:root{color-scheme:light dark;--bg: light-dark(#f2f5ef, #0d120f);--surface: light-dark(#ffffff, #171c18);--surface-2: light-dark(#e8ede6, #202720);--text: light-dark(#182019, #edf4ee);--muted: light-dark(#687269, #a3aea5);--border: light-dark(#d5dcd3, #343d36);--accent: light-dark(#176b45, #7ae1ac);--accent-soft: light-dark(#dcf3e5, #153728);--danger: light-dark(#a1352d, #ff9b91);--warning: light-dark(#8a570c, #f4bd65);--code-bg: #101713;--code-text: #d9f5e2;--radius-sm: 8px;--radius-md: 13px;--radius-lg: 18px;--shadow: 0 12px 32px color-mix(in srgb, var(--text) 8%, transparent);font-family:Inter,Pretendard,Noto Sans KR,system-ui,-apple-system,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;min-width:320px;min-height:100vh;color:var(--text);background:var(--bg)}button,input{font:inherit}a{color:inherit}:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;z-index:100;left:16px;top:-80px;padding:10px 14px;color:var(--surface);background:var(--text);border-radius:var(--radius-sm)}.skip-link:focus{top:12px}.app-shell{min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:20px;min-height:68px;padding:11px clamp(16px,3vw,34px);border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--surface) 94%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;white-space:nowrap}.brand h1{margin:0;font-size:18px;font-weight:700}.brand-mark{display:grid;place-items:center;width:36px;height:36px;color:#f7fff9;background:#176b45;border-radius:10px;font-family:ui-monospace,monospace;font-size:13px;font-weight:700}.global-search{position:relative;flex:1;max-width:680px;margin-inline:auto}.global-search input,.field-label input,.field-label select{width:100%;min-height:42px;padding:0 14px;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:11px}.search-results{position:absolute;top:50px;left:0;right:0;z-index:30;overflow:hidden;padding:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow)}.search-results button{display:grid;grid-template-columns:86px 1fr;width:100%;padding:10px;color:var(--text);text-align:left;background:transparent;border:0;border-radius:9px;cursor:pointer}.search-results button:hover{background:var(--accent-soft)}.search-results button span{grid-row:1 / 3;color:var(--accent);font-size:12px;font-weight:700}.search-results button small{overflow:hidden;color:var(--muted);text-overflow:ellipsis;white-space:nowrap}.search-results p{margin:12px;color:var(--muted)}.progress-summary{color:var(--accent);font-size:14px;white-space:nowrap}.app-body{display:grid;grid-template-columns:220px minmax(0,1fr);min-height:calc(100vh - 68px)}.primary-nav{padding:24px 14px;border-right:1px solid var(--border);background:var(--surface)}.nav-label{margin:0 10px 10px;color:var(--muted);font-size:12px;letter-spacing:.08em;text-transform:uppercase}.primary-nav a{display:block;margin:3px 0;padding:10px 12px;color:var(--muted);border-radius:var(--radius-sm);text-decoration:none}.primary-nav a.active{color:var(--accent);background:var(--accent-soft);font-weight:600}#main-content{min-width:0;padding:clamp(22px,4vw,54px)}.welcome-page{max-width:860px;padding:clamp(28px,6vw,70px) 0}.eyebrow{margin:0 0 10px;color:var(--accent);font-size:14px;font-weight:700}.welcome-page h2{max-width:760px;margin:0;font-size:clamp(34px,6vw,64px);line-height:1.08;letter-spacing:-.035em}.lead{max-width:660px;margin:22px 0 0;color:var(--muted);font-size:clamp(17px,2vw,21px);line-height:1.7}.page-stack{max-width:1180px;margin:0 auto}.page-header{max-width:780px;margin-bottom:28px}.page-header h2{margin:0;font-size:clamp(32px,5vw,52px);letter-spacing:-.035em}.page-header>p:last-child{color:var(--muted);font-size:17px;line-height:1.7}.filter-bar{display:grid;grid-template-columns:minmax(220px,1fr) 180px;gap:12px;padding:16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.field-label{display:grid;gap:7px;color:var(--muted);font-size:12px;font-weight:700}.result-count{color:var(--muted);font-size:13px}.command-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.command-card{min-width:0;padding:19px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.card-row{display:flex;align-items:center;gap:8px;margin-bottom:14px}.favorite-button{margin-left:auto;padding:3px 7px;color:var(--warning);background:transparent;border:0;font-size:20px;cursor:pointer}.risk,.category{padding:4px 8px;border-radius:999px;font-size:11px;font-weight:700}.risk-safe{color:var(--accent);background:var(--accent-soft)}.risk-caution{color:var(--warning);background:color-mix(in srgb,var(--warning) 12%,transparent)}.risk-danger{color:var(--danger);background:color-mix(in srgb,var(--danger) 12%,transparent)}.category{color:var(--muted);background:var(--surface-2)}.command-line{display:block;overflow-x:auto;padding:13px;color:var(--code-text);background:var(--code-bg);border-radius:var(--radius-sm);white-space:pre}.command-card p{color:var(--muted);line-height:1.6}.command-card details{margin:14px 0;padding-top:12px;border-top:1px solid var(--border)}.command-card summary{cursor:pointer;font-weight:600}.command-card pre{overflow-x:auto;padding:12px;color:var(--code-text);background:var(--code-bg);border-radius:var(--radius-sm);white-space:pre-wrap}.error-note{color:var(--danger)!important;font-size:13px}.secondary-button{min-height:38px;padding:0 12px;color:var(--accent);background:transparent;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer}.secondary-button:hover{background:var(--accent-soft)}.command-anatomy{margin:16px 0;padding-top:14px;border-top:1px solid var(--border)}.command-anatomy>summary{cursor:pointer;font-weight:700}.command-anatomy-body{display:grid;gap:16px;padding-top:14px}.command-lexemes{display:flex;gap:6px;max-width:100%;overflow-x:auto;padding:5px 2px 10px}.command-lexemes button{display:grid;flex:0 0 auto;place-items:center;min-width:44px;min-height:48px;padding:6px 9px;color:var(--code-text);background:var(--code-bg);border:1px solid transparent;border-radius:8px;cursor:pointer}.command-lexemes button[aria-pressed=true]{color:var(--accent);background:var(--accent-soft);border-color:var(--accent)}.command-lexemes small{margin-top:4px;color:var(--muted);font:10px/1.2 system-ui,sans-serif}.lexeme-detail{min-width:0;padding:16px;background:var(--surface-2);border-radius:var(--radius-sm)}.lexeme-detail .detail-kicker{margin:0;color:var(--accent);font-size:11px;font-weight:800}.lexeme-detail h4{margin:5px 0 8px;font-size:19px}.lexeme-detail p{margin:0}.lexeme-detail dl{display:grid;gap:7px;margin:14px 0 0}.lexeme-detail dl div{display:grid;grid-template-columns:48px 1fr;gap:9px;padding-top:7px;border-top:1px solid var(--border)}.lexeme-detail dd{margin:0;color:var(--muted);font-size:13px;line-height:1.5}.command-flow{display:grid;gap:5px;margin:0!important;padding:14px 16px;background:var(--accent-soft);border-radius:var(--radius-sm)}.command-flow strong{color:var(--accent);font-size:12px}.command-impact-grid,.command-guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.command-impact-grid section,.command-guide-grid section{min-width:0;padding:15px;background:var(--surface-2);border-radius:var(--radius-sm)}.command-impact-grid h4,.command-guide-grid h4,.safer-alternatives h4{margin:0 0 9px;font-size:14px}.command-impact-grid ul{padding-left:18px;margin:0;color:var(--muted);font-size:13px;line-height:1.55}.security-callout{border-left:4px solid var(--warning)}.security-callout h4{color:var(--warning)}.safer-alternatives>div{display:grid;gap:7px}.safer-alternatives>div>details{padding:10px 12px;background:var(--surface-2);border-radius:var(--radius-sm)}.safer-alternatives>div>details>summary{display:grid;gap:5px;cursor:pointer}.safer-alternatives summary span{color:var(--muted);font-size:12px;line-height:1.45}.command-guide-list{display:grid;gap:9px;padding-left:19px;margin:0;color:var(--muted);font-size:13px;line-height:1.5}.command-guide-list code{display:block;overflow-x:auto;margin-top:5px;padding:7px;color:var(--code-text);background:var(--code-bg);border-radius:6px;white-space:nowrap}.command-anatomy-compact{margin:8px 0 0;padding-top:8px}.command-anatomy-compact>summary{color:var(--accent);font-size:12px}.learning-hero{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(28px,5vw,70px);align-items:center;padding:clamp(30px,6vw,80px) 0}.learning-hero h2{margin:0;font-size:clamp(42px,6vw,72px);line-height:1.05;letter-spacing:-.05em}.learning-hero>div>p:not(.eyebrow){max-width:620px;color:var(--muted);font-size:18px;line-height:1.7}.hero-actions{display:flex;gap:16px;align-items:center;margin-top:28px}.primary-button{display:inline-grid;place-items:center;min-height:48px;padding:0 18px;color:#fff;background:#176b45;border-radius:10px;text-decoration:none;font-weight:700}.secondary-link{color:var(--accent);font-weight:700;text-underline-offset:4px}.hero-terminal{display:grid;min-width:0;gap:10px;overflow:hidden;padding:25px;color:var(--code-text);background:var(--code-bg);border:1px solid #30433a;border-radius:var(--radius-lg);box-shadow:var(--shadow);font:14px/1.6 ui-monospace,monospace;transform:rotate(1deg)}.hero-terminal span{color:#7ae1ac}.hero-terminal strong{color:#f4bd65;font-weight:500}.stat-row{display:grid;grid-template-columns:repeat(4,1fr);margin-bottom:70px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}.stat-row div{display:flex;align-items:baseline;gap:8px;padding:18px 22px;border-right:1px solid var(--border)}.stat-row div:last-child{border:0}.stat-row strong{font-size:28px}.stat-row span{color:var(--muted);font-size:13px}.section-heading{margin:54px 0 20px}.section-heading h3{margin:0;font-size:clamp(27px,4vw,40px)}.lab-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.lab-card{min-height:210px;padding:22px;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);text-decoration:none;transition:transform .18s,border-color .18s}.lab-card:hover{transform:translateY(-3px);border-color:var(--accent)}.lab-card>span{color:var(--accent);font:700 12px ui-monospace,monospace}.lab-card h4{margin:24px 0 9px;font-size:20px}.lab-card p{color:var(--muted);line-height:1.6}.lab-card b{color:var(--accent);font-size:13px}.curriculum-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.chapter-card{display:grid;grid-template-columns:56px 1fr;gap:14px;padding:22px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.chapter-number{color:var(--accent);font:700 24px ui-monospace,monospace}.chapter-card h4{margin:0;font-size:21px}.chapter-card p{color:var(--muted);font-size:13px}.chapter-card ol{padding:0;margin:18px 0 0;list-style:none}.chapter-card li{display:grid;grid-template-columns:1fr auto;gap:10px;padding:10px 0;border-top:1px solid var(--border)}.chapter-card li a{text-decoration:none}.chapter-card li a:hover{color:var(--accent)}.chapter-card li span{color:var(--muted);font-size:11px}.terminal-panel{margin:34px 0;overflow:hidden;border:1px solid #34433b;border-radius:var(--radius-lg);background:#101713;box-shadow:var(--shadow)}.terminal-toolbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px;padding:11px 15px;color:#aab8af;background:#19221d;border-bottom:1px solid #34433b;font-size:12px}.terminal-toolbar>span:last-child{justify-self:end}.terminal-dot{display:inline-block;width:10px;height:10px;margin-right:6px;border-radius:50%}.terminal-dot.red{background:#ff756d}.terminal-dot.yellow{background:#f4bd65}.terminal-dot.green{background:#61d795}.terminal-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(250px,.65fr);min-height:480px}.terminal-screen{overflow:auto;min-height:460px;max-height:620px;padding:22px;color:var(--code-text);font:14px/1.65 ui-monospace,monospace}.terminal-screen pre{margin:0 0 10px;white-space:pre-wrap;font:inherit}.terminal-command{color:#fff}.terminal-success{color:#7ae1ac}.terminal-warning,.terminal-hint{color:#f4bd65}.terminal-error{color:#ff9b91}.terminal-prompt{display:flex;align-items:center;gap:8px;color:#7ae1ac}.terminal-prompt input{flex:1;min-width:0;padding:8px 0;color:#fff;caret-color:#7ae1ac;background:transparent;border:0;outline:0;font:inherit}.terminal-command-explanation{margin:-4px 0 14px;padding:8px 10px;color:var(--text);background:#17201b;border:1px solid #34433b;border-radius:8px;font-family:system-ui,sans-serif}.terminal-command-explanation>summary{color:#7ae1ac;cursor:pointer;font-size:12px;font-weight:700}.terminal-command-explanation .command-anatomy{border-color:#405147}.lab-guide{padding:22px;color:#d9e5dc;background:#17201b;border-left:1px solid #34433b}.guide-label{margin:0 0 10px;color:#8ea095;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.objective-list{padding:0;margin:0 0 25px;list-style:none}.objective-list li{display:flex;gap:9px;margin:9px 0;color:#aab8af}.objective-list li.done{color:#7ae1ac}.recommended-commands{display:grid;gap:7px}.recommended-command>button{width:100%;overflow:hidden;padding:9px;color:#d9f5e2;text-align:left;background:#101713;border:1px solid #34433b;border-radius:7px;cursor:pointer}.recommended-commands code{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.recommended-command .command-anatomy{border-color:#405147}.recommended-command .command-anatomy>summary{color:#7ae1ac}.hint-button,.reset-button{width:100%;min-height:40px;margin-top:16px;color:#d9e5dc;background:transparent;border:1px solid #405147;border-radius:8px;cursor:pointer}.hint-text{color:#f4bd65;font-size:13px;line-height:1.5}.reset-button{color:#aab8af;border:0}.safety-note{margin:0;padding:10px 16px;color:#8ea095;background:#17201b;border-top:1px solid #34433b;font-size:11px;text-align:center}.breadcrumb{display:flex;gap:8px;color:var(--muted);font-size:13px}.breadcrumb a{color:var(--accent)}.lesson-page{max-width:1120px;margin:0 auto}.lesson-header{max-width:800px;padding:45px 0 28px}.lesson-header h2{margin:0;font-size:clamp(37px,6vw,62px);line-height:1.1;letter-spacing:-.04em}.lesson-header>p{color:var(--muted);font-size:19px;line-height:1.65}.lesson-header small{color:var(--muted)}.lesson-body{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:44px}.objective-box{padding:22px 25px;background:var(--accent-soft);border-radius:var(--radius-md)}.objective-box h3{margin-top:0}.objective-box li{margin:8px 0}.lesson-section{padding:24px 0;border-bottom:1px solid var(--border)}.lesson-section h3{font-size:25px}.lesson-section p{color:var(--muted);font-size:17px;line-height:1.8}.lesson-section pre{overflow-x:auto;padding:18px;color:var(--code-text);background:var(--code-bg);border-radius:var(--radius-md)}.lesson-rail{align-self:start;position:sticky;top:92px}.lesson-rail h3{margin-top:0;font-size:15px}.mini-module{display:grid;gap:5px;margin-bottom:8px;padding:13px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);text-decoration:none}.mini-module:hover{border-color:var(--accent)}.mini-module span{color:var(--muted);font-size:12px;line-height:1.5}.sources{display:flex;flex-wrap:wrap;gap:8px;margin:32px 0;padding:20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.sources h3{width:100%;margin:0 0 8px}.sources a{padding:7px 10px;color:var(--accent);background:var(--accent-soft);border-radius:7px;font-size:12px}.next-lesson{display:grid;gap:6px;margin-left:auto;max-width:440px;padding:22px;text-align:right;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);text-decoration:none}.next-lesson span{color:var(--muted);font-size:12px}.empty-state{padding:80px 0;text-align:center}.flow-strip{display:flex;align-items:center;justify-content:center;gap:9px;overflow-x:auto;margin-bottom:20px;padding:14px;color:var(--muted);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);white-space:nowrap}.flow-strip span{padding:6px 9px;color:var(--text);background:var(--surface-2);border-radius:6px}.flow-strip b{color:var(--accent)}.architecture-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:16px;align-items:start}.module-map{display:grid;gap:10px}.module-lane{padding:15px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.module-lane>header{display:grid;grid-template-columns:170px 1fr;align-items:baseline;gap:12px}.module-lane h3{margin:0;font-size:16px}.module-lane header p{margin:0;color:var(--muted);font-size:12px}.module-lane>div{display:grid;grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:8px;margin-top:12px}.module-lane button{display:grid;gap:5px;min-height:84px;padding:12px;color:var(--text);text-align:left;background:var(--bg);border:1px solid var(--border);border-radius:9px;cursor:pointer}.module-lane button span{color:var(--muted);font-size:11px;line-height:1.4}.module-lane button.related{border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}.module-lane button.selected{color:var(--accent);background:var(--accent-soft);border-color:var(--accent)}.module-detail{position:sticky;top:92px;padding:22px;color:#edf4ee;background:#182019;border-radius:var(--radius-md)}.detail-kicker{color:#7ae1ac;font-size:11px;font-weight:800;letter-spacing:.08em}.module-detail h3{margin:8px 0;color:#fff;font-size:30px}.module-detail p{color:#c4cec6;line-height:1.65}.module-detail .module-role{color:#7ae1ac;font-weight:700}.module-detail dl{margin:18px 0}.module-detail dl div{padding:10px 0;border-top:1px solid #34433b}.module-detail dt{color:#a3aea5;font-size:11px}.module-detail dd{margin:4px 0 0;color:#edf4ee;font-size:13px}.module-detail h4{margin-bottom:7px}.module-detail ul{padding-left:20px;color:#c4cec6;font-size:13px}.detail-command{display:block;overflow-x:auto;margin:6px 0;padding:9px;color:#d9f5e2;background:#101713;border-radius:6px;white-space:nowrap}.architecture-explainer{margin-top:20px;padding:24px;background:var(--accent-soft);border-radius:var(--radius-md)}.architecture-explainer h3{margin-top:0}.architecture-explainer p{margin-bottom:0;color:var(--muted);line-height:1.7}.relationship-card{display:grid;grid-template-columns:330px 1fr;gap:36px;align-items:center;margin-bottom:28px;padding:28px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg)}.outer-ring{display:grid;place-items:center;height:260px;padding:18px;color:var(--muted);text-align:center;background:var(--surface-2);border:2px solid var(--border);border-radius:50%}.inner-ring{display:grid;place-items:center;width:150px;height:150px;color:#fff;background:#176b45;border-radius:50%}.inner-ring strong{align-self:end;font-size:38px}.inner-ring small{align-self:start;max-width:100px}.relationship-card p{color:var(--muted);font-size:17px;line-height:1.8}.comparison-table{overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-md)}.comparison-table>div{display:grid;grid-template-columns:150px 1fr 1fr}.comparison-table>div>*{margin:0;padding:17px;border-top:1px solid var(--border);border-right:1px solid var(--border);line-height:1.55}.comparison-table>div>*:last-child{border-right:0}.comparison-head{color:#fff;background:#176b45}.comparison-head>*{border-top:0!important}.comparison-table p{color:var(--muted)}.tradeoff-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px}.tradeoff-grid article{padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.tradeoff-grid article h3{margin-top:0;font-size:26px}.tradeoff-grid h4{margin-bottom:6px;color:var(--accent)}.tradeoff-grid li{margin:7px 0;color:var(--muted);line-height:1.5}.decision-guide{margin-top:20px;padding:28px;color:#fff;background:#176b45;border-radius:var(--radius-lg)}.decision-guide h3{margin-top:0}.decision-guide>div{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.decision-guide p{padding:16px;background:#115636;border-radius:10px;line-height:1.6}.decision-guide p strong{display:block;margin-bottom:7px}.decision-guide small{color:#c8f0da}.trouble-search{display:grid;gap:7px;max-width:720px;margin-bottom:20px;color:var(--muted);font-size:12px;font-weight:700}.trouble-search input{min-height:50px;padding:0 16px;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.trouble-list{display:grid;gap:12px}.trouble-card{display:grid;grid-template-columns:55px 1fr;gap:14px;padding:22px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.trouble-number{color:var(--accent);font:700 22px ui-monospace,monospace}.trouble-card h3{margin:0 0 18px;font-size:23px}.cause-list{display:flex;flex-wrap:wrap;gap:7px;align-items:center}.cause-list strong{margin-right:5px;font-size:12px}.cause-list span{padding:6px 9px;color:var(--danger);background:color-mix(in srgb,var(--danger) 8%,transparent);border-radius:7px;font-size:12px}.diagnostic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.diagnostic-grid section{margin-top:18px;padding:16px;background:var(--bg);border-radius:9px}.diagnostic-grid h4{margin-top:0}.diagnostic-grid li{margin:8px 0;color:var(--muted);line-height:1.55}.issue-commands{display:grid;gap:6px;margin-top:12px}.issue-commands code{font-size:11px}.hero-terminal .command-anatomy{border-color:#405147;font-family:system-ui,sans-serif}.hero-terminal .command-anatomy>summary{color:#7ae1ac}.hero-terminal .command-anatomy-body{color:var(--text);font-family:system-ui,sans-serif}.module-detail .command-anatomy{border-color:#405147}.module-detail .command-anatomy>summary{color:#7ae1ac}.quiz-card{max-width:760px;margin:32px 0;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.quiz-card h3{font-size:22px}.quiz-options{display:grid;gap:8px}.quiz-options button{min-height:46px;padding:10px 14px;color:var(--text);text-align:left;background:var(--bg);border:1px solid var(--border);border-radius:9px;cursor:pointer}.quiz-options button.correct{color:var(--accent);background:var(--accent-soft);border-color:var(--accent)}.quiz-options button.incorrect{color:var(--danger);border-color:var(--danger)}.quiz-feedback{padding:12px;border-radius:8px}.quiz-feedback.correct{color:var(--accent);background:var(--accent-soft)}.quiz-feedback.incorrect{color:var(--danger);background:color-mix(in srgb,var(--danger) 8%,transparent)}.complete-button{display:block;min-height:46px;margin:24px 0 24px auto;padding:0 17px;color:#fff;background:#176b45;border:0;border-radius:9px;cursor:pointer}.complete-button.completed{color:var(--accent);background:var(--accent-soft);border:1px solid var(--accent)}@media(max-width:900px){.topbar{gap:10px}.global-search{display:none}.progress-summary{margin-left:auto}.app-body{grid-template-columns:1fr}.primary-nav{position:sticky;top:68px;z-index:10;display:flex;gap:4px;overflow-x:auto;padding:8px 12px;border-right:0;border-bottom:1px solid var(--border)}.primary-nav .nav-label{display:none}.primary-nav a{white-space:nowrap}#main-content{padding:24px 18px}.filter-bar,.command-grid,.command-impact-grid,.command-guide-grid,.learning-hero,.lesson-body,.terminal-layout{grid-template-columns:1fr}.learning-hero{padding-top:30px}.hero-terminal{transform:none}.stat-row{grid-template-columns:repeat(2,1fr)}.stat-row div:nth-child(2){border-right:0}.stat-row div:nth-child(-n+2){border-bottom:1px solid var(--border)}.lab-card-grid,.curriculum-grid{grid-template-columns:1fr}.lab-card{min-height:0}.terminal-screen{min-height:380px}.lab-guide{border-top:1px solid #34433b;border-left:0}.lesson-rail{position:static}.architecture-layout,.relationship-card,.tradeoff-grid,.decision-guide>div,.diagnostic-grid{grid-template-columns:1fr}.module-detail{position:static}.module-lane>header{grid-template-columns:1fr}.comparison-table{overflow-x:auto}.comparison-table>div{min-width:720px}.outer-ring{width:260px;max-width:100%;margin:auto}.trouble-card{grid-template-columns:1fr}}