.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .body-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
  margin: 0 0 14px;
  max-width: 60ch;
}

.page-about .section {
  padding: clamp(44px, 6vw, 84px) 0;
}

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

.page-about .section-title {
  font-size: clamp(1.5rem, 4vw, 2.6rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--paper);
}

.page-about .section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .section-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  margin: 0;
  max-width: 40ch;
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  position: relative;
  padding: clamp(26px, 5vw, 56px) 0 clamp(40px, 6vw, 74px);
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(120% 95% at 92% -14%, rgba(255, 107, 44, 0.24), transparent 62%),
    radial-gradient(90% 80% at -6% 112%, rgba(30, 144, 255, 0.2), transparent 62%),
    var(--ink);
}

.page-about .hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -70px;
  width: 220px;
  height: 220px;
  transform: rotate(18deg);
  background: repeating-linear-gradient(
    45deg,
    rgba(255, 107, 44, 0.16) 0 6px,
    transparent 6px 14px
  );
  pointer-events: none;
}

.page-about .breadcrumb {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
  margin-bottom: 26px;
}

.page-about .breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

.page-about .hero__title {
  font-size: clamp(2.3rem, 8vw, 5.2rem);
  font-weight: 300;
  line-height: 1.04;
  letter-spacing: -0.035em;
  margin: 0 0 20px;
  max-width: 14ch;
  color: var(--paper);
}

.page-about .lede {
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
  max-width: 58ch;
  margin: 0;
}

.page-about .hero__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin-top: clamp(28px, 4vw, 40px);
  border: 2px solid var(--line);
  background: var(--line);
}

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

.page-about .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .metric__unit {
  font-size: 0.46em;
  margin-left: 3px;
  color: var(--silver);
}

.page-about .metric__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

/* ---------- 图片框 ---------- */
.page-about .shot {
  --shot-shadow: var(--blue);
  margin: 0;
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: 8px 8px 0 var(--shot-shadow);
}

.page-about .shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .shot figcaption {
  font-size: 12px;
  line-height: 1.6;
  color: var(--silver);
  padding: 10px 12px;
  border-top: 2px solid var(--line);
}

/* ---------- 起点 ---------- */
.page-about .origin__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .origin__points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .origin__points li {
  position: relative;
  padding: 12px 0 12px 24px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  border-bottom: 1px dashed var(--line);
}

.page-about .origin__points li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 8px;
  height: 8px;
  background: var(--blue);
  transform: rotate(45deg);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  display: grid;
  gap: 0;
}

.page-about .stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-bottom: 18px;
}

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

.page-about .stage__year {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
  background: var(--ink);
  padding: 2px 10px 2px 0;
}

.page-about .stage__card {
  background: var(--panel);
  border: 2px solid var(--line);
  box-shadow: 7px 7px 0 rgba(30, 144, 255, 0.22);
  transition: box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .stage__card[open] {
  border-color: var(--orange);
  box-shadow: 7px 7px 0 rgba(255, 107, 44, 0.3);
}

.page-about .stage__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .stage__head::-webkit-details-marker {
  display: none;
}

.page-about .stage__head::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1;
  color: var(--orange);
}

.page-about .stage__card[open] > .stage__head::after {
  content: "−";
}

.page-about .stage__title {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .stage__metric {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--lime);
  padding: 3px 8px;
}

.page-about .stage__body {
  padding: 0 16px 18px;
  border-top: 1px dashed var(--line);
  margin-top: -2px;
  padding-top: 14px;
}

.page-about .stage__body p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
  margin: 0 0 12px;
}

.page-about .stage__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .stage__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--paper);
  margin-bottom: 6px;
}

.page-about .stage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--blue);
}

/* ---------- 团队 ---------- */
.page-about .crew-section {
  background: var(--paper);
  color: var(--ink);
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}

.page-about .crew-section .section-title {
  color: var(--ink);
}

.page-about .crew-section .eyebrow {
  color: var(--blue-deep);
}

.page-about .crew-section .body-text {
  color: #333d4f;
}

.page-about .crew-section .shot {
  --shot-shadow: var(--orange);
  border-color: var(--ink);
}

.page-about .crew-section .shot figcaption {
  color: #4a5568;
  border-top-color: var(--line);
}

.page-about .crew__intro {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .duty {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .duty li {
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.75;
  color: #333d4f;
  border-bottom: 1px dashed #b9c2d0;
}

.page-about .duty strong {
  display: inline-block;
  margin-right: 8px;
  color: var(--ink);
  font-weight: 700;
  border-bottom: 3px solid var(--orange);
}

.page-about .crew__board {
  border: 2px solid var(--ink);
  background: var(--paper);
  padding: clamp(16px, 3vw, 26px);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-about .crew__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: 16px;
}

.page-about .crew__headline {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .crew__hint {
  font-size: 12px;
  color: #4a5568;
}

.page-about .crew__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15px, 1fr));
  gap: 4px;
  margin-bottom: 18px;
}

.page-about .seat {
  display: block;
  aspect-ratio: 1 / 1;
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .seat--data {
  background: var(--orange);
}

.page-about .seat--tech {
  background: var(--blue);
}

.page-about .seat--biz {
  background: var(--blue-deep);
}

.page-about .seat:hover {
  transform: translateY(-3px) scale(1.2);
  box-shadow: 0 0 0 2px var(--ink);
}

.page-about .legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: #333d4f;
}

.page-about .legend li {
  display: flex;
  align-items: center;
  gap: 7px;
}

.page-about .legend__dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
}

.page-about .legend__dot--data {
  background: var(--orange);
}

.page-about .legend__dot--tech {
  background: var(--blue);
}

.page-about .legend__dot--biz {
  background: var(--blue-deep);
}

/* ---------- 数据流 ---------- */
.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .flow__step {
  background: var(--panel);
  padding: 20px 18px;
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 8px;
}

.page-about .flow__step h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .flow__step p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--silver);
  margin: 0;
}

.page-about .source__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--paper);
  border-left: 4px solid var(--orange);
  background: var(--panel);
}

/* ---------- 用户分布 ---------- */
.page-about .reach__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  margin-top: 6px;
}

.page-about .reach__big {
  border: 2px solid var(--line);
  background: linear-gradient(160deg, rgba(255, 107, 44, 0.14), transparent 62%), var(--panel);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(3rem, 9vw, 5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .reach__unit {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--silver);
  margin: 8px 0 16px;
}

.page-about .reach__big .body-text {
  max-width: none;
  margin: 0;
}

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

.page-about .reach__row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .reach__rank {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .reach__rank::before {
  content: "▍";
  color: var(--lime);
  margin-right: 6px;
}

.page-about .reach__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
  padding-left: 16px;
}

.page-about .reach__tail {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 68ch;
}

/* ---------- 认可 ---------- */
.page-about .honor__grid {
  display: grid;
  gap: 16px;
}

.page-about .honor__card {
  border: 2px solid var(--line);
  background: var(--panel);
  padding: clamp(20px, 3vw, 28px);
  box-shadow: 6px 6px 0 rgba(57, 255, 20, 0.16);
}

.page-about .honor__card--alt {
  box-shadow: 6px 6px 0 rgba(30, 144, 255, 0.26);
}

.page-about .honor__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--lime);
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .honor__card--alt .honor__year {
  background: var(--blue);
  color: var(--paper);
}

.page-about .honor__card h3 {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .honor__card p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--silver);
  margin: 0;
}

.page-about .honor__tail {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
  max-width: 62ch;
}

/* ---------- 下一步 ---------- */
.page-about .next__figure {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .next__grid {
  display: grid;
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
  margin-bottom: 28px;
}

.page-about .next__item {
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .next__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .next__item h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .next__item p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--silver);
  margin: 0;
}

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

/* ---------- 平板/桌面 ---------- */
@media (min-width: 720px) {
  .page-about .hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .section-head {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .section-note {
    text-align: right;
    justify-self: end;
  }

  .page-about .origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .crew__intro {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

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

  .page-about .reach__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

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

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

@media (min-width: 900px) {
  .page-about .stage {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 24px;
    padding-bottom: 22px;
  }

  .page-about .stage__rail {
    position: sticky;
    top: 96px;
    align-self: start;
    justify-content: flex-end;
  }

  .page-about .stage__year {
    font-size: 1.75rem;
    padding-right: 12px;
  }

  .page-about .timeline {
    position: relative;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 47px;
    top: 10px;
    bottom: 16px;
    width: 2px;
    background: linear-gradient(180deg, var(--orange), var(--blue) 58%, var(--line));
  }

  .page-about .stage__head {
    padding: 18px 22px;
  }

  .page-about .stage__title {
    font-size: 16px;
  }

  .page-about .stage__body {
    padding: 16px 22px 20px;
  }

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

  .page-about .crew__grid {
    grid-template-columns: repeat(auto-fill, minmax(18px, 1fr));
    gap: 5px;
  }
}

@media (min-width: 1200px) {
  .page-about .hero__title {
    max-width: 12ch;
  }

  .page-about .lede {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .seat,
  .page-about .stage__card {
    transition: none;
  }

  .page-about .seat:hover {
    transform: none;
  }
}