:root{--bg:#f5f7fb;--panel:#fff;--ink:#172c49;--muted:#566881;--line:#d9e3ee;--blue:#255bd9;--teal:#0d7775;--soft:#eaf0fc;--code:#122239}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 system-ui,sans-serif}body.dark{--bg:#0e1929;--panel:#192a40;--ink:#edf3fb;--muted:#b7c8dc;--line:#3d526d;--blue:#a4bfff;--teal:#79ddd0;--soft:#263a55}a{color:var(--blue);text-underline-offset:3px}button,input,select,textarea{font:inherit;color:inherit}button{border:1px solid var(--line);background:var(--panel);padding:10px 14px;min-height:44px;border-radius:9px;cursor:pointer;font-weight:650}button:hover{border-color:var(--blue);background:var(--soft)}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:#255bd9;color:#fff;border-color:#255bd9}.primary:hover{background:#1946af;color:#fff}.wide{width:100%}*:focus-visible{outline:3px solid #cf8a1a;outline-offset:3px}[hidden]{display:none!important}header{display:flex;justify-content:space-between;align-items:center;background:var(--panel);border-bottom:1px solid var(--line);padding:18px 4vw}header>div{display:flex;gap:24px;align-items:center}.brand{font-size:27px;font-weight:900;text-decoration:none}.brand span{font-size:17px;color:var(--ink);margin-left:7px}main{padding:0 3vw;max-width:1880px;margin:auto}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:6vw;max-width:1350px;margin:auto;align-items:center;padding:52px 0}.eyebrow{font-size:11px;letter-spacing:1.7px;font-weight:800;color:var(--teal)}h1{font-size:clamp(40px,4.4vw,66px);letter-spacing:-2.5px;line-height:1.08;margin:18px 0}h1 em{font-style:normal;color:var(--blue)}.hero p{max-width:540px;color:var(--muted)}.hero .tagline{color:var(--ink);font-weight:700;font-size:19px}.start-card{padding:26px;border:1px solid var(--line);border-radius:18px;background:var(--panel);box-shadow:0 15px 40px #1a407612}.mini-flow{display:flex;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding-top:15px;font-size:11px;font-weight:700;color:var(--teal)}.hint,small{font-size:12px;color:var(--muted)}label{display:block;font-size:13px;font-weight:650;margin:12px 0}input:not([type=checkbox]),select,textarea{display:block;width:100%;border:1px solid var(--line);border-radius:8px;background:var(--panel);padding:10px;margin-top:5px;min-width:0}textarea{resize:vertical;min-height:80px}input[type=checkbox]{width:18px;height:18px;vertical-align:middle;margin-right:10px}.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}.actions,.chips{display:flex;gap:9px;flex-wrap:wrap;align-items:center;margin:14px 0}.chips button{font-size:12px;padding:8px 12px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.cards article,.project-card{padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:12px;min-width:0}.cards h3{margin-top:7px}h2{font-size:clamp(23px,2.3vw,31px);letter-spacing:-.6px;line-height:1.25}h3{font-size:18px}.badge{display:inline-block;font-size:11px;font-weight:700;padding:4px 9px;background:var(--soft);color:var(--teal);border-radius:20px}#notice{padding:12px 0;min-height:44px;font-size:13px;color:var(--teal)}.error{color:#b12c42!important}.projectbar,.section-head{display:flex;gap:16px;justify-content:space-between;align-items:center}.projectbar{padding:16px 0;border-top:1px solid var(--line)}.projectbar h2{margin:5px 0}.studio-grid{display:grid;grid-template-columns:170px minmax(340px,1fr) minmax(340px,1fr);gap:18px;align-items:start}.studio-grid.no-preview{grid-template-columns:170px minmax(0,1fr)}.rail{position:sticky;top:10px;min-width:0}.rail nav{display:grid;gap:6px}.rail button{font-size:12px;text-align:left;width:100%;background:none}.rail button.active{background:var(--soft);color:var(--blue);border-color:var(--blue)}.rail details button{font-family:monospace;font-size:11px;overflow-wrap:anywhere}.panel,.preview-panel{border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:20px;min-width:0}.workspace-main{min-width:0}.panel h2{margin-top:0}.preview-panel{position:sticky;top:10px}.preview-head{display:flex;justify-content:space-between;gap:12px}.preview-panel .actions{font-size:12px}.preview-panel label{margin:0;flex:1}.preview-panel button{padding:7px 10px;font-size:12px}#previewViewport{width:100%;overflow:auto;border:1px solid var(--line);border-radius:8px;background:#dbe3ed}iframe{width:100%;height:620px;border:0;display:block;background:white}#previewPanel:fullscreen{overflow:auto;background:var(--panel);position:static}#previewPanel:fullscreen iframe{height:76vh}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--code);color:#d5e6ff;border-radius:8px;padding:15px;font:12px/1.7 ui-monospace,monospace;max-height:450px;overflow:auto}#console{max-height:200px;font-size:11px}details{padding:14px 0;border-top:1px solid var(--line);margin-top:15px}summary{font-weight:700;cursor:pointer;font-size:13px}.feature{padding:10px;border:1px solid var(--line);border-radius:8px;margin:9px 0}.feature>input{font-size:13px}.feature .actions{margin:6px 0}.feature select{width:auto;font-size:12px}.feature button{padding:5px 10px;font-size:12px}.editor-wrap{display:flex;background:#122239;border-radius:8px;overflow:hidden;height:420px}.editor-wrap pre{margin:0;padding:14px 8px;min-width:40px;max-height:none;border-radius:0;line-height:1.7;overflow:hidden;color:#8ea6c2}.editor-wrap textarea{margin:0;border:0;padding:14px 10px;border-radius:0;resize:none;background:#122239;color:#e3edff;font:12px/1.7 ui-monospace,monospace;white-space:pre;tab-size:2;flex:1}.tok{color:#a6e8d2}.result{padding:12px;margin:8px 0;border-left:4px solid #a66426;background:var(--soft)}.result.pass{border-color:var(--teal)}.result small{display:block}.project-card{margin:12px 0}.education{margin:60px auto 20px;max-width:1300px}.education .cards p{font-size:14px}.file input{max-width:240px}.skip{position:absolute;left:-9999px}.skip:focus{left:20px;top:10px;background:var(--panel);z-index:10;padding:10px}footer{border-top:1px solid var(--line);padding:30px 0;font-size:13px;max-width:1300px;margin:auto}@media(max-width:1200px){.studio-grid{grid-template-columns:150px minmax(0,1fr)}.preview-panel{position:static;grid-column:2}.studio-grid.no-preview{grid-template-columns:150px minmax(0,1fr)}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:650px){main{padding:0 16px}header{padding:14px 16px}header>div>a{display:none}.hero{grid-template-columns:1fr;padding:30px 0;gap:24px}.hero h1{font-size:43px}.two,.cards{grid-template-columns:1fr}.studio-grid,.studio-grid.no-preview{display:block}.rail{position:static}.rail nav{display:flex;flex-wrap:wrap;margin-bottom:12px}.rail nav button{width:auto;flex:1 1 30%}.rail details{display:none}.preview-panel{margin-top:18px}.panel{padding:16px}.projectbar{display:block}.section-head{flex-wrap:wrap}iframe{height:540px}.start-card{padding:20px}.editor-wrap{height:360px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
/* Container queries also keep the workspace usable when text/UI is magnified. */
main{container-type:inline-size}.studio-grid{grid-template-columns:170px minmax(0,1fr) minmax(0,1fr)}
@container(max-width:1050px){.studio-grid,.studio-grid.no-preview{grid-template-columns:150px minmax(0,1fr)}.preview-panel{position:static;grid-column:2}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@container(max-width:650px){.studio-grid,.studio-grid.no-preview{display:block}.hero,.two,.cards{grid-template-columns:1fr}.rail{position:static}.rail nav{display:flex;flex-wrap:wrap}.rail nav button{width:auto;flex:1 1 30%}.preview-panel{margin-top:18px}.projectbar{display:block}}