:root {
  --jk-blue: #0050b8;
  --jk-blue-dark: #002b66;
  --jk-accent: #00b8ff;
  --jk-bg-dark: #101623;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #0f172a;
  background: #ffffff;
}

/* Top nav */
.navbar {
  background: linear-gradient(90deg, var(--jk-bg-dark), #000814);
}

/* Hero (index) */
.hero-section {
  padding-top: 96px;
  padding-bottom: 72px;
  background: radial-gradient(circle at top left, #163a7a 0, #020817 55%, #000 100%);
}

.hero-card {
  border-radius: 1rem;
  background: rgba(6, 17, 40, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* Common helpers */
.text-accent { color: var(--jk-accent) !important; }
.bg-accent-subtle { background-color: rgba(0, 184, 255, 0.12) !important; }

.section-title { font-weight: 700; }

.info-box {
  border-radius: 0.9rem;
  padding: 1rem 1.25rem;
  background: #ffffff;
  border: 1px solid #e3e6f0;
}

.product-card {
  border-radius: 0.9rem;
  border: 1px solid #e1e5f2;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  background: #fff;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 30px rgba(15, 23, 42, 0.22);
  border-color: var(--jk-accent);
}

.advantage-box {
  border-radius: 0.9rem;
  padding: 1.5rem;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.advantage-box h5 { color: #e5e7eb; }

.btn-accent {
  background-color: var(--jk-blue);
  border-color: var(--jk-blue);
  color: #fff;
}

.btn-accent:hover {
  background-color: var(--jk-blue-dark);
  border-color: var(--jk-blue-dark);
}

/* Keep pages from feeling short */
main { min-height: 60vh; }

small { font-size: 0.85rem; }

/* Logo on index/about */
.about-logo {
  width: 720px;
  max-width: 100%;
  height: auto;
  display: block;
}






/* ===== About logo card (centered) ===== */
.logo-card{
  background:#fff;
  border:1px solid #e3e6f0;
  border-radius: 1rem;
  padding: 1.25rem;
  box-shadow: 0 14px 30px rgba(15,23,42,.12);
}

/* 让 logo 看起来更“居中”和不撑爆 */
.about-logo{
  width: 720px;
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* ===== Scroll reveal animation ===== */
.reveal{
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s ease, transform .6s ease;
  will-change: opacity, transform;
}
.reveal.is-visible{
  opacity: 1;
  transform: none;
}

/* 尊重无动画用户偏好 */
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity: 1; transform: none; transition: none; }
}