.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-rail: 3fr;
  display: block;
}

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

.page-about .breadcrumbs {
  padding-block: 16px 10px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

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

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: clamp(12px, 2vw, 22px) clamp(34px, 6vw, 72px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .hero-rail {
  border-left: var(--bw) solid var(--line);
  padding-left: 16px;
}

.page-about .season-axis {
  list-style: none;
  margin: 16px 0 0;
  padding: 0 0 0 20px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .season-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: var(--bw);
  background: linear-gradient(180deg, var(--ice) 0%, var(--fl-yellow) 42%, var(--fl-red) 72%, var(--haze) 100%);
}

.page-about .season-axis li {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.page-about .season-axis li::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 0.62em;
  width: 11px;
  height: 11px;
  background: var(--night);
  border: var(--bw) solid var(--ice);
  transform: translateY(-50%) rotate(45deg);
}

.page-about .season-axis li:nth-child(2)::before { border-color: var(--fl-yellow); }
.page-about .season-axis li:nth-child(3)::before { border-color: var(--fl-red); }
.page-about .season-axis li:nth-child(4)::before { border-color: var(--fl-green); }
.page-about .season-axis li:nth-child(5)::before { border-color: var(--fl-blue); }
.page-about .season-axis li:nth-child(6)::before { border-color: var(--fl-white); }

.page-about .axis-num {
  font-size: 1rem;
  color: var(--snow);
  letter-spacing: 0.04em;
}

.page-about .hero-copy .eyebrow {
  margin-bottom: 10px;
}

.page-about .hero-copy h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.75rem, 5.4vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--snow);
}

.page-about .hero-copy .lede {
  max-width: 44ch;
  color: var(--text);
  line-height: 1.85;
  margin: 0 0 28px;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  border-top: var(--bw) solid var(--line);
  padding-top: 20px;
}

.page-about .hero-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hero-stats .stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1;
  color: var(--fl-yellow);
}

.page-about .hero-stats .stat:nth-child(2) .stat-value { color: var(--ice); }
.page-about .hero-stats .stat:nth-child(3) .stat-value { color: var(--fl-green); }
.page-about .hero-stats .stat:nth-child(4) .stat-value { color: var(--snow); }

.page-about .hero-stats .stat-label {
  font-size: 0.84rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.page-about .hero-figure {
  margin: clamp(28px, 5vw, 52px) 0 0;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding-block: clamp(40px, 7vw, 84px);
}

.page-about .section-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .section-aside {
  border-left: var(--bw) solid var(--line);
  padding-left: 16px;
}

.page-about .section-mark {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--line-strong);
  margin-top: 10px;
}

.page-about .section-body .section-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--snow);
}

.page-about .section-body .lede {
  max-width: 46ch;
  color: var(--text);
  line-height: 1.85;
  margin: 0 0 26px;
}

.page-about .section-body .prose p {
  margin: 0 0 18px;
  max-width: 42ch;
  line-height: 1.9;
  color: var(--text);
}

.page-about .section-body .prose p:last-child {
  margin-bottom: 0;
}

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

/* ---------- 团队分工 ---------- */

.page-about .role-cards {
  display: grid;
  gap: var(--about-gap);
}

.page-about .role-card {
  padding: 20px 20px 22px;
}

.page-about .role-card h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.4;
  margin: 14px 0 10px;
  color: var(--snow);
}

.page-about .role-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 旅程 ---------- */

.page-about .journey-figure {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .journey-svg {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .journey-svg .svg-step {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  fill: var(--snow);
}

.page-about .journey-svg .svg-time {
  font-family: var(--font-mono);
  font-size: 22px;
  fill: var(--text-dim);
}

.page-about .journey-svg circle {
  fill: var(--night);
  stroke-width: 4;
}

.page-about .journey-svg .jid-1 circle { stroke: var(--fl-blue); }
.page-about .journey-svg .jid-2 circle { stroke: var(--fl-white); }
.page-about .journey-svg .jid-3 circle { stroke: var(--fl-red); }
.page-about .journey-svg .jid-4 circle { stroke: var(--fl-yellow); }
.page-about .journey-svg .jid-5 circle { stroke: var(--fl-green); }

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

.page-about .journey-node {
  border: var(--bw) solid var(--line);
  background: var(--night);
  box-shadow: var(--shadow-sm);
}

.page-about .journey-node summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  align-items: center;
  padding: 16px 18px;
}

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

.page-about .journey-node summary::after {
  content: "展开";
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.page-about .journey-node[open] summary::after {
  content: "收起";
  color: var(--fl-yellow);
}

.page-about .node-index {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--fl-yellow);
  line-height: 1;
}

.page-about .node-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--snow);
}

.page-about .node-time {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.page-about .journey-node[open] {
  border-color: var(--line-strong);
  background: var(--indigo);
}

.page-about .node-body {
  padding: 0 18px 18px 18px;
  border-top: var(--bw-thin) solid var(--line-soft);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .node-body p {
  margin: 0;
  max-width: 44ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 版本线 ---------- */

.page-about .axis-texture {
  margin: 20px 0 0;
  max-width: 160px;
}

.page-about .version-pair {
  display: grid;
  gap: var(--about-gap);
}

.page-about .version-card {
  padding: 22px 20px 24px;
}

.page-about .version-card--new {
  border-color: var(--fl-yellow);
  box-shadow: var(--shadow);
}

.page-about .version-card h3 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.4;
  margin: 14px 0 14px;
  color: var(--snow);
}

.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .version-list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--ice);
}

.page-about .version-card--new .version-list li::before {
  background: var(--fl-yellow);
}

.page-about .version-note {
  margin-top: 26px;
  max-width: 46ch;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 打开与维护 ---------- */

.page-about .access-note {
  margin-top: 26px;
  max-width: 46ch;
  line-height: 1.9;
  color: var(--text);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  padding-block: clamp(40px, 7vw, 84px) clamp(56px, 9vw, 110px);
}

.page-about .cta-panel {
  padding: clamp(24px, 4vw, 40px);
  background:
    linear-gradient(135deg, rgba(88, 213, 230, 0.14) 0%, rgba(233, 179, 60, 0.1) 100%),
    var(--indigo);
}

.page-about .cta-panel h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 2.1rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 12px 0 14px;
  color: var(--snow);
}

.page-about .cta-panel p {
  max-width: 48ch;
  margin: 0 0 24px;
  line-height: 1.85;
  color: var(--text);
}

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

/* ---------- 平板与桌面 ---------- */

@media (min-width: 640px) {
  .page-about .journey-node summary {
    grid-template-columns: auto 1fr auto;
  }

  .page-about .node-time {
    grid-column: auto;
    text-align: right;
  }

  .page-about .journey-node summary::after {
    grid-column: 1 / -1;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(150px, 2fr) 8fr;
    align-items: start;
  }

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

  .page-about .section-grid {
    grid-template-columns: minmax(130px, 2fr) 9fr;
    align-items: start;
  }

  .page-about .section-aside {
    position: sticky;
    top: 128px;
  }

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

  .page-about .role-card:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .role-card:nth-child(3) {
    margin-top: -10px;
  }

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

@media (min-width: 1080px) {
  .page-about .journey-node summary {
    padding: 18px 24px;
  }

  .page-about .node-body {
    padding: 16px 24px 20px 24px;
  }

  .page-about .role-cards {
    gap: calc(var(--about-gap) + 8px);
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>