/* ===== 品牌档案页 - 专属样式 ===== */
.page-about {
  --about-sidebar-width: 34%;
  --about-main-width: 66%;
  --about-timeline-color: var(--color-primary);
  --about-accent-color: var(--color-secondary);
  --about-grid-bg: linear-gradient(0deg, rgba(0,102,204,0.03) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(0,102,204,0.03) 1px, transparent 1px);
  --about-grid-size: 32px;
  --about-card-radius: 8px;
  --about-transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  background-color: var(--color-bg);
  background-image: var(--about-grid-bg);
  background-size: var(--about-grid-size) var(--about-grid-size);
  padding: 2rem 1.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
}

/* --- 面包屑 --- */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--size-small);
  color: var(--color-text-secondary);
  margin-bottom: 1.75rem;
  letter-spacing: 0.02em;
}
.about-breadcrumb-link {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
.about-breadcrumb-link:hover,
.about-breadcrumb-link:focus-visible {
  color: var(--color-primary-hover);
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
}
.about-breadcrumb-sep {
  color: var(--color-border-strong);
  font-size: 0.75rem;
}
.about-breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* --- 杂志跨页布局 --- */
.about-spread {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
  position: relative;
}

/* --- 左侧窄栏 --- */
.about-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 1.5rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--about-card-radius);
  box-shadow: var(--shadow-card);
  position: relative;
}
.about-logo-box {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem 0;
}
.about-logo-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
}

/* --- 品牌使命 --- */
.about-mission-heading {
  font-family: var(--font-heading);
  font-size: var(--size-h2);
  line-height: var(--line-height-heading);
  color: var(--color-text);
  margin: 0 0 1rem;
  letter-spacing: var(--letter-spacing);
  position: relative;
  padding-bottom: 0.75rem;
}
.about-mission-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 64px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}
.about-mission-text {
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--line-height-body);
  color: var(--color-text);
  margin: 0 0 0.75rem;
  font-weight: 450;
}
.about-mission-sub {
  font-family: var(--font-body);
  font-size: var(--size-small);
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 0 1rem;
}
.about-mission-trust {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background-color: var(--color-primary-light);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: var(--size-small);
  color: var(--color-primary);
  font-weight: 500;
}
.about-mission-trust-icon {
  font-size: 1.1rem;
  color: var(--color-primary);
}

.about-landmark {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.75rem 0;
  border-top: 1px solid var(--color-border);
  margin-top: 0.5rem;
}
.about-landmark-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  opacity: 0.85;
  transition: opacity var(--transition);
}
.about-landmark-img:hover {
  opacity: 1;
}

/* --- 右侧宽栏 --- */
.about-main {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  position: relative;
}
.about-main-header {
  padding-bottom: 0.5rem;
}
.about-main-kicker {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--size-h2);
  line-height: var(--line-height-heading);
  color: var(--color-text);
  margin: 0 0 0.5rem;
  letter-spacing: var(--letter-spacing);
  position: relative;
}
.about-main-kicker::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 48px;
  height: 4px;
  background: var(--color-secondary);
  border-radius: 2px;
}
.about-main-intro {
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
  margin: 1rem 0 0;
  max-width: 480px;
}

/* --- 时间轴 --- */
.about-timeline {
  position: relative;
  padding-left: 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0.875rem;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: 2px;
  opacity: 0.35;
}
.timeline-item {
  position: relative;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: transform var(--about-transition);
}
.timeline-item:hover {
  transform: translateX(4px);
}
.timeline-dot {
  position: absolute;
  left: -2.25rem;
  top: 0.35rem;
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
  z-index: 1;
}
.timeline-dot-inner {
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--color-card);
  box-shadow: 0 0 0 2px var(--color-primary), 0 2px 8px rgba(0,102,204,0.25);
  transition: all var(--about-transition);
}
.timeline-dot:hover .timeline-dot-inner,
.timeline-dot:focus-visible .timeline-dot-inner {
  transform: scale(1.35);
  background-color: var(--color-secondary);
  box-shadow: 0 0 0 2px var(--color-secondary), 0 4px 16px rgba(255,102,0,0.35);
}
.timeline-dot:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
  border-radius: 50%;
}
.timeline-content {
  flex: 1;
  min-width: 0;
  transition: all var(--about-transition);
}
.timeline-item:hover .timeline-content {
  padding-left: 0.25rem;
}
.timeline-phase {
  display: inline-block;
  font-family: var(--font-digit);
  font-size: var(--size-small);
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  padding: 0.2rem 0.75rem;
  border-radius: 12px;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
  transition: background-color var(--about-transition), color var(--about-transition);
}
.timeline-item:hover .timeline-phase {
  background-color: var(--color-secondary-light);
  color: var(--color-secondary-hover);
}
.timeline-desc {
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: 1.7;
  color: var(--color-text);
  margin: 0;
  transition: color var(--about-transition);
}
.timeline-item:hover .timeline-desc {
  color: var(--color-text);
}

/* --- 背景装饰图 --- */
.about-bg-art {
  display: none;
  position: absolute;
  right: 0;
  bottom: 0;
  width: 180px;
  height: auto;
  pointer-events: none;
  opacity: 0.4;
  z-index: 0;
}
.about-bg-art-img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
}

/* --- 服务承诺 --- */
.about-commitments {
  margin-top: 1rem;
  padding-top: 2.5rem;
  border-top: 2px solid var(--color-border);
}
.about-commitments-heading {
  font-family: var(--font-heading);
  font-size: var(--size-h2);
  line-height: var(--line-height-heading);
  color: var(--color-text);
  margin: 0 0 2rem;
  letter-spacing: var(--letter-spacing);
  position: relative;
  display: inline-block;
}
.about-commitments-heading::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
  opacity: 0.5;
}
.commitments-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.commitment-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--about-card-radius);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--about-transition), box-shadow var(--about-transition), border-color var(--about-transition);
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  cursor: default;
}
.commitment-card:hover,
.commitment-card:focus-within {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary);
}
.commitment-card:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}
.commitment-card-icon {
  font-size: 2rem;
  color: var(--color-primary);
  line-height: 1;
  transition: color var(--about-transition), transform var(--about-transition);
}
.commitment-card:hover .commitment-card-icon {
  color: var(--color-secondary);
  transform: scale(1.1);
}
.commitment-card-title {
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  line-height: var(--line-height-heading);
  color: var(--color-text);
  margin: 0;
  letter-spacing: var(--letter-spacing);
}
.commitment-card-text {
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
  margin: 0;
  flex: 1;
}
.commitment-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-body);
  font-size: var(--size-small);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  padding: 0.375rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  align-self: flex-start;
  margin-top: 0.25rem;
}
.commitment-card-link:hover,
.commitment-card-link:focus-visible {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
  outline: none;
}
.commitment-card-link:focus-visible {
  outline: var(--focus-outline);
  outline-offset: var(--focus-offset);
  border-radius: 2px;
}

/* --- 底部品牌宣言 --- */
.about-footer-note {
  margin-top: 3rem;
  padding: 1.25rem 1.5rem;
  background: var(--gradient-primary);
  border-radius: var(--about-card-radius);
  text-align: center;
}
.about-footer-note-text {
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: var(--line-height-body);
  color: #ffffff;
  margin: 0;
  font-weight: 450;
  letter-spacing: 0.03em;
}

/* ===== 响应式 - 桌面端 ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 2.5rem 2rem 4rem;
  }

  .about-spread {
    flex-direction: row;
    gap: 2.5rem;
    align-items: stretch;
  }

  .about-sidebar {
    flex: 0 0 var(--about-sidebar-width);
    max-width: var(--about-sidebar-width);
    padding: 2rem 1.75rem;
    position: sticky;
    top: calc(var(--header-height) + 2rem);
    align-self: flex-start;
    max-height: calc(100vh - var(--header-height) - 4rem);
    overflow-y: auto;
    border-right: 1px solid var(--color-border);
    border-radius: var(--about-card-radius) 0 0 var(--about-card-radius);
  }

  .about-main {
    flex: 1;
    min-width: 0;
    padding-left: 0.5rem;
  }

  .about-main-header {
    padding-bottom: 0.75rem;
  }
  .about-main-kicker {
    font-size: var(--size-h1);
  }
  .about-main-intro {
    font-size: 1.125rem;
  }

  .about-timeline {
    padding-left: 2.75rem;
    gap: 2.5rem;
  }
  .about-timeline::before {
    left: 1rem;
  }
  .timeline-dot {
    left: -2.75rem;
    width: 2rem;
    height: 2rem;
  }
  .timeline-dot-inner {
    width: 1.125rem;
    height: 1.125rem;
  }
  .timeline-phase {
    font-size: var(--size-body);
    padding: 0.25rem 1rem;
  }
  .timeline-desc {
    font-size: 1.0625rem;
  }

  .about-bg-art {
    display: block;
    width: 220px;
    opacity: 0.3;
  }

  .about-commitments {
    margin-top: 2rem;
    padding-top: 3rem;
  }
  .commitments-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
  .commitment-card {
    padding: 2rem 1.75rem;
  }

  .about-footer-note {
    padding: 1.5rem 2rem;
    margin-top: 4rem;
  }
  .about-footer-note-text {
    font-size: 1.125rem;
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding: 3rem 2.5rem 5rem;
  }
  .about-sidebar {
    padding: 2.5rem 2rem;
  }
  .about-mission-heading {
    font-size: 2.25rem;
  }
  .about-main-kicker {
    font-size: 3.25rem;
  }
  .about-timeline {
    gap: 2.75rem;
  }
  .about-bg-art {
    width: 280px;
    opacity: 0.25;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .timeline-item:hover {
    transform: none;
  }
  .commitment-card:hover {
    transform: none;
  }
}