.page-about {
  --about-hero-min-height: 70vh;
  --about-timeline-width: 300px;
  --about-card-gap: 2rem;
  --about-node-indent: 2.5rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 1rem 1.5rem 0;
  font-family: var(--font-body, sans-serif);
  font-size: 0.875rem;
  color: var(--color-light, #E5D9F2);
  opacity: 0.8;
}
.page-about .breadcrumb a {
  color: var(--color-accent, #D4AF37);
  text-decoration: none;
  transition: opacity var(--transition, 0.3s ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  opacity: 0.7;
  outline: 2px solid var(--color-accent, #D4AF37);
  outline-offset: 2px;
}
.page-about .breadcrumb .separator {
  margin: 0 0.5rem;
  color: var(--color-accent, #D4AF37);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-light, #E5D9F2);
  font-weight: 600;
}

/* 首屏 Hero */
.page-about .about-hero {
  position: relative;
  min-height: var(--about-hero-min-height, 70vh);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-primary, linear-gradient(135deg, #2B0F4C, #4A1C74));
  margin: 0 0 3rem;
}
.page-about .about-hero .hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(212,175,55,0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 30%, rgba(212,175,55,0.08) 0%, transparent 50%);
  pointer-events: none;
}
.page-about .about-hero .hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  padding: 4rem 1.5rem;
  max-width: var(--max-width, 1200px);
  width: 100%;
}
.page-about .about-hero .hero-left {
  flex-shrink: 0;
}
.page-about .about-hero .hero-v4 {
  display: block;
  font-family: var(--font-heading, sans-serif);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(5rem, 20vw, 12rem);
  line-height: 1;
  color: var(--color-accent, #D4AF37);
  text-shadow: 0 0 60px rgba(212,175,55,0.35), 0 0 120px rgba(212,175,55,0.15);
  letter-spacing: -0.04em;
  transition: transform 0.1s ease-out;
}
.page-about .about-hero .hero-right h1 {
  margin: 0;
  font-family: var(--font-heading, sans-serif);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  color: var(--color-light, #E5D9F2);
  letter-spacing: 0.02em;
}
.page-about .about-hero .hero-tagline {
  margin: 0.5rem 0 0;
  font-family: var(--font-body, sans-serif);
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  color: var(--color-accent, #D4AF37);
  opacity: 0.9;
  letter-spacing: 0.08em;
}

/* 左右分屏布局 */
.page-about .about-layout {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* 左侧时间轴 */
.page-about .about-timeline {
  width: 100%;
}
.page-about .about-timeline .timeline-sticky {
  position: relative;
}
.page-about .about-timeline .timeline-heading {
  font-family: var(--font-heading, sans-serif);
  font-weight: 800;
  font-style: italic;
  font-size: 1.5rem;
  color: var(--color-accent, #D4AF37);
  margin: 0 0 1.5rem;
  letter-spacing: 0.04em;
  position: relative;
  padding-left: 1rem;
  border-left: 4px solid var(--color-accent, #D4AF37);
}
.page-about .about-timeline .timeline-track {
  position: relative;
  padding-left: var(--about-node-indent, 2.5rem);
}
.page-about .about-timeline .timeline-track::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent, #D4AF37), transparent);
  opacity: 0.5;
}
/* 时间轴节点 */
.page-about .timeline-node {
  display: block;
  margin-bottom: 1.25rem;
  border: none;
  background: transparent;
  color: var(--color-light, #E5D9F2);
}
.page-about .timeline-node[open] .node-detail {
  animation: fadeSlideIn 0.3s ease;
}
.page-about .timeline-node .node-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(212,175,55,0.06);
  border: 1px solid rgba(212,175,55,0.15);
  border-radius: 8px;
  cursor: pointer;
  list-style: none;
  transition: background var(--transition, 0.3s ease), border-color var(--transition, 0.3s ease);
}
.page-about .timeline-node .node-summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline-node .node-summary:hover {
  background: rgba(212,175,55,0.12);
  border-color: rgba(212,175,55,0.35);
}
.page-about .timeline-node .node-summary:focus-visible {
  outline: 2px solid var(--color-accent, #D4AF37);
  outline-offset: 2px;
}
.page-about .timeline-node .node-marker {
  position: absolute;
  left: calc(-1 * var(--about-node-indent, 2.5rem) + 4px);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent, #D4AF37);
  border: 2px solid var(--color-primary, #2B0F4C);
  flex-shrink: 0;
}
.page-about .timeline-node .node-year {
  font-family: var(--font-mono, monospace);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-accent, #D4AF37);
  min-width: 3.5rem;
  flex-shrink: 0;
}
.page-about .timeline-node .node-label {
  font-family: var(--font-body, sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-light, #E5D9F2);
}
.page-about .timeline-node .node-detail {
  padding: 0.75rem 1rem 0.5rem 1rem;
  margin-top: 0.25rem;
  font-family: var(--font-body, sans-serif);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-light, #E5D9F2);
  opacity: 0.85;
  border-left: 2px solid var(--color-accent, #D4AF37);
  margin-left: 1rem;
}
.page-about .timeline-node .node-detail p {
  margin: 0;
}
@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
/* 时间轴图片 */
.page-about .timeline-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 2rem;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: var(--shadow-glow, 0 0 30px rgba(212,175,55,0.15));
}

/* 右侧内容区 */
.page-about .about-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--about-card-gap, 2rem);
}

/* 内容卡片 */
.page-about .content-card {
  background: rgba(75, 28, 116, 0.25);
  border: 1px solid rgba(212,175,55,0.12);
  border-radius: 16px;
  padding: 1.75rem 1.5rem;
  transition: transform var(--transition, 0.3s ease), box-shadow var(--transition, 0.3s ease);
  box-shadow: 0 4px 24px rgba(0,0,0,0.2);
}
.page-about .content-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(0,0,0,0.3), var(--shadow-glow, 0 0 30px rgba(212,175,55,0.15));
}
.page-about .card-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.page-about .card-header .chapter-number {
  font-family: var(--font-mono, monospace);
  font-weight: 700;
  font-size: 2rem;
  color: var(--color-accent, #D4AF37);
  line-height: 1;
  flex-shrink: 0;
}
.page-about .card-header .chapter-title {
  margin: 0;
  font-family: var(--font-heading, sans-serif);
  font-weight: 800;
  font-style: italic;
  font-size: 1.5rem;
  color: var(--color-light, #E5D9F2);
  letter-spacing: 0.02em;
}
.page-about .card-body {
  font-family: var(--font-body, sans-serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-light, #E5D9F2);
}
.page-about .card-body p {
  margin: 0 0 1rem;
}
.page-about .card-body p:last-child {
  margin-bottom: 0;
}
.page-about .card-body .btn {
  margin-top: 0.5rem;
}

/* 升级亮点网格 */
.page-about .upgrade-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .upgrade-item {
  background: rgba(16,5,32,0.3);
  border-radius: 12px;
  padding: 1.25rem;
  border-left: 3px solid var(--color-accent, #D4AF37);
}
.page-about .upgrade-item .upgrade-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading, sans-serif);
  font-weight: 700;
  font-style: italic;
  font-size: 1.1rem;
  color: var(--color-accent, #D4AF37);
  letter-spacing: 0.02em;
}
.page-about .upgrade-item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-light, #E5D9F2);
  opacity: 0.9;
}
.page-about .upgrade-item .upgrade-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 1rem;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

/* 服务承诺列表 */
.page-about .commitment-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.page-about .commitment-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.page-about .commitment-item .commitment-icon {
  font-size: 1.3rem;
  color: var(--color-accent, #D4AF37);
  flex-shrink: 0;
  margin-top: 0.15rem;
}
.page-about .commitment-item h3 {
  margin: 0 0 0.25rem;
  font-family: var(--font-heading, sans-serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-accent, #D4AF37);
  letter-spacing: 0.02em;
}
.page-about .commitment-item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-light, #E5D9F2);
  opacity: 0.85;
}

/* 本地支持 */
.page-about .local-body {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .local-info p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-light, #E5D9F2);
  opacity: 0.9;
}
.page-about .contact-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.page-about .contact-list li {
  font-family: var(--font-body, sans-serif);
  font-size: 0.95rem;
  color: var(--color-light, #E5D9F2);
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(212,175,55,0.1);
}
.page-about .contact-list .contact-label {
  font-weight: 600;
  color: var(--color-accent, #D4AF37);
  margin-right: 0.25rem;
}
.page-about .contact-note {
  font-size: 0.85rem;
  color: var(--color-accent, #D4AF37);
  opacity: 0.8;
  margin-top: 0.5rem;
}
.page-about .local-img {
  display: block;
  width: 100%;
  max-width: 200px;
  height: auto;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: var(--shadow-glow, 0 0 30px rgba(212,175,55,0.15));
  margin: 0 auto;
}

/* 信任声明 */
.page-about .trust-statement {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  text-align: center;
}
.page-about .trust-statement p {
  font-family: var(--font-body, sans-serif);
  font-size: 0.9rem;
  color: var(--color-light, #E5D9F2);
  opacity: 0.7;
  padding: 1rem 1.5rem;
  border: 1px solid rgba(212,175,55,0.15);
  border-radius: 12px;
  background: rgba(16,5,32,0.25);
  display: inline-block;
  max-width: 700px;
  margin: 0 auto;
}

/* 桌面端布局 */
@media (min-width: 900px) {
  .page-about .about-hero .hero-inner {
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
    padding: 5rem 2rem;
  }
  .page-about .about-hero .hero-left {
    flex: 0 0 auto;
  }
  .page-about .about-hero .hero-v4 {
    font-size: clamp(8rem, 18vw, 14rem);
  }
  .page-about .about-hero .hero-right {
    text-align: right;
  }
  .page-about .about-hero .hero-right h1 {
    font-size: clamp(2.2rem, 4vw, 3.6rem);
  }
  .page-about .about-hero .hero-tagline {
    font-size: 1.15rem;
  }

  .page-about .about-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
    padding: 0 2rem 4rem;
  }
  .page-about .about-timeline {
    width: var(--about-timeline-width, 300px);
    flex-shrink: 0;
  }
  .page-about .about-timeline .timeline-sticky {
    position: sticky;
    top: calc(var(--header-height, 56px) + 1.5rem);
  }
  .page-about .about-content {
    flex: 1;
    min-width: 0;
  }
  .page-about .content-card {
    padding: 2rem 2rem;
  }
  .page-about .card-header .chapter-number {
    font-size: 2.4rem;
  }
  .page-about .card-header .chapter-title {
    font-size: 1.7rem;
  }
  .page-about .upgrade-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .page-about .upgrade-item:first-child {
    grid-column: 1 / 2;
  }
  .page-about .upgrade-item:nth-child(2) {
    grid-column: 2 / 3;
  }
  .page-about .upgrade-item:nth-child(3) {
    grid-column: 1 / 3;
  }
  .page-about .local-body {
    flex-direction: row;
    align-items: flex-start;
    gap: 2rem;
  }
  .page-about .local-info {
    flex: 1;
  }
  .page-about .local-img {
    flex-shrink: 0;
    margin: 0;
  }
  .page-about .commitment-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem 2rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    margin: 0 0 4rem;
  }
  .page-about .about-hero .hero-inner {
    padding: 6rem 0;
  }
  .page-about .about-layout {
    padding: 0 0 5rem;
  }
  .page-about .about-timeline {
    width: 340px;
  }
  .page-about .content-card {
    padding: 2.5rem 2.5rem;
  }
}