.page-about {
  --about-accent: var(--accent-orange);
  --about-gold: var(--gold-accent);
  --about-deep: var(--primary-deep);
  --about-mid: var(--bg-mid);
  --about-light: var(--bg-light);
  --about-white: var(--surface-white);
  --about-text: var(--text-light);
  --about-muted: var(--text-muted);
  --about-border: var(--border-dark);
  --about-radius: var(--radius-card);
  background: var(--about-light);
}

.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--focus-glow);
  outline-offset: 3px;
}

/* 01 我们是谁 */
.page-about .about-intro {
  position: relative;
  background: linear-gradient(135deg, var(--about-deep) 0%, var(--about-mid) 100%);
  color: var(--about-text);
  padding: 48px 0 72px;
  overflow: hidden;
}

.page-about .about-intro::before {
  content: '';
  position: absolute;
  width: 420px;
  height: 420px;
  right: -140px;
  top: -120px;
  border: 2px solid rgba(255, 107, 53, 0.45);
  transform: rotate(16deg);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-intro::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 200px;
  background:
    linear-gradient(135deg, transparent 50%, rgba(212, 175, 55, 0.1) 50%),
    linear-gradient(45deg, transparent 42%, rgba(255, 107, 53, 0.07) 42%, rgba(255, 107, 53, 0.07) 48%, transparent 48%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-intro .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: 40px;
  font-size: 0.875rem;
  color: var(--about-muted);
}

.page-about .breadcrumbs a {
  color: var(--about-text);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

.page-about .breadcrumbs a:hover {
  color: var(--about-accent);
}

.page-about .about-intro-grid {
  display: grid;
  gap: 36px;
}

.page-about .about-intro-content .section-kicker {
  color: var(--about-accent);
  margin-bottom: 16px;
}

.page-about .about-intro h1 {
  font-family: var(--font-headline);
  font-size: 2.5rem;
  line-height: 1.15;
  color: var(--about-text);
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}

.page-about .about-intro-lead {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--about-text);
  margin-bottom: 16px;
  max-width: 560px;
}

.page-about .about-intro-sub {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--about-muted);
  margin-bottom: 32px;
  max-width: 540px;
}

.page-about .about-intro-media {
  position: relative;
  border-radius: var(--about-radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  aspect-ratio: 16 / 10;
  background: var(--about-mid);
}

.page-about .about-intro-media::after {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: calc(var(--about-radius) - 6px);
  pointer-events: none;
}

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

/* 02 使命与愿景 */
.page-about .about-mission {
  background: var(--about-light);
  padding: 80px 0;
}

.page-about .about-mission-inner {
  max-width: 980px;
}

.page-about .about-mission .section-kicker {
  color: var(--about-gold);
  margin-bottom: 16px;
}

.page-about .about-mission h2 {
  font-family: var(--font-headline);
  font-size: 2.25rem;
  line-height: 1.2;
  color: var(--about-deep);
  margin-bottom: 20px;
}

.page-about .about-mission-text {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--about-deep);
  margin-bottom: 40px;
  max-width: 720px;
}

.page-about .about-mission-cards {
  margin-top: 8px;
}

.page-about .about-mission-cards .card {
  background: var(--about-white);
  border: 1px solid var(--about-border);
  border-radius: var(--about-radius);
  padding: 28px;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-mission-cards .card:hover {
  border-color: var(--about-accent);
  box-shadow: var(--shadow-soft);
  transform: translateY(-4px);
}

.page-about .about-mission-cards h3 {
  color: var(--about-deep);
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.page-about .about-mission-cards p {
  color: var(--about-deep);
  opacity: 0.78;
  line-height: 1.7;
  margin: 0;
}

.page-about .about-mission-more {
  margin-top: 40px;
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--about-deep);
  padding-left: 20px;
  border-left: 4px solid var(--about-gold);
  max-width: 640px;
}

/* 03 发展里程碑 */
.page-about .about-milestones {
  position: relative;
  background: var(--about-mid);
  color: var(--about-text);
  padding: 80px 0;
  overflow: hidden;
}

.page-about .about-milestones::before {
  content: '';
  position: absolute;
  width: 560px;
  height: 560px;
  left: -220px;
  top: 120px;
  border: 2px solid rgba(212, 175, 55, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-milestones::after {
  content: '';
  position: absolute;
  width: 320px;
  height: 320px;
  right: -120px;
  bottom: 60px;
  border: 2px solid rgba(255, 107, 53, 0.2);
  transform: rotate(24deg);
  pointer-events: none;
}

.page-about .about-milestones .section-head {
  position: relative;
  z-index: 1;
  margin-bottom: 48px;
}

.page-about .about-milestones .section-kicker {
  color: var(--about-gold);
}

.page-about .about-milestones h2 {
  font-family: var(--font-headline);
  font-size: 2rem;
  line-height: 1.2;
  color: var(--about-text);
  margin-bottom: 0;
}

.page-about .milestone-list {
  position: relative;
  z-index: 1;
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: 900px;
}

.page-about .milestone-list::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--about-gold), rgba(212, 175, 55, 0.2));
}

.page-about .milestone-item {
  position: relative;
  padding-left: 56px;
  margin-bottom: 48px;
}

.page-about .milestone-item:last-child {
  margin-bottom: 0;
}

.page-about .milestone-marker {
  position: absolute;
  left: 5px;
  top: 8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--about-mid);
  border: 3px solid var(--about-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.18);
}

.page-about .milestone-panel {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-border);
  border-radius: var(--about-radius);
  padding: 24px;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .milestone-panel:hover {
  border-color: var(--about-gold);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-4px);
}

.page-about .milestone-badge {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--about-gold);
  background: rgba(212, 175, 55, 0.12);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 12px;
}

.page-about .milestone-panel h3 {
  color: var(--about-text);
  margin-bottom: 8px;
  font-size: 1.125rem;
}

.page-about .milestone-panel p {
  color: var(--about-muted);
  line-height: 1.7;
  margin: 0;
}

/* 04 平台数据 */
.page-about .about-stats {
  background: var(--about-white);
  padding: 80px 0;
}

.page-about .about-stats-grid {
  display: grid;
  gap: 40px;
}

.page-about .about-stats-main .section-kicker {
  color: var(--about-accent);
}

.page-about .about-stats-main h2 {
  font-family: var(--font-headline);
  font-size: 2rem;
  line-height: 1.2;
  color: var(--about-deep);
  margin-bottom: 32px;
}

.page-about .stats-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.page-about .stat-item {
  padding: 24px;
  border-left: 4px solid var(--about-accent);
  background: var(--about-light);
  border-radius: var(--radius-small);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-headline);
  font-size: 2.5rem;
  color: var(--about-deep);
  line-height: 1.1;
}

.page-about .stat-unit {
  font-size: 1.25rem;
  color: var(--about-accent);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  color: var(--about-deep);
  font-size: 0.875rem;
  opacity: 0.78;
}

.page-about .about-stats-note {
  margin-top: 24px;
  color: var(--about-deep);
  opacity: 0.82;
  line-height: 1.8;
  max-width: 620px;
}

.page-about .about-stats-media {
  border-radius: var(--about-radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--about-mid);
  box-shadow: var(--shadow-soft);
}

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

/* 05 服务承诺 */
.page-about .about-promise {
  position: relative;
  background: linear-gradient(180deg, var(--about-deep) 0%, var(--about-mid) 100%);
  color: var(--about-text);
  padding: 80px 0;
  overflow: hidden;
}

.page-about .about-promise::before {
  content: '';
  position: absolute;
  width: 320px;
  height: 320px;
  top: 60px;
  right: -140px;
  border: 2px solid rgba(255, 107, 53, 0.22);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-promise .section-head {
  position: relative;
  z-index: 1;
  margin-bottom: 40px;
}

.page-about .about-promise .section-kicker {
  color: var(--about-accent);
}

.page-about .about-promise h2 {
  font-family: var(--font-headline);
  font-size: 2rem;
  line-height: 1.2;
  color: var(--about-text);
  margin-bottom: 0;
}

.page-about .promise-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 20px;
  margin-bottom: 32px;
}

.page-about .promise-card {
  position: relative;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--about-border);
  border-radius: var(--about-radius);
  padding: 28px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .promise-card::before {
  content: attr(data-num);
  position: absolute;
  top: 14px;
  right: 18px;
  font-family: var(--font-headline);
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.07);
  line-height: 1;
  pointer-events: none;
}

.page-about .promise-card:hover {
  border-color: var(--about-accent);
  transform: translateY(-4px);
}

.page-about .promise-card h3 {
  color: var(--about-text);
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.page-about .promise-card p {
  color: var(--about-muted);
  margin: 0;
  line-height: 1.7;
}

.page-about .promise-media {
  border-radius: var(--about-radius);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--about-mid);
  box-shadow: var(--shadow-lift);
  margin-bottom: 32px;
}

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

.page-about .about-promise-extra {
  position: relative;
  z-index: 1;
  color: var(--about-muted);
  line-height: 1.8;
  max-width: 760px;
  margin-bottom: 28px;
}

.page-about .about-promise-links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-promise-links .btn-ghost {
  color: var(--about-text);
  border-color: var(--about-border);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-promise-links .btn-ghost:hover {
  color: var(--about-accent);
  border-color: var(--about-accent);
}

@media (min-width: 768px) {
  .page-about .about-intro {
    padding: 120px 0 96px;
  }

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 56px;
  }

  .page-about .about-intro h1 {
    font-size: 3.5rem;
  }

  .page-about .about-mission,
  .page-about .about-milestones,
  .page-about .about-stats,
  .page-about .about-promise {
    padding: 120px 0;
  }

  .page-about .about-milestones h2,
  .page-about .about-stats-main h2,
  .page-about .about-promise h2 {
    font-size: 2.5rem;
  }

  .page-about .milestone-list::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .milestone-item {
    width: 50%;
    padding-left: 0;
    padding-right: 48px;
    margin-left: 0;
  }

  .page-about .milestone-marker {
    left: auto;
    right: -9px;
  }

  .page-about .milestone-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 48px;
    padding-right: 0;
  }

  .page-about .milestone-item:nth-child(even) .milestone-marker {
    left: -9px;
    right: auto;
  }

  .page-about .about-stats-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
    gap: 64px;
  }

  .page-about .stat-num {
    font-size: 3.25rem;
  }

  .page-about .promise-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-about .promise-media {
    aspect-ratio: 21 / 9;
  }
}

@media (min-width: 1100px) {
  .page-about .promise-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-stats-media {
    aspect-ratio: 4 / 3;
  }
}