*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--blue: #1a56db;--blue-light: #ebf5ff;--blue-dark: #1e40af;--green: #057a55;--green-light: #def7ec;--red: #c81e1e;--red-light: #fde8e8;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-400: #9ca3af;--gray-600: #4b5563;--gray-700: #374151;--gray-900: #111827;--shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);--radius: 8px}html,body,#root{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px;color:var(--gray-900);background:var(--gray-50)}.app{display:flex;flex-direction:column;min-height:100vh}header{background:#fff;border-bottom:1px solid var(--gray-200);padding:0 24px;height:56px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow)}header h1{font-size:18px;font-weight:700;color:var(--blue)}header p{font-size:13px;color:var(--gray-600)}.main{flex:1;padding:24px 16px;max-width:960px;margin:0 auto;width:100%}.steps{display:flex;gap:0;margin-bottom:28px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--gray-200);background:#fff}.step{flex:1;padding:12px 8px;text-align:center;font-size:13px;color:var(--gray-400);border-right:1px solid var(--gray-200);position:relative}.step:last-child{border-right:none}.step.active{color:var(--blue);font-weight:600;background:var(--blue-light)}.step.done{color:var(--green);background:var(--green-light)}.step-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:50%;background:var(--gray-200);color:var(--gray-600);font-size:12px;font-weight:700;margin-right:6px}.step.active .step-num{background:var(--blue);color:#fff}.step.done .step-num{background:var(--green);color:#fff}.card{background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}.card h2{font-size:20px;font-weight:700;margin-bottom:6px}.card .subtitle{color:var(--gray-600);font-size:14px;margin-bottom:24px}.form-group{margin-bottom:18px}label{display:block;font-size:13px;font-weight:600;color:var(--gray-700);margin-bottom:6px}input[type=text],input[type=password]{width:100%;padding:10px 12px;border:1px solid var(--gray-200);border-radius:var(--radius);font-size:15px;outline:none;transition:border-color .15s}input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #1a56db1a}.file-input-wrapper{border:2px dashed var(--gray-200);border-radius:var(--radius);padding:24px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s}.file-input-wrapper:hover,.file-input-wrapper.drag{border-color:var(--blue);background:var(--blue-light)}.file-input-wrapper input{display:none}.file-input-wrapper .icon{font-size:32px;margin-bottom:8px}.file-input-wrapper p{color:var(--gray-600);font-size:14px}.file-input-wrapper strong{color:var(--blue)}.file-selected{color:var(--green);font-weight:600;margin-top:8px;font-size:14px}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius);font-size:15px;font-weight:600;border:none;cursor:pointer;transition:opacity .15s,transform .1s}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover:not(:disabled){background:var(--blue-dark)}.btn-success{background:var(--green);color:#fff}.btn-outline{background:#fff;color:var(--gray-700);border:1px solid var(--gray-200)}.btn-outline:hover:not(:disabled){background:var(--gray-100)}.btn-lg{padding:14px 28px;font-size:16px}.btn-full{width:100%;justify-content:center}.alert{padding:12px 16px;border-radius:var(--radius);font-size:14px;margin-bottom:16px}.alert-error{background:var(--red-light);color:var(--red);border:1px solid #fca5a5}.alert-warn{background:#fffbeb;color:#92400e;border:1px solid #fde68a}.alert-success{background:var(--green-light);color:var(--green);border:1px solid #6ee7b7}.alert-info{background:var(--blue-light);color:var(--blue-dark);border:1px solid #93c5fd}.identity{display:flex;align-items:center;gap:14px;padding:16px;background:var(--green-light);border:1px solid #6ee7b7;border-radius:var(--radius);margin-bottom:20px}.identity-avatar{width:48px;height:48px;border-radius:50%;background:var(--green);display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;flex-shrink:0}.identity-name{font-size:16px;font-weight:700;color:var(--green)}.identity-detail{font-size:13px;color:var(--gray-600);margin-top:2px}.viewer-container{display:flex;flex-direction:column;gap:16px}.viewer-toolbar{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#fff;border:1px solid var(--gray-200);border-radius:var(--radius);flex-wrap:wrap}.viewer-toolbar span{font-size:14px;color:var(--gray-600)}.canvas-wrapper{position:relative;overflow:auto;border:1px solid var(--gray-200);border-radius:var(--radius);background:#525659;display:flex;justify-content:center;padding:16px;max-height:65vh;cursor:crosshair}.canvas-wrapper.placing{cursor:crosshair}.canvas-wrapper canvas{display:block;box-shadow:0 4px 20px #0006}.sig-overlay{position:absolute;border:2px solid var(--blue);background:#1a56db1f;border-radius:4px;pointer-events:none;display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--blue-dark);font-weight:600;text-align:center;padding:4px}.loader{display:inline-block;width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}.loader-dark{border-color:#1a56db33;border-top-color:var(--blue)}@keyframes spin{to{transform:rotate(360deg)}}.download-card{text-align:center;padding:48px 32px}.download-icon{font-size:64px;margin-bottom:16px}.download-card h2{font-size:24px;margin-bottom:8px}.download-card p{color:var(--gray-600);margin-bottom:32px}@media (max-width: 600px){.main{padding:12px 8px}.card{padding:18px 14px}.steps .step{font-size:11px;padding:10px 4px}.canvas-wrapper{max-height:55vh;padding:8px}header h1{font-size:16px}}