/* ── SVG Icon System ── */
/* Inline SVG icons via CSS background-image for cross-platform consistency */

.icon-svg {
  display: inline-block;
  width: 16px;
  height: 16px;
  vertical-align: middle;
  margin-right: 4px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
}

/* Topbar icons — 18px */
#topbar .icon-svg { width: 18px; height: 18px; margin-right: 3px; }

/* Sizing variants */
.icon-svg.sm { width: 14px; height: 14px; }
.icon-svg.lg { width: 20px; height: 20px; }

/* ── Icon definitions (SVG data URIs) ── */
/* Using currentColor via CSS filter for theme support */

.icon-undo { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 7v6h6'/%3E%3Cpath d='M21 17a9 9 0 0 0-9-9 9 9 0 0 0-6 2.3L3 13'/%3E%3C/svg%3E"); }
.icon-redo { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 7v6h-6'/%3E%3Cpath d='M3 17a9 9 0 0 1 9-9 9 9 0 0 1 6 2.3L21 13'/%3E%3C/svg%3E"); }
.icon-new { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 6h18'/%3E%3Cpath d='M8 6V4h8v2'/%3E%3Cpath d='M5 6v14a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V6'/%3E%3Cline x1='10' y1='11' x2='10' y2='17'/%3E%3Cline x1='14' y1='11' x2='14' y2='17'/%3E%3C/svg%3E"); }
.icon-import { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='17 8 12 3 7 8'/%3E%3Cline x1='12' y1='3' x2='12' y2='15'/%3E%3C/svg%3E"); }
.icon-trophy { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9H4.5a2.5 2.5 0 0 1 0-5H6'/%3E%3Cpath d='M18 9h1.5a2.5 2.5 0 0 0 0-5H18'/%3E%3Cpath d='M4 22h16'/%3E%3Cpath d='M10 14.66V17c0 .55-.47.98-.97 1.21C7.85 18.75 7 20 7 22'/%3E%3Cpath d='M14 14.66V17c0 .55.47.98.97 1.21C16.15 18.75 17 20 17 22'/%3E%3Cpath d='M18 2H6v7a6 6 0 0 0 12 0V2Z'/%3E%3C/svg%3E"); }
.icon-moon { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z'/%3E%3C/svg%3E"); }
.icon-sun { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='5'/%3E%3Cline x1='12' y1='1' x2='12' y2='3'/%3E%3Cline x1='12' y1='21' x2='12' y2='23'/%3E%3Cline x1='4.22' y1='4.22' x2='5.64' y2='5.64'/%3E%3Cline x1='18.36' y1='18.36' x2='19.78' y2='19.78'/%3E%3Cline x1='1' y1='12' x2='3' y2='12'/%3E%3Cline x1='21' y1='12' x2='23' y2='12'/%3E%3Cline x1='4.22' y1='19.78' x2='5.64' y2='18.36'/%3E%3Cline x1='18.36' y1='5.64' x2='19.78' y2='4.22'/%3E%3C/svg%3E"); }
.icon-home { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M15 3h4a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2h-4'/%3E%3Cpolyline points='10 17 15 12 10 7'/%3E%3Cline x1='15' y1='12' x2='3' y2='12'/%3E%3C/svg%3E"); }
.icon-fit { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M8 3H5a2 2 0 0 0-2 2v3'/%3E%3Cpath d='M21 8V5a2 2 0 0 0-2-2h-3'/%3E%3Cpath d='M3 16v3a2 2 0 0 0 2 2h3'/%3E%3Cpath d='M16 21h3a2 2 0 0 0 2-2v-3'/%3E%3C/svg%3E"); }
.icon-printer { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9V2h12v7'/%3E%3Cpath d='M6 18H4a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2h16a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-2'/%3E%3Crect x='6' y='14' width='12' height='8'/%3E%3C/svg%3E"); }
.icon-save { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z'/%3E%3Cpolyline points='17 21 17 13 7 13 7 21'/%3E%3Cpolyline points='7 3 7 8 15 8'/%3E%3C/svg%3E"); }
.icon-export { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='7 10 12 15 17 10'/%3E%3Cline x1='12' y1='15' x2='12' y2='3'/%3E%3C/svg%3E"); }
.icon-camera { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M23 19a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h4l2-3h6l2 3h4a2 2 0 0 1 2 2z'/%3E%3Ccircle cx='12' cy='13' r='4'/%3E%3C/svg%3E"); }

/* ── Left toolbar icons ── */
.icon-select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 3l7.07 16.97 2.51-7.39 7.39-2.51L3 3z'/%3E%3Cpath d='M13 13l6 6'/%3E%3C/svg%3E"); }
.icon-move { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='5 9 2 12 5 15'/%3E%3Cpolyline points='9 5 12 2 15 5'/%3E%3Cpolyline points='15 19 12 22 9 19'/%3E%3Cpolyline points='19 9 22 12 19 15'/%3E%3Cline x1='2' y1='12' x2='22' y2='12'/%3E%3Cline x1='12' y1='2' x2='12' y2='22'/%3E%3C/svg%3E"); }
.icon-rotate { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='23 4 23 10 17 10'/%3E%3Cpath d='M20.49 15a9 9 0 1 1-2.12-9.36L23 10'/%3E%3C/svg%3E"); }
.icon-scale { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='15 3 21 3 21 9'/%3E%3Cpolyline points='9 21 3 21 3 15'/%3E%3Cline x1='21' y1='3' x2='14' y2='10'/%3E%3Cline x1='3' y1='21' x2='10' y2='14'/%3E%3C/svg%3E"); }
.icon-grid { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='7' height='7'/%3E%3Crect x='14' y='3' width='7' height='7'/%3E%3Crect x='14' y='14' width='7' height='7'/%3E%3Crect x='3' y='14' width='7' height='7'/%3E%3C/svg%3E"); }
.icon-pencil { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M17 3a2.85 2.83 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z'/%3E%3C/svg%3E"); }
.icon-copy { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='9' y='9' width='13' height='13' rx='2' ry='2'/%3E%3Cpath d='M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1'/%3E%3C/svg%3E"); }
.icon-group { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='2' y='7' width='8' height='8' rx='1'/%3E%3Crect x='14' y='7' width='8' height='8' rx='1'/%3E%3Cpath d='M10 11h4'/%3E%3C/svg%3E"); }
.icon-ungroup { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='2' y='7' width='8' height='8' rx='1'/%3E%3Crect x='14' y='7' width='8' height='8' rx='1'/%3E%3Cpath d='M10 9l4 4M10 13l4-4'/%3E%3C/svg%3E"); }
.icon-trash { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='3 6 5 6 21 6'/%3E%3Cpath d='M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2'/%3E%3C/svg%3E"); }
.icon-union { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2'%3E%3Ccircle cx='9' cy='12' r='6'/%3E%3Ccircle cx='15' cy='12' r='6'/%3E%3C/svg%3E"); }
.icon-subtract { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='9' cy='12' r='6'/%3E%3Ccircle cx='15' cy='12' r='6' stroke-dasharray='3 3'/%3E%3C/svg%3E"); }
.icon-hollow { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2'%3E%3Crect x='3' y='3' width='18' height='18' rx='2'/%3E%3Crect x='7' y='7' width='10' height='10' rx='1'/%3E%3C/svg%3E"); }
.icon-slice { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Crect x='3' y='4' width='18' height='16' rx='2'/%3E%3Cline x1='12' y1='4' x2='12' y2='20'/%3E%3C/svg%3E"); }
.icon-bend { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M4 20C4 12 12 4 20 4'/%3E%3Cpolyline points='16 4 20 4 20 8'/%3E%3C/svg%3E"); }
.icon-fillet { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M4 20V12a8 8 0 0 1 8-8h8'/%3E%3C/svg%3E"); }
.icon-mirror { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='12' y1='3' x2='12' y2='21' stroke-dasharray='3 3'/%3E%3Cpath d='M8 6L4 12l4 6'/%3E%3Cpath d='M16 6l4 6-4 6'/%3E%3C/svg%3E"); }
.icon-floor { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cline x1='12' y1='5' x2='12' y2='19'/%3E%3Cpolyline points='19 12 12 19 5 12'/%3E%3Cline x1='4' y1='21' x2='20' y2='21'/%3E%3C/svg%3E"); }
.icon-center { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='3'/%3E%3Cpath d='M12 2v4M12 18v4M2 12h4M18 12h4'/%3E%3C/svg%3E"); }
.icon-pattern { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2'%3E%3Crect x='3' y='3' width='6' height='6' rx='1'/%3E%3Crect x='13' y='3' width='6' height='6' rx='1' opacity='.5'/%3E%3Crect x='3' y='13' width='6' height='6' rx='1' opacity='.5'/%3E%3Crect x='13' y='13' width='6' height='6' rx='1' opacity='.3'/%3E%3C/svg%3E"); }
.icon-align { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='12' y1='3' x2='12' y2='21'/%3E%3Crect x='5' y='7' width='6' height='4'/%3E%3Crect x='13' y='13' width='6' height='4'/%3E%3C/svg%3E"); }
.icon-measure { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M2 20L22 4'/%3E%3Cpath d='M2 20l3-3'/%3E%3Cpath d='M7 15l2-2'/%3E%3Cpath d='M12 10l2-2'/%3E%3Cpath d='M17 5l3-3'/%3E%3C/svg%3E"); }
.icon-section { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M2 12h20'/%3E%3Crect x='5' y='4' width='14' height='16' rx='2' opacity='.4'/%3E%3C/svg%3E"); }
.icon-tutorial { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M22 10v6M2 10l10-5 10 5-10 5z'/%3E%3Cpath d='M6 12v5c3 3 9 3 12 0v-5'/%3E%3C/svg%3E"); }
.icon-menu { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='3' y1='12' x2='21' y2='12'/%3E%3Cline x1='3' y1='6' x2='21' y2='6'/%3E%3Cline x1='3' y1='18' x2='21' y2='18'/%3E%3C/svg%3E"); }
.icon-x { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Cline x1='18' y1='6' x2='6' y2='18'/%3E%3Cline x1='6' y1='6' x2='18' y2='18'/%3E%3C/svg%3E"); }
.icon-face-extrude { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round'%3E%3Crect x='3' y='6' width='12' height='12' rx='1'/%3E%3Cpath d='M15 10h6M15 14h6'/%3E%3Cpath d='M18 7v10'/%3E%3Cpath d='M21 10l-3-3M21 14l-3 3'/%3E%3C/svg%3E"); }
.icon-help { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23636e72' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3'/%3E%3Cline x1='12' y1='17' x2='12.01' y2='17'/%3E%3C/svg%3E"); }