:root{--bg:#0b1020;--panel:#121a2e;--line:#24304d;--text:#dbe4f5;--mute:#8a97b3;--acc:#7ee0c3}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font:14px/1.45 system-ui,-apple-system,Segoe UI,sans-serif;overflow:hidden}
header{display:flex;align-items:center;gap:24px;padding:10px 18px;border-bottom:1px solid var(--line);background:#0e1528}
h1{font-size:18px;margin:0;font-weight:650;letter-spacing:.2px;white-space:nowrap}
h1 .cs{background:#8b5cf6;color:#fff;border-radius:6px;padding:1px 7px;margin-right:4px}
h1 small{color:var(--mute);font-weight:400}
nav{display:flex;gap:6px;flex-wrap:wrap}
nav button{background:transparent;border:1px solid var(--line);color:var(--mute);padding:6px 12px;border-radius:999px;cursor:pointer;font:inherit}
nav button.on{background:var(--acc);color:#06221a;border-color:var(--acc);font-weight:600}
main{display:flex;height:calc(100% - 52px)}
aside{width:430px;min-width:340px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:14px;gap:12px;overflow:auto}
#code{margin:0;background:#0a0f1d;border:1px solid var(--line);border-radius:10px;padding:10px 0;font:12.5px/1.6 ui-monospace,Consolas,Menlo,monospace;overflow:auto}
#code .l{display:block;padding:0 12px 0 0;white-space:pre;transition:background .3s}
#code .l b{display:inline-block;width:34px;text-align:right;margin-right:12px;color:#46536f;font-weight:400}
#code .l.cur{background:rgba(126,224,195,.16);box-shadow:inset 3px 0 var(--acc)}
#code .kw{color:#ff7b9c}#code .ty{color:#7ee0c3}#code .st{color:#ffd580}#code .cm{color:#5f6d8c;font-style:italic}#code .nu{color:#d2a8ff}
.controls{display:flex;gap:8px;align-items:center}
.controls button{background:#1b2742;border:1px solid var(--line);color:var(--text);border-radius:8px;padding:7px 14px;cursor:pointer;font:inherit}
.controls button:hover{border-color:var(--acc)}
#counter{color:var(--mute);margin-left:auto;font-variant-numeric:tabular-nums}
#note{background:#0f1730;border:1px solid var(--line);border-left:3px solid var(--acc);border-radius:8px;padding:12px 14px;min-height:96px}
#note code{background:#1c2847;padding:1px 5px;border-radius:4px;font-size:12.5px}
#note b{color:#fff}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;color:var(--mute);font-size:12px;margin-top:auto}
.legend span{display:flex;align-items:center;gap:6px}
.sw{display:inline-block;width:14px;height:10px;border-radius:2px}
.sw.frame{background:#1f8f78}.sw.obj{background:#c98a2b}
.sw.ln{height:0;width:18px;border-top:2px solid}
.sw.ref{border-color:#6cb6ff}.sw.byref{border-color:#ffa657}.sw.cont{border-color:#d2a8ff;border-top-style:dashed}
#stage{flex:1;position:relative;overflow:hidden;perspective:2200px;cursor:grab;background:radial-gradient(ellipse at 50% 30%,#18223d 0,#0b1020 70%)}
#stage:active{cursor:grabbing}
#world{position:absolute;left:50%;top:56%;transform-style:preserve-3d}
#floor{position:absolute;transform-style:preserve-3d;background:linear-gradient(#ffffff08 1px,transparent 1px) 0 0/40px 40px,linear-gradient(90deg,#ffffff08 1px,transparent 1px) 0 0/40px 40px;border:1px solid #2a3658;border-radius:14px}
.region{position:absolute;border-radius:12px;border:2px dashed}
.region.stack{border-color:#2c7a68;background:#1f8f7814}
.region.heap{border-color:#8a6424;background:#c98a2b12}
.region label{position:absolute;left:14px;bottom:10px;font:700 22px/1 system-ui;letter-spacing:3px;text-transform:uppercase;opacity:.75}
.region.stack label{color:#55c9ac}.region.heap label{color:#e2a64a}
.region label small{display:block;font-size:12px;letter-spacing:.5px;text-transform:none;font-weight:500;margin-top:4px;opacity:.9}
.box{position:absolute;left:0;top:0;width:var(--w);height:var(--d);transform-style:preserve-3d;transition:transform .7s cubic-bezier(.2,.8,.2,1)}
.box>.f{position:absolute;backface-visibility:visible;transition:opacity .5s,filter .5s;animation:fadein .5s}
@keyframes fadein{from{opacity:0}to{opacity:1}}
.box .top{left:0;top:0;width:var(--w);height:var(--d);transform:translateZ(var(--h))}
.box .front{left:0;top:calc(var(--d) - var(--h));width:var(--w);height:var(--h);transform-origin:50% 100%;transform:rotateX(-90deg);padding:6px 8px;overflow:hidden}
.box .side{left:var(--w);top:0;width:var(--h);height:var(--d);transform-origin:0 50%;transform:rotateY(-90deg)}
.frame .top{background:#2bb394}.frame .front{background:#145e50;border:1px solid #2bb394}.frame .side{background:#0d4238}
.obj .top{background:#e3a640}.obj .front{background:#5e4116;border:1px solid #e3a640}.obj .side{background:#3d2a0d}
.obj.task .top{background:#a97ff0}.obj.task .front{background:#3c2a66;border-color:#a97ff0}.obj.task .side{background:#271a45}
.obj.sm .top{background:#f07fb0}.obj.sm .front{background:#5a2140;border-color:#f07fb0}.obj.sm .side{background:#3a1429}
.obj.str .top{background:#9fc36a}.obj.str .front{background:#33461c;border-color:#9fc36a}.obj.str .side{background:#223012}
.box.dead .f{opacity:.28;filter:grayscale(1)}
.box.cur .front{box-shadow:0 0 0 2px #fff inset}
.hd{font:600 12px/1.2 system-ui;color:#fff;display:flex;justify-content:space-between;gap:6px;margin-bottom:5px;white-space:nowrap}
.hd em{font-style:normal;font-weight:500;font-size:10.5px;padding:1px 6px;border-radius:999px;background:#0006;color:#ffe9b0}
.row{display:grid;grid-template-columns:78px 64px 1fr;gap:4px;font:11.5px/20px ui-monospace,Consolas,monospace;height:22px;padding:0 4px;border-radius:4px;background:#00000030;margin-bottom:2px;white-space:nowrap}
.row .n{color:#fff;overflow:hidden;text-overflow:ellipsis}.row .t{color:#9fb2d6;overflow:hidden;text-overflow:ellipsis}.row .v{color:#ffe08a;overflow:hidden;text-overflow:ellipsis;text-align:right}
.row.empty{background:none;color:#ffffff70;display:block;font-style:italic}
.row.chg{animation:flash 1.4s}
@keyframes flash{0%,30%{background:#ffe08a;}0%,30%{color:#000}100%{background:#00000030}}
.row.chg .v,.row.chg .n{animation:flashtxt 1.4s}
@keyframes flashtxt{0%,30%{color:#1a1200}}
.tlabel{position:absolute;font:600 13px system-ui;color:#55c9ac;white-space:nowrap}
.tlabel small{display:block;color:var(--mute);font-weight:400}
#arrows{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
#arrows path{fill:none;stroke-width:2.2}
.hint{position:absolute;right:14px;bottom:10px;color:#5f6d8c;font-size:12px}
@media (max-width:900px){main{flex-direction:column}aside{width:auto;max-height:46%;min-width:0}#stage{min-height:54%}}