:root {
  --bg:#f5f0e8; --paper:#fdfaf4; --ink:#1a1208; --line:#c8b89a;
  --box:#6b4f2a; --user:#3a5fa0; --error:#c0392b; --ok:#27ae60;
  --hi:#e8dfc8; --shadow:rgba(100,70,20,.15); --accent:#8b5e2a;
}
*{margin:0;padding:0;box-sizing:border-box}
body{
  background:var(--bg);
  background-image:radial-gradient(ellipse at 20% 20%,#e8d9be,transparent 60%),
                   radial-gradient(ellipse at 80% 80%,#d4c5a0,transparent 55%);
  min-height:100vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;padding:2rem;
  font-family:'DM Mono',monospace;
}
header{text-align:center;margin-bottom:1.5rem;animation:fadeDown .6s ease both}
header h1{font-family:'Playfair Display',serif;font-size:clamp(2rem,5vw,3rem);
  color:var(--ink);letter-spacing:-1px}
header p{color:var(--accent);font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;margin-top:.4rem}

.card{background:var(--paper);border-radius:16px;padding:1.75rem 2.25rem 2.25rem;
  box-shadow:0 2px 4px var(--shadow),0 8px 24px var(--shadow),0 0 0 1px rgba(100,70,20,.08);
  animation:fadeUp .7s ease .1s both;width:min(430px,95vw)}

.diff-row{display:flex;align-items:center;gap:.5rem;justify-content:center;margin-bottom:1.25rem}
.diff-row label{font-size:.7rem;letter-spacing:.15em;text-transform:uppercase;color:var(--accent)}
#diff-label{font-size:.78rem;color:var(--ink);font-weight:500;letter-spacing:.05em}

/* ── GRID ── */
#grid{display:grid;grid-template-columns:repeat(6,1fr);grid-template-rows:repeat(6,1fr);
  border:2.5px solid var(--box);border-radius:6px;overflow:hidden;
  width:min(340px,82vw);height:min(340px,82vw);margin:0 auto}
.cell{position:relative;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);background:var(--paper);cursor:pointer;transition:background .15s}
.cell:hover:not(.given){background:var(--hi)}
.cell.active{background:#dff0ff}
.cell.hilite{background:#f0ede5}
.cell[data-col="2"]{border-right:2.5px solid var(--box)}
.cell[data-row="1"]{border-bottom:2.5px solid var(--box)}
.cell[data-row="3"]{border-bottom:2.5px solid var(--box)}
.cell input{position:absolute;inset:0;width:100%;height:100%;border:none;
  background:transparent;text-align:center;font-family:'DM Mono',monospace;
  font-size:clamp(1.2rem,4.5vw,1.7rem);font-weight:700;color:var(--user);
  cursor:pointer;outline:none;caret-color:transparent}
.cell.given span{font-family:'DM Mono',monospace;font-size:clamp(1.2rem,4.5vw,1.7rem);font-weight:700;color:var(--ink)}
.cell.error{background:#fde8e8}.cell.error input{color:#c0150b}
.cell.correct input{color:#2ecc71}

/* ── SEARCH STATUS INLINE ── */
.inline-status{text-align:center;min-height:unset;
  font-size:.75rem;color:var(--accent);letter-spacing:.07em}

/* ── ACTIONS ── */
.actions{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center;margin-top:1.25rem}
.btn{padding:.55rem 1.4rem;border-radius:8px;border:1.5px solid var(--box);
  font-family:'DM Mono',monospace;font-size:.75rem;font-weight:500;
  letter-spacing:.05em;cursor:pointer;transition:all .15s}
.btn-primary{background:var(--box);color:#fdfaf4}
.btn-primary:hover{background:#7a4520;transform:translateY(-1px)}
.btn-secondary{background:transparent;color:var(--accent)}
.btn-secondary:hover{background:var(--hi)}

#message{text-align:center;margin-top:1rem;min-height:1.5rem;
  font-size:.8rem;font-weight:500;letter-spacing:.05em}
.msg-error{color:var(--error)}.msg-ok{color:var(--ok)}

/* ── CODE ROW ── */
.code-row{display:flex;flex-direction:column;gap:.45rem;margin-top:1.1rem;
  padding:.7rem .9rem;background:var(--hi);border-radius:10px;
  border:1px solid var(--line)}
.code-line1{display:flex;align-items:center;gap:.45rem;padding:0 .5rem}
.code-line2{display:flex;gap:.45rem;justify-content:center}
.code-lbl{font-size:.6rem;color:var(--accent);letter-spacing:.14em;
  text-transform:uppercase;white-space:nowrap;margin-right:.1rem}
#code-input{flex:1;min-width:0;border:1px solid var(--line);border-radius:6px;
  background:var(--paper);font-family:'DM Mono',monospace;font-size:.7rem;
  color:var(--ink);padding:.32rem .45rem;outline:none;letter-spacing:.04em;
  transition:border-color .15s}
#code-input:focus{border-color:var(--accent)}
#code-input.invalid{border-color:var(--error);color:var(--error)}
.code-btn{flex-shrink:0;padding:.32rem .6rem;border-radius:6px;
  border:1.5px solid var(--line);background:var(--paper);
  font-family:'DM Mono',monospace;font-size:.68rem;font-weight:500;
  color:var(--accent);cursor:pointer;transition:all .15s}
.code-btn:hover{background:var(--paper);border-color:var(--accent);
  transform:translateY(-1px)}
.code-btn.copied{border-color:var(--ok);color:var(--ok)}

/* ── METRICS PANEL ── */
.metrics-panel{overflow:hidden;max-height:0;opacity:0;
  transition:max-height .45s ease,opacity .35s ease;margin-top:0}
.metrics-panel.visible{max-height:420px;opacity:1;margin-top:1.5rem}

.mp-divider{border:none;border-top:1px solid var(--line);margin-bottom:1.25rem}

.score-row{display:flex;align-items:baseline;justify-content:center;gap:.7rem;margin-bottom:1.1rem}
.score-num{font-family:'Playfair Display',serif;font-size:2.4rem;color:var(--ink);line-height:1;
  transition:color .4s}
.score-badge{font-size:.7rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;
  padding:.22rem .7rem;border-radius:20px;transition:all .4s;border:1.5px solid}

.metrics-rows{display:flex;flex-direction:column;gap:.55rem;margin-bottom:.9rem}
.mrow{display:grid;grid-template-columns:130px 1fr 58px 50px;align-items:center;gap:.45rem}
.mname{font-size:.68rem;color:var(--accent);letter-spacing:.04em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar-wrap{background:var(--hi);border-radius:4px;height:9px;overflow:hidden;
  border:1px solid var(--line)}
.bar{height:100%;border-radius:4px;width:0;transition:width .55s ease}
.mval{text-align:right;color:var(--ink);font-weight:500;font-size:.72rem}
.mpts{text-align:right;color:var(--accent);font-size:.63rem}

.status-row{display:flex;align-items:center;justify-content:center;gap:.6rem;min-height:1.6rem;margin-top:1.25rem}
.status-row .inline-status{margin-top:0}
.btn-stop{padding:.35rem .9rem;border-radius:6px;border:1px solid var(--box);
  background:transparent;color:var(--box);font-family:'DM Mono',monospace;
  font-size:.72rem;font-weight:500;letter-spacing:.06em;cursor:pointer;transition:all .15s}
.btn-stop:hover{background:var(--box);color:#fdfaf4}
.search-status{text-align:center;font-size:.71rem;color:var(--accent);
  letter-spacing:.08em;min-height:1.2em}
.blink{animation:blink 1s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.2}}

/* ── MODAL ── */
.modal-overlay{position:fixed;inset:0;background:rgba(26,18,8,.45);
  backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;
  z-index:20;opacity:0;pointer-events:none;transition:opacity .25s}
.modal-overlay.visible{opacity:1;pointer-events:all}
.modal{background:var(--paper);border-radius:16px;padding:2rem 2.5rem;text-align:center;
  box-shadow:0 16px 48px rgba(0,0,0,.2);transform:translateY(12px) scale(.97);
  transition:transform .25s;max-width:340px;width:90%}
.modal-overlay.visible .modal{transform:translateY(0) scale(1)}
.modal h2{font-family:'Playfair Display',serif;font-size:1.5rem;color:var(--ink);margin-bottom:.4rem}
.modal-sub{font-size:.73rem;color:var(--accent);letter-spacing:.1em;
  text-transform:uppercase;margin-bottom:1.4rem}
.modal-levels{display:flex;flex-direction:column;gap:.55rem;margin-bottom:1.25rem}
.lvl-btn{display:flex;align-items:center;justify-content:space-between;
  padding:.72rem 1.1rem;border-radius:10px;border:1.5px solid var(--line);
  background:transparent;cursor:pointer;font-family:'DM Mono',monospace;
  transition:all .15s;color:var(--ink)}
.lvl-btn:hover{background:var(--hi);border-color:var(--accent)}
.lvl-btn.active{background:var(--box);border-color:var(--box);color:#fdfaf4}
.lvl-btn .lname{font-size:.85rem;font-weight:500}
.lvl-btn .ldesc{font-size:.68rem;opacity:.65}
.lvl-dots{display:flex;gap:3px}
.dot{width:8px;height:8px;border-radius:50%;background:currentColor;opacity:.22}
.dot.on{opacity:1}

/* Máxima expand */
.max-expand{max-height:0;overflow:hidden;transition:max-height .35s ease}
.max-expand.open{max-height:220px}
.intensity-block{background:var(--hi);border-radius:10px;padding:1rem 1.1rem;
  margin-top:.6rem;text-align:left}
.intensity-block > label{font-size:.68rem;color:var(--accent);letter-spacing:.1em;
  text-transform:uppercase;display:block;margin-bottom:.75rem}
.int-row{display:flex;flex-direction:row;gap:1rem}
.int-field{display:flex;flex-direction:column;align-items:center;gap:.3rem;flex:1}
.int-field input[type=number]{width:100%;padding:.4rem .5rem;border-radius:6px;
  border:1px solid var(--line);background:var(--bg);color:var(--ink);
  font-family:'DM Mono',monospace;font-size:.9rem;font-weight:500;
  text-align:center;outline:none;-moz-appearance:textfield}
.int-field input[type=number]:focus{border-color:var(--box)}
.int-label{font-size:.65rem;color:var(--accent);letter-spacing:.08em;
  text-transform:uppercase}
.btn-gen{width:100%;margin-top:.75rem;padding:.65rem;border-radius:8px;border:none;
  background:var(--box);color:#fdfaf4;font-family:'DM Mono',monospace;
  font-size:.78rem;font-weight:500;letter-spacing:.05em;cursor:pointer;transition:all .15s}
.btn-gen:hover{background:#7a4520}

.modal-cancel{background:none;border:none;font-family:'DM Mono',monospace;
  font-size:.72rem;color:var(--accent);cursor:pointer;letter-spacing:.1em;
  text-transform:uppercase;text-decoration:underline;opacity:.7}
.modal-cancel:hover{opacity:1}

/* ── ANIMS ── */
@keyframes fadeDown{from{opacity:0;transform:translateY(-16px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.3)}100%{transform:scale(1)}}
@keyframes shimmer{0%,100%{opacity:1}50%{opacity:.35}}
@keyframes pulse{0%{filter:brightness(1)}50%{filter:brightness(1.5)}100%{filter:brightness(1)}}

.pop{animation:pop .25s ease}
.grid-refresh{animation:shimmer .35s ease}
.bar-pulse{animation:pulse .45s ease}

#confetti{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:10;display:none}

footer{margin-top:2rem;font-size:.7rem;color:var(--accent);letter-spacing:.08em;opacity:.7}
footer a{color:var(--accent);text-decoration:underline}
footer a:hover{opacity:1}