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.filters{display:flex;gap:12px;margin-top:28px}.search{display:flex;align-items:center;gap:9px;background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:9px 12px;flex:1}.search input{border:0;outline:none;background:none;min-width:0;flex:1;font-size:12px}.search svg{color:var(--faint)}.filters select{font-size:12px;background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:9px 12px;max-width:100%}.catalog-hint{font-size:11px;margin:15px 0 22px;color:var(--muted)}.catalog-list{border-top:1px solid var(--line)}.catalog-row{display:flex;align-items:center;gap:18px;border-bottom:1px solid var(--line);padding:16px 8px;transition:background .15s}.catalog-row:hover{background:var(--soft)}.catalog-index{color:var(--faint);font-size:12px;width:30px;flex-shrink:0;font-family:Consolas,monospace;text-align:center}.catalog-index.done{color:var(--green)}.catalog-row>div{flex:1;min-width:0}.catalog-row h3{font-size:14px}.catalog-row p{font-size:10px;margin-top:4px;color:var(--muted)}.catalog-row>svg{width:16px;color:var(--faint)}.badge{display:inline-block;border:1px solid var(--badge-line);color:var(--badge-text);font-size:9px;line-height:1.6;padding:2px 7px;border-radius:4px;white-space:nowrap}.badge.green{background:var(--soft);border-color:var(--soft-line);color:var(--accent-text)}.badge.muted{background:var(--info-bg);border-color:var(--info-line);color:var(--info-text)}.empty{padding:30px 0;color:var(--muted);font-size:13px}.empty h1{margin-bottom:15px}.empty p{margin:10px 0}
.lesson-heading{margin-bottom:23px}.back-link{display:inline-flex;align-items:center;gap:5px;font-size:10px;color:var(--accent-muted);margin-bottom:20px}.back-link svg{width:13px}.lesson-title{display:flex;align-items:center;gap:20px;justify-content:space-between}.lesson-title h1{font-size:27px}.lesson-title .eyebrow{margin-bottom:8px}.workbench{display:grid;grid-template-columns:minmax(0,.93fr) minmax(0,1.07fr);gap:28px;align-items:start}.lesson-reading{min-width:0}.reading-tabs{display:flex;gap:23px;border-bottom:1px solid var(--line);margin-bottom:24px}.reading-tabs button{font-size:12px;font-weight:600;padding:0 0 12px;color:var(--faint);border-bottom:2px solid transparent}.reading-tabs button[aria-selected=true]{color:var(--forest);border-color:var(--forest)}.section-kicker{display:block;font-size:9px;letter-spacing:1.4px;color:var(--accent-muted);font-weight:650;margin:0 0 14px}.lesson-reading p{font-size:13px;line-height:1.9;margin:0 0 16px;color:var(--text)}.lesson-reading h3{font-size:13px;margin:21px 0 7px}.lesson-reading h2{margin-bottom:15px}.example-code{background:var(--soft);color:var(--accent-text);border:1px solid var(--line);border-radius:5px;padding:17px;font-size:12px;line-height:1.8;margin:19px 0;tab-size:4}.pitfall{display:flex;gap:10px;padding:13px 15px;border-left:3px solid var(--warn-strong);background:var(--warn-bg);margin:22px 0;border-radius:0 4px 4px 0;font-size:12px;color:var(--warn-text)}.pitfall>svg{flex-shrink:0;margin-top:2px;color:var(--warn-icon);width:17px}.pitfall p{color:var(--warn-text);font-size:11px;line-height:1.8;margin:4px 0 0}.pitfall b{font-size:11px}.quiz{border-top:1px solid var(--line);padding-top:22px;margin:27px 0 22px}.quiz h3{margin:7px 0 15px}.quiz-option{display:flex;align-items:center;gap:10px;background:var(--paper);border:1px solid var(--line);border-radius:4px;width:100%;padding:8px 10px;text-align:left;font-size:12px;margin-bottom:7px}.quiz-option>span{font-size:10px;border:1px solid var(--line);border-radius:3px;padding:0 5px;color:var(--faint)}.quiz-option:hover{border-color:var(--accent-line)}.quiz-option.correct{background:var(--success-bg);border-color:var(--success-line)}.quiz-option.incorrect{background:var(--error-bg);border-color:var(--error-line)}.quiz #quizFeedback{font-size:11px;line-height:1.8;margin-top:10px}.positive{color:var(--success-text)!important}.negative{color:var(--red)!important}.sample-grid{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);border-radius:5px;margin:21px 0 7px;overflow:hidden}.sample-grid>div{min-width:0}.sample-grid>div+div{border-left:1px solid var(--line)}.sample-grid span{display:block;font-size:9px;letter-spacing:.8px;color:var(--muted);background:var(--soft);padding:8px 13px;border-bottom:1px solid var(--line)}.sample-grid pre{font-size:12px;padding:14px;min-height:72px;background:var(--paper)}.text-button{display:inline-flex;align-items:center;gap:6px;padding:6px 0;font-size:10px;color:var(--green)}.text-button svg{width:12px}.sample-note{font-size:10px!important;line-height:1.7!important;color:var(--faint)!important;margin-top:9px!important}.help-block{padding-top:18px;border-top:1px solid var(--line);margin-top:24px}.help-block .button{font-size:11px}.help-block .button span{font-size:10px;margin-left:10px;color:var(--faint)}.hint{font-size:12px!important;padding:10px 12px;background:var(--soft);border-radius:3px;margin:10px 0!important}.help-block details{margin-top:17px;border-top:1px solid var(--line);padding:16px 0}.help-block summary{font-size:12px;font-weight:600;color:var(--accent-text);cursor:pointer}.help-block ol{font-size:12px;color:var(--text);padding-left:20px;line-height:1.85}.small{font-size:11px!important;color:var(--muted)!important;line-height:1.8!important;margin-top:10px!important}.help-steps{padding-left:18px;font-size:13px;line-height:2.1;color:var(--text)}
.coding-panel{min-width:0;position:sticky;top:16px}.editor-top{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--code-chrome);border:1px solid var(--code-chrome);border-bottom:1px solid var(--code-line);color:var(--on-code);padding:7px 12px;border-radius:7px 7px 0 0;font-size:11px}.editor-top>span{display:flex;align-items:center;gap:7px}.editor-top>div{display:flex;align-items:center;gap:2px}.editor-top #savedLabel{font-size:8px;color:var(--on-code-2);margin-right:7px}.editor-top .icon-button{color:var(--on-code-2);width:26px;height:26px}.editor-top .icon-button svg{width:14px;height:14px}.editor-top .icon-button:hover{background:var(--code-hover)}.editor-top>span>svg{width:14px}.cm-editor{max-height:530px;overflow:auto}.cm-editor.cm-focused{outline:1px solid var(--focus)}.runbar{padding:13px 12px;background:var(--paper);display:flex;align-items:center;gap:8px;border:1px solid var(--line-strong);border-top:none}.runbar .button{font-size:11px;min-height:35px;padding:7px 11px}.keyboard-hint{font-size:8px;color:var(--faint);margin-left:auto;white-space:nowrap}.io-panel{border:1px solid var(--line-strong);border-top:0;background:var(--paper);border-radius:0 0 6px 6px;overflow:hidden}.io-header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:var(--tint-1);font-size:10px;border-bottom:1px solid var(--line-soft);border-top:1px solid var(--line-soft)}.io-header:first-child{border-top:0}.io-header>span:last-child{font-size:9px;color:var(--faint)}.io-header code{color:var(--faint);font-size:9px;margin-left:5px}#stdin{display:block;width:100%;resize:vertical;min-height:78px;max-height:300px;border:0;background:var(--paper);padding:12px 15px;font-family:Consolas,monospace;font-size:12px;line-height:1.65;border-radius:0}.output{min-height:80px;padding:13px 15px;font-size:12px;color:var(--accent-text);max-height:260px;overflow:auto}.muted-output{color:var(--faint);font-family:inherit;font-size:11px}.feedback{font-size:11px;line-height:1.8;padding:12px 14px;border-top:1px solid var(--line);background:var(--tint-1)}.feedback:empty{display:none}.feedback b{display:block;font-size:12px}.feedback b svg{width:14px;margin-right:4px}.feedback p{margin-top:5px;color:inherit;font-size:11px;line-height:1.8}.feedback.success{background:var(--success-bg);color:var(--success-text)}.feedback.error{background:var(--error-bg);color:var(--error-text)}.feedback pre{max-height:220px;overflow:auto;font-size:10px;padding-top:10px}.test-row{border-top:1px solid var(--line-soft);font-size:10px}.test-row summary{padding:9px 14px;cursor:pointer;display:flex;justify-content:space-between;gap:12px;list-style:none}.test-row summary:after{content:'+';color:var(--faint)}.test-row[open] summary:after{content:'−'}.test-row summary span{flex:1}.test-row summary small{font-size:9px}.test-row.passed summary{color:var(--success)}.test-row.failed summary{color:var(--error)}.test-detail{padding:0 14px 10px;display:grid;grid-template-columns:1fr 1fr;gap:8px}.test-detail>div:first-child{grid-column:1/-1}.test-detail b{font-size:9px;color:var(--muted);font-weight:500}.test-detail pre{background:var(--tint-1);padding:8px;font-size:10px;max-height:140px;overflow:auto}.editor-bottom{font-size:8px;display:flex;align-items:center;gap:5px;color:var(--faint);padding:10px 0}.editor-bottom svg{width:12px}.lesson-actions{display:flex;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding-top:14px;margin-top:5px;font-size:10px}.lesson-actions>span{color:var(--faint)}.text-link{color:var(--green);font-weight:500}.text-link:hover{text-decoration:underline}.notes-label{display:block;font-size:10px;color:var(--accent-muted);margin:19px 0 7px}.notes{font-size:11px;line-height:1.8;background:var(--soft);resize:vertical;border:1px solid var(--line);border-radius:4px;min-height:68px;padding:10px;width:100%}.concept-lab{padding:17px 15px;border:1px solid var(--soft-line);border-radius:5px;margin-top:18px;background:var(--tint-1)}.lab-head{display:flex;justify-content:space-between;font-size:11px}.lab-head>span{color:var(--faint);font-size:10px}.lab-array{display:flex;gap:5px;margin:18px 0}.lab-array>span,.lab-grid>span{display:grid;place-items:center;height:34px;flex:1;border:1px solid var(--soft-line);font-size:11px;background:var(--tint-3);color:var(--faint);border-radius:3px;font-family:Consolas,monospace}.lab-array>span.inside{background:var(--paper);color:var(--accent-text)}.lab-array>span.active,.lab-grid>span.active{background:var(--forest);color:var(--on-forest-hi);border-color:var(--forest)}.lab-grid{display:grid;grid-template-columns:repeat(3,1fr);max-width:180px;gap:5px;margin:14px auto}.concept-lab p{font-size:11px;min-height:38px;margin-bottom:13px}.lab-controls{display:flex;justify-content:space-between;gap:8px}
.exam-intro{display:grid;grid-template-columns:1.4fr 1fr;gap:45px;padding:26px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:28px}.exam-intro h2{font-size:20px}.exam-intro p{font-size:12px;line-height:1.9;margin:12px 0}.exam-intro ul{padding-left:17px;font-size:12px;color:var(--muted);line-height:1.9}.exam-strategy{background:var(--soft);padding:21px 24px;border-radius:6px;align-self:start}.exam-strategy>div{font-size:11px;display:flex;gap:17px;padding:10px 0;border-top:1px solid var(--soft-line)}.exam-strategy b{font-family:Consolas,monospace;font-size:11px;color:var(--accent-text);font-weight:500;min-width:51px}.exam-options{display:grid;grid-template-columns:1fr 1fr;gap:22px}.exam-options article{background:var(--paper);border:1px solid var(--line);border-radius:7px;padding:25px}.exam-options h2{font-size:20px}.exam-options p{font-size:12px;line-height:1.9;margin:13px 0 20px}.exam-meta{font-size:11px;color:var(--accent-muted);display:flex;gap:20px;margin:15px 0 20px}.exam-bar{display:flex;align-items:center;justify-content:space-between;background:var(--chrome);color:var(--on-chrome);padding:12px 18px;border-radius:6px;font-size:11px;gap:15px;margin-bottom:24px}.exam-bar>div{display:flex;align-items:center;gap:13px}.exam-bar>b{font-weight:500}.exam-bar #examTime{font-family:Consolas,monospace;color:var(--lime);font-size:19px;min-width:80px}.exam-bar>a{font-size:10px;color:var(--on-chrome-2)}.exam-task-list{margin:20px 0}.exam-task-list>a{display:flex;align-items:center;gap:15px;padding:16px 3px;border-bottom:1px solid var(--line)}.exam-task-list>a>span{color:var(--green)}.exam-task-list>a>div{flex:1}.exam-task-list small{display:block;color:var(--muted);font-size:10px}.exam-task-list b{font-size:14px}.exam-task-list>a>svg{color:var(--accent-muted)}.exam-history{margin-top:36px}.exam-history h2{font-size:19px;margin-bottom:20px}.history-row{padding:16px 0;display:grid;grid-template-columns:1fr .4fr .7fr 1fr;gap:15px;align-items:start;border-top:1px solid var(--line);font-size:11px}.history-row strong{font-size:23px;color:var(--green)}.history-row small{display:block;font-size:10px;color:var(--faint);margin-top:3px}.history-row>span{color:var(--muted)}
.guide-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:48px}.guide-grid h2{font-size:19px;margin:24px 0 17px}.guide-grid h2:first-child{margin-top:8px}.pattern-table{border-top:1px solid var(--line)}.pattern-table>a{display:block;border-bottom:1px solid var(--line);padding:12px 0;font-size:12px}.pattern-table>a:hover{background:var(--soft)}.pattern-table span{display:block;color:var(--muted);font-size:11px}.pattern-table b{display:block;font-weight:600;font-size:12px;margin-top:3px;color:var(--accent-text)}.complexity-table{border:1px solid var(--line);border-radius:4px;overflow:hidden}.complexity-table>div{display:flex;gap:20px;padding:10px 13px;font-size:11px;border-bottom:1px solid var(--line);background:var(--paper)}.complexity-table>div:last-child{border:0}.complexity-table b{min-width:100px;font-family:Consolas,monospace;font-weight:500}.complexity-table span{color:var(--muted)}.glossary{font-size:12px;display:grid;grid-template-columns:110px 1fr;gap:12px 14px;line-height:1.85}.glossary dt{font-weight:600;color:var(--accent-text)}.glossary dd{margin:0;color:var(--muted)}.checklist{display:grid;gap:12px}.checklist label{display:flex;gap:10px;font-size:12px;color:var(--text);align-items:flex-start}.checklist input{accent-color:var(--forest);margin:4px 0 0;width:15px;height:15px}.guide-grid p{font-size:12px;line-height:2}.about-content{max-width:800px}.about-content h2{font-size:20px;margin:30px 0 13px}.about-content p,.about-content ul{font-size:13px;line-height:1.9;margin:12px 0;color:var(--text)}.about-content a{color:var(--green);text-decoration:underline;text-underline-offset:3px}.verified-note{display:flex;gap:14px;background:var(--soft);padding:21px;border-radius:6px;border:1px solid var(--soft-line)}.verified-note>svg{flex-shrink:0;color:var(--accent)}.verified-note p{margin:6px 0 0;font-size:12px}.verified-note b{font-size:13px}.toast{position:fixed;bottom:22px;left:calc(50% + 90px);transform:translateX(-50%);background:var(--chrome);color:var(--on-chrome);padding:13px 20px;border-radius:6px;max-width:560px;width:max-content;z-index:80;font-size:12px;box-shadow:0 8px 25px var(--shadow)}
@media(min-width:1500px){main{padding:38px 48px}.workbench{gap:38px}.hero-copy{padding:35px 38px}.hero-diagram{padding:28px 40px}}
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.ladder{border:1px solid var(--soft-line);border-radius:6px;background:var(--tint-1);padding:12px 14px;margin:0 0 20px}.ladder-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;font-size:11px;color:var(--accent-muted);margin-bottom:9px}.ladder-head b{color:var(--forest);font-size:12px}.ladder ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.ladder a{display:flex;gap:8px;align-items:flex-start;height:100%;padding:8px;border:1px solid transparent;border-radius:5px;min-width:0}.ladder a:hover{background:var(--soft)}.ladder a.current{background:var(--paper);border-color:var(--accent-line)}.ladder a>span:last-child{min-width:0}.ladder b{display:block;font-size:11px;line-height:1.4}.ladder small{display:block;font-size:10px;line-height:1.4;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ladder-num{flex-shrink:0;display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--tint-3);color:var(--accent-text);font-size:10px;font-weight:600}.ladder a.solved .ladder-num{background:var(--green);color:var(--on-forest)}.ladder-num svg{width:12px;height:12px}.lesson-reading .ladder-note{font-size:11px;line-height:1.7;margin:9px 0 0;color:var(--accent-muted)}.badge.step{background:var(--step-bg);border-color:var(--step-line);color:var(--step-text)}.test-hint{display:flex;gap:6px;align-items:flex-start;margin:0 14px 10px;padding:8px 10px;border-radius:3px;background:var(--warn-bg);color:var(--warn-text);font-size:11px;line-height:1.6}.test-hint svg{flex-shrink:0;width:13px;margin-top:2px}.feedback p svg{width:13px;vertical-align:-2px}.line-reveal .button{margin-top:4px}.line-reveal ol:empty{display:none}
@media(max-width:760px){.ladder{padding:10px}.ladder ol{grid-template-columns:repeat(2,minmax(0,1fr))}}
.topbar-right{display:flex;align-items:center;gap:14px;min-width:0}.theme-picker{position:relative}.theme-button{display:inline-flex;align-items:center;gap:7px;min-height:32px;padding:5px 11px;border:1px solid var(--line);border-radius:16px;background:var(--paper);color:var(--text);font-size:11px}.theme-button:hover{background:var(--soft)}.theme-button svg{width:15px;height:15px}.theme-menu{position:absolute;right:0;top:calc(100% + 8px);z-index:40;width:240px;padding:6px;border:1px solid var(--line);border-radius:8px;background:var(--paper);box-shadow:0 12px 32px var(--shadow)}.theme-menu button{display:flex;align-items:center;gap:10px;width:100%;padding:8px;border-radius:6px;text-align:left;color:var(--ink)}.theme-menu button:hover{background:var(--soft)}.theme-menu button[aria-checked=true]{background:var(--soft);box-shadow:inset 0 0 0 1px var(--accent-line)}.theme-menu b{display:block;font-size:12px;font-weight:600}.theme-menu small{display:block;font-size:10px;color:var(--muted)}.theme-swatch{flex-shrink:0;width:26px;height:26px;border-radius:50%;box-shadow:inset 0 0 0 1px #00000014}.theme-swatch.mint{background:linear-gradient(135deg,#153d36 0 46%,#d3ee98 46% 66%,#f5f7f6 66%)}.theme-swatch.sky{background:linear-gradient(135deg,#24364e 0 46%,#ffdab4 46% 66%,#f0f8ff 66%)}.theme-swatch.lavender{background:linear-gradient(135deg,#37304c 0 46%,#fed4e6 46% 66%,#f8f5ff 66%)}.theme-swatch.peach{background:linear-gradient(135deg,#472b39 0 46%,#fed8c4 46% 66%,#fef4ef 66%)}.theme-swatch.dusk{background:linear-gradient(135deg,#1e2231 0 46%,#f7cc96 46% 66%,#2b2e3d 66%)}
@media(max-width:760px){.topbar-right{gap:10px}.theme-button{padding:5px 8px}.theme-button span{display:none}}
.deep{border-top:1px solid var(--line);margin-top:26px;padding-top:24px}
.deep-head{display:flex;justify-content:space-between;align-items:center;gap:8px 12px;flex-wrap:wrap}
.deep-head .section-kicker{margin:0}
.deep-progress{font-size:10px;color:var(--accent-text);background:var(--soft);border:1px solid var(--soft-line);border-radius:999px;padding:3px 10px}
.lesson-reading .deep-lead{font-size:12px;color:var(--muted);margin:10px 0 4px}
.lesson-reading .deep-title{font-size:15px;margin:30px 0 9px;color:var(--ink)}
.deep p code,.remember li code,.trace code,.mistake-why code,.mistake-input code,.drill-note code,.drill-reveal code{background:var(--soft);color:var(--accent-text);padding:1px 5px;border-radius:3px;font-size:.92em;overflow-wrap:anywhere}
.run-example{margin:16px 0 20px}
.lesson-reading .run-example .example-code{margin:0}
.run-example .example-code:not(:last-child){border-radius:5px 5px 0 0}
.run-io{display:grid;grid-template-columns:64px minmax(0,1fr);border:1px solid var(--line);border-top:0;background:var(--paper)}
.run-io:last-child{border-radius:0 0 5px 5px}
.run-io span{font-size:9px;letter-spacing:.8px;text-transform:uppercase;color:var(--muted);padding:10px 12px;border-right:1px solid var(--line-soft);background:var(--tint-1)}
.run-io pre{padding:9px 14px;font-size:12px;line-height:1.7;color:var(--text)}
.trace-wrap{overflow-x:auto;margin:14px 0 6px;border:1px solid var(--line);border-radius:5px;max-width:100%}
.trace{border-collapse:collapse;width:100%;font-size:12px;background:var(--paper)}
.trace th{font-size:10px;font-weight:600;text-align:left;color:var(--muted);background:var(--soft);padding:8px 11px;border-bottom:1px solid var(--line);white-space:nowrap}
.trace td{padding:7px 11px;border-top:1px solid var(--line-soft);color:var(--text);font-family:Consolas,"Courier New",monospace;white-space:nowrap}
.trace tr:first-child td{border-top:0}
.trace td code{background:none;padding:0}
.lesson-reading .trace-note{font-size:12px;color:var(--muted);margin:6px 0 18px}
.drill{border:1px solid var(--soft-line);border-left:3px solid var(--accent-deco);border-radius:6px;background:var(--tint-1);padding:15px 16px 14px;margin:24px 0}
.drill.done{border-left-color:var(--success)}
.drill-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}
.drill-kind{display:inline-flex;align-items:center;gap:7px;font-size:10px;letter-spacing:.9px;text-transform:uppercase;font-weight:650;color:var(--accent-text)}
.drill-kind svg,.drill-done svg{width:15px;height:15px;flex-shrink:0}
.drill-done{display:none;align-items:center;gap:5px;font-size:10px;font-weight:600;color:var(--success-text);background:var(--success-bg);border:1px solid var(--success-line);border-radius:999px;padding:2px 9px}
.drill.done .drill-done{display:inline-flex}
.lesson-reading .drill-goal{font-size:13px;margin:4px 0 10px;color:var(--ink);font-weight:500}
.lesson-reading .drill .example-code{margin:10px 0;background:var(--paper)}
.lesson-reading .drill-note{font-size:12px;margin:0 0 10px}
.drill-label{display:block;font-size:11px;color:var(--muted);margin:10px 0 6px}
.drill-answer{display:block;width:100%;resize:vertical;min-height:44px;border:1px solid var(--line-strong);border-radius:5px;background:var(--paper);padding:9px 12px;font-family:Consolas,"Courier New",monospace;font-size:13px;line-height:1.6}
.blank{font:inherit;color:var(--ink);background:var(--paper);border:1px dashed var(--accent-line);border-radius:4px;padding:1px 6px;margin:0 2px;max-width:100%}
.blank:focus{border-style:solid}
.lesson-reading .drill-sample{margin:10px 0}
.drill-sample pre{min-height:0}
.drill-editor{border:1px solid var(--line);border-radius:5px;overflow:hidden;margin:10px 0}
.drill-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.drill-actions .button,.drill-reveal .button{min-height:32px;font-size:11px;padding:6px 12px;margin-top:0}
.drill-feedback{font-size:12px;line-height:1.7;margin-top:12px;padding:10px 12px;border-radius:5px;background:var(--paper);border:1px solid var(--line);color:var(--text)}
.drill-feedback:empty{display:none}
.drill-feedback b{display:flex;align-items:center;gap:6px}
.drill-feedback b svg{width:15px;height:15px;flex-shrink:0}
.lesson-reading .drill-feedback p{font-size:12px;margin:5px 0 0;color:inherit}
.drill-feedback p svg{width:13px;vertical-align:-2px}
.drill-feedback.success{background:var(--success-bg);border-color:var(--success-line);color:var(--success-text)}
.drill-feedback.error{background:var(--error-bg);border-color:var(--error-line);color:var(--error-text)}
.drill-feedback>pre{font-size:11px;margin-top:8px;max-height:160px;overflow:auto}
.drill-diff{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:8px}
.drill-diff span{display:block;font-size:9px;letter-spacing:.6px;text-transform:uppercase;margin-bottom:3px}
.drill-diff pre{background:var(--paper);color:var(--text);padding:7px 9px;border-radius:4px;font-size:11px;max-height:120px;overflow:auto}
.drill-extra .hint{margin:10px 0 0!important}
.drill-reveal{margin-top:12px;padding:12px 14px;border:1px dashed var(--accent-line);border-radius:5px;background:var(--paper);font-size:12px;color:var(--text)}
.drill-reveal>pre{margin:8px 0;font-size:12px}
.lesson-reading .drill-reveal .example-code{margin:8px 0}
.lesson-reading .drill-reveal p{font-size:12px;margin:6px 0 0}
.drill-reveal .button{margin-top:4px}
.mistake{margin:14px 0 22px}
.lesson-reading .mistake-input{font-size:12px;margin:0 0 8px;color:var(--muted)}
.mistake-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:10px}
.mistake-col{border:1px solid var(--line);border-radius:5px;overflow:hidden;background:var(--paper);display:flex;flex-direction:column;min-width:0}
.mistake-col>b{font-size:10px;letter-spacing:.8px;text-transform:uppercase;padding:7px 12px;border-bottom:1px solid var(--line)}
.mistake-col.bad>b{background:var(--error-bg);color:var(--error-text)}
.mistake-col.good>b{background:var(--success-bg);color:var(--success-text)}
.mistake-col pre{padding:10px 12px;font-size:12px;line-height:1.7;color:var(--accent-text);flex:1}
.mistake-out{border-top:1px solid var(--line-soft);padding:7px 12px;font-size:11px;background:var(--tint-1)}
.mistake-out span{display:block;font-size:9px;letter-spacing:.6px;text-transform:uppercase;color:var(--muted);margin-bottom:2px}
.mistake-out code{white-space:pre-wrap;overflow-wrap:anywhere;color:var(--text)}
.mistake-col.bad .mistake-out code{color:var(--error-text)}
.lesson-reading .mistake-why{font-size:13px;margin:9px 0 0}
.remember{border:1px solid var(--soft-line);background:var(--soft);border-radius:6px;padding:14px 18px;margin:22px 0}
.remember>b{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--accent-text)}
.remember>b svg{width:16px;height:16px}
.remember ul{margin:8px 0 0;padding-left:20px;font-size:13px;line-height:1.85;color:var(--text)}
.remember li{margin:3px 0}
.deep-more{border:1px solid var(--soft-line);border-radius:6px;padding:0 16px;margin:24px 0;background:var(--paper)}
.deep-more>summary{font-size:13px;font-weight:600;color:var(--accent-text);cursor:pointer;padding:14px 0}
.deep-more[open]>summary{border-bottom:1px solid var(--line);margin-bottom:16px}
@media(max-width:760px){.drill-diff{grid-template-columns:1fr}.drill{padding:13px 12px}.deep-more{padding:0 12px}.run-io{grid-template-columns:54px minmax(0,1fr)}}