/* ===== 品牌档案页 专属样式 ===== */
.page-about {
  --page-max-width: 980px;
  --page-gap: 2rem;
  --page-card-bg: #ffffff;
  --page-timeline-line: var(--color-gold, #D4AF37);
  --page-timeline-dot: var(--color-deep-red, #8B0000);
  --page-node-hover-shadow: 0 8px 28px rgba(212, 175, 55, 0.25);
  display: block;
  width: 100%;
  padding: 2rem 1rem 3rem;
  background: var(--color-bg-light, #FFF8DC);
  color: var(--color-text-dark, #1A1A1A);
  font-family: var(--font-body, Arial, Helvetica, sans-serif);
  line-height: 1.6;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: var(--page-max-width, 980px);
  margin: 0 auto 2rem;
  padding: 0.5rem 0;
  font-size: 0.875rem;
  color: var(--color-dark-gray, #2F2F2F);
  border-bottom: 1px solid rgba(47, 47, 47, 0.12);
}
.page-about .breadcrumb a {
  color: var(--color-deep-red, #8B0000);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-gold, #D4AF37);
  text-decoration: underline;
}
.page-about .breadcrumb__sep {
  margin: 0 0.5rem;
  color: var(--color-dark-gray, #2F2F2F);
  opacity: 0.5;
}

/* 通用 section */
.page-about .section {
  max-width: var(--page-max-width, 980px);
  margin: 0 auto 3.5rem;
  position: relative;
}

/* ---- 品牌定位 ---- */
.page-about .brand-positioning {
  margin-bottom: 4rem;
}
.page-about .brand-positioning__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}
.page-about .brand-positioning__text {
  flex: 1;
  order: 2;
}
.page-about .brand-positioning__title {
  font-family: var(--font-heading, Georgia, 'Times New Roman', serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-deep-red, #8B0000);
  margin: 0 0 0.25rem;
  letter-spacing: 0.02em;
  line-height: 1.2;
}
.page-about .brand-positioning__subtitle {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-gold, #D4AF37);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-gold, #D4AF37);
  display: inline-block;
}
.page-about .brand-positioning__desc {
  font-size: 0.95rem;
  margin: 0 0 1rem;
  max-width: 56ch;
  color: var(--color-dark-gray, #2F2F2F);
}
.page-about .brand-positioning__link {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.625rem 1.75rem;
  background: var(--color-gold, #D4AF37);
  color: var(--color-text-dark, #1A1A1A);
  border: 2px solid var(--color-gold, #D4AF37);
  border-radius: 0;
  font-family: var(--font-body, Arial, Helvetica, sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}
.page-about .brand-positioning__link:hover,
.page-about .brand-positioning__link:focus-visible {
  background: transparent;
  color: var(--color-deep-red, #8B0000);
  box-shadow: 0 0 0 2px var(--color-deep-red, #8B0000);
}
.page-about .brand-positioning__visual {
  flex: 0 0 auto;
  order: 1;
  width: 100%;
  max-width: 480px;
  border: 3px solid var(--color-gold, #D4AF37);
  box-shadow: 8px 8px 0 rgba(139, 0, 0, 0.15);
  background: var(--color-bg-dark, #1A1A1A);
  transition: box-shadow 0.3s;
}
.page-about .brand-positioning__visual:hover {
  box-shadow: 10px 10px 0 rgba(139, 0, 0, 0.25);
}
.page-about .brand-positioning__image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---- 服务承诺 ---- */
.page-about .service-commitment {
  margin-bottom: 4rem;
}
.page-about .service-commitment__title {
  font-family: var(--font-heading, Georgia, 'Times New Roman', serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-deep-red, #8B0000);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.page-about .service-commitment__intro {
  font-size: 0.95rem;
  max-width: 60ch;
  color: var(--color-dark-gray, #2F2F2F);
  margin: 0 0 2.25rem;
}

/* 时间线 */
.page-about .service-timeline {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 2.5rem;
}
.page-about .service-timeline::before {
  content: '';
  position: absolute;
  left: 0.875rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--page-timeline-line, #D4AF37);
  opacity: 0.6;
}
.page-about .timeline-node {
  position: relative;
  margin-bottom: 2rem;
  transition: transform 0.3s ease;
}
.page-about .timeline-node:hover {
  transform: translateX(4px);
}
.page-about .timeline-node__marker {
  position: absolute;
  left: -2.5rem;
  top: 0.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 1.75rem;
}
.page-about .timeline-node__dot {
  display: block;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--page-timeline-dot, #8B0000);
  border: 2px solid var(--color-gold, #D4AF37);
  margin-bottom: 0.2rem;
  transition: transform 0.3s, box-shadow 0.3s;
}
.page-about .timeline-node:hover .timeline-node__dot {
  transform: scale(1.35);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.35);
}
.page-about .timeline-node__num {
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--color-gold, #D4AF37);
  letter-spacing: 0.05em;
  line-height: 1;
}
.page-about .timeline-node__card {
  padding: 1.25rem 1.5rem;
  background: var(--page-card-bg, #ffffff);
  border-left: 4px solid var(--color-gold, #D4AF37);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.4s, border-color 0.3s;
}
.page-about .timeline-node__card:hover {
  box-shadow: var(--page-node-hover-shadow, 0 8px 28px rgba(212, 175, 55, 0.25));
  border-left-color: var(--color-deep-red, #8B0000);
}
.page-about .timeline-node__heading {
  font-family: var(--font-body, Arial, Helvetica, sans-serif);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-deep-red, #8B0000);
  margin: 0 0 0.35rem;
}
.page-about .timeline-node__text {
  font-size: 0.9rem;
  color: var(--color-dark-gray, #2F2F2F);
  margin: 0;
}
.page-about .timeline-node__detail {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(47, 47, 47, 0.15);
  font-size: 0.85rem;
  color: var(--color-dark-gray, #2F2F2F);
  opacity: 0.75;
  display: none;
}
.page-about .timeline-node__card:hover .timeline-node__detail,
.page-about .timeline-node__card:focus-within .timeline-node__detail {
  display: block;
}

/* 服务流程图 */
.page-about .service-commitment__flow {
  margin: 1.5rem 0 2rem;
  border: 2px solid var(--color-gold, #D4AF37);
  background: var(--color-bg-dark, #1A1A1A);
  overflow: hidden;
}
.page-about .service-commitment__flow-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  background: var(--color-bg-dark, #1A1A1A);
}
.page-about .service-commitment__extra {
  font-size: 0.9rem;
  color: var(--color-dark-gray, #2F2F2F);
  max-width: 60ch;
  padding: 0.75rem 0 0;
  border-top: 1px solid rgba(47, 47, 47, 0.1);
}
.page-about .service-commitment__extra a {
  color: var(--color-deep-red, #8B0000);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.page-about .service-commitment__extra a:hover {
  color: var(--color-gold, #D4AF37);
}

/* ---- 联系我们 ---- */
.page-about .contact-section {
  margin-bottom: 2rem;
}
.page-about .contact-section__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-dark, #1A1A1A);
  border: 2px solid var(--color-gold, #D4AF37);
  overflow: hidden;
  min-height: 240px;
}
.page-about .contact-section__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
}
.page-about .contact-section__bg-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) brightness(1.2);
}
.page-about .contact-section__content {
  position: relative;
  z-index: 1;
  padding: 2rem 1.5rem;
  color: var(--color-text-light, #F5F5F5);
}
.page-about .contact-section__title {
  font-family: var(--font-heading, Georgia, 'Times New Roman', serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-gold, #D4AF37);
  margin: 0 0 0.75rem;
  line-height: 1.2;
}
.page-about .contact-section__desc {
  font-size: 0.9rem;
  max-width: 52ch;
  margin: 0 0 1.5rem;
  opacity: 0.9;
}
.page-about .contact-section__list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.page-about .contact-section__item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.page-about .contact-section__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-gold, #D4AF37);
  opacity: 0.85;
}
.page-about .contact-section__value {
  font-size: 0.95rem;
  color: var(--color-text-light, #F5F5F5);
  word-break: break-word;
}
.page-about .contact-section__value a {
  color: var(--color-text-light, #F5F5F5);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.2s;
}
.page-about .contact-section__value a:hover {
  color: var(--color-gold, #D4AF37);
}
.page-about .contact-section__note {
  font-size: 0.8rem;
  opacity: 0.75;
  max-width: 56ch;
  margin: 0;
  line-height: 1.5;
}
.page-about .contact-section__note a {
  color: var(--color-gold, #D4AF37);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---- 滚动显现（渐进增强） ---- */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0.01;
    transform: translateY(18px);
  }
  .page-about [data-reveal].visible {
    opacity: 1;
    transform: translateY(0);
  }
  .page-about .timeline-node[data-reveal] {
    transition-delay: 0.1s;
  }
  .page-about .timeline-node[data-reveal]:nth-child(2) {
    transition-delay: 0.2s;
  }
  .page-about .timeline-node[data-reveal]:nth-child(3) {
    transition-delay: 0.3s;
  }
}

/* ---- 响应式 ---- */
/* 最小宽度 640px 起 */
@media (min-width: 640px) {
  .page-about {
    padding: 2.5rem 2rem 4rem;
  }
  .page-about .brand-positioning__inner {
    flex-direction: row;
    align-items: flex-start;
    gap: 2.5rem;
  }
  .page-about .brand-positioning__text {
    order: 1;
    flex: 1;
  }
  .page-about .brand-positioning__visual {
    order: 2;
    flex: 0 0 45%;
    max-width: 400px;
  }
  .page-about .brand-positioning__title {
    font-size: 2.75rem;
  }
  .page-about .brand-positioning__subtitle {
    font-size: 1.05rem;
  }
  .page-about .service-commitment__title {
    font-size: 2.25rem;
  }
  .page-about .contact-section__content {
    padding: 2.5rem 2.5rem;
  }
  .page-about .contact-section__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1.25rem 2.5rem;
  }
  .page-about .contact-section__item {
    flex: 0 0 auto;
    min-width: 14rem;
  }
}

/* 最小宽度 960px 起 */
@media (min-width: 960px) {
  .page-about {
    padding: 3rem 2.5rem 5rem;
  }
  .page-about .brand-positioning__visual {
    flex: 0 0 50%;
    max-width: 480px;
  }
  .page-about .brand-positioning__title {
    font-size: 3.25rem;
  }
  .page-about .brand-positioning__subtitle {
    font-size: 1.125rem;
  }
  .page-about .brand-positioning__desc {
    font-size: 1rem;
  }
  .page-about .service-commitment__title {
    font-size: 2.5rem;
  }
  .page-about .contact-section__title {
    font-size: 2rem;
  }
  .page-about .contact-section__content {
    padding: 3rem 3.5rem;
  }
}