@keyframes shell-spin { to { transform: rotate(360deg) } }
.shell-loader {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: #F8FAFC; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
.shell-loader__inner { text-align: center; }
.shell-loader__title { font-size: 1.5rem; font-weight: 700; color: #0F172A; margin: 0 0 0.25rem; }
.shell-loader__sub { font-size: 0.875rem; color: #64748B; margin: 0 0 1rem; }
.shell-loader__ring {
  width: 2.5rem; height: 2.5rem; margin: 0 auto;
  border: 4px solid #116E31; border-top-color: transparent;
  border-radius: 50%; animation: shell-spin 0.8s linear infinite;
}