.page-about {
  --page-about-card-hover: #1a3154;
  background: var(--c-primary-blue);
  color: var(--c-text-primary);
}

.page-about__container {
  width: min(1200px, 100% - 40px);
  margin-inline: auto;
}

/* ===== Hero 首屏 ===== */
.page-about__hero {
  background: var(--c-primary-blue);
  color: var(--c-text-primary);
  position: relative;
  overflow: hidden;
  padding: 32px 0 40px;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -80px;
  width: 260px;
  height: 260px;
  background: var(--c-accent-orange);
  opacity: 0.16;
  transform: rotate(16deg);
  border-radius: 40px 40px 0 40px;
  pointer-events: none;
}

.page-about__hero::after {
  content: '';
  position: absolute;
  left: -50px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 1px solid var(--c-border);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
}

.page-about__crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--c-text-secondary);
  margin-bottom: 28px;
}

.page-about__crumbs-link {
  color: var(--c-text-secondary);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

.page-about__crumbs-link:hover,
.page-about__crumbs-link:focus {
  color: var(--c-accent-orange);
}

.page-about__crumbs-sep {
  color: var(--c-border);
}

.page-about__crumbs-current {
  color: var(--c-text-primary);
}

.page-about__hero-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent-orange);
  margin: 0 0 18px;
}

.page-about__kicker-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-accent-green);
  box-shadow: 0 0 10px var(--c-accent-green);
}

.page-about__hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 6vw, 64px);
  line-height: 0.98;
  margin: 0 0 18px;
  letter-spacing: 0.01em;
  max-width: 10ch;
}

.page-about__hero-lead {
  font-size: 18px;
  font-weight: 600;
  color: var(--c-text-primary);
  margin: 0 0 12px;
}

.page-about__hero-desc {
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text-secondary);
  max-width: 54ch;
  margin: 0 0 22px;
}

.page-about__hero-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about__hero-tags li {
  border: 1px solid var(--c-border);
  background: var(--c-secondary-blue);
  color: var(--c-text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
}

.page-about__hero-media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-secondary-blue);
  border: 1px solid var(--c-border);
  transform: rotate(-1deg);
}

.page-about__hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ===== 通用章节头 ===== */
.page-about__section-head {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 40px;
}

.page-about__section-num {
  font-family: var(--font-mono);
  font-size: 56px;
  line-height: 0.9;
  color: var(--c-accent-orange);
  letter-spacing: -0.03em;
  flex: 0 0 auto;
}

.page-about__section-heading h2 {
  font-family: var(--font-display);
  font-size: 32px;
  letter-spacing: 0.02em;
  margin: 0 0 6px;
  color: inherit;
}

.page-about__section-sub {
  margin: 0;
  font-size: 15px;
  color: inherit;
  opacity: 0.72;
}

.page-about__section-head--light {
  color: var(--c-text-primary);
}

.page-about__section-head--light .page-about__section-sub {
  color: var(--c-text-secondary);
  opacity: 1;
}

.page-about__section-head--dark {
  color: var(--c-primary-blue);
}

.page-about__section-head--dark .page-about__section-sub {
  color: rgba(10, 25, 47, 0.7);
  opacity: 1;
}

/* ===== 故事起点 ===== */
.page-about__story {
  background: var(--c-warm-gray);
  color: var(--c-primary-blue);
  padding: 64px 0;
}

.page-about__story-body {
  display: grid;
  gap: 32px;
}

.page-about__story-copy p {
  color: var(--c-primary-blue);
  font-size: 16px;
  line-height: 1.75;
  max-width: 64ch;
  margin: 0 0 16px;
}

.page-about__story-copy p:last-child {
  margin-bottom: 0;
}

.page-about__story-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about__story-points li {
  background: #ffffff;
  border: 1px solid rgba(10, 25, 47, 0.12);
  border-radius: var(--radius-md);
  padding: 24px;
}

.page-about__story-point-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent-orange);
  display: inline-block;
  margin-bottom: 8px;
}

.page-about__story-points h3 {
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--c-primary-blue);
}

.page-about__story-points p {
  margin: 0;
  font-size: 14px;
  color: rgba(10, 25, 47, 0.72);
  line-height: 1.6;
}

/* ===== 发展里程碑 ===== */
.page-about__milestones {
  background: linear-gradient(180deg, var(--c-primary-blue), var(--c-secondary-blue));
  color: var(--c-text-primary);
  padding: 72px 0;
}

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

.page-about__timeline {
  position: relative;
  padding-left: 40px;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-accent-orange), var(--c-border) 72%);
  border-radius: var(--radius-pill);
}

.page-about__timeline-item {
  position: relative;
  margin-bottom: 22px;
}

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

.page-about__timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 12px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-primary-blue);
  border: 3px solid var(--c-accent-orange);
  box-shadow: 0 0 0 2px var(--c-accent-orange), 0 0 14px rgba(255, 107, 53, 0.55);
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}

.page-about__timeline-item:last-child::before {
  background: var(--c-accent-green);
  border-color: var(--c-accent-green);
  box-shadow: 0 0 0 2px var(--c-accent-green), 0 0 14px rgba(57, 255, 20, 0.55);
}

.page-about__timeline-item:hover::before {
  transform: scale(1.3);
}

.page-about__timeline-meta {
  margin-bottom: 8px;
}

.page-about__timeline-version {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent-orange);
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.4);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.page-about__timeline-card {
  background: var(--c-secondary-blue);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out), background var(--dur-med) var(--ease-out);
}

.page-about__timeline-item:hover .page-about__timeline-card {
  border-color: var(--c-accent-orange);
  background: var(--page-about-card-hover);
  transform: translateX(4px);
}

.page-about__timeline-card h3 {
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--c-text-primary);
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.65;
}

.page-about__milestones-aside {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about__milestone-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  background: var(--c-primary-blue);
}

.page-about__milestone-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about__milestone-figure figcaption {
  font-size: 13px;
  color: var(--c-text-secondary);
  padding: 12px 16px;
}

.page-about__milestone-quote {
  margin: 0;
  padding: 18px 20px;
  border-left: 3px solid var(--c-accent-green);
  background: rgba(57, 255, 20, 0.08);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 15px;
  color: var(--c-text-primary);
}

.page-about__milestone-quote p {
  margin: 0;
}

/* ===== 服务能力 ===== */
.page-about__capability {
  background: var(--c-warm-gray);
  color: var(--c-primary-blue);
  padding: 72px 0;
}

.page-about__stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about__stat {
  background: #ffffff;
  border: 1px solid rgba(10, 25, 47, 0.1);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-about__stat::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--c-accent-orange);
}

.page-about__stat-value {
  font-family: var(--font-display);
  font-size: 44px;
  line-height: 1;
  color: var(--c-accent-orange);
  display: block;
  letter-spacing: 0.01em;
}

.page-about__stat-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(10, 25, 47, 0.72);
  display: block;
  margin-top: 10px;
}

.page-about__capability-grid {
  display: grid;
  gap: 18px;
}

.page-about__capability-card {
  background: #ffffff;
  border: 1px solid rgba(10, 25, 47, 0.1);
  border-radius: var(--radius-md);
  padding: 24px;
  border-top: 4px solid var(--c-primary-blue);
  transition: transform var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out);
}

.page-about__capability-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 25, 47, 0.12);
}

.page-about__capability-card h3 {
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--c-primary-blue);
}

.page-about__capability-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(10, 25, 47, 0.78);
}

.page-about__capability-media {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(10, 25, 47, 0.1);
}

.page-about__capability-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ===== 资质与荣誉 ===== */
.page-about__honors {
  background: var(--c-primary-blue);
  color: var(--c-text-primary);
  padding: 72px 0;
  position: relative;
  overflow: hidden;
}

.page-about__honors-grid {
  display: grid;
  gap: 18px;
}

.page-about__honor-card {
  background: rgba(17, 34, 64, 0.7);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}

.page-about__honor-card:hover {
  border-color: var(--c-accent-orange);
  transform: translateY(-2px);
}

.page-about__honor-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-accent-orange);
  border: 1px solid rgba(255, 107, 53, 0.4);
  background: rgba(255, 107, 53, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.page-about__honor-tag--green {
  color: var(--c-accent-green);
  border-color: rgba(57, 255, 20, 0.4);
  background: rgba(57, 255, 20, 0.08);
}

.page-about__honor-card h3 {
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--c-text-primary);
}

.page-about__honor-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-secondary);
}

/* ===== 我们的承诺 ===== */
.page-about__promise {
  background: var(--c-warm-gray);
  color: var(--c-primary-blue);
  padding: 72px 0;
}

.page-about__promise-card {
  background: var(--c-primary-blue);
  color: var(--c-text-primary);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
}

.page-about__promise-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--c-accent-orange), var(--c-accent-green));
  pointer-events: none;
}

.page-about__promise-top {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.page-about__promise-num {
  font-family: var(--font-mono);
  font-size: 48px;
  color: var(--c-accent-orange);
  flex: 0 0 auto;
}

.page-about__promise-heading h2 {
  font-family: var(--font-display);
  font-size: 32px;
  margin: 0 0 6px;
  color: var(--c-text-primary);
}

.page-about__promise-sub {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-accent-green);
  margin: 0;
}

.page-about__promise-lead {
  margin: 28px 0 12px;
  font-size: 22px;
  font-weight: 700;
  color: var(--c-text-primary);
}

.page-about__promise-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text-secondary);
  max-width: 72ch;
  margin: 0 0 30px;
}

.page-about__promise-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about__promise-card .btn-primary {
  background: var(--c-accent-orange);
  border-color: var(--c-accent-orange);
  color: var(--c-text-primary);
}

.page-about__promise-card .btn-ghost {
  border-color: var(--c-border);
  color: var(--c-text-primary);
}

.page-about__promise-card .btn-ghost:hover {
  border-color: var(--c-accent-orange);
  color: var(--c-accent-orange);
}

/* ===== 桌面端布局 ===== */
@media (min-width: 900px) {
  .page-about__hero {
    padding: 48px 0 64px;
  }

  .page-about__hero-grid {
    grid-template-columns: 7fr 5fr;
    gap: 56px;
  }

  .page-about__hero-copy {
    order: 1;
  }

  .page-about__hero-media {
    order: 2;
  }

  .page-about__story-body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }

  .page-about__milestones-grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 44px;
  }

  .page-about__stat {
    padding: 28px 20px;
  }

  .page-about__stat-value {
    font-size: 56px;
  }

  .page-about__capability-grid {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }

  .page-about__honors-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }

  .page-about__promise-card {
    padding: 48px 56px;
  }

  .page-about__promise-lead {
    font-size: 26px;
  }

  .page-about__promise-cta {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}