:root {
  --bg-deepest: #020b17;
  --accent:         #1E88E5;
  --accent-glow:    rgba(30,136,229,0.35);
  --text-primary:   #fff;
  --text-secondary: rgba(255,255,255,0.55);
  --radius-sm: 6px;
}
.nf-page {
  background: var(--bg-deepest);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
}
.nf-icon {
  width: 60px; height: 60px; border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.5rem;
}
.nf-h1 {
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  letter-spacing: -0.02em;
}
.nf-p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2rem;
  max-width: 380px;
  margin-left: auto;
  margin-right: auto;
}
.nf-back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--accent);
  color: #fff !important;
  font-weight: 700;
  font-size: 0.88rem;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  transition: background 0.2s, transform 0.15s;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.nf-back:hover { background: #1976d2; transform: translateY(-1px); }