:root{
  --bg:#f6f1e7;--bg2:#efe7d7;--ink:#2b2620;--mut:#94897a;--card:#fffdf9;--line:#e6ddcd;
  --ok:#3a8d4f;--ok-ink:#256436;--bad:#c0392b;--accent:#a96a2c;--accent-ink:#8a531d;--hl:#e8b04b;
  --slot:#efe7d7;--slot-line:#dcd0bb;--peg-ink:#fff;
  /* eight code colors — number is always shown too, so color-blind safe */
  --c1:#d64545;--c2:#e08a2b;--c3:#e6c12e;--c4:#3f9d52;
  --c5:#2ba8a8;--c6:#3b7ddd;--c7:#8a5fd6;--c8:#d85fa6;
}
@media(prefers-color-scheme:dark){:root{
  --bg:#17140f;--bg2:#1e1a13;--ink:#efe9df;--mut:#8c8275;--card:#241f17;--line:#3a3326;
  --ok:#62c47d;--ok-ink:#8ad8a0;--bad:#e07a6c;--accent:#d9a066;--accent-ink:#e8b87f;--hl:#caa23d;
  --slot:#1e1a13;--slot-line:#3a3326;
  --c1:#e06464;--c2:#e8a04f;--c3:#e6cf52;--c4:#5cc173;
  --c5:#48c4c4;--c6:#5f9bef;--c7:#a684e6;--c8:#e87fbb;
}}
*{box-sizing:border-box}
html,body{margin:0}
body{font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;color:var(--ink);
  background:radial-gradient(120% 80% at 50% -10%,var(--bg2),var(--bg));min-height:100vh;
  display:flex;justify-content:center;padding:20px 16px 140px;-webkit-tap-highlight-color:transparent}
.wrap{width:100%;max-width:560px}

header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:4px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
h1{font-size:clamp(20px,5vw,26px);margin:0;letter-spacing:-.01em}
h1 a{color:var(--ink);text-decoration:none}
.tools{display:flex;align-items:center;gap:8px}
.toolbtn{background:var(--card);border:1px solid var(--line);color:var(--accent-ink);border-radius:999px;
  padding:7px 13px;font-size:13px;font-weight:600;cursor:pointer;white-space:nowrap}
.toolbtn:hover{border-color:var(--accent)}
.toolbtn[aria-pressed=true]{background:var(--accent);color:#fff;border-color:var(--accent)}
.gc{font:700 13px/1 ui-monospace,monospace;color:#fff;background:var(--accent);text-decoration:none;
  border-radius:999px;padding:7px 12px}
.sub{color:var(--mut);font-size:14.5px;margin:12px 2px 16px}
.sub b{color:var(--ink)}

/* ---- board ---- */
.board{display:flex;flex-direction:column;gap:8px;margin:6px 0 4px}
.row{display:grid;grid-template-columns:24px repeat(4,1fr) 108px;align-items:center;gap:8px;
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:8px 10px;
  opacity:.5;transition:opacity .2s,box-shadow .2s}
.row.done{opacity:1}
.row.active{opacity:1;box-shadow:inset 0 0 0 2px var(--hl);border-color:var(--hl)}
.rnum{font:700 12px/1 ui-monospace,monospace;color:var(--mut);text-align:center}

.slot{aspect-ratio:1/1;width:100%;max-width:46px;margin:0 auto;border-radius:50%;
  background:var(--slot);border:2px dashed var(--slot-line);display:flex;align-items:center;justify-content:center;
  font:800 18px/1 ui-monospace,monospace;color:var(--peg-ink);cursor:default;transition:transform .12s,border-color .15s}
.row.active .slot{cursor:pointer}
.row.active .slot:empty:hover{border-color:var(--accent)}
.slot.filled{border-style:solid;border-color:rgba(0,0,0,.12)}
.peg-1{background:var(--c1)}.peg-2{background:var(--c2)}.peg-3{background:var(--c3)}.peg-4{background:var(--c4)}
.peg-5{background:var(--c5)}.peg-6{background:var(--c6)}.peg-7{background:var(--c7)}.peg-8{background:var(--c8)}
.peg-3,.peg-3.ph{color:#3a2e00}
.slot.pop{animation:pop .18s ease}
@keyframes pop{0%{transform:scale(.6)}60%{transform:scale(1.12)}100%{transform:scale(1)}}
/* easy-mode per-peg ring */
.slot.exact{box-shadow:0 0 0 3px var(--ok)}
.slot.present{box-shadow:0 0 0 3px var(--c6)}

/* ---- feedback score (counts, not a per-peg grid) ---- */
.keys{display:flex;flex-direction:column;gap:5px;justify-content:center;align-items:flex-start}
.kc{display:flex;align-items:center;gap:5px;white-space:nowrap}
.kdot{width:13px;height:13px;border-radius:50%;flex:none;border:1.5px solid var(--ink)}
.kdot.black{background:var(--ink);border-color:var(--ink)}
.kdot.white{background:var(--card);border-color:var(--ink)}
.kn{font:800 14px/1 ui-monospace,monospace;color:var(--ink);min-width:.8em;text-align:right}
.klab{font:600 10.5px/1 system-ui;color:var(--mut)}

/* ---- palette ---- */
.palette{position:fixed;left:0;right:0;bottom:0;background:var(--card);border-top:1px solid var(--line);
  padding:12px 14px calc(12px + env(safe-area-inset-bottom));box-shadow:0 -4px 18px rgba(0,0,0,.06);z-index:5}
.palette-in{max-width:560px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.pegs{display:grid;grid-template-columns:repeat(8,1fr);gap:8px}
.pick{aspect-ratio:1/1;width:100%;border:0;border-radius:50%;cursor:pointer;font:800 18px/1 ui-monospace,monospace;
  color:var(--peg-ink);box-shadow:0 1px 3px rgba(0,0,0,.18);transition:transform .1s}
.pick:active{transform:scale(.9)}
.actions{display:flex;gap:8px}
.actions button{flex:1;border:0;border-radius:12px;padding:13px;font:700 15px system-ui;cursor:pointer}
#undo{background:var(--bg2);color:var(--ink);border:1px solid var(--line)}
#check{background:var(--accent);color:#fff}
#check:disabled{opacity:.4;cursor:default}
#undo:disabled{opacity:.4;cursor:default}

/* ---- end card ---- */
.end{display:none;text-align:center;background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:22px 18px;margin-top:18px}
.end.show{display:block}
.end h2{margin:.1em 0;font-size:23px;color:var(--ok-ink)}
.end.lose h2{color:var(--bad)}
.end .esub{color:var(--mut);font-size:14px;margin:6px 0 0}
.solrow{display:flex;gap:8px;justify-content:center;margin:6px 0 2px}
.solrow .slot{cursor:default}
.codelabel{font:600 11px/1 system-ui;text-transform:uppercase;letter-spacing:.1em;color:var(--mut);margin-top:16px}
.kw{margin:16px 0 6px}
.kw .label{font:600 11px/1 system-ui;text-transform:uppercase;letter-spacing:.1em;color:var(--mut)}
.kw .val{font:800 clamp(22px,7vw,30px)/1.2 ui-monospace,monospace;letter-spacing:.02em;color:var(--accent-ink);
  margin-top:6px;user-select:all}
.row2{display:flex;gap:10px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.ghost{background:transparent;color:var(--accent-ink);border:1px solid var(--line);border-radius:11px;
  padding:10px 16px;font-weight:600;cursor:pointer}

/* ---- rules modal ---- */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:none;align-items:center;justify-content:center;
  padding:18px;z-index:20}
.modal.show{display:flex}
.sheet{background:var(--card);border:1px solid var(--line);border-radius:18px;max-width:440px;width:100%;
  padding:22px;max-height:85vh;overflow:auto}
.sheet h2{margin:0 0 10px;font-size:20px}
.sheet p{font-size:14.5px;color:var(--ink);margin:0 0 10px}
.sheet .legend{display:flex;align-items:center;gap:8px;font-size:14px;margin:6px 0}
.sheet .dot{width:14px;height:14px;border-radius:50%;flex:none}
.sheet .dot.black{background:var(--ink)}
.sheet .dot.white{background:var(--card);border:1.5px solid var(--ink)}
.sheet .close{margin-top:8px;width:100%;border:0;border-radius:12px;padding:12px;background:var(--accent);
  color:#fff;font-weight:700;cursor:pointer}

@media(max-width:430px){
  .row{grid-template-columns:18px repeat(4,1fr) 92px;gap:6px;padding:7px 8px}
  .kn{font-size:13px}
  .klab{font-size:10px}
  .gc{display:none}
  .pegs{gap:6px}
}