:root{
  --bg:#090d1a;--text:#e2e8f0;--dim:#64748b;
  --purple:#a855f7;--x:#60a5fa;--o:#f472b6;
  --font:"Inter","Cairo",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0}
body{
  min-height:100vh;font-family:var(--font);
  background:var(--bg);color:var(--text);
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
  background-image:
    radial-gradient(ellipse 70% 50% at 10% 0%,rgba(96,165,250,.15),transparent),
    radial-gradient(ellipse 60% 50% at 90% 100%,rgba(244,114,182,.12),transparent);
}

.home-btn{
  position:fixed;left:14px;top:14px;z-index:70;
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;text-decoration:none;
  background:rgba(0,0,0,.5);backdrop-filter:blur(16px);
  transition:transform .15s,background .2s;
}
.home-btn:hover{transform:scale(1.08);background:rgba(0,0,0,.65)}

.fullscreen{
  position:fixed;inset:0;z-index:30;
  display:none;align-items:center;justify-content:center;
}
.fullscreen.active{display:flex;animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ── JOIN ── */
.join-wrap{width:min(440px,94vw);display:flex;flex-direction:column}
.join-hero{text-align:center;padding:30px 20px 16px}
.hero-icon{font-size:2.8rem;letter-spacing:10px}
.join-hero h1{
  margin:12px 0 4px;font-size:1.8rem;font-weight:900;
  background:linear-gradient(135deg,var(--x),var(--o));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.join-hero p{color:var(--dim);font-size:.9rem}
.join-form{
  display:flex;gap:10px;
  background:rgba(0,0,0,.35);backdrop-filter:blur(20px);
  border-radius:16px;padding:16px;
}
.join-form input{
  flex:1;padding:10px 14px;font-size:.95rem;
  border-radius:12px;border:1px solid rgba(71,85,105,.4);
  background:rgba(15,23,42,.8);color:var(--text);
}
.join-form input:focus{outline:none;border-color:rgba(168,85,247,.5)}
.status{text-align:center;margin-top:12px;font-size:.9rem;color:var(--dim);min-height:24px}

/* ── GAME ── */
.game-wrap{
  width:min(480px,96vw);
  display:flex;flex-direction:column;align-items:center;gap:16px;
}

.players-bar{
  display:flex;align-items:center;justify-content:space-between;
  width:100%;gap:12px;
}
.player-tag{
  display:flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:14px;
  background:rgba(0,0,0,.35);backdrop-filter:blur(12px);
  border:1px solid rgba(100,116,139,.2);
  flex:1;
}
.player-tag.active-turn{
  border-color:rgba(168,85,247,.5);
  box-shadow:0 0 18px rgba(168,85,247,.15);
}
.player-tag.winner-tag{
  border-color:rgba(34,197,94,.5);
  box-shadow:0 0 20px rgba(34,197,94,.15);
}
.tag-symbol{
  font-size:1.4rem;font-weight:900;
}
.x-color{color:var(--x)}
.o-color{color:var(--o)}
.tag-name{font-size:.88rem;font-weight:700;color:#94a3b8}

.score-box{
  display:flex;align-items:center;gap:6px;
  padding:8px 16px;border-radius:999px;
  background:rgba(0,0,0,.45);backdrop-filter:blur(12px);
  font-size:1.2rem;font-weight:900;
  flex-shrink:0;
}
.score-box span:first-child{color:var(--x)}
.score-box span:last-child{color:var(--o)}
.score-sep{color:var(--dim)}

.turn-label{
  font-size:.9rem;font-weight:700;color:var(--dim);
  min-height:24px;
}

/* ── BOARD ── */
.board{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:12px;width:100%;max-width:380px;
}

.cell{
  aspect-ratio:1/1;border-radius:18px;
  border:2px solid rgba(100,116,139,.25);
  background:rgba(0,0,0,.3);
  backdrop-filter:blur(8px);
  font-size:2.8rem;font-weight:900;
  color:transparent;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:transform .12s,border-color .2s,box-shadow .2s,background .2s;
  position:relative;
}
.cell:hover:not(.taken):not(.done){
  transform:translateY(-3px) scale(1.03);
  border-color:rgba(168,85,247,.5);
  box-shadow:0 8px 24px rgba(168,85,247,.15);
  background:rgba(168,85,247,.06);
}
.cell:active:not(.taken):not(.done){
  transform:translateY(0) scale(.97);
}
.cell.taken{cursor:default}
.cell.done{cursor:default;opacity:.7}

.cell.x-mark{
  color:var(--x);
  border-color:rgba(96,165,250,.35);
  box-shadow:0 0 16px rgba(96,165,250,.1);
  animation:markPop .35s cubic-bezier(.34,1.56,.64,1);
}
.cell.o-mark{
  color:var(--o);
  border-color:rgba(244,114,182,.35);
  box-shadow:0 0 16px rgba(244,114,182,.1);
  animation:markPop .35s cubic-bezier(.34,1.56,.64,1);
}
.cell.win-cell{
  border-color:rgba(34,197,94,.6)!important;
  box-shadow:0 0 24px rgba(34,197,94,.25)!important;
  background:rgba(34,197,94,.08)!important;
  opacity:1!important;
  animation:winPulse .6s ease infinite alternate;
}

@keyframes markPop{
  0%{transform:scale(.3);opacity:0}
  60%{transform:scale(1.12)}
  100%{transform:scale(1);opacity:1}
}
@keyframes winPulse{
  0%{box-shadow:0 0 24px rgba(34,197,94,.2)}
  100%{box-shadow:0 0 36px rgba(34,197,94,.35)}
}

.result-box{text-align:center;margin-top:4px}
.result-text{
  font-size:1.4rem;font-weight:900;margin-bottom:10px;
}
.result-text.win{color:#86efac}
.result-text.lose{color:#fca5a5}
.result-text.draw{color:#fde68a}

.btn{
  border:none;border-radius:12px;padding:10px 22px;
  font-size:.88rem;font-weight:700;color:#fff;cursor:pointer;
  transition:transform .12s,box-shadow .2s,filter .2s;
}
.btn:not(:disabled):hover{transform:translateY(-1px);filter:brightness(1.08)}
.btn:not(:disabled):active{transform:translateY(1px) scale(.98)}
.btn:disabled{opacity:.35;cursor:not-allowed}
.btn--start{
  padding:12px 36px;font-size:1rem;
  background:linear-gradient(135deg,#7c3aed,#4f46e5);
  box-shadow:0 8px 28px rgba(124,58,237,.35);border-radius:14px;
}
.btn--primary{
  background:linear-gradient(135deg,#7c3aed,#6d28d9);
  box-shadow:0 6px 20px rgba(124,58,237,.3);
}

.hidden{display:none!important}

@media(max-width:500px){
  .board{gap:8px;max-width:320px}
  .cell{font-size:2.2rem;border-radius:14px}
}