.celebration-checkmark.svelte-1a9hufs{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:1000;pointer-events:none}@media(prefers-reduced-motion:no-preference){.celebration-checkmark__svg.svelte-1a9hufs{animation:svelte-1a9hufs-checkmark-pop .6s ease-out forwards,svelte-1a9hufs-checkmark-fade 1.5s ease-out forwards}.celebration-checkmark__circle.svelte-1a9hufs{stroke-dasharray:176;stroke-dashoffset:176;animation:svelte-1a9hufs-checkmark-draw-circle .4s ease-out .1s forwards}.celebration-checkmark__tick.svelte-1a9hufs{stroke-dasharray:40;stroke-dashoffset:40;animation:svelte-1a9hufs-checkmark-draw-tick .3s ease-out .4s forwards}}@media(prefers-reduced-motion:reduce){.celebration-checkmark__svg.svelte-1a9hufs{animation:none}.celebration-checkmark__circle.svelte-1a9hufs,.celebration-checkmark__tick.svelte-1a9hufs{stroke-dasharray:none;stroke-dashoffset:0}}@keyframes svelte-1a9hufs-checkmark-pop{0%{transform:scale(.3);opacity:0}50%{transform:scale(1.1);opacity:1}to{transform:scale(1);opacity:1}}@keyframes svelte-1a9hufs-checkmark-fade{0%,70%{opacity:1}to{opacity:0}}@keyframes svelte-1a9hufs-checkmark-draw-circle{to{stroke-dashoffset:0}}@keyframes svelte-1a9hufs-checkmark-draw-tick{to{stroke-dashoffset:0}}.confetti-container.svelte-1a9hufs{position:fixed;top:0;left:0;width:100vw;height:100vh;pointer-events:none;z-index:999;overflow:hidden}.confetti-piece.svelte-1a9hufs{position:absolute;top:-10px;left:var(--x);width:var(--size);height:calc(var(--size) * 1.5);background:var(--color);border-radius:2px}@media(prefers-reduced-motion:no-preference){.confetti-piece.svelte-1a9hufs{animation:svelte-1a9hufs-confetti-fall 2.5s ease-out var(--delay) forwards}}@media(prefers-reduced-motion:reduce){.confetti-piece.svelte-1a9hufs{display:none}}@keyframes svelte-1a9hufs-confetti-fall{0%{transform:translateY(0) translate(0) rotate(0);opacity:1}to{transform:translateY(100vh) translate(var(--drift)) rotate(var(--rotation));opacity:0}}.milestone-backdrop.svelte-1a9hufs{position:fixed;inset:0;background:#0006;z-index:1001;display:flex;align-items:center;justify-content:center;padding:16px}@media(prefers-reduced-motion:no-preference){.milestone-backdrop.svelte-1a9hufs{animation:svelte-1a9hufs-milestone-fade-in .2s ease-out}.milestone-modal.svelte-1a9hufs{animation:svelte-1a9hufs-milestone-slide-up .3s ease-out}}.milestone-modal.svelte-1a9hufs{background:var(--color-bg-surface, #fff);border-radius:var(--radius-lg, 12px);padding:32px 24px;max-width:360px;width:100%;text-align:center;box-shadow:0 20px 60px #0003}.milestone-modal__icon.svelte-1a9hufs{margin-bottom:16px}.milestone-modal__title.svelte-1a9hufs{font-size:20px;font-weight:700;color:var(--color-text-primary, #111827);margin-bottom:8px}.milestone-modal__message.svelte-1a9hufs{font-size:15px;line-height:1.5;color:var(--color-text-secondary, #4b5563);margin-bottom:24px}.milestone-modal__btn.svelte-1a9hufs{display:inline-flex;align-items:center;justify-content:center;min-height:48px;min-width:160px;padding:12px 24px;font-size:15px;font-weight:600;font-family:inherit;color:#fff;background:var(--brand-600, #1a56db);border:none;border-radius:var(--radius-md, 8px);cursor:pointer;transition:background .15s}.milestone-modal__btn.svelte-1a9hufs:hover{background:var(--brand-700, #1545b0)}@keyframes svelte-1a9hufs-milestone-fade-in{0%{opacity:0}to{opacity:1}}@keyframes svelte-1a9hufs-milestone-slide-up{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.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}.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}.picker.svelte-16twfn9{text-align:center}.picker__subtitle.svelte-16twfn9{font-size:14px;color:var(--color-text-secondary);margin:8px auto 24px;max-width:480px}.picker__start.svelte-16twfn9{display:block;width:100%;max-width:320px;margin:0 auto 32px;min-height:56px;font-size:17px;font-weight:600;justify-content:center}.picker__details.svelte-16twfn9{max-width:480px;margin:0 auto}.picker__summary.svelte-16twfn9{cursor:pointer;color:var(--color-text-tertiary, var(--color-text-secondary));text-align:center;padding:12px;min-height:48px;display:flex;align-items:center;justify-content:center;font-size:14px}.picker__summary.svelte-16twfn9:hover{color:var(--brand-600)}.picker__sections.svelte-16twfn9{margin-top:16px;display:flex;flex-direction:column;gap:20px}.picker__section-heading.svelte-16twfn9{font-weight:700;color:var(--color-text-secondary);margin-bottom:8px;text-transform:uppercase;letter-spacing:.04em;font-size:12px}.picker__topic-list.svelte-16twfn9{display:flex;flex-wrap:wrap;gap:8px}.picker__chip.svelte-16twfn9{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;min-height:48px;font-size:14px;border:1px solid var(--color-border);border-radius:var(--radius-md, 8px);background:var(--color-bg-surface);color:var(--color-text-primary);cursor:pointer;transition:border-color .15s,background .15s;font-family:inherit}.picker__chip.svelte-16twfn9:hover,.picker__chip.svelte-16twfn9:focus-visible{border-color:var(--brand-600);background:var(--brand-50, #f0f4ff)}.picker__chip.svelte-16twfn9:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}.picker__chip-count.svelte-16twfn9{font-size:12px;color:var(--color-text-muted);background:var(--gray-100, #f3f4f6);padding:2px 6px;border-radius:10px}.practice-center.svelte-hfty8b{text-align:center;padding:80px 20px}.practice-center.svelte-hfty8b h2:where(.svelte-hfty8b){font-size:24px;font-weight:700;color:var(--color-text-primary);margin-bottom:8px}.practice-center__actions.svelte-hfty8b{display:flex;gap:12px;justify-content:center;margin-top:24px;flex-wrap:wrap}.practice-center__actions.svelte-hfty8b .btn:where(.svelte-hfty8b){min-height:48px;min-width:160px}.mode-tabs.svelte-hfty8b{display:flex;gap:4px;margin:0 auto 24px;max-width:320px;background:var(--gray-100, #f3f4f6);border-radius:var(--radius-md, 8px);padding:4px}.mode-tab.svelte-hfty8b{flex:1;padding:10px 16px;border:none;border-radius:var(--radius-sm, 6px);background:transparent;font-size:14px;font-weight:600;color:var(--color-text-secondary);cursor:pointer;transition:background .15s,color .15s;font-family:inherit;min-height:44px}.mode-tab--active.svelte-hfty8b{background:var(--color-bg-surface, #fff);color:var(--color-text-primary);box-shadow:0 1px 3px #0000001a}.mode-tab.svelte-hfty8b:not(.mode-tab--active):hover{color:var(--color-text-primary)}.session-layout.svelte-hfty8b{max-width:640px;margin:0 auto;padding:0 16px}.progress-header.svelte-hfty8b{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:13px;font-weight:600}.progress-label.svelte-hfty8b{color:var(--color-text-secondary)}.progress-count.svelte-hfty8b{color:var(--color-text-primary)}.progress-bar.svelte-hfty8b{height:4px;background:var(--gray-200, #e5e7eb);border-radius:2px;margin-bottom:24px;overflow:hidden}.progress-bar__fill.svelte-hfty8b{height:100%;background:var(--brand-600);border-radius:2px;transition:width .3s ease}.next-btn.svelte-hfty8b{width:100%;min-height:48px;justify-content:center;font-size:15px;margin-top:24px}.hint.svelte-hfty8b{text-align:center;font-size:12px;margin-top:8px}@media(max-width:480px){.session-layout.svelte-hfty8b{padding:0 8px}}