.page-about {
  --about-line: rgba(91, 107, 102, .34);
  --about-line-soft: rgba(91, 107, 102, .16);
  --about-card: rgba(17, 20, 24, .82);
  position: relative;
  color: var(--text);
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, var(--about-line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  padding-bottom: clamp(3rem, 8vw, 6rem);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 4vw, 2rem) 0 clamp(2.5rem, 7vw, 4.5rem);
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: min(760px, 88%);
  aspect-ratio: 1;
  background: linear-gradient(135deg, rgba(94, 242, 232, .18), rgba(255, 138, 61, .14) 52%, rgba(232, 184, 75, .1) 72%, transparent 84%);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  padding: 0;
  list-style: none;
  font-size: .78rem;
  color: var(--text-dim);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: .4rem;
  color: var(--grid);
}

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

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  text-decoration: underline;
}

.page-about .about-hero h1 {
  max-width: 18ch;
  margin: 0 0 clamp(1rem, 2.5vw, 1.5rem);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 46ch;
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.1rem;
  background: var(--panel);
}

.page-about .stat-num {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -.02em;
}

.page-about .stat-label {
  font-size: .78rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-body {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .index-title {
  margin: 0 0 .75rem;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .about-index ol {
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .5rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  white-space: nowrap;
  padding: .45rem .9rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  font-size: .8rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-index a .mono {
  font-size: .7rem;
  color: var(--grid);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(94, 242, 232, .08);
}

.page-about .about-sections {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  padding-top: clamp(1.75rem, 4vw, 2.75rem);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: clamp(.85rem, 2.5vw, 1.5rem);
  margin-bottom: clamp(1rem, 2.5vw, 1.6rem);
}

.page-about .about-head .section-index {
  font-size: clamp(2.6rem, 9vw, 5.2rem);
  line-height: .82;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(94, 242, 232, .55);
  letter-spacing: -.04em;
}

.page-about .about-head-text .eyebrow {
  margin: 0 0 .4rem;
  font-size: .74rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--summer);
}

.page-about .about-head-text .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.4vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-prose {
  max-width: 44ch;
  font-size: clamp(.94rem, 1.5vw, 1.02rem);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-prose p {
  margin: 0 0 .9rem;
}

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

.page-about .coord-grid,
.page-about .seasons-grid,
.page-about .support-grid {
  display: grid;
  gap: clamp(1.25rem, 3.5vw, 2rem);
}

.page-about .about-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--about-card);
}

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

.page-about .about-figure .media-caption {
  padding: .6rem .85rem;
  font-size: .74rem;
  color: var(--text-dim);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .season-legend {
  display: grid;
  gap: .6rem;
  margin: 1.25rem 0;
  padding: 0;
  list-style: none;
}

.page-about .season-item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: .85rem;
  padding: .85rem .95rem;
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius);
  background: var(--about-card);
  transition: border-color .18s ease, transform .18s ease, background-color .18s ease;
}

.page-about .season-item:hover,
.page-about .season-item:focus-visible {
  border-color: var(--season-color, var(--cyan));
  background: rgba(17, 20, 24, .95);
  transform: translateX(3px);
  outline: none;
}

.page-about .season-item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .season-item--spring { --season-color: var(--spring); }
.page-about .season-item--summer { --season-color: var(--summer); }
.page-about .season-item--autumn { --season-color: var(--autumn); }
.page-about .season-item--winter { --season-color: var(--winter); }

.page-about .season-swatch {
  align-self: stretch;
  border-radius: var(--radius-pill);
  background: var(--season-color, var(--grid));
  min-height: 44px;
}

.page-about .season-name {
  display: block;
  margin-bottom: .3rem;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--season-color, var(--text));
}

.page-about .season-copy p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .season-note-card {
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--about-line);
  background: var(--panel);
  color: var(--text-dim);
  font-size: .88rem;
  line-height: 1.8;
}

.page-about .season-note-card p {
  margin: 0 0 .7rem;
}

.page-about .season-note-card p:last-child {
  margin-bottom: 0;
}

.page-about .season-code-line {
  color: var(--gold);
  font-size: .82rem;
}

.page-about .workflow-lede {
  margin-bottom: clamp(1.1rem, 3vw, 1.6rem);
}

.page-about .flow-steps {
  display: grid;
  gap: .75rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2rem);
  padding: 0;
  list-style: none;
}

.page-about .flow-step {
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--about-line-soft);
  border-left: 3px solid var(--winter);
  background: var(--about-card);
}

.page-about .flow-step:nth-child(2) {
  border-left-color: var(--autumn);
}

.page-about .flow-step:nth-child(3) {
  border-left-color: var(--spring);
}

.page-about .flow-num {
  display: block;
  margin-bottom: .3rem;
  font-size: .76rem;
  color: var(--text-dim);
  letter-spacing: .1em;
}

.page-about .flow-step h3 {
  margin: 0 0 .4rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .flow-step p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .workflow-band {
  display: grid;
  gap: clamp(1.1rem, 3vw, 1.8rem);
  padding-top: clamp(1rem, 3vw, 1.5rem);
  border-top: 1px dashed var(--about-line);
}

.page-about .workflow-copy p {
  margin: 0 0 .8rem;
  max-width: 44ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .workflow-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-section--slant {
  position: relative;
  margin-block: clamp(.5rem, 2vw, 1rem);
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1.1rem, 3vw, 2rem);
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  background:
    linear-gradient(160deg, rgba(57, 217, 138, .1), transparent 46%),
    linear-gradient(340deg, rgba(74, 168, 255, .12), transparent 52%),
    var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), 0 100%);
}

.page-about .role-grid {
  display: grid;
  gap: .7rem;
  margin: 1.25rem 0 clamp(1.5rem, 4vw, 2rem);
}

.page-about .role-card {
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(12, 31, 26, .62);
  overflow: hidden;
}

.page-about .role-card summary {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .85rem 1rem;
  cursor: pointer;
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  list-style: none;
}

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

.page-about .role-card summary::after {
  content: "展开";
  margin-left: auto;
  font-size: .72rem;
  font-weight: 400;
  color: var(--text-dim);
}

.page-about .role-card[open] summary::after {
  content: "收起";
  color: var(--cyan);
}

.page-about .role-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .role-tag {
  font-size: .72rem;
  color: var(--spring);
  letter-spacing: .1em;
}

.page-about .role-card p {
  margin: 0;
  padding: 0 1rem 1rem;
  font-size: .87rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .partner-block {
  display: grid;
  gap: clamp(1rem, 3vw, 1.6rem);
  padding-top: clamp(1rem, 3vw, 1.5rem);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .partner-copy h3 {
  margin: 0 0 .6rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gold);
}

.page-about .partner-copy p {
  margin: 0 0 .8rem;
  max-width: 46ch;
  font-size: .91rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .partner-facts {
  display: grid;
  gap: .55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-facts li {
  display: flex;
  align-items: baseline;
  gap: .55rem;
  padding: .7rem .85rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-line-soft);
  background: rgba(12, 31, 26, .55);
  font-size: .84rem;
  color: var(--text-dim);
}

.page-about .partner-facts .mono {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .timeline {
  display: grid;
  gap: .85rem;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 1px solid var(--about-line);
}

.page-about .timeline-node {
  --node-color: var(--grid);
  position: relative;
  padding: .9rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--about-line-soft);
  background: var(--about-card);
  transition: border-color .18s ease, background-color .18s ease;
}

.page-about .timeline-node--spring { --node-color: var(--spring); }
.page-about .timeline-node--summer { --node-color: var(--summer); }
.page-about .timeline-node--autumn { --node-color: var(--autumn); }
.page-about .timeline-node--winter { --node-color: var(--winter); }
.page-about .timeline-node--now { --node-color: var(--gold); }

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 6px);
  top: 1.25rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--node-color);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .timeline-node:hover,
.page-about .timeline-node:focus-visible {
  border-color: var(--node-color);
  background: rgba(17, 20, 24, .96);
  outline: none;
}

.page-about .timeline-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .node-version {
  display: inline-block;
  margin-bottom: .35rem;
  padding: .12rem .55rem;
  border-radius: var(--radius-pill);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--ink-deep);
  background: var(--node-color);
}

.page-about .node-body h3 {
  margin: 0 0 .35rem;
  font-size: .98rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .node-body p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .support-grid {
  align-items: start;
}

.page-about .support-card {
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--about-line);
  background: var(--panel);
}

.page-about .support-card h3 {
  margin: 0 0 .8rem;
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .support-list {
  display: grid;
  gap: .65rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .86rem;
  color: var(--text-dim);
}

.page-about .support-list li {
  display: grid;
  gap: .15rem;
  padding-bottom: .6rem;
  border-bottom: 1px dashed var(--about-line-soft);
}

.page-about .support-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .support-list .meta-key {
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--grid);
}

.page-about .support-list .mono {
  color: var(--gold);
  word-break: break-all;
}

.page-about .support-copy p {
  margin: 0 0 .9rem;
  max-width: 46ch;
  font-size: .92rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.1rem;
}

@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline {
    padding-left: 1.9rem;
  }

  .page-about .timeline-node::before {
    left: calc(-1.9rem - 6px);
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-index ol {
    flex-direction: column;
    gap: .1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index a {
    width: 100%;
    border: 0;
    border-left: 2px solid var(--about-line);
    border-radius: 0;
    padding: .55rem 0 .55rem .85rem;
    white-space: normal;
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
    color: var(--cyan);
  }

  .page-about .coord-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .seasons-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .workflow-band {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: center;
  }

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

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

  .page-about .partner-block {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: start;
  }

  .page-about .support-grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }

  .page-about .about-lede {
    max-width: 52ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .season-item,
  .page-about .timeline-node,
  .page-about .about-index a {
    transition: none;
  }

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