@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');
:root{--ink:#213b35;--muted:#5f6d61;--teal:#216e56;--line:#d5dacd;--surface:#fffef9;--paper:#f6f7ef;--mint:#e5efdf;--start:#17689b;--start-bg:#e3eff6;--stop:#b34c31;--stop-bg:#f9e9df;--step:#7550a0;--step-bg:#eee7f7;--mono:'IBM Plex Mono',Consolas,monospace;--sans:'DM Sans','Segoe UI',sans-serif;--text-body:1.125rem;--text-control:1rem;--text-meta:.875rem;font-family:var(--sans);font-size:16px;color:var(--ink);background:var(--paper);font-synthesis:none;font-variant-numeric:tabular-nums;color-scheme:light}
*{box-sizing:border-box;scrollbar-color:#9aaa8d #eef0e5;scrollbar-width:thin}
body{margin:0;font-size:var(--text-body);line-height:1.6}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:#24786224}button,a{touch-action:manipulation}button{cursor:pointer;color:var(--ink)}a{color:inherit;text-underline-offset:.2em}button:disabled{cursor:default;opacity:.55}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid #4a9475;outline-offset:4px}
button,input,select,textarea{border-radius:7px}button{transition:background-color .15s,border-color .15s}button:hover:not(:disabled){background-color:#e6efdf}button:active:not(:disabled){background-color:#d6e6ce}[hidden]{display:none!important}::selection{background:#c7ddbb;color:#183c2a}input,textarea{caret-color:var(--teal)}h1,h2,h3{line-height:1.25;text-wrap:balance}p{max-width:72ch}code{font-family:var(--mono)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-100px;left:20px;padding:12px 18px;background:var(--surface);z-index:100}.skip-link:focus{top:10px}
.sidebar{position:fixed;inset:0 auto 0 0;width:240px;background:#142f2a;color:#e4eddf;padding:32px 22px 24px;display:flex;flex-direction:column;z-index:20;overflow-y:auto}.brand{display:flex;align-items:center;gap:9px;text-decoration:none;font-size:24px;font-weight:700;letter-spacing:-.03em}.brand-mark{font-family:var(--mono);font-size:28px;color:#c5e0b9;letter-spacing:-4px;width:39px}.brand-light{font-weight:400;color:#c2d1c2}.brand small{display:block;font-size:13px;font-weight:400;letter-spacing:0;color:#b4c7b8;margin-top:2px}.course-label{font-size:13px;margin:32px 0 22px;color:#b5c8b9}
.lesson-nav{display:flex;flex-direction:column;gap:9px}.lesson-nav a{padding:12px 10px;display:flex;align-items:center;gap:13px;font-size:16px;text-decoration:none;border:1px solid transparent;color:#c7d6c9;border-radius:8px}.lesson-nav a:hover{background:#25473b;color:white}.lesson-nav a.active{background:#314e3f;color:#f1f7e7;border-color:#526949}.nav-icon{font-family:var(--mono);font-size:19px;width:30px;color:#a9c9ae}.sidebar-note{padding:24px 10px;margin-top:18px}.sidebar-note p{font-size:18px;line-height:1.6;margin:0 0 18px;color:#e2ead8}.sidebar-note em{font-family:Georgia,serif;font-size:20px;color:#cfddba}.sidebar-note small{font-size:14px;line-height:1.8;color:#b7cbbb}
.sidebar-bottom{margin-top:auto;padding:30px 10px 0}.lesson-progress{display:flex;gap:6px;margin-bottom:10px}.lesson-progress i{height:4px;background:#476352;flex:1;border-radius:4px}.lesson-progress i.seen{background:#b7d397}.sidebar-bottom>span{font-size:13px;color:#bfd0bf}.sidebar-bottom button{display:block;border:0;background:transparent;color:#bfd0bf;padding:12px 0 0;font-size:14px}.sidebar-bottom button:hover{background:transparent;color:white}.sidebar-bottom button[aria-pressed=true]{color:#e6eeb9}
main{margin-left:240px;padding:0 38px;max-width:1680px;min-width:0}.topbar{min-height:64px;display:flex;justify-content:space-between;align-items:center;gap:15px;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}#top-lesson{color:var(--teal);font-weight:600}.intro{padding:27px 0 24px}.intro h1{font-size:36px;letter-spacing:-.03em;font-weight:500;margin:0}.intro h1 em{font-family:Georgia,serif;font-weight:400;color:#416e51}.intro p{font-size:17px;color:var(--muted);margin:9px 0 0}.topic-tabs{display:flex;gap:30px;border-bottom:1px solid var(--line);overflow:auto}.topic-tabs a{font-size:16px;text-decoration:none;padding:13px 0 15px;color:#5a6c5a;border-bottom:3px solid transparent;white-space:nowrap}.topic-tabs a:hover{color:#183e2a}.topic-tabs a.active{color:var(--teal);border-color:var(--teal);font-weight:700}
.lesson-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:27px 0 22px}.lesson-heading>div{min-width:0}h2{font-size:28px;font-weight:600;letter-spacing:-.025em;margin:0}.lesson-heading p{font-size:17px;color:var(--muted);margin:9px 0 0;line-height:1.65;max-width:66ch}.text-button{font-size:14px;border:0;background:transparent;color:#416449;white-space:nowrap;padding:9px 0;text-decoration:underline;text-underline-offset:4px}.text-button:hover{background:transparent;color:#183e2a}
.source-panel{border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:19px 22px;margin-bottom:20px}.source-top{display:flex;justify-content:space-between;align-items:center;gap:15px}.source-top>label{font-size:16px;font-weight:600}.segmented{display:flex;background:#edf0e4;border:1px solid #dce0d2;border-radius:7px;padding:3px;gap:3px}.segmented button{font-size:14px;padding:5px 13px;border:0;background:transparent;color:#53644e;border-radius:5px}.segmented button.selected{background:#fffef9;color:#203f2c;font-weight:600}
#sequence-form{display:flex;align-items:center;gap:13px;margin:17px 0}.code-variable{font:17px var(--mono);color:var(--teal);white-space:nowrap}#sequence-input{background:#f8faf2;font:17px/1.6 var(--mono);width:100%;min-width:0;border:1px solid var(--line);color:#3c5535;padding:8px 10px}.small-button{font-size:14px;min-height:44px;border:1px solid #a9b9a0;background:#eff3e6;padding:8px 13px;white-space:nowrap}.source-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:14px}.source-bottom i{font-style:normal;margin:0 7px;color:#829076}.examples{display:flex;gap:7px;align-items:center;flex-wrap:wrap}.examples>span{font-size:13px;margin-right:3px}.examples button{font-size:13px;background:transparent;border:1px solid #cbd5bf;border-radius:5px;color:#506343;padding:4px 9px}
.playground{border:1px solid var(--line);border-radius:12px 12px 0 0;background:var(--surface);overflow:hidden}.playground-top{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:18px 22px 0}.playground-top p{font-size:15px;color:var(--muted);margin:0}.toggle-label{display:flex;align-items:center;gap:8px;font-size:14px;line-height:1.4;color:#526c4d;cursor:pointer}.toggle-label input{accent-color:var(--teal);height:17px;width:17px}.array-stage{overflow:auto;padding:24px 22px 15px;scrollbar-width:auto}.index-caption{font-size:14px;color:#52644d;text-align:center}.array-track{display:flex;justify-content:center;gap:10px;min-width:100%;width:max-content;padding:13px 4px}
.array-cell{position:relative;width:68px;flex:0 0 68px;text-align:center;display:flex;flex-direction:column;align-items:stretch;background:transparent;border:0;padding:0;color:var(--ink);border-radius:8px}.array-cell .positive,.array-cell .negative{font:16px/1.4 var(--mono);color:#52694a;display:block;margin-bottom:10px}.array-cell .negative{margin:11px 0 0;color:#765d3d;font-size:14px}.array-cell .cell-value{font:19px/1.4 var(--mono);background:#f1f5e8;border:1px solid #bdcbb0;border-radius:7px;padding:18px 3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.array-cell:hover .cell-value{background:#e2edda;border-color:#537b46}.array-cell.active .cell-value{background:#24694f;border:2px solid #16432f;color:white;padding:17px 2px}.array-cell.active .positive{color:#164c32;font-weight:600}.array-cell.active .negative{color:#184d35;font-weight:600}.array-cell .selected-label{display:block;height:22px;font:12px var(--sans);color:#235a3c;margin-top:7px;font-weight:600}.array-cell:not(.active) .selected-label{visibility:hidden}.array-cell .cell-value,.array-cell{animation:none;transition:none;box-shadow:none;transform:none}.stage-note{font-size:15px;color:#315c3e;text-align:center;margin:0;padding:0 18px 20px;min-height:40px}.hide-negative .negative,.hide-negative .negative-caption{display:none}
.execution-strip{background:#e8efdf;border:1px solid #c5d4b9;border-top:0;display:flex;align-items:center;gap:22px;padding:18px 23px;min-height:92px}.execution-strip>div{display:flex;flex-direction:column;gap:7px;min-width:0}.output-label{font:13px var(--sans);color:#45633d}#expression{font-size:18px;white-space:nowrap}.execution-arrow{color:#526b49;font-size:23px}.returned{flex:1}#result{font:19px/1.6 var(--mono);color:#205733;overflow-wrap:anywhere}.result-type{font:13px var(--mono);color:#48623c;border:1px solid #bbcdae;background:#f4f7ee;border-radius:5px;padding:4px 8px}.execution-strip.has-error{background:#faeee6;border-color:#d4ae94}.has-error #result{color:#99452e;font-size:16px}
.controls-panel{border:1px solid var(--line);border-top:0;border-radius:0 0 12px 12px;display:flex;gap:30px;align-items:center;padding:20px 22px;background:var(--surface)}.index-control{width:160px;flex-shrink:0}.index-control>label,.slider-control>label{font-size:14px;color:#4f6548;display:block;margin-bottom:10px}.stepper{display:flex;border:1px solid #acbca0;border-radius:7px;height:44px;overflow:hidden}.stepper button{width:44px;border:0;background:#eef3e5;color:#386139;font-size:20px}.stepper input{width:70px;min-width:0;border:0;background:transparent;text-align:center;font:17px var(--mono);color:#2b5530;appearance:textfield}.stepper input::-webkit-inner-spin-button{appearance:none}.slider-control{flex:1;min-width:110px}.slider-control input{width:100%;height:6px;accent-color:var(--teal);cursor:pointer;margin:8px 0 13px}.range-labels{display:flex;justify-content:space-between;font:14px var(--mono);color:#536a49}
.slice-controls{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:0 0 21px}.slice-input-group{border:1px solid var(--line);border-radius:10px;padding:15px;background:var(--surface);min-width:0}.param-heading{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:12px;flex-wrap:wrap}.param-heading>label:first-child{font-size:17px;font-weight:600}.param-heading small{font-size:13px;font-weight:400;display:block}.param-start{color:var(--start)}.param-stop{color:var(--stop)}.param-step{color:var(--step)}.slice-input-group input[type=number]{font:18px var(--mono);width:100%;padding:9px 10px;border:1px solid currentColor;background:var(--surface);color:inherit}.slice-input-group input[type=number]:disabled{color:#65715c;border-color:#bac4af;background:#f0f3e8;opacity:1}.omit-label{display:flex;align-items:center;gap:6px;font-size:14px;color:#52634b;cursor:pointer}.omit-label input{accent-color:var(--teal);height:16px;width:16px}.param-help{display:block;font-size:13px;line-height:1.5;margin-top:9px;color:#56684f}.slice-presets{grid-column:1/-1;display:flex;gap:9px;align-items:center;flex-wrap:wrap;color:var(--muted);font-size:14px}.slice-presets button{font:14px var(--mono);border:1px solid #bfcdb4;background:#f8faf2;padding:7px 11px}
.slice-board{border:1px solid var(--line);border-radius:12px 12px 0 0;background:var(--surface);overflow:hidden}.slice-board-top{padding:18px 20px;border-bottom:1px solid var(--line);display:flex;gap:14px;justify-content:space-between;align-items:center;flex-wrap:wrap}.slice-board-top h3{font-size:19px;margin:0;font-weight:600}.direction-label{font:14px var(--mono);color:var(--step)}.boundary-summary{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:17px 20px 0}.boundary-tag{display:inline-flex;gap:7px;align-items:center;font:14px/1.5 var(--mono);border:1px solid currentColor;border-radius:5px;padding:4px 9px}.start-tag{color:var(--start);background:var(--start-bg)}.stop-tag{color:var(--stop);background:var(--stop-bg)}.step-tag{color:var(--step);background:var(--step-bg)}.boundary-tag small{font:13px var(--sans)}.slice-scroll-hint{font-size:13px;color:var(--muted);padding:9px 20px 0;margin:0}.slice-scroll{overflow-x:auto;padding:16px 17px 12px;scrollbar-width:auto}.slice-table{border-collapse:separate;border-spacing:6px 10px;width:100%;table-layout:fixed;font-size:15px}.slice-table .row-label{width:160px;text-align:left;font-weight:600;line-height:1.4;position:sticky;left:0;background:var(--surface);z-index:2;padding-right:8px}.row-label small{display:block;font:13px/1.5 var(--sans);color:var(--muted);font-weight:400;margin-top:5px}.slice-table thead th:not(.row-label){font:15px var(--mono);height:57px;vertical-align:bottom;position:relative}.slice-index{display:block}.negative-index{font-size:13px;color:#795e3c;display:block;margin-top:3px}.boundary-pin{position:absolute;font:12px var(--sans);font-weight:600;top:0;left:50%;transform:translateX(-50%);white-space:nowrap;padding:1px 4px;border-radius:3px}.boundary-pin.start{color:white;background:var(--start)}.boundary-pin.stop{color:white;background:var(--stop)}.slice-table td{text-align:center;height:56px;position:relative}.source-value{display:block;border:1px solid #c8d1ba;border-radius:6px;background:#f2f5eb;padding:13px 4px;font:17px/1.5 var(--mono);white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.slice-table td.bound-start .source-value{outline:2px solid var(--start);outline-offset:2px}.slice-table td.bound-stop .source-value{outline:2px dashed var(--stop);outline-offset:2px;background:var(--stop-bg)}
.mask-range,.mask-step,.mask-result{display:flex;justify-content:center;align-items:center;min-height:44px;border-radius:5px;font:14px var(--mono);color:#65705e;background:#f4f5ee;border:1px solid #e1e5d9}.mask-range.in-range{color:var(--start);background:var(--start-bg);border-color:#b2cfe0}.mask-step.on-step{color:var(--step);background:var(--step-bg);border-color:#cbb7e3;font-weight:600}.mask-step.on-step:after{content:'';position:absolute;left:25%;right:25%;bottom:10px;height:2px;background:var(--step)}.mask-result.in-result{background:#e0efda;color:#215c37;border:2px solid #659a61;font-weight:600}.mask-result.in-result.current{background:#24694f;color:#fff;border-color:#184f37}.mask-result.waiting{color:#62725c;border-style:dashed;background:#f5f8ed}.range-row .row-label{color:var(--start)}.step-row .row-label{color:var(--step)}.result-row .row-label{color:#24633c}.slice-formula{border-top:1px solid var(--line);padding:16px 20px;background:#f2f5ea;display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:16px}.slice-formula .formula-range{color:var(--start)}.slice-formula .formula-step{color:var(--step)}.slice-formula .formula-result{color:#24633c;font-weight:600}.slice-formula code{font-size:14px;overflow-wrap:anywhere}.slice-empty{padding:27px 22px;font-size:16px;color:var(--muted)}
.playback{display:flex;justify-content:space-between;gap:15px;align-items:center;flex-wrap:wrap;padding:17px 0;font-size:14px;color:#4e6347}.playback-buttons{display:flex;gap:7px;flex-wrap:wrap}.playback button{background:var(--surface);border:1px solid #bacbb0;padding:8px 12px;font-size:14px;min-height:42px}.playback .playback-play{background:var(--teal);color:white;border-color:var(--teal);font-weight:500}.playback .playback-play:hover{background:#184f3b}.playback select{border:1px solid var(--line);background:var(--surface);color:#365731;font-size:14px;padding:6px}.playback label{display:flex;align-items:center;gap:8px}
.insight-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:24px;margin-top:24px}.insight-card,.rule-card{padding:19px 0;border-top:1px solid #c9d3bd}.insight-card h3,.rule-card h3{font-size:18px;font-weight:600;margin:0 0 10px}.insight-card p,.rule-card p{font-size:16px;line-height:1.7;color:#4f6346;margin:0 0 12px}.insight-card code{font-size:14px;overflow-wrap:anywhere;color:#345b32;white-space:pre-wrap}.rule-card code{background:#e6ebdb;border-radius:3px;padding:1px 4px;font-size:15px;color:#40552f}.rule-foot{font-size:14px;color:#596b50}
.challenge{margin:22px 0 0;border-top:1px solid var(--line);padding:24px 0;display:flex;justify-content:space-between;align-items:flex-start;gap:30px}.challenge h3{font-size:18px;margin:0 0 10px;font-weight:600}.challenge-copy>p{font:14px/1.7 var(--mono);color:#536348;margin:0}.quiz-answers{display:flex;gap:8px;flex-wrap:wrap}.quiz-answers button{font:15px var(--mono);min-width:62px;padding:10px 13px;background:var(--surface);border:1px solid #b7c7aa;border-radius:6px}.quiz-answers button.correct{background:#dfedd6;border-color:#6b9858;color:#24522a}.quiz-answers button.incorrect{background:#f8e6da;border-color:#bb896b;color:#914627}.quiz-right{min-width:240px;max-width:55%}.quiz-right>p{font-size:14px;color:#53664b;margin:10px 0 0;line-height:1.65}#next-question{font-size:14px}footer{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid var(--line);padding:23px 0 27px;color:#5d6c51;font-size:14px}footer a{font-size:14px}.error{color:#9d432d;font:15px/1.6 var(--mono);margin:14px 0 0}.empty-state{font:16px/1.7 var(--mono);color:#596d4e;padding:25px;max-width:100%;white-space:normal}
.slider-control{--range-thumb-size:20px}
.slider-control input[type=range]{appearance:none;-webkit-appearance:none;display:block;width:100%;height:6px;padding:0;border:0;border-radius:3px;background:linear-gradient(to right,var(--teal) 0,var(--teal) var(--slider-fill,50%),#c6cebf var(--slider-fill,50%),#c6cebf 100%)}
.slider-control input[type=range]::-webkit-slider-runnable-track{height:6px;border:0;border-radius:3px;background:transparent}
.slider-control input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:var(--range-thumb-size);height:var(--range-thumb-size);margin-top:-7px;border:0;border-radius:50%;background:var(--teal)}
.slider-control input[type=range]::-moz-range-track{height:6px;border:0;border-radius:3px;background:transparent}
.slider-control input[type=range]::-moz-range-thumb{width:var(--range-thumb-size);height:var(--range-thumb-size);border:0;border-radius:50%;background:var(--teal)}
.range-labels{display:block;position:relative;height:24px;margin-inline:calc(var(--range-thumb-size)/2)}
.range-labels>span{position:absolute;top:0;transform:translateX(-50%);white-space:nowrap}
#range-min{left:0}#range-max{left:100%}
.boundary-pin.coincident{color:#3e4f58;background:#eef1e8;border-top:2px solid var(--start);border-bottom:2px solid var(--stop);font-size:12px}.array-cell .selected-label{font-size:13px}
.reduced-motion *, .reduced-motion *:before,.reduced-motion *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
@media(min-width:1500px){main{padding:0 64px}.slice-table .row-label{width:180px}}
@media(max-width:1100px){.sidebar{width:216px;padding-left:16px;padding-right:16px}.brand{font-size:22px}main{margin-left:216px;padding:0 28px}.topic-tabs{gap:24px}.slice-table .row-label{width:140px}.source-panel{padding:17px}.source-bottom{gap:15px}.lesson-heading{align-items:flex-start}.execution-strip{gap:16px}}
@media(max-width:850px){.sidebar{width:190px;padding:25px 12px}.brand{font-size:20px;gap:6px}.brand-mark{font-size:24px;width:30px}.brand small{font-size:12px}.lesson-nav a{font-size:15px;padding:11px 8px;gap:7px}.nav-icon{width:28px}.sidebar-note{padding:20px 7px}.sidebar-note p{font-size:16px}.sidebar-note small{font-size:13px}.course-label{font-size:12px}main{margin-left:190px;padding:0 22px}.intro h1{font-size:32px}.intro p{font-size:16px}h2{font-size:26px}.lesson-heading{flex-direction:column;gap:7px}.lesson-heading p{font-size:16px}.topic-tabs{gap:19px}.topic-tabs a{font-size:15px}.source-top{flex-wrap:wrap}#sequence-form{flex-wrap:wrap;gap:9px}.code-variable{width:58px}#sequence-input{width:calc(100% - 70px);font-size:16px}.small-button{margin-left:67px}.playground-top{flex-wrap:wrap}.execution-strip{flex-wrap:wrap}.execution-strip #result{font-size:17px}.controls-panel{gap:20px;padding:18px}.index-control{width:150px}.slice-controls{gap:10px}.slice-input-group{padding:13px 11px}.param-heading>label:first-child{font-size:16px}.omit-label{font-size:13px}.insight-grid{grid-template-columns:1fr;gap:4px}.challenge{flex-direction:column;gap:20px}.quiz-right{max-width:100%;width:100%}.source-bottom{font-size:14px}.execution-strip .result-type{margin-left:auto}.sidebar-bottom{padding-left:7px;padding-right:7px}}
@media(max-width:680px){.sidebar{position:relative;width:100%;height:auto;inset:auto;padding:16px 20px;display:flex;flex-direction:row;align-items:center;justify-content:space-between;overflow:visible}.brand{font-size:22px}.brand-mark{font-size:27px;width:34px}.brand small{font-size:12px}.course-label{margin:0;font-size:13px}.lesson-nav,.sidebar-note,.sidebar-bottom{display:none}main{margin:0;padding:0 18px}.topbar{min-height:52px;font-size:14px}.intro{padding:24px 0 20px}.intro h1{font-size:32px}.intro p{font-size:16px;margin-top:11px}.topic-tabs{gap:23px}.topic-tabs a{font-size:15px;padding:12px 0}.lesson-heading{margin:23px 0 18px;gap:9px}h2{font-size:26px}.lesson-heading p{font-size:17px}.text-button{font-size:14px}.source-panel{padding:16px;margin-bottom:17px}.source-top{gap:11px}.source-top>label{font-size:16px}.segmented button{font-size:14px;padding:5px 10px}.source-bottom{gap:14px}.examples{gap:7px}.examples>span{width:100%}.examples button{font-size:14px;padding:5px 10px}.playground-top{padding:16px 16px 0}.playground-top p{font-size:15px}.toggle-label{font-size:14px}.array-stage{padding:20px 14px 14px}.array-track{justify-content:flex-start;gap:9px}.array-cell{width:62px;flex-basis:62px}.stage-note{font-size:15px;text-align:left;padding:0 16px 18px}.execution-strip{gap:14px;padding:17px;align-items:flex-start}#expression{font-size:17px}.execution-strip>div.returned{flex-basis:100%;order:3}.execution-arrow{margin-left:auto}.result-type{order:4}.output-label{font-size:14px}.controls-panel{flex-wrap:wrap;padding:17px;gap:20px}.index-control{width:100%}.stepper{width:160px}.slider-control{width:100%;flex-basis:100%}.index-control>label,.slider-control>label{font-size:15px}.slice-controls{gap:9px}.slice-input-group{padding:12px 10px}.param-heading{gap:9px}.param-heading>label:first-child{font-size:16px}.param-heading small{font-size:13px}.omit-label{font-size:13px}.slice-input-group input[type=number]{font-size:17px;padding:8px}.param-help{font-size:13px}.slice-presets{gap:8px;font-size:14px}.slice-presets>span{width:100%;margin-top:3px}.slice-presets button{font-size:14px;padding:7px 10px}.slice-board-top{padding:16px}.slice-board-top h3{font-size:18px}.boundary-summary{gap:9px;padding:16px 16px 0}.boundary-tag{font-size:14px;padding:4px 8px}.slice-scroll{padding:12px 8px}.slice-table .row-label{width:127px;font-size:15px}.slice-table{border-spacing:5px 9px}.row-label small{font-size:13px}.slice-table thead th:not(.row-label){font-size:15px}.source-value{font-size:17px}.boundary-pin{font-size:12px}.slice-formula{font-size:16px;padding:15px 16px;gap:9px}.slice-formula code{font-size:14px}.playback{font-size:14px;gap:15px}.playback-buttons{gap:6px;width:100%}.playback button{font-size:14px;padding:9px 10px}.playback label{margin-left:auto}.insight-grid{margin-top:20px}.insight-card p,.rule-card p{font-size:16px}.insight-card code{font-size:14px}.challenge h3{font-size:18px}.quiz-answers button{font-size:15px;flex:1}.quiz-right>p{font-size:15px}.challenge-copy>p{font-size:14px}footer{font-size:13px;gap:15px}footer a{font-size:13px}}
@media(max-width:370px){.course-label{font-size:12px}.brand{font-size:20px}.topic-tabs{gap:17px}.topic-tabs a{font-size:14px}.slice-controls{grid-template-columns:1fr}.param-heading small{display:inline;margin-left:8px}.slice-presets{grid-column:1}.slice-input-group{padding:13px}.omit-label{font-size:14px}.param-help{font-size:14px}.param-heading>label:first-child{font-size:17px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.lesson-nav .nav-icon{display:inline-flex;align-items:center;justify-content:center;flex:0 0 38px;width:38px;min-width:38px;line-height:1;white-space:nowrap;text-align:center}.lesson-nav a{align-items:center}

#expression{white-space:pre-wrap;overflow-wrap:anywhere}
.slider-control input[type=range]{height:44px;background-size:100% 6px;background-repeat:no-repeat;background-position:center;margin-block:0 4px}
.omit-label{min-height:32px}
.direction-label{min-width:0;overflow-wrap:anywhere}
:root{--stop:#a9442d}
.source-bottom i{color:var(--muted)}
@media(max-width:680px){.segmented button,.examples button,.slice-presets button{min-height:44px}.omit-label,.toggle-label{min-height:44px}}