* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #f8fafc; display: flex; justify-content: center; align-items: center; min-height: 100vh; color: #334155; }
.container { background: white; border-radius: 12px; padding: 2rem; max-width: 420px; width: 90%; box-shadow: 0 1px 3px rgba(0,0,0,0.1); text-align: center; }
h1 { font-size: 1.25rem; margin-bottom: 0.5rem; }
p { color: #64748b; margin-bottom: 1rem; line-height: 1.5; }
.spinner { border: 3px solid #e2e8f0; border-top: 3px solid #6366f1; border-radius: 50%; width: 32px; height: 32px; animation: spin 0.8s linear infinite; margin: 1rem auto; }
@keyframes spin { to { transform: rotate(360deg); } }
.success { color: #16a34a; }
.error { color: #dc2626; }
.btn { display: inline-block; background: #6366f1; color: white; padding: 0.75rem 1.5rem; border-radius: 8px; text-decoration: none; font-weight: 500; margin-top: 1rem; }
.btn:hover { background: #4f46e5; }
.hidden { display: none; }