/* ===== 页面专属CSS：.page-about ===== */
.page-about {
  --about-gap: 2.5rem;
  --about-radius: 0;
  --about-tl-line: 2px;
  --about-dot-size: 16px;
  --about-card-min-h: 280px;
  --about-transition-speed: 0.4s;
  box-sizing: border-box;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
  padding: 1rem 0 0.5rem;
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.85rem;
  color: var(--color-text-secondary, #4A5568);
  max-width: var(--max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  padding-left: 1rem;
  padding-right: 1rem;
}
.page-about .breadcrumb a {
  color: var(--color-primary, #1A3A6B);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: currentColor;
}
.page-about .breadcrumb-sep {
  color: var(--color-neutral-gray, #A0AEC0);
  font-weight: 300;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-text-primary, #1A1A2E);
  font-weight: 400;
}

/* ---------- 两栏顶层网格 ---------- */
.page-about .about-top-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap, 2.5rem);
  max-width: var(--max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  padding: 1rem 1rem 2.5rem;
  width: 100%;
}

/* ---------- 品牌理念（左栏） ---------- */
.page-about .brand-philosophy {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.page-about .section-label {
  display: inline-block;
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--color-primary, #1A3A6B);
  color: var(--color-primary, #1A3A6B);
  background: transparent;
  width: fit-content;
}
.page-about .label-accent {
  border-color: var(--color-accent, #00C853);
  color: var(--color-accent, #00C853);
}
.page-about .philosophy-headline {
  font-family: var(--font-heading, 'Montserrat Black', Arial, sans-serif);
  font-size: clamp(2.2rem, 8vw, 4rem);
  font-weight: 900;
  line-height: 1.05;
  color: var(--color-primary, #1A3A6B);
  margin: 0;
  letter-spacing: -0.02em;
}
.page-about .philosophy-statement {
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-secondary, #4A5568);
  max-width: 520px;
  margin: 0;
}
.page-about .philosophy-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  aspect-ratio: 600 / 400;
  object-fit: cover;
  border: 1px solid var(--color-border, rgba(26,58,107,0.15));
  display: block;
  margin-top: 0.5rem;
}
.page-about .philosophy-cta {
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.95rem;
  color: var(--color-text-secondary, #4A5568);
  margin: 0;
}
.page-about .inline-link {
  color: var(--color-primary, #1A3A6B);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent, #00C853);
  transition: border-color 0.2s, color 0.2s;
  font-weight: 400;
}
.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--color-accent, #00C853);
  border-bottom-color: currentColor;
}

/* ---------- 发展历程时间轴（右栏） ---------- */
.page-about .brand-timeline {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.page-about .timeline-heading {
  font-family: var(--font-heading, 'Montserrat Black', Arial, sans-serif);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-primary, #1A3A6B);
  margin: 0;
  letter-spacing: -0.01em;
}
.page-about .timeline-rail {
  display: flex;
  flex-direction: column;
  position: relative;
  padding-left: 2rem;
}
/* 竖线 */
.page-about .timeline-rail::before {
  content: '';
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 7px;
  width: var(--about-tl-line, 2px);
  background: var(--color-primary, #1A3A6B);
  opacity: 0.2;
}

/* 每个节点 */
.page-about .timeline-node {
  display: block;
  margin-bottom: 0.25rem;
  border: none;
  background: transparent;
}
.page-about .timeline-node[open] {
  margin-bottom: 0.75rem;
}

.page-about .timeline-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.5rem 0.6rem 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-text-primary, #1A1A2E);
  transition: color 0.2s;
  position: relative;
  user-select: none;
}
.page-about .timeline-summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline-summary:hover,
.page-about .timeline-summary:focus-visible {
  color: var(--color-primary, #1A3A6B);
}

/* 圆点 */
.page-about .tl-dot {
  flex-shrink: 0;
  width: var(--about-dot-size, 16px);
  height: var(--about-dot-size, 16px);
  border-radius: 50%;
  background: var(--color-accent, #00C853);
  border: 3px solid var(--color-white, #FFFFFF);
  box-shadow: 0 0 0 2px var(--color-primary, #1A3A6B);
  position: relative;
  z-index: 1;
  transition: transform 0.3s, box-shadow 0.3s;
}
.page-about .timeline-summary:hover .tl-dot,
.page-about .timeline-summary:focus-visible .tl-dot {
  transform: scale(1.18);
  box-shadow: 0 0 0 3px var(--color-accent, #00C853);
}

/* 标签文字 */
.page-about .tl-label {
  flex: 1;
  font-weight: 400;
  line-height: 1.3;
}
/* 箭头 */
.page-about .tl-arrow {
  flex-shrink: 0;
  width: 0.6rem;
  height: 0.6rem;
  border-right: 2px solid var(--color-neutral-gray, #A0AEC0);
  border-bottom: 2px solid var(--color-neutral-gray, #A0AEC0);
  transform: rotate(45deg);
  transition: transform 0.3s;
  margin-left: auto;
}
.page-about .timeline-node[open] .tl-arrow {
  transform: rotate(-135deg);
}

/* 展开内容 */
.page-about .tl-body {
  padding: 0.5rem 0 0.8rem 2.6rem;
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--color-text-secondary, #4A5568);
  max-width: 480px;
}
.page-about .tl-body p {
  margin: 0 0 0.6rem;
}
.page-about .tl-img {
  width: 100%;
  max-width: 200px;
  height: auto;
  aspect-ratio: 200 / 100;
  object-fit: cover;
  border: 1px solid var(--color-border, rgba(26,58,107,0.1));
  display: block;
  margin-top: 0.4rem;
}

/* ---------- 团队理念区 ---------- */
.page-about .team-philosophy {
  max-width: var(--max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  padding: 2.5rem 1rem;
  width: 100%;
  background: var(--color-bg-light, #E8F0FE);
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}
.page-about .team-heading {
  font-family: var(--font-heading, 'Montserrat Black', Arial, sans-serif);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-primary, #1A3A6B);
  margin: 0;
  letter-spacing: -0.01em;
}
.page-about .team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* 翻转卡片 */
.page-about .flip-card {
  perspective: 1000px;
  min-height: var(--about-card-min-h, 280px);
}
.page-about .flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: var(--about-card-min-h, 280px);
  transition: transform var(--about-transition-speed, 0.4s) ease;
  transform-style: preserve-3d;
}
.page-about .flip-card:hover .flip-card-inner,
.page-about .flip-card:focus-within .flip-card-inner {
  transform: rotateY(180deg);
}
.page-about .flip-card-front,
.page-about .flip-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.8rem 1.5rem;
  border: 1px solid var(--color-border, rgba(26,58,107,0.15));
  background: var(--color-white, #FFFFFF);
}
.page-about .flip-card-front {
  align-items: flex-start;
  gap: 0.8rem;
}
.page-about .flip-card-back {
  transform: rotateY(180deg);
  background: var(--color-primary, #1A3A6B);
  color: var(--color-white, #FFFFFF);
  border-color: var(--color-primary, #1A3A6B);
  align-items: center;
  text-align: center;
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.95rem;
  line-height: 1.7;
}
.page-about .flip-card-back p {
  margin: 0;
  max-width: 320px;
}

/* 卡片图标 */
.page-about .card-icon {
  display: block;
  width: 40px;
  height: 40px;
  background: var(--color-bg-light, #E8F0FE);
  border-radius: 0;
  position: relative;
}
.page-about .card-icon-data::after {
  content: '';
  position: absolute;
  inset: 6px;
  border: 2px solid var(--color-primary, #1A3A6B);
  background: linear-gradient(135deg, var(--color-primary, #1A3A6B) 30%, transparent 30%);
  opacity: 0.7;
}
.page-about .card-icon-user::after {
  content: '';
  position: absolute;
  inset: 6px;
  border: 2px solid var(--color-primary, #1A3A6B);
  border-radius: 50% 50% 0 0;
  border-bottom: none;
  height: 55%;
  top: 15%;
}

.page-about .card-title {
  font-family: var(--font-heading, 'Montserrat Black', Arial, sans-serif);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--color-primary, #1A3A6B);
  margin: 0;
}
.page-about .card-brief {
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--color-text-secondary, #4A5568);
  margin: 0;
}
.page-about .team-img-wrapper {
  width: 100%;
  max-width: 500px;
}
.page-about .team-img {
  width: 100%;
  height: auto;
  aspect-ratio: 400 / 300;
  object-fit: cover;
  border: 1px solid var(--color-border, rgba(26,58,107,0.15));
  display: block;
}

/* ---------- 联系方式区 ---------- */
.page-about .brand-contact {
  max-width: var(--max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  padding: 2.5rem 1rem;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .contact-heading {
  font-family: var(--font-heading, 'Montserrat Black', Arial, sans-serif);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-primary, #1A3A6B);
  margin: 0;
  letter-spacing: -0.01em;
}
.page-about .contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--color-accent, #00C853);
  background: var(--color-bg-light, #E8F0FE);
}
.page-about .contact-label {
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary, #1A3A6B);
}
.page-about .contact-value {
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 1rem;
  color: var(--color-text-primary, #1A1A2E);
  word-break: break-all;
}
.page-about .contact-value a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent, #00C853);
}
.page-about .contact-value a:hover {
  border-bottom-color: currentColor;
}
.page-about .contact-note {
  font-family: var(--font-body, 'Inter Light', Arial, sans-serif);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--color-text-secondary, #4A5568);
  margin: 0;
}

/* ========== 桌面端 (min-width: 768px) ========== */
@media (min-width: 768px) {
  .page-about .about-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    padding: 2rem 1.5rem 3rem;
  }
  .page-about .breadcrumb {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
  .page-about .brand-philosophy {
    gap: 1.5rem;
  }
  .page-about .philosophy-headline {
    font-size: clamp(2.8rem, 5vw, 4.5rem);
  }
  .page-about .philosophy-statement {
    font-size: 1.1rem;
  }
  .page-about .timeline-rail {
    padding-left: 2.2rem;
  }
  .page-about .team-cards {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .page-about .contact-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
  }
  .page-about .team-philosophy {
    padding: 3.5rem 1.5rem;
    gap: 2rem;
  }
  .page-about .brand-contact {
    padding: 3rem 1.5rem;
  }
}

/* ========== 大桌面端 (min-width: 1024px) ========== */
@media (min-width: 1024px) {
  .page-about .about-top-grid {
    gap: 4rem;
    padding: 2rem 2rem 3.5rem;
  }
  .page-about .breadcrumb {
    padding-left: 2rem;
    padding-right: 2rem;
  }
  .page-about .team-cards {
    gap: 2.5rem;
  }
  .page-about .contact-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .team-philosophy {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
  }
  .page-about .team-heading {
    width: 100%;
  }
  .page-about .team-cards {
    flex: 1 1 60%;
    max-width: 700px;
  }
  .page-about .team-img-wrapper {
    flex: 0 0 35%;
    max-width: 400px;
    margin-top: 0;
  }
}

/* ========== 极小屏适配 ========== */
@media (max-width: 380px) {
  .page-about .philosophy-headline {
    font-size: 1.8rem;
  }
  .page-about .timeline-summary {
    font-size: 0.85rem;
    padding: 0.4rem 0.3rem 0.4rem 0;
  }
  .page-about .tl-body {
    padding-left: 1.8rem;
    font-size: 0.82rem;
  }
  .page-about .flip-card-front,
  .page-about .flip-card-back {
    padding: 1.2rem 1rem;
  }
  .page-about .contact-item {
    padding: 0.6rem 0.8rem;
  }
}