.page-about {
  position: relative;
  overflow-x: clip;
  background:
    linear-gradient(180deg, rgba(108, 59, 255, .12), rgba(7, 7, 12, 0) 460px),
    var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(30px, 5.6vw, 68px) 0 clamp(26px, 4.4vw, 52px);
  border-bottom: 1px solid var(--line);
}

.page-about .hero-grid {
  display: grid;
  gap: 26px;
}

.page-about .hero-intro h1 {
  margin: 10px 0 18px;
  font-size: clamp(29px, 6.1vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text);
}

.page-about .hero-intro .lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--text);
  opacity: .82;
}

.page-about .hero-stats {
  list-style: none;
  margin: 0;
  padding: 20px 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  background: var(--paper);
  color: var(--ink-900);
  border-radius: var(--radius);
  box-shadow: 0 18px 40px -32px rgba(0, 229, 207, .5);
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid rgba(7, 7, 12, .22);
}

.page-about .hero-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink-900);
}

.page-about .hero-stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.5;
  color: rgba(7, 7, 12, .6);
}

/* ---------- 阶段走廊 ---------- */
.page-about .about-stages {
  border-bottom: 1px solid var(--line);
}

.page-about .stage-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 0;
}

.page-about .stage-track::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 12px;
  bottom: 34px;
  width: 1px;
  background: linear-gradient(180deg, var(--violet) 0%, var(--line) 26%, var(--line) 100%);
}

.page-about .stage-node {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 18px;
  padding-bottom: clamp(30px, 5vw, 52px);
}

.page-about .stage-node:last-child {
  padding-bottom: 0;
}

.page-about .stage-axis {
  padding-top: 2px;
}

.page-about .stage-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--violet);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .stage-title {
  margin: 0 0 12px;
  font-size: clamp(19px, 3vw, 26px);
  line-height: 1.32;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .stage-body p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text);
  opacity: .8;
}

.page-about .stage-body p:last-of-type {
  margin-bottom: 0;
}

.page-about .paper-slip {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  margin: 18px 0 0;
  padding: 12px 14px;
  background: var(--paper);
  border-left: 3px solid var(--violet);
  border-radius: var(--radius-sm);
}

.page-about .paper-slip .field-label {
  color: rgba(7, 7, 12, .55);
}

.page-about .paper-slip .field-value {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: .01em;
}

.page-about .stage-media {
  margin: 20px 0 0;
  max-width: 580px;
}

/* ---------- 双口径对照 ---------- */
.page-about .about-views {
  border-bottom: 1px solid var(--line);
}

.page-about .view-compare {
  display: grid;
  gap: 20px;
}

.page-about .view-card {
  padding: 22px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .view-card h3 {
  margin: 10px 0 14px;
  font-size: clamp(18px, 2.5vw, 22px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--text);
}

.page-about .view-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .view-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
  opacity: .82;
}

.page-about .view-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

.page-about .view-card .muted {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .view-media {
  margin: 0;
}

/* ---------- 老用户回看 ---------- */
.page-about .about-archive {
  border-bottom: 1px solid var(--line);
}

.page-about .archive-grid {
  display: grid;
  gap: 26px;
}

.page-about .archive-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .archive-steps li {
  position: relative;
  padding: 18px 18px 18px 62px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .step-num {
  position: absolute;
  left: 18px;
  top: 16px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .archive-steps h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.42;
  color: var(--text);
}

.page-about .archive-steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text);
  opacity: .76;
}

.page-about .archive-side {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .archive-media {
  margin: 0;
}

.page-about .archive-contact {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  word-break: break-all;
}

/* ---------- 编号体系 ---------- */
.page-about .about-codes {
  border-bottom: 1px solid var(--line);
}

.page-about .region-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .region-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 8px;
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--text);
  transition: background .22s var(--ease), color .22s var(--ease);
}

.page-about .region-cell:hover,
.page-about .region-cell:focus-visible {
  background: var(--ink-700);
  color: var(--cyan);
}

.page-about .codes-notes {
  margin-top: 22px;
  display: grid;
  gap: 16px;
}

.page-about .codes-notes .narrative p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  opacity: .84;
}

.page-about .codes-side {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-bottom: 1px solid var(--line);
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .team-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 16px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .team-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .team-item .meter-fill {
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

.page-about .team-item .muted {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners {
  border-bottom: 1px solid var(--line);
}

.page-about .partners-grid {
  display: grid;
  gap: 24px;
}

.page-about .partners-intro .section-title {
  margin-bottom: 14px;
}

.page-about .partners-intro p {
  margin: 0 0 12px;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text);
  opacity: .82;
}

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

.page-about .partner-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .partner-points li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.page-about .partner-points .field-value {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text);
}

/* ---------- 收口 ---------- */
.page-about .about-next .section-title {
  margin-bottom: 18px;
}

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .next-links li {
  background: var(--ink-800);
}

.page-about .next-links a {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 16px;
  text-decoration: none;
  color: var(--text);
  transition: background .22s var(--ease);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  background: var(--ink-700);
}

.page-about .next-links .field-label {
  color: var(--muted);
}

.page-about .next-text {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 24px 22px;
  }

  .page-about .region-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

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

  .page-about .codes-notes {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

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

  .page-about .stage-node {
    grid-template-columns: 40px minmax(0, 1fr) 200px;
    column-gap: 26px;
  }

  .page-about .stage-node .stage-body {
    grid-column: 2;
  }

  .page-about .view-compare {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.18fr) minmax(0, 1fr);
    gap: 24px;
    align-items: stretch;
  }

  .page-about .archive-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .partners-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

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

@media (min-width: 1280px) {
  .page-about .view-card {
    padding: 26px 24px;
  }

  .page-about .stage-body p {
    font-size: 16px;
  }
}

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