.visual.svelte-ogkzkz{display:block;overflow:visible}.grid.svelte-ogkzkz{stroke:var(--border);stroke-width:.5px;opacity:.6}.axis.svelte-ogkzkz{stroke:var(--text-muted);stroke-width:1px}.curve.svelte-ogkzkz{fill:none;stroke:var(--accent);stroke-width:1.75px;stroke-linejoin:round;stroke-linecap:round}.root.svelte-ogkzkz{fill:var(--accent)}.proj.svelte-ogkzkz{stroke:var(--accent);stroke-width:1px;stroke-dasharray:3 2;opacity:.45}.point.svelte-ogkzkz{fill:var(--accent);stroke:var(--surface);stroke-width:1.5px}.point-label.svelte-ogkzkz{fill:var(--text);font-family:ui-sans-serif,system-ui,sans-serif;font-size:11px;font-weight:600}.tick.svelte-ogkzkz{fill:var(--text-subtle);font-family:ui-sans-serif,system-ui,sans-serif;font-size:9px}.shape.svelte-ogkzkz{fill:var(--surface-accent);stroke:var(--accent);stroke-width:2px;stroke-linejoin:round}.right-angle.svelte-ogkzkz{fill:none;stroke:var(--accent);stroke-width:1.25px}.arc.svelte-ogkzkz{fill:none;stroke:var(--accent);stroke-width:1.5px}.arc.unknown.svelte-ogkzkz{stroke:var(--error,#c33);stroke-width:2px}.angle-label.svelte-ogkzkz{fill:var(--text);font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px;font-weight:500}.angle-label.unknown.svelte-ogkzkz{fill:var(--error,#c33);font-weight:700}.dot.svelte-ogkzkz{fill:var(--accent)}.tick-major.svelte-ogkzkz{stroke:var(--text-muted);stroke-width:1.5px}.tick-minor.svelte-ogkzkz{stroke:var(--text-subtle);stroke-width:1px}.jump.svelte-ogkzkz{fill:none;stroke:var(--accent);stroke-width:2.25px}.jump-arrow.svelte-ogkzkz{fill:var(--accent)}.jump-label.svelte-ogkzkz{fill:var(--accent);font-family:ui-sans-serif,system-ui,sans-serif;font-size:15px;font-weight:600}.tick.numline.svelte-ogkzkz{font-size:12px}.digit.svelte-ogkzkz{fill:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:500}.digit.op.svelte-ogkzkz{fill:var(--text-muted)}.digit.carry.svelte-ogkzkz{fill:var(--accent);font-weight:600}.digit.result.svelte-ogkzkz{fill:var(--success-text,var(--text));font-weight:600}.guided.svelte-7l1poy{max-width:640px}.header.svelte-7l1poy{color:var(--text-muted);margin:1rem 0 .75rem;font-size:1.05rem}.trail.svelte-7l1poy{background:var(--surface);border:1px solid var(--border);border-radius:8px;flex-direction:column;gap:.25rem;margin-bottom:1.25rem;padding:1rem 1.25rem;display:flex}.eq.svelte-7l1poy{text-align:center}.eq.start.svelte-7l1poy{opacity:.85}.via.svelte-7l1poy{color:var(--text-muted);justify-content:center;align-items:center;gap:.4rem;margin:.15rem 0;font-size:.9rem;display:flex}.arrow.svelte-7l1poy{color:var(--accent);font-size:1.3rem;line-height:1}.via-text.svelte-7l1poy{color:var(--text-subtle)}.via.wrong.svelte-7l1poy,.via.wrong.svelte-7l1poy .arrow:where(.svelte-7l1poy){color:var(--error,#c0392b)}.wrong-mark.svelte-7l1poy{margin-left:.25rem}.misconception.svelte-7l1poy{background:var(--error-bg);border:1px solid var(--error-border);border-radius:6px;margin:0 0 1rem;padding:.85rem 1rem}.mc-head.svelte-7l1poy{color:var(--error,var(--text));margin-bottom:.4rem;font-size:.95rem;font-weight:600}.mc-body.svelte-7l1poy{color:var(--text);margin-bottom:.75rem;font-size:.95rem;line-height:1.5}.mc-hint.svelte-7l1poy{color:var(--text-subtle);font-size:.8rem}.mc-controls.svelte-7l1poy{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.moves-label.svelte-7l1poy{color:var(--text-subtle);margin-bottom:.5rem;font-size:.85rem}.choices.svelte-7l1poy{grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:.75rem;display:grid}@media (width<=480px){.choices.svelte-7l1poy{grid-template-columns:1fr}}.choice.svelte-7l1poy{background:var(--surface);border:2px solid var(--border-strong);text-align:left;cursor:pointer;color:var(--text);border-radius:8px;justify-content:flex-start;align-items:center;gap:.5rem;padding:1rem 1.25rem;font-family:inherit;font-size:1rem;transition:all .12s;display:flex}.choice.svelte-7l1poy:hover{border-color:var(--accent);background:var(--surface-accent)}.choice.focused.svelte-7l1poy{border-color:var(--accent);background:var(--surface-accent);box-shadow:0 0 0 3px var(--focus-ring)}.op-text.svelte-7l1poy{color:var(--text-muted);font-size:.95rem}.kbd-hint.svelte-7l1poy{color:var(--text-subtle);margin-bottom:.5rem;font-size:.8rem}.controls.svelte-7l1poy{flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:1rem;display:flex}.btn.svelte-7l1poy{cursor:pointer;border:1px solid var(--border);border-radius:6px;padding:.4rem .8rem;font-family:inherit;font-size:.9rem}.btn.ghost.svelte-7l1poy{color:var(--text-subtle);background:0 0}.btn.ghost.svelte-7l1poy:hover{color:var(--text);background:var(--surface-hover);border-color:var(--border-strong)}.btn.primary.svelte-7l1poy{background:var(--surface);color:var(--text);border-color:var(--border-strong);font-weight:600}.btn.primary.svelte-7l1poy:hover{background:var(--surface-hover);border-color:var(--accent)}.feedback.svelte-7l1poy{border-radius:8px;margin-bottom:1rem;padding:1rem 1.25rem}.feedback.ok.svelte-7l1poy{background:var(--success-bg);border:1px solid var(--success-border)}.feedback.bad.svelte-7l1poy{background:var(--error-bg);border:1px solid var(--error-border)}.hint.svelte-7l1poy{margin:.5rem 0 1rem;line-height:1.5}.next.svelte-7l1poy{background:var(--next-bg);color:var(--next-fg);cursor:pointer;border:none;border-radius:6px;align-items:center;gap:.4rem;margin-top:.75rem;padding:.55rem 1rem;font-family:inherit;font-size:.95rem;display:inline-flex}.next.svelte-7l1poy:hover{background:var(--next-hover-bg)}.dead-end.svelte-7l1poy{background:var(--surface-raised);border:1px dashed var(--border-strong);color:var(--text-muted);border-radius:6px;flex-wrap:wrap;align-items:center;gap:.75rem;padding:.75rem 1rem;font-size:.9rem;display:flex}.help.svelte-7l1poy{color:var(--text-subtle);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:6px;align-items:center;gap:.45rem;margin-top:1rem;padding:.4rem .75rem;font-family:inherit;font-size:.9rem;display:inline-flex}.help.svelte-7l1poy:hover{color:var(--text);background:var(--surface-hover);border-color:var(--border-strong)}.qmark.svelte-7l1poy{font-size:1rem;font-weight:700;line-height:1}kbd.svelte-7l1poy{background:var(--surface-raised);border:1px solid var(--border);color:var(--text-muted);border-radius:4px;margin:0 .05rem;padding:0 .35rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem;line-height:1.4;display:inline-block}.next.svelte-7l1poy kbd:where(.svelte-7l1poy){color:inherit;background:#ffffff2e;border-color:#ffffff40;margin-left:.4rem}.problem.svelte-tdbmia{max-width:640px}.prompt.svelte-tdbmia{margin:1.5rem 0;font-size:1.25rem;line-height:1.6}.choices.svelte-tdbmia{grid-template-columns:1fr 1fr;gap:.75rem;margin-bottom:1rem;display:grid}@media (width<=480px){.choices.svelte-tdbmia{grid-template-columns:1fr}}.choice.svelte-tdbmia{background:var(--surface);border:2px solid var(--border-strong);text-align:left;cursor:pointer;color:var(--text);border-radius:8px;justify-content:space-between;align-items:center;gap:.5rem;padding:1rem 1.25rem;font-size:1rem;transition:all .12s;display:flex}.choice.visual.svelte-tdbmia{justify-content:center;padding:.5rem;position:relative}.choice.visual.svelte-tdbmia .badge:where(.svelte-tdbmia){position:absolute;top:.35rem;right:.5rem}.prompt-visual.svelte-tdbmia{margin-top:.75rem}.choice.svelte-tdbmia:hover:not(:disabled){border-color:var(--accent);background:var(--surface-accent)}.choice.focused.svelte-tdbmia:not(:disabled){border-color:var(--accent);background:var(--surface-accent);box-shadow:0 0 0 3px var(--focus-ring)}.choice.svelte-tdbmia:disabled{cursor:default}.choice.selected.svelte-tdbmia{border-color:var(--accent)}.choice.correct.svelte-tdbmia{border-color:var(--success);background:var(--success-bg)}.choice.wrong.svelte-tdbmia{border-color:var(--error);background:var(--error-bg)}.choice.dim.svelte-tdbmia{opacity:.5}.badge.svelte-tdbmia{font-size:1.1rem;font-weight:700}.choice.correct.svelte-tdbmia .badge:where(.svelte-tdbmia){color:var(--success)}.choice.wrong.svelte-tdbmia .badge:where(.svelte-tdbmia){color:var(--error)}.feedback.svelte-tdbmia{border-radius:8px;margin-bottom:1rem;padding:1rem 1.25rem}.feedback.ok.svelte-tdbmia{background:var(--success-bg);border:1px solid var(--success-border)}.feedback.bad.svelte-tdbmia{background:var(--error-bg);border:1px solid var(--error-border)}.hint.svelte-tdbmia{margin:.5rem 0 1rem;line-height:1.5}.below-choices.svelte-tdbmia{justify-content:space-between;align-items:center;gap:1rem;margin-bottom:.5rem;display:flex}.help.svelte-tdbmia{color:var(--text-subtle);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:6px;align-items:center;gap:.45rem;margin-top:.5rem;padding:.4rem .75rem;font-family:inherit;font-size:.9rem;display:inline-flex}.help.svelte-tdbmia:hover{color:var(--text);background:var(--surface-hover);border-color:var(--border-strong)}.qmark.svelte-tdbmia{font-size:1rem;font-weight:700;line-height:1}.next.svelte-tdbmia{background:var(--next-bg);color:var(--next-fg);cursor:pointer;border:none;border-radius:6px;align-items:center;gap:.4rem;margin-top:.75rem;padding:.55rem 1rem;font-size:.95rem;display:inline-flex}.next.svelte-tdbmia:hover{background:var(--next-hover-bg)}.kbd-hint.svelte-tdbmia{color:var(--text-subtle);margin-bottom:.5rem;font-size:.8rem}.aids-strip.svelte-tdbmia{flex-wrap:wrap;align-items:flex-start;gap:.5rem;margin-bottom:.75rem;display:flex}.aid-toggle.svelte-tdbmia{color:var(--text-subtle);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:999px;padding:.35rem .7rem;font-family:inherit;font-size:.85rem}.aid-toggle.svelte-tdbmia:hover{color:var(--text);background:var(--surface-hover);border-color:var(--border-strong)}.aid-toggle.open.svelte-tdbmia{background:var(--surface-accent);color:var(--text);border-color:var(--accent)}.aid-view.svelte-tdbmia{flex-basis:100%}.demo.svelte-tdbmia{flex-direction:column;align-items:flex-start;gap:.75rem;margin-bottom:1rem;display:flex}.demo-view.svelte-tdbmia{border:1px solid var(--border);background:var(--surface);border-radius:8px;padding:.75rem}.demo-btn.svelte-tdbmia{color:var(--text-subtle);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:6px;align-items:center;gap:.4rem;margin-top:.5rem;margin-left:.5rem;padding:.4rem .75rem;font-family:inherit;font-size:.9rem;display:inline-flex}.demo-btn.svelte-tdbmia:hover{color:var(--text);background:var(--surface-hover);border-color:var(--border-strong)}.aided-note.svelte-tdbmia{color:var(--text-muted);margin-top:.4rem;font-size:.85rem;font-style:italic}kbd.svelte-tdbmia{background:var(--surface-raised);border:1px solid var(--border);color:var(--text-muted);border-radius:4px;margin:0 .05rem;padding:0 .35rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem;line-height:1.4;display:inline-block}