:root{font-family:Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:#f6f7fb;color:#111827}a{color:#2563eb;text-decoration:none}.container{max-width:1100px;margin:0 auto;padding:24px}.nav{background:#111827;color:#fff;padding:14px 24px;display:flex;justify-content:space-between;align-items:center}.nav-links{display:flex;gap:16px}.nav-links a{color:#fff}.card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:16px;margin-bottom:16px}.btn{display:inline-block;padding:10px 14px;border-radius:8px;border:none;background:#2563eb;color:#fff;cursor:pointer;font-size:14px}.btn-secondary{background:#4b5563}.btn-danger{background:#b91c1c}.grid{display:grid;gap:16px}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}label{display:block;font-size:14px;margin-bottom:6px}input,select,textarea{width:100%;padding:10px;border-radius:8px;border:1px solid #d1d5db}table{width:100%;border-collapse:collapse}th,td{padding:10px;border-bottom:1px solid #e5e7eb;text-align:left;vertical-align:top}.success{background:#dcfce7;color:#166534;padding:10px;border-radius:8px;margin-bottom:10px}.error{background:#fee2e2;color:#991b1b;padding:10px;border-radius:8px;margin-bottom:10px}.muted{color:#6b7280;font-size:14px}@media (max-width: 900px){.grid-3{grid-template-columns:1fr}}