html, body { overflow-x: hidden; width: 100%; max-width: 100vw; }
::selection { background: rgba(20, 184, 166, 0.25); color: white; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.3s ease-out; }
.spin {
  display: inline-block; width: 14px; height: 14px;
  border: 2px solid rgba(0,0,0,0.2); border-top-color: #000;
  border-radius: 50%; animation: spin 0.6s linear infinite;
  margin-right: 6px; vertical-align: middle;
}
.spin-dark { border-color: rgba(0,0,0,0.15); border-top-color: #000; }