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@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
@media(max-width:1000px){.topbar{gap:18px}.main-nav{margin-left:8px;gap:14px}.theme-control>span{display:none}.theme-control select{max-width:155px}.hero{min-height:570px}.track-grid{grid-template-columns:repeat(3,1fr)}.track-grid article{min-height:215px}.kernel-section{gap:35px}.install-section{padding:30px;gap:30px}}
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@media(max-width:390px){.brand{gap:6px;letter-spacing:.04em}.topbar{gap:6px}.theme-control select{max-width:105px}.hero-actions .button{gap:10px;padding:12px 10px;font-size:8px}.problem-pane{width:36%}.brief-content{padding:9px}.brief-content h3{font-size:18px}.brief-description{font-size:9px}.editor-options{gap:3px}.language-select select{max-width:70px}.splitter{width:5px}.section-heading h2{font-size:38px}}
/* GhostKernel field: an original, cursor-reactive flow field rather than the shared grid/scanline backdrop. */
body:before{z-index:-1;background:radial-gradient(ellipse at 50% 35%,color-mix(in srgb,var(--purple) 7%,transparent),transparent 48rem),linear-gradient(180deg,transparent 45%,color-mix(in srgb,var(--bg) 76%,transparent));background-size:auto;mask-image:none}
body:after{display:none}
#kernelField{position:fixed;inset:0;z-index:0;display:block;width:100vw;height:100vh;pointer-events:none;opacity:.78}
.topbar,main,.footer{position:relative;z-index:1}
@media(max-width:720px){#kernelField{opacity:.62}}
@media(prefers-reduced-motion:reduce){#kernelField{opacity:.12}}
/* Shared darkwave scrollbar treatment, including the code and mission panes. */
*{scrollbar-width:thin;scrollbar-color:var(--cyan) #0a0d13}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#0a0d13;border-left:1px solid #1a2631}
::-webkit-scrollbar-thumb{border:2px solid #0a0d13;background:linear-gradient(180deg,var(--cyan),var(--purple) 54%,var(--pink));box-shadow:inset 0 0 5px #ffffff55}
::-webkit-scrollbar-thumb:hover{background:var(--acid)}
.workbench-entry{display:flex;align-items:center;justify-content:space-between;gap:25px;margin-top:22px;margin-bottom:84px;padding:26px 30px;border:1px solid color-mix(in srgb,var(--cyan) 28%,var(--line));background:linear-gradient(100deg,color-mix(in srgb,var(--cyan) 6%,var(--panel)),var(--panel) 52%,color-mix(in srgb,var(--pink) 5%,var(--panel)))}
.workbench-entry h2{margin:0;font:700 clamp(34px,4vw,50px)/.9 var(--display)}
.workbench-entry h2 span{color:var(--pink)}
.workbench-entry>div>p:last-child{max-width:600px;margin:12px 0 0;color:var(--muted);font-size:12px}
.workbench-mode{height:100vh;height:100dvh;min-height:680px;display:flex;flex-direction:column;overflow:hidden}
.workbench-mode .topbar{flex:none}
.workbench-page{width:100%;flex:1;min-height:0;position:relative;z-index:1}
.workspace-shell{width:calc(100% - 48px);max-width:1800px;margin-inline:auto}
.workbench-mode .workbench-section{height:100%;min-height:0;display:flex;flex-direction:column;padding:14px 0}
.workbench-mode .section-heading{flex:none;margin-bottom:13px}
.workbench-mode .section-heading h2{font-size:clamp(36px,4vw,52px)}
.workbench-mode .workbench{flex:1;min-height:470px;height:auto}
.workbench-mode .problem-pane{min-height:0}
.workbench-mode .brief-content{height:100%;overflow:auto}
.workbench-mode .editor-pane{min-height:0}
.workbench-mode .editor-body{min-height:0}
.workbench-mode .console-panel{flex:none}
.workbench-mode .console-panel pre{max-height:96px;overflow:auto}
.workbench-mode .workbench-foot{flex:none;padding:8px 3px 0}
.workbench-mode .footer{flex:none;padding-top:12px;padding-bottom:14px}
@media(max-width:720px){.workbench-entry{align-items:flex-start;flex-direction:column;margin-bottom:55px;padding:20px}.workbench-mode{height:auto;min-height:100dvh;overflow:auto}.workspace-shell{width:calc(100% - 30px)}.workbench-mode .workbench-section{height:auto;min-height:calc(100dvh - 155px);padding:30px 0 10px}.workbench-mode .section-heading{align-items:flex-start;flex-direction:column;gap:8px}.workbench-mode .workbench{min-height:580px}.workbench-mode .editor-body{min-height:320px}.workbench-mode .footer{margin-top:12px}}
/* Five linked starter tracks and their reusable lesson view. */
.track-grid .track-card{position:relative;display:block;min-height:235px;padding:18px 17px;border:1px solid var(--line);border-top:2px solid var(--track,var(--cyan));background:linear-gradient(145deg,#121722,#0d1017);transition:transform .2s,border-color .2s,box-shadow .2s}.track-grid .track-card:hover,.track-grid .track-card:focus-visible{transform:translateY(-6px);border-color:var(--track);box-shadow:0 14px 30px color-mix(in srgb,var(--track) 10%,transparent);outline:none}.track-grid .track-card:nth-child(2){--track:var(--acid)}.track-grid .track-card:nth-child(3){--track:var(--pink)}.track-grid .track-card:nth-child(4){--track:var(--purple)}.track-grid .track-card:nth-child(5){--track:var(--orange)}.track-tag b{padding-left:5px;color:var(--white)}
.course-page{min-height:calc(100vh - 76px);padding:60px 0 80px}.course-hero{display:flex;align-items:end;justify-content:space-between;gap:20px;padding-bottom:25px;border-bottom:1px solid var(--line)}.course-hero h1{margin:0;font:800 clamp(48px,7vw,84px)/.9 var(--display)}.course-hero h1 span{color:var(--pink)}.course-intro{max-width:600px;color:var(--muted)}.course-progress{min-width:190px;color:var(--cyan);font:9px var(--mono)}.course-progress b{display:block;margin-top:7px;color:var(--white);font-size:18px}.progress-track{height:4px;margin-top:9px;background:var(--line)}.progress-track i{display:block;width:0;height:100%;background:var(--acid);transition:width .2s}.course-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:18px;margin-top:22px}.lesson-nav,.lesson-panel{border:1px solid var(--line);background:color-mix(in srgb,var(--panel) 92%,var(--bg))}.lesson-nav{padding:14px}.lesson-nav h2{margin:2px 0 12px;color:var(--muted);font:9px var(--mono)}.lesson-link{width:100%;display:flex;align-items:center;gap:10px;padding:12px 9px;border:0;border-top:1px solid var(--line);color:var(--muted);background:transparent;text-align:left;cursor:pointer}.lesson-link:hover,.lesson-link.active{color:var(--white);background:#21e6ff0c}.lesson-link.active{box-shadow:inset 2px 0 var(--cyan)}.lesson-link b{color:var(--cyan);font:9px var(--mono)}.lesson-link i{margin-left:auto;color:var(--acid);font-style:normal}.lesson-panel{min-height:430px;padding:clamp(20px,4vw,42px)}.lesson-panel .eyebrow{margin-bottom:10px}.lesson-panel h2{margin:0 0 14px;font:700 38px var(--display)}.lesson-panel p{max-width:760px;color:#a3b1bd;line-height:1.8}.lesson-example{margin:20px 0;padding:17px;border:1px solid var(--line);background:#080b11;color:var(--acid);font:12px/1.8 var(--mono);white-space:pre-wrap;overflow:auto}.lesson-challenge{padding:15px;border-left:2px solid var(--pink);background:#ff2f9f0b}.lesson-challenge b{display:block;margin-bottom:4px;color:var(--pink);font:9px var(--mono)}.lesson-actions{display:flex;justify-content:space-between;gap:10px;margin-top:22px}.lesson-actions button,.lesson-actions a{padding:11px 14px;border:1px solid var(--line);color:var(--white);background:#10141e;font:9px var(--mono);cursor:pointer}.lesson-actions .complete-lesson{border-color:var(--acid);color:#080910;background:var(--acid)}.lesson-actions button:disabled{opacity:.45;cursor:not-allowed}.course-tip{margin:16px 0 0;color:var(--muted);font-size:10px}
/* Home-page portal previews are compact, legible snapshots of the two dedicated experiences. */
.feature-showcase{padding:12px 0 88px;border-top:1px solid var(--line)}
.feature-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;padding:34px 0 22px}
.feature-heading h2{margin:0;font:700 clamp(38px,5vw,58px)/.9 var(--display)}
.feature-heading h2 span{color:var(--pink)}
.feature-heading>p{max-width:390px;margin:0;color:var(--muted);font-size:11px;line-height:1.7}
.feature-preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}
.feature-preview{display:block;min-width:0;border:1px solid var(--line);background:#0b1018;transition:transform .22s,border-color .22s,box-shadow .22s}
.feature-preview:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:0 18px 42px #0008,0 0 22px #21e6ff12}
.feature-preview.ghost-preview:hover{border-color:var(--acid);box-shadow:0 18px 42px #0008,0 0 22px #c3ff0012}
.preview-frame{position:relative;aspect-ratio:2.05;overflow:hidden;border-bottom:1px solid var(--line);background:radial-gradient(ellipse at 75% 30%,#17152a,#090c13 57%)}
.preview-top{position:absolute;inset:0 0 auto;height:27px;display:flex;align-items:center;gap:5px;padding:0 10px;border-bottom:1px solid #26313d;background:#0a0d13;color:#657381;font:6px var(--mono);letter-spacing:.06em}
.preview-top>i{width:5px;height:5px;border-radius:50%;background:var(--pink)}.preview-top>i:nth-child(2){background:var(--orange)}.preview-top>i:nth-child(3){background:var(--acid)}.preview-top>b{margin-left:5px;color:#aab7c3;font-size:6px;font-weight:500}.preview-top>span{margin-left:auto;color:var(--cyan);font-size:5px}
.preview-workspace{position:absolute;inset:27px 9px 9px;display:grid;grid-template-columns:.72fr 1.28fr;gap:5px;padding:6px;border:1px solid #26313d;background:#10141e;box-shadow:0 8px 20px #0007}
.preview-brief,.preview-editor{min-width:0;border:1px solid #27323e;background:#0a0e15}.preview-brief{display:flex;flex-direction:column;gap:8px;padding:9px}.preview-brief small{color:var(--purple);font:5px var(--mono)}.preview-brief>b{color:#e6f0f8;font:600 14px var(--display)}.preview-brief>i{width:88%;height:3px;background:#28313b}.preview-brief>i:nth-of-type(2){width:72%}.preview-brief>i:nth-of-type(3){width:55%}.preview-brief>span{margin-top:auto;padding-top:7px;border-top:1px solid var(--line);color:var(--orange);font:5px var(--mono)}
.preview-editor{display:flex;flex-direction:column}.preview-tabs{height:22px;padding:5px 7px;border-bottom:1px solid var(--line);color:var(--cyan);font:5px var(--mono)}.preview-tabs span{float:right;color:var(--muted)}.preview-code{flex:1;padding:8px;color:#c8d4df;font:clamp(5px,.8vw,9px)/1.9 var(--mono);white-space:nowrap}.preview-code b{display:inline-block;width:17px;color:#586574;font-weight:400}.preview-code br{line-height:1}.preview-run{padding:6px 8px;background:var(--acid);color:#090c10;font:600 5px var(--mono);text-align:center}
.ghost-shot{background:radial-gradient(ellipse at 53% 51%,#152932,#090c13 64%)}.preview-lab{position:absolute;inset:27px 9px 9px;display:grid;grid-template-columns:1fr .85fr 1fr;gap:6px;padding:7px;border:1px solid #26313d;background:#0b1018}.preview-memory,.preview-trace{display:flex;flex-direction:column;gap:7px;min-width:0;padding:7px;border:1px solid #27323e;background:#0a0e15}.preview-memory>small,.preview-trace>small{margin-bottom:3px;color:var(--muted);font:5px var(--mono)}.preview-memory>b{position:relative;padding:6px 5px;border:1px solid #25323d;color:#c9d6e2;font:600 clamp(6px,.85vw,9px) var(--display)}.preview-memory>b i{display:inline-block;width:4px;height:13px;margin-right:4px;vertical-align:middle;background:var(--purple)}.preview-memory>b:nth-of-type(2) i{background:var(--pink)}.preview-memory>b:nth-of-type(3) i{background:var(--cyan)}.preview-memory>b:nth-of-type(4) i{background:var(--orange)}.preview-memory>b span{float:right;color:var(--muted);font:5px var(--mono)}.preview-core{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px}.preview-core:before,.preview-core:after{position:absolute;content:"";border:1px solid #21e6ff52;border-radius:50%;aspect-ratio:1;width:88%;transform:scaleY(.48) rotate(-28deg)}.preview-core:after{border-color:#ff2f9f66;transform:scaleY(.7) rotate(45deg)}.preview-core>i{position:absolute;width:42%;aspect-ratio:1;border:1px solid var(--cyan);border-radius:50%;background:radial-gradient(circle,#1a4250,#090d14);box-shadow:0 0 19px #21e6ff44}.preview-core>b,.preview-core>small{z-index:1}.preview-core>b{color:var(--cyan);font:700 clamp(15px,2vw,28px) var(--display)}.preview-core>small{color:var(--acid);font:5px var(--mono)}.preview-trace p{margin:0;color:#9dabb8;font:clamp(4px,.65vw,7px) var(--mono);white-space:nowrap}.preview-trace p:first-of-type{color:var(--purple)}.preview-trace p:last-of-type{color:var(--acid)}.preview-trace>div{margin-top:auto;padding:5px;background:#c3ff00;color:#090c10;font:5px var(--mono);text-align:center}
.feature-preview-copy{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:15px 17px}.feature-preview-copy .eyebrow{margin:0 0 4px;color:var(--cyan);font-size:7px}.ghost-preview .feature-preview-copy .eyebrow{color:var(--acid)}.feature-preview-copy h3{margin:0;color:var(--white);font:600 23px var(--display)}.feature-preview-copy>div>p:last-child{max-width:470px;margin:5px 0 0;color:var(--muted);font-size:9px;line-height:1.6}.preview-arrow{color:var(--pink);font:18px var(--mono)}.ghost-preview .preview-arrow{color:var(--acid)}
@media(max-width:720px){.feature-showcase{padding-bottom:56px}.feature-heading{align-items:flex-start;flex-direction:column;gap:10px;padding-top:27px}.feature-heading h2{font-size:42px}.feature-preview-grid{grid-template-columns:1fr;gap:11px}.preview-frame{aspect-ratio:1.8}.preview-code{font-size:8px}.preview-memory>b{font-size:8px}.preview-trace p{font-size:6px}.feature-preview-copy{padding:12px}.feature-preview-copy h3{font-size:21px}}
@media(max-width:1000px){.track-grid .track-card{min-height:215px}}
@media(max-width:720px){.track-grid .track-card{min-height:195px;padding:14px 12px}.track-grid .track-card h3{font-size:19px}.track-grid .track-card p{font-size:9px}.course-page{padding:34px 0 55px}.course-hero{align-items:flex-start;flex-direction:column}.course-hero h1{font-size:53px}.course-progress{width:100%}.course-layout{grid-template-columns:1fr}.lesson-nav{padding:10px}.lesson-nav>div{display:grid;grid-template-columns:1fr 1fr;gap:4px}.lesson-link{border:1px solid var(--line);font-size:10px}.lesson-panel{min-height:0;padding:20px}.lesson-panel h2{font-size:32px}.lesson-actions button{padding:10px 8px;font-size:7px}.run-button:disabled{opacity:.6;cursor:wait}}