.page-about {
  --about-left-bg: #1A1A2E;
  --about-right-bg: #F5F5F5;
  --about-gold: #FFD700;
  --about-primary: #003399;
  --about-secondary: #8B0000;
  --about-text-light: #FFFFFF;
  --about-text-muted: #CCCCCC;
  --about-text-dark: #1A1A2E;
  --about-timeline-line: rgba(255, 215, 0, 0.3);
  --about-card-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --about-card-hover-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
  --about-transition: 0.35s ease;

  max-width: 100%;
  overflow-x: hidden;
  background: var(--about-right-bg);
}

/* ====== 品牌英雄区：左右分屏 ====== */
.about-hero {
  display: flex;
  flex-direction: column;
  min-height: 70vh;
  position: relative;
}

.about-hero-left {
  background: var(--about-left-bg);
  padding: 48px 24px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  z-index: 2;
}

.about-logo-symbol {
  width: 80px;
  height: 80px;
  object-fit: contain;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 12px rgba(255, 215, 0, 0.3));
}

.about-hero-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--about-gold);
  margin: 0 0 8px;
  line-height: 1.1;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.about-hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.1rem;
  color: var(--about-text-light);
  letter-spacing: 6px;
  margin: 0 0 12px;
  opacity: 0.9;
  position: relative;
  padding-bottom: 12px;
}

.about-hero-subtitle::after {
  content: '';
  display: block;
  width: 60px;
  height: 2px;
  background: var(--about-gold);
  margin: 12px auto 0;
}

.about-hero-year {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--about-gold);
  opacity: 0.25;
  letter-spacing: 8px;
  line-height: 1;
  margin-top: 8px;
}

.about-hero-right {
  position: relative;
  overflow: hidden;
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.about-hero-texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.about-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 51, 153, 0.85) 0%, rgba(26, 26, 46, 0.7) 100%);
  z-index: 1;
}

.about-hero-quote {
  position: relative;
  z-index: 2;
  padding: 40px 24px 48px;
  margin: 0;
  color: var(--about-text-light);
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.7;
  max-width: 520px;
  text-align: center;
  font-style: italic;
  border-left: 3px solid var(--about-gold);
  border-right: 3px solid var(--about-gold);
}

.about-hero-quote p {
  margin: 0;
}

/* ====== 品牌故事区 ====== */
.about-story {
  padding: 56px 0 48px;
  background: var(--about-text-light);
}

.about-section-label {
  font-size: 0.85rem;
  letter-spacing: 4px;
  color: var(--about-primary);
  margin: 0 0 32px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--about-gold);
  display: inline-block;
}

.about-story-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-story-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  background: var(--about-right-bg);
  border: var(--border-thin);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--about-transition), transform var(--about-transition);
}

.about-story-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.about-story-number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--about-gold);
  line-height: 1;
  min-width: 44px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.about-story-text {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--about-text-dark);
  line-height: 1.7;
  margin: 0;
}

/* ====== 里程碑时间轴 ====== */
.about-milestones {
  padding: 48px 0 56px;
  background: var(--about-left-bg);
  position: relative;
}

.about-milestones .about-section-label {
  color: var(--about-gold);
  border-bottom-color: var(--about-gold);
}

.about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: 40px;
}

.about-timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--about-timeline-line);
}

.about-timeline-item {
  position: relative;
  padding: 20px 0;
  cursor: default;
}

.about-timeline-year {
  position: absolute;
  left: -40px;
  top: 24px;
  width: 72px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--about-gold);
  text-align: right;
  padding-right: 16px;
  line-height: 1.4;
  letter-spacing: 1px;
}

.about-timeline-year::after {
  content: '';
  position: absolute;
  right: 4px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-gold);
  border: 2px solid var(--about-left-bg);
  box-shadow: 0 0 0 2px var(--about-gold);
}

.about-timeline-card {
  background: rgba(255, 255, 255, 0.06);
  padding: 20px 24px;
  border: 1px solid rgba(255, 215, 0, 0.15);
  border-radius: 0;
  transition: background var(--about-transition), border-color var(--about-transition), box-shadow var(--about-transition);
}

.about-timeline-item:hover .about-timeline-card {
  background: rgba(255, 255, 255, 0.10);
  border-color: rgba(255, 215, 0, 0.35);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.about-timeline-card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--about-gold);
  margin: 0 0 8px;
  letter-spacing: 1px;
}

.about-timeline-card-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--about-text-muted);
  line-height: 1.7;
  margin: 0 0 16px;
}

.about-timeline-link {
  display: inline-block;
}

/* ====== 客户服务承诺 ====== */
.about-service {
  padding: 56px 0 64px;
  background: var(--about-text-light);
}

.about-service .about-section-label {
  color: var(--about-primary);
  border-bottom-color: var(--about-primary);
}

.about-service-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-service-card {
  background: var(--about-right-bg);
  padding: 32px 24px;
  border: var(--border-thin);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: box-shadow var(--about-transition), transform var(--about-transition);
  position: relative;
}

.about-service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.about-service-icon {
  width: 64px;
  height: 64px;
  object-fit: contain;
  margin: 0 auto 16px;
  display: block;
  filter: drop-shadow(0 2px 8px rgba(0, 51, 153, 0.2));
}

.about-service-card-accent {
  width: 48px;
  height: 3px;
  background: var(--about-secondary);
  margin: 0 auto 16px;
}

.about-service-card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--about-primary);
  margin: 0 0 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.about-service-card-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--about-text-dark);
  line-height: 1.7;
  margin: 0 0 20px;
}

.about-service-link {
  display: inline-block;
  margin-top: 4px;
}

/* ====== 面包屑导航 ====== */
.about-breadcrumb {
  background: var(--about-left-bg);
  padding: 16px 24px;
  border-top: 1px solid rgba(255, 215, 0, 0.2);
}

.about-breadcrumb .breadcrumb {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--about-text-muted);
}

.about-breadcrumb .breadcrumb li {
  display: flex;
  align-items: center;
}

.about-breadcrumb .breadcrumb li + li::before {
  content: '/';
  margin-right: 12px;
  color: var(--about-gold);
  opacity: 0.5;
}

.about-breadcrumb .breadcrumb a {
  color: var(--about-gold);
  text-decoration: none;
  transition: opacity var(--about-transition);
}

.about-breadcrumb .breadcrumb a:hover {
  opacity: 0.7;
}

.about-breadcrumb .breadcrumb span[aria-current="page"] {
  color: var(--about-text-light);
  opacity: 0.8;
}

/* ====== 按钮变体 ====== */
.page-about .btn-outline {
  border: 1px solid var(--about-gold);
  color: var(--about-gold);
  background: transparent;
  padding: 8px 20px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-decoration: none;
  transition: background var(--about-transition), color var(--about-transition);
}

.page-about .btn-outline:hover {
  background: var(--about-gold);
  color: var(--about-left-bg);
}

.page-about .btn-primary {
  border: 1px solid var(--about-primary);
  background: var(--about-primary);
  color: var(--about-text-light);
  padding: 10px 24px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-decoration: none;
  transition: background var(--about-transition), border-color var(--about-transition);
}

.page-about .btn-primary:hover {
  background: #002266;
  border-color: var(--about-gold);
}

/* ====== 响应式：桌面端 ====== */
@media (min-width: 768px) {
  .about-hero {
    flex-direction: row;
    min-height: 80vh;
  }

  .about-hero-left {
    flex: 0 0 42%;
    padding: 80px 48px 60px;
    align-items: flex-start;
    text-align: left;
    justify-content: center;
  }

  .about-logo-symbol {
    width: 120px;
    height: 120px;
    margin-bottom: 24px;
  }

  .about-hero-title {
    font-size: 3.6rem;
    letter-spacing: 8px;
  }

  .about-hero-subtitle {
    font-size: 1.3rem;
    text-align: left;
  }

  .about-hero-subtitle::after {
    margin: 12px 0 0;
  }

  .about-hero-year {
    font-size: 5rem;
    margin-top: 16px;
    align-self: flex-start;
  }

  .about-hero-right {
    flex: 1;
    min-height: auto;
    align-items: center;
    justify-content: center;
  }

  .about-hero-quote {
    padding: 48px 40px 56px;
    font-size: 1.3rem;
    max-width: 600px;
    border-left-width: 4px;
    border-right-width: 4px;
  }

  .about-story-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
  }

  .about-story-card {
    flex-direction: column;
    padding: 32px 28px;
  }

  .about-story-card:hover {
    transform: translateY(-4px);
  }

  .about-story-number {
    font-size: 2rem;
    min-width: auto;
  }

  .about-timeline {
    padding-left: 120px;
  }

  .about-timeline::before {
    left: 60px;
  }

  .about-timeline-year {
    left: -120px;
    width: 100px;
    font-size: 1rem;
    top: 28px;
  }

  .about-timeline-card {
    padding: 28px 32px;
  }

  .about-timeline-card-title {
    font-size: 1.25rem;
  }

  .about-timeline-card-text {
    font-size: 1rem;
  }

  .about-service-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
  }

  .about-service-card {
    padding: 40px 28px;
  }

  .about-service-icon {
    width: 80px;
    height: 80px;
  }

  .about-breadcrumb {
    padding: 16px 48px;
  }
}

@media (min-width: 1024px) {
  .about-hero-left {
    flex-basis: 38%;
    padding: 100px 64px 80px;
  }

  .about-hero-title {
    font-size: 4.2rem;
  }

  .about-hero-year {
    font-size: 6rem;
  }

  .about-hero-quote {
    font-size: 1.5rem;
    max-width: 680px;
  }

  .about-story {
    padding: 72px 0 64px;
  }

  .about-milestones {
    padding: 64px 0 72px;
  }

  .about-service {
    padding: 72px 0 80px;
  }
}

/* ====== 滚动衰减 & 可访问性 ====== */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .about-story-card:hover {
    transform: none;
  }

  .about-service-card:hover {
    transform: none;
  }

  .about-timeline-item:hover .about-timeline-card {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 215, 0, 0.15);
    box-shadow: none;
  }
}