.page-about {
  --about-card-bg: rgba(16, 35, 63, 0.78);
  --about-grid-line: rgba(46, 255, 138, 0.05);
  --about-year-col: 140px;
  --about-mid-col: 48px;
  position: relative;
  overflow: hidden;
  background: var(--color-deep-blue);
  color: var(--color-ivory);
}

.page-about .about-shell {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

@media (min-width: 768px) {
  .page-about .about-shell {
    padding-inline: var(--space-xl);
  }
}

/* 面包屑 */
.page-about .breadcrumb-nav {
  border-bottom: 1px solid var(--color-line-soft);
  padding-block: var(--space-sm);
}

.page-about .breadcrumb-nav a {
  color: var(--color-stone-gray);
  text-decoration: none;
  transition: color var(--transition-fast) ease;
}

.page-about .breadcrumb-nav a:hover {
  color: var(--color-neon-green);
}

.page-about .breadcrumb-nav .breadcrumb-sep {
  margin-inline: var(--space-xs);
  color: var(--color-stone-gray);
}

/* Hero 区 */
.page-about .about-hero {
  position: relative;
  padding-block: var(--space-xl);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -12%;
  top: -8%;
  width: 720px;
  height: 720px;
  background: radial-gradient(circle, rgba(46, 255, 138, 0.08), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 992px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }
}

.page-about .about-kicker {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-data);
  font-size: var(--font-size-1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-neon-green);
}

.page-about .about-hero h1 {
  margin: 0 0 var(--space-md);
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.6vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
}

.page-about .about-h1-sub {
  display: block;
  margin-top: var(--space-xs);
  font-size: 0.72em;
  color: var(--color-stone-gray);
}

.page-about .about-lead {
  max-width: 58ch;
  margin: 0;
  font-size: var(--font-size-3);
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.88);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.page-about .about-hero-actions .btn-primary,
.page-about .team-actions .btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--color-neon-green);
  color: var(--color-deep-blue);
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--transition-fast) ease, background var(--transition-fast) ease;
}

.page-about .about-hero-actions .btn-primary:hover,
.page-about .team-actions .btn-primary:hover {
  transform: translateY(-2px);
  background: #5CFFA6;
}

.page-about .about-hero-actions .btn-ghost,
.page-about .team-actions .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
  color: var(--color-ivory);
  text-decoration: none;
  transition: border-color var(--transition-fast) ease, color var(--transition-fast) ease;
}

.page-about .about-hero-actions .btn-ghost:hover,
.page-about .team-actions .btn-ghost:hover {
  border-color: var(--color-neon-green);
  color: var(--color-neon-green);
}

.page-about .about-hero-media img,
.page-about .cert-visual img,
.page-about .team-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-md);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.32);
}

/* 数据指标带 */
.page-about .about-stats {
  border-block: 1px solid var(--color-line);
  background: rgba(16, 24, 32, 0.5);
  padding-block: var(--space-lg);
  margin-block: var(--space-lg);
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .page-about .about-stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .about-stats .metric-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stats .metric-value {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  font-weight: 700;
  color: var(--color-neon-green);
}

.page-about .about-stats .metric-label {
  font-size: var(--font-size-2);
  color: var(--color-stone-gray);
}

/* 通用章节 */
.page-about .about-section {
  padding-block: var(--space-xl);
}

@media (min-width: 768px) {
  .page-about .about-section {
    padding-block: var(--space-2xl);
  }
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.page-about .about-section-head .section-index {
  font-family: var(--font-data);
  font-size: var(--font-size-6);
  line-height: 1;
  color: var(--color-neon-green);
  min-width: 0.9em;
}

.page-about .about-section-head h2 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: var(--font-size-5);
}

.page-about .section-subtitle {
  margin: 0;
  font-size: var(--font-size-2);
  color: var(--color-stone-gray);
}

/* 01 创立初衷 */
.page-about .about-origin-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 920px) {
  .page-about .about-origin-grid {
    grid-template-columns: 1.55fr 0.9fr;
    align-items: start;
  }
}

.page-about .about-origin-copy p {
  margin: 0 0 var(--space-md);
  font-size: var(--font-size-3);
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.85);
}

.page-about .about-origin-aside {
  position: relative;
  padding: var(--space-lg);
  background: var(--about-card-bg);
  border-left: 4px solid var(--color-neon-green);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .origin-note-label {
  font-family: var(--font-data);
  font-size: var(--font-size-1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-orange-red);
}

.page-about .origin-note {
  margin: var(--space-xs) 0 0;
  font-weight: 700;
  font-size: var(--font-size-4);
  line-height: 1.45;
}

.page-about .about-origin-aside .caption-note {
  margin: var(--space-md) 0 0;
}

/* 02 发展里程碑 */
.page-about .about-journey {
  position: relative;
}

.page-about .about-journey::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .milestone-list {
  position: relative;
  display: grid;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .milestone-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: -24px;
  left: 21px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-neon-green), var(--color-moss-green) 55%, rgba(46, 255, 138, 0.12));
}

.page-about .milestone-item {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  column-gap: var(--space-sm);
}

.page-about .milestone-marker {
  grid-column: 1;
  grid-row: 2;
  width: 16px;
  height: 16px;
  margin-top: 18px;
  justify-self: end;
  border-radius: 50%;
  background: var(--color-neon-green);
  box-shadow: 0 0 0 6px rgba(46, 255, 138, 0.14);
  z-index: 1;
}

.page-about .milestone-year {
  grid-column: 1 / -1;
  grid-row: 1;
  font-family: var(--font-data);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-neon-green);
}

.page-about .milestone-card {
  grid-column: 2;
  grid-row: 2;
  padding: var(--space-md);
  background: linear-gradient(135deg, rgba(18, 42, 72, 0.85), rgba(10, 26, 47, 0.6));
  border: 1px solid var(--color-line-soft);
  border-left: 3px solid var(--color-neon-green);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-base) ease;
}

.page-about .milestone-card:hover {
  transform: translateX(4px);
}

.page-about .milestone-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: var(--font-size-4);
}

.page-about .milestone-card p {
  margin: 0;
  font-size: var(--font-size-2);
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.78);
}

.page-about .milestone-note {
  position: relative;
  margin-top: var(--space-lg);
}

@media (min-width: 992px) {
  .page-about .milestone-list::before {
    left: calc(var(--about-year-col) + var(--space-md) + (var(--about-mid-col) / 2));
  }

  .page-about .milestone-item {
    grid-template-columns: var(--about-year-col) var(--about-mid-col) 1fr;
    column-gap: var(--space-md);
  }

  .page-about .milestone-marker {
    grid-column: 2;
    grid-row: 1;
    margin-top: 6px;
    justify-self: center;
  }

  .page-about .milestone-year {
    grid-column: 1;
    grid-row: 1;
    padding-top: 2px;
    text-align: right;
    font-size: 2rem;
  }

  .page-about .milestone-card {
    grid-column: 3;
    grid-row: 1;
  }
}

/* 03 资质与认证 */
.page-about .cert-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 980px) {
  .page-about .cert-grid {
    grid-template-columns: 0.85fr 1.4fr;
    align-items: start;
  }
}

.page-about .cert-visual {
  margin: 0;
}

.page-about .cert-visual figcaption,
.page-about .team-figure figcaption {
  margin-top: var(--space-sm);
}

.page-about .cert-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.page-about .cert-filter .tag-chip {
  appearance: none;
  border: 1px solid var(--color-line);
  background: rgba(16, 24, 32, 0.6);
  color: var(--color-ivory);
  font-family: var(--font-body);
  font-size: var(--font-size-2);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition-fast) ease;
}

.page-about .cert-filter .tag-chip:hover,
.page-about .cert-filter .tag-chip.is-active {
  border-color: var(--color-neon-green);
  background: rgba(46, 255, 138, 0.12);
  color: var(--color-neon-green);
}

.page-about .cert-list {
  display: grid;
  gap: var(--space-md);
}

.page-about .cert-card {
  padding: var(--space-lg);
  background: var(--about-card-bg);
  border-top: 1px solid var(--color-line-soft);
  border-left: 4px solid var(--color-neon-green);
  border-radius: var(--radius-sm);
}

.page-about .cert-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: var(--font-size-4);
}

.page-about .cert-card p {
  margin: 0;
  font-size: var(--font-size-2);
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.78);
}

/* 04 团队与服务 */
.page-about .team-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: start;
  }
}

.page-about .team-copy > p {
  margin: 0;
  font-size: var(--font-size-3);
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.85);
}

.page-about .team-flow-list {
  display: grid;
  gap: 0;
  margin: var(--space-lg) 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-line-soft);
}

.page-about .team-flow-list li {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding-block: var(--space-sm);
  border-bottom: 1px solid var(--color-line-soft);
}

.page-about .team-flow-num {
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--color-orange-red);
}

.page-about .team-flow-list strong {
  display: block;
  margin-bottom: 2px;
  font-size: var(--font-size-3);
}

.page-about .team-flow-list span {
  font-size: var(--font-size-2);
  line-height: 1.6;
  color: rgba(245, 247, 250, 0.78);
}

.page-about .team-note {
  margin: var(--space-lg) 0;
  padding: var(--space-md);
  background: linear-gradient(135deg, rgba(91, 140, 90, 0.16), rgba(46, 255, 138, 0.06));
  border-left: 4px solid var(--color-moss-green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: var(--font-size-2);
  color: rgba(245, 247, 250, 0.88);
}

.page-about .team-note p {
  margin: 0 0 6px;
}

.page-about .team-note p:last-child {
  margin-bottom: 0;
}

.page-about .team-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.page-about .team-figure {
  margin: 0;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .milestone-card,
  .page-about .cert-card {
    transition: transform var(--transition-base) ease, border-color var(--transition-base) ease;
  }

  .page-about .milestone-card:hover,
  .page-about .cert-card:hover {
    transform: translateY(-3px);
  }
}