.page-about {
  --about-pad: clamp(18px, 3vw, 28px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(22px, 3.4vw, 34px) 0 clamp(40px, 6vw, 76px);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 62vw;
  height: 62vw;
  max-width: 720px;
  max-height: 720px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(43, 240, 196, 0.16), rgba(14, 116, 144, 0.06) 46%, transparent 68%);
  pointer-events: none;
}

.page-about .about-hero-crumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(22px, 3vw, 38px);
  font-size: 13px;
}

.page-about .about-hero-crumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero-crumb a:hover,
.page-about .about-hero-crumb a:focus-visible {
  color: var(--coral);
}

.page-about .about-hero-crumb li[aria-current] span,
.page-about .about-hero-crumb span[aria-current] {
  color: rgba(244, 239, 228, 0.62);
}

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

.page-about .about-hero-copy .eyebrow {
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin: 0 0 14px;
}

.page-about .about-hero-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin: 0 0 18px;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero-lead {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.84);
  margin: 0 0 14px;
  max-width: 40em;
}

.page-about .about-hero-lead--sub {
  color: var(--mist);
  font-size: clamp(14px, 1.4vw, 16px);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero .btn-outline {
  border-color: var(--line-strong);
  color: var(--paper);
  background: transparent;
}

.page-about .about-hero .btn-outline:hover,
.page-about .about-hero .btn-outline:focus-visible {
  border-color: var(--coral);
  color: var(--coral);
}

.page-about .about-hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-2);
  margin: 0;
  aspect-ratio: 4 / 3;
}

.page-about .about-hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-stat dt {
  flex: 0 0 5.2em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(154, 217, 228, 0.7);
  margin: 0;
}

.page-about .about-stat dd {
  margin: 0;
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-stat dd .data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  color: var(--neon);
  margin-right: 4px;
}

/* 主体分栏 */
.page-about .about-body {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-rail {
  border-top: 1px solid var(--line-dark-strong);
  padding-top: 14px;
}

.page-about .about-rail-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rock);
  margin: 0 0 12px;
}

.page-about .about-rail-list {
  list-style: none;
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail-list li {
  flex: 0 0 auto;
}

.page-about .about-rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 6px 12px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: border-color 180ms ease, box-shadow 180ms ease, color 180ms ease;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  border-color: var(--coral);
  color: var(--clay-ink);
  box-shadow: var(--shadow-1);
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--clay);
  letter-spacing: 0.04em;
}

.page-about .about-rail-scale {
  display: none;
  margin-top: 28px;
  padding-left: 10px;
  border-left: 1px solid var(--line-dark-strong);
  flex-direction: column;
  gap: 14px;
}

.page-about .about-rail-scale span {
  position: relative;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .about-rail-scale span::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--line-dark-strong);
}

/* 章节 */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  margin-bottom: clamp(48px, 7vw, 92px);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-num {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(52px, 9vw, 104px);
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: rgba(181, 98, 60, 0.26);
  margin-bottom: 6px;
  user-select: none;
}

.page-about .about-chapter .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--teal);
  margin: 0 0 10px;
}

.page-about .about-title {
  font-family: var(--font-display);
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--ink);
  margin: 0 0 18px;
  max-width: 22em;
}

.page-about .about-text {
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ink-2);
  margin: 0 0 14px;
  max-width: 40em;
}

.page-about .about-text strong.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  color: var(--clay-ink);
  font-weight: 700;
}

.page-about .about-quote {
  margin: 26px 0 0;
  padding: 6px 0 6px 18px;
  border-left: 3px solid var(--coral);
  font-family: var(--font-serif);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.65;
  color: var(--clay-ink);
  max-width: 30em;
}

/* 三步路线 */
.page-about .about-route {
  list-style: none;
  margin: 26px 0 32px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-route-step {
  position: relative;
  padding: 16px 16px 16px 56px;
  background: var(--haze);
  border-radius: var(--radius);
}

.page-about .about-route-num {
  position: absolute;
  left: 16px;
  top: 16px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  color: var(--teal);
}

.page-about .about-route-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .about-route-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* 宽窄交替块 */
.page-about .about-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-duo-item {
  padding: var(--about-pad);
  background: var(--haze);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  border-left: 3px solid var(--teal);
}

.page-about .about-duo-item--wide {
  border-left-color: var(--coral);
  background: var(--paper);
  border-color: var(--line-dark-strong);
}

.page-about .about-duo-item .tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--radius);
  margin: 0 0 12px;
}

.page-about .about-duo-item .tag--teal {
  background: var(--teal);
  color: var(--paper);
}

.page-about .about-duo-item .tag--moss {
  background: var(--moss);
  color: var(--paper);
}

.page-about .about-duo-item .tag--clay {
  background: var(--clay);
  color: var(--paper);
}

.page-about .about-duo-title {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-duo-item p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .about-duo-item p:last-child {
  margin-bottom: 0;
}

.page-about .about-duo-item strong.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--clay-ink);
}

.page-about .about-chapter-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .about-btn-dark {
  border-color: var(--line-dark-strong);
  color: var(--ink);
  background: transparent;
}

.page-about .about-btn-dark:hover,
.page-about .about-btn-dark:focus-visible {
  border-color: var(--coral);
  color: var(--clay-ink);
}

/* 时间线 */
.page-about .about-timeline-figure {
  margin: 0 0 26px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  aspect-ratio: 16 / 9;
}

.page-about .about-timeline-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-tabs {
  border-top: 1px solid var(--line-dark-strong);
  padding-top: 18px;
}

.page-about .about-year-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}

.page-about .about-year {
  min-height: 44px;
  min-width: 62px;
  padding: 8px 14px;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--rock);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-about .about-year:hover,
.page-about .about-year:focus-visible {
  border-color: var(--teal);
  color: var(--teal-dark);
}

.page-about .about-year[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--neon);
}

.page-about .about-year-panel {
  padding: 18px 0 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-year-panel[hidden] {
  display: none;
}

.page-about .about-year-title {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.4;
  color: var(--clay-ink);
  margin: 0 0 8px;
}

.page-about .about-year-panel p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-2);
  max-width: 40em;
}

/* 团队 */
.page-about .about-team-figure {
  margin: 0 0 22px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  aspect-ratio: 3 / 2;
}

.page-about .about-team-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.page-about .about-slice {
  padding: var(--about-pad);
  border-radius: var(--radius);
  background: var(--haze);
  color: var(--ink);
  border: 1px solid var(--line-dark);
}

.page-about .about-slice--dark {
  background: var(--ink-2);
  color: var(--paper);
  border-color: var(--ink-3);
}

.page-about .about-slice--moss {
  background: var(--moss);
  color: var(--paper);
  border-color: var(--moss);
}

.page-about .about-slice-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  color: var(--teal-dark);
}

.page-about .about-slice--dark .about-slice-num {
  color: var(--neon);
}

.page-about .about-slice--moss .about-slice-num {
  color: var(--mist);
}

.page-about .about-slice-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .about-slice p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.76;
}

.page-about .about-slice--dark p {
  color: rgba(244, 239, 228, 0.82);
}

.page-about .about-slice--moss p {
  color: rgba(244, 239, 228, 0.88);
}

/* 质量四步 */
.page-about .about-steps {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-dark-strong);
}

.page-about .about-step {
  padding: 20px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: var(--teal);
  padding: 3px 8px;
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.page-about .about-step h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-2);
  max-width: 38em;
}

/* 合作 */
.page-about .about-partner-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 24px 0 28px;
}

.page-about .about-partner-card {
  padding: var(--about-pad);
  background: var(--paper);
  border-color: var(--line-dark-strong);
  border-radius: var(--radius);
}

.page-about .about-partner-card .tag {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--radius);
  margin: 0 0 12px;
}

.page-about .about-partner-card .tag--teal {
  background: var(--teal);
  color: var(--paper);
}

.page-about .about-partner-card .tag--clay {
  background: var(--clay);
  color: var(--paper);
}

.page-about .about-partner-card .tag--moss {
  background: var(--moss);
  color: var(--paper);
}

.page-about .about-partner-card h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .about-partner-card p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.76;
  color: var(--rock);
}

.page-about .about-flow-steps {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .about-flow-step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink);
}

.page-about .about-flow-step .data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--coral);
  font-weight: 700;
}

/* 收尾 */
.page-about .about-cta {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(40px, 6vw, 76px) 0;
  border-top: 3px solid var(--teal);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: center;
}

.page-about .about-cta-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3vw, 32px);
  line-height: 1.28;
  letter-spacing: -0.025em;
  font-weight: 800;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-cta-copy p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(244, 239, 228, 0.8);
  max-width: 40em;
}

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

.page-about .about-cta .btn-primary {
  background: var(--coral);
  border-color: var(--coral);
  color: var(--ink);
}

.page-about .about-cta .btn-primary:hover,
.page-about .about-cta .btn-primary:focus-visible {
  background: var(--coral-soft);
  border-color: var(--coral-soft);
}

.page-about .about-cta .btn-quiet {
  color: var(--mist);
  border-color: var(--line-strong);
  background: transparent;
}

.page-about .about-cta .btn-quiet:hover,
.page-about .about-cta .btn-quiet:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-stat {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-stat dt {
    flex: none;
  }

  .page-about .about-route {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-route-step {
    padding: 18px 16px 18px 16px;
  }

  .page-about .about-route-num {
    position: static;
    display: block;
    margin-bottom: 8px;
  }

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

  .page-about .about-duo-item--wide {
    grid-column: 1 / -1;
  }

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

  .page-about .about-slice--wide {
    grid-column: 1 / -1;
  }

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }
}

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

  .page-about .about-hero-figure {
    aspect-ratio: 14 / 9;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(210px, 3fr) 7fr;
    gap: clamp(36px, 4.5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-rail-list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }

  .page-about .about-rail-list a {
    border-color: transparent;
    border-left: 2px solid var(--line-dark);
    border-radius: 0;
    padding: 5px 0 5px 12px;
    font-size: 14.5px;
    white-space: normal;
  }

  .page-about .about-rail-list a:hover,
  .page-about .about-rail-list a:focus-visible {
    border-left-color: var(--coral);
    border-color: var(--line-dark);
    border-left-color: var(--coral);
  }

  .page-about .about-rail-scale {
    display: flex;
  }

  .page-about .about-team-slices {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-slice--wide {
    grid-column: span 7;
  }

  .page-about .about-slice--dark {
    grid-column: span 5;
  }

  .page-about .about-slice--moss {
    grid-column: span 12;
  }

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

  .page-about .about-cta-inner {
    grid-template-columns: 1.2fr 0.8fr;
    justify-content: space-between;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-list a,
  .page-about .about-year,
  .page-about .about-cta .btn-primary,
  .page-about .about-cta .btn-quiet {
    transition: none;
  }
}