@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@300;400;600;700&family=Cinzel:wght@400;600&display=swap');

:root {
  --gold:       #c9a84c;
  --gold-light: #e8c97a;
  --gold-dark:  #8a6a2a;
  --gold-glow:  rgba(201,168,76,.4);
  --bg:         #0e0b05;
  --panel-bg:   linear-gradient(160deg,#3a2a0c,#1e1408);
  --panel-b:    #7a5a1a;
  --ok:         #60d870;
  --err:        #e06060;
  --hint:       #60b8e8;
}
*{box-sizing:border-box;margin:0;padding:0;}
html,body{height:100%;}
body{
  background:var(--bg);
  background-image:radial-gradient(ellipse at 15% 15%,#241806 0%,transparent 55%),
                   radial-gradient(ellipse at 85% 85%,#160e03 0%,transparent 55%);
  min-height:100vh; display:flex; flex-direction:column; align-items:center;
  padding:12px 10px 60px; font-family:'Rajdhani',sans-serif; color:var(--gold-light);
  user-select:none; -webkit-user-select:none;
}

/* ── HEADER ── */
h1{
  font-family:'Orbitron',monospace; font-weight:900;
  font-size:clamp(1.2rem,4vw,2.3rem); letter-spacing:.2em; color:var(--gold-light);
  text-shadow:0 0 30px var(--gold-glow),0 0 70px rgba(201,168,76,.15);
  text-transform:uppercase; margin-bottom:2px;
}
.subtitle{
  font-family:'Cinzel',serif; font-size:.72rem; color:var(--gold-dark);
  letter-spacing:.3em; text-transform:uppercase; margin-bottom:14px;
}

/* ── TABS ── */
.tab-bar{
  display:flex;gap:4px;justify-content:center;flex-wrap:wrap;margin-bottom:16px;
  background:rgba(0,0,0,.3);border:1px solid var(--panel-b);border-radius:12px;padding:5px;
}
.tab-btn{
  font-family:'Orbitron',monospace;font-size:.55rem;font-weight:700;
  letter-spacing:.08em;padding:8px 14px;border-radius:8px;
  border:none;cursor:pointer;text-transform:uppercase;transition:all .25s;
  background:transparent;color:var(--gold-dark);
}
.tab-btn:hover{background:rgba(201,168,76,.1);color:var(--gold-light);}
.tab-btn.active{
  background:linear-gradient(135deg,var(--gold-dark),#5a3a08);
  color:var(--gold-light);box-shadow:0 2px 12px rgba(201,168,76,.25);
}
.tab-panel{display:none;width:100%;max-width:1160px;}
.tab-panel.active{display:block;}

/* ── GAME TAB ── */
.main-layout{display:flex;gap:14px;align-items:flex-start;width:100%;}
.game-col{
  flex:1 1 auto; min-width:0;
  background:var(--panel-bg); border:2px solid var(--panel-b); border-radius:18px;
  padding:14px 12px 16px;
  box-shadow:0 0 50px rgba(201,168,76,.1),inset 0 0 40px rgba(0,0,0,.5);
}
.side-col{flex:0 0 272px;display:flex;flex-direction:column;gap:12px;}
.side-panel{
  background:var(--panel-bg); border:2px solid var(--panel-b); border-radius:18px;
  padding:13px 12px;
  box-shadow:0 0 40px rgba(201,168,76,.07),inset 0 0 30px rgba(0,0,0,.4);
}
.options{
  display:flex;align-items:center;gap:14px;justify-content:center;margin-bottom:10px;
  font-size:.74rem;color:var(--gold-dark);font-weight:600;letter-spacing:.07em;flex-wrap:wrap;
}
.options label{display:flex;align-items:center;gap:5px;cursor:pointer;}
select{
  background:#1a1005;color:var(--gold-light);border:1px solid var(--gold-dark);
  border-radius:5px;padding:2px 8px;font-family:'Rajdhani',sans-serif;font-size:.82rem;
}
.stats-bar{display:flex;justify-content:center;gap:22px;margin-bottom:10px;flex-wrap:wrap;}
.stat-item{display:flex;flex-direction:column;align-items:center;}
.stat-val{font-family:'Orbitron',monospace;font-size:1.05rem;font-weight:700;color:var(--gold-light);line-height:1;}
.stat-lbl{font-size:.56rem;color:var(--gold-dark);letter-spacing:.12em;text-transform:uppercase;margin-top:2px;}
.canvas-wrap{
  position:relative;width:100%;border-radius:12px;overflow:hidden;
  background:rgba(0,0,0,.28);border:1px solid rgba(138,106,42,.22);margin-bottom:10px;
  touch-action:none;
}
canvas{display:block;width:100%;touch-action:none;}
.message{
  text-align:center;font-family:'Orbitron',monospace;font-size:.68rem;
  min-height:20px;margin-bottom:9px;letter-spacing:.07em;color:var(--gold-light);
  transition:color .3s;
}
.message.win{color:var(--ok);text-shadow:0 0 14px rgba(80,220,80,.5);}
.message.err{color:var(--err);}
.message.info{color:var(--gold);}
.controls{display:flex;gap:7px;justify-content:center;flex-wrap:wrap;}
button{
  font-family:'Orbitron',monospace;font-size:.58rem;font-weight:700;
  letter-spacing:.08em;padding:8px 13px;border-radius:7px;
  border:none;cursor:pointer;text-transform:uppercase;transition:all .2s;
}
#btn-new{
  background:linear-gradient(135deg,var(--gold),var(--gold-dark));
  color:#1a1005;box-shadow:0 3px 12px rgba(201,168,76,.3);
}
#btn-new:hover{box-shadow:0 3px 22px rgba(201,168,76,.55);transform:translateY(-1px);}
#btn-undo{background:rgba(255,255,255,.06);color:var(--gold-dark);border:1px solid var(--gold-dark);}
#btn-undo:hover:not(:disabled){background:rgba(255,255,255,.13);color:var(--gold-light);}
#btn-undo:disabled{opacity:.3;cursor:not-allowed;}
#btn-solve{background:rgba(60,60,200,.18);color:#8080e0;border:1px solid #404080;}
#btn-solve:hover{background:rgba(60,60,200,.32);}
#btn-solve.active{background:rgba(60,200,60,.18);color:#80e080;border-color:#408040;}
.panel-title{
  font-family:'Orbitron',monospace;font-size:.7rem;font-weight:700;
  letter-spacing:.13em;color:var(--gold-light);margin-bottom:8px;
  text-align:center;text-transform:uppercase;
}
.moves-info{display:flex;justify-content:space-between;font-size:.67rem;color:var(--gold-dark);margin-bottom:3px;}
.pb-wrap{width:100%;height:7px;background:rgba(0,0,0,.4);border-radius:4px;overflow:hidden;margin-bottom:6px;border:1px solid rgba(138,106,42,.22);}
.pb-fill{height:100%;border-radius:4px;transition:width .4s ease;background:linear-gradient(90deg,var(--gold-dark),var(--gold),var(--gold-light));}
.eff-label{font-size:.61rem;color:var(--gold-dark);text-align:center;margin-bottom:9px;line-height:1.5;}
.eff-label strong{color:var(--gold-light);}
.min-table{width:100%;border-collapse:collapse;font-size:.72rem;}
.min-table th{
  font-family:'Orbitron',monospace;font-size:.5rem;letter-spacing:.08em;
  color:var(--gold-dark);padding:4px 3px;text-align:center;
  border-bottom:1px solid var(--gold-dark);background:rgba(0,0,0,.3);
}
.min-table td{padding:3px 3px;text-align:center;border-bottom:1px solid rgba(138,106,42,.12);font-family:'Rajdhani',sans-serif;font-weight:600;}
.min-table tr.cur td{background:rgba(201,168,76,.09);}
.min-table tr.cur td:first-child{border-left:2px solid var(--gold);}
.n-col{color:var(--gold-dark);font-family:'Orbitron',monospace;font-size:.58rem;}
.min-col{color:var(--gold-light);}
.formula-col{font-size:.56rem;color:rgba(138,106,42,.65);font-family:'Orbitron',monospace;}
.assist-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.assist-toggle{
  font-family:'Orbitron',monospace;font-size:.5rem;font-weight:700;
  letter-spacing:.07em;padding:5px 9px;border-radius:5px;
  border:1px solid var(--gold-dark);background:rgba(201,168,76,.07);
  color:var(--gold-dark);cursor:pointer;transition:all .2s;text-transform:uppercase;
}
.assist-toggle:hover{background:rgba(201,168,76,.18);color:var(--gold-light);}
.assist-toggle.active{background:rgba(201,168,76,.22);color:var(--gold-light);border-color:var(--gold);}
.assist-body{overflow:hidden;max-height:0;transition:max-height .4s ease;}
.assist-body.open{max-height:700px;}
.steps-remaining{
  background:rgba(0,0,0,.4);border-radius:8px;padding:7px 10px;
  border:1px solid rgba(96,184,232,.25);margin-bottom:8px;text-align:center;
}
.steps-remaining .big{font-family:'Orbitron',monospace;font-size:1.2rem;font-weight:700;color:var(--gold-light);display:block;}
.steps-remaining .lbl{font-size:.58rem;color:var(--gold-dark);letter-spacing:.1em;text-transform:uppercase;}
.opt-card{
  background:rgba(0,0,0,.4);border:1px solid rgba(96,184,232,.3);
  border-radius:10px;padding:10px 12px;margin-bottom:8px;position:relative;overflow:hidden;
}
.opt-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(96,184,232,.6),transparent);
}
.opt-card-title{font-family:'Orbitron',monospace;font-size:.54rem;color:var(--hint);letter-spacing:.1em;margin-bottom:6px;text-transform:uppercase;}
.opt-move-row{display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:6px;}
.peg-badge{
  width:34px;height:34px;border-radius:8px;border:2px solid rgba(201,168,76,.35);
  background:rgba(0,0,0,.3);display:flex;align-items:center;justify-content:center;
  font-family:'Orbitron',monospace;font-size:.8rem;font-weight:700;color:var(--gold-light);flex-shrink:0;
}
.peg-badge.src{border-color:var(--gold);background:rgba(201,168,76,.15);box-shadow:0 0 10px var(--gold-glow);color:var(--gold-light);}
.peg-badge.dst{border-color:var(--hint);background:rgba(96,184,232,.12);box-shadow:0 0 10px rgba(96,184,232,.3);color:#a0d8f0;}
.peg-arrow{font-size:1.2rem;color:var(--gold-dark);}
.opt-disc-preview{display:flex;justify-content:center;margin-bottom:6px;}
.disc-mini{height:14px;border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:.58rem;font-weight:700;color:rgba(255,255,255,.65);}
.opt-rationale{font-size:.67rem;color:rgba(200,180,120,.75);text-align:center;line-height:1.55;}
.opt-rationale em{color:var(--gold-light);font-style:normal;}
.strat-card{background:rgba(0,0,0,.3);border-radius:8px;padding:9px 11px;border:1px solid rgba(138,106,42,.22);margin-bottom:6px;}
.strat-card-title{font-family:'Orbitron',monospace;font-size:.52rem;color:var(--gold);letter-spacing:.1em;margin-bottom:4px;text-transform:uppercase;}
.strat-card-text{font-size:.69rem;color:rgba(200,180,120,.8);line-height:1.55;}
.strat-card-text em{color:var(--gold-light);font-style:normal;}
.hint-btn{
  display:block;width:100%;text-align:center;
  font-family:'Orbitron',monospace;font-size:.54rem;font-weight:700;
  letter-spacing:.07em;padding:7px;border-radius:7px;margin-top:4px;
  border:1px solid rgba(138,106,42,.4);background:rgba(201,168,76,.06);
  color:var(--gold-dark);cursor:pointer;transition:all .2s;text-transform:uppercase;
}
.hint-btn:hover{background:rgba(201,168,76,.16);color:var(--gold-light);border-color:var(--gold);}
.win-overlay{position:fixed;inset:0;background:rgba(0,0,0,.85);display:flex;align-items:center;justify-content:center;z-index:100;opacity:0;pointer-events:none;transition:opacity .5s;}
.win-overlay.show{opacity:1;pointer-events:all;}
.win-box{background:linear-gradient(160deg,#3d2c0e,#251a06);border:2px solid var(--gold);border-radius:20px;padding:30px 44px;text-align:center;max-width:360px;box-shadow:0 0 70px var(--gold-glow),0 0 140px rgba(201,168,76,.12);}
.win-trophy{font-size:3.2rem;display:block;margin-bottom:10px;animation:pulse 1.2s ease-in-out infinite;}
@keyframes pulse{0%,100%{transform:scale(1);}50%{transform:scale(1.12);}}
.win-title{font-family:'Orbitron',monospace;font-weight:900;font-size:1.4rem;color:var(--gold-light);text-shadow:0 0 20px var(--gold-glow);margin-bottom:6px;}
.win-stats{font-size:.82rem;color:var(--gold-dark);margin-bottom:18px;line-height:2;}
.win-stats strong{color:var(--gold-light);}
.win-btn{font-family:'Orbitron',monospace;font-size:.68rem;font-weight:700;padding:11px 26px;border-radius:10px;border:none;background:linear-gradient(135deg,var(--gold),var(--gold-dark));color:#1a1005;cursor:pointer;letter-spacing:.1em;box-shadow:0 4px 18px rgba(201,168,76,.35);transition:all .2s;}
.win-btn:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(201,168,76,.5);}
.particle{position:fixed;pointer-events:none;z-index:99;border-radius:50%;animation:pfall 1.9s ease-in forwards;}
@keyframes pfall{0%{transform:translateY(-30px) rotate(0deg);opacity:1;}100%{transform:translateY(105vh) rotate(720deg);opacity:0;}}

/* ── CONTENT TABS (Cómo jugar, Estrategias, Teoría) ── */
.content-panel{
  background:var(--panel-bg);border:2px solid var(--panel-b);border-radius:18px;
  padding:28px 32px;
  box-shadow:0 0 50px rgba(201,168,76,.1),inset 0 0 40px rgba(0,0,0,.5);
}
.content-panel h2{
  font-family:'Orbitron',monospace;font-size:1rem;font-weight:900;
  color:var(--gold-light);letter-spacing:.15em;text-transform:uppercase;
  margin-bottom:6px;border-bottom:1px solid rgba(138,106,42,.4);padding-bottom:10px;
}
.content-panel h3{
  font-family:'Orbitron',monospace;font-size:.72rem;font-weight:700;
  color:var(--gold);letter-spacing:.12em;text-transform:uppercase;
  margin:22px 0 8px;
}
.content-panel p{
  font-size:.9rem;color:rgba(232,201,122,.82);line-height:1.75;margin-bottom:10px;
}
.content-panel em{color:var(--gold-light);font-style:normal;font-weight:700;}
.rule-box{
  background:rgba(0,0,0,.35);border:1px solid rgba(201,168,76,.25);
  border-radius:12px;padding:14px 18px;margin:12px 0;
}
.rule-box p{margin-bottom:0;}
.tip-box{
  background:rgba(96,184,232,.06);border:1px solid rgba(96,184,232,.28);
  border-radius:12px;padding:14px 18px;margin:12px 0;
  border-left:3px solid var(--hint);
}
.tip-box p{margin-bottom:0;color:rgba(200,220,240,.8);}
.warn-box{
  background:rgba(224,96,96,.06);border:1px solid rgba(224,96,96,.28);
  border-radius:12px;padding:14px 18px;margin:12px 0;
  border-left:3px solid var(--err);
}
.warn-box p{margin-bottom:0;color:rgba(240,200,200,.8);}

/* Visual example discs */
.ex-board{display:flex;gap:24px;justify-content:center;flex-wrap:wrap;margin:18px 0;}
.ex-peg-wrap{display:flex;flex-direction:column;align-items:center;gap:4px;}
.ex-peg-label{font-family:'Orbitron',monospace;font-size:.55rem;color:var(--gold-dark);letter-spacing:.1em;margin-bottom:4px;}
.ex-peg-area{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100px;width:120px;}
.ex-rod{position:absolute;left:50%;top:0;transform:translateX(-50%);width:8px;height:90px;background:linear-gradient(180deg,#c4900c,#6a4808);border-radius:4px;}
.ex-base{width:120px;height:10px;background:linear-gradient(90deg,#6a4808,#c4900c,#6a4808);border-radius:5px;margin-top:2px;}
.ex-disc{border-radius:6px;height:16px;display:flex;align-items:center;justify-content:center;font-size:.58rem;font-weight:700;color:rgba(255,255,255,.6);margin-bottom:1px;position:relative;z-index:2;}
.arrow-step{text-align:center;font-family:'Orbitron',monospace;font-size:.6rem;color:var(--hint);margin:4px 0;letter-spacing:.1em;}

/* Math formulas */
.formula-block{
  background:rgba(0,0,0,.45);border:1px solid rgba(201,168,76,.2);
  border-radius:10px;padding:16px 20px;margin:14px 0;text-align:center;
  font-family:'Orbitron',monospace;font-size:.9rem;color:var(--gold-light);
  letter-spacing:.05em;
}
.formula-block .formula-label{font-size:.55rem;color:var(--gold-dark);letter-spacing:.12em;text-transform:uppercase;display:block;margin-bottom:8px;}
.formula-block .f{font-size:1.1rem;font-weight:700;color:var(--gold-light);}
.formula-block .sub{font-size:.8rem;}
.formula-block .frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;}
.formula-block .frac span{border-top:1px solid var(--gold-light);padding:1px 4px;}

/* Strategy table */
.strat-table{width:100%;border-collapse:collapse;font-size:.78rem;margin:14px 0;}
.strat-table th{
  font-family:'Orbitron',monospace;font-size:.52rem;color:var(--gold-dark);
  padding:8px 10px;text-align:left;border-bottom:1px solid var(--gold-dark);
  background:rgba(0,0,0,.3);letter-spacing:.08em;text-transform:uppercase;
}
.strat-table td{padding:9px 10px;border-bottom:1px solid rgba(138,106,42,.12);vertical-align:top;color:rgba(232,201,122,.8);line-height:1.55;}
.strat-table td strong{color:var(--gold-light);}
.strat-table tr:hover td{background:rgba(201,168,76,.04);}

/* Seq demo */
.seq-demo{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:10px 0;}
.seq-step{
  background:rgba(0,0,0,.4);border:1px solid rgba(138,106,42,.3);border-radius:8px;
  padding:6px 10px;font-size:.7rem;color:var(--gold-dark);text-align:center;
  font-family:'Rajdhani',sans-serif;font-weight:600;
}
.seq-step strong{color:var(--gold-light);display:block;font-family:'Orbitron',monospace;font-size:.62rem;}
.seq-arrow{color:var(--gold-dark);font-size:1.1rem;}

/* Parity badge */
.badge{
  display:inline-block;padding:2px 9px;border-radius:20px;font-size:.6rem;font-weight:700;
  font-family:'Orbitron',monospace;letter-spacing:.08em;margin-left:6px;
  background:rgba(201,168,76,.15);border:1px solid rgba(201,168,76,.4);color:var(--gold);
}

/* ── RESPONSIVE ── */
@media(max-width:780px){
  .main-layout{flex-direction:column;align-items:center;}
  .side-col{flex:none;width:100%;max-width:440px;flex-direction:row;flex-wrap:wrap;}
  .side-panel{flex:1 1 200px;}
  .content-panel{padding:18px 16px;}
  .tab-btn{font-size:.5rem;padding:7px 10px;}
}
@media(max-width:420px){
  .tab-btn{font-size:.44rem;padding:6px 8px;letter-spacing:.04em;}
  .ex-board{gap:12px;}
  .ex-peg-area{width:90px;}
  .ex-base{width:90px;}
}