:root{--primary:#3b82f6;--bg:#f3f4f6;--card:#fff;--text:#1f2937}body{background-color:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,sans-serif;margin:0}.test-container{margin:2rem auto;max-width:600px;padding:0 1rem}header{margin-bottom:2rem;text-align:center}header h1{color:var(--primary);margin:0}.card{background:var(--card);border-radius:1rem;box-shadow:0 4px 6px -1px #0000001a;margin-bottom:2rem;padding:1.5rem}.input-group{margin-bottom:1rem}.input-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.5rem}.input-group input,.input-group select{border:1px solid #d1d5db;border-radius:.5rem;box-sizing:border-box;padding:.75rem;width:100%}.row{display:flex;gap:1rem}.row .input-group{flex:1}.btn-refresh{background:var(--primary);border:none;border-radius:.5rem;color:#fff;cursor:pointer;font-weight:600;padding:.75rem;transition:opacity .2s;width:100%}.btn-refresh:hover{opacity:.9}.payment-section{display:flex;flex-direction:column;gap:1.5rem}.button-wrapper{background:#fff;border-radius:1rem;padding:1rem;text-align:center}.button-wrapper h4{color:#6b7280;font-size:.875rem;letter-spacing:.05em;margin-bottom:1rem;margin-top:0;text-transform:uppercase}.result-card{background:#065f46;border-radius:.5rem;color:#d1fae5;margin-top:2rem;overflow-x:auto;padding:1rem}.result-card pre{font-size:.75rem;margin:0 0 1rem}.btn-process{background:#10b981;border:none;border-radius:.5rem;color:#fff;cursor:pointer;font-weight:600;padding:.75rem;width:100%}.backend-card{background:#1f2937;border-radius:1rem;color:#10b981;margin-top:1.5rem;padding:1.5rem}.backend-card h4{color:#fff;margin-top:0}.error-msg{background:#fee2e2;border-radius:.5rem;color:#b91c1c;font-size:.875rem;margin-top:1rem;padding:1rem}