:root{color-scheme:light;--paper:#fff;--surface:#f4f7fc;--ink:#1c2c4c;--muted:#5b6b83;--line:#dce3ed;--blue:#3659d9;--blue-wash:#edf1ff;--teal:#127c73;--teal-wash:#e8f5f2;--rose:#a83c66;--rose-wash:#fff0f4;--amber:#876018;--amber-wash:#fff7e4;--radius:14px;font-family:Pretendard,"Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",sans-serif;font-size:15px;color:var(--ink);background:var(--surface);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select,summary{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button{color:inherit}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #6688ec;outline-offset:3px}button,input,select,textarea{border-radius:8px}button{border:0;background:none}input,select,textarea{max-width:100%;border:1px solid #cbd5e4;background:var(--paper);color:var(--ink);padding:11px 12px;line-height:1.5}textarea{resize:vertical;width:100%;min-height:76px}input:hover,select:hover,textarea:hover{border-color:#9eabc0}label{display:block;font-weight:650;font-size:13px;line-height:1.5;margin-bottom:7px}select{width:100%;text-overflow:ellipsis;padding-right:26px}h1,h2,h3,p{margin:0}h1{font-size:32px;letter-spacing:-1.5px;line-height:1.35;font-weight:750;word-break:keep-all}h2{font-size:19px;letter-spacing:-.7px;line-height:1.5}h3{font-size:15px;line-height:1.6}p{line-height:1.75;word-break:keep-all}small{font-size:12px}ul,ol{padding-left:22px;margin:12px 0}li{line-height:1.8}pre{margin:0;white-space:pre-wrap;overflow-wrap:anywhere;font:12px/1.7 ui-monospace,SFMono-Regular,Consolas,monospace}code{font:12px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace}details>summary{cursor:pointer;line-height:1.65}details[open]>summary{margin-bottom:12px}details{border-bottom:1px solid var(--line);padding:18px 0}[hidden]{display:none!important}.skip-link{position:fixed;top:8px;left:8px;z-index:100;background:white;padding:12px;transform:translateY(-150%)}.skip-link:focus{transform:none}.app-shell{display:flex;min-height:100vh}.sidebar{width:236px;flex-shrink:0;background:var(--paper);border-right:1px solid var(--line);padding:35px 20px 25px;position:sticky;top:0;height:100vh;overflow-y:auto;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:13px;line-height:1.7;padding-left:9px;margin-bottom:42px}.brand strong{font-size:20px;letter-spacing:-.6px}.brand-icon{width:39px;height:37px;background:var(--ink);border-radius:7px;position:relative;display:flex;justify-content:space-evenly;padding:0 3px;transform:rotate(-5deg)}.brand-icon:after{content:'';position:absolute;top:10px;left:0;right:0;border-top:3px solid white;transform:rotate(5deg)}.brand-icon i{width:5px;height:10px;background:white;transform:skew(-20deg)}.course-heading{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);padding:0 8px}.course-heading span:last-child{color:var(--blue);font-weight:700}progress{display:block;appearance:none;border:0;height:4px;width:calc(100% - 16px);margin:11px 8px 20px;border-radius:4px;overflow:hidden;background:var(--surface)}progress::-webkit-progress-bar{background:#e9eef6}progress::-webkit-progress-value{background:var(--blue)}progress::-moz-progress-bar{background:var(--blue)}.lesson-nav{display:flex;flex-direction:column;gap:5px}.nav-group{color:#7a879b;font-size:11px;font-weight:650;padding:18px 10px 6px}.lesson-link{display:flex;align-items:flex-start;gap:10px;text-align:left;padding:11px 9px;border-radius:9px;font-size:12px;line-height:1.65;width:100%;color:var(--muted)}.lesson-link:hover{background:var(--surface)}.lesson-link[aria-current=step]{background:var(--blue-wash);color:var(--blue);font-weight:700}.lesson-link .lesson-number{font-size:11px;color:#8795aa;flex:0 0 18px;padding-top:1px}.lesson-link[aria-current=step] .lesson-number{color:var(--blue)}.lesson-link .done-marker{color:var(--teal);margin-left:auto;flex-shrink:0}.sidebar-bottom{padding:28px 9px 0;margin-top:auto}.sidebar-bottom p{font-size:13px;margin:9px 0;color:var(--ink)}.sidebar-bottom small{font-size:10px;color:#8590a2;line-height:1.7}.book-symbol{font-size:25px;color:#95a5bf}.main-shell{min-width:0;flex:1}.topbar{height:79px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:15px;padding:0 44px;background:rgba(255,255,255,.6)}.view-nav{display:flex;height:100%;gap:28px}.view-nav button{font-size:13px;color:var(--muted);padding:0;border-radius:0;position:relative}.view-nav button[aria-current=page]{font-weight:700;color:var(--ink)}.view-nav button[aria-current=page]:after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:3px;background:var(--ink)}.local-badge{font-size:11px;display:flex;align-items:center;gap:7px;white-space:nowrap;color:var(--muted)}.local-badge>span{width:6px;height:6px;background:var(--teal);border-radius:50%}.mobile-brand,.mobile-course{display:none}main{max-width:1450px;padding:38px 44px 24px;margin:auto}.lesson-heading{display:flex;justify-content:space-between;align-items:center;gap:30px;margin-bottom:26px}.lesson-meta{font-size:12px;font-weight:650;color:var(--blue);margin-bottom:10px}.lead{color:var(--muted);font-size:14px;line-height:1.8;margin-top:12px;max-width:740px}.lesson-index{display:flex;flex-direction:column;align-items:center;min-width:106px}.lesson-index>span{font-size:67px;font-weight:350;line-height:1;letter-spacing:-4px;color:#b1bfd3}.lesson-index>small{font-size:10px;margin-top:8px;color:#7f8ea6}.reading-strip{background:#eaf0f8;border:1px solid #e1e8f3;border-radius:10px;padding:15px 19px;display:flex;align-items:center;gap:13px}.book-mark{font-size:26px;color:#5e779d}.reading-strip strong{font-size:12px}.reading-strip p{font-size:11px;color:var(--muted)}.reading-strip .text-button{margin-left:auto;white-space:nowrap}.text-button{font-size:12px;color:var(--blue);font-weight:650;padding:7px 4px;line-height:1.6}.text-button:hover{text-decoration:underline}.text-button.small{font-size:11px}.lesson-reading{background:var(--paper);padding:24px 27px;border:1px solid var(--line);border-top:0;border-radius:0 0 12px 12px}.lesson-reading p{font-size:14px;margin-bottom:12px;max-width:850px}.lesson-reading p:last-child{margin-bottom:0}.workflow-guide{display:flex;align-items:center;gap:14px;margin:28px 0 21px;color:#697994;font-size:12px}.workflow-guide span{display:flex;align-items:center;gap:8px;white-space:nowrap}.workflow-guide b{width:20px;height:20px;background:#e5ebf5;border-radius:50%;text-align:center;line-height:20px;font-size:10px;font-weight:650}.workflow-guide i{height:1px;flex:1;background:var(--line);max-width:70px}.workspace{display:grid;grid-template-columns:minmax(275px,.85fr) minmax(380px,1.15fr);gap:20px;align-items:start}.goal-panel,.run-panel{border:1px solid var(--line);background:var(--paper);border-radius:var(--radius);padding:24px}.run-panel{border-top:3px solid var(--blue);padding-top:22px}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:14px}.section-step{font-size:11px;color:var(--muted);display:block;margin-bottom:4px;font-weight:650}.section-description{font-size:12px;color:var(--muted);margin-top:8px;margin-bottom:20px}.goal-fields{display:grid;grid-template-columns:1fr 1fr;gap:17px 14px}.goal-field{min-width:0}.goal-field label{display:flex;gap:7px;align-items:center;font-size:12px}.field-number{font-size:10px;color:#9aa7ba;font-weight:400}.goal-field textarea{font-size:12px;min-height:110px;line-height:1.75;padding:11px 12px;background:#fcfdff;overflow-y:auto}.goal-field .field-hint{font-size:10px;color:#7b889c;margin-top:5px;line-height:1.6}.save-status{font-size:10px;color:var(--teal);line-height:1.7;margin-top:18px}.privacy-note{font-size:10px;color:#8390a3;margin-top:3px}.source-badge{font-size:10px;line-height:1.6;padding:5px 8px;border:1px solid var(--line);border-radius:5px;white-space:nowrap;color:var(--muted);background:var(--surface)}.scenario-field{margin-top:21px}.scenario-field select{font-size:12px;background:#f8faff}.runtime-fields{display:grid;grid-template-columns:1fr 130px;gap:12px;margin-top:16px}.runtime-fields label{font-size:11px}.runtime-fields input{width:100%;font-size:12px}.unit-input{display:flex;align-items:center;border:1px solid #cbd5e4;border-radius:8px;overflow:hidden}.unit-input input{border:0;border-radius:0;min-width:0;padding-right:3px}.unit-input>span{font-size:10px;color:var(--muted);padding-right:9px;white-space:nowrap}.execution-note{font-size:10px;color:#7b889e;margin:12px 0 18px;line-height:1.65}.node-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:13px 10px;background:#f3f6fc;border-radius:10px;padding:19px 14px}.node-button{position:relative;text-align:left;border:1px solid #d6dfed;border-radius:6px;background:white;padding:9px 7px;line-height:1.5;min-height:57px}.node-button:not(:nth-child(4n)):after{content:'›';position:absolute;right:-9px;top:21px;font-size:13px;color:#8fa0ba}.node-button small{display:block;color:#8b99ae;font-size:9px;margin-bottom:4px}.node-button strong{font-size:10px;font-weight:600;display:block;word-break:keep-all}.node-button.active{border-color:var(--blue);box-shadow:0 0 0 1px var(--blue);color:var(--blue);background:#f5f7ff}.node-button.executed small{color:var(--teal)}.node-button.blocked{border-color:var(--rose);box-shadow:0 0 0 1px var(--rose);color:var(--rose);background:#fff7f9}.node-button.active:before,.node-button.blocked:before{content:'';position:absolute;left:8px;top:-5px;border-top:5px solid currentColor;border-right:4px solid transparent;border-left:4px solid transparent}.flow-footnote{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:6px 0 14px}.flow-legend{font-size:9px;color:#8794a9;display:flex;gap:5px;align-items:center}.flow-legend i{width:7px;height:7px;background:var(--blue);border-radius:2px}.node-detail{font-size:11px;background:var(--surface);padding:16px;border-radius:8px;margin:10px 0 20px}.node-detail label{font-size:11px;margin-top:13px}.node-detail textarea{font-size:11px;min-height:58px}.node-detail p{font-size:11px;margin:8px 0}.branch-rule{display:flex;align-items:center;gap:8px;font-size:11px;margin-top:10px}.branch-rule select{font-size:11px;flex:1}.run-controls{display:flex;gap:8px;align-items:center}.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;font-size:12px;padding:11px 15px;border-radius:7px;min-height:40px;font-weight:650;text-decoration:none;line-height:1.5;text-align:center;border:1px solid transparent;white-space:nowrap}.button.primary{background:var(--blue);color:white}.button.primary:hover:not(:disabled){background:#294aca}.button.secondary{background:white;border-color:#cdd7e8}.button.secondary:hover:not(:disabled){background:var(--blue-wash);border-color:#aabade}.button.quiet{background:var(--surface);border-color:var(--line);color:var(--muted)}.button.quiet:hover:not(:disabled){background:#e7edf7}.run-controls .primary{flex:1}.run-controls .button{padding:10px 12px}.run-controls .quiet{padding:10px}.run-status{display:flex;align-items:center;gap:7px;font-size:11px;margin:20px 0 11px;flex-wrap:wrap}.status-dot{width:7px;height:7px;border-radius:50%;background:#9eabc0}.run-status strong{font-size:12px}.run-status>span:last-child{color:var(--muted);margin-left:auto;font-size:10px}.run-status.is-active .status-dot{background:var(--blue)}.run-status.is-blocked .status-dot{background:var(--rose)}.run-status.is-done 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span{font-size:9px;color:#7b899f;display:block;margin-bottom:7px;white-space:nowrap}.metric-strip strong{font-size:23px;font-weight:600;letter-spacing:-.8px}.metric-strip small{font-size:9px;font-weight:400;color:#7c89a1;margin-left:3px;letter-spacing:0}.metric-strip>div:last-child strong{color:var(--teal)}.simulation-notice{font-size:9px;line-height:1.7;color:#8a95a7;margin-top:15px}.evidence-panel{margin-top:25px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.evidence-tabs{display:flex;gap:23px;border-bottom:1px solid var(--line);margin-top:17px}.evidence-tabs button{font-size:12px;padding:11px 0 13px;border-radius:0;position:relative;color:var(--muted)}.evidence-tabs button[aria-selected=true]{color:var(--ink);font-weight:700}.evidence-tabs button[aria-selected=true]:after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--ink)}.evidence-tabs button>span{display:inline-flex;align-items:center;justify-content:center;min-width:19px;height:17px;font-size:9px;background:#eaf0f9;border-radius:8px;margin-left:5px;color:#657b9f}.evidence-content{min-height:128px;max-height:380px;overflow:auto;padding-top:19px}.empty-evidence{display:flex;align-items:center;gap:18px;padding:14px 8px;color:#8493ab}.empty-evidence>span{font-size:31px;color:#bec9da}.empty-evidence strong{font-size:13px;color:#657b9a}.empty-evidence p{font-size:12px;margin-top:5px}.trace-list{list-style:none;padding:0;margin:0}.trace-event{display:grid;grid-template-columns:28px 65px 1fr;gap:10px;padding:8px 0;align-items:start;font-size:11px;position:relative}.trace-event:before{content:'';position:absolute;top:0;bottom:0;left:12px;width:1px;background:var(--line)}.trace-event .event-index{border:1px solid var(--line);background:white;border-radius:50%;z-index:1;width:24px;height:24px;text-align:center;line-height:22px;font-size:9px;color:#7e8da5}.trace-event .event-node{color:var(--blue);font-size:10px;padding-top:3px}.trace-event p{line-height:1.65;font-size:11px}.trace-event small{font-size:9px;color:#91a0b5}.trace-caption{font-size:10px;color:#8695ab;margin-bottom:14px}.state-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.state-item{background:var(--surface);padding:11px;border-radius:6px;min-width:0}.state-item dt{font-size:10px;color:var(--muted);overflow-wrap:anywhere}.state-item dd{margin:6px 0 0;font-size:12px;font-weight:650;overflow-wrap:anywhere}.json-details{font-size:12px;margin-top:10px;border:0;padding-bottom:0}.output-banner{display:flex;align-items:center;justify-content:space-between;gap:15px;background:var(--teal-wash);padding:14px;border-radius:8px;margin-bottom:12px}.output-banner strong{font-size:13px;color:var(--teal)}.output-banner p{font-size:11px}.shot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.shot{border:1px solid var(--line);border-radius:8px;padding:13px}.shot h3{font-size:12px;color:var(--blue)}.shot p{font-size:11px;margin-top:8px}.shot .shot-time{font-size:10px;color:var(--muted)}.check-list{list-style:none;padding:0;margin:0}.check-row{display:flex;gap:9px;font-size:11px;align-items:flex-start;padding:8px 0;border-bottom:1px solid #edf1f7}.check-symbol{font-size:12px;font-weight:700;flex-shrink:0;color:var(--rose)}.check-row.passed .check-symbol{color:var(--teal)}.check-row .check-actual{font-size:10px;color:var(--muted);overflow-wrap:anywhere}.run-history{border-top:1px solid var(--line);margin-top:15px;padding-top:14px;font-size:11px;color:var(--muted)}.reflection-panel{display:grid;grid-template-columns:1fr 1.5fr;gap:36px;margin-top:28px;padding:28px 5px 12px}.reflection-intro h2{font-size:23px;line-height:1.55;letter-spacing:-1px}.reflection-intro>p{font-size:12px;margin-top:15px;color:var(--muted)}#expected-evidence ul{font-size:11px;color:var(--muted);padding-left:16px;margin-top:15px}.reflection-work label{font-size:12px}.reflection-work textarea{font-size:12px;line-height:1.8}.reflection-actions{display:flex;align-items:center;gap:15px;margin-top:12px}.reflection-actions>span{font-size:11px;color:var(--teal);line-height:1.6}.mistakes{font-size:12px;margin-top:6px}.mistakes ul{font-size:11px;color:var(--muted)}.exercise-fields{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}.exercise-fields input,.exercise-fields select,.exercise-fields textarea{width:100%;font-size:12px}.exercise-fields textarea{min-height:70px}.exercise-note{font-size:11px;color:var(--muted);margin-bottom:12px}.section-title{margin:8px 0 28px}.section-title h1{font-size:36px;line-height:1.45}.notice{border:1px solid #cad8ef;background:#edf3fc;border-radius:10px;padding:18px 20px;font-size:13px}.notice p{font-size:12px;margin-top:7px;color:var(--muted)}.notice.danger{background:var(--rose-wash);border-color:#e6bbcc;margin-bottom:20px;color:var(--rose)}.test-toolbar{display:flex;align-items:center;gap:20px;margin:25px 0 18px}.test-toolbar span{font-size:12px;color:var(--muted)}.test-list{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:white}.test-row{display:flex;align-items:center;gap:16px;padding:17px 20px;border-bottom:1px solid var(--line)}.test-row:last-child{border-bottom:0}.test-id{font-size:11px;color:#8b99ae;width:28px}.test-row h3{font-size:13px}.test-row p{font-size:11px;color:var(--muted);margin-top:3px}.test-row>div{flex:1;min-width:0}.test-state{font-size:10px;padding:4px 8px;border-radius:5px;background:var(--surface);color:var(--muted);white-space:nowrap}.test-state.pass{background:var(--teal-wash);color:var(--teal)}.test-state.fail{background:var(--rose-wash);color:var(--rose)}.test-row .button{padding:8px 12px;min-height:34px;font-size:11px}.test-detail{margin-top:22px;background:white;border:1px solid var(--line);border-radius:12px;padding:24px}.test-detail>p{font-size:12px;margin:10px 0}.book-reference{display:flex;align-items:center;gap:34px;padding:24px;background:white;border:1px solid var(--line);border-radius:12px}.book-cover{width:150px;height:205px;flex-shrink:0;background:var(--ink);color:white;border-radius:2px 8px 8px 2px;padding:20px 18px 17px 24px;box-shadow:inset 5px 0 0 #354b70;display:flex;flex-direction:column;justify-content:space-between}.book-cover small{font-size:11px;color:#b7c9ea}.book-cover strong{font-size:21px;line-height:1.5;letter-spacing:-1px}.book-cover>span{font-size:9px;color:#b6c6e3;line-height:1.7}.book-reference h2{font-size:22px}.book-reference p{font-size:13px;margin-top:12px}.muted{color:var(--muted)}.notes-section{margin-top:34px}.notes-section>h2{margin-bottom:12px}.route-row{display:grid;grid-template-columns:140px 100px 1fr;gap:12px;padding:16px 0;border-bottom:1px solid var(--line);font-size:12px}.route-row>span{color:var(--muted);font-size:11px}.notes-section details{font-size:13px}.notes-section details ul{font-size:12px;color:var(--muted)}.notes-section>p{font-size:12px}.rubric-lines p{font-size:12px;margin:6px 0;color:var(--muted)}.rubric-lines strong{color:var(--ink);margin-right:6px}.engine-panel{display:grid;grid-template-columns:1fr 240px;gap:35px;padding:26px;background:white;border:1px solid var(--line);border-radius:12px;margin-top:36px}.engine-panel p{font-size:12px;margin-top:12px;color:var(--muted)}.engine-actions{display:flex;flex-direction:column;align-items:stretch;gap:11px;justify-content:center}.engine-actions>.source-badge{align-self:flex-start}.disabled{opacity:.45;pointer-events:none}.engine-actions .text-button{align-self:flex-start}.backup-panel{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:30px;flex-wrap:wrap}.backup-panel h2{font-size:16px}.backup-panel p{font-size:11px;color:var(--muted);margin-top:6px}.backup-panel>div:last-of-type{display:flex;gap:8px}.backup-panel label{margin:0;cursor:pointer}.backup-panel>p{width:100%}.page-footer{display:flex;justify-content:space-between;gap:15px;border-top:1px solid var(--line);padding-top:20px;margin-top:30px;font-size:10px;color:#8b98ad}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);z-index:90;padding:13px 20px;border-radius:9px;background:var(--ink);color:white;font-size:12px;max-width:calc(100% - 32px);line-height:1.7;box-shadow:0 4px 18px #1c2c4c22}.note-link{display:block;font-size:11px;color:var(--blue);line-height:1.7;margin:8px 0;overflow-wrap:anywhere}
@media(min-width:1500px){main{padding:44px 58px 25px}.topbar{padding:0 58px}.goal-field textarea{min-height:113px}.workspace{gap:25px}.node-button strong{font-size:11px}.node-button{padding:11px}.node-flow{gap:15px 12px}.goal-panel,.run-panel{padding:27px}.run-panel{padding-top:25px}}
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@media(max-width:360px){.workflow-guide{flex-direction:column;align-items:flex-start;gap:9px}.workflow-guide i{display:none}.workflow-guide span{max-width:100%;white-space:normal}}
@media(prefers-reduced-motion:no-preference){.button,.node-button,.lesson-link{transition:background .12s,border-color .12s}.toast{animation:toast-in .16s ease-out}@keyframes toast-in{from{opacity:0;bottom:19px}to{opacity:1;bottom:25px}}}