.page-about {
  --about-gold-light: #F5C518;
  --about-gold-dark: #C9A20E;
  --about-red-accent: #E63946;
  --about-card-bg: #1A2332;
  --about-border-color: #2D3A4A;
  --about-text-gray: #B0B8C4;
  --about-overlay-gradient: linear-gradient(135deg, #0B1D3A 0%, #1A2D4A 60%, #2A3D5A 100%);
  --about-timeline-line: #F5C518;
  --about-shadow-soft: 0 4px 20px rgba(0,0,0,0.3);
  --about-shadow-layered: 0 2px 8px rgba(0,0,0,0.2), 0 8px 32px rgba(0,0,0,0.15);
  --about-radius-card: 12px;
  --about-radius-block: 8px;
  --about-transition: 0.3s ease;
}

/* 面包屑导航 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
  padding: 0.75rem 1rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  font-size: var(--text-small, 0.875rem);
  color: var(--color-gray, #B0B8C4);
  background: transparent;
}
.page-about .breadcrumb a {
  color: var(--color-gray, #B0B8C4);
  text-decoration: none;
  transition: color var(--about-transition);
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent, #F5C518);
}
.page-about .breadcrumb-sep {
  color: var(--color-border, #2D3A4A);
  font-weight: 700;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-white, #FFFFFF);
  font-weight: 600;
}

/* Hero 首屏 */
.page-about .hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding: 2rem 1rem 3rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  position: relative;
}
.page-about .hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--about-overlay-gradient);
  z-index: -1;
  border-radius: 0 0 60px 60px;
}
.page-about .hero__text {
  text-align: center;
}
.page-about .hero__title {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: 2.8rem;
  font-weight: 900;
  font-style: italic;
  color: var(--color-white, #FFFFFF);
  line-height: var(--line-height-heading, 1.1);
  letter-spacing: -0.02em;
  margin: 0 0 0.25rem;
  text-shadow: 0 2px 16px rgba(245,197,24,0.25);
}
.page-about .hero__slogan {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent, #F5C518);
  margin: 0 0 1rem;
  letter-spacing: 0.04em;
}
.page-about .hero__sub {
  font-size: var(--text-body, 1rem);
  color: var(--color-gray, #B0B8C4);
  max-width: 480px;
  margin: 0 auto;
  line-height: var(--line-height-body, 1.7);
}
.page-about .hero__visual {
  width: 100%;
  max-width: 400px;
}
.page-about .hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: var(--about-radius-card);
  box-shadow: var(--about-shadow-layered);
}

/* 面板通用 */
.page-about .panel {
  padding: 2.5rem 1rem;
}
.page-about .panel-inner {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
}

/* 品牌简介 */
.page-about .intro {
  background: var(--color-dark, #0D1117);
}
.page-about .intro__heading {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: var(--text-h2, 2.25rem);
  font-weight: 800;
  font-style: italic;
  color: var(--color-accent, #F5C518);
  margin: 0 0 1.25rem;
  position: relative;
  display: inline-block;
}
.page-about .intro__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 60px;
  height: 3px;
  background: var(--color-accent, #F5C518);
  border-radius: 2px;
}
.page-about .intro__body {
  font-size: var(--text-body, 1rem);
  color: var(--color-white, #FFFFFF);
  line-height: var(--line-height-body, 1.7);
  margin: 0 0 1rem;
  max-width: 720px;
}

/* 时间轴 */
.page-about .timeline-section {
  background: var(--color-primary, #0B1D3A);
  position: relative;
}
.page-about .timeline__heading {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: var(--text-h2, 2.25rem);
  font-weight: 800;
  font-style: italic;
  color: var(--color-accent, #F5C518);
  margin: 0 0 0.5rem;
}
.page-about .timeline__desc {
  color: var(--color-gray, #B0B8C4);
  margin: 0 0 2rem;
  font-size: var(--text-body, 1rem);
}
.page-about .timeline {
  position: relative;
  padding-left: 2rem;
}
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--about-timeline-line), var(--about-gold-dark));
  border-radius: 2px;
}
.page-about .timeline__item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 1.5rem;
}
.page-about .timeline__item:last-child {
  margin-bottom: 0;
}
.page-about .timeline__marker {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}
.page-about .timeline__dot {
  position: absolute;
  left: -1.85rem;
  top: 0.35rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent, #F5C518);
  border: 2px solid var(--color-primary, #0B1D3A);
  box-shadow: 0 0 0 3px var(--color-accent, #F5C518);
  z-index: 1;
}
.page-about .timeline__label {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-accent, #F5C518);
  letter-spacing: 0.03em;
}
.page-about .timeline__detail {
  background: var(--about-card-bg);
  border: 1px solid var(--about-border-color);
  border-radius: var(--about-radius-block);
  overflow: hidden;
  transition: box-shadow var(--about-transition);
}
.page-about .timeline__detail:hover {
  box-shadow: var(--about-shadow-soft);
}
.page-about .timeline__summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.25rem;
  font-weight: 600;
  color: var(--color-white, #FFFFFF);
  cursor: pointer;
  list-style: none;
  transition: background var(--about-transition);
}
.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline__summary:hover {
  background: rgba(245,197,24,0.06);
}
.page-about .timeline__arrow {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-accent, #F5C518);
  border-bottom: 2px solid var(--color-accent, #F5C518);
  transform: rotate(45deg);
  transition: transform var(--about-transition);
  margin-left: 0.75rem;
  flex-shrink: 0;
}
.page-about .timeline__detail[open] .timeline__arrow {
  transform: rotate(-135deg);
}
.page-about .timeline__content {
  padding: 0 1.25rem 1rem;
  color: var(--color-gray, #B0B8C4);
  font-size: var(--text-small, 0.875rem);
  line-height: var(--line-height-body, 1.7);
  border-top: 1px solid var(--about-border-color);
  padding-top: 0.75rem;
}
.page-about .timeline__content p {
  margin: 0;
}
.page-about .timeline__more {
  margin-top: 2rem;
  color: var(--color-gray, #B0B8C4);
  font-size: var(--text-small, 0.875rem);
}
.page-about .timeline__more a {
  color: var(--color-accent, #F5C518);
  text-decoration: none;
  font-weight: 600;
}
.page-about .timeline__more a:hover {
  text-decoration: underline;
}

/* 数据说明 */
.page-about .data-note {
  background: var(--color-dark, #0D1117);
}
.page-about .data-note__layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .data-note__heading {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: var(--text-h2, 2.25rem);
  font-weight: 800;
  font-style: italic;
  color: var(--color-accent, #F5C518);
  margin: 0 0 1rem;
}
.page-about .data-note__block {
  background: var(--about-card-bg);
  padding: 1.5rem;
  border-radius: var(--about-radius-card);
  border: 1px solid var(--about-border-color);
  box-shadow: var(--about-shadow-soft);
}
.page-about .data-note__block p {
  color: var(--color-white, #FFFFFF);
  line-height: var(--line-height-body, 1.7);
  margin: 0 0 1rem;
}
.page-about .data-note__block p:last-child {
  margin-bottom: 0;
}
.page-about .data-note__list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}
.page-about .data-note__list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.6rem;
  color: var(--color-white, #FFFFFF);
  line-height: var(--line-height-body, 1.7);
}
.page-about .data-note__list li::before {
  content: '◆';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent, #F5C518);
  font-size: 0.75rem;
}
.page-about .data-note__list li strong {
  color: var(--color-accent, #F5C518);
}
.page-about .data-note__block a {
  color: var(--color-accent, #F5C518);
  text-decoration: none;
  font-weight: 600;
}
.page-about .data-note__block a:hover {
  text-decoration: underline;
}
.page-about .data-note__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .data-note__img {
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: var(--about-radius-card);
  box-shadow: var(--about-shadow-layered);
}
.page-about .data-note__quote {
  margin-top: 2rem;
}
.page-about .print-border-quote {
  margin: 0;
  padding: 1.25rem 1.5rem;
  border: 3px double var(--color-accent, #F5C518);
  border-radius: var(--about-radius-block);
  background: rgba(245,197,24,0.04);
  position: relative;
  max-width: 600px;
}
.page-about .print-border-quote::before {
  content: '"';
  font-size: 2.5rem;
  font-family: serif;
  color: var(--color-accent, #F5C518);
  position: absolute;
  left: 0.5rem;
  top: -0.4rem;
  line-height: 1;
}
.page-about .print-border-quote p {
  margin: 0;
  color: var(--color-white, #FFFFFF);
  font-style: italic;
  font-size: 1.05rem;
  line-height: var(--line-height-body, 1.7);
}

/* 服务卡片预览 */
.page-about .service-preview {
  background: var(--color-primary, #0B1D3A);
}
.page-about .service-preview__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.page-about .service-preview__card {
  position: relative;
  background: var(--about-card-bg);
  border: 1px solid var(--about-border-color);
  border-radius: var(--about-radius-card);
  padding: 1.5rem;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  cursor: default;
}
.page-about .service-preview__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow-layered);
}
.page-about .service-preview__card .card__title {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: var(--text-h3, 1.75rem);
  font-weight: 700;
  font-style: italic;
  color: var(--color-accent, #F5C518);
  margin: 0 0 0.5rem;
}
.page-about .service-preview__card .card__body {
  color: var(--color-white, #FFFFFF);
  line-height: var(--line-height-body, 1.7);
  margin: 0 0 0.25rem;
}
.page-about .service-preview__card .card__detail {
  max-height: 0;
  overflow: hidden;
  color: var(--color-gray, #B0B8C4);
  font-size: var(--text-small, 0.875rem);
  line-height: var(--line-height-body, 1.7);
  transition: max-height var(--about-transition), padding var(--about-transition);
  padding-top: 0;
}
.page-about .service-preview__card:hover .card__detail {
  max-height: 120px;
  padding-top: 0.75rem;
}

/* 联系我们 */
.page-about .contact-section {
  background: var(--color-dark, #0D1117);
}
.page-about .contact__heading {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-size: var(--text-h2, 2.25rem);
  font-weight: 800;
  font-style: italic;
  color: var(--color-accent, #F5C518);
  margin: 0 0 0.5rem;
}
.page-about .contact__intro {
  color: var(--color-gray, #B0B8C4);
  margin: 0 0 1.5rem;
  font-size: var(--text-body, 1rem);
}
.page-about .contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.page-about .contact__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--about-card-bg);
  padding: 1rem 1.25rem;
  border-radius: var(--about-radius-block);
  border: 1px solid var(--about-border-color);
}
.page-about .contact__icon {
  font-size: 1.4rem;
  color: var(--color-accent, #F5C518);
  flex-shrink: 0;
  width: 2rem;
  text-align: center;
}
.page-about .contact__label {
  font-weight: 600;
  color: var(--color-gray, #B0B8C4);
  min-width: 3.2rem;
  font-size: var(--text-small, 0.875rem);
}
.page-about .contact__value {
  color: var(--color-white, #FFFFFF);
  font-size: var(--text-body, 1rem);
  word-break: break-all;
}
.page-about .contact__value a {
  color: var(--color-accent, #F5C518);
  text-decoration: none;
}
.page-about .contact__value a:hover {
  text-decoration: underline;
}
.page-about .contact__note {
  color: var(--color-gray, #B0B8C4);
  font-size: var(--text-small, 0.875rem);
  line-height: var(--line-height-body, 1.7);
  margin: 0 0 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(245,197,24,0.05);
  border-radius: var(--about-radius-block);
  border-left: 3px solid var(--color-accent, #F5C518);
}
.page-about .contact__faq {
  color: var(--color-gray, #B0B8C4);
  font-size: var(--text-small, 0.875rem);
}
.page-about .contact__faq a {
  color: var(--color-accent, #F5C518);
  text-decoration: none;
  font-weight: 600;
}
.page-about .contact__faq a:hover {
  text-decoration: underline;
}

/* 返回顶部 */
.page-about .back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent, #F5C518);
  color: var(--color-primary, #0B1D3A);
  border: none;
  font-size: 1.4rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--about-transition), visibility var(--about-transition), transform var(--about-transition);
  box-shadow: 0 4px 16px rgba(245,197,24,0.3);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .back-to-top[data-visible] {
  opacity: 1;
  visibility: visible;
}
.page-about .back-to-top:hover {
  transform: scale(1.1);
}

/* 桌面端媒体查询 */
@media (min-width: 768px) {
  .page-about .hero {
    flex-direction: row;
    justify-content: space-between;
    padding: 3rem 2rem 4rem;
  }
  .page-about .hero__text {
    text-align: left;
    flex: 1 1 50%;
  }
  .page-about .hero__title {
    font-size: 4rem;
  }
  .page-about .hero__slogan {
    font-size: 2rem;
  }
  .page-about .hero__sub {
    margin: 0;
  }
  .page-about .hero__visual {
    flex: 0 0 360px;
    max-width: 360px;
  }

  .page-about .panel {
    padding: 4rem 2rem;
  }

  .page-about .timeline {
    padding-left: 3rem;
  }
  .page-about .timeline::before {
    left: 12px;
  }
  .page-about .timeline__dot {
    left: -2.45rem;
    width: 18px;
    height: 18px;
  }
  .page-about .timeline__item {
    padding-left: 2rem;
  }
  .page-about .timeline__label {
    font-size: 1.25rem;
  }
  .page-about .timeline__summary {
    padding: 1rem 1.5rem;
    font-size: 1.05rem;
  }
  .page-about .timeline__content {
    padding: 0.75rem 1.5rem 1.25rem;
    font-size: var(--text-body, 1rem);
  }

  .page-about .data-note__layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }
  .page-about .data-note__text {
    flex: 1 1 60%;
  }
  .page-about .data-note__visual {
    flex: 0 0 240px;
  }
  .page-about .data-note__img {
    max-width: 100%;
  }

  .page-about .service-preview__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

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

  .page-about .breadcrumb {
    padding: 1rem 2rem;
  }
}

@media (min-width: 1024px) {
  .page-about .hero__title {
    font-size: 5rem;
  }
  .page-about .hero__slogan {
    font-size: 2.25rem;
  }
  .page-about .hero__visual {
    flex: 0 0 440px;
    max-width: 440px;
  }
  .page-about .hero__img {
    border-radius: 16px;
  }
  .page-about .data-note__block {
    padding: 2rem;
  }
  .page-about .print-border-quote {
    padding: 1.5rem 2rem;
  }
}