:root {
  --bg: #10131a;
  --panel: #181d28;
  --line: #2a3142;
  --ink: #e6ebf5;
  --dim: #8a94a8;
  --accent: #5fd0c5;
  --hot: #f0785a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
  background: radial-gradient(1200px 800px at 70% -10%, #1a2233, var(--bg));
  color: var(--ink);
}
header { padding: 18px 24px 4px; }
h1 { margin: 0; letter-spacing: 0.4em; font-weight: 800; font-size: 22px; }
.tag { margin: 2px 0 0; color: var(--dim); font-size: 13px; font-style: italic; }
main {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-areas: "brief board" "brief controls";
  gap: 16px;
  padding: 16px 24px 32px;
  align-items: start;
}
#brief { grid-area: brief; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
#brief h2 { margin: 0 0 6px; font-size: 14px; text-transform: uppercase; letter-spacing: 0.15em; color: var(--accent); }
.briefline { color: var(--dim); font-size: 12px; line-height: 1.5; }
.io { display: flex; gap: 12px; margin-top: 14px; }
.io-col { flex: 1; }
.io-label { font-size: 11px; color: var(--dim); letter-spacing: 0.2em; }
.atom-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; min-height: 40px; }
canvas#board { grid-area: board; background: #0c0f16; border: 1px solid var(--line); border-radius: 12px; width: 100%; height: auto; }
#controls { grid-area: controls; }
.toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
button {
  background: #222a39; color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 12px; font-size: 14px; cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.danger:hover { border-color: var(--hot); }
.status { margin-left: auto; color: var(--dim); font-variant-numeric: tabular-nums; font-size: 13px; }
.tape { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.tape-label { font-size: 11px; color: var(--dim); letter-spacing: 0.2em; }
.tape-cells { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; min-height: 36px; }
.tape-cells .cell {
  width: 34px; height: 34px; display: grid; place-items: center;
  background: #0e1219; border: 1px solid var(--line); border-radius: 6px; font-size: 16px;
}
.tape-cells .cell.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(95,208,197,0.25); }
.palette { display: flex; gap: 6px; }
.palette button { width: 40px; }
.lib-h { margin: 18px 0 6px !important; }
.lib { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }
.chip {
  display: flex; align-items: center; gap: 8px;
  background: #0e1219; border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 9px; font-size: 12px; color: var(--dim);
}
.chip .dot { width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(0,0,0,.35); flex: none; }
.chip .arrow { color: var(--dim); }
.chip .name { margin-left: auto; color: var(--accent); font-weight: 600; letter-spacing: .05em; }
.chip.fresh { border-color: var(--accent); animation: pop .5s ease; }
.chip.pick { cursor: pointer; }
.chip.pick:hover { border-color: var(--accent); }
.chip.active { border-color: var(--accent); background: #10161f; }
.reagent-row { display: flex; flex-wrap: wrap; gap: 6px; }
.reagent {
  display: flex; align-items: center; gap: 6px;
  background: #0e1219; border: 1px solid var(--line); border-radius: 20px;
  padding: 4px 10px 4px 4px; font-size: 12px; color: var(--ink);
}
.reagent.final { border-color: #e8c34a; box-shadow: 0 0 12px rgba(232,195,74,.25); }
@keyframes pop { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }