:root{
  --bg1: #071028;
  --bg2: #08122a;
  --glass: rgba(255,255,255,0.06);
  --glass-2: rgba(255,255,255,0.03);
  --accent: #6ef0c7;
  --accent-2: #7b6eff;
  --text: #e9f2ff;
  --muted: rgba(233,242,255,0.6);
  --success: #b7ff9e;
  --danger: #ff9e9e;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
html,body,#gameCanvas{height:100%}
body{
  margin:0;
  background: linear-gradient(180deg,var(--bg1), var(--bg2));
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  min-height:100vh;
  align-items:center;
  justify-content:center;
  padding:28px;
}

/* App container */
.app{
  width:min(1200px,96vw);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.0));
  border-radius:14px;
  box-shadow: 0 8px 30px rgba(2,6,23,0.7);
  overflow:hidden;
  display:flex;
  flex-direction:column;
}

/* Top bar */
.topbar{
  display:flex;
  justify-content:space-between;
  padding:18px 22px;
  align-items:center;
  gap:12px;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}
.title{display:flex;align-items:center;gap:14px}
.title .emoji{font-size:34px}
.title h1{margin:0;font-size:20px}
.title .sub{margin:0;color:var(--muted);font-size:13px}

/* Controls */
.controls{display:flex;align-items:center;gap:12px}
.btn{
  background:var(--glass);
  color:var(--text);
  border:1px solid rgba(255,255,255,0.04);
  padding:8px 12px;
  border-radius:8px;
  cursor:pointer;
  font-weight:600;
  font-size:14px;
}
.btn.primary{
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color:#06101a;
  border:none;
  box-shadow: 0 6px 18px rgba(107,68,255,0.14), inset 0 -2px 6px rgba(255,255,255,0.03);
}
.meta{color:var(--muted);display:flex;gap:12px;font-size:13px;align-items:center}

/* Main layout */
.game-area{
  display:grid;
  grid-template-columns: 1fr 320px;
  gap:18px;
  padding:18px;
  align-items:stretch;
}

/* Canvas */
#gameCanvas{
  width:100%;
  height:640px;
  display:block;
  border-radius:10px;
  background: radial-gradient(1200px 600px at 10% 30%, rgba(120,80,255,0.08), transparent 10%),
              radial-gradient(900px 400px at 90% 70%, rgba(120,255,190,0.04), transparent 8%),
              linear-gradient(180deg, rgba(6,10,25,0.85), rgba(6,10,25,0.6));
  box-shadow: 0 12px 40px rgba(3,8,23,0.7), inset 0 1px 0 rgba(255,255,255,0.02);
  position:relative;
}

/* HUD panels on the right */
.hud{
  padding:6px 10px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.panel{
  background: linear-gradient(180deg,var(--glass), var(--glass-2));
  border-radius:10px;
  padding:12px;
  border:1px solid rgba(255,255,255,0.03);
}
.panel h3{margin:0 0 8px 0;font-size:14px}
.bar-wrap{
  width:100%;
  height:14px;
  background:rgba(255,255,255,0.03);
  border-radius:8px;
  overflow:hidden;
}
.bar{
  height:100%;
  width:0%;
  background: linear-gradient(90deg, #6ef0c7, #7b6eff);
  box-shadow: 0 6px 20px rgba(100,150,255,0.12);
  transition:width 300ms ease;
}

/* rules & tips */
.rules ul, .tips ol{padding-left:18px;margin:0;color:var(--muted);font-size:13px}
.rules li{margin:6px 0}

/* Footer */
.footer{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px 18px;
  font-size:13px;
  color:var(--muted);
  border-top:1px solid rgba(255,255,255,0.02);
}
.back-link{color:var(--muted);text-decoration:none}

/* overlay */
.overlay{
  position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(2,6,23,0.6);backdrop-filter: blur(5px);
}
.overlay.hidden{display:none}
.overlay-card{
  background:linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  color:var(--text);
  border-radius:12px;padding:22px;width:min(520px,92%);text-align:center;
  box-shadow:0 12px 40px rgba(2,6,23,0.7);
}
.overlay-actions{display:flex;gap:12px;justify-content:center;margin-top:14px}
kbd{background:rgba(255,255,255,0.04);padding:4px 6px;border-radius:6px;font-weight:600}
@media (max-width:980px){
  .game-area{grid-template-columns:1fr;grid-auto-rows:auto}
  #gameCanvas{height:520px}
  .hud{order:2}
}