.page-about {
  background: var(--bg-deep);
  color: var(--text-main);
  --about-gold-fade: rgba(201, 160, 99, 0.14);
  --about-blue-fade: rgba(62, 198, 255, 0.10);
}

.page-about .ab-hero {
  background-color: var(--bg-panel);
  background-image:
    linear-gradient(rgba(62, 198, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(62, 198, 255, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
  padding: 1.5rem 0 2.75rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--accent) 60%, transparent 100%);
  opacity: 0.55;
}

.page-about .ab-crumbs {
  display: flex;
  gap: 0.625rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  margin-bottom: 2.25rem;
}

.page-about .ab-crumbs a {
  color: var(--data);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .ab-crumbs a:hover {
  color: var(--gold-soft);
}

.page-about .ab-hero-grid {
  display: grid;
  gap: 2rem;
  align-items: end;
}

.page-about .ab-hero-tag {
  display: inline-block;
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  border: 1px solid var(--about-blue-fade);
  background: rgba(62, 198, 255, 0.06);
  padding: 0.375rem 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about .ab-hero-main h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 5vw, 3.15rem);
  line-height: 1.14;
  letter-spacing: 0.02em;
  margin: 0 0 1.25rem;
  color: var(--text-main);
  max-width: 17em;
}

.page-about .ab-hero-desc {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-dim);
  max-width: 42em;
}

.page-about .ab-hero-panel {
  background: rgba(11, 29, 42, 0.72);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
}

.page-about .ab-panel-head {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed rgba(201, 160, 99, 0.32);
  margin-bottom: 1rem;
}

.page-about .ab-quick-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.875rem 1rem;
}

.page-about .ab-quick-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .ab-stat-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.625rem;
  line-height: 1.1;
  color: var(--accent);
}

.page-about .ab-stat-num b {
  color: var(--gold-soft);
  font-weight: 700;
  font-size: 0.9em;
}

.page-about .ab-stat-label {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

.page-about .ab-panel-foot {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--text-dim);
  text-align: right;
}

.page-about .ab-chapter-map {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-top: 2.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.page-about .ab-chapter-map a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: var(--text-main);
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(19, 44, 60, 0.7);
  padding: 0.45rem 0.85rem;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .ab-chapter-map a span {
  color: var(--gold);
  font-size: 0.75rem;
}

.page-about .ab-chapter-map a:hover {
  border-color: var(--gold);
  color: var(--gold-soft);
  background: rgba(201, 160, 99, 0.08);
}

.page-about .ab-section {
  padding-top: 4.5rem;
}

.page-about .ab-sec-head {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
  position: relative;
}

.page-about .ab-sec-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 72px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .ab-sec-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.875rem;
  line-height: 1;
  color: var(--gold-soft);
  border: 1px solid var(--gold);
  padding: 0.3rem 0.5rem 0.35rem;
  min-width: 2.9rem;
  text-align: center;
  background: rgba(201, 160, 99, 0.06);
}

.page-about .ab-sec-title h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.375rem, 3.4vw, 2.25rem);
  line-height: 1.2;
  margin: 0 0 0.35rem;
  color: var(--text-main);
  transition: color 0.3s ease;
}

.page-about .ab-sec-title .ab-sec-sub {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .ab-section:target .ab-sec-title h2 {
  color: var(--accent);
}

.page-about .ab-lead {
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--text-main);
  border-left: 3px solid var(--gold);
  padding-left: 1rem;
  margin: 0 0 1.5rem;
  font-weight: 600;
}

.page-about .ab-profile-grid {
  display: grid;
  gap: 2rem;
}

.page-about .ab-copy-grid {
  display: grid;
  gap: 1.125rem;
}

.page-about .ab-copy-grid p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .ab-profile-aside {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: 1.25rem;
}

.page-about .ab-aside-index {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  color: var(--gold);
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed rgba(201, 160, 99, 0.3);
  margin-bottom: 1rem;
}

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

.page-about .ab-fact-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.625rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.875rem;
}

.page-about .ab-fact-list li:last-child {
  border-bottom: none;
}

.page-about .ab-fact-name {
  color: var(--text-dim);
}

.page-about .ab-fact-value {
  color: var(--text-main);
  font-weight: 600;
  text-align: right;
}

.page-about .ab-milestones {
  margin-top: 4rem;
  background: var(--bg-panel);
  padding-top: 4rem;
  padding-bottom: 3.5rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-milestone-grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .ab-milestone-aside {
  display: grid;
  gap: 1.5rem;
  align-content: start;
}

.page-about .ab-milestone-note {
  background: rgba(11, 29, 42, 0.65);
  border-left: 3px solid var(--gold);
  padding: 1.125rem 1.25rem;
}

.page-about .ab-note-text {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-main);
  margin: 0 0 0.75rem;
}

.page-about .ab-note-more {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0;
}

.page-about .img-frame {
  display: block;
  overflow: hidden;
  background: var(--bg-deep);
  border: 1px solid var(--line);
  padding: 0;
}

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

.page-about .ab-img-milestone img {
  aspect-ratio: 4 / 3;
}

.page-about .ab-timeline {
  position: relative;
  padding-left: 2.25rem;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--accent) 72%, transparent 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 2.25rem;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-dot {
  position: absolute;
  left: -25px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 160, 99, 0.14);
}

.page-about .tl-year {
  display: inline-block;
  font-size: 0.875rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  background: rgba(201, 160, 99, 0.1);
  padding: 0.2rem 0.625rem;
  margin-bottom: 0.625rem;
}

.page-about .tl-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.35;
  margin: 0 0 0.5rem;
  color: var(--text-main);
}

.page-about .tl-body p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0;
  max-width: 34em;
}

.page-about .ab-team-grid {
  display: grid;
  gap: 2.5rem;
}

.page-about .ab-team-copy {
  display: grid;
  gap: 1.75rem;
}

.page-about .ab-team-cards {
  display: grid;
  gap: 1rem;
}

.page-about .ab-team-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  padding: 1.125rem 1.25rem;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .ab-team-card:hover {
  border-color: var(--gold);
  transform: translateX(4px);
}

.page-about .ab-card-k {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  color: var(--gold);
  margin-bottom: 0.4rem;
}

.page-about .ab-team-card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
  color: var(--text-main);
}

.page-about .ab-team-card p {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-dim);
  margin: 0;
}

.page-about .ab-team-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
}

.page-about .ab-metric {
  padding: 1rem 1.25rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(19, 44, 60, 0.5);
}

.page-about .ab-metric:nth-child(2n) {
  border-right: none;
}

.page-about .ab-metric:nth-child(3),
.page-about .ab-metric:nth-child(4) {
  border-bottom: none;
}

.page-about .ab-metric-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.15;
  color: var(--accent);
}

.page-about .ab-metric-num b {
  color: var(--gold-soft);
  font-weight: 700;
  font-size: 0.88em;
}

.page-about .ab-metric span:last-child {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-top: 0.3rem;
}

.page-about .ab-team-aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .ab-img-team img {
  aspect-ratio: 4 / 3;
}

.page-about .ab-aside-caption {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  border-left: 2px solid var(--gold);
  padding-left: 0.75rem;
  margin: 0;
}

.page-about .ab-certs {
  margin-top: 4.5rem;
  background: var(--bg-deep);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: 4.5rem;
  padding-bottom: 3.5rem;
  position: relative;
}

.page-about .ab-certs::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(115deg, transparent 0%, var(--about-gold-fade) 44%, transparent 70%),
    linear-gradient(30deg, transparent 0%, var(--about-blue-fade) 60%, transparent 100%);
}

.page-about .ab-certs .container {
  position: relative;
}

.page-about .ab-cert-wrap {
  display: grid;
  gap: 2.5rem;
}

.page-about .ab-cert-copy {
  display: grid;
  gap: 1.5rem;
  align-content: start;
}

.page-about .ab-cert-copy p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-dim);
  margin: 0;
  max-width: 38em;
}

.page-about .ab-cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .ab-cert-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-main);
  background: rgba(19, 44, 60, 0.55);
  border: 1px solid var(--line);
  padding: 0.75rem 1rem;
}

.page-about .ab-cert-mark {
  color: var(--gold);
  font-weight: 700;
  font-size: 1.125rem;
}

.page-about .ab-cert-badge {
  position: relative;
  display: grid;
  gap: 1rem;
  justify-items: start;
  align-content: center;
}

.page-about .ab-img-cert img {
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 300px;
}

.page-about .ab-badge-label {
  position: relative;
  font-size: 0.8125rem;
  letter-spacing: 0.24em;
  color: var(--gold-soft);
  background: rgba(19, 44, 60, 0.8);
  border: 1px solid var(--gold);
  padding: 0.5rem 1rem;
}

.page-about .ab-badge-label::after {
  content: "ISO 27001 · 等保三级";
  position: absolute;
  left: 0;
  top: -2.5rem;
  white-space: nowrap;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-main);
  background: var(--bg-panel);
  border: 1px solid var(--gold);
  padding: 0.4rem 0.75rem;
  opacity: 0;
  transform: translateY(6px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.page-about .ab-cert-badge:hover .ab-badge-label::after {
  opacity: 1;
  transform: translateY(0);
}

.page-about .ab-refactor-grid {
  display: grid;
  gap: 2rem;
}

.page-about .ab-refactor-num {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: flex-start;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 8vw, 4.25rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--gold);
  paint-order: stroke fill;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem;
}

.page-about .ab-refactor-num b {
  color: var(--accent);
  font-weight: 700;
  -webkit-text-stroke: 0;
}

.page-about .ab-refactor-num span:first-child {
  color: var(--gold-soft);
  -webkit-text-stroke: 0;
}

.page-about .ab-refactor-copy h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.375rem, 3.4vw, 2rem);
  line-height: 1.3;
  margin: 0 0 1rem;
  color: var(--text-main);
}

.page-about .ab-refactor-copy > p {
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--text-dim);
  margin: 0 0 1.75rem;
  max-width: 40em;
}

.page-about .ab-path-cards {
  display: grid;
  gap: 0.875rem;
}

.page-about .ab-path {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  padding: 1rem 1.125rem;
}

.page-about .ab-path:hover {
  border-color: var(--gold);
}

.page-about .ab-path-idx {
  font-size: 0.8125rem;
  color: var(--gold);
  line-height: 1.6;
  min-width: 1.6em;
}

.page-about .ab-path-text {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .ab-path-text strong {
  color: var(--text-main);
  font-weight: 700;
  margin-right: 0.375rem;
}

.page-about .ab-refactor-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: 2rem;
}

.page-about .ab-refactor-links .btn {
  text-decoration: none;
  font-size: 0.9375rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .ab-refactor-links .btn:hover {
  transform: translateY(-2px);
}

@media (min-width: 720px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 1.55fr 0.85fr;
    gap: 2.5rem;
  }

  .page-about .ab-profile-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 2.5rem;
  }

  .page-about .ab-milestone-grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 2.75rem;
  }

  .page-about .ab-team-grid {
    grid-template-columns: 1.25fr 0.75fr;
    gap: 2.75rem;
  }

  .page-about .ab-cert-wrap {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
  }

  .page-about .ab-refactor-grid {
    grid-template-columns: 0.65fr 1.35fr;
    gap: 3rem;
  }

  .page-about .ab-refactor-num {
    border-bottom: none;
    border-right: 1px solid var(--line);
    padding-right: 1.75rem;
    padding-bottom: 0;
    min-height: 15rem;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding-top: 2.25rem;
    padding-bottom: 3.5rem;
  }

  .page-about .ab-hero-desc {
    font-size: 1.0625rem;
  }

  .page-about .ab-section {
    padding-top: 6.5rem;
  }

  .page-about .ab-profile-grid {
    gap: 4.5rem;
  }

  .page-about .ab-copy-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .page-about .ab-milestones {
    padding-top: 6.5rem;
    padding-bottom: 5.5rem;
  }

  .page-about .ab-milestone-grid {
    gap: 4.5rem;
  }

  .page-about .ab-aside-caption {
    margin-left: 1.25rem;
  }

  .page-about .ab-cert-badge {
    justify-items: center;
  }

  .page-about .ab-path-cards {
    gap: 1rem;
  }

  .page-about .ab-refactor-links {
    gap: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team-card,
  .page-about .ab-refactor-links .btn {
    transition: none;
  }

  .page-about .ab-badge-label::after,
  .page-about .ab-cert-badge:hover .ab-badge-label::after {
    display: none;
  }
}