:root {
  --b4-brand: #0d6efd;
  --b4-brand-dark: #0a58ca;
  --b4-accent: #20c997;
  --b4-hero-gradient: linear-gradient(135deg, #0d6efd 0%, #6610f2 45%, #20c997 100%);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-b4 {
  background: var(--b4-hero-gradient);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero-b4::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.18), transparent 45%),
    radial-gradient(circle at 80% 60%, rgba(255, 255, 255, 0.12), transparent 40%);
  pointer-events: none;
}

.hero-b4 .container {
  position: relative;
  z-index: 1;
}

.feature-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 0.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  background: rgba(13, 110, 253, 0.1);
  color: var(--b4-brand);
}

footer {
  background-color: #f8f9fa;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.doc-link-banner {
  background: #e7f1ff;
  border-left: 4px solid var(--b4-brand);
}