:root{
  --lcd0:#9bbc0f; --lcd1:#8bac0f; --lcd2:#306230; --lcd3:#0f380f;
  --plastic:#c9c4c1; --plastic-dark:#a8a29e;
  --accent:#8a1846; --accent2:#b6265f;
  --dark:#14100f;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{
  font-family:'JetBrains Mono',monospace;
  background:radial-gradient(circle at 50% 0%, #2a2320 0%, #14100f 55%, #080606 100%);
  color:#d8d2cc;
  min-height:100vh;
  padding:16px 12px 40px;
  overflow-x:hidden;
}
#ambient{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(circle at 50% 42%, rgba(155,188,15,0.08), transparent 45%);
}
header{text-align:center;margin-bottom:18px;}
header h1{
  font-family:'Press Start 2P',monospace;
  font-size:clamp(18px,5vw,34px);
  margin:0;color:var(--lcd0);
  text-shadow:0 0 18px rgba(155,188,15,0.45), 3px 3px 0 #0f380f;
  letter-spacing:1px;
}
.subtitle{
  font-size:12px;color:#9a938c;margin:8px 0 0;letter-spacing:.5px;
}

/* dropzone */
.dropzone{
  max-width:520px;margin:0 auto 20px;
  border:2px dashed #5a5450;border-radius:14px;
  background:rgba(255,255,255,0.02);
  transition:.2s;cursor:pointer;
}
.dropzone.drag-over{border-color:var(--lcd0);background:rgba(155,188,15,0.08);transform:scale(1.01);}
.dropzone.loaded{border-style:solid;border-color:var(--lcd2);}
.dz-inner{display:flex;flex-direction:column;align-items:center;gap:8px;padding:22px 18px;text-align:center;}
.dz-icon{font-size:26px;}
.dropzone strong{font-size:14px;color:#eae4de;}
.dz-sub{font-size:11px;color:#8a837d;font-style:italic;}
.insert-btn{
  margin-top:6px;background:var(--accent);color:#fff;border:none;
  padding:10px 20px;border-radius:8px;font-family:'Press Start 2P',monospace;
  font-size:10px;cursor:pointer;box-shadow:0 4px 0 #5c0e2f;transition:.1s;
}
.insert-btn:active{transform:translateY(3px);box-shadow:0 1px 0 #5c0e2f;}

/* gameboy body */
.gameboy{
  max-width:420px;margin:0 auto;
  background:linear-gradient(160deg,var(--plastic),var(--plastic-dark));
  border-radius:16px 16px 60px 16px;
  padding:22px 24px 30px;
  box-shadow:0 20px 50px rgba(0,0,0,.6), inset 0 2px 0 rgba(255,255,255,.4), inset 0 -6px 14px rgba(0,0,0,.2);
}
.screen-bezel{
  background:#4a4a52;border-radius:10px 10px 34px 10px;
  padding:16px 22px 20px;box-shadow:inset 0 2px 8px rgba(0,0,0,.6);
}
.screen-label-top{
  color:#8a8a95;font-size:9px;letter-spacing:2px;text-align:center;margin-bottom:8px;
}
.screen-frame{background:#0b0b0b;border-radius:6px;padding:12px;}
.power-row{display:flex;align-items:center;gap:6px;margin-bottom:6px;}
.led{width:8px;height:8px;border-radius:50%;background:#3a0000;box-shadow:inset 0 0 2px #000;}
.led.on{background:#ff3b30;box-shadow:0 0 8px #ff3b30;}
.power-text{color:#7a1620;font-size:8px;letter-spacing:1px;}
#canvas{
  display:block;margin:0 auto;image-rendering:pixelated;image-rendering:crisp-edges;
  background:var(--lcd0);border-radius:2px;
}
.brand{
  text-align:center;margin-top:12px;
  font-family:'Press Start 2P',monospace;font-size:14px;color:#1e2a5a;
}
.brand-sub{color:var(--accent);font-size:9px;}

/* controls */
.gb-controls{display:flex;justify-content:space-between;align-items:center;margin-top:26px;padding:0 6px;}
.dpad{position:relative;width:96px;height:96px;}
.dbtn{
  position:absolute;background:#2a2a2e;color:#777;border:none;
  width:32px;height:32px;font-size:12px;cursor:pointer;
  box-shadow:0 3px 0 #101012;transition:.05s;
}
.dbtn.up{top:0;left:32px;border-radius:5px 5px 0 0;}
.dbtn.down{bottom:0;left:32px;border-radius:0 0 5px 5px;}
.dbtn.left{top:32px;left:0;border-radius:5px 0 0 5px;}
.dbtn.right{top:32px;right:0;border-radius:0 5px 5px 0;}
.dcenter{position:absolute;top:32px;left:32px;width:32px;height:32px;background:#2a2a2e;}
.dbtn.pressed{background:#1a1a1c;transform:translateY(2px);box-shadow:0 1px 0 #101012;}
.ab{display:flex;gap:14px;transform:rotate(-20deg);}
.round{
  width:50px;height:50px;border-radius:50%;border:none;
  background:linear-gradient(160deg,var(--accent2),var(--accent));
  color:#fff;font-family:'Press Start 2P',monospace;font-size:12px;cursor:pointer;
  box-shadow:0 4px 0 #5c0e2f;transition:.05s;
}
.round.pressed{transform:translateY(3px);box-shadow:0 1px 0 #5c0e2f;}
.startsel{display:flex;justify-content:center;gap:26px;margin-top:22px;}
.pill{
  background:#3a3a40;color:#c9c4c1;border:none;
  padding:7px 16px;border-radius:20px;font-size:8px;letter-spacing:1px;
  transform:rotate(-20deg);cursor:pointer;box-shadow:0 3px 0 #1a1a1e;transition:.05s;
}
.pill.pressed{transform:rotate(-20deg) translateY(2px);box-shadow:0 1px 0 #1a1a1e;}

/* control bar */
.control-bar{
  max-width:520px;margin:24px auto 0;display:flex;flex-wrap:wrap;
  gap:10px;justify-content:center;align-items:center;
}
.control-bar button{
  background:#26221f;color:var(--lcd0);border:1px solid #3d3833;
  padding:9px 14px;border-radius:6px;font-family:'JetBrains Mono',monospace;
  font-size:12px;cursor:pointer;transition:.15s;
}
.control-bar button:hover{background:#332e29;border-color:var(--lcd0);}
.sel{font-size:11px;color:#9a938c;display:flex;align-items:center;gap:6px;}
.sel select{
  background:#26221f;color:#d8d2cc;border:1px solid #3d3833;
  padding:6px 8px;border-radius:5px;font-family:inherit;font-size:11px;
}

/* debug */
.debug{
  max-width:720px;margin:20px auto 0;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;
  background:#0c0a09;border:1px solid #2a2622;border-radius:10px;padding:14px;
}
.debug.hidden{display:none;}
.dbg-col h3{margin:0 0 8px;font-size:10px;color:var(--lcd1);letter-spacing:1px;}
.dbg-col pre{margin:0;font-size:11px;line-height:1.5;color:#88c020;white-space:pre-wrap;}

/* SM83 test harness modal */
.test-modal{
  position:fixed;inset:0;z-index:100;display:none;
  align-items:center;justify-content:center;
  background:rgba(4,3,2,.82);backdrop-filter:blur(3px);padding:16px;
}
.test-modal.open{display:flex;}
.test-box{
  background:#0c0a09;border:1px solid #2a2622;border-radius:12px;
  width:min(760px,100%);max-height:88vh;display:flex;flex-direction:column;
  box-shadow:0 24px 60px rgba(0,0,0,.7);overflow:hidden;
}
.test-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;border-bottom:1px solid #2a2622;
}
.test-head h3{margin:0;font-family:'Press Start 2P',monospace;font-size:12px;color:var(--lcd0);}
.test-x{background:none;border:none;color:#8a837d;font-size:16px;cursor:pointer;}
.test-x:hover{color:var(--accent2);}
.test-sub{margin:12px 16px 0;font-size:11px;color:#8a837d;line-height:1.6;}
.test-sub code{color:var(--lcd1);background:#161311;padding:1px 5px;border-radius:3px;font-size:10px;}
.test-controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:12px 16px;}
.test-controls button{
  background:#26221f;color:var(--lcd0);border:1px solid #3d3833;
  padding:8px 14px;border-radius:6px;font-family:inherit;font-size:12px;cursor:pointer;
}
.test-controls button:hover{background:#332e29;border-color:var(--lcd0);}
#testRun{background:var(--accent);color:#fff;border-color:var(--accent);}
#testRun:hover{background:var(--accent2);border-color:var(--accent2);}
.test-barwrap{height:6px;background:#161311;margin:0 16px;border-radius:3px;overflow:hidden;}
.test-bar{height:100%;width:0;background:linear-gradient(90deg,var(--lcd2),var(--lcd0));transition:width .15s;}
.test-stat{padding:8px 16px 0;font-size:11px;color:#9a938c;letter-spacing:.5px;}
.test-log{
  margin:8px 16px 16px;padding:10px;background:#08120a;border:1px solid #1c2a1c;
  border-radius:6px;font-size:11px;line-height:1.55;color:#88c020;
  overflow-y:auto;flex:1;min-height:180px;white-space:pre-wrap;
}
.test-log .hd{color:var(--lcd0);font-weight:700;}
.test-log .pass{color:#7ad636;}
.test-log .fail{color:#e0556a;}
.test-log .warn{color:#e0b23a;}

footer{
  text-align:center;margin-top:36px;font-size:11px;color:#6a635d;
}
footer a{color:var(--lcd0);text-decoration:none;margin-left:10px;border-bottom:1px dotted var(--lcd0);}
footer a:hover{color:#c0e030;}

@media (max-width:480px){
  .round{width:44px;height:44px;font-size:11px;}
  .gameboy{padding:18px 16px 26px;}
  .screen-bezel{padding:12px 14px 16px;}
}