.page-about {
  --about-gutter: clamp(18px, 5vw, 64px);
  --sec-accent: var(--violet);
  --sec-h2: clamp(30px, 5.2vw, 58px);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px var(--about-gutter) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) var(--about-gutter) clamp(44px, 8vw, 96px);
  border-bottom: 2px solid var(--ink-600);
  background-color: var(--ink-800);
  background-image:
    radial-gradient(120% 90% at 8% 0%, rgba(36, 26, 74, 0.9), rgba(36, 26, 74, 0) 62%),
    linear-gradient(90deg, rgba(27, 58, 99, 0.45) 1px, transparent 1px),
    linear-gradient(180deg, rgba(27, 58, 99, 0.26) 1px, transparent 1px);
  background-size: 100% 100%, 88px 88px, 88px 88px;
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-kicker-tag {
  font-family: var(--font-mono);
  color: var(--ink-900);
  background: var(--cyan);
  padding: 3px 9px;
  letter-spacing: 0.16em;
}

.page-about .about-kicker-line {
  display: inline-block;
  width: 44px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-kicker-meta {
  font-family: var(--font-mono);
  color: var(--lilac);
}

.page-about .about-hero h1 {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(42px, 10.5vw, 128px);
  line-height: 0.94;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-lead {
  max-width: 36em;
  margin: 28px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(42px, 6.5vw, 84px) var(--about-gutter);
  border-top: 2px solid var(--ink-600);
  background: var(--ink-800);
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: var(--sec-accent);
}

.page-about .about-sec--violet {
  --sec-accent: var(--violet);
  --sec-h2: clamp(30px, 5.2vw, 58px);
}

.page-about .about-sec--teal {
  --sec-accent: var(--teal-deep);
  --sec-h2: clamp(28px, 4.8vw, 52px);
}

.page-about .about-sec--wine {
  --sec-accent: var(--wine);
  --sec-h2: clamp(27px, 4.4vw, 46px);
}

.page-about .about-sec--ink {
  --sec-accent: var(--ink-600);
  --sec-h2: clamp(26px, 4vw, 42px);
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-sec-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-900);
  background: var(--cyan);
  padding: 3px 8px;
  flex: none;
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--sec-h2);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-sec-lead {
  max-width: 40em;
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--lilac);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin-top: 32px;
  border-bottom: 2px solid var(--ink-600);
}

.page-about .about-stage {
  border-top: 2px solid var(--ink-600);
  border-left: 4px solid transparent;
  background: var(--ink-900);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-stage[open] {
  border-left-color: var(--sec-accent);
  background: var(--ink-700);
}

.page-about .about-stage summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 20px clamp(14px, 3vw, 26px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-stage summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-about .about-stage-year {
  font-family: var(--font-mono);
  font-size: clamp(14px, 2.2vw, 18px);
  letter-spacing: 0.04em;
  color: var(--amber);
  background: rgba(255, 179, 0, 0.12);
  border: 2px solid rgba(255, 179, 0, 0.45);
  padding: 2px 8px;
}

.page-about .about-stage-title {
  font-size: clamp(16px, 2.4vw, 23px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--white);
}

.page-about .about-stage-mark {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink-600);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

.page-about .about-stage-mark::before {
  content: "+";
}

.page-about .about-stage[open] .about-stage-mark::before {
  content: "\2212";
}

.page-about .about-stage-body {
  padding: 0 clamp(14px, 3vw, 26px) 24px;
}

.page-about .about-stage-body p {
  max-width: 40em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stage-body p + p {
  margin-top: 12px;
}

/* ---------- 团队 ---------- */
.page-about .about-team-layout {
  margin-top: 32px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .about-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-team-card {
  padding: 20px 18px;
  background: var(--ink-900);
  border: 2px solid var(--ink-600);
  border-top: 4px solid var(--sec-accent);
  box-shadow: var(--shadow-soft);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
  border-color: var(--cyan);
}

.page-about .about-team-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 46px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-team-card h3 {
  margin: 8px 0 0;
  font-size: 17px;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-team-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--lilac);
}

/* ---------- 媒体 ---------- */
.page-about .about-media {
  margin: 28px 0 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--ink-600);
  background: var(--ink-900);
}

.page-about .about-media figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--lilac);
}

.page-about .about-media--square {
  margin-top: 0;
  max-width: 420px;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  counter-reset: about-flow;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-flow li {
  counter-increment: about-flow;
  position: relative;
  padding: 18px 18px 18px 60px;
  background: var(--ink-900);
  border: 2px solid var(--ink-600);
  border-left: 4px solid var(--cyan);
}

.page-about .about-flow li::before {
  content: counter(about-flow, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-flow h3 {
  margin: 0 0 6px;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--lilac);
}

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: 32px 0;
  padding: 22px 22px;
  background: var(--violet);
  border-left: 8px solid var(--amber);
  box-shadow: var(--shadow-hard);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-after {
  max-width: 40em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 规模数据 ---------- */
.page-about .about-stats {
  margin: 32px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-stat {
  padding: 18px;
  background:
    linear-gradient(135deg, rgba(0, 167, 181, 0.14), rgba(0, 167, 181, 0) 62%),
    var(--ink-900);
  border: 2px solid var(--ink-600);
}

.page-about .about-stat dt {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--lilac);
}

.page-about .about-stat dd {
  margin: 0;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-stat-unit {
  font-size: 0.5em;
  letter-spacing: 0.02em;
  margin-left: 3px;
}

.page-about .about-stat-desc {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 原则 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-rules li {
  padding-top: 16px;
  border-top: 4px solid var(--cyan);
}

.page-about .about-rule-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-rules h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-rules p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--lilac);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  margin-top: 44px;
  padding: clamp(24px, 4vw, 40px);
  background: var(--ink-900);
  border: 2px solid var(--ink-600);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta-lead {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-cta-note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--lilac);
}

.page-about .about-cta-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta-note a:hover,
.page-about .about-cta-note a:focus-visible {
  color: var(--amber);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-media--square {
    max-width: 100%;
  }
}

@media (min-width: 900px) {
  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 40px;
    align-items: start;
  }

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

  .page-about .about-media--square {
    max-width: 320px;
  }

  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-quote {
    padding: 28px 32px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1fr) 360px;
  }

  .page-about .about-media--square {
    max-width: 360px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card,
  .page-about .about-stage {
    transition: none;
  }

  .page-about .about-team-card:hover,
  .page-about .about-team-card:focus-within {
    transform: none;
  }
}
<<<END>>>