/* ==========================================================
   Antescher — shared styles for the embeddable figures.
   Every figure in the blog post is an iframe onto one of the
   sibling .html files; this is the only stylesheet they load.
   Palette and figure styling are lifted from the standalone
   teardown at /antescher/ so the two stay visually identical.
   ========================================================== */
@import url("https://fonts.googleapis.com/css2?family=Archivo:wdth,wght@100..125,400..900&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@300;400;500;600&display=swap");

:root{
  --void:#0B0D12;
  --void-2:#12151D;
  --void-3:#1A1E28;
  --line:#3A4152;        /* decorative rules */
  --line-ui:#5A637A;     /* interactive borders - 3.04:1 on void-2 */
  --top:#C8CDD6;         /* 12.2:1 */
  --mid:#98A0AF;         /* 7.4:1  */
  --dark:#4A5160;        /* 3D face fill only, never text */
  --text:#C3C9D4;        /* 11.7:1 */
  --text-hi:#EEF1F6;     /* 17.2:1 */
  --dim:#9AA3B4;         /* 7.7:1  */
  --mag:#FF6BA8;         /* 7.3:1  */
  --mag-solid:#FF2E88;   /* fills only; #0B0D12 on it = 5.6:1 */
  --cyan:#17D6E8;        /* 10.9:1 */
}
*{box-sizing:border-box}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

html,body{margin:0}
body{
  background:var(--void);color:var(--text);
  font-family:"IBM Plex Sans",system-ui,sans-serif;
  font-weight:400;font-size:15.5px;line-height:1.6;
  padding:16px 18px;
  -webkit-font-smoothing:antialiased;
}
/* the three canvas viewers want the frame edge, not a gutter */
body.flush{padding:0}

code,.mono{font-family:"IBM Plex Mono",monospace;font-size:.88em;color:var(--top)}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:2px}
.addr{color:var(--mag);font-family:"IBM Plex Mono",monospace;font-weight:500}
.muted{color:var(--dim)}
@media (prefers-contrast:more){:root{--text:#E4E8EF;--dim:#C2C9D6;--mid:#C2C9D6;
  --mag:#FF9BC6;--line:#5A637A;--line-ui:#8892A6}}

/* ---------- 01 · byte layout ---------- */
.bytefig{border:1px solid var(--line);border-radius:3px;padding:1.4rem 1.1rem 1.1rem;
  background:var(--void-2);overflow-x:auto}
.bits{display:flex;gap:5px;min-width:min-content;justify-content:center}
.bit{width:52px;flex:0 0 52px;text-align:center;font-family:"IBM Plex Mono",monospace}
.bit .cell{height:52px;display:grid;place-items:center;border:1px solid var(--line);
  border-radius:2px;font-size:1rem;color:var(--text-hi);background:var(--void-3)}
.bit.h .cell{border-color:rgba(23,214,232,.5);color:var(--cyan)}
.bit.e .cell{border-color:rgba(255,46,136,.55);color:var(--mag)}
.bit .lbl{font-size:.76rem;color:var(--dim);margin-top:.45rem;letter-spacing:.08em}
.bracket{text-align:center;font-family:"IBM Plex Mono",monospace;font-size:.76rem;
  color:var(--dim);letter-spacing:.14em;margin-top:.9rem;line-height:1.7}

/* ---------- 01 · counted stats ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(122px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:3px;overflow:hidden}
.stat{background:var(--void-2);padding:1.1rem .95rem}
.stat .v{font-family:"Archivo",sans-serif;font-variation-settings:"wdth" 112;font-weight:800;
  font-size:1.85rem;color:var(--text-hi);line-height:1}
.stat .l{font-family:"IBM Plex Mono",monospace;font-size:.76rem;letter-spacing:.13em;
  text-transform:uppercase;color:var(--dim);margin-top:.45rem;line-height:1.5}

/* ---------- 02 · memory map ---------- */
.memmap{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:3px;
  overflow:hidden;font-family:"IBM Plex Mono",monospace;font-size:.78rem}
.memrow{display:grid;grid-template-columns:4.6rem 1fr 4.8rem;gap:.5rem;align-items:center;
  padding:.62rem .9rem;border-bottom:1px solid var(--line);background:var(--void-2)}
.memrow:last-child{border-bottom:0}
.memrow .a{color:var(--mag)}
.memrow .n{color:var(--text-hi);font-family:"IBM Plex Sans";font-weight:400;font-size:.92rem}
.memrow .s{color:var(--dim);text-align:right;font-size:.76rem}
.memrow.code{background:linear-gradient(90deg,rgba(255,46,136,.14),transparent 62%)}
.memrow.city{background:linear-gradient(90deg,rgba(23,214,232,.13),transparent 62%)}

/* ---------- 03 · walk orders ---------- */
.walks{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.9rem}
.walk{border:1px solid var(--line);border-radius:3px;padding:1rem;background:var(--void-2);text-align:center}
.walk h4{margin:0 0 .7rem;font-family:"IBM Plex Mono",monospace;font-size:.74rem;
  letter-spacing:.14em;color:var(--dim);font-weight:500;text-transform:uppercase}
.walk .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:3px;max-width:104px;margin:0 auto .7rem}
.walk .grid span{aspect-ratio:1;display:grid;place-items:center;background:var(--void-3);
  border:1px solid var(--line);border-radius:2px;font-family:"IBM Plex Mono",monospace;
  font-size:.75rem;color:var(--mid)}
.walk .grid span.first{background:var(--mag);color:#0B0D12;border-color:var(--mag);font-weight:600}
.walk .grid span.last{border-color:var(--cyan);color:var(--cyan)}
.walk code{font-size:.76rem;color:var(--top)}

/* ---------- 04 · masked blit ---------- */
.blit{display:grid;gap:1.1rem;grid-template-columns:repeat(2,1fr)}
@media(min-width:640px){.blit{grid-template-columns:repeat(4,1fr)}}
.blitcell{border:1px solid var(--line);border-radius:3px;background:var(--void-2);padding:.85rem;text-align:center}
.blitcell canvas{width:100%;max-width:150px;image-rendering:pixelated;
  border:1px solid var(--line);border-radius:2px;background:#000}
.blitcell .op{font-family:"IBM Plex Mono",monospace;font-size:.73rem;letter-spacing:.09em;
  color:var(--dim);margin-top:.6rem;line-height:1.5}
.blitcell .op b{color:var(--cyan);font-weight:500}

/* ---------- 04 · sprite slot table ---------- */
.sprtab{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.7rem}
.sgroup{border:1px solid var(--line);border-radius:3px;padding:.8rem;background:var(--void-2)}
.sgroup .gt{font-family:"IBM Plex Mono",monospace;font-size:.76rem;letter-spacing:.1em;
  color:var(--dim);margin-bottom:.55rem}
.sgroup .gn{font-size:.82rem;color:var(--text-hi);margin-bottom:.6rem;font-weight:400}
.dirs{display:flex;gap:4px}
.dirs span{flex:1;text-align:center;padding:.32rem 0;border:1px solid var(--line);
  border-radius:2px;font-family:"IBM Plex Mono",monospace;font-size:.76rem;color:var(--mid)}

/* ---------- 05 · entity record ---------- */
table{width:100%;border-collapse:collapse;font-size:.83rem;
  font-family:"IBM Plex Mono",monospace;margin:0}
th{text-align:left;font-weight:500;color:var(--dim);font-size:.73rem;letter-spacing:.13em;
  text-transform:uppercase;padding:.5rem .7rem;border-bottom:1px solid var(--line)}
td{padding:.5rem .7rem;border-bottom:1px solid var(--void-3);color:var(--text)}
tr:hover td{background:var(--void-2)}
td:first-child,td:nth-child(3){color:var(--mag)}

/* ---------- mermaid diagrams ---------- */
.dia{border:1px solid var(--line);border-radius:3px;background:var(--void-2);
  padding:1.3rem .8rem;overflow-x:auto}
.dia .mermaid{display:flex;justify-content:center;min-width:min-content}

/* ---------- the three canvas viewers ---------- */
.viewer{border:1px solid var(--line);background:
  linear-gradient(180deg,var(--void-2),var(--void));overflow:hidden}
.viewer-stage{position:relative;aspect-ratio:16/9;min-height:280px;background:
  radial-gradient(ellipse at 50% 44%,#171B25 0%,#0B0D12 72%)}
.viewer-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.viewer-bar{display:flex;flex-wrap:wrap;gap:.55rem 1.4rem;align-items:center;
  padding:.85rem 1.1rem;border-top:1px solid var(--line);background:var(--void-2)}
.seg{display:flex;border:1px solid var(--line-ui);border-radius:2px;overflow:hidden}
.seg button{background:transparent;border:0;border-right:1px solid var(--line-ui);
  color:var(--text);font-family:"IBM Plex Mono",monospace;font-size:.78rem;letter-spacing:.1em;
  padding:.62rem .9rem;min-height:44px;cursor:pointer;transition:background .14s,color .14s}
.seg button:last-child{border-right:0}
.seg button:hover{color:var(--top);background:var(--void-3)}
.seg button[aria-pressed="true"]{background:var(--mag-solid);color:#07080C;font-weight:600}
.ctl{display:flex;align-items:center;gap:.6rem;font-family:"IBM Plex Mono",monospace;
  font-size:.75rem;letter-spacing:.1em;color:var(--dim)}
input[type=range]{-webkit-appearance:none;appearance:none;height:4px;background:var(--line-ui);
  width:118px;border-radius:2px;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;
  background:var(--cyan);border-radius:50%;cursor:pointer}
input[type=range]::-moz-range-thumb{width:18px;height:18px;background:var(--cyan);
  border:0;border-radius:50%;cursor:pointer}
.readout{margin-left:auto;font-family:"IBM Plex Mono",monospace;font-size:.75rem;
  color:var(--dim);letter-spacing:.06em}
.readout b{color:var(--cyan);font-weight:500}

kbd{font-family:"IBM Plex Mono",monospace;font-size:.72rem;background:var(--void-3);
  border:1px solid var(--line-ui);border-radius:3px;padding:.2rem .42rem;color:var(--text);
  min-width:1.9em;text-align:center;display:inline-block}
.fp-stage,.game-stage{aspect-ratio:16/10;min-height:320px;background:#0B0D12;cursor:default}
.fp-stage canvas#fp,.game-stage canvas#game{position:absolute;inset:0;width:100%;height:100%;
  display:block;image-rendering:auto}
.fp-stage.running{cursor:grab}
.fp-stage.running:active{cursor:grabbing}
canvas.mini{position:absolute;inset:auto 12px auto auto;width:112px;height:112px;
  border:1px solid var(--line-ui);border-radius:2px;background:rgba(7,8,12,.82);
  image-rendering:pixelated}
.bigbtn{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  font-family:"Archivo",sans-serif;font-variation-settings:"wdth" 112;font-weight:800;
  text-transform:uppercase;letter-spacing:.06em;font-size:1rem;
  background:var(--mag-solid);color:#07080C;border:0;border-radius:3px;
  padding:.95rem 1.9rem;cursor:pointer;transition:transform .14s}
.bigbtn:hover{transform:translate(-50%,-50%) scale(1.035)}
.bigbtn[hidden]{display:none}
/* game-over state: banner and restart button both show at once, so drop the
   button below the banner instead of stacking two centered elements */
.bigbtn.stacked{top:auto;bottom:9%;transform:translateX(-50%)}
.bigbtn.stacked:hover{transform:translateX(-50%) scale(1.035)}
.hud{position:absolute;left:0;right:0;top:0;display:flex;gap:1.4rem;flex-wrap:wrap;
  padding:.7rem 1rem;background:linear-gradient(180deg,rgba(7,8,12,.9),transparent);
  font-family:"IBM Plex Mono",monospace;font-size:.74rem;letter-spacing:.11em;color:var(--dim)}
.hud b{color:var(--cyan);font-weight:600}
.banner{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  background:rgba(7,8,12,.94);border:1px solid var(--line-ui);border-radius:3px;
  padding:1.2rem 1.8rem;text-align:center;max-width:80%;
  font-family:"Archivo",sans-serif;font-variation-settings:"wdth" 110;font-weight:700;
  text-transform:uppercase;letter-spacing:.04em;color:var(--text-hi);font-size:1.05rem}
.banner small{display:block;font-family:"IBM Plex Sans";font-weight:400;text-transform:none;
  letter-spacing:0;color:var(--dim);font-size:.82rem;margin-top:.5rem}
.banner[hidden]{display:none}
.touchpad{display:none;gap:.5rem;flex-wrap:wrap;padding:.7rem 1.1rem;background:var(--void-2);
  border-top:1px solid var(--line)}
.touchpad button{flex:1;min-width:62px;min-height:52px;background:var(--void-3);
  border:1px solid var(--line-ui);border-radius:3px;color:var(--text);
  font-family:"IBM Plex Mono",monospace;font-size:.8rem;cursor:pointer;
  -webkit-user-select:none;user-select:none;touch-action:manipulation}
.touchpad button:active{background:var(--mag-solid);color:#07080C}
@media (hover:none) and (pointer:coarse){
  .touchpad{display:flex}
  canvas.mini{width:82px;height:82px}
}

/* ---------- 00 · hand assembly worked example ---------- */
.asm{border:1px solid var(--line);border-radius:3px;overflow:hidden;
  font-family:"IBM Plex Mono",monospace;font-size:.78rem}
.asmhead,.asmrow{display:grid;grid-template-columns:3.6rem 5.6rem 8.2rem minmax(0,1fr);
  gap:.6rem;align-items:baseline;padding:.5rem .85rem;border-bottom:1px solid var(--line)}
.asmhead{background:var(--void-3);color:var(--dim);font-size:.68rem;
  letter-spacing:.14em;text-transform:uppercase}
.asmrow{background:var(--void-2)}
.asmrow:last-child{border-bottom:0}
.asmrow .ad{color:var(--mag)}
.asmrow .by{color:var(--cyan)}
.asmrow .mn{color:var(--text-hi)}
.asmrow .cm{color:var(--dim);font-family:"IBM Plex Sans";font-size:.82rem}
.asmrow.hi{background:linear-gradient(90deg,rgba(255,46,136,.11),transparent 70%)}
@media(max-width:560px){
  .asmhead,.asmrow{grid-template-columns:3.4rem 5.2rem 1fr;row-gap:.15rem}
  .asmhead span:last-child,.asmrow .cm{grid-column:1/-1;padding-left:.1rem}
}
.asmnote{margin-top:.9rem;padding:.75rem .9rem;border:1px solid var(--line);
  border-left:2px solid var(--cyan);border-radius:3px;background:rgba(23,214,232,.04);
  font-family:"IBM Plex Mono",monospace;font-size:.74rem;color:var(--dim);line-height:1.75}
.asmnote b{color:var(--cyan);font-weight:500}
.asmcap{font-family:"IBM Plex Mono",monospace;font-size:.7rem;color:var(--dim);
  letter-spacing:.06em;margin-bottom:.7rem;line-height:1.6}

/* ---------- 00 · why the padding exists ---------- */
.shift{display:grid;gap:.9rem;grid-template-columns:1fr}
@media(min-width:600px){.shift{grid-template-columns:1fr 1fr}}
.shiftcol{border:1px solid var(--line);border-radius:3px;background:var(--void-2);padding:.9rem;
  display:flex;flex-direction:column}
.shiftcol h4{margin:0 0 .2rem;font-family:"IBM Plex Mono",monospace;font-size:.72rem;
  letter-spacing:.13em;text-transform:uppercase;color:var(--dim);font-weight:500}
.shiftcol .sub{font-size:.75rem;color:var(--mid);margin-bottom:.75rem;
  font-family:"IBM Plex Sans";line-height:1.5}
.srow{display:grid;grid-template-columns:3.6rem minmax(0,1fr) 1.4rem;gap:.5rem;align-items:center;
  font-family:"IBM Plex Mono",monospace;font-size:.75rem;padding:.34rem .45rem;
  border:1px solid var(--line);border-radius:2px;background:var(--void-3);margin-bottom:.32rem}
.srow .a{color:var(--mag)}
.srow .n{color:var(--text-hi)}
.srow .m{text-align:center;font-size:.8rem}
.srow.moved{border-color:rgba(255,46,136,.5)}
.srow.moved .a{color:var(--mag);font-weight:600}
.srow.moved .m{color:var(--mag)}
.srow.stays .m{color:var(--cyan)}
.srow.pad{background:transparent;border-style:dashed;color:var(--dim)}
.srow.pad .n{color:var(--dim)}
.shiftfoot{font-family:"IBM Plex Mono",monospace;font-size:.71rem;line-height:1.6;
  margin-top:auto;padding-top:.7rem;border-top:1px solid var(--line)}
.shiftfoot.bad{color:var(--mag)}
.shiftfoot.good{color:var(--cyan)}