*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#f2efe9;
  --black:#111;
  --mid:#666;
  --light:#ccc;
  --lighter:#e8e4dc;
  --white:#fff;
  --border:2px solid #111;
}

html{scroll-behavior:smooth}
body{
  font-family:'DM Mono',monospace;
  background:var(--bg);
  color:var(--black);
  min-height:100vh;
  overflow-x:hidden;
}

/* ===== SCREENS ===== */
.screen{display:none;min-height:100vh;flex-direction:column}
.screen.active{display:flex}

/* ===== HOME SCREEN ===== */
#screen-home{
  background:var(--black);
  color:var(--bg);
  position:relative;
  overflow:hidden;
}

.home-bg-grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(242,239,233,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242,239,233,.05) 1px, transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}

.home-shapes-bg{
  position:absolute;inset:0;pointer-events:none;overflow:hidden;
}
.home-shapes-bg span{
  position:absolute;font-size:120px;opacity:.04;
  font-family:'DM Mono',monospace;
  animation:floatShape 20s infinite linear;
}
.home-shapes-bg span:nth-child(1){top:-5%;left:10%;animation-delay:0s}
.home-shapes-bg span:nth-child(2){top:20%;left:75%;animation-delay:5s;font-size:90px}
.home-shapes-bg span:nth-child(3){top:60%;left:5%;animation-delay:10s;font-size:150px}
.home-shapes-bg span:nth-child(4){top:80%;left:85%;animation-delay:3s;font-size:80px}
.home-shapes-bg span:nth-child(5){top:40%;left:45%;animation-delay:7s;font-size:110px}

@keyframes floatShape{
  0%{transform:translateY(0) rotate(0deg)}
  50%{transform:translateY(-30px) rotate(10deg)}
  100%{transform:translateY(0) rotate(0deg)}
}

.home-inner{
  flex:1;display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  padding:3rem 2rem;position:relative;z-index:1;
  gap:1.5rem;
}

.home-eyebrow{
  font-size:.65rem;letter-spacing:.35em;
  color:rgba(242,239,233,.5);text-transform:uppercase;
}

.home-title{
  font-family:'Bebas Neue',sans-serif;
  font-size:clamp(5rem,15vw,11rem);
  line-height:.9;letter-spacing:-.01em;
  text-align:center;
  color:var(--bg);
}

.home-title span{color:rgba(242,239,233,.2)}

.home-shapes-row{
  display:flex;gap:1.5rem;font-size:2rem;
  color:rgba(242,239,233,.6);
  margin:-.5rem 0;
}

.home-tagline{
  font-size:.8rem;color:rgba(242,239,233,.5);
  text-align:center;max-width:380px;line-height:1.6;
  letter-spacing:.02em;
}

.btn-play{
  margin-top:.5rem;
  background:var(--bg);
  color:var(--black);
  border:none;
  font-family:'Bebas Neue',sans-serif;
  font-size:1.4rem;letter-spacing:.12em;
  padding:1rem 3.5rem;
  cursor:pointer;
  position:relative;overflow:hidden;
  transition:transform .15s,box-shadow .15s;
  clip-path:polygon(8px 0%,100% 0%,calc(100% - 8px) 100%,0% 100%);
}
.btn-play:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,.4)}
.btn-play:active{transform:translateY(0)}

.home-how{
  width:100%;max-width:700px;margin-top:2rem;
  border:1px solid rgba(242,239,233,.15);
}
.home-how summary{
  padding:.9rem 1.2rem;cursor:pointer;
  font-size:.75rem;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(242,239,233,.5);list-style:none;
  display:flex;align-items:center;justify-content:space-between;
}
.home-how summary::-webkit-details-marker{display:none}
.home-how summary::after{content:'▼';font-size:.6rem;transition:transform .2s}
.home-how[open] summary::after{transform:rotate(180deg)}
.how-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:1px;background:rgba(242,239,233,.15);
  margin:1px;
}
.how-card{
  background:rgba(242,239,233,.04);
  padding:1.1rem 1.2rem;
}
.how-card h4{
  font-size:.7rem;letter-spacing:.2em;
  color:rgba(242,239,233,.4);text-transform:uppercase;margin-bottom:.5rem;
}
.how-card p{font-size:.75rem;color:rgba(242,239,233,.65);line-height:1.6}

.home-footer{
  padding:1.2rem 2rem;
  border-top:1px solid rgba(242,239,233,.1);
  font-size:.65rem;letter-spacing:.1em;
  color:rgba(242,239,233,.3);
  text-align:center;
  position:relative;z-index:1;
}
.home-footer a{color:rgba(242,239,233,.5);text-decoration:none}
.home-footer a:hover{color:var(--bg)}

/* ===== FLOW SCREENS (count, mode, setup) ===== */
.flow-screen{
  min-height:100vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  padding:3rem 1.5rem;gap:2rem;
}

.flow-back{
  position:fixed;top:1.5rem;left:1.5rem;
  background:transparent;border:var(--border);
  font-family:'DM Mono',monospace;font-size:.7rem;
  letter-spacing:.12em;padding:.5rem 1rem;cursor:pointer;
  z-index:100;transition:background .15s,color .15s;
}
.flow-back:hover{background:var(--black);color:var(--bg)}

.flow-label{
  font-size:.65rem;letter-spacing:.35em;text-transform:uppercase;
  color:var(--mid);
}
.flow-title{
  font-family:'Bebas Neue',sans-serif;
  font-size:clamp(2.5rem,8vw,5rem);
  letter-spacing:.02em;text-align:center;line-height:1;
}

.choice-grid{
  display:grid;gap:1px;background:var(--black);border:var(--border);
  width:100%;max-width:600px;
}
.choice-grid.cols-2{grid-template-columns:1fr 1fr}
.choice-grid.cols-1{grid-template-columns:1fr}

.choice-btn{
  background:var(--bg);
  padding:2rem 1.5rem;
  cursor:pointer;border:none;text-align:left;
  transition:background .15s,color .15s;
  position:relative;overflow:hidden;
}
.choice-btn:hover{background:var(--black);color:var(--bg)}
.choice-btn .cb-num{
  font-family:'Bebas Neue',sans-serif;
  font-size:3.5rem;line-height:1;color:var(--light);
  transition:color .15s;
}
.choice-btn:hover .cb-num{color:rgba(242,239,233,.2)}
.choice-btn .cb-title{
  font-family:'Bebas Neue',sans-serif;font-size:1.4rem;
  letter-spacing:.05em;margin-top:.3rem;display:block;
}
.choice-btn .cb-desc{
  font-size:.7rem;color:var(--mid);line-height:1.5;
  margin-top:.4rem;display:block;transition:color .15s;
}
.choice-btn:hover .cb-desc{color:rgba(242,239,233,.5)}

/* ===== SETUP SCREEN ===== */
.setup-form{width:100%;max-width:640px;display:flex;flex-direction:column;gap:0}

.player-row{
  display:grid;grid-template-columns:auto 1fr auto;
  align-items:center;gap:0;
  border:var(--border);border-bottom:none;
  background:var(--white);
  transition:background .1s;
}
.player-row:last-of-type{border-bottom:var(--border)}
.player-row:focus-within{background:#f9f6f0}
.player-row.ai-player{background:#f5f2ed}

.player-num{
  font-family:'Bebas Neue',sans-serif;font-size:2.5rem;
  width:60px;text-align:center;border-right:var(--border);
  color:var(--light);line-height:1;padding:.8rem .5rem;
  align-self:stretch;display:flex;align-items:center;justify-content:center;
}

.player-name-input{
  font-family:'DM Mono',monospace;font-size:.85rem;
  border:none;outline:none;background:transparent;
  padding:.9rem 1rem;width:100%;
  letter-spacing:.03em;
}
.player-name-input::placeholder{color:var(--light)}
.player-row.ai-player .player-name-input{
  color:var(--mid);
  cursor:default;
}

.player-shapes{
  display:flex;gap:0;border-left:var(--border);align-self:stretch;
}
.shape-pick-btn{
  width:46px;height:100%;border:none;
  background:transparent;cursor:pointer;
  font-size:1.2rem;transition:background .15s;
  display:flex;align-items:center;justify-content:center;
  border-left:1px solid var(--lighter);position:relative;
}
.shape-pick-btn:first-child{border-left:none}
.shape-pick-btn:hover:not(:disabled){background:var(--lighter)}
.shape-pick-btn.selected{background:var(--black);color:var(--bg)}
.shape-pick-btn:disabled{opacity:.25;cursor:not-allowed}
.shape-pick-btn .taken-x{
  position:absolute;top:2px;right:3px;font-size:.55rem;
  color:var(--mid);
}

.ai-toggle{
  display:flex;align-items:center;gap:.6rem;padding:.9rem 1rem;
  border-left:var(--border);cursor:pointer;
  background:transparent;border:none;font-family:'DM Mono',monospace;
  font-size:.8rem;user-select:none;width:100%;
}
.ai-toggle input[type="checkbox"]{
  width:18px;height:18px;cursor:pointer;
}
.ai-toggle-label{color:var(--mid);transition:color .15s}
.player-row.ai-player .ai-toggle-label{color:#27ae60}

.btn-start{
  margin-top:1.5rem;
  background:var(--black);color:var(--bg);
  border:none;font-family:'Bebas Neue',sans-serif;
  font-size:1.2rem;letter-spacing:.12em;
  padding:1.1rem;cursor:pointer;
  width:100%;transition:opacity .15s;
}
.btn-start:hover{opacity:.85}
.btn-start:disabled{opacity:.3;cursor:not-allowed}

/* ===== GAME SCREEN ===== */
#screen-game{
  display:none;flex-direction:column;min-height:100vh;
}
#screen-game.active{display:flex}

.game-topbar{
  background:var(--black);color:var(--bg);
  display:flex;align-items:center;justify-content:space-between;
  padding:.75rem 1.25rem;gap:1rem;flex-wrap:wrap;
  border-bottom:3px solid var(--black);
  position:sticky;top:0;z-index:50;
}
.topbar-logo{
  font-family:'Bebas Neue',sans-serif;font-size:1.3rem;
  letter-spacing:.08em;opacity:.4;white-space:nowrap;
}
.topbar-turn{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:.2rem;
}
.turn-label{
  font-size:.6rem;letter-spacing:.25em;text-transform:uppercase;
  opacity:.5;
}
.turn-player{
  font-family:'Bebas Neue',sans-serif;font-size:1.6rem;
  letter-spacing:.05em;
}
.turn-ai-indicator{
  font-size:.65rem;color:#27ae60;letter-spacing:.1em;text-transform:uppercase;
  margin-top:.1rem;
}
.turn-shape-fixed{
  font-size:1.1rem;opacity:.8;margin-top:-.15rem;
}
.turn-shape-free{
  display:flex;gap:.4rem;align-items:center;margin-top:.1rem;flex-wrap:wrap;
  justify-content:center;
}
.free-shape-btn{
  background:rgba(242,239,233,.1);border:1px solid rgba(242,239,233,.3);
  color:var(--bg);font-size:1.1rem;
  width:38px;height:38px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:background .15s,border-color .15s;
  border-radius:2px;
  font-family:'DM Mono',monospace;
}
.free-shape-btn:hover{background:rgba(242,239,233,.2)}
.free-shape-btn.selected{
  background:var(--bg);color:var(--black);
  border-color:var(--bg);
}
.free-shape-btn:disabled{opacity:.4;cursor:not-allowed}
.topbar-counter{
  font-family:'Bebas Neue',sans-serif;font-size:1rem;
  opacity:.4;letter-spacing:.05em;white-space:nowrap;text-align:right;
}

.scoreboard{
  background:var(--lighter);
  display:flex;gap:0;flex-wrap:wrap;
  border-bottom:var(--border);
}
.score-card{
  flex:1;min-width:120px;
  padding:.65rem 1rem;
  border-right:1px solid var(--light);
  display:flex;align-items:center;gap:.6rem;
  transition:background .2s;
  position:relative;
}
.score-card:last-child{border-right:none}
.score-card.active-player{background:var(--black);color:var(--bg)}
.score-card.ai-player::after{
  content:'🤖';font-size:.7rem;position:absolute;top:.3rem;right:.4rem;
}
.score-shape{font-size:1.1rem}
.score-info{flex:1;overflow:hidden}
.score-name{
  font-size:.7rem;font-weight:500;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.score-pts{
  font-family:'Bebas Neue',sans-serif;font-size:1.5rem;
  line-height:1;
}
.score-pts-label{font-size:.55rem;opacity:.5;letter-spacing:.08em;margin-left:.15rem}

.game-body{
  flex:1;display:flex;flex-direction:column;
  align-items:center;justify-content:flex-start;
  padding:1.5rem 1rem;
  overflow:auto;
  position:relative;
}

.board-wrap{overflow:auto;-webkit-overflow-scrolling:touch;max-width:100%}

#game-board{
  display:grid;
  background:var(--black);
  gap:1px;
  border:2px solid var(--black);
  width:fit-content;
  margin:0 auto;
}

.cell{
  background:var(--white);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  font-size:1rem;
  transition:background .1s;
  user-select:none;
  position:relative;
}
.cell:hover:not(.filled){background:#f0ede8}
.cell.filled{cursor:default}
.cell .cell-sym{
  display:inline-block;
  animation:popIn .2s cubic-bezier(.175,.885,.32,1.275) both;
}
@keyframes popIn{
  0%{transform:scale(0) rotate(-10deg);opacity:0}
  100%{transform:scale(1) rotate(0deg);opacity:1}
}

.hint-msg{
  font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--mid);margin-bottom:.8rem;text-align:center;
}

/* ===== SCORE LINE FLASH ===== */
.cell.score-flash{animation:scoreFlash .6s ease both}
@keyframes scoreFlash{
  0%{background:#111}
  40%{background:#f9f600}
  100%{background:var(--white)}
}

/* ===== GAME OVER ===== */
#gameover-overlay{
  display:none;position:fixed;inset:0;z-index:200;
  background:rgba(17,17,17,.92);
  align-items:center;justify-content:center;flex-direction:column;
  gap:1.5rem;padding:2rem;
}
#gameover-overlay.visible{display:flex}

.go-inner{
  background:var(--bg);
  padding:3rem 2.5rem;
  max-width:480px;width:100%;
  border:3px solid var(--black);
  text-align:center;display:flex;flex-direction:column;gap:1rem;
  animation:slideUp .35s cubic-bezier(.175,.885,.32,1.275) both;
}
@keyframes slideUp{
  from{transform:translateY(40px);opacity:0}
  to{transform:translateY(0);opacity:1}
}
.go-eyebrow{font-size:.6rem;letter-spacing:.3em;text-transform:uppercase;color:var(--mid)}
.go-crown{font-size:3rem;margin:-.5rem 0}
.go-winner{font-family:'Bebas Neue',sans-serif;font-size:3.2rem;line-height:1}
.go-score{font-size:.8rem;color:var(--mid)}

.go-results{
  display:grid;gap:1px;background:var(--light);border:1px solid var(--light);
  margin-top:.5rem;
}
.go-row{
  display:flex;align-items:center;justify-content:space-between;
  background:var(--white);padding:.7rem 1rem;gap:.5rem;
}
.go-row.winner{background:var(--black);color:var(--bg)}
.go-row-name{font-size:.8rem;display:flex;align-items:center;gap:.5rem}
.go-row-pts{font-family:'Bebas Neue',sans-serif;font-size:1.5rem}

.btn-again{
  background:var(--black);color:var(--bg);
  border:none;font-family:'Bebas Neue',sans-serif;
  font-size:1.1rem;letter-spacing:.12em;
  padding:.9rem 2.5rem;cursor:pointer;transition:opacity .15s;
}
.btn-again:hover{opacity:.8}

/* ===== ANIMATIONS ===== */
.fade-in{animation:fadeIn .3s ease both}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}