.page-about {
  --about-grid: rgba(42, 82, 69, .16);
  --about-rule: rgba(42, 82, 69, .45);
  --about-glass: rgba(16, 20, 24, .82);
  position: relative;
  background-color: var(--ink-800);
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 68px 68px;
  background-position: -1px -1px;
  color: var(--paper);
  overflow: hidden;
}

.page-about .sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mute);
}

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

.page-about .breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--line-soft);
}

.page-about .breadcrumbs .crumb-sep {
  color: var(--line-600);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 章节索引 ---------- */
.page-about .section-rail {
  display: flex;
  gap: 6px;
  margin-top: 22px;
  padding-bottom: 14px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .section-rail a {
  flex: 0 0 auto;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mute);
  text-decoration: none;
  border: 1px solid var(--line-faint);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .section-rail a:hover {
  color: var(--paper);
  border-color: var(--line-soft);
}

.page-about .section-rail a.is-active,
.page-about .section-rail a[aria-current="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 0 0 64px;
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(53, 231, 208, .13) 0%, transparent 58%),
    radial-gradient(90% 70% at 4% 92%, rgba(255, 106, 43, .10) 0%, transparent 62%);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 34px;
  align-items: start;
  padding-top: 34px;
}

.page-about .kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .kicker::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 15em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero h1 .hl {
  color: var(--cyan);
  border-bottom: 3px solid rgba(53, 231, 208, .35);
}

.page-about .page-lede {
  max-width: 40em;
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 认证卡片 ---------- */
.page-about .cert-card {
  position: relative;
  padding: 26px 24px 22px;
  background: var(--panel-900);
  border: 1px solid var(--line-soft);
  box-shadow: 0 22px 48px rgba(6, 17, 13, .55);
}

.page-about .cert-card::before {
  content: "";
  position: absolute;
  inset: 14px -10px -12px 12px;
  background: rgba(20, 51, 43, .55);
  border: 1px solid var(--line-faint);
  transform: rotate(-1.3deg);
  z-index: -1;
}

.page-about .cert-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--orange), rgba(255, 106, 43, 0));
}

.page-about .cert-stamp {
  display: inline-block;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
  border: 1px solid rgba(255, 106, 43, .55);
  transform: rotate(-2deg);
}

.page-about .cert-year {
  margin: 20px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .cert-text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .cert-meta {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-faint);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 首屏数字带 ---------- */
.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 22px;
  margin: 44px 0 0;
  padding: 24px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-faint);
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--line-soft);
}

.page-about .hs-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .hs-unit {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  position: relative;
  padding: 62px 0;
  border-top: 1px solid var(--line-faint);
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 34px;
}

.page-about .section-num {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
  border: 1px solid var(--line-soft);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--paper);
}

/* ---------- 01 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 30px;
  align-items: start;
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--panel-900);
}

.page-about .team-figure img,
.page-about .certify-figure img,
.page-about .timeline-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .team-figure img {
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .media-cap {
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
  border-top: 1px solid var(--line-faint);
}

.page-about .team-lede,
.page-about .certify-lede,
.page-about .verify-lede {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .table-scroll {
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .role-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  background: var(--about-glass);
}

.page-about .role-table th,
.page-about .role-table td {
  padding: 13px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-faint);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .role-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--mute);
  border-bottom-color: var(--line-soft);
}

.page-about .role-table tbody th {
  font-weight: 600;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .role-table td {
  color: var(--mute);
}

.page-about .role-table td.num {
  width: 70px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
}

.page-about .role-table tfoot th,
.page-about .role-table tfoot td {
  border-bottom: none;
  border-top: 1px solid var(--line-soft);
  background: rgba(20, 51, 43, .35);
}

.page-about .role-table tbody tr {
  transition: background 140ms var(--ease);
}

.page-about .role-table tbody tr:hover {
  background: rgba(53, 231, 208, .07);
}

.page-about .role-table tbody tr:hover th {
  color: var(--cyan);
}

/* ---------- 02 历程 ---------- */
.page-about .timeline-banner {
  position: relative;
  margin: 0 0 6px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .timeline-banner img {
  aspect-ratio: 16 / 7;
  object-fit: cover;
  opacity: .55;
}

.page-about .timeline-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, var(--ink-800) 0%, rgba(11, 31, 26, .1) 42%, rgba(11, 31, 26, .1) 62%, var(--ink-800) 100%);
}

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

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line-faint);
  transition: background 160ms var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 231, 208, .1);
  opacity: .4;
  transition: opacity 200ms var(--ease), transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  opacity: 1;
  transform: scale(1.2);
  box-shadow: 0 0 0 7px rgba(53, 231, 208, .18);
}

.page-about .tl-item.is-key::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 106, 43, .14);
}

.page-about .tl-item:hover {
  background: rgba(53, 231, 208, .045);
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--cyan);
}

.page-about .tl-item.is-key .tl-year {
  color: var(--orange);
}

.page-about .tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 03 认证 ---------- */
.page-about .certify-grid {
  display: grid;
  gap: 34px;
  align-items: start;
}

.page-about .cert-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .cert-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .cl-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .cert-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .cert-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .certify-tail {
  margin: 22px 0 0;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mute);
  background: rgba(20, 51, 43, .38);
  border-left: 2px solid var(--cyan);
}

.page-about .certify-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--panel-900);
}

.page-about .certify-figure img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: .85;
}

/* ---------- 04 覆盖 ---------- */
.page-about .coverage-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-soft);
}

.page-about .cov-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--panel-900);
}

.page-about .cov-cell.is-key {
  background: rgba(255, 106, 43, .1);
}

.page-about .cov-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .cov-cell.is-key .cov-num {
  color: var(--orange);
}

.page-about .cov-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mute);
}

.page-about .ways-grid {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.page-about .way {
  padding: 22px 20px;
  background: var(--about-glass);
  border: 1px solid var(--line-faint);
  border-top: 2px solid var(--line-600);
  transition: border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .way:hover {
  border-top-color: var(--cyan);
  background: rgba(20, 51, 43, .5);
}

.page-about .way-tag {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
  border: 1px solid var(--line-soft);
}

.page-about .way h3 {
  margin: 14px 0 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .way p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .coverage-tail {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .coverage-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: border-color var(--dur) var(--ease);
}

.page-about .coverage-tail a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 05 来源 ---------- */
.page-about .verify-grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .check-step {
  margin-bottom: 10px;
  background: var(--panel-900);
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--line-600);
  transition: border-color 160ms var(--ease);
}

.page-about .check-step[open] {
  border-left-color: var(--cyan);
}

.page-about .check-step summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  color: var(--paper);
}

.page-about .check-step summary::-webkit-details-marker {
  display: none;
}

.page-about .check-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .check-step[open] summary::after {
  content: "–";
}

.page-about .cs-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .cs-title {
  font-weight: 600;
}

.page-about .cs-time {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
}

.page-about .cs-body {
  padding: 0 18px 18px 42px;
}

.page-about .cs-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mute);
}

/* ---------- 06 服务 ---------- */
.page-about .reach-grid {
  display: grid;
  gap: 18px;
}

.page-about .reach-item {
  padding: 22px 20px;
  background: var(--panel-900);
  border: 1px solid var(--line-faint);
}

.page-about .reach-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 6vw, 48px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .reach-pct {
  font-size: .55em;
  margin-left: 2px;
}

.page-about .reach-label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute);
}

.page-about .reach-card {
  position: relative;
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding: 28px 24px 24px;
  background: rgba(20, 51, 43, .5);
  border: 1px solid var(--line-soft);
}

.page-about .reach-card .stamp {
  position: absolute;
  top: -11px;
  left: 22px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ink-900);
  background: var(--cyan);
}

.page-about .reach-line {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
  word-break: break-word;
}

.page-about .reach-line:last-of-type {
  margin-bottom: 0;
}

.page-about .reach-key {
  display: inline-block;
  min-width: 46px;
  margin-right: 12px;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mute);
}

.page-about .reach-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-faint);
  font-size: 13px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 尾部入口 ---------- */
.page-about .about-cta {
  padding: 58px 0 72px;
  background: var(--ink-900);
  border-top: 1px solid var(--line-soft);
}

.page-about .cta-title {
  margin: 0 0 28px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(22px, 3.4vw, 34px);
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .cta-links {
  display: grid;
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-soft);
}

.page-about .cta-link {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 18px 18px;
  text-decoration: none;
  background: var(--ink-900);
  transition: background 150ms var(--ease);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  background: rgba(53, 231, 208, .08);
}

.page-about .cta-idx {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .cta-label {
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .cta-hint {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mute);
}

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

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

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

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

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

  .page-about .reach-card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .reach-card-body {
    grid-column: 1 / 2;
  }

  .page-about .reach-card .btn {
    grid-column: 2 / 3;
    grid-row: 1 / 2;
    align-self: end;
    justify-self: end;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-bottom: 76px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, .82fr);
    gap: 56px;
    padding-top: 44px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 40px;
  }

  .page-about .certify-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 46px;
  }

  .page-about .verify-grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    gap: 46px;
  }

  .page-about .verify-lede {
    margin-bottom: 0;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .section {
    padding: 78px 0;
  }

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

@media (max-width: 420px) {
  .page-about .about-hero h1 {
    font-size: 30px;
  }

  .page-about .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .page-about .tl-item {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .tl-year {
    font-size: 18px;
  }

  .page-about .cs-body {
    padding-left: 18px;
  }
}