:root{
  --bg:#0f1419; --panel:#1a2230; --panel2:#222d3d; --line:#2c3a4f;
  --txt:#e6edf3; --muted:#8b9bb0; --accent:#3b82f6; --accent2:#2563eb;
  --good:#22c55e; --bad:#ef4444; --warn:#f59e0b;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg); color:var(--txt); -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer}
.app{max-width:1100px;margin:0 auto;padding:18px;min-height:100%}
header.top{display:flex;align-items:center;gap:14px;margin-bottom:18px}
header.top h1{font-size:22px;margin:0;letter-spacing:.5px}
header.top .sub{color:var(--muted);font-size:13px}
.logo{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px;color:#fff;flex-shrink:0}
.nav{display:flex;gap:8px}
.spacer{flex:1}
.btn{background:var(--panel2);color:var(--txt);border:1px solid var(--line);border-radius:9px;
  padding:9px 14px;font-size:14px;transition:.12s}
.btn:hover{border-color:var(--accent);background:#2a3850}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.btn.primary:hover{background:var(--accent2)}
.btn.good{background:var(--good);border-color:var(--good);color:#04210f;font-weight:700}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.lg{padding:14px 26px;font-size:17px}

/* Home grid */
.modes{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;
  transition:.15s;cursor:pointer;position:relative;overflow:hidden}
.card:hover{border-color:var(--accent);transform:translateY(-2px)}
.card .ico{font-size:30px;margin-bottom:8px}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0;color:var(--muted);font-size:13px;line-height:1.45}
.card .rec{margin-top:10px;font-size:12px;color:var(--warn)}

.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:16px}
.row{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}
.config{flex:0 0 270px;display:flex;flex-direction:column;gap:12px}
.stage{flex:1;min-width:280px;min-height:340px;background:#0b0f16;border:1px solid var(--line);
  border-radius:12px;display:flex;align-items:center;justify-content:center;padding:20px;position:relative;
  overflow:hidden}
label.f{display:flex;flex-direction:column;gap:5px;font-size:13px;color:var(--muted)}
label.f input[type=number],label.f input[type=text],label.f select{
  background:var(--panel2);border:1px solid var(--line);border-radius:8px;color:var(--txt);
  padding:8px 10px;font-size:16px;width:100%}
.chk{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--txt)}
.chk input{width:16px;height:16px;accent-color:var(--accent)}
.grp{display:flex;gap:10px}
.grp label.f{flex:1}
h2.sec{font-size:18px;margin:2px 0 14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.pill{font-size:12px;background:var(--panel2);border:1px solid var(--line);border-radius:20px;padding:3px 10px;color:var(--muted)}

/* digit display */
.digits{font-variant-numeric:tabular-nums;letter-spacing:.12em;line-height:1.8;text-align:center;
  font-weight:600;color:#fff;max-width:100%}
.digit-grid{display:inline-grid;gap:6px 10px;justify-content:center;max-width:100%}
.dcell{min-width:1.1em;text-align:center}
.recall-wrap{max-width:100%;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch}
.recall-grid{display:inline-grid;gap:6px 8px}
.recall-grid input{width:1.5em;text-align:center;background:var(--panel2);border:1px solid var(--line);
  border-radius:6px;color:var(--txt);padding:6px 0;font-size:18px;font-variant-numeric:tabular-nums}
.recall-grid input.ok{border-color:var(--good);color:var(--good)}
.recall-grid input.err{border-color:var(--bad);color:var(--bad);background:#2a1416}
.big-count{font-size:90px;font-weight:800;color:var(--accent)}
.center-msg{text-align:center;color:var(--muted)}
.timer{position:absolute;top:10px;right:14px;font-size:14px;color:var(--warn);font-variant-numeric:tabular-nums}
textarea.fast{width:100%;min-height:90px;background:var(--panel2);border:1px solid var(--line);
  border-radius:8px;color:var(--txt);padding:10px;font-size:18px;letter-spacing:.1em;font-family:inherit}
.seq-answer{letter-spacing:.1em;word-break:break-all}

/* shapes */
.shape-stage svg{filter:drop-shadow(0 4px 12px rgba(0,0,0,.5))}
.palette{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.swatch{width:30px;height:30px;border-radius:6px;border:2px solid transparent;cursor:pointer}
.swatch.sel{border-color:#fff}
.shape-pick{display:flex;gap:6px;flex-wrap:wrap}
.shape-pick button{width:42px;height:42px;border-radius:8px;background:var(--panel2);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;padding:0}
.shape-pick button.sel{border-color:var(--accent);background:#2a3850}
.recall-shapes{display:grid;grid-template-columns:repeat(auto-fill,minmax(64px,1fr));gap:10px;width:100%}
.rs-slot{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:8px;text-align:center;cursor:pointer}
.rs-slot.err{border-color:var(--bad)}
.rs-slot.ok{border-color:var(--good)}
.rs-slot .idx{font-size:11px;color:var(--muted)}

/* matrices */
.matrix{display:inline-grid;gap:3px;background:#0b0f16}
.mcell{background:#fff;border-radius:3px}
.mcell.on{background:var(--accent)}
.mcell.clk{cursor:pointer}
.mcell.ok{outline:2px solid var(--good)}
.mcell.err{outline:2px solid var(--bad)}
.matrix-wrap{display:flex;gap:24px;flex-wrap:wrap;align-items:flex-start;justify-content:center}
.mlabel{text-align:center;font-size:12px;color:var(--muted);margin-bottom:6px}

.result{margin-top:14px;padding:14px;border-radius:10px;background:var(--panel2);border:1px solid var(--line)}
.result .score{font-size:30px;font-weight:800}
.result.win{border-color:var(--good)}
.result .line{color:var(--muted);font-size:14px;margin-top:4px;overflow-wrap:anywhere}
.hidden{display:none!important}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.rec{width:100%;border-collapse:collapse;font-size:14px}
table.rec th,table.rec td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
table.rec th{color:var(--muted);font-weight:600;font-size:12px}
.muted{color:var(--muted)}
.back{display:inline-flex;align-items:center;gap:6px}
a{color:var(--accent)}
.footer{color:var(--muted);font-size:12px;text-align:center;margin-top:24px;line-height:1.6}
.test-progress{position:absolute;top:10px;left:14px;font-size:13px;color:var(--muted)}

/* ============================================================
 *  Mobile
 * ============================================================ */
@media (max-width:720px){
  .app{padding:12px}
  header.top{flex-wrap:wrap;gap:10px;margin-bottom:14px}
  header.top h1{font-size:18px}
  header.top .sub{font-size:11px}
  .nav{width:100%;order:3}
  .nav .btn{flex:1}
  .spacer{display:none}

  .panel{padding:14px}
  .modes{grid-template-columns:1fr 1fr;gap:10px}
  .card{padding:14px}
  .card .ico{font-size:24px}
  .card h3{font-size:15px}
  .card p{font-size:12px}

  /* config on top, stage below, both full width */
  .row{flex-direction:column;gap:14px}
  .config{flex:1 1 auto;width:100%}
  .stage{width:100%;min-width:0;min-height:260px;padding:12px}

  .btn.lg{padding:12px 18px;font-size:16px;width:100%}
  .toolbar .btn{flex:1 1 auto}

  .big-count{font-size:64px}
  .recall-grid{gap:5px 5px}
  .recall-grid input{font-size:16px;width:1.6em;padding:8px 0}
  .recall-shapes{grid-template-columns:repeat(auto-fill,minmax(56px,1fr));gap:8px}
  .matrix-wrap{gap:14px}
  table.rec{font-size:13px}
  table.rec th,table.rec td{padding:6px 8px}
}

@media (max-width:400px){
  .modes{grid-template-columns:1fr}
}