:root{
  --bg:#060a05;
  --panel:#0b120a;
  --ink:#e8ffe7;
  --muted:#a6d4a3;
  --accent:#7cff7a;
  --accent2:#00e5ff;
}

html,body{height:100%}
body{
  margin:0;
  background:
    radial-gradient(900px 650px at 20% 15%, rgba(124,255,122,.15), transparent 55%),
    radial-gradient(850px 650px at 85% 85%, rgba(0,229,255,.10), transparent 55%),
    linear-gradient(180deg, var(--bg), #020402);
  color:var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  display:flex;
  align-items:center;
  justify-content:center;
}
.shell{width:min(980px, calc(100vw - 32px))}
.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:14px;
}
.topbar a{
  color:var(--accent);
  text-decoration:none;
  border:1px solid rgba(124,255,122,.30);
  padding:8px 10px;
  border-radius:12px;
  background:rgba(124,255,122,.06);
}
.topbar h1{margin:0; font-size:18px; letter-spacing:.08em; text-transform:uppercase}

.panel{
  display:grid;
  grid-template-columns: 1fr 260px;
  gap:16px;
}
@media (max-width: 900px){
  .panel{grid-template-columns: 1fr}
}
.card{
  border:1px solid rgba(255,255,255,.10);
  border-radius:18px;
  background:linear-gradient(180deg, rgba(11,18,10,.85), rgba(11,18,10,.60));
  padding:16px;
  box-shadow:0 24px 55px rgba(0,0,0,.45);
}
canvas{
  width:100%;
  height:auto;
  background:#030603;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.08);
}
.hud{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.hud strong{color:var(--ink)}
.hud .muted{color:var(--muted); font-size:13px; line-height:1.45}
.hud button{
  appearance:none;
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  color:var(--ink);
  padding:10px 12px;
  border-radius:12px;
  cursor:pointer;
}
.hud button:hover{border-color:rgba(124,255,122,.30)}
.kbd{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  border:1px solid rgba(255,255,255,.12);
  padding:2px 6px;
  border-radius:8px;
  background:rgba(0,0,0,.25);
}