.page-about {
  --about-deep: var(--color-deep-blue);
  --about-gold: var(--color-gold);
  --about-orange: var(--color-orange);
  --about-electric: var(--color-electric);
  --about-peacock: var(--color-peacock);
  --about-violet: var(--color-violet);
  --about-cream: var(--color-cream);
  --about-gray: var(--color-gray);
  --about-ink: var(--color-ink);
  --about-border: 2px solid var(--color-gold);
  --about-border-deep: 2px solid var(--color-deep-blue);
  --about-shadow: 6px 6px 0 rgba(11, 27, 58, 0.22);
  --about-shadow-soft: 4px 4px 0 rgba(27, 27, 31, 0.12);
  background: var(--about-cream);
  color: var(--about-ink);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

.page-about .about-hero {
  background: var(--about-deep);
  color: var(--about-cream);
  padding: 2rem 0 3rem;
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--about-gold) 0%, var(--about-peacock) 55%, var(--about-violet) 100%);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 2.5rem;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-aside {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-left: 2px solid var(--about-gold);
  padding-left: 1rem;
}

.page-about .about-hero-code {
  font-family: var(--font-accents);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  color: var(--about-peacock);
  text-transform: uppercase;
}

.page-about .about-hero-eyebrow {
  font-family: var(--font-accents);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  margin: 0 0 0.5rem;
  padding: 0.25rem 0.75rem;
  display: inline-block;
  background: rgba(212, 184, 77, 0.16);
  border: 1px solid rgba(212, 184, 77, 0.55);
  color: var(--about-gold);
}

.page-about .about-hero h1 {
  font-family: var(--font-headings);
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  color: var(--about-cream);
  text-shadow: 4px 4px 0 rgba(212, 184, 77, 0.25);
  max-width: 12em;
}

.page-about .about-hero-lead {
  font-size: clamp(1rem, 1.8vw, 1.1875rem);
  line-height: 1.9;
  max-width: 42em;
  margin: 0 0 1.75rem;
  color: rgba(255, 249, 239, 0.9);
}

.page-about .about-hero-lead strong {
  color: var(--about-gold);
  font-weight: 700;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .about-hero-meta {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 249, 239, 0.2);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-family: var(--font-accents);
  font-size: var(--fs-small);
  color: rgba(255, 249, 239, 0.7);
  letter-spacing: 0.04em;
}

.page-about .about-hero-meta span {
  position: relative;
}

.page-about .about-hero-meta span:not(:last-child)::after {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--about-gold);
  margin-left: 1.5rem;
  vertical-align: middle;
}

/* 01 我们是谁 */
.page-about .about-identity {
  padding: 3.5rem 0;
  background: var(--about-cream);
}

.page-about .about-identity-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-identity-aside {
  border-left: 3px solid var(--about-violet);
  padding-left: 1rem;
  filter: drop-shadow(2px 2px 0 rgba(139, 92, 246, 0.18));
}

.page-about .about-identity-main h2 {
  font-family: var(--font-headings);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.2;
  color: var(--about-deep);
  margin: 0 0 1.5rem;
  max-width: 20em;
  position: relative;
  padding-bottom: 1rem;
}

.page-about .about-identity-main h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 96px;
  height: 4px;
  background: linear-gradient(90deg, var(--about-gold), var(--about-orange));
}

.page-about .about-identity-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-identity-cols p {
  margin: 0;
  font-size: 1rem;
}

.page-about .about-identity-lead {
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--about-deep);
  font-weight: 500;
}

.page-about .about-identity-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

/* 02 时间线 */
.page-about .about-timeline {
  background: var(--about-deep);
  color: var(--about-cream);
  padding: 3.5rem 0 4rem;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(25, 211, 218, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(25, 211, 218, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}

.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.page-about .about-timeline-aside {
  border-left: 3px solid var(--about-gold);
  padding-left: 1rem;
}

.page-about .about-timeline-period {
  display: block;
  font-family: var(--font-accents);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--about-gold);
  margin: 0.5rem 0 1rem;
}

.page-about .about-timeline-note {
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(255, 249, 239, 0.75);
  max-width: 16em;
  margin: 0;
}

.page-about .about-timeline-head {
  margin-bottom: 2rem;
}

.page-about .about-timeline-head h2 {
  font-family: var(--font-headings);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  color: var(--about-cream);
  margin: 0 0 0.5rem;
}

.page-about .about-timeline-head p {
  color: rgba(255, 249, 239, 0.72);
  max-width: 36em;
  margin: 0;
  font-size: var(--fs-small);
}

.page-about .about-timeline-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-timeline-art {
  position: relative;
  border: var(--about-border);
  box-shadow: var(--about-shadow);
  filter: saturate(1.1);
}

.page-about .about-timeline-art::after {
  content: "";
  position: absolute;
  right: -12px;
  top: 24px;
  width: 24px;
  height: 24px;
  background: var(--about-orange);
  border: 2px solid var(--about-deep);
  transform: rotate(45deg);
  z-index: 2;
}

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

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

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 32px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--about-gold) 0%, var(--about-peacock) 55%, var(--about-orange) 100%);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 2.25rem 80px;
}

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

.page-about .timeline-marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--about-deep);
  border: 2px solid var(--about-gold);
  box-shadow: 0 0 20px rgba(212, 184, 77, 0.55);
  font-family: var(--font-accents);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--about-gold);
  z-index: 2;
}

.page-about .timeline-card {
  background: rgba(255, 249, 239, 0.06);
  border: 1px solid rgba(255, 249, 239, 0.14);
  border-left: 3px solid var(--about-peacock);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  backdrop-filter: blur(2px);
}

.page-about .timeline-card h3 {
  font-family: var(--font-headings);
  font-size: 1.0625rem;
  color: var(--about-cream);
  margin: 0 0 0.375rem;
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 0.875rem;
  color: rgba(255, 249, 239, 0.85);
}

.page-about .timeline-card--feature {
  border-color: var(--about-gold);
  border-left: 3px solid var(--about-gold);
  background: linear-gradient(135deg, rgba(212, 184, 77, 0.13), rgba(212, 184, 77, 0.02));
}

/* 03 服务能力 */
.page-about .about-stats {
  padding: 4rem 0;
  background: var(--about-cream);
}

.page-about .about-stats-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.page-about .about-stats-head h2 {
  font-family: var(--font-headings);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  color: var(--about-deep);
  margin: 0.25rem 0 0;
}

.page-about .about-stats-desc {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--about-ink);
  opacity: 0.75;
  max-width: 30em;
}

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

.page-about .about-stat-card {
  background: var(--about-deep);
  color: var(--about-cream);
  border: var(--about-border);
  box-shadow: var(--about-shadow-soft);
  border-radius: var(--radius);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-height: 128px;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.page-about .about-stat-card:hover,
.page-about .about-stat-card:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(11, 27, 58, 0.28);
}

.page-about .about-stat-num {
  font-family: var(--font-headings);
  font-size: clamp(1.625rem, 4vw, 2.75rem);
  line-height: 1;
  color: var(--about-gold);
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.1em;
}

.page-about .about-stat-plus,
.page-about .about-stat-unit {
  font-size: 0.62em;
  color: var(--about-orange);
  opacity: 0.9;
}

.page-about .about-stat-label {
  font-size: var(--fs-small);
  color: rgba(255, 249, 239, 0.8);
}

.page-about .about-stats-visual {
  margin-top: 2.5rem;
  border: 2px solid var(--about-deep);
  box-shadow: var(--about-shadow);
  position: relative;
  background: var(--about-gray);
}

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

.page-about .about-stats-visual-note {
  padding: 0.75rem 1rem;
  border-top: 1px solid rgba(11, 27, 58, 0.14);
}

.page-about .about-stats-more {
  margin-top: 2rem;
  border: 1px solid rgba(11, 27, 58, 0.22);
  border-left: 4px solid var(--about-electric);
  padding: 0.75rem 1rem;
  background: var(--about-gray);
  border-radius: var(--radius);
}

.page-about .about-stats-more summary {
  cursor: pointer;
  font-weight: 700;
  font-family: var(--font-accents);
  color: var(--about-deep);
  padding: 0.25rem 0;
  list-style: none;
}

.page-about .about-stats-more summary::-webkit-details-marker {
  display: none;
}

.page-about .about-stats-more summary::before {
  content: "+";
  display: inline-block;
  margin-right: 0.5rem;
  color: var(--about-orange);
  font-family: var(--font-accents);
}

.page-about .about-stats-more[open] summary::before {
  content: "–";
}

.page-about .about-stats-more p {
  margin: 0.5rem 0 0.25rem;
  font-size: var(--fs-small);
  line-height: 1.9;
  color: var(--about-ink);
}

/* 04 本地化 */
.page-about .about-local {
  background: var(--about-gray);
  padding: 4rem 0;
  position: relative;
}

.page-about .about-local::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 8px;
  background:
    linear-gradient(135deg, transparent 0, transparent 48%, var(--about-peacock) 48%, var(--about-peacock) 52%, transparent 52%),
    linear-gradient(45deg, transparent 0, transparent 48%, var(--about-gold) 48%, var(--about-gold) 52%, transparent 52%);
  background-size: 24px 24px;
  opacity: 0.8;
}

.page-about .about-local-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-local-aside {
  border-left: 3px solid var(--about-peacock);
  padding-left: 1rem;
}

.page-about .about-local-main h2 {
  font-family: var(--font-headings);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  color: var(--about-deep);
  margin: 0 0 1.5rem;
  position: relative;
  padding-bottom: 0.875rem;
}

.page-about .about-local-main h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 88px;
  height: 3px;
  background: linear-gradient(90deg, var(--about-peacock), var(--about-violet));
}

.page-about .about-local-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .about-local-image {
  border: 2px solid var(--about-deep);
  box-shadow: 6px 6px 0 rgba(25, 211, 218, 0.3);
  background: var(--about-cream);
}

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

.page-about .about-local-text p {
  margin: 0 0 1rem;
  font-size: var(--fs-small);
  color: var(--about-ink);
}

.page-about .about-local-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-local-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

/* 05 安全与审核 */
.page-about .about-security {
  background: var(--about-deep);
  color: var(--about-cream);
  padding: 4rem 0;
  position: relative;
}

.page-about .about-security::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle at 30% 30%, rgba(139, 92, 246, 0.35), transparent 70%);
  pointer-events: none;
}

.page-about .about-security-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
  z-index: 1;
}

.page-about .about-security-aside {
  border-left: 3px solid var(--about-violet);
  padding-left: 1rem;
}

.page-about .about-security-main h2 {
  font-family: var(--font-headings);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  color: var(--about-cream);
  margin: 0 0 1rem;
}

.page-about .about-security-intro {
  color: rgba(255, 249, 239, 0.82);
  font-size: 1rem;
  max-width: 40em;
  margin: 0 0 2rem;
}

.page-about .security-levels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .security-level {
  display: grid;
  grid-template-columns: 3.25rem 1fr;
  gap: 0.75rem;
  align-items: start;
  background: rgba(255, 249, 239, 0.05);
  border: 1px solid rgba(255, 249, 239, 0.12);
  border-radius: var(--radius);
  padding: 1rem;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.page-about .security-level:hover {
  border-color: rgba(139, 92, 246, 0.6);
  background: rgba(139, 92, 246, 0.06);
}

.page-about .security-level-num {
  font-family: var(--font-accents);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--about-violet);
  line-height: 1;
}

.page-about .security-level-body h3 {
  font-family: var(--font-headings);
  font-size: 1.0625rem;
  color: var(--about-cream);
  margin: 0 0 0.25rem;
}

.page-about .security-level-body p {
  margin: 0;
  font-size: var(--fs-small);
  color: rgba(255, 249, 239, 0.78);
  line-height: 1.8;
}

.page-about .about-security-foot {
  margin: 2rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 249, 239, 0.14);
  font-size: var(--fs-small);
  color: rgba(255, 249, 239, 0.68);
  max-width: 42em;
}

/* 06 联系方式 */
.page-about .about-contact {
  padding: 4rem 0 5rem;
  background: var(--about-cream);
}

.page-about .about-contact-card {
  background: var(--about-deep);
  color: var(--about-cream);
  border: 2px solid var(--about-gold);
  box-shadow: 8px 8px 0 rgba(212, 184, 77, 0.32);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-contact-card::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 184, 77, 0.18), transparent 70%);
  pointer-events: none;
}

.page-about .about-contact-aside {
  border-left: 3px solid var(--about-orange);
  padding-left: 1rem;
}

.page-about .about-contact-main h2 {
  font-family: var(--font-headings);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--about-cream);
  margin: 0 0 0.5rem;
}

.page-about .about-contact-intro {
  color: rgba(255, 249, 239, 0.78);
  font-size: var(--fs-small);
  max-width: 34em;
  margin: 0 0 1.5rem;
}

.page-about .about-contact-list {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.page-about .about-contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  padding: 0.875rem 1rem;
  background: rgba(255, 249, 239, 0.07);
  border-left: 3px solid var(--about-gold);
  border-radius: var(--radius);
  font-size: var(--fs-small);
}

.page-about .about-contact-key {
  font-family: var(--font-accents);
  font-size: 0.8125rem;
  color: var(--about-gold);
  min-width: 5.5em;
  font-weight: 700;
}

.page-about .about-contact-list a {
  color: var(--about-cream);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* 桌面断点 */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 3rem 0 4rem;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 220px 1fr;
    gap: 2.5rem;
  }

  .page-about .about-hero-aside {
    padding-top: 2rem;
    border-left: none;
    border-left: 3px solid var(--about-gold);
  }

  .page-about .about-identity-grid {
    grid-template-columns: 220px 1fr;
    gap: 3rem;
  }

  .page-about .about-identity-aside {
    padding-top: 0.25rem;
  }

  .page-about .about-identity-cols {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .page-about .about-timeline-grid {
    grid-template-columns: 220px 1fr;
    gap: 3rem;
  }

  .page-about .about-timeline-aside {
    padding-top: 0.25rem;
  }

  .page-about .about-timeline-body {
    grid-template-columns: 220px 1fr;
    gap: 2.5rem;
  }

  .page-about .about-timeline-art {
    position: sticky;
    top: 100px;
    align-self: start;
    max-height: 480px;
    overflow: hidden;
  }

  .page-about .about-stats-head {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .page-about .about-stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-stat-card {
    min-height: 160px;
    padding: 1.75rem 1.5rem;
  }

  .page-about .about-local-grid {
    grid-template-columns: 220px 1fr;
    gap: 3rem;
  }

  .page-about .about-local-cols {
    grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
    gap: 2rem;
    align-items: center;
  }

  .page-about .about-security-grid {
    grid-template-columns: 220px 1fr;
    gap: 3rem;
  }

  .page-about .security-levels {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about .about-contact-card {
    grid-template-columns: 220px 1fr;
    gap: 3rem;
    padding: 2.5rem;
  }

  .page-about .about-contact-list {
    grid-template-columns: 1fr 1fr;
    gap: 0.875rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-timeline-body {
    grid-template-columns: 240px 1fr;
  }

  .page-about .about-stat-card {
    padding: 2rem 1.75rem;
  }

  .page-about .about-stats-visual {
    display: grid;
    grid-template-columns: 1fr auto;
  }

  .page-about .about-stats-visual-note {
    width: 260px;
    border-top: none;
    border-left: 1px solid rgba(11, 27, 58, 0.14);
    display: flex;
    align-items: center;
  }
}