.page-about {
  --about-gold: #D4AF37;
  --about-gold-light: #F0D86E;
  --about-primary: #0A2A4A;
  --about-accent: #E63946;
  --about-cream: #F5F0E1;
  --about-darkbrown: #2C1E16;
  --about-white: #FFFFFF;
  --about-footer-bg: #1C3A5C;
  --about-timeline-width: 4px;
  --about-dot-size: 20px;
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  font-family: "Inter", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  color: var(--about-darkbrown);
  background-color: var(--about-cream);
}

/* 面包屑 */
.page-about__breadcrumb {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 1.25rem 1.5rem 0;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--about-gold);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-about__breadcrumb-link {
  color: var(--about-gold);
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--transition, 0.3s ease);
}
.page-about__breadcrumb-link:hover,
.page-about__breadcrumb-link:focus-visible {
  opacity: 0.7;
  outline: none;
  text-decoration: underline;
}
.page-about__breadcrumb-sep {
  color: var(--about-gold);
  opacity: 0.6;
  font-weight: 300;
}
.page-about__breadcrumb-current {
  color: var(--about-cream);
  font-weight: 400;
  opacity: 0.85;
}

/* Hero 视觉区 */
.page-about__hero {
  position: relative;
  width: 100%;
  max-width: var(--max-width, 1280px);
  margin: 0.75rem auto 0;
  overflow: hidden;
  background-color: var(--about-primary);
  min-height: 320px;
}
.page-about__hero-image {
  display: block;
  width: 100%;
  height: auto;
  min-height: 240px;
  object-fit: cover;
  object-position: center 30%;
  transition: transform 0.2s linear;
}
.page-about__hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  padding: 2rem 1.5rem 2.5rem;
  background: linear-gradient(to top, rgba(10,42,74,0.92) 0%, rgba(10,42,74,0.2) 60%, transparent 100%);
  pointer-events: none;
}
.page-about__hero-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--about-gold);
  margin: 0 0 0.4rem;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
  max-width: 90%;
}
.page-about__hero-subtitle {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--about-cream);
  margin: 0;
  max-width: 70%;
  letter-spacing: 0.03em;
  opacity: 0.9;
}

/* 品牌理念区 */
.page-about__philosophy {
  background-color: var(--about-cream);
  padding: 3rem 0;
}
.page-about__philosophy-inner {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
}
.page-about__philosophy-content {
  flex: 1 1 100%;
  order: 2;
}
.page-about__philosophy-heading {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--about-primary);
  margin: 0 0 1.25rem;
  letter-spacing: -0.01em;
  position: relative;
  padding-bottom: 0.75rem;
}
.page-about__philosophy-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--about-gold), var(--about-gold-light));
  border-radius: 2px;
}
.page-about__philosophy-text {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--about-darkbrown);
  margin: 0 0 1rem;
  max-width: 680px;
}
.page-about__philosophy-text:last-of-type {
  margin-bottom: 1.5rem;
}
.page-about__philosophy-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}
.page-about__philosophy-cta .btn {
  font-size: 0.95rem;
  padding: 0.65rem 1.75rem;
  border-radius: 0;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition, 0.3s ease);
  border: 2px solid transparent;
}
.page-about__philosophy-cta .btn-primary {
  background-color: var(--about-gold);
  color: var(--about-primary);
  border-color: var(--about-gold);
}
.page-about__philosophy-cta .btn-primary:hover,
.page-about__philosophy-cta .btn-primary:focus-visible {
  background-color: transparent;
  color: var(--about-gold);
  border-color: var(--about-gold);
}
.page-about__philosophy-cta .btn-accent {
  background-color: var(--about-accent);
  color: var(--about-white);
  border-color: var(--about-accent);
}
.page-about__philosophy-cta .btn-accent:hover,
.page-about__philosophy-cta .btn-accent:focus-visible {
  background-color: transparent;
  color: var(--about-accent);
  border-color: var(--about-accent);
}
.page-about__philosophy-visual {
  flex: 0 0 auto;
  width: 100%;
  order: 1;
}
.page-about__philosophy-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 600px;
  border: 2px solid var(--about-primary);
  box-shadow: 0 8px 32px rgba(10,42,74,0.12);
  transition: box-shadow var(--transition, 0.3s ease);
}
.page-about__philosophy-image:hover {
  box-shadow: 0 12px 40px rgba(10,42,74,0.2);
}

/* 里程碑区 */
.page-about__milestones {
  background-color: var(--about-primary);
  padding: 3.5rem 0 3rem;
  color: var(--about-cream);
}
.page-about__milestones-heading {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--about-gold);
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
  text-align: center;
}
.page-about__milestones-heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--about-gold), var(--about-gold-light));
  border-radius: 2px;
  margin: 0.75rem auto 0;
}
.page-about__milestones-intro {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--about-cream);
  opacity: 0.85;
  max-width: 580px;
  margin: 0 auto 2.5rem;
  text-align: center;
}
.page-about__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin: 0 0 2rem;
  padding: 0 0 0 2.25rem;
}
.page-about__timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 12px;
  width: var(--about-timeline-width);
  background: linear-gradient(to bottom, var(--about-gold), var(--about-gold-light), var(--about-gold));
  border-radius: 2px;
  opacity: 0.5;
}

.page-about__milestone-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0;
  cursor: default;
}
.page-about__milestone-connector {
  position: absolute;
  left: calc(-2.25rem - 2px);
  top: 1.25rem;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about__milestone-dot {
  display: block;
  width: var(--about-dot-size);
  height: var(--about-dot-size);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, var(--about-gold-light), var(--about-gold));
  border: 3px solid var(--about-cream);
  box-shadow: 0 0 0 4px var(--about-primary), 0 0 0 6px var(--about-gold);
  flex-shrink: 0;
  transition: transform var(--transition, 0.3s ease), box-shadow var(--transition, 0.3s ease);
}
.page-about__milestone-card:hover .page-about__milestone-dot,
.page-about__milestone-card:focus-within .page-about__milestone-dot {
  transform: scale(1.15);
  box-shadow: 0 0 0 4px var(--about-primary), 0 0 0 8px var(--about-gold-light);
}
.page-about__milestone-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: rgba(255,255,255,0.06);
  border: 1px solid rgba(212,175,55,0.2);
  padding: 1.25rem 1.25rem 1.25rem;
  transition: border-color var(--transition, 0.3s ease), background-color var(--transition, 0.3s ease);
}
.page-about__milestone-card:hover .page-about__milestone-body,
.page-about__milestone-card:focus-within .page-about__milestone-body {
  border-color: var(--about-gold);
  background-color: rgba(212,175,55,0.08);
}
.page-about__milestone-icon {
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  overflow: hidden;
  border: 2px solid var(--about-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--about-primary);
}
.page-about__milestone-icon img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about__milestone-text {
  flex: 1;
  min-width: 0;
}
.page-about__milestone-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--about-gold);
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.page-about__milestone-summary {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--about-cream);
  opacity: 0.9;
  margin: 0 0 0.75rem;
}
.page-about__milestone-detail {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-cream);
  opacity: 0.8;
  border-top: 1px solid rgba(212,175,55,0.15);
  padding-top: 0.75rem;
  margin-top: 0.5rem;
}
.page-about__milestone-detail p {
  margin: 0;
}
.page-about__milestones-footer {
  text-align: center;
  margin-top: 1.5rem;
}
.page-about__milestones-footer .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 2rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  background-color: var(--about-gold);
  color: var(--about-primary);
  border: 2px solid var(--about-gold);
  transition: all var(--transition, 0.3s ease);
}
.page-about__milestones-footer .btn:hover,
.page-about__milestones-footer .btn:focus-visible {
  background-color: transparent;
  color: var(--about-gold);
}

/* 未来方向区 */
.page-about__future {
  background: linear-gradient(135deg, var(--about-primary) 0%, var(--about-footer-bg) 100%);
  padding: 3.5rem 0 4rem;
  border-top: 4px solid var(--about-gold);
}
.page-about__future-inner {
  text-align: center;
  max-width: 800px;
}
.page-about__future-heading {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--about-gold);
  margin: 0 0 1.5rem;
  letter-spacing: -0.01em;
}
.page-about__future-heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--about-gold), var(--about-gold-light));
  border-radius: 2px;
  margin: 0.75rem auto 0;
}
.page-about__future-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--about-cream);
  opacity: 0.9;
  margin: 0 auto 1rem;
  max-width: 680px;
}
.page-about__future-text:last-child {
  margin-bottom: 0;
}

/* 桌面端媒体查询 */
@media (min-width: 768px) {
  .page-about__breadcrumb {
    padding: 1.5rem 2rem 0;
  }
  .page-about__hero {
    margin: 1rem auto 0;
    min-height: 400px;
  }
  .page-about__hero-image {
    min-height: 360px;
  }
  .page-about__hero-overlay {
    padding: 3rem 2.5rem 3rem;
  }
  .page-about__hero-title {
    font-size: 3.2rem;
    max-width: 70%;
  }
  .page-about__hero-subtitle {
    font-size: 1.2rem;
    max-width: 55%;
  }

  .page-about__philosophy {
    padding: 4.5rem 0;
  }
  .page-about__philosophy-inner {
    flex-direction: row;
    gap: 3.5rem;
    align-items: flex-start;
  }
  .page-about__philosophy-content {
    order: 1;
    flex: 1 1 55%;
  }
  .page-about__philosophy-heading {
    font-size: 2.2rem;
  }
  .page-about__philosophy-visual {
    order: 2;
    flex: 0 0 38%;
    max-width: 480px;
  }
  .page-about__philosophy-image {
    border-width: 3px;
  }

  .page-about__milestones {
    padding: 4.5rem 0 4rem;
  }
  .page-about__milestones-heading {
    font-size: 2.2rem;
  }
  .page-about__timeline {
    padding: 0 2rem 0 4rem;
    gap: 3rem;
  }
  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
  }
  .page-about__milestone-card {
    flex-direction: row;
    align-items: flex-start;
    gap: 0;
  }
  .page-about__milestone-connector {
    position: static;
    flex: 0 0 4rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 1.5rem;
  }
  .page-about__milestone-dot {
    width: 24px;
    height: 24px;
  }
  .page-about__milestone-body {
    flex-direction: row;
    gap: 1.5rem;
    padding: 1.5rem 1.75rem;
    max-width: 75%;
  }
  .page-about__milestone-card:nth-child(odd) .page-about__milestone-body {
    margin-right: auto;
    margin-left: 0;
  }
  .page-about__milestone-card:nth-child(even) .page-about__milestone-body {
    margin-left: auto;
    margin-right: 0;
    flex-direction: row-reverse;
    text-align: right;
  }
  .page-about__milestone-card:nth-child(even) .page-about__milestone-icon {
    margin-left: auto;
  }
  .page-about__milestone-card:nth-child(even) .page-about__milestone-text {
    text-align: right;
  }
  .page-about__milestone-icon {
    width: 80px;
    height: 80px;
  }
  .page-about__milestone-title {
    font-size: 1.4rem;
  }
  .page-about__milestone-summary {
    font-size: 1rem;
  }
  .page-about__milestone-detail {
    font-size: 0.95rem;
  }

  .page-about__future {
    padding: 4.5rem 0 5rem;
  }
  .page-about__future-heading {
    font-size: 2.2rem;
  }
  .page-about__future-text {
    font-size: 1.1rem;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    min-height: 480px;
  }
  .page-about__hero-image {
    min-height: 440px;
  }
  .page-about__hero-title {
    font-size: 4rem;
    max-width: 65%;
  }
  .page-about__hero-subtitle {
    font-size: 1.35rem;
    max-width: 45%;
  }
  .page-about__philosophy-heading {
    font-size: 2.5rem;
  }
  .page-about__milestones-heading {
    font-size: 2.5rem;
  }
  .page-about__future-heading {
    font-size: 2.5rem;
  }
}