.page-about {
  --about-rail: 32px;
  --about-line-x: 8px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 20px;
}

.page-about .about-hero .page-title {
  margin-top: 14px;
  max-width: 18em;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: var(--measure);
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-figures {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figures .stat {
  background: var(--panel);
  padding: 18px 16px 20px;
  min-width: 0;
}

.page-about .about-figures .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 8vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-figures .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-anchors {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-anchors a {
  display: inline-block;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-anchors a:hover,
.page-about .about-anchors a:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节公共 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--line);
}

.page-about .about-lead {
  margin: 16px 0 0;
  max-width: var(--measure);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .media-frame--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 分工 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 28px;
}

.page-about .team-list {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.page-about .team-row {
  min-width: 0;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .team-row:hover,
.page-about .team-row:focus-within {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .team-row__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .team-row__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .team-row__num {
  margin-left: auto;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--text);
  white-space: nowrap;
}

.page-about .team-bar {
  display: block;
  height: 5px;
  margin: 12px 0 11px;
  background: var(--panel-deep);
  border: 1px solid var(--line);
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  width: 6%;
}

.page-about .team-bar__fill--a {
  width: 46%;
  background: var(--cyan);
}

.page-about .team-bar__fill--b {
  width: 26%;
  background: var(--blue);
}

.page-about .team-bar__fill--c {
  width: 17%;
  background: var(--green);
}

.page-about .team-bar__fill--d {
  width: 11%;
  background: var(--yellow);
}

.page-about .team-row__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-note {
  min-width: 0;
  padding: 16px 18px;
  background: var(--panel-deep);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .team-note p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 时间轨道 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 var(--about-rail);
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: var(--about-line-x);
  top: 30px;
  bottom: 16px;
  width: 1px;
  background: var(--line);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: 8px;
  left: calc(var(--about-line-x) - var(--about-rail) - 4px);
  width: 8px;
  height: 8px;
  background: var(--cyan);
}

.page-about .timeline__item--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 224, 208, 0.18);
}

.page-about .timeline__body {
  max-width: var(--measure);
  min-width: 0;
}

.page-about .timeline__year {
  display: block;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .timeline__title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 一次改动 ---------- */
.page-about .steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .step__no {
  font-size: 1.0625rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .step__body {
  min-width: 0;
}

.page-about .step__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .step__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 服务对象 ---------- */
.page-about .audience-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.page-about .audience {
  min-width: 0;
  padding: 20px 18px;
}

.page-about .audience__title {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .audience__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .audience__rhythm {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--secondary, var(--muted));
  color: var(--muted);
}

/* ---------- 合作方式 ---------- */
.page-about .coop-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 28px;
}

.page-about .coop-list {
  min-width: 0;
}

.page-about .coop-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .coop-item:first-child {
  border-top: 1px solid var(--line);
}

.page-about .coop-item__key {
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--yellow);
}

.page-about .coop-item__body {
  min-width: 0;
}

.page-about .coop-item__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .coop-item__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .coop-item__body a,
.page-about .coop-cta__hint a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 224, 208, 0.35);
}

.page-about .coop-item__body a:hover,
.page-about .coop-cta__hint a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .coop-cta {
  min-width: 0;
  padding: 22px 18px;
}

.page-about .coop-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .coop-cta__text {
  margin: 0 0 16px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .coop-cta .btn {
  margin-bottom: 10px;
}

.page-about .coop-cta__hint {
  margin: 8px 0 0;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .timeline {
    padding-left: 44px;
  }

  .page-about .timeline__item::before {
    left: calc(var(--about-line-x) - 44px - 4px);
  }

  .page-about .coop-item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

  .page-about .coop-item__key {
    padding-top: 3px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero {
    padding-top: 8px;
  }

  .page-about .team-layout,
  .page-about .coop-layout {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .coop-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  .page-about .timeline {
    padding-left: 64px;
  }

  .page-about .timeline__item::before {
    left: calc(var(--about-line-x) - 64px - 4px);
  }

  .page-about .about-figure {
    margin-top: 36px;
  }
}

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

.page-about {
  --secondary: currentColor;
}