.page-about {
  --about-tint: #E6EDE1;
  --about-ink: #10241F;
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.015em;
}

.page-about p {
  margin: 0;
}

.page-about ul,
.page-about ol,
.page-about dl {
  margin: 0;
  padding: 0;
}

.page-about li {
  list-style: none;
}

.page-about figure {
  margin: 0;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 5vw, 3.25rem) 0 clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(110% 80% at 88% -20%, rgba(216, 255, 62, 0.16), transparent 62%),
    radial-gradient(90% 80% at 0% 0%, rgba(18, 59, 74, 0.9), transparent 70%),
    linear-gradient(180deg, var(--night) 0%, var(--ink) 90%);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb a {
  color: var(--mint);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--lime);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero-lead .kicker {
  display: block;
  margin-top: 1.1rem;
}

.page-about h1 {
  margin-top: 0.75rem;
  font-size: clamp(2.05rem, 8vw, 3.9rem);
  font-weight: 900;
  color: var(--mist);
}

.page-about .about-hero-copy {
  margin-top: 1.1rem;
  max-width: 52ch;
  font-size: clamp(0.98rem, 1.4vw, 1.075rem);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero-note {
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--line);
  border-top: 3px solid var(--lime);
  border-radius: var(--radius);
}

.page-about .about-hero-note > p:not(.kicker) {
  margin-top: 0.6rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-facts {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.7rem;
}

.page-about .about-facts > div {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
}

.page-about .about-facts dt {
  min-width: 3.2rem;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-hero-media {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
}

/* ---------- 起点 ---------- */

.page-about .about-origin {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--deep) 100%);
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-origin-body h2 {
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
}

.page-about .about-origin-body p {
  margin-top: 1rem;
  max-width: 60ch;
  font-size: 0.97rem;
  line-height: 1.9;
  color: var(--stone);
}

.page-about .about-origin-note {
  border-left: 2px solid var(--lime);
  padding: 0.2rem 0 0.2rem 1rem;
}

.page-about .about-origin-list {
  margin-top: 0.9rem;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-origin-list li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-origin-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--ember);
}

/* ---------- 时间轴 ---------- */

.page-about .about-stages {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(90, 77, 255, 0.16), transparent 65%),
    linear-gradient(180deg, var(--deep) 0%, var(--night) 60%, var(--ink) 100%);
}

.page-about .about-stages-head h2 {
  margin-top: 0.6rem;
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
}

.page-about .about-stages-head p:last-child {
  margin-top: 1rem;
  max-width: 56ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .stage-track {
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  display: grid;
  gap: 0;
}

.page-about .stage-item {
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr);
  gap: clamp(0.85rem, 2vw, 1.5rem);
  padding-bottom: clamp(0.75rem, 2vw, 1.25rem);
}

.page-about .stage-rail {
  position: relative;
  min-height: 100%;
}

.page-about .stage-line {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: var(--mint);
  stroke-width: 1.5;
  stroke-opacity: 0.5;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.page-about .stage-line polyline {
  fill: none;
}

.page-about .stage-dot {
  position: absolute;
  left: 50%;
  top: 0.6rem;
  width: 10px;
  height: 10px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(216, 255, 62, 0.14);
}

.page-about .stage-body {
  padding: 0.3rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
}

.page-about .stage-item:last-child .stage-body {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .stage-index {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .stage-body h3 {
  margin-top: 0.4rem;
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
}

.page-about .stage-copy {
  margin-top: 0.65rem;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .stage-more {
  margin-top: 0.35rem;
}

.page-about .stage-more summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--mint);
  transition: color 120ms var(--ease);
}

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

.page-about .stage-more summary::before {
  content: "+";
  display: inline-grid;
  place-items: center;
  width: 1.15rem;
  height: 1.15rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 0.85rem;
  line-height: 1;
}

.page-about .stage-more[open] summary::before {
  content: "−";
}

.page-about .stage-more summary:hover {
  color: var(--lime);
}

.page-about .stage-more summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .stage-more-body {
  padding: 0.1rem 0 0.75rem;
  max-width: 60ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  background: var(--deep);
}

.page-about .about-team-panel {
  padding: clamp(1.25rem, 4vw, 2.75rem);
  border-radius: var(--radius);
}

.page-about .about-team-head h2 {
  margin-top: 0.6rem;
  color: var(--about-ink);
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
}

.page-about .about-team-copy {
  margin-top: 0.95rem;
  max-width: 62ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--panel);
}

.page-about .about-stats {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.page-about .about-stats li {
  padding: 0.9rem 0.85rem 1rem;
  background: var(--about-tint);
  border-top: 3px solid var(--teal);
  border-radius: 0 0 var(--radius) var(--radius);
}

.page-about .stat-num {
  display: block;
  font-size: clamp(1.9rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--panel);
}

.page-about .about-team-split {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .team-roles {
  display: grid;
  gap: 0.15rem;
}

.page-about .team-role {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.25rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(16, 36, 31, 0.16);
}

.page-about .team-role:first-child {
  padding-top: 0;
}

.page-about .team-role .mono {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.page-about .team-role span:last-child {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--panel);
}

/* ---------- 合作网络 ---------- */

.page-about .about-network {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  background: linear-gradient(160deg, var(--teal) 0%, var(--night) 46%, var(--ink) 100%);
}

.page-about .about-network-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-network-copy h2 {
  margin-top: 0.6rem;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
}

.page-about .about-network-copy p {
  margin-top: 0.95rem;
  max-width: 56ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-tags {
  margin-top: 1.3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .about-tags .tag {
  font-size: 0.78rem;
  border-color: var(--line-strong);
  color: var(--mist);
  background: rgba(124, 255, 203, 0.1);
}

.page-about .about-network-fig {
  align-self: start;
}

/* ---------- 承诺与联系 ---------- */

.page-about .about-commit {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(3rem, 7vw, 5rem);
  background: var(--ink-900);
}

.page-about .about-commit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-commit-main h2 {
  margin-top: 0.6rem;
  font-size: clamp(1.7rem, 3.6vw, 2.3rem);
}

.page-about .about-commit-copy {
  margin-top: 1rem;
  max-width: 58ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .commit-steps {
  margin-top: 1.35rem;
  display: grid;
  gap: 0.9rem;
}

.page-about .commit-steps li {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 0.85rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.page-about .commit-steps .mono {
  padding-top: 0.15rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .commit-steps strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .commit-steps p {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-contact {
  padding: clamp(1.15rem, 3vw, 1.75rem);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ember);
  border-radius: var(--radius);
}

.page-about .about-contact-title {
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  color: var(--mist);
}

.page-about .about-contact-list {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-contact-row {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-contact-key {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-contact-val {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
  overflow-wrap: anywhere;
}

.page-about .about-note {
  margin-top: 1rem;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-icp {
  margin-top: 0.7rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .about-contact-actions {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .team-role {
    grid-template-columns: 5.4rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0.85rem;
  }
}

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

@media (min-width: 780px) {
  .page-about .stage-item {
    grid-template-columns: 3rem minmax(0, 1fr);
    gap: 1.75rem;
  }
}

@media (min-width: 880px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about h1 {
    transform: skewX(-2deg);
    transform-origin: left bottom;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: center;
  }

  .page-about .about-commit-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-team-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about h1 {
    transform: none;
  }

  .page-about .stage-more summary {
    transition: none;
  }
}
<<<END>>>