:root{--bg: #f8fafc;--panel: #ffffff;--panel-border: #e2e8f0;--text: #1f2937;--text-muted: #64748b;--accent: #2563eb;--accent-soft: #dbeafe;--danger: #dc2626;--shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 1px 3px rgba(0, 0, 0, .06);--radius: 6px;--sidebar-width: 360px}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:14px;color:var(--text);background:var(--bg);overflow:hidden}#app{height:100vh;display:grid;grid-template-columns:var(--sidebar-width) 1fr}.sidebar{background:var(--panel);border-right:1px solid var(--panel-border);overflow-y:auto;display:flex;flex-direction:column}.sidebar-header{padding:16px 20px 12px;border-bottom:1px solid var(--panel-border)}.sidebar-header h1{margin:0;font-size:18px;font-weight:600;letter-spacing:-.01em}.sidebar-header .subtitle{margin-top:2px;font-size:12px;color:var(--text-muted)}.sidebar-section{padding:12px 16px;border-bottom:1px solid var(--panel-border)}.sidebar-section h2{margin:0 0 8px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.equation-list{display:flex;flex-direction:column;gap:8px}.equation-row{display:grid;grid-template-columns:24px 1fr auto;gap:8px;align-items:center;padding:8px;background:var(--bg);border:1px solid var(--panel-border);border-radius:var(--radius);position:relative}.equation-row.has-error{border-color:var(--danger)}.color-swatch{width:24px;height:24px;border-radius:50%;border:2px solid var(--panel);box-shadow:var(--shadow);cursor:pointer;padding:0;position:relative}.color-swatch input{opacity:0;position:absolute;inset:0;cursor:pointer}.equation-row math-field{font-size:16px;background:var(--panel);border:1px solid var(--panel-border);border-radius:4px;padding:6px 8px;min-height:36px;--keyboard-zindex: 1000}.equation-row math-field:focus{outline:2px solid var(--accent);outline-offset:-1px}.equation-actions{display:flex;gap:4px}.icon-btn{width:28px;height:28px;border:1px solid var(--panel-border);background:var(--panel);border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:14px;padding:0}.icon-btn:hover{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}.icon-btn.danger:hover{background:#fee2e2;color:var(--danger);border-color:var(--danger)}.add-equation-btn{width:100%;padding:8px;border:1px dashed var(--panel-border);background:transparent;border-radius:var(--radius);cursor:pointer;color:var(--text-muted);font-size:13px;margin-top:4px}.add-equation-btn:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.equation-error{grid-column:2 / -1;font-size:11px;color:var(--danger);margin-top:2px}.equation-meta{grid-column:2 / -1;font-size:10px;color:var(--text-muted);margin-top:2px;font-family:ui-monospace,SF Mono,Menlo,monospace}.viewport-controls{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}.viewport-btn{padding:6px 10px;border:1px solid var(--panel-border);background:var(--panel);border-radius:4px;cursor:pointer;font-size:12px;color:var(--text)}.viewport-btn:hover{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}.viewport-btn.primary{background:var(--accent-soft);color:var(--accent);border-color:var(--accent);font-weight:500}.viewport-btn.primary:hover{background:var(--accent);color:#fff}.viewport-readout{display:grid;grid-template-columns:auto 1fr;column-gap:8px;row-gap:2px;font-size:11px;color:var(--text-muted);font-family:ui-monospace,SF Mono,Menlo,monospace;margin-top:8px}.canvas-container{position:relative;background:var(--panel)}#graph-canvas{position:absolute;inset:0;width:100%;height:100%;cursor:grab}#graph-canvas.dragging{cursor:grabbing}.export-btn{width:100%;padding:10px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);cursor:pointer;font-size:14px;font-weight:500;margin-top:4px}.export-btn:hover{background:#1d4ed8}.export-btn.secondary{background:var(--panel);color:var(--accent);border:1px solid var(--accent)}.export-btn.secondary:hover{background:var(--accent-soft)}.export-dialog{border:none;border-radius:8px;padding:0;max-width:460px;width:90vw;box-shadow:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a}.export-dialog::backdrop{background:#0f172a66}.export-dialog form{padding:20px 24px;display:flex;flex-direction:column;gap:14px}.export-dialog h2{margin:0;font-size:18px;font-weight:600}.form-row{display:flex;flex-direction:column;gap:6px}.form-row label{font-size:12px;font-weight:500;color:var(--text-muted)}.form-row-pair{flex-direction:row;gap:12px}.form-row-pair>div{flex:1;display:flex;flex-direction:column;gap:6px}.form-row input[type=number],.form-row input[type=text],.form-row select{padding:8px 10px;border:1px solid var(--panel-border);border-radius:4px;font-size:14px;font-family:inherit}.form-row input:focus,.form-row select:focus{outline:2px solid var(--accent);outline-offset:-1px}.size-presets{display:flex;gap:6px}.preset-btn{flex:1;padding:6px 8px;background:var(--panel);border:1px solid var(--panel-border);border-radius:4px;cursor:pointer;font-size:11px;color:var(--text)}.preset-btn:hover{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}.preset-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.checkbox-row label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text);cursor:pointer}.export-summary{font-size:12px;color:var(--text-muted);padding:8px 10px;background:var(--bg);border-radius:4px}.export-summary strong{color:var(--text)}.export-summary .warn{color:var(--danger)}.export-summary .hint{font-style:italic}.export-error{font-size:12px;color:var(--danger);padding:8px 10px;background:#fef2f2;border-radius:4px}.dialog-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:4px}.btn-primary{padding:8px 16px;background:var(--accent);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:13px;font-weight:500}.btn-primary:hover:not(:disabled){background:#1d4ed8}.btn-primary:disabled{background:#94a3b8;cursor:not-allowed}.btn-secondary{padding:8px 16px;background:var(--panel);color:var(--text);border:1px solid var(--panel-border);border-radius:4px;cursor:pointer;font-size:13px}.btn-secondary:hover:not(:disabled){background:var(--bg)}.batch-dialog{border:none;border-radius:8px;padding:0;max-width:640px;width:92vw;box-shadow:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a}.batch-dialog::backdrop{background:#0f172a66}.batch-dialog-inner{padding:20px 24px;display:flex;flex-direction:column;gap:12px}.batch-dialog h2{margin:0;font-size:18px;font-weight:600}.tab-row{display:flex;gap:4px;align-items:center;border-bottom:1px solid var(--panel-border);padding-bottom:6px}.tab{padding:6px 12px;background:transparent;border:1px solid transparent;border-radius:4px;cursor:pointer;font-size:13px;color:var(--text-muted)}.tab:hover:not(:disabled){background:var(--bg);color:var(--text)}.tab.active{background:var(--accent-soft);color:var(--accent)}.tab-link{margin-left:auto;padding:6px 8px;background:transparent;border:none;cursor:pointer;font-size:12px;color:var(--text-muted);text-decoration:underline}.tab-link:hover:not(:disabled){color:var(--accent)}.batch-text{min-height:220px;max-height:40vh;padding:10px 12px;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:12px;line-height:1.5;border:1px solid var(--panel-border);border-radius:4px;resize:vertical}.batch-text:focus{outline:2px solid var(--accent);outline-offset:-1px}.batch-summary{font-size:12px;color:var(--text-muted);padding:8px 10px;background:var(--bg);border-radius:4px}.batch-summary strong{color:var(--text)}.batch-summary .warn{color:var(--danger)}.batch-progress{display:flex;flex-direction:column;gap:6px}.batch-progress .bar{height:6px;background:var(--bg);border-radius:3px;overflow:hidden}.batch-progress .fill{height:100%;background:var(--accent);transition:width .15s ease-out}.batch-progress .label{font-size:11px;color:var(--text-muted);font-family:ui-monospace,SF Mono,Menlo,monospace}.batch-item-errors{font-size:12px;background:#fffbeb;border:1px solid #fde68a;border-radius:4px;padding:8px 10px}.batch-item-errors summary{cursor:pointer;font-weight:500;color:#92400e}.batch-item-errors ul{margin:6px 0 0;padding-left:20px;color:#78350f}.batch-item-errors code{font-family:ui-monospace,SF Mono,Menlo,monospace;background:#fef3c7;padding:1px 4px;border-radius:2px}.batch-error{font-size:12px;color:var(--danger);padding:8px 10px;background:#fef2f2;border-radius:4px}a.btn-primary{text-decoration:none;display:inline-flex;align-items:center}