margin: 12px 0 20px;
}

.page-about .team-copy p {
  max-width: 40em;
  color: var(--ink-80);
}

.page-about .team-copy p + p {
  margin-top: 16px;
}

.page-about .team-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-12);
  border: 1px solid var(--ink-12);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .team-stats .stat {
  background: var(--limestone);
  padding: clamp(18px, 2.4vw, 26px);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .team-stats .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--turquoise-deep);
}

.page-about .team-stats .stat-label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

/* ---------- 数字一览 ---------- */
.page-about .about-numbers {
  padding-top: clamp(52px, 7vw, 100px);
  padding-bottom: clamp(52px, 7vw, 100px);
}

.page-about .numbers-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--ink-12);
  border-left: 1px solid var(--ink-12);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .number-cell {
  padding: clamp(18px, 2.2vw, 26px) clamp(14px, 1.8vw, 20px);
  border-right: 1px solid var(--ink-12);
  border-bottom: 1px solid var(--ink-12);
  background: var(--rock-white);
  display: grid;
  gap: 4px;
  align-content: start;
}

.page-about .number-value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .number-unit {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
  font-weight: 600;
}

.page-about .number-label {
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-outro {
  margin-top: clamp(32px, 4vw, 52px);
  padding-left: 20px;
  border-left: 2px solid var(--gold);
  display: grid;
  gap: 20px;
}

.page-about .about-outro p {
  max-width: 44em;
  color: var(--ink-80);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero-aside {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .tl-item {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: clamp(18px, 3vw, 40px);
    align-items: start;
  }

  .page-about .tl-year {
    background: none;
    padding: 0;
    font-size: 17px;
    line-height: 1.3;
    letter-spacing: 0.08em;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.95fr);
    gap: clamp(40px, 5vw, 84px);
    align-items: center;
  }

  .page-about .about-hero-aside {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  }

  .page-about .bases-grid {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
  }

  .page-about .base-seam {
    display: block;
    position: relative;
    width: 1px;
    align-self: stretch;
    background-image: linear-gradient(180deg, transparent, var(--ink-12) 14%, var(--ink-12) 86%, transparent);
  }

  .page-about .base-seam::after {
    content: "";
    position: absolute;
    left: -3px;
    top: 50%;
    width: 7px;
    height: 7px;
    transform: translateY(-50%) rotate(45deg);
    background: var(--gold);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(40px, 5vw, 72px);
  }

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

@media (min-width: 1140px) {
  .page-about .numbers-band {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .page-about .node {
    flex: 1 0 110px;
    min-width: 110px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}