/* ============================================
   页面专属样式：品牌档案（.page-about）
   移动端优先 + 桌面增强
   ============================================ */
.page-about {
  --about-hero-bg: #0A1D3A;
  --about-hero-border: #D4AF37;
  --about-hero-text-light: #FFFFFF;
  --about-hero-accent: #FF6B35;
  --about-mission-bg: #0F2A4A;
  --about-card-bg: #FFFFFF;
  --about-timeline-line: #D4AF37;
  --about-timeline-dot: #0B3D91;
  --about-section-gap: 3rem;
  --about-card-radius: 8px;
  --about-transition: 0.3s ease;
  --about-font-heading: 'Montserrat Black', 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --about-font-body: 'Roboto Light', 'Segoe UI', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ---- 框景首屏 ---- */
.page-about .about-hero {
  position: relative;
  background: var(--about-hero-bg);
  padding: 2rem 0 3rem;
  overflow: hidden;
  margin-bottom: 0;
}

.page-about .about-hero-frame {
  position: relative;
  border: 2px solid var(--about-hero-border);
  margin: 0 0.75rem;
  padding: 2rem 1rem 1.5rem;
  background: rgba(10, 29, 58, 0.85);
  box-shadow: 0 0 0 1px rgba(212, 175, 55, 0.3) inset;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero-bread {
  font-family: var(--about-font-body);
  font-size: 0.75rem;
  color: var(--about-hero-text-light);
  opacity: 0.7;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.page-about .about-hero-bread a {
  color: var(--about-hero-accent);
  text-decoration: none;
  transition: opacity var(--about-transition);
}

.page-about .about-hero-bread a:hover {
  opacity: 0.8;
}

.page-about .about-hero-bread .breadcrumb-current {
  color: var(--about-hero-text-light);
  opacity: 0.6;
}

.page-about .about-hero-main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}

.page-about .about-hero-text {
  flex: 1;
}

.page-about .about-hero-title {
  font-family: var(--about-font-heading);
  font-size: 2.8rem;
  line-height: 1.1;
  color: var(--about-hero-text-light);
  margin: 0 0 0.25rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.page-about .about-hero-tagline {
  font-family: var(--about-font-body);
  font-size: 1.1rem;
  color: var(--about-hero-accent);
  margin: 0 0 1.25rem;
  font-weight: 300;
  letter-spacing: 0.08em;
}

.page-about .about-hero-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about .about-hero-nav .tag {
  font-family: var(--about-font-body);
  font-weight: 500;
  font-size: 0.75rem;
  padding: 0.3rem 0.75rem;
  border-radius: 2px;
  background: transparent;
  border: 1px solid var(--about-hero-border);
  color: var(--about-hero-border);
  text-decoration: none;
  transition: background var(--about-transition), color var(--about-transition);
}

.page-about .about-hero-nav .tag:hover {
  background: var(--about-hero-border);
  color: var(--about-hero-bg);
}

.page-about .about-hero-graphic {
  flex-shrink: 0;
  align-self: center;
}

.page-about .about-hero-img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid rgba(212, 175, 55, 0.4);
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-hero-diagonal {
  position: absolute;
  top: -30%;
  right: -10%;
  width: 60%;
  height: 160%;
  background: rgba(255, 107, 53, 0.04);
  transform: skewX(-12deg);
  pointer-events: none;
  z-index: 0;
}

/* ---- 品牌使命 ---- */
.page-about .about-mission {
  position: relative;
  padding: 3rem 0;
  overflow: hidden;
  background: var(--about-mission-bg);
}

.page-about .about-mission-bg-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-about .about-mission-bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  display: block;
  max-width: 100%;
}

.page-about .about-mission-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 29, 58, 0.88) 30%, rgba(10, 29, 58, 0.60) 100%);
  z-index: 1;
}

.page-about .about-mission-content {
  position: relative;
  z-index: 2;
  color: var(--about-hero-text-light);
}

.page-about .about-section-title {
  font-family: var(--about-font-heading);
  font-size: 1.75rem;
  line-height: 1.2;
  color: inherit;
  margin: 0 0 1rem;
  position: relative;
  display: inline-block;
}

.page-about .about-section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--about-hero-border);
  margin-top: 0.5rem;
}

.page-about .about-mission-text {
  font-family: var(--about-font-body);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0 0 1.5rem;
  max-width: 720px;
  opacity: 0.92;
}

.page-about .about-mission-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
}

.page-about .about-mission-stats .data-display {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-mission-stats .data-number {
  font-family: var(--about-font-heading);
  font-size: 1.8rem;
  color: var(--about-hero-accent);
  line-height: 1.1;
}

.page-about .about-mission-stats .data-label {
  font-family: var(--about-font-body);
  font-size: 0.8rem;
  color: var(--about-hero-text-light);
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---- 核心功能概述 ---- */
.page-about .about-features {
  padding: 3rem 0;
  background: var(--light-bg);
  position: relative;
}

.page-about .about-features-intro {
  font-family: var(--about-font-body);
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: -0.5rem 0 1.5rem;
  max-width: 600px;
}

.page-about .about-features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-feature-card {
  background: var(--about-card-bg);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--about-transition), transform var(--about-transition);
  position: relative;
}

.page-about .about-feature-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.page-about .about-feature-card .card-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.25rem 0.5rem;
}

.page-about .about-feature-icon {
  font-size: 1.6rem;
  line-height: 1;
  flex-shrink: 0;
}

.page-about .about-feature-title {
  font-family: var(--about-font-heading);
  font-size: 1.05rem;
  margin: 0;
  color: var(--text-primary);
}

.page-about .about-feature-card .card-body {
  padding: 0.25rem 1.25rem 0.75rem;
  position: relative;
}

.page-about .about-feature-desc {
  font-family: var(--about-font-body);
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

.page-about .about-feature-detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.4s ease, margin 0.3s ease;
  margin-top: 0;
}

.page-about .about-feature-detail p {
  font-family: var(--about-font-body);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
  padding-top: 0.6rem;
  border-top: 1px solid rgba(11, 61, 145, 0.1);
}

.page-about .about-feature-card:hover .about-feature-detail {
  max-height: 200px;
  opacity: 1;
  margin-top: 0.5rem;
}

.page-about .about-feature-card .card-footer {
  padding: 0 1.25rem 1rem;
  display: flex;
  gap: 0.5rem;
}

.page-about .about-feature-card .card-footer .tag {
  font-family: var(--about-font-body);
  font-weight: 500;
  font-size: 0.75rem;
  padding: 0.25rem 0.7rem;
  border-radius: 2px;
  text-decoration: none;
  transition: background var(--about-transition), color var(--about-transition);
}

.page-about .about-features-graphic {
  margin-top: 1.5rem;
  text-align: center;
}

.page-about .about-features-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-card);
  box-shadow: 0 2px 8px rgba(10, 29, 58, 0.08);
  display: block;
  margin: 0 auto;
}

/* ---- 技术优势（时间轴） ---- */
.page-about .about-tech {
  padding: 3rem 0;
  background: var(--dark-bg);
  color: var(--text-inverse);
  position: relative;
}

.page-about .about-tech-intro {
  font-family: var(--about-font-body);
  font-size: 0.95rem;
  color: var(--text-inverse-dim);
  margin: -0.5rem 0 2rem;
  max-width: 560px;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 2.5rem;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 0.9rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--about-timeline-line);
  opacity: 0.5;
}

.page-about .about-timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--about-timeline-dot);
  border: 2px solid var(--about-timeline-line);
  border-radius: 50%;
  z-index: 1;
}

.page-about .about-timeline-num {
  font-family: var(--about-font-heading);
  font-size: 0.7rem;
  color: var(--text-inverse);
  line-height: 1;
}

.page-about .about-timeline-content {
  padding-top: 0.1rem;
}

.page-about .about-timeline-title {
  font-family: var(--about-font-heading);
  font-size: 1.1rem;
  margin: 0 0 0.35rem;
  color: var(--about-hero-border);
  line-height: 1.2;
}

.page-about .about-timeline-desc {
  font-family: var(--about-font-body);
  font-size: 0.88rem;
  color: var(--text-inverse-dim);
  line-height: 1.6;
  margin: 0;
  max-width: 580px;
}

/* ---- 联系方式提示 ---- */
.page-about .about-contact {
  padding: 3rem 0;
  background: var(--light-bg);
}

.page-about .about-contact-frame {
  position: relative;
  border: 2px solid var(--about-hero-border);
  padding: 2rem 1.5rem;
  background: var(--about-card-bg);
  box-shadow: 0 0 0 1px rgba(212, 175, 55, 0.2) inset;
}

.page-about .about-contact-content {
  position: relative;
  z-index: 1;
}

.page-about .about-contact-text {
  font-family: var(--about-font-body);
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: -0.5rem 0 1.5rem;
  max-width: 580px;
}

.page-about .about-contact-info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about .about-contact-item {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: baseline;
}

.page-about .about-contact-label {
  font-family: var(--about-font-heading);
  font-size: 0.8rem;
  color: var(--text-primary);
  min-width: 3rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.page-about .about-contact-value {
  font-family: var(--about-font-body);
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.page-about .about-contact-value a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--about-transition);
}

.page-about .about-contact-value a:hover {
  color: var(--accent);
}

.page-about .about-contact-note {
  font-family: var(--about-font-body);
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-style: italic;
  margin: 0 0 1.25rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--about-hero-border);
}

.page-about .about-contact-content .btn {
  font-family: var(--about-font-body);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.5rem 1.25rem;
  border-radius: 2px;
  text-decoration: none;
  display: inline-block;
  transition: background var(--about-transition), transform var(--about-transition);
}

.page-about .about-contact-content .btn:hover {
  transform: translateY(-1px);
}

/* ---- :target 高亮（滚动章节高亮） ---- */
.page-about .about-mission:target .about-section-title,
.page-about .about-features:target .about-section-title,
.page-about .about-tech:target .about-section-title,
.page-about .about-contact:target .about-section-title {
  color: var(--about-hero-accent);
}

.page-about .about-mission:target .about-section-title::after,
.page-about .about-features:target .about-section-title::after,
.page-about .about-tech:target .about-section-title::after,
.page-about .about-contact:target .about-section-title::after {
  background: var(--about-hero-accent);
  width: 80px;
}

.page-about .about-mission:target,
.page-about .about-features:target,
.page-about .about-tech:target,
.page-about .about-contact:target {
  scroll-margin-top: 90px;
}

/* ============================================
   桌面端增强（≥768px）
   ============================================ */
@media (min-width: 768px) {
  .page-about {
    --about-section-gap: 4rem;
  }

  .page-about .about-hero {
    padding: 3rem 0 4rem;
  }

  .page-about .about-hero-frame {
    margin: 0 2rem;
    padding: 2.5rem 2rem;
  }

  .page-about .about-hero-main {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-hero-title {
    font-size: 4rem;
  }

  .page-about .about-hero-tagline {
    font-size: 1.3rem;
  }

  .page-about .about-hero-img {
    width: 260px;
    height: 260px;
  }

  .page-about .about-hero-diagonal {
    right: -5%;
    width: 40%;
  }

  .page-about .about-mission {
    padding: 4rem 0;
  }

  .page-about .about-section-title {
    font-size: 2rem;
  }

  .page-about .about-mission-text {
    font-size: 1.05rem;
  }

  .page-about .about-mission-stats .data-number {
    font-size: 2.2rem;
  }

  .page-about .about-features {
    padding: 4rem 0;
  }

  .page-about .about-features-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .page-about .about-features-intro {
    font-size: 1rem;
  }

  .page-about .about-feature-card .card-heading {
    padding: 1.5rem 1.5rem 0.5rem;
  }

  .page-about .about-feature-card .card-body {
    padding: 0.25rem 1.5rem 0.75rem;
  }

  .page-about .about-feature-card .card-footer {
    padding: 0 1.5rem 1.25rem;
  }

  .page-about .about-features-graphic {
    margin-top: 2rem;
  }

  .page-about .about-tech {
    padding: 4rem 0;
  }

  .page-about .about-timeline {
    padding-left: 3rem;
  }

  .page-about .about-timeline::before {
    left: 1.1rem;
  }

  .page-about .about-timeline-marker {
    left: -3rem;
    width: 2.4rem;
    height: 2.4rem;
  }

  .page-about .about-timeline-num {
    font-size: 0.8rem;
  }

  .page-about .about-timeline-title {
    font-size: 1.2rem;
  }

  .page-about .about-timeline-desc {
    font-size: 0.92rem;
  }

  .page-about .about-contact {
    padding: 4rem 0;
  }

  .page-about .about-contact-frame {
    padding: 2.5rem 2rem;
  }

  .page-about .about-contact-info {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1rem 2.5rem;
  }

  .page-about .about-contact-text {
    font-size: 1rem;
  }
}

/* ============================================
   桌面端大屏（≥1024px）
   ============================================ */
@media (min-width: 1024px) {
  .page-about .about-hero-frame {
    margin: 0 3rem;
    padding: 3rem 2.5rem;
  }

  .page-about .about-hero-title {
    font-size: 5rem;
  }

  .page-about .about-hero-img {
    width: 300px;
    height: 300px;
  }

  .page-about .about-features-grid {
    gap: 1.5rem;
  }

  .page-about .about-timeline-item {
    padding-bottom: 2.5rem;
  }

  .page-about .about-contact-frame {
    padding: 3rem 2.5rem;
  }
}

/* ============================================
   桌面端宽屏（≥1400px）
   ============================================ */
@media (min-width: 1400px) {
  .page-about .about-hero-title {
    font-size: 5.5rem;
  }

  .page-about .about-hero-frame {
    margin: 0 4rem;
    padding: 3.5rem 3rem;
  }
}
```