.maths-toolbar.svelte-1olv8j0{display:flex;flex-wrap:wrap;gap:var(--space-1, 4px);padding:var(--space-1, 4px) 0}.maths-btn.svelte-1olv8j0{display:inline-flex;align-items:center;justify-content:center;min-width:48px;min-height:44px;padding:var(--space-1, 4px) var(--space-2, 8px);border:1px solid var(--color-border);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface);cursor:pointer;font-size:16px;color:var(--color-text-primary);transition:background .1s,border-color .1s;font-family:inherit}.maths-btn.svelte-1olv8j0:hover,.maths-btn.svelte-1olv8j0:focus-visible{background:var(--brand-50, #f0f4ff);border-color:var(--brand-600)}.maths-btn.svelte-1olv8j0:active{background:var(--brand-100, #dbeafe)}.maths-btn.svelte-1olv8j0:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}.calc-backdrop.svelte-12esrx6{position:fixed;inset:0;background:#0000004d;z-index:99}.calc-panel.svelte-12esrx6{position:fixed;bottom:0;left:0;right:0;background:var(--color-bg-surface, #fff);border-top:1px solid var(--color-border);border-radius:16px 16px 0 0;box-shadow:0 -4px 24px #00000026;padding:12px 16px calc(env(safe-area-inset-bottom,8px) + 12px);z-index:100;max-width:400px;margin:0 auto;animation:svelte-12esrx6-calc-slide-up .25s ease-out}@keyframes svelte-12esrx6-calc-slide-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}.calc-display.svelte-12esrx6{background:var(--color-bg-subtle, #f5f5f5);border-radius:var(--radius-md, 8px);padding:12px 16px;margin-bottom:8px;min-height:56px;display:flex;flex-direction:column;justify-content:center;align-items:flex-end}.calc-display__expr.svelte-12esrx6{font-size:20px;font-family:var(--font-family, inherit);color:var(--color-text-primary);word-break:break-all}.calc-display__result.svelte-12esrx6{font-size:14px;color:var(--color-text-secondary);margin-top:2px}.calc-display__result--error.svelte-12esrx6{color:var(--color-feedback-error, #dc2626)}.calc-insert-btn.svelte-12esrx6{width:100%;padding:10px;margin-bottom:8px;background:var(--brand-600, #2563eb);color:#fff;border:none;border-radius:var(--radius-md, 8px);font-size:14px;font-weight:600;cursor:pointer;font-family:inherit;min-height:44px}.calc-insert-btn.svelte-12esrx6:hover{background:var(--brand-700, #1d4ed8)}.calc-row--advanced.svelte-12esrx6{display:flex;gap:4px;margin-bottom:4px;overflow-x:auto}.calc-grid.svelte-12esrx6{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}.calc-btn.svelte-12esrx6{display:flex;align-items:center;justify-content:center;min-height:48px;border:1px solid var(--color-border, #e5e7eb);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface, #fff);font-size:18px;font-family:inherit;color:var(--color-text-primary);cursor:pointer;transition:background .1s;-webkit-tap-highlight-color:transparent}.calc-btn.svelte-12esrx6:active{background:var(--gray-100, #f3f4f6)}.calc-btn--op.svelte-12esrx6{background:var(--gray-50, #f9fafb);color:var(--brand-600, #2563eb);font-weight:600}.calc-btn--func.svelte-12esrx6{font-size:14px;font-weight:600;min-width:44px;flex-shrink:0;padding:0 8px}.calc-btn--disabled.svelte-12esrx6{opacity:.3;cursor:not-allowed}.calc-btn--control.svelte-12esrx6{background:var(--gray-100, #f3f4f6);font-weight:600;color:var(--color-text-secondary)}.calc-btn--equals.svelte-12esrx6{background:var(--brand-600, #2563eb);color:#fff;border-color:var(--brand-600, #2563eb);font-weight:700}.calc-btn--equals.svelte-12esrx6:active{background:var(--brand-700, #1d4ed8)}@media(prefers-reduced-motion:reduce){.calc-panel.svelte-12esrx6{animation:none}}.multipart.svelte-59kigy,.multipart__inputs.svelte-59kigy{display:flex;flex-direction:column;gap:16px}.multipart__part.svelte-59kigy{display:flex;flex-direction:column;gap:8px}.multipart__label.svelte-59kigy{font-size:14px;font-weight:600;color:var(--color-text-secondary)}.multipart__input-wrapper.svelte-59kigy{position:relative;display:flex;align-items:center;border:1px solid var(--color-border);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface);transition:border-color .15s}.multipart__input-wrapper.svelte-59kigy:focus-within{border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100, rgba(37, 99, 235, .1))}.multipart__prefix.svelte-59kigy{padding-left:12px;font-size:14px;font-weight:600;color:var(--color-text-secondary);white-space:nowrap;user-select:none}.multipart__input.svelte-59kigy{width:100%;min-height:44px;padding:10px 12px;font-size:15px;font-family:var(--font-family, inherit);border:none;border-radius:var(--radius-md, 8px);background:transparent;color:var(--color-text-primary)}.multipart__input.has-prefix.svelte-59kigy{padding-left:8px}.multipart__input.svelte-59kigy:focus{outline:none}.multipart__input.svelte-59kigy:disabled{opacity:.6;cursor:not-allowed}.multipart__input.svelte-59kigy::placeholder{color:var(--color-text-muted)}.multipart__preview.svelte-59kigy{font-size:14px;color:var(--color-text-secondary);padding:4px 0}.multipart__actions.svelte-59kigy{display:flex;flex-direction:column;gap:8px}.multipart__submit.svelte-59kigy{min-height:48px;width:100%;justify-content:center;font-size:15px}.multipart__hint.svelte-59kigy{font-size:12px;color:var(--color-text-muted);text-align:center;margin:0}@media(max-width:480px){.multipart__input.svelte-59kigy{min-height:48px;font-size:16px}}.qcard.svelte-1x9kgo0{background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg, 12px);box-shadow:var(--shadow-card, 0 1px 3px rgba(0,0,0,.1));padding:32px 24px;display:flex;flex-direction:column;gap:16px}.qcard__header.svelte-1x9kgo0{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}.qcard__tier.svelte-1x9kgo0{font-size:12px;text-transform:capitalize}.qcard__lesson.svelte-1x9kgo0{font-size:13px;color:var(--color-text-secondary);text-decoration:none;display:inline-flex;align-items:center;gap:4px}.qcard__lesson.svelte-1x9kgo0:hover{color:var(--brand-600);text-decoration:underline}.qcard__lesson.svelte-1x9kgo0:before{content:"📖";font-size:14px}.qcard__question.svelte-1x9kgo0{font-size:17px;line-height:1.6;color:var(--color-text-primary)}.qcard__question.svelte-1x9kgo0 .katex{font-size:1.2em}.qcard__question.svelte-1x9kgo0 .katex-display-wrapper{display:block;text-align:center;margin:12px 0}.qcard__input-wrapper.svelte-1x9kgo0{position:relative;display:flex;align-items:center;border:1px solid var(--color-border);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface);transition:border-color .15s}.qcard__input-wrapper.svelte-1x9kgo0:focus-within{border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100, rgba(37, 99, 235, .1))}.qcard__input-prefix.svelte-1x9kgo0{padding-left:16px;font-size:16px;font-weight:600;color:var(--color-text-secondary);white-space:nowrap;user-select:none}.qcard__input.svelte-1x9kgo0{width:100%;min-height:48px;padding:12px 16px;font-size:16px;font-family:var(--font-family, inherit);border:none;border-radius:var(--radius-md, 8px);background:transparent;color:var(--color-text-primary)}.qcard__input.has-prefix.svelte-1x9kgo0{padding-left:8px}.qcard__input.svelte-1x9kgo0:focus{outline:none}.qcard__input.svelte-1x9kgo0::placeholder{color:var(--color-text-muted)}.qcard__calc-toggle.svelte-1x9kgo0{display:flex;align-items:center;justify-content:center;width:44px;height:44px;margin-right:4px;border:none;background:none;color:var(--color-text-secondary);cursor:pointer;border-radius:var(--radius-sm, 4px);flex-shrink:0}.qcard__calc-toggle.svelte-1x9kgo0:hover{color:var(--brand-600);background:var(--brand-50, #f0f4ff)}.qcard__preview.svelte-1x9kgo0{display:flex;align-items:center;gap:12px;padding:8px 12px;background:var(--gray-50, #f9fafb);border-radius:var(--radius-md, 8px);min-height:40px}.qcard__preview-label.svelte-1x9kgo0{font-size:12px;color:var(--color-text-tertiary, var(--color-text-secondary));flex-shrink:0}.qcard__preview-math.svelte-1x9kgo0{font-size:18px;color:var(--color-text-primary)}.qcard__actions.svelte-1x9kgo0{display:flex;flex-direction:column;gap:8px}.qcard__check-btn.svelte-1x9kgo0{min-height:48px;width:100%;justify-content:center;font-size:15px}.qcard__skip.svelte-1x9kgo0{display:block;margin:0 auto;background:none;border:none;font-size:13px;color:var(--color-text-muted);cursor:pointer;text-decoration:underline;font-family:inherit;padding:8px;min-height:44px}.qcard__skip.svelte-1x9kgo0:hover{color:var(--color-text-secondary)}.qcard__feedback.svelte-1x9kgo0{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:var(--radius-md, 8px);font-weight:600;font-size:15px}.qcard__feedback--correct.svelte-1x9kgo0{background:#d1fae5;color:#065f46}.qcard__feedback--wrong.svelte-1x9kgo0{background:#fee2e2;color:#991b1b}.qcard__feedback-icon.svelte-1x9kgo0{font-size:20px;font-weight:700}.qcard__detail.svelte-1x9kgo0{display:flex;flex-direction:column;gap:8px;font-size:14px}.qcard__correct-answer.svelte-1x9kgo0{text-align:center;font-size:20px;font-weight:600;color:var(--brand-600);padding:8px 0}.qcard__correct-answer.svelte-1x9kgo0 .katex{font-size:1.2em}.qcard__misconception.svelte-1x9kgo0{background:#fef3c7;color:#92400e;padding:12px 16px;border-radius:var(--radius-md, 8px);border-left:3px solid #f59e0b;font-size:14px}.qcard__worked.svelte-1x9kgo0{border:1px solid var(--color-border);border-radius:var(--radius-md, 8px);padding:12px 16px}.qcard__worked.svelte-1x9kgo0 summary:where(.svelte-1x9kgo0){cursor:pointer;min-height:44px;display:flex;align-items:center;font-size:14px}.qcard__worked-body.svelte-1x9kgo0{margin-top:12px;line-height:1.8;font-size:14px}.qcard__report.svelte-1x9kgo0{padding-top:8px;border-top:1px solid var(--color-border, #e5e7eb)}.qcard__report-link.svelte-1x9kgo0{background:none;border:none;font-size:13px;color:var(--color-text-muted, #9ca3af);cursor:pointer;font-family:inherit;padding:8px 0;min-height:44px;display:flex;align-items:center;gap:4px}.qcard__report-link.svelte-1x9kgo0:before{content:"⚠️";font-size:14px}.qcard__report-link.svelte-1x9kgo0:hover{color:var(--color-text-secondary)}.qcard__report-form.svelte-1x9kgo0{display:flex;flex-direction:column;gap:8px}.qcard__report-label.svelte-1x9kgo0{font-size:13px;font-weight:600;color:var(--color-text-secondary)}.qcard__report-input.svelte-1x9kgo0{width:100%;padding:8px 12px;font-size:14px;font-family:var(--font-family, inherit);border:1px solid var(--color-border, #e5e7eb);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface, #fff);color:var(--color-text-primary);resize:vertical}.qcard__report-input.svelte-1x9kgo0:focus{outline:none;border-color:var(--brand-600)}.qcard__report-actions.svelte-1x9kgo0{display:flex;gap:8px;align-items:center}.qcard__report-submit.svelte-1x9kgo0{font-size:13px;padding:8px 16px;min-height:40px}.qcard__report-cancel.svelte-1x9kgo0{background:none;border:none;font-size:13px;color:var(--color-text-muted);cursor:pointer;font-family:inherit;padding:8px;min-height:40px}.qcard__report-cancel.svelte-1x9kgo0:hover{color:var(--color-text-secondary)}.qcard__report-done.svelte-1x9kgo0{font-size:13px;color:var(--color-feedback-success, #27AE60);padding:8px 0}.qcard__report-failed.svelte-1x9kgo0{font-size:13px;color:#dc2626;padding:8px 0}@media(max-width:480px){.qcard.svelte-1x9kgo0{padding:24px 16px}.qcard__question.svelte-1x9kgo0{font-size:16px}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.rating-buttons.svelte-vtxpkz{display:flex;gap:12px;margin-top:24px}.rating-btn.svelte-vtxpkz{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:16px 12px;border:2px solid var(--color-border);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface);cursor:pointer;min-height:48px;transition:background .15s,border-color .15s,transform .1s;font-family:inherit}.rating-btn.svelte-vtxpkz:active{transform:scale(.97)}.rating-btn__label.svelte-vtxpkz{font-size:15px;font-weight:600}.rating-btn__interval.svelte-vtxpkz{font-size:12px;color:var(--color-text-muted)}.rating-btn--again.svelte-vtxpkz{border-color:var(--color-feedback-error, #E74C3C);color:var(--color-feedback-error, #E74C3C)}.rating-btn--again.svelte-vtxpkz:hover{background:#fdf2f2}.rating-btn--good.svelte-vtxpkz{border-color:var(--brand-600, #2563eb);color:var(--brand-600, #2563eb)}.rating-btn--good.svelte-vtxpkz:hover{background:var(--brand-50, #f0f4ff)}.rating-btn--easy.svelte-vtxpkz{border-color:var(--color-feedback-success, #27AE60);color:var(--color-feedback-success, #27AE60)}.rating-btn--easy.svelte-vtxpkz:hover{background:#f0fdf4}.rating-btn--suggested.svelte-vtxpkz{box-shadow:0 0 0 3px #2563eb26;font-weight:700}.rating-hint.svelte-vtxpkz{text-align:center;font-size:12px;color:var(--color-text-muted);margin-top:12px}@media(max-width:480px){.rating-buttons.svelte-vtxpkz{gap:8px}.rating-btn.svelte-vtxpkz{padding:14px 8px}}.summary.svelte-1okva8a{max-width:640px;margin:0 auto;text-align:center}.summary__heading.svelte-1okva8a{font-size:24px;font-weight:700;color:var(--color-text-primary);margin-bottom:8px}.summary__score-card.svelte-1okva8a{display:flex;flex-direction:column;align-items:center;gap:8px;margin:24px auto;padding:32px;background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg, 12px);box-shadow:var(--shadow-card, 0 1px 3px rgba(0,0,0,.1))}.summary__feedback.svelte-1okva8a{font-size:16px;color:var(--color-text-secondary)}.summary__score.svelte-1okva8a{font-size:48px;font-weight:700;color:var(--brand-600);line-height:1}.summary__streak.svelte-1okva8a{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:#f59e0b;margin-top:8px}.summary__breakdown.svelte-1okva8a{text-align:left;display:flex;flex-direction:column;gap:8px;margin-bottom:24px}.summary__row.svelte-1okva8a{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:var(--radius-md, 8px);font-size:14px}.summary__row--correct.svelte-1okva8a{background:#d1fae5}.summary__row--wrong.svelte-1okva8a{background:#fee2e2}.summary__row-icon.svelte-1okva8a{font-size:16px;font-weight:700;flex-shrink:0;width:24px;text-align:center}.summary__row--correct.svelte-1okva8a .summary__row-icon:where(.svelte-1okva8a){color:#065f46}.summary__row--wrong.svelte-1okva8a .summary__row-icon:where(.svelte-1okva8a){color:#991b1b}.summary__row-question.svelte-1okva8a{flex:1;min-width:0;overflow-wrap:break-word}.summary__actions.svelte-1okva8a{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.summary__btn.svelte-1okva8a{min-height:48px;min-width:160px;justify-content:center;font-size:15px}