body { font-family: Arial, sans-serif; margin: 2rem; background: #f8fafc; color: #0f172a; }
.container { max-width: 900px; margin: auto; background: white; padding: 1.5rem; border-radius: 12px; box-shadow: 0 1px 4px rgba(0,0,0,0.1); }
h1, h2 { margin-top: 0; }
input, select, button { padding: 0.5rem; margin: 0.2rem 0; }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { border-bottom: 1px solid #e2e8f0; text-align: left; padding: 0.5rem; }
.error { color: #b91c1c; }
.mono { font-family: monospace; font-size: 0.9rem; }
.actions { display: flex; gap: 0.5rem; }