/* Cyberpunk Neon Snake styles */
:root{
  --bg:#05060a;
  --grid:#0a0c12;
  --neon-cyan:#0ff;
  --neon-pink:#ff2bd6;
  --neon-purple:#8a2be2;
  --neon-yellow:#ffe066;
  --text:#e6f7ff;
  --muted:#7b89a1;
  --good:#65ff8f;
  --bad:#ff6b6b;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  color:var(--text);
  background:
    radial-gradient(1200px 1200px at 80% -10%, rgba(255,43,214,.12), transparent 60%),
    radial-gradient(900px 900px at 10% 110%, rgba(0,255,255,.10), transparent 60%),
    linear-gradient(180deg, #06070d 0%, #03040a 100%);
  font-family:"Oxanium","Orbitron","Share Tech Mono",ui-monospace,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  letter-spacing:.02em;
}

.page-wrap{
  min-height:100%;
  display:flex;
  flex-direction:column;
}

.app-header{
  padding:18px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.brand .logo{
  margin:0;
  line-height:1;
  font-family:"Orbitron",sans-serif;
  font-weight:800;
  font-size:28px;
  letter-spacing:.2em;
  text-transform:uppercase;
  display:flex;
  gap:.6ch;
}
.logo-main{color:var(--neon-cyan);text-shadow:0 0 12px rgba(0,255,255,.85),0 0 30px rgba(0,255,255,.25)}
.logo-accent{color:var(--neon-pink);text-shadow:0 0 12px rgba(255,43,214,.85),0 0 30px rgba(255,43,214,.25)}
.brand .sub{color:var(--muted);font-size:12px;margin-top:6px}

.stage{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:6px 16px 18px;
}

.hud{
  width:100%;
  max-width:960px;
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:10px;
}
.hud-item{
  background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01));
  border:1px solid rgba(0,255,255,.18);
  border-left-color:rgba(255,43,214,.25);
  padding:10px 12px;
  border-radius:10px;
  display:flex;align-items:center;justify-content:space-between;
  box-shadow:0 0 0 1px rgba(0,0,0,.35) inset, 0 0 18px rgba(0,255,255,.08);
}
.hud .label{font:600 12px/1 "Orbitron";letter-spacing:.18em;color:var(--muted)}
.hud .value{font:700 18px/1 "Share Tech Mono";color:var(--text);text-shadow:0 0 10px rgba(0,255,255,.25)}

.canvas-wrap{
  position:relative;
  width:100%;
  max-width: min(960px, calc(100vh - 300px));
  aspect-ratio:1/1;
  background:
    linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.02)),
    repeating-linear-gradient(0deg, var(--grid) 0 16px, transparent 16px 32px),
    repeating-linear-gradient(90deg, var(--grid) 0 16px, transparent 16px 32px);
  border:1px solid rgba(0,255,255,.25);
  border-radius:16px;
  box-shadow:0 0 0 1px rgba(0,0,0,.5) inset, 0 0 40px rgba(0,255,255,.08), 0 0 60px rgba(255,43,214,.06);
  overflow:hidden;
}
#game{display:block;width:100%;height:100%}

.overlay{
  position:absolute;inset:0;
  display:grid;place-items:center;
  background:radial-gradient(400px 400px at 50% 40%, rgba(0,255,255,.08), transparent 75%);
  pointer-events:none;
}
.overlay-inner{ text-align:center; }
.overlay .title{
  font:800 32px/1 "Orbitron";
  letter-spacing:.25em; text-transform:uppercase;
  color:var(--neon-cyan);
  text-shadow:0 0 14px rgba(0,255,255,.9),0 0 42px rgba(0,255,255,.35);
}
.overlay .hint{margin-top:10px;color:var(--muted);font:400 13px/1.4 "Oxanium"}

.controls{display:flex;gap:10px}
.btn{
  padding:10px 14px; border-radius:12px;
  border:1px solid rgba(255,255,255,.18);
  background:linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.02));
  color:var(--text);
  font:700 13px/1 "Oxanium";
  letter-spacing:.16em; text-transform:uppercase;
  transition:.2s ease; cursor:pointer;
}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(0,0,0,.35),0 0 22px rgba(255,255,255,.06)}
.btn.neon{border-color:rgba(0,255,255,.35); box-shadow:0 0 18px rgba(0,255,255,.12) inset,0 0 24px rgba(0,255,255,.08)}

.mobile-controls{display:none}
@media (max-width: 840px){
  .hud{grid-template-columns:1fr 1fr 1fr}
  .overlay .title{font-size:26px}
  .mobile-controls{display:block;width:100%;max-width:960px}
  .mobile-controls .pad{margin:8px auto 0;display:grid;grid-template-rows:auto auto auto;gap:8px;place-items:center}
  .dpad{width:64px;height:48px;border-radius:12px;border:1px solid rgba(0,255,255,.25);background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));color:var(--text);font:700 18px/1 "Orbitron"}
  .mid{display:flex;gap:12px}
}

/* 小筆電螢幕自適應 (高度 <= 820px) */
@media (max-height: 820px){
  .app-header{padding:8px 20px}
  .brand .logo{font-size:22px}
  .brand .sub{margin-top:3px;font-size:11px}
  .stage{gap:8px;padding:4px 16px 8px}
  .hud-item{padding:7px 10px}
  .hud .label{font-size:10px}
  .hud .value{font-size:15px}
  .overlay .title{font-size:24px}
  .controls{gap:8px}
  .btn{padding:8px 12px;font-size:12px}
  .app-footer{padding:6px 16px}
  .kbd{font-size:11px;gap:12px}
}

/* 更小螢幕 (高度 <= 660px) */
@media (max-height: 660px){
  .app-header{padding:5px 16px}
  .brand .logo{font-size:17px}
  .brand .sub{display:none}
  .stage{gap:5px;padding:2px 16px 5px}
  .hud-item{padding:5px 8px}
  .hud .value{font-size:13px}
  .overlay .title{font-size:18px}
  .overlay .hint{font-size:11px}
  .btn{padding:6px 10px;font-size:11px}
  .app-footer{padding:4px 16px}
}

.app-footer{padding:12px 16px;color:var(--muted);display:flex;justify-content:center}
.kbd{display:flex;gap:18px;font:400 12px/1.6 "Share Tech Mono"}

/* Glow helpers */
.glow-cyan{filter:drop-shadow(0 0 12px rgba(0,255,255,.85))}
.glow-pink{filter:drop-shadow(0 0 12px rgba(255,43,214,.85))}