@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700;800&display=swap');
:root{--paper:#f7f7f0;--ink:#162820;--muted:#777f76;--line:#dfE3d9;--green:#18362e;--dark:#112d26;--lime:#d3ed78;--purple:#cbb8fa;--white:#f4f7ee}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Noto Sans KR',sans-serif;font-size:14px;letter-spacing:-.025em}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.44}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #93ab46;outline-offset:4px}button:hover:not(:disabled){filter:brightness(.97)}.ph{font-size:23px;font-weight:400;line-height:1}button .ph{pointer-events:none}.topbar{height:76px;display:flex;align-items:center;border-bottom:1px solid var(--line);background:var(--paper);padding-right:30px;position:relative;z-index:2}.brand{width:84px;flex-shrink:0;border:0;background:none;display:grid;place-content:center;text-align:center;gap:1px}.brand strong{font-size:23px;font-weight:800;letter-spacing:-2px}.brand small{letter-spacing:3px;font-size:9px;font-weight:700;margin-left:2px}.breadcrumb{border-left:1px solid var(--line);padding:3px 26px;display:flex;gap:13px;align-items:center;font-size:15px;font-weight:600}.breadcrumb em{font-style:normal;color:#9bA397}.toptrack{display:flex;align-items:center;gap:6px;margin:auto}.trackunit{display:flex;align-items:center;gap:8px;font-size:11px;white-space:nowrap;color:#899189}.trackunit b{border-radius:50%;background:#dfe4dc;display:grid;place-content:center;width:21px;height:21px;font-size:10px}.trackunit.current{color:var(--ink);font-weight:700}.trackunit.current b{background:var(--ink);color:var(--paper)}.trackunit.done b{background:var(--lime);color:var(--ink)}.trackline{width:14px;height:1px;background:#d9ded5}.exit{background:none;border:0;display:flex;gap:10px;align-items:center;color:#757e73;font-size:12px}.layout{display:flex;min-height:calc(100svh - 76px)}.rail{width:84px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;border-right:1px solid var(--line);padding:25px 8px 20px;gap:18px;background:var(--paper)}.rail button{width:64px;min-height:65px;border:0;background:none;border-radius:9px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;font-size:10px;color:#7c8579}.rail button.active{background:#e8efcf;color:#263b26}.rail .railbottom{margin-top:auto}.lesson{display:grid;grid-template-columns:minmax(420px,1fr) minmax(350px,390px);width:100%;min-height:calc(100svh - 76px)}.lab{background:var(--dark);color:var(--white);display:flex;flex-direction:column;padding:26px 30px 21px;min-width:0;min-height:640px}.labheading{display:flex;align-items:flex-start;justify-content:space-between;gap:15px}.labheading strong{font-family:monospace;font-weight:400;letter-spacing:1.8px;font-size:11px}.labheading p{color:#8ea89b;font-size:11px;margin:7px 0}.conditions{font-size:10px;display:flex;align-items:center;gap:5px;color:#adBdaf;white-space:nowrap}.conditions .ph{font-size:15px}.stage{position:relative;flex:1;min-height:310px}.stage svg{height:100%;width:100%;position:absolute;inset:0;overflow:visible;touch-action:none}.stagehint{position:absolute;bottom:1px;left:0;right:0;display:flex;justify-content:center;gap:7px;font-size:10px;color:#839d8f;pointer-events:none}.stagehint .ph{font-size:14px}.tracewrap{border-top:1px solid #345046;border-bottom:1px solid #345046;padding:14px 0 9px;margin-top:13px}.tracetitle{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11px;margin-bottom:4px}.legend{font-size:10px;display:flex;gap:17px;color:#b1c1b6}.legend span::before{content:'';display:inline-block;width:17px;height:2px;background:var(--lime);margin-right:7px;vertical-align:middle}.legend span:last-child::before{background:var(--purple)}.trace{display:block;width:100%;height:104px}.controls{display:flex;gap:18px;align-items:center;padding-top:16px}.play{width:45px;height:45px;border:1px solid #bacaba;border-radius:50%;background:none;color:white;display:grid;place-items:center;flex-shrink:0}.play .ph{font-size:19px}.clock{min-width:65px;display:flex;flex-direction:column;gap:4px}.clock b{font:17px monospace;letter-spacing:-1px}.clock small{font-size:9px;color:#8ca496}.divider{height:42px;width:1px;background:#385247}.sliders{display:grid;gap:9px;flex:1}.sliderrow{display:flex;align-items:center;gap:10px;font-size:10px}.sliderrow label{min-width:32px;color:#b8cbbd}.sliderrow output{font:11px monospace;width:52px;text-align:right;color:#dce6d8}.sliderrow input{width:100%;min-width:35px;accent-color:var(--purple);height:3px}.reset,.speed{background:none;border:1px solid #345046;padding:9px 10px;border-radius:5px;color:#b5c6b8;font-size:10px}.reset .ph{font-size:17px}.modelnote{margin-top:14px;color:#7b9887;font-size:9px;display:flex;justify-content:space-between}.sheet{padding:32px 32px 24px;display:flex;flex-direction:column;background:var(--paper);min-height:640px}.stepmeta{display:flex;align-items:center;justify-content:space-between;font-size:11px;font-weight:600;letter-spacing:.04em;color:#778070;margin-bottom:22px}.tag{border:1px solid #d3dacb;border-radius:4px;padding:4px 6px;font-size:9px;font-weight:400;letter-spacing:0}.sheet h1{font-size:28px;line-height:1.45;letter-spacing:-1.3px;margin:0 0 20px;font-weight:700;word-break:keep-all}.intro{font-size:13px;line-height:1.9;color:#626f61;margin:0 0 24px;word-break:keep-all}.intro strong{color:var(--ink);font-weight:600}.answers{display:flex;flex-direction:column;gap:10px}.answer{display:flex;align-items:center;gap:13px;text-align:left;border:1px solid #dce1d5;border-radius:6px;background:transparent;padding:17px 14px;min-height:63px}.answer .radio{width:18px;height:18px;border:1px solid #929c8c;border-radius:50%;flex-shrink:0}.answer.selected{border:1.5px solid #526744;background:#eff3e6;padding:16.5px 13.5px}.answer.selected .radio{border:5px solid #526744;background:var(--paper)}.answer strong{font-size:12px;font-weight:600;display:block;line-height:1.6}.answer small{display:block;color:#8d9487;font-size:10px;margin-top:4px}.feedback{margin-top:19px;border-left:3px solid #a9bd67;background:#edf1df;padding:13px 14px;line-height:1.8;color:#42503a;font-size:12px}.feedback.wrong{background:#f6eee0;border-color:#c39959;color:#826332}.feedback strong{display:block;font-size:13px;margin-bottom:4px}.hint{font-size:11px;color:#839076;background:none;border:0;display:flex;gap:7px;align-items:center;padding:12px 0;width:max-content}.hint .ph{font-size:16px}.hinttext{font-size:11px;color:#777f70;line-height:1.8;border-top:1px solid var(--line);padding-top:10px}.sheetfooter{margin-top:auto;padding-top:24px}.primary{background:var(--lime);border:0;border-radius:5px;padding:16px 18px;font-weight:600;font-size:13px;width:100%;display:flex;align-items:center;justify-content:space-between;color:#23361e}.primary .ph{font-size:19px}.footnote{font-size:9px;color:#949d8d;margin-top:12px;text-align:center}.secondary{background:none;border:1px solid #d8decf;border-radius:5px;padding:11px 14px;font-size:12px}.instruction{display:flex;align-items:flex-start;gap:11px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:17px 0;line-height:1.8;color:#66745f;font-size:12px}.instruction .ph{font-size:21px;color:#657a42;margin-top:2px}.measuretable{width:100%;border-collapse:collapse;font-size:12px;margin-top:17px}.measuretable th{text-align:left;font-size:10px;color:#88917f;font-weight:400;padding:0 0 12px;border-bottom:1px solid var(--line)}.measuretable td{padding:13px 0;border-bottom:1px solid var(--line)}.measuretable td:last-child{text-align:right;font-family:monospace;font-size:15px}.swatch{width:8px;height:8px;display:inline-block;background:var(--lime);border:1px solid #aec458;border-radius:50%;margin-right:8px}.swatch.purple{background:var(--purple);border-color:#af9dd8}.target{padding:20px 0;margin:4px 0 20px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.target span{font-size:11px;color:#7a8471}.target strong{font-family:monospace;font-size:30px;font-weight:400}.target small{font-size:13px}.formula{font:25px Georgia,serif;background:#edf0e4;padding:24px 16px;text-align:center;margin:18px 0;border-radius:4px}.formula small{display:block;font:10px 'Noto Sans KR',sans-serif;margin-top:12px;color:#7c8771}.massbuttons{display:flex;gap:8px;margin-top:15px}.massbuttons button{flex:1;border:1px solid #d2d9c9;background:none;border-radius:5px;padding:13px 5px;font-size:11px}.massbuttons button.selected{background:#e7ebdb;border-color:#5a7045}.view{padding:43px 52px;width:100%;min-height:calc(100svh - 76px);overflow:auto}.viewintro{display:flex;align-items:center;justify-content:space-between;margin-bottom:35px}.eyebrow{font:10px monospace;letter-spacing:2px;color:#819071}.view h1{font-size:30px;font-weight:600;letter-spacing:-1px;margin:12px 0}.view p{color:#7b8674;line-height:1.9;font-size:12px}.smallstat{display:flex;gap:35px;text-align:center}.smallstat strong{display:block;font:28px monospace}.smallstat span{font-size:10px;color:#909b87}.coursegrid{display:grid;grid-template-columns:1.2fr 1fr;gap:42px}.coursefeature{background:var(--dark);padding:30px;color:var(--paper);display:flex;flex-direction:column;min-height:380px;position:relative;overflow:hidden;border-radius:8px}.coursefeature .eyebrow{color:#9bb090}.coursefeature h2{font-size:24px;margin:15px 0 8px;font-weight:500;z-index:1}.coursefeature p{color:#9aB19e;max-width:260px;z-index:1}.coursefeature .primary{margin-top:auto;z-index:1;max-width:240px}.miniwave{height:120px;width:100%;margin:10px 0 20px;opacity:.9}.coursepath h2,.sectionheading{font-size:15px;font-weight:600;margin:3px 0 16px}.pathrow{border:0;border-bottom:1px solid var(--line);background:none;display:flex;text-align:left;align-items:center;padding:17px 0;gap:15px;width:100%}.pathnumber{font:11px monospace;border:1px solid #d5dcce;border-radius:50%;width:31px;height:31px;display:grid;place-content:center;flex-shrink:0}.pathrow.done .pathnumber{background:#e3edc6;border-color:#e3edc6}.pathrow strong{font-size:12px;display:block;font-weight:500}.pathrow small{font-size:10px;color:#8c9683;display:block;margin-top:6px}.pathrow .ph{margin-left:auto;font-size:17px;color:#839078}.pathrow.locked{opacity:.45}.coursebottom{margin-top:35px;border-top:1px solid var(--line);padding-top:25px;display:flex;align-items:center;justify-content:space-between}.coursebottom p{margin:0}.notelist{max-width:850px}.noterow{display:grid;grid-template-columns:48px 1fr auto;gap:19px;padding:25px 0;border-bottom:1px solid var(--line);align-items:start}.noterow .number{font:19px Georgia,serif;color:#9aa88b}.noterow h2{font-size:17px;margin:0 0 10px}.noterow p{font-size:13px;margin:0;max-width:610px}.noterow .secondary{font-size:10px}.empty{padding:55px 0;max-width:500px}.empty .ph{font-size:43px;color:#95a280}.complete{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:65px;align-items:center;padding:55px 80px}.completeart{background:var(--dark);color:var(--lime);border-radius:50%;aspect-ratio:1;max-width:390px;display:grid;place-content:center;text-align:center}.completeart .ph{font-size:85px;margin-bottom:15px}.completeart strong{font:45px Georgia,serif}.completeart span{color:#aabc9f;font-size:10px;letter-spacing:3px;margin-top:17px}.complete h1{font-size:32px;line-height:1.5;margin:12px 0}.complete p{color:#7d8772;font-size:13px;line-height:2}.resultstats{display:flex;gap:40px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;margin:25px 0}.resultstats strong{font:25px monospace}.resultstats span{display:block;font-size:10px;color:#839075;margin-top:8px}.complete .secondary{width:100%;margin-top:10px}.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#263d2c;color:var(--paper);padding:13px 25px;border-radius:6px;box-shadow:0 7px 20px #0002;z-index:8;font-size:12px}.settingsdialog{border:0;border-radius:10px;padding:32px;background:var(--paper);color:var(--ink);max-width:420px;box-shadow:0 20px 80px #0003}.settingsdialog::backdrop{background:#0d251e66}.settingsdialog h2{margin:0 0 18px;font-size:21px}.settingsdialog p{font-size:12px;line-height:1.8;color:#7b866e}.settingsdialog .secondary{margin:10px 0}.settingsdialog .primary{margin-top:16px}.settingsdialog label{display:flex;gap:12px;align-items:center;font-size:13px;margin:22px 0}.buttonrow{display:flex;gap:10px}.mobileprogress{display:none}
@media(min-width:1500px){.lesson{grid-template-columns:1fr 450px}.sheet{padding:43px 43px 30px}.sheet h1{font-size:32px}.lab{padding:30px 42px}.stage{min-height:390px}.trace{height:130px}.sheet .intro{font-size:14px}.answer{padding:21px 17px}.answer.selected{padding:20.5px 16.5px}.answer strong{font-size:14px}}
@media(max-width:1100px){.trackunit span{display:none}.toptrack{gap:5px}.breadcrumb{font-size:13px;padding:3px 18px}.lesson{grid-template-columns:minmax(360px,1fr) 330px}.lab{padding:23px 22px 18px}.sheet{padding:29px 25px 22px}.sheet h1{font-size:25px}.controls{gap:12px}.clock{min-width:54px}.rail,.brand{width:72px}.rail button{width:57px}.view{padding:35px}.complete{padding:45px;gap:45px}}
@media(max-width:850px){.breadcrumb{border:0}.topbar{height:64px;padding-right:15px}.toptrack{display:none}.exit span{display:none}.exit{margin-left:auto}.layout{min-height:calc(100svh - 64px)}.rail{width:61px;padding:17px 4px;gap:12px}.rail button{width:52px;min-height:58px;font-size:9px}.brand{width:61px}.brand strong{font-size:21px}.lesson{grid-template-columns:1fr;min-height:0}.lab{min-height:470px;height:52svh;padding:20px 23px 14px}.stage{min-height:200px}.trace{height:70px}.tracewrap{margin-top:8px;padding:9px 0 5px}.controls{padding-top:12px}.sheet{min-height:500px;padding:27px 30px 25px}.sheet h1{font-size:25px;max-width:460px}.intro{max-width:510px}.sheetfooter{padding-top:20px}.answers{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.answer{padding:14px 10px;gap:8px;align-items:start}.answer.selected{padding:13.5px 9.5px}.answer strong{font-size:11px}.answer small{font-size:9px}.answer .radio{width:15px;height:15px;margin-top:3px}.view{padding:30px}.coursegrid{grid-template-columns:1fr}.coursefeature{min-height:320px}.coursepath{margin-top:0}.viewintro{align-items:flex-start;gap:20px}.smallstat{gap:20px}.view h1{font-size:26px}.complete{padding:30px;grid-template-columns:1fr;gap:22px}.completeart{max-width:230px;margin:auto;width:100%}.completeart .ph{font-size:50px}.completeart strong{font-size:30px}.completeart span{font-size:8px}.complete h1{font-size:27px}.mobileprogress{display:block;font:11px monospace;margin-left:auto;color:#859075;margin-right:20px}}
@media(max-width:520px){.breadcrumb{font-size:11px;gap:7px;padding-left:10px}.breadcrumb span:first-child{display:none}.breadcrumb em{display:none}.topbar{height:60px}.brand{width:57px}.rail{width:51px;padding:16px 2px}.rail button{width:45px;min-height:54px;font-size:8px;gap:7px}.rail .ph{font-size:20px}.lab{min-height:395px;height:49svh;padding:16px 15px 12px}.labheading strong{font-size:9px}.labheading p{font-size:9px;margin-top:5px}.conditions{font-size:8px;gap:3px}.conditions .ph{font-size:12px}.stage{min-height:162px}.stagehint{font-size:8px}.stagehint .ph{font-size:12px}.tracetitle{font-size:9px}.legend{font-size:8px;gap:9px}.legend span::before{width:10px;margin-right:4px}.trace{height:57px}.tracewrap{margin-top:6px}.play{width:34px;height:34px}.play .ph{font-size:15px}.clock{min-width:47px}.clock b{font-size:13px}.clock small{font-size:7px}.controls{gap:9px;padding-top:10px}.divider{display:none}.sliders{gap:8px}.sliderrow{gap:5px;font-size:9px}.sliderrow label{min-width:12px}.sliderrow output{font-size:9px;width:39px}.reset{padding:6px}.reset .ph{font-size:15px}.modelnote{margin-top:9px;font-size:7px}.modelnote span:last-child{display:none}.sheet{min-height:490px;padding:24px 20px 20px}.sheet h1{font-size:23px;letter-spacing:-1px;margin-bottom:14px}.stepmeta{margin-bottom:15px}.intro{font-size:12px;line-height:1.9;margin-bottom:20px}.answers{display:flex}.answer{align-items:center;min-height:52px;padding:12px}.answer.selected{padding:11.5px}.answer strong{font-size:11px}.answer small{display:none}.answer .radio{margin:0}.primary{padding:14px;font-size:12px}.view{padding:25px 20px}.view h1{font-size:23px}.smallstat{display:none}.coursefeature{padding:25px;min-height:310px}.coursefeature h2{font-size:21px}.coursebottom{align-items:flex-start;gap:20px;flex-direction:column}.noterow{grid-template-columns:22px 1fr;gap:10px}.noterow .secondary{grid-column:2;width:max-content}.noterow h2{font-size:15px}.noterow p{font-size:12px}.complete{padding:25px}.completeart{max-width:190px}.complete h1{font-size:25px}.resultstats{gap:25px}.resultstats strong{font-size:20px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

@media(min-width:851px){.layout{height:calc(100svh - 76px);min-height:0}.lesson{height:100%;min-height:0}.lab{min-height:0}.stage{min-height:160px}.sheet{min-height:0;overflow-y:auto}.view{min-height:0}.complete{overflow:auto}}

h1,h2,p{word-break:keep-all}.sliderrow input.numberinput{width:46px;min-width:46px;height:23px;background:transparent;border:1px solid #395546;border-radius:3px;color:#dce6d8;font:10px monospace;text-align:center;padding:2px;appearance:textfield;-moz-appearance:textfield}.numberinput::-webkit-inner-spin-button,.numberinput::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.sliderrow .unit{font:9px monospace;margin-left:-7px;color:#a7bca9}.numberinput:disabled{border-color:transparent}.answer.selected:disabled{opacity:.85}
@media(min-width:1250px){.lesson{grid-template-columns:minmax(420px,1fr) 35%}.sheet{padding:36px clamp(32px,2.7vw,43px) 28px}.sheet h1{font-size:clamp(30px,2.4vw,37px);line-height:1.45}.intro{font-size:14px;line-height:1.95;margin-bottom:28px}.answer{padding:19px 15px;min-height:76px}.answer.selected{padding:18.5px 14.5px}.answer strong{font-size:14px}.answer small{font-size:11px}.stepmeta{font-size:12px;margin-bottom:28px}.lab{padding:29px 32px 23px}.trace{height:124px}.tracetitle{font-size:12px}.primary{padding:18px;font-size:14px}}
@media(min-width:851px){.sheetfooter{position:sticky;bottom:-24px;background:var(--paper);z-index:2;padding-top:16px;padding-bottom:9px;box-shadow:0 -9px 0 var(--paper)}}