.page-about {
  --about-gap: 20px;
  --about-pad: 64px;
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .section {
  padding-block: var(--about-pad);
  position: relative;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan-deep);
}

.page-about .breadcrumbs .breadcrumb-current {
  color: var(--amber);
  letter-spacing: 0.12em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-block: 24px 8px;
  position: relative;
}

.page-about .about-hero::before {
  content: "";
  display: block;
  height: 1px;
  max-width: var(--maxw);
  margin: 0 auto;
  background: linear-gradient(90deg, transparent, var(--line) 18%, var(--cyan-deep) 50%, var(--line) 82%, transparent);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 36px;
}

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 8.4vw, 60px);
  line-height: 1.08;
  letter-spacing: 0.05em;
  color: var(--text);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 50ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.84;
}

.page-about .about-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: var(--shape-sm);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 18px;
  background: var(--panel);
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .about-fact-text {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero-media {
  border: 1px solid var(--line);
  align-self: stretch;
}

.page-about .about-hero-media img,
.page-about .about-track-media img,
.page-about .adapt-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 原则 ---------- */

.page-about .principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: 36px;
}

.page-about .principle {
  position: relative;
  padding: 26px 22px 24px;
  background:
    linear-gradient(160deg, rgba(41, 231, 240, 0.07), transparent 58%),
    var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--shape);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.page-about .principle::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: 0.7;
}

.page-about .principle:hover,
.page-about .principle:focus-within {
  border-color: rgba(41, 231, 240, 0.42);
  transform: translateY(-4px);
  box-shadow: 0 14px 34px rgba(6, 8, 11, 0.7), 0 0 0 1px rgba(41, 231, 240, 0.12);
}

.page-about .principle-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .principle-title {
  margin: 12px 0 0;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: 0.03em;
  color: var(--text);
}

.page-about .principle-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  opacity: 0.82;
}

.page-about .principle-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
  transition: color 0.22s var(--ease);
}

.page-about .principle:hover .principle-note,
.page-about .principle:focus-within .principle-note {
  color: var(--text);
}

/* ---------- 时间线 ---------- */

.page-about .about-track-media {
  margin: 34px 0 0;
  border: 1px solid var(--line);
  background: var(--panel-soft);
}

.page-about .about-track-media .media-caption {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .tl-rail {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 34px;
}

.page-about .tl-node {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan-deep);
  clip-path: var(--shape-xs);
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .tl-node:hover {
  border-color: var(--line);
  border-left-color: var(--amber);
  background: var(--panel-soft);
}

.page-about .tl-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .tl-title {
  margin: 10px 0 0;
  font-size: 17px;
  line-height: 1.4;
  letter-spacing: 0.03em;
  color: var(--text);
}

.page-about .tl-text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 分组与编号 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

.page-about .about-body {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
  opacity: 0.82;
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 24px;
}

.page-about .about-link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-deep);
  padding-bottom: 3px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--amber);
}

.page-about .num-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .num-card {
  padding: 20px 20px 22px;
  background:
    linear-gradient(200deg, rgba(245, 184, 65, 0.07), transparent 60%),
    var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--shape-sm);
}

.page-about .num-card-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .num-card-title {
  margin: 8px 0 0;
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .num-card-value {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .num-card-value span {
  display: block;
  margin-top: 8px;
  font-family: var(--font-sans);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .num-card-text {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 34px;
}

.page-about .team-card {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  clip-path: var(--shape);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(255, 46, 136, 0.4);
  transform: translateY(-3px);
}

.page-about .team-rhythm {
  display: inline-block;
  margin: 0;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--magenta);
  border: 1px solid var(--magenta-deep);
  clip-path: var(--shape-xs);
}

.page-about .team-title {
  margin: 16px 0 0;
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--text);
}

.page-about .team-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 适配 ---------- */

.page-about .adapt-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
}

.page-about .adapt-media {
  border: 1px solid var(--line);
  background: var(--panel-soft);
}

.page-about .adapt-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .adapt-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text);
  opacity: 0.85;
}

.page-about .adapt-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--ok);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

/* ---------- 覆盖 ---------- */

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding: 30px 24px;
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(41, 231, 240, 0.1), transparent 62%),
    var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--shape-lg);
}

.page-about .coverage-num {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(52px, 14vw, 86px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--text);
  text-shadow: 0 0 26px rgba(41, 231, 240, 0.35);
}

.page-about .coverage-num span {
  display: block;
  margin-top: 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-shadow: none;
}

.page-about .coverage-note {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
  opacity: 0.8;
}

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

.page-about .scenario-list li {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background: var(--panel-soft);
}

.page-about .scenario-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .scenario-text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-bottom: 80px;
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding: 34px 24px;
  background:
    linear-gradient(115deg, rgba(255, 46, 136, 0.12), transparent 52%),
    linear-gradient(255deg, rgba(41, 231, 240, 0.14), transparent 58%),
    var(--panel);
  border: 1px solid var(--line);
  clip-path: var(--shape-lg);
}

.page-about .about-cta-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 5.6vw, 36px);
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--text);
}

.page-about .about-cta-text {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-cta-actions .btn {
  flex: 1 1 180px;
  text-align: center;
}

/* ---------- 媒体查询 ---------- */

@media (min-width: 640px) {
  .page-about {
    --about-pad: 76px;
  }

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

  .page-about .num-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .num-card:first-child {
    grid-column: span 2;
  }

  .page-about .about-cta-actions .btn {
    flex: 0 0 auto;
    min-width: 190px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-pad: 96px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
    gap: 56px;
    padding-top: 52px;
  }

  .page-about .about-hero-media {
    margin-bottom: 8px;
  }

  .page-about .principles {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .principle:nth-child(2) {
    margin-top: 42px;
  }

  .page-about .principle:nth-child(3) {
    margin-top: 18px;
  }

  .page-about .tl-rail {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
    padding-top: 30px;
  }

  .page-about .tl-rail::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan-deep) 12%, var(--cyan) 42%, var(--amber) 66%, var(--magenta-deep) 88%, transparent);
    opacity: 0.85;
  }

  .page-about .tl-node {
    border-left: 1px solid var(--line);
    border-top: 2px solid var(--cyan-deep);
  }

  .page-about .tl-node:hover {
    border-top-color: var(--amber);
    border-left-color: var(--line);
  }

  .page-about .about-split {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .num-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-about .num-card:first-child {
    grid-column: auto;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .adapt-grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 52px;
  }

  .page-about .coverage-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 48px;
    padding: 48px 44px;
    align-items: center;
  }

  .page-about .scenario-list li {
    grid-template-columns: 96px 1fr;
    gap: 18px;
    align-items: baseline;
    padding: 18px 22px;
  }

  .page-about .about-cta-inner {
    grid-template-columns: 1.3fr auto;
    align-items: center;
    gap: 40px;
    padding: 46px 44px;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-title {
    letter-spacing: 0.06em;
  }

  .page-about .about-hero-media {
    margin-left: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .team-card,
  .page-about .tl-node,
  .page-about .about-link,
  .page-about .principle-note {
    transition: none;
  }

  .page-about .principle:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}