.page-about {
  --about-block-gap: 80px;
  --about-rail: 44px;
  position: relative;
  padding: 48px 0 96px;
  overflow-x: clip;
  background:
    radial-gradient(900px 520px at 10% -6%, rgba(123, 92, 255, 0.18), transparent 62%),
    radial-gradient(760px 460px at 94% 16%, rgba(53, 224, 216, 0.11), transparent 64%),
    radial-gradient(660px 420px at 46% 102%, rgba(242, 180, 90, 0.07), transparent 70%);
}

.page-about .about-shell {
  width: min(100% - 36px, var(--shell));
  margin-inline: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin-bottom: 28px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

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

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

.page-about .breadcrumb-item[aria-current="page"] {
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: var(--about-block-gap);
}

.page-about .about-hero h1 {
  margin: 14px 0 22px;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--text);
}

.page-about .about-lede {
  margin: 0 0 30px;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.page-about .about-hero-meta li {
  position: relative;
  padding-left: 16px;
}

.page-about .about-hero-meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--gold);
  box-shadow: 0 0 10px rgba(242, 180, 90, 0.8);
}

/* ---------- 区块节奏 ---------- */
.page-about .section {
  padding: 0;
}

.page-about .about-block {
  margin-bottom: var(--about-block-gap);
}

.page-about .section-head {
  margin-bottom: 36px;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .section-title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.22;
  color: var(--text);
}

.page-about .section-desc {
  max-width: 60ch;
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 216, 0.35);
  padding-bottom: 3px;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

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

.page-about .link-arrow:hover::after,
.page-about .link-arrow:focus-visible::after {
  transform: translateX(4px);
}

/* ---------- 01 我们在做什么 ---------- */
.page-about .about-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .intro-copy p {
  margin: 0 0 18px;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .intro-copy p:first-child {
  color: var(--text);
}

.page-about .intro-copy .link-arrow {
  margin-top: 6px;
}

.page-about .intro-panel {
  position: relative;
  padding: 24px 22px;
  background: linear-gradient(158deg, rgba(22, 32, 74, 0.92), rgba(14, 23, 51, 0.94));
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  border-radius: var(--radius);
}

.page-about .intro-panel-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

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

.page-about .intro-list li {
  position: relative;
  padding-left: 22px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .intro-mark {
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

/* ---------- 02 时间轨 ---------- */
.page-about .about-track-figure {
  margin: 0 0 44px;
}

.page-about .media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-nebula);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) brightness(0.86);
}

.page-about .media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(42, 54, 99, 0.34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 54, 99, 0.34) 1px, transparent 1px);
  background-size: 40px 40px;
  mix-blend-mode: screen;
  opacity: 0.5;
}

.page-about .media-caption {
  position: relative;
  z-index: 1;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-mute);
  background: rgba(7, 11, 26, 0.72);
  border-top: 1px solid var(--line);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 34px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--cyan) 42%, var(--line) 100%);
  opacity: 0.85;
}

.page-about .timeline-item {
  position: relative;
  padding-left: var(--about-rail);
  padding-bottom: 30px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 14px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(242, 180, 90, 0.13), 0 0 16px rgba(53, 224, 216, 0.55);
}

.page-about .phase-card {
  position: relative;
  padding: 22px 22px 26px;
  background: linear-gradient(158deg, rgba(22, 32, 74, 0.9), rgba(14, 23, 51, 0.94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 7px 7px 0 -2px rgba(42, 54, 99, 0.42);
  transition: border-color 0.22s ease, box-shadow 0.22s ease, transform 0.22s ease;
}

.page-about .phase-card::after {
  content: attr(data-phase);
  position: absolute;
  right: -1px;
  bottom: -1px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-deep);
  background: var(--cyan);
}

.page-about .phase-card:hover,
.page-about .phase-card:focus-within {
  border-color: var(--cyan);
  box-shadow: 7px 7px 0 -2px rgba(53, 224, 216, 0.24), 0 0 22px rgba(53, 224, 216, 0.14);
  transform: translateY(-2px);
}

.page-about .phase-year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .phase-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .phase-desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .phase-hint {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--cyan);
  transition: max-height 0.22s ease, opacity 0.22s ease, margin-top 0.22s ease;
}

.page-about .phase-card:hover .phase-hint,
.page-about .phase-card:focus-within .phase-hint {
  max-height: 72px;
  margin-top: 12px;
  opacity: 1;
}

.page-about .track-foot {
  margin: 4px 0 0;
  padding-left: var(--about-rail);
}

/* ---------- 03 五道关 ---------- */
.page-about .process-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 23, 51, 0.6);
}

.page-about .process-caption {
  padding: 14px 18px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
  border-bottom: 1px solid var(--line);
}

.page-about .process-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.page-about .process-table thead th {
  padding: 14px 18px;
  text-align: left;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  background: rgba(22, 32, 74, 0.7);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .process-table .th-en {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 2px;
}

.page-about .process-table tbody td {
  padding: 16px 18px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.68;
  color: var(--text-dim);
  border-bottom: 1px solid rgba(42, 54, 99, 0.55);
  vertical-align: top;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .process-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .process-table tbody tr:hover td {
  background: rgba(53, 224, 216, 0.06);
  box-shadow: inset 0 0 0 1px rgba(53, 224, 216, 0.4);
}

.page-about .process-table td strong {
  color: var(--text);
  font-weight: 700;
}

.page-about .step-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .process-figure {
  margin: 0;
  max-width: 420px;
}

/* ---------- 04 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}

.page-about .team-cards {
  display: grid;
  gap: 18px;
}

.page-about .team-card {
  position: relative;
  padding: 24px 22px 24px 74px;
  background: linear-gradient(158deg, rgba(22, 32, 74, 0.88), rgba(14, 23, 51, 0.94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .team-card:hover {
  border-color: rgba(123, 92, 255, 0.7);
  box-shadow: 0 0 20px rgba(123, 92, 255, 0.16);
}

.page-about .team-ring {
  position: absolute;
  left: 20px;
  top: 26px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid currentColor;
}

.page-about .team-ring::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 50%;
  border: 1px solid currentColor;
  opacity: 0.6;
}

.page-about .team-ring--violet { color: var(--violet); }
.page-about .team-ring--cyan { color: var(--cyan); }
.page-about .team-ring--gold { color: var(--gold); }

.page-about .team-count {
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--text);
}

.page-about .team-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--cyan);
}

.page-about .team-desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .team-figure {
  margin: 0;
  max-width: 420px;
}

/* ---------- 05 覆盖与合作 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .coverage-card {
  position: relative;
  padding: 26px 22px;
  background: rgba(14, 23, 51, 0.78);
  border: 1px solid var(--line);
  border-top: 2px solid var(--violet);
  border-radius: var(--radius);
  transition: border-top-color 0.22s ease, background-color 0.22s ease;
}

.page-about .coverage-card:hover {
  border-top-color: var(--cyan);
  background: rgba(22, 32, 74, 0.82);
}

.page-about .coverage-value {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--gold);
}

.page-about .coverage-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
}

.page-about .coverage-desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 06 长期服务 ---------- */
.page-about .longterm-panel {
  padding: 30px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(22, 32, 74, 0.72), rgba(7, 11, 26, 0.9));
}

.page-about .longterm-copy p {
  margin: 0 0 18px;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .longterm-note {
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  color: var(--text) !important;
}

.page-about .longterm-copy .link-arrow {
  margin-top: 4px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stats .stat {
  padding: 22px 18px;
  background: linear-gradient(160deg, rgba(53, 224, 216, 0.07), rgba(14, 23, 51, 0.94));
}

.page-about .about-stats .stat-value {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-stats .stat-label {
  margin: 0;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about {
    padding: 64px 0 110px;
  }

  .page-about .about-shell {
    width: min(100% - 56px, var(--shell));
  }

  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .process-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 36px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 36px;
  }

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

  .page-about .coverage-card--wide {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr);
    align-items: baseline;
    gap: 4px 24px;
  }

  .page-about .coverage-card--wide .coverage-value {
    grid-column: 1;
    margin-bottom: 0;
  }

  .page-about .coverage-card--wide .coverage-title {
    grid-column: 1;
    margin-bottom: 0;
  }

  .page-about .coverage-card--wide .coverage-desc {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 34px;
  }
}

/* ---------- 窄屏表格堆叠 ---------- */
@media (max-width: 719px) {
  .page-about .process-table {
    min-width: 0;
  }

  .page-about .process-table thead {
    display: none;
  }

  .page-about .process-table tbody tr {
    display: block;
    padding: 16px 18px;
    border-bottom: 1px solid rgba(42, 54, 99, 0.6);
  }

  .page-about .process-table tbody tr:last-child {
    border-bottom: 0;
  }

  .page-about .process-table tbody td {
    display: block;
    padding: 2px 0;
    border-bottom: 0;
  }

  .page-about .process-table tbody td[data-label]::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 3px;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-mute);
  }

  .page-about .process-table tbody td[data-label="序号"] {
    margin-bottom: 6px;
  }

  .page-about .process-table tbody td[data-label="序号"]::before {
    display: none;
  }

  .page-about .step-num {
    font-size: 18px;
  }

  .page-about .process-figure,
  .page-about .team-figure {
    max-width: 100%;
  }

  .page-about .phase-hint {
    max-height: 72px;
    margin-top: 12px;
    opacity: 1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1080px) {
  .page-about {
    padding: 72px 0 120px;
  }

  .page-about .about-shell {
    width: min(100% - 80px, var(--shell));
  }

  .page-about .about-block {
    margin-bottom: 96px;
  }

  .page-about .timeline-item {
    padding-left: 56px;
    padding-bottom: 34px;
  }

  .page-about .timeline::before {
    left: 13px;
  }

  .page-about .timeline-item::before {
    left: 6px;
    top: 16px;
  }

  .page-about .phase-card {
    padding: 26px 30px 30px;
  }

  .page-about .about-track-figure {
    margin-bottom: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .phase-card,
  .page-about .phase-hint,
  .page-about .link-arrow,
  .page-about .process-table tbody td,
  .page-about .team-card,
  .page-about .coverage-card {
    transition: none !important;
  }

  .page-about .phase-card:hover {
    transform: none;
  }
}