.page-about {
  padding: 1.5rem 1rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

/* ── 面包屑 ── */
.page-about .breadcrumb {
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}
.page-about .breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover {
  color: var(--accent-green);
}
.page-about .breadcrumb-sep {
  margin: 0 0.4rem;
  opacity: 0.5;
}
.page-about .breadcrumb-current {
  color: var(--accent-green);
}

/* ── 首屏封面 ── */
.page-about .about-hero {
  position: relative;
  margin-bottom: 3rem;
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--glass-light);
}
.page-about .about-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .about-hero-text h1 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.8rem;
  color: var(--text-primary);
  line-height: 1.2;
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
}
.page-about .about-hero-subtitle {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
  max-width: 540px;
}
.page-about .about-hero-visual {
  position: relative;
}
.page-about .about-hero-frame {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--glass-light);
  background: var(--bg-secondary);
}
.page-about .about-hero-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 800 / 500;
}
.page-about .about-hero-svg {
  display: none;
}
.page-about .about-hero-badge {
  position: absolute;
  top: 1.2rem;
  right: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  background: var(--glass-medium);
  backdrop-filter: blur(8px);
  border-radius: 20px;
  border: 1px solid var(--glass-light);
  font-size: 0.75rem;
  color: var(--accent-green);
}
.page-about .about-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: aboutPulse 1.8s ease-in-out infinite;
}
@keyframes aboutPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.page-about .about-badge-text {
  letter-spacing: 0.05em;
}

/* ── 理念卡片 ── */
.page-about .about-cards {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
  margin-bottom: 3rem;
}
.page-about .about-card {
  position: relative;
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 1.5rem 1.2rem;
  border: 1px solid var(--glass-light);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  opacity: 0;
  transform: translateY(28px);
  animation: aboutCardFadeIn 0.55s ease forwards;
}
.page-about .about-card:nth-child(1) {
  animation-delay: 0.1s;
}
.page-about .about-card:nth-child(2) {
  animation-delay: 0.25s;
}
.page-about .about-card:nth-child(3) {
  animation-delay: 0.4s;
}
@keyframes aboutCardFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.page-about .about-card:hover {
  border-color: var(--glass-medium);
  box-shadow: 0 6px 28px rgba(57, 255, 20, 0.07);
  transform: translateY(-3px);
}
.page-about .about-card-label {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--accent-blue);
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--glass-light);
  border-radius: 4px;
  background: rgba(0, 191, 255, 0.06);
}
.page-about .about-card-body {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.page-about .about-card-text h2 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--accent-green);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}
.page-about .about-card-text p {
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}
.page-about .about-card-media {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-tertiary);
}
.page-about .about-card-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 10px;
}
.page-about .about-card-icon-svg {
  display: none;
}
.page-about .about-card-chart {
  background: var(--bg-tertiary);
  border-radius: 10px;
  padding: 0.8rem;
  border: 1px solid var(--glass-light);
}
.page-about .about-chart-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 100px;
}

/* ── 内链区域 ── */
.page-about .about-connect {
  padding-top: 2rem;
  border-top: 1px solid var(--glass-light);
}
.page-about .about-connect-heading {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  color: var(--text-primary);
}
.page-about .about-connect-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .about-connect-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.2rem;
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--glass-light);
  text-decoration: none;
  transition: all 0.3s;
  color: var(--text-primary);
}
.page-about .about-connect-card:hover {
  border-color: var(--accent-green);
  background: var(--bg-tertiary);
  transform: translateX(4px);
}
.page-about .about-connect-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  opacity: 0.8;
}
.page-about .about-connect-label {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-primary);
}
.page-about .about-connect-desc {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--neutral-gray);
  letter-spacing: 0.03em;
}

/* ── 桌面端 ≥768px ── */
@media (min-width: 768px) {
  .page-about {
    padding: 2rem 2rem 4rem;
  }
  .page-about .breadcrumb {
    margin-bottom: 2rem;
    font-size: 0.85rem;
  }
  .page-about .about-hero {
    margin-bottom: 4rem;
    padding: 2.5rem 0 2rem;
  }
  .page-about .about-hero-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about .about-hero-text {
    flex: 1 1 45%;
  }
  .page-about .about-hero-text h1 {
    font-size: 2.2rem;
  }
  .page-about .about-hero-subtitle {
    font-size: 1rem;
  }
  .page-about .about-hero-visual {
    flex: 1 1 55%;
  }
  .page-about .about-hero-svg {
    display: block;
    position: absolute;
    bottom: -24px;
    left: 0;
    width: 100%;
    height: 60px;
    pointer-events: none;
  }
  .page-about .about-hero-badge {
    top: 1.8rem;
    right: 1rem;
    padding: 0.35rem 1rem;
    font-size: 0.8rem;
  }

  /* 卡片错位 */
  .page-about .about-cards {
    gap: 2.5rem;
  }
  .page-about .about-card {
    padding: 2rem 2rem;
    margin-left: 0;
    margin-right: 0;
  }
  .page-about .about-card:nth-child(odd) {
    margin-right: 2rem;
  }
  .page-about .about-card:nth-child(even) {
    margin-left: 2rem;
  }
  .page-about .about-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(57, 255, 20, 0.08);
  }

  .page-about .about-card-body {
    flex-direction: row;
    align-items: center;
    gap: 2rem;
  }
  .page-about .about-card-speed .about-card-body {
    flex-direction: row;
  }
  .page-about .about-card-pure .about-card-body {
    flex-direction: row-reverse;
  }
  .page-about .about-card-data .about-card-body {
    flex-direction: column;
  }

  .page-about .about-card-text {
    flex: 1 1 50%;
  }
  .page-about .about-card-text h2 {
    font-size: 1.5rem;
  }
  .page-about .about-card-text p {
    font-size: 0.96rem;
  }
  .page-about .about-card-media {
    flex: 1 1 45%;
    max-width: 400px;
  }
  .page-about .about-card-icon-svg {
    display: block;
    position: absolute;
    top: -10px;
    right: -10px;
    width: 56px;
    height: 56px;
    opacity: 0.3;
    pointer-events: none;
  }
  .page-about .about-card-chart {
    flex: 0 0 auto;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
  }
  .page-about .about-chart-svg {
    max-height: 110px;
  }

  /* 内链网格 */
  .page-about .about-connect-grid {
    flex-direction: row;
    justify-content: center;
    gap: 1.5rem;
  }
  .page-about .about-connect-card {
    flex: 0 1 260px;
    flex-direction: column;
    text-align: center;
    padding: 1.8rem 1.2rem;
  }
  .page-about .about-connect-card:hover {
    transform: translateY(-4px);
  }
  .page-about .about-connect-desc {
    margin-left: 0;
  }
}

/* ── 大桌面端 ≥1024px ── */
@media (min-width: 1024px) {
  .page-about {
    padding: 2.5rem 2.5rem 5rem;
  }
  .page-about .about-hero-text h1 {
    font-size: 2.8rem;
  }
  .page-about .about-hero-subtitle {
    font-size: 1.1rem;
  }
  .page-about .about-hero-svg {
    bottom: -28px;
    height: 80px;
  }
  .page-about .about-card {
    padding: 2.5rem 2.8rem;
  }
  .page-about .about-card:nth-child(odd) {
    margin-right: 4rem;
  }
  .page-about .about-card:nth-child(even) {
    margin-left: 4rem;
  }
  .page-about .about-card-text h2 {
    font-size: 1.7rem;
  }
  .page-about .about-card-text p {
    font-size: 1rem;
  }
  .page-about .about-card-media {
    max-width: 360px;
  }
  .page-about .about-connect-card {
    flex: 0 1 280px;
    padding: 2rem 1.5rem;
  }
}