:root{--primary-color: #3b82f6;--primary-hover: #2563eb;--border-color: #e5e7eb;--bg-color: #f9fafb;--text-color: #1f2937;--shadow: 0 1px 3px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-color);color:var(--text-color)}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:#fff;padding:1rem;text-align:center;border-bottom:1px solid var(--border-color);box-shadow:var(--shadow)}.app-header h1{font-size:1.5rem;color:var(--primary-color);margin-bottom:.25rem}.app-header p{color:#6b7280;font-size:.9rem;margin-bottom:.25rem}.app-container{display:flex;flex:1;gap:2rem;padding:2rem;max-width:1800px;margin:0 auto;width:100%;min-height:calc(100vh - 120px);height:calc(100vh - 120px)}.control-panel{width:350px;background:#fff;border-radius:12px;padding:1.5rem;box-shadow:var(--shadow);height:100%;overflow-y:auto}.panel-section{margin-bottom:2rem}.panel-section:last-child{margin-bottom:0}.panel-section h3{font-size:1.125rem;margin-bottom:1rem;color:var(--text-color);font-weight:600}.paper-type-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem}.type-btn{padding:.75rem 1rem;border:2px solid var(--border-color);background:#fff;border-radius:8px;cursor:pointer;transition:all .2s;font-size:.875rem;font-weight:500}.type-btn:hover{border-color:var(--primary-color);background:#eff6ff}.type-btn.active{border-color:var(--primary-color);background:var(--primary-color);color:#fff}.form-group{margin-bottom:1.25rem}.form-group label{display:block;margin-bottom:.5rem;font-size:.875rem;font-weight:500;color:var(--text-color)}.form-group select,.form-group input[type=color]{width:100%;padding:.5rem;border:1px solid var(--border-color);border-radius:6px;font-size:.875rem}.form-group input[type=range]{width:100%;margin-top:.25rem}.form-group input[type=checkbox]{width:auto;margin-right:.5rem}.color-picker-group{display:flex;flex-direction:column;gap:.5rem}.color-presets{display:flex;gap:.5rem;flex-wrap:wrap}.color-preset{width:30px;height:30px;border:2px solid var(--border-color);border-radius:4px;cursor:pointer;transition:all .2s;padding:0}.color-preset:hover{transform:scale(1.1);box-shadow:0 2px 4px #0003}.color-preset.active{border-color:var(--primary-color);border-width:3px;box-shadow:0 0 0 2px #3b82f633}.radio-group{display:flex;gap:1rem}.radio-group label{display:flex;align-items:center;gap:.5rem;font-weight:400;margin-bottom:0}.config-btn{padding:.75rem 1.25rem;border:none;border-radius:6px;cursor:pointer;font-size:.875rem;font-weight:600;transition:all 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h3{font-size:1.125rem;font-weight:600}.preview-info{color:#6b7280;font-size:.875rem}.canvas-container{flex:1;display:flex;align-items:center;justify-content:center;background:#f3f4f6;border-radius:8px;padding:2rem;overflow:auto}.canvas-container canvas{max-width:100%;max-height:100%;box-shadow:0 4px 6px #0000001a;background:#fff}@media(max-width:1024px){.app-container{flex-direction:column;height:auto;min-height:auto}.control-panel{width:100%;max-height:none;height:auto}.preview-area{min-height:500px}}.app-footer{background:#fff;border-top:1px solid var(--border-color);padding:1rem;margin-top:auto}.footer-content{display:flex;flex-direction:column;align-items:center;text-align:center;gap:.5rem;font-size:.875rem;color:#6b7280}.footer-info,.footer-contact,.footer-copyright{margin:0}.footer-contact a:hover{text-decoration:underline}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:#fff;border-radius:12px;padding:2rem;max-width:500px;width:90%;box-shadow:0 10px 25px #0003;text-align:center;position:relative}.modal-close-btn{position:absolute;top:12px;right:12px;background:none;border:none;font-size:1.5rem;color:#6b7280;cursor:pointer;width:30px;height:30px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all .2s}.modal-close-btn:hover{background:#f3f4f6;color:#374151}.modal-content h2{margin-bottom:1rem;color:#3b82f6}.modal-content p{margin-bottom:1.5rem;line-height:1.6;color:#374151}.modal-buttons{display:flex;gap:1rem;justify-content:center}.modal-btn{padding:.75rem 1.5rem;border:none;border-radius:6px;cursor:pointer;font-weight:600;transition:all 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