.page-about {
  --about-gap: clamp(20px, 4vw, 48px);
  --about-line: rgba(169, 182, 208, .16);
  color: var(--moon);
  font-family: var(--font-body);
  background:
    radial-gradient(120% 70% at 88% -8%, rgba(36, 26, 74, .9), transparent 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 46%, var(--ink-900) 100%);
  padding-bottom: clamp(40px, 7vw, 88px);
  overflow-x: hidden;
}

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

.page-about .about-hero {
  padding: clamp(24px, 5vw, 56px) 0 clamp(32px, 6vw, 72px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  margin-top: clamp(20px, 4vw, 40px);
}

.page-about .hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: .015em;
  margin: .18em 0 .5em;
  max-width: 15em;
  background: linear-gradient(120deg, var(--moon) 48%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .hero-lede {
  font-size: clamp(1rem, 1.15vw, 1.125rem);
  line-height: 1.8;
  color: var(--haze);
  max-width: 36em;
  margin: 0 0 clamp(20px, 3vw, 30px);
}

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

.page-about .hero-figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: linear-gradient(165deg, rgba(36, 26, 74, .8), rgba(6, 9, 18, .9));
}

.page-about .hero-figure .media-frame {
  aspect-ratio: 4 / 3;
  border-radius: 0;
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .hero-figure .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 18px clamp(16px, 2.5vw, 24px) 20px;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--about-line);
  background: rgba(6, 9, 18, .55);
}

.page-about .hero-facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(169, 182, 208, .14);
}

.page-about .hero-facts li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .hero-facts .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
  min-width: 2.6em;
}

.page-about .fact-label {
  font-size: .9rem;
  color: var(--haze);
  letter-spacing: .02em;
}

.page-about .about-shell {
  display: grid;
  gap: clamp(22px, 3.5vw, 44px);
  padding-top: clamp(20px, 3vw, 40px);
}

.page-about .about-rail {
  border-top: 1px solid var(--about-line);
  padding-top: 18px;
}

.page-about .rail-kicker {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--gold);
  margin: 0 0 14px;
}

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

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--about-line);
  color: var(--haze);
  text-decoration: none;
  font-size: .85rem;
  line-height: 1;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--moon);
  border-color: var(--cyan);
  background: rgba(61, 242, 210, .08);
}

.page-about .rail-idx {
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--cyan);
}

.page-about .about-sec {
  padding: clamp(28px, 4.5vw, 56px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  line-height: 1.34;
  letter-spacing: .01em;
  margin: .35em 0 .7em;
  max-width: 22em;
}

.page-about .about-text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--haze);
  max-width: 40em;
  margin: 0 0 clamp(20px, 3vw, 30px);
}

.page-about .pulse-grid {
  display: grid;
  gap: 14px;
}

.page-about .pulse-card {
  position: relative;
  padding: 24px 22px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(26, 43, 85, .8), rgba(11, 23, 48, .9));
  overflow: hidden;
}

.page-about .pulse-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), transparent 80%);
}

.page-about .pulse-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .pulse-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 0 0 .55em;
  color: var(--moon);
}

.page-about .pulse-card p {
  font-size: .95rem;
  line-height: 1.72;
  color: var(--haze);
  margin: 0;
}

.page-about .map-grid {
  display: grid;
  gap: 14px;
}

.page-about .map-cell {
  padding: 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: rgba(26, 43, 85, .42);
}

.page-about .map-cell h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 .7em;
  color: var(--moon);
  padding-left: 12px;
  position: relative;
}

.page-about .map-cell h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: .42em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 242, 210, .14);
}

.page-about .map-cell p {
  font-size: .93rem;
  line-height: 1.75;
  color: var(--haze);
  margin: 0;
}

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

.page-about .chip-list li {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(61, 242, 210, .3);
  color: var(--cyan);
  background: rgba(18, 59, 58, .45);
}

.page-about .link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-figure,
.page-about .era-figure {
  margin: 0 0 clamp(20px, 3vw, 32px);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .team-figure .media-frame,
.page-about .era-figure .media-frame {
  border-radius: 0;
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .team-figure .media-frame img,
.page-about .era-figure .media-frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .gate-grid {
  display: grid;
  gap: 12px;
}

.page-about .gate-card {
  padding: 22px;
  border-radius: var(--r-sm);
  border: 1px solid var(--about-line);
  background: linear-gradient(180deg, rgba(26, 43, 85, .7), rgba(6, 9, 18, .7));
  display: grid;
  gap: 6px;
}

.page-about .gate-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .gate-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0;
  color: var(--moon);
}

.page-about .gate-card p {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--haze);
  margin: 0;
}

.page-about .era-track {
  position: relative;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .era-line {
  display: none;
}

.page-about .era-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .era-item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid rgba(61, 242, 210, .28);
}

.page-about .era-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .era-dot {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(61, 242, 210, .12);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .era-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--amber);
  margin-bottom: 4px;
}

.page-about .era-item h3 {
  font-size: .98rem;
  font-weight: 700;
  margin: 0 0 .35em;
  color: var(--moon);
}

.page-about .era-note {
  font-size: .9rem;
  line-height: 1.7;
  color: var(--haze);
  margin: 0;
  max-width: 26em;
  transition: color var(--dur) var(--ease);
}

.page-about .eco-list {
  display: grid;
  gap: 12px;
}

.page-about .eco-item {
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  background: rgba(26, 43, 85, .45);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.page-about .eco-item[open] {
  border-color: rgba(246, 185, 74, .45);
  background: rgba(18, 59, 58, .32);
}

.page-about .eco-item summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--moon);
}

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

.page-about .eco-item summary::after {
  content: "展开";
  margin-left: auto;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .eco-item[open] summary::after {
  content: "收起";
  color: var(--gold);
}

.page-about .eco-num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--gold);
  min-width: 1.6em;
}

.page-about .eco-name {
  font-size: .95rem;
}

.page-about .eco-body {
  margin: 0;
  padding: 0 20px 18px;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .about-cta {
  margin-top: clamp(20px, 4vw, 44px);
  border-radius: var(--r-xl);
  border: 1px solid rgba(61, 242, 210, .28);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(61, 242, 210, .16), transparent 62%),
    linear-gradient(150deg, rgba(36, 26, 74, .9), rgba(6, 9, 18, .95));
  padding: clamp(26px, 4vw, 44px);
}

.page-about .cta-inner {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .cta-copy h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.45rem, 2.8vw, 2.1rem);
  line-height: 1.36;
  margin: .3em 0 .6em;
  color: var(--moon);
}

.page-about .cta-copy p {
  font-size: .96rem;
  line-height: 1.8;
  color: var(--haze);
  margin: 0;
  max-width: 34em;
}

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

@media (min-width: 760px) {
  .page-about .pulse-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 860px) {
  .page-about .era-track {
    padding-top: 10px;
  }

  .page-about .era-line {
    display: block;
    width: 100%;
    height: auto;
    margin-bottom: -26px;
    overflow: visible;
  }

  .page-about .era-line path {
    fill: none;
    stroke: var(--cyan);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-dasharray: 5 11;
    opacity: .55;
  }

  .page-about .era-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .era-item {
    border-left: 0;
    padding: 0;
    transition: transform var(--dur) var(--ease);
  }

  .page-about .era-dot {
    position: static;
    display: block;
    margin-bottom: 12px;
  }

  .page-about .era-item:hover {
    transform: translateY(-4px);
  }

  .page-about .era-item:hover .era-dot {
    box-shadow: 0 0 0 8px rgba(61, 242, 210, .18);
  }

  .page-about .era-item:hover .era-note {
    color: var(--moon);
  }
}

@media (min-width: 1024px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: end;
  }

  .page-about .about-shell {
    grid-template-columns: 172px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(24px, 4vw, 56px);
    border-top: 0;
    border-left: 1px solid var(--about-line);
    padding-top: 0;
    padding-left: 18px;
  }

  .page-about .rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 4px;
  }

  .page-about .rail-list a {
    border-color: transparent;
    border-radius: var(--r-sm);
    padding: 10px 12px;
    width: 100%;
  }

  .page-about .about-sec--narrow {
    max-width: 74%;
  }

  .page-about .about-sec--narrow .about-text {
    max-width: 38em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pulse-card,
  .page-about .era-item,
  .page-about .era-dot,
  .page-about .rail-list a {
    transition: none;
  }

  .page-about .era-item:hover {
    transform: none;
  }
}
<<<END>>>