:root{
  --bg:#030b0f;
  --panel:rgba(7,18,40,.86);
  --text:#e7f6ff;
  --muted:rgba(255,255,255,.72);
  --border:rgba(255,255,255,.12);
  --accent:#7fd8ff;
  --accent2:#68f0ff;
  --good:#8affa8;
  --bad:#ff5d7a;
  --radius:18px;
  --radius2:22px;
}

*{box-sizing:border-box}
html{color-scheme:dark}
body{
  margin:0;
  min-height:100vh;
  background:
    radial-gradient(circle at 20% 10%, rgba(48,135,220,.22), transparent 50%),
    radial-gradient(circle at 80% 0%, rgba(120,203,255,.12), transparent 45%),
    linear-gradient(180deg, rgba(10,25,50,.55), transparent 42%),
    var(--bg);
  color:var(--text);
    font-family:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

.shell{
  width:min(1100px, 92vw);
  margin:0 auto;
  padding:clamp(1.25rem, 3vw, 2.25rem) 0 2.25rem;
}

.topbar{
  display:flex;
  justify-content:space-between;
  gap:1.25rem;
  align-items:flex-end;
  padding:1.25rem 1.25rem;
  border-radius:var(--radius2);
  border:1px solid var(--border);
  background:rgba(3,10,18,.75);
  backdrop-filter: blur(16px);
  box-shadow:0 22px 60px rgba(1,4,16,.65);
}

h1{
  margin:0;
  letter-spacing:.02em;
  font-size:clamp(1.7rem, 3.2vw, 2.35rem);
}

.sub{
  margin:.35rem 0 0;
  color:rgba(255,255,255,.78);
  max-width:55ch;
}

.meta{
  display:flex;
  gap:.75rem;
  flex-wrap:wrap;
  justify-content:flex-end;
}

.stat{
  padding:.55rem .8rem;
  border:1px solid rgba(255,255,255,.1);
  border-radius:999px;
  background:rgba(255,255,255,.06);
  letter-spacing:.12em;
  font-size:.8rem;
  color:rgba(255,255,255,.86);
}

.stage{
  position:relative;
  margin-top:1.25rem;
  border-radius:var(--radius2);
  overflow:hidden;
  border:1px solid rgba(255,255,255,.12);
  background:linear-gradient(145deg, rgba(255,255,255,.08), rgba(5,20,30,.85));
  box-shadow:0 22px 70px rgba(1,4,16,.72);
}

#game{
  width:100%;
  height:min(70vh, 620px);
  display:block;
}

.overlay{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:1.25rem;
  background:radial-gradient(circle at 30% 20%, rgba(104,240,255,.16), transparent 55%), rgba(0,0,0,.46);
}

/* Ensure the HTML `hidden` attribute actually hides overlays.
   Author styles override the UA stylesheet, so we must handle it explicitly. */
.overlay[hidden]{
  display:none;
}

.panel{
  width:min(560px, 100%);
  border-radius:var(--radius2);
  background:rgba(4,10,28,.82);
  border:1px solid rgba(255,255,255,.14);
  padding:1.35rem 1.35rem 1.15rem;
  box-shadow:0 30px 70px rgba(0,0,0,.55);
  backdrop-filter: blur(18px);
}

  /* Leaderboard */
  .leaderboard{
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,.10);
  }

  .lb-head{display:flex;align-items:flex-end;justify-content:space-between;gap:.75rem}
  .lb-title{font-weight:950;letter-spacing:.02em}
  .lb-sub{color:rgba(255,255,255,.70);font-size:.9rem}

  .lb-list{
    margin:.75rem 0 0;
    padding-left: 1.25rem;
    display:grid;
    gap:.35rem;
    max-height: 180px;
    overflow:auto;
  }

  .lb-list li{
    display:flex;
    justify-content:space-between;
    gap:1rem;
    padding:.35rem .45rem;
    border-radius: 10px;
    background: rgba(255,255,255,.04);
    border: 1px solid rgba(255,255,255,.08);
  }

  .lb-name{font-weight:900}
  .lb-score{font-weight:900;color:rgba(154,230,255,.92)}

  .lb-form{
    margin-top:.75rem;
    display:grid;
    grid-template-columns: 1fr auto;
    gap:.55rem;
    align-items:center;
  }

  .lb-label{grid-column:1 / -1;color:rgba(255,255,255,.70);font-weight:800;font-size:.85rem}

  .lb-input{
    width:100%;
    padding:.65rem .75rem;
    border-radius: 12px;
    border:1px solid rgba(255,255,255,.14);
    background: rgba(0,0,0,.18);
    color: rgba(255,255,255,.92);
    font-weight:800;
  }

  .lb-status{margin-top:.45rem;color:rgba(255,255,255,.72);min-height:1.2em}
  .lb-note{margin-top:.35rem;color:rgba(255,255,255,.55);font-size:.82rem}

.kicker{
  margin:0;
  color:var(--accent2);
  text-transform:uppercase;
  letter-spacing:.28em;
  font-size:.75rem;
}

.panel h2{
  margin:.6rem 0 .4rem;
  letter-spacing:.14em;
  font-size:1.7rem;
}

.copy{
  margin:0;
  color:rgba(255,255,255,.8);
  line-height:1.6;
}

.actions{
  margin-top:1rem;
  display:flex;
  gap:.75rem;
  flex-wrap:wrap;
}

.primary,
.ghost{
  border-radius:999px;
  padding:.85rem 1.1rem;
  font-weight:700;
  letter-spacing:.10em;
  text-transform:uppercase;
  border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.06);
  color:var(--text);
  text-decoration:none;
  cursor:pointer;
  transition: background .20s ease, box-shadow .20s ease, border-color .20s ease;
}

.primary{
  background:linear-gradient(145deg, #1a3b92, #0057b8 70%);
  border-color:rgba(173,216,255,.35);
}

.primary:hover,
.primary:focus-visible,
.ghost:hover,
.ghost:focus-visible{
  box-shadow:0 14px 40px rgba(0,0,0,.42);
  border-color:rgba(127,216,255,.7);
  background:rgba(255,255,255,.075);
}

.hint{
  margin-top:.85rem;
  color:rgba(255,255,255,.62);
  font-size:.85rem;
}

.mobile{
  position:absolute;
  left:14px;
  bottom:14px;
  display:grid;
  gap:.5rem;
  opacity:.92;
}

.mobile .row{display:flex; gap:.5rem;}

.pad{
  width:46px;
  height:46px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.08);
  color:rgba(255,255,255,.9);
  cursor:pointer;
}

.lower{
  position:absolute;
  right:14px;
  bottom:14px;
  display:flex;
  gap:.6rem;
}

.mini{
  border-radius:14px;
  border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.08);
  color:rgba(255,255,255,.9);
  padding:.6rem .8rem;
  cursor:pointer;
  letter-spacing:.18em;
  text-transform:uppercase;
  font-weight:700;
  font-size:.75rem;
}

.footer{
  margin-top:1rem;
  display:flex;
  gap:.65rem;
  align-items:center;
  justify-content:space-between;
  color:rgba(255,255,255,.7);
}

.footer a{color:var(--accent); text-decoration:none; border-bottom:1px solid transparent;}
.footer a:hover,.footer a:focus-visible{border-color:var(--accent)}

.credit{opacity:.85}

@media (max-width: 720px){
  .topbar{flex-direction:column; align-items:flex-start}
  .meta{justify-content:flex-start}
  .mobile{transform:scale(.95)}
}

@media (prefers-reduced-motion: reduce){
  .primary,.ghost{transition:none}
}