.calculator{width:min(440px,calc(100vw - 20px));padding:20px;max-height:92dvh;overflow:auto}
.calculator header{position:relative;padding-right:38px}.calculator header h2{font-size:23px}
.calc-toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.calc-toolbar button{padding:8px 12px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink)}
.calc-toolbar [aria-pressed=true]{background:#168ed3;color:white}
#calc-input{font-size:23px;text-align:right;min-width:0;width:100%;font-variant-numeric:tabular-nums}
#calc-result{display:block;min-height:52px;text-align:right;font-size:25px;overflow-wrap:anywhere;color:var(--ink);padding:10px 0}
.calc-keys,.calc-scientific{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.calc-scientific{grid-template-columns:repeat(5,minmax(0,1fr));margin-bottom:9px}.calc-scientific[hidden]{display:none}
.calc-keys button,.calc-scientific button{min-height:45px;padding:9px 2px;border:1px solid var(--line);border-bottom:3px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);font-size:19px;touch-action:manipulation}.calc-scientific button{font-size:14px;min-height:39px}.calc-keys button.primary{background:#42bdf0;color:#102b3e}
#calc-history-list button{display:block;width:100%;padding:12px;text-align:left;overflow-wrap:anywhere;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink)}#calc-history-list small{display:block;color:var(--muted)}
.familiarity{border:0;display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.familiarity legend{margin-bottom:9px;font-weight:700}.familiarity label{border:1px solid var(--line);border-radius:12px;padding:10px;display:flex;gap:6px;align-items:center;font-size:14px}
.task-tools{flex-wrap:wrap;gap:4px 15px}.task-tools button{font-size:14px}.task-header>.lumi-rig{width:35px}.task-sheet{max-height:90dvh;overflow-y:auto}.task-sheet pre{white-space:pre-wrap;overflow-wrap:anywhere;font-family:inherit}
.math-typeset{display:inline-block;vertical-align:middle;max-width:100%;padding:2px 1px}.math-typeset math{font-size:1.1em}.math-block pre{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8}.math-block.code pre{white-space:pre;overflow:auto;line-height:1.5}
#tutor-answer,#reasoning-feedback{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8}.solution li{line-height:1.9}
.trail-label{max-width:155px;font-size:12px;line-height:1.3;text-align:center}.lumi-rig .lumi-eyes{transform-origin:130px 94px}.lumi-rig .lumi-body{animation-duration:6.8s}.lumi-rig .lumi-hand.right{animation-duration:12s}.activity-ball .lumi-body{animation-duration:6.8s}.activity-ball .kicking-foot{fill:#49c9f7;stroke:#b6f4ff;stroke-width:1.5}
.task-shell .lesson-intro{padding-top:12px}.lesson-intro>.lumi-rig{width:125px}.lesson-intro h1{font-size:26px}
@media(max-width:400px){.task-tools button{font-size:12px}.calculator{padding:15px}.trail-label{max-width:130px}}

.calculator{padding:16px;line-height:1.35}.calculator header{display:flex;align-items:center;min-height:34px}.calculator header h2{margin:0;font-size:21px}.calculator .sheet-close{position:sticky;top:0;margin-left:auto;float:right;flex:none;padding:4px 10px;min-height:34px;align-self:start}.calculator header+.micro{margin:6px 0 12px;font-size:11px}.calculator .field{gap:5px;margin:0}.calculator #calc-input{padding:8px 10px;min-height:44px;font-size:21px}.calculator #calc-result{padding:5px 0;min-height:40px;font-size:24px}.calculator .calc-keys button{min-height:38px;padding:4px}.calculator .calc-scientific button{min-height:32px;padding:3px}.calculator .calc-toolbar{margin-bottom:10px}.calculator .calc-toolbar button{padding:6px 10px;font-size:13px}.calculator .calc-keys+.micro{font-size:11px;margin:8px 0}.activity-ball{opacity:1}.activity-ball .activity-prop{top:60px}.activity-ball .lumi-ground{opacity:0}.task-sheet .math-block pre{background:none;padding:0}.task-sheet .math-block{margin:12px 0}

/* Lesson tools: quiet secondary actions, distinct calculator dock. */
.lesson-submit-row{display:flex;align-items:center;gap:14px;width:100%}.lesson-submit-row>.primary{flex:1;min-width:0}.calculator-launch{flex:0 0 58px;width:58px;height:58px;border:0;background:transparent;padding:2px;border-radius:16px;cursor:pointer;touch-action:manipulation}.calculator-launch img{display:block;width:100%;height:100%;object-fit:contain}.calculator-launch:hover{filter:brightness(1.15)}.calculator-launch:active{transform:scale(.94)}
.task-tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}.task-tools .support-button{display:flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:8px;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--ink);font-size:13px;font-weight:800;text-decoration:none}.support-button>span:first-child{display:grid;place-items:center;width:22px;height:22px;border-radius:8px;background:rgba(56,174,245,.13);color:#39b8f1;font-size:17px}.task-tools .support-button:hover{border-color:#459fd7;background:rgba(56,174,245,.1)}
.confidence,.familiarity{display:flex;gap:8px;border:0;padding:0;flex-wrap:wrap}.confidence legend,.familiarity legend{font-size:14px;line-height:1.5;margin-bottom:10px}.confidence legend span{display:block;font-size:11px;font-weight:400;color:var(--muted)}.confidence label,.familiarity label{position:relative;flex:1;padding:0;border:0;min-width:85px;cursor:pointer}.confidence input,.familiarity input{position:absolute;opacity:0;width:1px;height:1px}.confidence label>span,.familiarity label>span{display:flex;align-items:center;justify-content:center;gap:7px;min-height:48px;padding:10px 8px;border:1px solid var(--line);border-bottom-width:3px;border-radius:14px;background:var(--surface);font-size:12px;font-weight:700;color:var(--ink)}.confidence label b,.familiarity label b{font-size:17px;color:#35b8e9}.confidence input:checked+span,.familiarity input:checked+span{border-color:#31b4e5;background:rgba(49,180,229,.14)}.confidence input:focus-visible+span,.familiarity input:focus-visible+span,.calculator-launch:focus-visible,.support-button:focus-visible{outline:3px solid #9874ff;outline-offset:3px}.familiarity label{min-width:130px}.confidence-trigger{font-size:12px;color:var(--muted)}
.calculator{margin:auto 18px auto auto;border-radius:24px;border:1px solid #406783;box-shadow:0 20px 70px #0008}.calculator::backdrop{background:rgba(4,12,24,.48);backdrop-filter:blur(3px)}.calculator #calc-input{caret-color:transparent;background:var(--surface);border-radius:14px}.calculator .calc-keys button{min-height:44px}.calculator .calc-keys button:active,.calculator .calc-scientific button:active{transform:translateY(2px);border-bottom-width:1px;background:rgba(49,180,229,.2)}
.guided-step{margin:12px 0;border:1px solid var(--line);border-radius:14px;padding:12px 14px;background:var(--surface)}.guided-step summary{cursor:pointer;font-weight:800;color:var(--ink);min-height:28px}.guided-step p{line-height:1.8;margin:10px 0 0}.guided-prompt{color:var(--muted);font-size:13px;line-height:1.6}
@media(max-width:600px){.calculator{margin:auto auto 0;width:100%;max-height:94dvh;border-radius:24px 24px 0 0;padding:14px 16px max(14px,env(safe-area-inset-bottom))}.calculator .calc-keys button{min-height:40px}.task-actions .lesson-submit-row{gap:10px}.calculator-launch{flex-basis:52px;width:52px;height:52px}.familiarity label{min-width:100%;}.familiarity label>span{justify-content:flex-start;min-height:44px}.lesson-intro>.lumi-rig{width:100px}}

@media(max-width:600px){dialog.calculator{max-width:100vw;width:100vw;max-height:94dvh}}
.task-content .confidence label>span{padding:10px 8px;white-space:normal}.task-content .confidence legend{font-size:13px;margin-bottom:10px}