:root{--primary-color:#1a73e8;--secondary-color:#f5f5f5;--accent-color:#e74c3c;--background-color:#ffffff;--text-color:#333333;--border-color:#bdc3c7;--error-color:#ff4d4f;--primary-color-toolbar-button:green;--shadow-color:rgba(0,0,0,0.1);--transition-speed:0.3s;--font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}*{box-sizing:border-box}body,html{margin:0;padding:0;font-family:var(--font-family);background-color:var(--secondary-color);height:auto;min-height:100vh;overflow-x:hidden;overflow-y:auto}html{scroll-behavior:smooth}.main-container{display:grid;grid-template-columns:25% 1fr;grid-template-rows:1fr auto;grid-template-areas:"intro intro" "sidebar main" "footer footer";gap:20px;width:100%;height:auto;min-height:80vh;padding:20px;position:relative}.left-panel{grid-area:header;background-color:var(--background-color);box-shadow:0 2px 6px var(--shadow-color);border-radius:8px;padding:10px;height:auto}.right-panel{grid-area:sidebar;background-color:var(--background-color);box-shadow:2px 0 6px var(--shadow-color);border-radius:8px;padding:20px;height:750px;overflow-y:auto;box-sizing:border-box}.center-panel{grid-area:main;display:flex;justify-content:center;align-items:center;padding:0;overflow:hidden}#toolbar{background-color:transparent;box-shadow:none;padding:0;margin-bottom:0;color:var(--text-color);display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;gap:15px}#toolbar .toolbar-group{display:flex;align-items:center;gap:8px}#toolbar button,#toolbar input,#toolbar select{margin:0}.add-section label{margin-top:0;margin-bottom:0}#canvas{position:absolute;top:0;left:0;width:100% !important;height:100% !important;display:block;touch-action:none;z-index:1}#sidebar h2.Properties{cursor:default;font-weight:700;background-color:var(--primary-color);height:40px;line-height:40px;border:none;border-radius:8px;margin-bottom:20px;text-align:center;padding:0;font-size:18px;color:white;box-shadow:0 2px 4px var(--shadow-color)}.model-section-header{font-size:1.2rem;color:var(--primary-color);text-align:left;margin:20px 0 10px;padding:10px 15px;background:linear-gradient(90deg,#e3f2fd,#ffffff);border-radius:6px;font-weight:bold;box-shadow:0px 2px 5px var(--shadow-color);border-left:5px solid var(--primary-color)}.model-item{display:flex;flex-direction:column;background-color:var(--background-color);border:1px solid var(--border-color);margin-bottom:10px;border-radius:8px;cursor:pointer;transition:background-color var(--transition-speed),box-shadow var(--transition-speed);width:100%;box-shadow:0 2px 4px var(--shadow-color)}.model-item:hover{background-color:#f0f8ff;box-shadow:0 4px 8px var(--shadow-color)}.model-item-header{display:flex;align-items:center;padding:12px 16px;background-color:var(--background-color);position:relative;border-radius:8px}.property-icon{width:24px;height:24px;margin-right:5px}.property-icon-container{display:inline-block;vertical-align:middle;margin-right:0px}.model-item-header span{flex-grow:1;font-size:16px;color:var(--text-color)}.delete-icon{color:var(--accent-color);font-size:18px;cursor:pointer;transition:color var(--transition-speed),transform var(--transition-speed);position:absolute;right:12px;top:50%;transform:translateY(-50%)}.delete-icon:hover{color:#c0392b;transform:translateY(-50%) scale(1.2)}.accordion-content{padding:16px;background-color:#f9f9f9;border-top:1px solid var(--border-color);border-bottom-left-radius:8px;border-bottom-right-radius:8px;box-sizing:border-box;animation:fadeIn var(--transition-speed) ease-in-out;max-height:10000px !important}@keyframes fadeIn{from{opacity:0}to{opacity:1}}.form-group{margin-bottom:15px}.form-group label{display:block;font-weight:600;margin-bottom:6px;color:var(--text-color)}.form-group input,.form-group select{width:100%;padding:8px 12px;border:1px solid var(--border-color);border-radius:4px;font-size:14px;transition:border-color var(--transition-speed),box-shadow var(--transition-speed)}.form-group input:focus,.form-group select:focus{border-color:var(--primary-color);box-shadow:0 0 5px rgba(26,115,232,0.5);outline:none}.accordion-content button{padding:10px 16px;background-color:var(--primary-color);border:none;color:white;cursor:pointer;border-radius:4px;font-size:14px;transition:background-color var(--transition-speed);margin-right:10px}.accordion-content button:hover{background-color:#1558b0}.tabs{display:flex;border-bottom:2px solid var(--border-color);margin-bottom:20px;flex-wrap:wrap}.tab-label{padding:10px 20px;cursor:pointer;background-color:#f1f1f1;border:1px solid var(--border-color);border-bottom:none;border-radius:5px 5px 0 0;margin-right:5px;transition:background-color var(--transition-speed);font-weight:bold;white-space:nowrap}.tab-label:hover{background-color:#ddd}.tabs input[type="radio"]{display:none}.tabs input[type="radio"]:checked + .tab-label{background-color:#ffffff;border-bottom:2px solid #ffffff;color:var(--primary-color)}.tab-content{width:100%}.tab-content .tab-panel{display:none}.tabs input[type="radio"]:checked ~ .tab-content .tab-panel{display:block}.add-section form{max-width:100%;box-sizing:border-box;overflow-x:hidden}.form-group input,.form-group select{width:100%;box-sizing:border-box}form button{display:inline-block;margin:5px 10px 5px 0;padding:8px 16px;font-size:14px;border-radius:5px;border:none;cursor:pointer;transition:background-color 0.3s ease}form button:hover{opacity:0.9}form .close-button{background-color:#e74c3c !important;color:white}form .close-button:hover{background-color:#c0392b !important}form button[type="button"]:not(.close-button){background-color:#1abc9c;color:white;font-size:12px}form button[type="button"]:not(.close-button):hover{background-color:#16a085}.form-buttons{display:flex;justify-content:flex-start;gap:10px;margin-top:10px;flex-wrap:wrap}.tab-label{flex:0 1 auto}@media (max-width:600px){.tabs{flex-direction:column}.tab-label{margin-right:0;margin-bottom:5px;border-radius:5px}.tab-content .tab-panel{padding-top:10px}}.error-message{color:var(--error-color);font-size:14px;font-weight:500;margin-top:8px;border-left:3px solid var(--error-color);padding:8px;background-color:#fff1f0;border-radius:4px;box-shadow:0 1px 3px var(--shadow-color);opacity:0;visibility:hidden;transition:opacity var(--transition-speed) ease,visibility var(--transition-speed) ease;margin-bottom:10px}.error-message:not(:empty){opacity:1;visibility:visible}.add-section{background-color:var(--background-color);border:1px solid 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rgba(26,115,232,0.5);outline:none}.add-section button{padding:10px 20px;background-color:var(--primary-color);border:none;color:white;cursor:pointer;border-radius:4px;font-size:12px;transition:background-color var(--transition-speed)}.add-section button:hover{background-color:#1558b0}.method-selection{margin-bottom:20px}.method-selection label{margin-right:15px;font-weight:500;font-size:14px;color:var(--text-color);display:flex;align-items:center}.method-selection input{margin-right:8px;width:16px;height:16px;cursor:pointer}@media (max-width:1024px){#canvas-container{flex-direction:column;align-items:center}#canvas{width:100%;max-width:800px;height:auto;aspect-ratio:4 / 3;touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}#sidebar{width:100%;margin-left:0;margin-top:20px;height:auto}}@media (max-width:768px){.main-container{display:flex;flex-direction:column;padding:10px;gap:15px;height:auto;min-height:100vh}.left-panel{width:100% 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8px;border-radius:4px;font-weight:bold;transition:background-color 0.2s,color 0.2s}.pending-shape-delete:hover{background-color:#ffeaea;color:#c0392b}@media (max-width:768px){.canvas-overlay-top-left{top:8px;left:8px;gap:5px;max-width:60%;flex-wrap:wrap}.overlay-button{padding:6px 10px;font-size:12px}.canvas-overlay-top-right{top:8px;right:8px;padding:6px 8px;gap:4px;background-color:rgba(255,255,255,0.9)}.canvas-overlay-top-right .toolbar-group{gap:5px}.canvas-overlay-top-right label{font-size:11px;letter-spacing:-0.3px}.canvas-overlay-top-right input{width:40px;padding:2px 4px;font-size:12px;height:24px}}