.page-about {
  --about-measure: 620px;
  background: var(--pitch-900);
  color: var(--paper-cream);
}

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

/* ---------- 首屏说明牌 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 4.5vw, 52px) 0 clamp(48px, 8vw, 104px);
  background: var(--pitch-950);
  border-bottom: 1px solid var(--line-moss);
}

.page-about .about-hero-img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 90% at 80% 6%, rgba(198, 242, 78, 0.14), transparent 58%),
    linear-gradient(165deg, rgba(8, 17, 13, 0.7), rgba(8, 17, 13, 0.96) 60%);
}

.page-about .about-hero-wrap {
  position: relative;
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  list-style: none;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

.page-about .crumbs a {
  color: var(--lime-200);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  text-decoration: underline;
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-moss);
}

.page-about .about-plate {
  max-width: 780px;
  padding: clamp(22px, 4vw, 46px) clamp(22px, 4vw, 46px) clamp(30px, 4.4vw, 54px);
  background: var(--paper-cream);
  color: var(--pitch-950);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  box-shadow: 0 28px 64px rgba(0, 0, 0, 0.5);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: rgba(8, 17, 13, 0.6);
}

.page-about .about-plate h1 {
  margin: 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 3.35rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--pitch-950);
}

.page-about .about-lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(8, 17, 13, 0.84);
}

.page-about .about-audience {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-audience li {
  padding: 6px 12px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--pitch-950);
  background: var(--paper-sand);
  border-left: 2px solid var(--pitch-950);
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  max-width: 720px;
  margin-bottom: clamp(28px, 4.5vw, 52px);
}

.page-about .about-head h2 {
  margin: 14px 0 0;
}

.page-about .about-head-note {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-mute);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(48px, 8vw, 104px) 0;
  background: var(--pitch-950);
}

.page-about .about-tl-texture {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
}

.page-about .about-tl {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl-row {
  display: grid;
  gap: 10px;
  align-items: start;
}

.page-about .tl-node {
  justify-self: start;
  display: inline-block;
  padding: 7px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-decoration: none;
  color: var(--lime-500);
  background: var(--pitch-900);
  border: 1px solid var(--line-moss);
  border-left: 3px solid var(--lime-500);
  transition: color 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-visible {
  color: var(--pitch-950);
  background: var(--lime-500);
  border-color: var(--lime-500);
}

.page-about .tl-card {
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--pitch-800);
  border: 1px solid var(--line-moss);
  border-radius: 2px;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  line-height: 1.45;
  color: var(--paper-cream);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-mute);
}

.page-about .tl-row:hover .tl-card,
.page-about .tl-row:focus-within .tl-card {
  transform: translateY(-4px);
  border-color: var(--lime-500);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

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

/* ---------- 窄栏长文 ---------- */
.page-about .about-team {
  padding: clamp(48px, 8vw, 104px) 0;
  background: var(--pitch-900);
  border-top: 1px solid var(--line-moss);
}

.page-about .about-team-inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-team-head h2 {
  margin: 14px 0 0;
}

.page-about .about-team-intro {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-mute);
}

.page-about .about-read {
  max-width: var(--about-measure);
}

.page-about .about-read-figure {
  margin: 0 0 26px;
}

.page-about .about-read-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line-moss);
}

.page-about .about-read-cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

.page-about .about-read p {
  margin: 0 0 18px;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 235, 217, 0.86);
}

.page-about .about-read p:first-of-type::first-letter {
  float: left;
  margin: 8px 10px 0 0;
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 0.82;
  color: var(--lime-500);
}

.page-about .about-read blockquote {
  margin: 26px 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--lime-500);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--lime-200);
}

.page-about .about-read-link {
  display: inline-block;
  margin-top: 4px;
  padding-bottom: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--lime-500);
  border-bottom: 1px solid var(--line-moss);
}

.page-about .about-read-link:hover {
  color: var(--lime-200);
  border-bottom-color: var(--lime-500);
}

/* ---------- 合作生态网格 ---------- */
.page-about .about-eco {
  padding: clamp(48px, 8vw, 104px) 0;
  background: var(--pitch-950);
  border-top: 1px solid var(--line-moss);
}

.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: clamp(10px, 1.6vw, 16px);
}

.page-about .eco-card {
  grid-column: span 6;
  display: flex;
  flex-direction: column;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--pitch-800);
  border: 1px solid var(--line-moss);
  border-radius: 2px;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.page-about .eco-card--lg {
  border-left: 3px solid var(--lime-500);
}

.page-about .eco-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.6vw, 3rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime-500);
}

.page-about .eco-suffix {
  font-size: 0.5em;
  margin-left: 2px;
}

.page-about .eco-unit {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--paper-cream);
}

.page-about .eco-desc {
  margin: 12px 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-mute);
  opacity: 0.78;
  transition: opacity 0.16s ease, color 0.16s ease;
}

.page-about .eco-card:hover,
.page-about .eco-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--lime-500);
  background: var(--pitch-900);
}

.page-about .eco-card:hover .eco-desc,
.page-about .eco-card:focus-within .eco-desc {
  opacity: 1;
  color: var(--lime-200);
}

.page-about .about-eco-link {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

/* ---------- 运营说明牌 ---------- */
.page-about .about-rules {
  padding: clamp(48px, 8vw, 104px) 0;
  background: var(--pitch-900);
  border-top: 1px solid var(--line-moss);
}

.page-about .about-rules-plate {
  max-width: 880px;
  padding: clamp(22px, 4vw, 48px);
  background: var(--paper-cream);
  color: var(--pitch-950);
  border-radius: 2px;
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.42);
}

.page-about .about-rules-plate h2 {
  margin: 14px 0 0;
  color: var(--pitch-950);
}

.page-about .about-rules-note {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(8, 17, 13, 0.74);
}

.page-about .about-faq {
  margin-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid rgba(8, 17, 13, 0.22);
}

.page-about .about-faq details {
  border-bottom: 1px solid rgba(8, 17, 13, 0.16);
}

.page-about .about-faq summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--pitch-950);
}

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

.page-about .about-faq summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: rgba(8, 17, 13, 0.55);
  transition: color 0.22s ease;
}

.page-about .about-faq details[open] summary::after {
  content: "−";
  color: var(--pitch-950);
}

.page-about .about-faq details > p {
  margin: 0 0 18px;
  padding-right: clamp(0px, 6vw, 56px);
  font-size: 0.90625rem;
  line-height: 1.85;
  color: rgba(8, 17, 13, 0.78);
}

.page-about .about-rules-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-rules-plate .btn--ghost {
  color: var(--pitch-950);
  border-color: rgba(8, 17, 13, 0.42);
}

.page-about .about-rules-plate .btn--ghost:hover {
  border-color: var(--pitch-950);
  background: rgba(8, 17, 13, 0.08);
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-about .tl-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-eco-grid .eco-card--lg {
    grid-column: span 4;
  }

  .page-about .about-eco-grid .eco-card--md {
    grid-column: span 2;
  }

  .page-about .about-eco-grid .eco-card--sm {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .page-about .about-team-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, var(--about-measure));
    gap: clamp(32px, 6vw, 88px);
    align-items: start;
  }

  .page-about .about-team-head {
    position: sticky;
    top: 48px;
  }
}

@media (min-width: 1180px) {
  .page-about .tl-row:nth-child(odd) .tl-card {
    margin-right: clamp(0px, 5vw, 72px);
  }

  .page-about .tl-row:nth-child(even) .tl-card {
    margin-left: clamp(0px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .eco-card,
  .page-about .eco-desc,
  .page-about .tl-node,
  .page-about .about-faq summary::after {
    transition: none;
  }

  .page-about .tl-row:hover .tl-card,
  .page-about .eco-card:hover,
  .page-about .eco-card:focus-within {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>