/* Dualdle 2.0 — polished UI */
:root{
  --bg:#121213;
  --fg:#ffffff;
  --tile-border:#3a3a3c;
  --absent:#3a3a3c;
  --present:#b59f3b;
  --correct:#538d4e;
  --panel:#1a1a1b;
  --muted:#9aa0a6;
}
:root.light{
  --bg:#fafafa;
  --fg:#111;
  --tile-border:#d3d6da;
  --absent:#787c7e;
  --present:#c9b458;
  --correct:#6aaa64;
  --panel:#fff;
  --muted:#444;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif;
  background:var(--bg);
  color:var(--fg);
  display:flex;
  flex-direction:column;
  align-items:center;
}

.home-link{
  position: fixed;
  top: 14px;
  left: 14px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--fg);
  text-decoration: none;
  z-index: 20;
}
:root.light .home-link{
  background: rgba(0,0,0,0.06);
  border-color: rgba(0,0,0,0.1);
  color:#111;
}

.header{width:100%; max-width:920px; padding:16px 16px 0; text-align:center;}
h1{margin:0; letter-spacing:2px;}
.subtitle{margin-top:6px; color:var(--muted)}
.controls{margin-top:10px; display:flex; gap:8px; justify-content:center; flex-wrap:wrap;}
.btn{
  background:#2a2a2b; color:var(--fg); border:1px solid #3a3a3c;
  padding:8px 12px; border-radius:8px; cursor:pointer;
}
:root.light .btn{ background:#f2f2f2; border-color:#ddd; }

.btn:hover{filter:brightness(1.05)}

.boards{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
  width:100%;
  max-width:920px;
  padding:16px;
}
.board-wrap{background:transparent; border-radius:12px;}
.board-title{margin:6px 0 8px 2px; font-size:14px; color:var(--muted); font-weight:600; letter-spacing:.5px;}

.board{
  display:grid;
  grid-template-columns:repeat(5, 56px);
  grid-template-rows:repeat(7, 56px);
  gap:6px;
  justify-content:center;
}
.tile{
  width:56px; height:56px;
  border:2px solid var(--tile-border);
  display:flex; align-items:center; justify-content:center;
  text-transform:uppercase; font-weight:800; font-size:28px;
  border-radius:6px;
  transition:transform .12s;
  will-change:transform;
  background:transparent;
}
.tile.filled{border-color:#565758}
.tile.absent{background:var(--absent); border-color:var(--absent); color:#fff;}
.tile.present{background:var(--present); border-color:var(--present); color:#fff;}
.tile.correct{background:var(--correct); border-color:var(--correct); color:#fff;}

.keyboard{width:100%; max-width:700px; padding:8px 16px 24px;}
.key-row{display:flex; justify-content:center; gap:6px; margin:6px 0;}
.key{
  background:#818384; color:#fff; border:none; border-radius:6px;
  min-width:40px; padding:12px 10px; text-align:center; font-weight:700;
  cursor:pointer; user-select:none;
}
:root.light .key{ background:#d3d6da; color:#111; }
.key.correct{background:var(--correct)}
.key.present{background:var(--present)}
.key.absent{background:var(--absent)}
.key.wide{min-width:70px}

.toast{
  position:fixed; top:16px; left:50%; transform:translateX(-50%);
  background:#333; color:#fff; padding:10px 16px; border-radius:6px;
  opacity:0; transition:opacity .25s ease; z-index:1000; pointer-events:none;
  font-weight:700;
}
.toast.show{opacity:1}

.modal{
  position:fixed; inset:0; background:rgba(0,0,0,.6);
  display:flex; align-items:center; justify-content:center; z-index:2000;
}
.modal.hidden{display:none}
.modal-content{
  background:var(--panel); border:1px solid #2d2d2f; color:var(--fg);
  width:min(92vw, 520px); border-radius:12px; padding:16px; position:relative;
}
.modal-close{
  position:absolute; right:10px; top:10px; border:none; background:transparent;
  color:#bbb; font-size:18px; cursor:pointer;
}
.result-answers{margin:12px 0; color:var(--muted)}

.legend.correct{color:var(--correct); font-weight:800}
.legend.present{color:var(--present); font-weight:800}
.legend.absent{color:var(--absent); font-weight:800}

.stats-grid{display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:10px;}
.stat{background:#222; border:1px solid #333; border-radius:8px; padding:10px; text-align:center;}
:root.light .stat{ background:#fff; border-color:#eee; }
.stat h3{margin:0; font-size:13px; color:var(--muted); font-weight:600}
.stat .val{font-size:20px; font-weight:800; margin-top:6px}

@keyframes shake{
  0%{transform:translateX(0)}
  20%{transform:translateX(-8px)}
  40%{transform:translateX(8px)}
  60%{transform:translateX(-8px)}
  80%{transform:translateX(8px)}
  100%{transform:translateX(0)}
}
.shake{animation:shake .35s}

@keyframes flip{
  0%{transform:rotateX(0)}
  50%{transform:rotateX(90deg)}
  100%{transform:rotateX(0)}
}
.flip{animation:flip .5s ease}

@media (max-width:820px){
  .boards{grid-template-columns:1fr; gap:10px;}
  .board{grid-template-columns:repeat(5, 52px); grid-template-rows:repeat(7, 52px); gap:6px;}
  .tile{width:52px; height:52px; font-size:26px;}
}