.page-about {
  background-color: var(--primary-deep-blue);
  background-image:
    radial-gradient(ellipse at 85% 8%, rgba(212, 175, 55, 0.08), transparent 42%),
    radial-gradient(ellipse at 8% 65%, rgba(26, 43, 76, 0.55), transparent 55%);
  color: var(--ivory-white);
  font-family: var(--body-font);
  line-height: 1.8;
  overflow-x: hidden;
}

.page-about .section {
  padding: 64px 0;
}

.page-about .section-heading {
  margin: 8px 0 12px;
}

.page-about .section-subheading {
  color: var(--accent-gold);
  font-family: var(--mono-font);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.page-about .section-intro {
  color: var(--misty-blue);
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  margin: 0 0 36px;
}

/* ===== Hero 区 ===== */
.page-about .about-hero {
  position: relative;
  padding-top: 56px;
  padding-bottom: 64px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.16);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.page-about .about-hero-eyebrow {
  font-family: var(--mono-font);
  font-size: 0.8125rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pale-gold);
  margin-bottom: 14px;
}

.page-about .about-hero-copy h1 {
  font-family: var(--heading-font);
  font-size: clamp(2.375rem, 6vw, 3.75rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.04em;
  color: var(--ivory-white);
  margin: 0 0 18px;
}

.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--misty-blue);
  max-width: 60ch;
  margin: 0 0 28px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-emblem {
  display: none;
  justify-content: center;
  align-items: center;
}

.page-about .about-emblem-svg {
  width: 260px;
  height: 260px;
  max-width: 100%;
}

/* ===== 章节快速导航 ===== */
.page-about .about-rapid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(232, 209, 140, 0.18);
}

.page-about .about-rapid a {
  font-family: var(--mono-font);
  font-size: 0.8125rem;
  color: var(--misty-blue);
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(212, 175, 55, 0.35);
  transition: all var(--transition-fast);
}

.page-about .about-rapid a:hover {
  color: var(--ivory-white);
  background: rgba(212, 175, 55, 0.14);
  border-color: var(--accent-gold);
}

/* ===== 品牌足迹 / 时间线 ===== */
.page-about .about-journey {
  background: linear-gradient(180deg, rgba(19, 41, 75, 0.35), rgba(11, 29, 58, 0));
}

.page-about .about-timeline {
  position: relative;
  margin-top: 40px;
  padding-left: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-gold), rgba(212, 175, 55, 0.35), var(--pale-gold));
  border-radius: 2px;
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 44px;
}

.page-about .timeline-dot {
  position: absolute;
  left: -30px;
  top: 10px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14), 0 0 12px rgba(212, 175, 55, 0.3);
  transition: box-shadow var(--transition-medium);
}

.page-about .timeline-item:hover .timeline-dot {
  box-shadow: 0 0 0 7px rgba(212, 175, 55, 0.18), 0 0 18px rgba(212, 175, 55, 0.5);
}

.page-about .timeline-content {
  background: var(--secondary-navy);
  border-radius: 20px;
  padding: 24px;
  border-left: 3px solid rgba(212, 175, 55, 0.5);
  transition: background var(--transition-medium), transform var(--transition-medium), border-left-color var(--transition-medium);
}

.page-about .timeline-item:hover .timeline-content {
  background: var(--ink-blue);
  border-left-color: var(--accent-gold);
  transform: translateX(4px);
}

.page-about .timeline-year {
  font-family: var(--heading-font);
  font-weight: 900;
  font-size: 2.125rem;
  line-height: 1;
  color: var(--accent-gold);
  letter-spacing: 0.03em;
  margin: 0 0 10px;
}

.page-about .timeline-content h3 {
  font-family: var(--heading-font);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ivory-white);
  margin: 0 0 8px;
}

.page-about .timeline-content p {
  color: var(--misty-blue);
  font-size: 0.9375rem;
  line-height: 1.75;
  margin: 0;
}

.page-about .timeline-image {
  margin-top: 16px;
  border-radius: 16px;
  overflow: hidden;
}

.page-about .timeline-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 信赖基石 ===== */
.page-about .about-trust {
  background: var(--secondary-navy);
}

.page-about .trust-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .trust-shield .img-frame {
  border-radius: 24px;
  background: var(--ink-blue);
  padding: 8px;
}

.page-about .trust-shield img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 20px;
}

.page-about .trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .trust-item {
  background: var(--primary-deep-blue);
  border-radius: 18px;
  padding: 22px;
  border-top: 2px solid rgba(212, 175, 55, 0.45);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.page-about .trust-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.25);
}

.page-about .trust-num {
  font-family: var(--mono-font);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin: 0 0 6px;
}

.page-about .trust-item h3 {
  font-family: var(--heading-font);
  font-size: 1.0625rem;
  color: var(--ivory-white);
  margin: 0 0 8px;
}

.page-about .trust-item p {
  color: var(--misty-blue);
  font-size: 0.875rem;
  line-height: 1.65;
  margin: 0;
}

/* ===== 国际视野 ===== */
.page-about .global-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .global-copy p {
  color: var(--misty-blue);
  line-height: 1.8;
  margin: 0 0 24px;
}

.page-about .global-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 0;
  margin: 0;
}

.page-about .global-stats li {
  background: var(--ink-blue);
  border-radius: 16px;
  padding: 18px 10px;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--misty-blue);
}

.page-about .global-stats .mono-num {
  display: block;
  font-family: var(--mono-font);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin-bottom: 4px;
}

.page-about .global-map {
  border-radius: 24px;
  overflow: hidden;
  background: var(--ink-blue);
}

.page-about .global-map img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 合作生态 ===== */
.page-about .about-ecosystem {
  background: rgba(19, 41, 75, 0.5);
}

.page-about .eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .eco-item {
  background: var(--primary-deep-blue);
  border-radius: 20px;
  padding: 26px;
  position: relative;
  transition: box-shadow var(--transition-medium), background var(--transition-medium);
}

.page-about .eco-item:hover {
  background: var(--ink-blue);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

.page-about .eco-item h3 {
  font-family: var(--heading-font);
  font-size: 1.125rem;
  color: var(--ivory-white);
  margin: 18px 0 8px;
}

.page-about .eco-item p {
  color: var(--misty-blue);
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 未来愿景 ===== */
.page-about .vision-frame {
  background: var(--ink-blue);
  border-radius: 28px;
  padding: 48px 26px;
  text-align: center;
  border: 1px solid rgba(232, 209, 140, 0.28);
  position: relative;
}

.page-about .vision-frame::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 18px;
  right: 18px;
  bottom: 18px;
  border: 1px solid rgba(232, 209, 140, 0.18);
  border-radius: 22px;
  pointer-events: none;
}

.page-about .vision-frame .section-heading {
  margin-bottom: 18px;
}

.page-about .vision-text {
  color: var(--misty-blue);
  max-width: 64ch;
  margin: 0 auto 24px;
  line-height: 1.9;
}

.page-about .vision-list {
  list-style: none;
  text-align: left;
  max-width: 480px;
  margin: 0 auto 30px;
  padding: 0;
}

.page-about .vision-list li {
  position: relative;
  padding: 8px 0 8px 28px;
  color: var(--ivory-white);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .vision-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-gold);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.2);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* ===== 信任声明 ===== */
.page-about .about-trustline {
  padding-top: 20px;
  padding-bottom: 56px;
  background: linear-gradient(to bottom, rgba(19, 41, 75, 0.35), rgba(11, 29, 58, 0));
}

.page-about .trustline-text {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  color: var(--pale-gold);
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  line-height: 1.8;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 992px) {
  .page-about .section {
    padding: 88px 0;
  }

  .page-about .about-hero {
    padding-top: 72px;
    padding-bottom: 80px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 64px;
  }

  .page-about .about-hero-emblem {
    display: flex;
  }

  .page-about .trust-layout {
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .global-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 48px;
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .vision-frame {
    padding: 64px 48px;
  }
}

@media (min-width: 640px) and (max-width: 991px) {
  .page-about .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .eco-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}