.page-about {
  --ab-c1: #2FE0D0;
  --ab-c2: #8FF3EA;
  --ab-c3: #FFB03A;
  --ab-c4: #FF3D7F;
  --ab-c5: #4C8FB8;
  --ab-c6: #1F6E86;
}

.page-about .ab-crumbs {
  padding-top: clamp(16px, 3vw, 30px);
}

/* ============ 首屏 ============ */

.page-about .ab-hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 6vw, 76px);
  overflow: hidden;
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .ab-hero-copy h1 {
  margin: 14px 0 0;
  font-size: var(--fs-h1);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-hero-lede {
  margin: 22px 0 0;
  max-width: 42ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.84);
}

.page-about .ab-hero-actions {
  margin-top: clamp(22px, 3vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero-visual {
  border: 2px solid var(--line);
  background: var(--ink-2);
  box-shadow: 10px 10px 0 rgba(27, 58, 92, 0.55);
  padding: clamp(10px, 2vw, 18px);
}

.page-about .ab-rail-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-hero-stats {
  margin-top: clamp(30px, 4.5vw, 56px);
}

.page-about .ab-hero-stats ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .ab-hero-stats li {
  background: var(--ink-2);
  padding: clamp(16px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .ab-stat-num {
  font-size: clamp(20px, 2.4vw, 27px);
  font-weight: 700;
  color: var(--neon);
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.page-about .ab-stat-cap {
  font-size: var(--fs-note);
  line-height: 1.5;
  color: var(--mist);
}

/* ============ 通用小节头 ============ */

.page-about .ab-head-index {
  color: var(--mist);
  font-size: var(--fs-note);
  white-space: nowrap;
}

/* ============ 我们做什么 ============ */

.page-about .ab-what-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .ab-lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.72;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about .ab-what-main p + p {
  margin-top: 16px;
  color: rgba(244, 239, 230, 0.78);
  line-height: 1.78;
}

.page-about .ab-what-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .ab-what-list li {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-what-num {
  color: var(--neon);
  font-size: var(--fs-note);
  line-height: 1.9;
}

.page-about .ab-what-list h3 {
  margin: 0 0 6px;
  font-size: var(--fs-h4);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .ab-what-list p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: rgba(244, 239, 230, 0.74);
}

/* ============ 时间线 ============ */

.page-about .ab-history-figure {
  margin: 0 0 clamp(30px, 4.5vw, 52px);
  border: 2px solid var(--line);
}

.page-about .ab-phase {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .ab-phase-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-phase-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-phase-track li {
  position: relative;
  padding: 11px 0 11px 32px;
  min-height: 46px;
}

.page-about .ab-phase-track li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
}

.page-about .ab-phase-track li:first-child::before {
  top: 50%;
}

.page-about .ab-phase-track li:last-child::before {
  bottom: 50%;
}

.page-about .ab-phase-node {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
}

.page-about .ab-phase-dot {
  position: absolute;
  left: -32px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--line);
  border: 2px solid var(--ink);
  box-sizing: border-box;
  transition: background-color 180ms ease, box-shadow 180ms ease;
}

.page-about .ab-phase-year {
  color: var(--mist);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  min-width: 76px;
}

.page-about .ab-phase-name {
  color: rgba(244, 239, 230, 0.86);
  font-size: var(--fs-small);
}

.page-about .ab-phase-node:hover .ab-phase-dot {
  background: var(--neon-soft);
}

.page-about #ab-phase-1:checked ~ .ab-phase-track [for="ab-phase-1"] .ab-phase-dot,
.page-about #ab-phase-2:checked ~ .ab-phase-track [for="ab-phase-2"] .ab-phase-dot,
.page-about #ab-phase-3:checked ~ .ab-phase-track [for="ab-phase-3"] .ab-phase-dot,
.page-about #ab-phase-4:checked ~ .ab-phase-track [for="ab-phase-4"] .ab-phase-dot,
.page-about #ab-phase-5:checked ~ .ab-phase-track [for="ab-phase-5"] .ab-phase-dot,
.page-about #ab-phase-6:checked ~ .ab-phase-track [for="ab-phase-6"] .ab-phase-dot {
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(47, 224, 208, 0.18);
}

.page-about #ab-phase-1:checked ~ .ab-phase-track [for="ab-phase-1"] .ab-phase-year,
.page-about #ab-phase-2:checked ~ .ab-phase-track [for="ab-phase-2"] .ab-phase-year,
.page-about #ab-phase-3:checked ~ .ab-phase-track [for="ab-phase-3"] .ab-phase-year,
.page-about #ab-phase-4:checked ~ .ab-phase-track [for="ab-phase-4"] .ab-phase-year,
.page-about #ab-phase-5:checked ~ .ab-phase-track [for="ab-phase-5"] .ab-phase-year,
.page-about #ab-phase-6:checked ~ .ab-phase-track [for="ab-phase-6"] .ab-phase-year {
  color: var(--neon);
}

.page-about #ab-phase-1:checked ~ .ab-phase-track [for="ab-phase-1"] .ab-phase-name,
.page-about #ab-phase-2:checked ~ .ab-phase-track [for="ab-phase-2"] .ab-phase-name,
.page-about #ab-phase-3:checked ~ .ab-phase-track [for="ab-phase-3"] .ab-phase-name,
.page-about #ab-phase-4:checked ~ .ab-phase-track [for="ab-phase-4"] .ab-phase-name,
.page-about #ab-phase-5:checked ~ .ab-phase-track [for="ab-phase-5"] .ab-phase-name,
.page-about #ab-phase-6:checked ~ .ab-phase-track [for="ab-phase-6"] .ab-phase-name {
  color: var(--paper);
}

.page-about .ab-phase-panels {
  border: 2px solid var(--line);
  border-top: 4px solid var(--neon);
  background: var(--ink-2);
  padding: clamp(20px, 3vw, 34px);
}

.page-about .ab-phase-panel {
  display: none;
}

.page-about .ab-phase-panel h3 {
  margin: 0 0 14px;
  font-size: var(--fs-h3);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .ab-phase-panel p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.8);
  max-width: 44ch;
}

.page-about .ab-phase-meta {
  margin-top: 18px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-note);
  color: var(--neon);
  letter-spacing: 0.06em;
}

.page-about #ab-phase-1:checked ~ .ab-phase-panels #ab-phase-panel-1,
.page-about #ab-phase-2:checked ~ .ab-phase-panels #ab-phase-panel-2,
.page-about #ab-phase-3:checked ~ .ab-phase-panels #ab-phase-panel-3,
.page-about #ab-phase-4:checked ~ .ab-phase-panels #ab-phase-panel-4,
.page-about #ab-phase-5:checked ~ .ab-phase-panels #ab-phase-panel-5,
.page-about #ab-phase-6:checked ~ .ab-phase-panels #ab-phase-panel-6 {
  display: block;
}

/* ============ 团队 ============ */

.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-team-list {
  margin: 0;
  border-top: 2px solid var(--line);
}

.page-about .ab-team-list > div {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-team-list dt {
  color: var(--neon);
  font-size: var(--fs-note);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.page-about .ab-team-list dd {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: rgba(244, 239, 230, 0.76);
}

.page-about .ab-team-figure {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 rgba(27, 58, 92, 0.5);
}

/* ============ 分类体系 ============ */

.page-about .ab-tax-lede {
  max-width: 56ch;
  margin: 0 0 clamp(26px, 4vw, 42px);
  font-size: var(--fs-body);
  line-height: 1.8;
  color: rgba(244, 239, 230, 0.82);
}

.page-about .ab-tax-figure {
  margin: 0 0 clamp(26px, 4vw, 42px);
  border: 2px solid var(--line);
}

.page-about .ab-tax-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-tax-item {
  background: var(--ink);
  padding: 20px 20px 26px;
  border-top: 5px solid var(--ab-c1);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .ab-tax-item:nth-child(1) {
  border-top-color: var(--ab-c1);
}

.page-about .ab-tax-item:nth-child(2) {
  border-top-color: var(--ab-c2);
}

.page-about .ab-tax-item:nth-child(3) {
  border-top-color: var(--ab-c3);
}

.page-about .ab-tax-item:nth-child(4) {
  border-top-color: var(--ab-c4);
}

.page-about .ab-tax-item:nth-child(5) {
  border-top-color: var(--ab-c5);
}

.page-about .ab-tax-item:nth-child(6) {
  border-top-color: var(--ab-c6);
}

.page-about .ab-tax-code {
  margin: 0;
  font-size: var(--fs-note);
  color: var(--mist);
  letter-spacing: 0.08em;
}

.page-about .ab-tax-item h3 {
  margin: 0;
  font-size: var(--fs-h4);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .ab-tax-count {
  margin: 0;
  font-size: var(--fs-note);
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-about .ab-tax-count strong {
  font-family: var(--font-mono);
  font-size: var(--fs-h4);
  font-weight: 700;
}

.page-about .ab-tax-item p:last-child {
  margin: 4px 0 0;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: rgba(244, 239, 230, 0.72);
}

/* ============ 用户覆盖数据带 ============ */

.page-about .ab-reach {
  margin-top: clamp(26px, 4vw, 42px);
  border: 2px solid var(--line);
  background: var(--ink-2);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
}

.page-about .ab-reach-item {
  padding: clamp(18px, 2.6vw, 26px);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-reach-item:last-child {
  border-bottom: 0;
}

.page-about .ab-reach-num {
  margin: 0 0 8px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  color: var(--neon);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .ab-reach-item p:last-child {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.72;
  color: rgba(244, 239, 230, 0.74);
}

/* ============ 合作与评审 ============ */

.page-about .ab-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 26px);
}

.page-about .ab-partner-card {
  background: var(--ink-2);
  border: 2px solid var(--line);
  padding: clamp(20px, 2.6vw, 28px);
  box-shadow: 8px 8px 0 rgba(47, 224, 208, 0.1);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-partner-num {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .ab-partner-card h3 {
  margin: 0;
  font-size: var(--fs-h4);
  color: var(--paper);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.page-about .ab-partner-card p:last-child {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(244, 239, 230, 0.74);
}

/* ============ 下一步 ============ */

.page-about .ab-next {
  border-top: 2px solid var(--line);
}

.page-about .ab-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-next-copy h2 {
  margin: 12px 0 0;
  font-size: var(--fs-h2);
  color: var(--paper);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-about .ab-next-copy p:last-child {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: var(--fs-small);
  line-height: 1.78;
  color: rgba(244, 239, 230, 0.76);
}

.page-about .ab-next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .ab-next-links li {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-next-links a {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 12px;
  padding: 18px 4px;
  text-decoration: none;
  color: var(--paper);
  transition: transform 180ms ease, color 180ms ease;
}

.page-about .ab-next-key {
  font-size: var(--fs-note);
  color: var(--mist);
}

.page-about .ab-next-label {
  font-size: var(--fs-body);
  font-weight: 600;
}

.page-about .ab-next-arrow {
  color: var(--neon);
  font-size: var(--fs-small);
}

.page-about .ab-next-links a:hover,
.page-about .ab-next-links a:focus-visible {
  transform: translate(6px, -4px);
  color: var(--neon-soft);
}

/* ============ 断点 ============ */

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

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

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

  .page-about .ab-reach-item {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .ab-reach-item:last-child {
    border-right: 0;
  }

  .page-about .ab-next-links {
    border-top-width: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .ab-what-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .ab-phase {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: clamp(28px, 3vw, 48px);
  }

  .page-about .ab-phase-track {
    padding-top: 6px;
  }

  .page-about .ab-next-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-phase-dot,
  .page-about .ab-next-links a {
    transition: none;
  }

  .page-about .ab-next-links a:hover,
  .page-about .ab-next-links a:focus-visible {
    transform: none;
  }
}
<<<END>>>