.page-about {
  --about-rail-x: 14px;
  --about-node-top: clamp(38px, 6vw, 56px);
  display: block;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(104px, 13vw, 148px) var(--gutter) clamp(72px, 9vw, 120px);
  color: var(--white);
  overflow-x: hidden;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-crumb .breadcrumb {
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  margin-bottom: clamp(48px, 7vw, 84px);
}

.page-about .hero-frame {
  position: relative;
  padding: clamp(26px, 4vw, 52px) clamp(22px, 3.6vw, 48px) clamp(28px, 4vw, 48px);
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 96% at 88% -6%, rgba(47, 230, 198, 0.14), transparent 58%),
    linear-gradient(180deg, var(--deep-green) 0%, rgba(10, 19, 17, 0.55) 100%);
}

.page-about .hero-frame::before,
.page-about .hero-frame::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border-style: solid;
  border-width: 0;
  border-color: var(--signal);
  opacity: 0.7;
  pointer-events: none;
}

.page-about .hero-frame::before {
  top: -1px;
  left: -1px;
  border-top-width: 2px;
  border-left-width: 2px;
  border-top-left-radius: var(--radius-lg);
}

.page-about .hero-frame::after {
  right: -1px;
  bottom: -1px;
  border-right-width: 2px;
  border-bottom-width: 2px;
  border-bottom-right-radius: var(--radius-lg);
}

.page-about .hero-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 7px 15px 7px 12px;
  border: 1px solid rgba(47, 230, 198, 0.3);
  border-radius: 999px;
  background: rgba(47, 230, 198, 0.08);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .about-hero h1 {
  margin: 22px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 5.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 46em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  letter-spacing: -0.01em;
  color: var(--mist);
}

/* ---------- 首屏年份跳转 ---------- */
.page-about .hero-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .hero-jump a {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--white);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .hero-jump a:hover,
.page-about .hero-jump a:focus-visible {
  border-color: var(--signal);
  color: var(--signal);
  background: rgba(47, 230, 198, 0.08);
}

/* ---------- 首屏数据格 ---------- */
.page-about .hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 42px) 0 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--edge);
}

.page-about .figure-cell {
  display: flex;
  flex-direction: column-reverse;
  gap: 9px;
  padding: 18px 18px 20px;
  background: rgba(10, 19, 17, 0.68);
}

.page-about .figure-cell dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .figure-cell dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(25px, 3.2vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

/* ---------- 纵向轨道 ---------- */
.page-about .history-rail {
  position: relative;
  margin-top: clamp(20px, 3vw, 40px);
}

.page-about .history-rail::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 48px;
  left: var(--about-rail-x);
  width: 1px;
  background: linear-gradient(180deg, var(--signal) 0%, var(--edge) 18%, var(--edge) 100%);
  opacity: 0.85;
  pointer-events: none;
}

.page-about .rail-node {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-left: calc(var(--about-rail-x) + 26px);
  padding-block: var(--about-node-top);
  scroll-margin-top: 120px;
}

.page-about .rail-node::before {
  content: "";
  position: absolute;
  left: var(--about-rail-x);
  top: calc(var(--about-node-top) + 10px);
  width: 9px;
  height: 9px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(47, 230, 198, 0.14);
  animation: about-signal 2.4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes about-signal {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 1;
  }
}

.page-about .node-side {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .node-year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .node-label {
  padding: 3px 10px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .node-main h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.3vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  max-width: 22em;
}

.page-about .node-main p {
  margin: 0 0 12px;
  max-width: 50em;
  font-size: 16px;
  line-height: 1.78;
  letter-spacing: -0.01em;
  color: var(--mist);
}

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

.page-about .node-main a {
  color: var(--signal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(47, 230, 198, 0.42);
  transition: color 0.18s var(--ease), text-decoration-color 0.18s var(--ease);
}

.page-about .node-main a:hover,
.page-about .node-main a:focus-visible {
  color: var(--score);
  text-decoration-color: currentColor;
}

.page-about .node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .node-tags .tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 节点配图 ---------- */
.page-about .node-media {
  position: relative;
  margin: 26px 0 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--charcoal);
}

.page-about .node-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) brightness(0.8);
}

.page-about .node-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(47, 230, 198, 0.1) 0%, rgba(10, 19, 17, 0.46) 100%);
  pointer-events: none;
}

/* ---------- 团队数据 ---------- */
.page-about .team-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--edge);
}

.page-about .team-figures > div {
  padding: 16px 18px 18px;
  background: var(--deep-green);
}

.page-about .team-figures dt {
  margin-bottom: 9px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .team-figures dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--score);
}

.page-about .team-figures dd small {
  margin-left: 7px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--mist);
}

/* ---------- 沿用至今 ---------- */
.page-about .steady-list {
  display: grid;
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--edge);
}

.page-about .steady-list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 20px 22px;
  background: var(--charcoal);
}

.page-about .steady-key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--signal);
}

.page-about .steady-list h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.page-about .steady-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 收束区 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: clamp(64px, 9vw, 116px);
  padding: clamp(32px, 5vw, 58px) clamp(24px, 4vw, 52px);
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    radial-gradient(92% 130% at 102% -10%, rgba(255, 138, 61, 0.18), transparent 60%),
    linear-gradient(140deg, var(--deep-green) 0%, var(--charcoal) 100%);
}

.page-about .cta-eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--score);
}

.page-about .about-cta h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  max-width: 20em;
}

.page-about .cta-text {
  margin: 16px 0 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .cta-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid var(--signal);
  border-radius: 999px;
  background: var(--signal);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .cta-pill:hover,
.page-about .cta-pill:focus-visible {
  background: var(--signal-deep);
  border-color: var(--signal-deep);
  transform: translateY(-1px);
}

.page-about .cta-pill--ghost {
  background: rgba(47, 230, 198, 0.06);
  color: var(--white);
  border-color: var(--edge);
}

.page-about .cta-pill--ghost:hover,
.page-about .cta-pill--ghost:focus-visible {
  background: rgba(47, 230, 198, 0.12);
  border-color: var(--signal);
  color: var(--signal);
}

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

@media (min-width: 880px) {
  .page-about {
    --about-rail-x: 60px;
    --about-node-top: clamp(66px, 7.5vw, 104px);
  }

  .page-about .history-rail::before {
    left: var(--about-rail-x);
  }

  .page-about .rail-node {
    grid-template-columns: 120px minmax(0, 1fr);
    column-gap: clamp(36px, 5vw, 72px);
    padding-left: 0;
  }

  .page-about .rail-node::before {
    left: var(--about-rail-x);
    top: calc(var(--about-node-top) + 12px);
  }

  .page-about .node-side {
    flex-direction: column;
    align-items: flex-start;
    gap: 9px;
    margin-bottom: 0;
  }

  .page-about .node-main {
    padding-top: 4px;
  }

  .page-about .node-media {
    grid-column: 2;
    margin-top: 30px;
  }

  .page-about .steady-list li {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 26px 26px;
  }
}

@media (min-width: 1120px) {
  .page-about .rail-node {
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: clamp(48px, 6vw, 92px);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .rail-node::before {
    animation: none;
    opacity: 1;
  }

  .page-about .cta-pill,
  .page-about .hero-jump a,
  .page-about .node-main a {
    transition: none;
  }

  .page-about .cta-pill:hover,
  .page-about .cta-pill:focus-visible {
    transform: none;
  }
}