:root{--bg:#161b22;--panel:#1d242e;--line:#2c3644;--fg:#e6e9ee;--mut:#8b97a8;--acc:#f0b429;--err:#ff7b72}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{display:flex;flex-direction:column;background:var(--bg);color:var(--fg);font:14px/1.45 system-ui,-apple-system,"Segoe UI",sans-serif}
header{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:8px 12px;background:var(--panel);border-bottom:1px solid var(--line)}
.logo{font:700 18px Georgia,serif;margin-right:8px;letter-spacing:.3px}
.sp{flex:1}.muted{color:var(--mut)}
button,select{background:#263040;color:var(--fg);border:1px solid var(--line);border-radius:6px;padding:6px 12px;font:inherit;cursor:pointer}
button:hover:not(:disabled){border-color:var(--acc)}
button:disabled{opacity:.4;cursor:default}
button:focus-visible,select:focus-visible,.tab:focus-visible{outline:2px solid var(--acc);outline-offset:1px}
.primary{background:var(--acc);color:#1b1500;border-color:var(--acc);font-weight:600}
#tabs{display:flex;gap:2px;padding:6px 12px 0;background:var(--panel);overflow-x:auto}
.tab{padding:6px 12px;border:1px solid transparent;border-bottom:0;border-radius:6px 6px 0 0;color:var(--mut);cursor:pointer;white-space:nowrap}
.tab.on{background:#282c34;color:var(--fg);border-color:var(--line)}
.tab i{margin-left:8px;font-style:normal;opacity:.6}.tab i:hover{color:var(--err);opacity:1}
#tabs>button{border:0;background:none;font-size:18px;padding:2px 10px}
main{flex:1;display:grid;grid-template-columns:1fr 1fr;min-height:0}
#editor{min-height:0;overflow:hidden;background:#282c34}
#editor .cm-editor{height:100%}#editor .cm-scroller{font:13.5px/1.5 ui-monospace,Menlo,Consolas,monospace}
#out{overflow:auto;border-left:1px solid var(--line);padding:12px}
#console{margin:0;white-space:pre-wrap;word-break:break-word;font:13px/1.5 ui-monospace,Menlo,Consolas,monospace}
#console .err{color:var(--err)}#console .dim{color:var(--mut)}
#plots img{max-width:100%;background:#fff;border-radius:6px;margin-top:10px;display:block}
#loader{position:fixed;inset:0;background:var(--bg);display:flex;align-items:center;justify-content:center;z-index:9}
#loader.hide{display:none}
.card{width:min(440px,90vw);background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:24px}
.card h2{margin:0 0 6px;font:700 20px Georgia,serif}
.bar{height:10px;background:#0f1319;border-radius:5px;overflow:hidden;margin:14px 0 10px}
#lbar{height:100%;width:0;background:var(--acc);transition:width .2s}
#lbar.ind{width:35%;animation:slide 1.1s ease-in-out infinite alternate}
@keyframes slide{from{margin-left:0}to{margin-left:65%}}
@media(max-width:800px){main{grid-template-columns:1fr;grid-template-rows:1.2fr 1fr}#out{border-left:0;border-top:1px solid var(--line)}}
@media(prefers-reduced-motion:reduce){#lbar.ind{animation:none}}