:root{--primary-color: #3ecf8e;--primary-hover: #34b27b;--bg-main: #f9fafb;--surface-card: #ffffff;--border-subtle: #e5e7eb;--border-strong: #d1d5db;--text-main: #111827;--text-muted: #6b7280;--text-on-primary: #ffffff;--radius-lg: 6px;--radius-md: 4px;--radius-sm: 2px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--font-sans: "Inter", system-ui, -apple-system, sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-sans);background:var(--bg-main);color:var(--text-main);-webkit-font-smoothing:antialiased;min-height:100vh}button{font-family:inherit}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{padding:1rem 3rem;display:flex;justify-content:space-between;align-items:center;background:#fff;border-bottom:1px solid var(--border-subtle);position:sticky;top:0;z-index:100}.app-header h1{font-size:1.25rem;font-weight:600;letter-spacing:-.01em;color:var(--text-main);display:flex;align-items:center;gap:.75rem}.app-main{flex:1;padding:3rem;width:100%;max-width:1200px;margin:0 auto}.pdf-uploader{display:flex;flex-direction:column;align-items:center;gap:2rem}.upload-zone{width:100%;max-width:800px;min-height:400px;background:#fff;border:1px dashed var(--border-strong);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease}.upload-zone:hover,.upload-zone.active{border-color:var(--primary-color);background:#fdfdfd}.upload-label{display:flex;flex-direction:column;align-items:center;gap:1.5rem;padding:2rem}.upload-icon{font-size:3.5rem}.upload-label h2{font-size:1.5rem;font-weight:600;color:var(--text-main)}.upload-label p{color:var(--text-muted);font-size:1rem}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;width:100%;max-width:1000px;margin-top:2rem}.feature{padding:1.5rem;background:#fff;border:1px solid var(--border-subtle);border-radius:var(--radius-lg);text-align:center;font-size:.875rem;color:var(--text-muted)}.btn-primary,.btn-secondary{padding:.625rem 1.25rem;border-radius:var(--radius-lg);font-weight:500;font-size:.875rem;cursor:pointer;transition:all .2s ease;border:1px solid transparent;display:flex;align-items:center;justify-content:center;gap:.5rem}.btn-primary{background:var(--primary-color);color:var(--text-on-primary)}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:#fff;color:var(--text-main);border-color:var(--border-strong)}.btn-secondary:hover:not(:disabled){background:#f9fafb;border-color:var(--text-main)}.toolbar{background:#fff;padding:1.5rem;border-radius:var(--radius-lg);display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;border:1px solid var(--border-subtle);flex-wrap:wrap;gap:1.5rem}.tool-group{display:flex;align-items:center;gap:.75rem}.signature-count{font-size:.875rem;color:var(--text-muted)}.pdf-viewer{display:flex;flex-direction:column;gap:1.5rem}.viewer-toolbar{display:flex;justify-content:center;align-items:center;gap:1.5rem;padding:.75rem;background:#fff;border-radius:var(--radius-lg);border:1px solid var(--border-subtle)}.page-info{font-size:.875rem;font-weight:500;color:var(--text-main);min-width:100px;text-align:center}.zoom-controls{display:flex;align-items:center;gap:.5rem;padding-left:1.5rem;border-left:1px solid var(--border-subtle)}.pdf-container{background:#f3f4f6;padding:3rem;border-radius:var(--radius-lg);overflow:auto;display:flex;justify-content:center;align-items:flex-start;min-height:80vh;position:relative;border:1px solid var(--border-subtle)}.pdf-page{position:relative;background:#fff;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;transform-origin:top left;flex-shrink:0}.pdf-page.placing-signature{touch-action:none;cursor:crosshair}.placement-ghost{position:absolute;pointer-events:none;opacity:.5;border:1px dashed var(--primary-color);z-index:200}.placement-ghost img{width:100%;height:100%;object-fit:contain}.placed-signature{position:absolute;border:1px solid transparent;border-radius:4px;z-index:50;transition:background .2s}.placed-signature:hover{background:#3ecf8e0d;border-color:var(--primary-color)}.placed-signature.selected{border:1.5px solid var(--primary-color);background:#3ecf8e0d;z-index:100}.resize-handle{position:absolute;bottom:-4px;right:-4px;width:8px;height:8px;background:#fff;border:1.5px solid var(--primary-color);border-radius:2px;cursor:nwse-resize;z-index:110}.signature-timestamp{position:absolute;bottom:-16px;left:0;font-size:.625rem;color:var(--text-muted);white-space:nowrap;pointer-events:none}.remove-sig-btn{position:absolute;top:-10px;right:-10px;width:20px;height:20px;background:#ef4444;color:#fff;border-radius:50%;border:none;display:flex;align-items:center;justify-content:center;font-size:14px;cursor:pointer;opacity:0;transition:opacity .2s}.placed-signature:hover .remove-sig-btn{opacity:1}.modal-overlay{position:fixed;inset:0;background:#0000004d;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:#fff;width:95%;max-width:500px;border-radius:var(--radius-lg);padding:1.5rem;box-shadow:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a;border:1px solid var(--border-subtle)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.modal-header h2{font-size:1.25rem;font-weight:600;color:var(--text-main)}.close-btn{background:transparent;border:none;color:var(--text-muted);font-size:1.5rem;cursor:pointer;padding:.5rem;line-height:1}.close-btn:hover{color:var(--text-main)}.mode-selector{display:flex;border-bottom:1px solid var(--border-subtle);margin-bottom:1.5rem;gap:1.5rem}.mode-selector button{padding:.75rem .25rem;border:none;background:transparent;font-weight:500;font-size:.875rem;color:var(--text-muted);cursor:pointer;position:relative}.mode-selector button.active{color:var(--primary-color)}.mode-selector button.active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--primary-color)}.signature-draw{border:1px solid var(--border-subtle);border-radius:var(--radius-lg);margin-bottom:1.5rem}.canvas-container{background:#fff;height:200px}.signature-canvas{width:100%;height:100%;touch-action:none}.canvas-actions{padding:.5rem;border-top:1px solid var(--border-subtle);display:flex;justify-content:flex-end}.canvas-actions .btn-secondary{padding:.5rem 1rem;font-size:.8rem;color:#ef4444;background:#fff;border:1px solid #fee2e2;border-radius:var(--radius-md);cursor:pointer}.canvas-actions .btn-secondary:hover{background:#fef2f2}.signature-type{display:flex;flex-direction:column;gap:1.25rem;margin-bottom:2rem}.name-input{width:100%;padding:.75rem 1rem;border:1px solid var(--border-strong);border-radius:var(--radius-lg);font-size:1rem;color:var(--text-main);transition:all .2s ease}.name-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #3ecf8e1a}.font-selector{display:flex;align-items:center;gap:1rem}.font-selector label{font-size:.875rem;color:var(--text-muted);white-space:nowrap}.font-selector select{flex:1;padding:.5rem;border:1px solid var(--border-subtle);border-radius:var(--radius-lg);background:#fff;font-size:.875rem;color:var(--text-main);cursor:pointer}.signature-preview{margin-top:1rem;padding:2rem;background:#fdfdfd;border:1px solid var(--border-subtle);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;min-height:120px}.signature-upload{margin-bottom:2rem}.signature-upload .upload-label{border:1px dashed var(--border-strong);border-radius:var(--radius-lg);padding:2.5rem;cursor:pointer;transition:all .2s ease;background:#fdfdfd}.signature-upload .upload-label:hover{border-color:var(--primary-color);background:#f9fafb}.signature-upload .upload-icon{font-size:2rem;margin-bottom:.5rem}.signature-upload p{font-size:.875rem;font-weight:500;margin-bottom:.25rem}.signature-upload small{font-size:.75rem;color:var(--text-muted)}.timestamp-option{margin-bottom:1.5rem}.timestamp-option label{display:flex;align-items:center;gap:.5rem;font-size:.875rem;color:var(--text-muted);cursor:pointer}.modal-footer{display:flex;justify-content:flex-end;gap:.75rem;margin-top:1.5rem}.modal-footer .btn-primary,.modal-footer .btn-secondary{flex:1}@media(max-width:768px){.app-header{padding:1rem 1.5rem}.app-main{padding:1.5rem}.toolbar{flex-direction:column;align-items:stretch;padding:1rem}.tool-group{flex-direction:column}.viewer-toolbar{flex-direction:column;gap:1rem}.zoom-controls{border:none;padding:0}}