:root{
  --bg:#1a1612; --panel:#221d18; --line:#3a322a; --ink:#efe9e0;
  --dim:#a2978a; --faint:#6f665c; --hi:#e8c37a; --lcd:#c9d6ac;
  --mono:Menlo,"SF Mono",Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.6 "Iowan Old Style",Palatino,Georgia,serif;}
.wrap{max-width:1180px;margin:0 auto;padding:26px 20px 60px}
header{border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:20px}
h1{font-size:26px;margin:0 0 6px;letter-spacing:-.01em}
header p{margin:0;color:var(--dim);font-size:15px;max-width:64ch}
header a{color:var(--hi)}

/* acts */
#acts{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.actbtn{appearance:none;border:1px solid var(--line);background:#241e19;color:var(--dim);
  font:14px/1.2 inherit;padding:9px 14px;border-radius:5px;cursor:pointer;text-align:left}
.actbtn b{color:var(--faint);font:600 11px/1 var(--mono);margin-right:7px}
.actbtn:hover{border-color:var(--faint);color:var(--ink)}
.actbtn[aria-current="true"]{background:#2f2620;border-color:var(--hi);color:var(--ink)}
.actbtn[aria-current="true"] b{color:var(--hi)}

.grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;align-items:start}
.grid>div{min-width:0}
/* minmax(0,1fr), never a bare 1fr: a 1fr track takes its minimum from content,
   so a long line in the listing widens the column, which widens the canvas,
   which changes its height — and the buttons move mid-step. */
@media (max-width:860px){.grid{grid-template-columns:minmax(0,1fr)}
  .grid>div:first-child{order:2}}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:14px 16px}
h2{font:600 10px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;
   color:var(--faint);margin:0 0 12px}

/* listing */
/* Fixed, not max-: the listing changes length as acts and programs switch,
   and a panel that resizes under the reader drags the whole page with it. */
#code{height:58vh;overflow:auto;font-family:var(--mono);font-size:12.5px;line-height:1.75}
.progname{font:600 10px/1 var(--mono);letter-spacing:.16em;color:var(--hi);margin:0 0 8px}
.ln{white-space:pre-wrap;overflow-wrap:anywhere}
.tok{padding:1px 3px;border-radius:3px;color:var(--ink)}
.tok.punct{color:var(--faint)}
.tok.noted{box-shadow:inset 0 -1px 0 var(--faint)}
.tok.now{background:var(--hi);color:#1a1612;font-weight:600}

/* screen */
.lcdframe{background:#0b0a09;padding:9px;border-radius:3px}
canvas{display:block;width:100%;height:auto;image-rendering:pixelated;background:var(--lcd)}
.phase{font:11px/1 var(--mono);color:var(--faint);margin-top:9px;letter-spacing:.06em}

/* stack */
/* Space Chase runs the stack from empty to eight deep mid-frame. Pin the height
   so the commentary below it stays where the reader left it. */
#stack{font-family:var(--mono);font-size:12.5px;display:flex;flex-direction:column-reverse;
  justify-content:flex-end;height:13.5em;overflow-y:auto}
.srow{display:flex;gap:9px;padding:3px 0;border-bottom:1px dotted var(--line)}
.srow b{color:var(--faint);font-weight:400;min-width:1.6em}
.srow span{color:var(--ink);word-break:break-word}
.empty{color:var(--faint);font-style:italic;font-family:inherit}

/* commentary */
#note{min-height:9em}
#note h3{margin:0 0 6px;font-size:17px}
#note p{margin:0;color:var(--dim)}
#note.live h3{color:var(--hi)}

/* Controls live directly under the screen panel, which is the one element whose
   height never changes — so the buttons never move while you are stepping. */
.bar{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0 0}
.bar button{appearance:none;border:1px solid var(--line);background:#2b241d;color:var(--ink);
  font:600 13px/1 inherit;padding:10px 16px;border-radius:5px;cursor:pointer}
.bar button:hover:not(:disabled){border-color:var(--hi)}
.bar button:disabled{opacity:.4;cursor:default}
.keys{color:var(--faint);font-size:12.5px;margin-top:10px;margin-bottom:16px}
footer{margin-top:34px;padding-top:14px;border-top:1px solid var(--line);
  color:var(--faint);font-size:13px}
footer a{color:var(--dim)}

/* the variable tree — the directory pages only */
#store{font-family:var(--mono);font-size:12.5px;max-height:15em;overflow:auto}
.drow{padding:2px 0;white-space:nowrap}
.drow b{color:var(--dim);font-weight:400}
.drow.here b{color:var(--hi);font-weight:600}
.drow i{font-style:normal;color:var(--ink);margin-left:10px}
.drow i.prog{color:var(--faint)}