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

:root{
  --bg:#05060f;
  --ui-bg:rgba(8,10,24,.75);
  --ui-border:rgba(100,120,255,.25);
  --accent:#7c6fff;
  --accent2:#ff6fbb;
  --text:#c8d0ff;
  --text-dim:#5a6080;
  --radius:12px;
  --btn-h:48px;
}

html,body{
  width:100%;height:100%;overflow:hidden;
  background:var(--bg);
  font-family:'Segoe UI',system-ui,sans-serif;
  color:var(--text);
  -webkit-tap-highlight-color:transparent;
  user-select:none;
}

#canvas{
  display:block;
  position:fixed;
  inset:0;
  width:100%;height:100%;
  cursor:none;
}

/* ── UI overlay ── */
.ui-overlay{
  position:fixed;
  bottom:clamp(20px,4vh,48px);
  left:50%;
  transform:translateX(-50%);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  z-index:10;
  pointer-events:none;
}

.title{
  font-size:clamp(.75rem,2vw,1rem);
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--text-dim);
  pointer-events:none;
}

.controls{
  display:flex;
  gap:10px;
  background:var(--ui-bg);
  border:1px solid var(--ui-border);
  border-radius:calc(var(--radius) + 6px);
  padding:8px;
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  pointer-events:all;
  flex-wrap:wrap;
  justify-content:center;
}

.btn{
  display:flex;
  align-items:center;
  gap:7px;
  height:var(--btn-h);
  padding:0 18px;
  border:1px solid transparent;
  border-radius:var(--radius);
  background:transparent;
  color:var(--text-dim);
  font-size:.82rem;
  font-weight:500;
  letter-spacing:.04em;
  cursor:pointer;
  transition:color .2s,background .2s,border-color .2s,transform .15s;
  white-space:nowrap;
}

.btn:hover{
  color:var(--text);
  background:rgba(124,111,255,.12);
  border-color:rgba(124,111,255,.3);
}

.btn:active{transform:scale(.96)}

.btn.active{
  color:#fff;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent2) 100%);
  border-color:transparent;
  box-shadow:0 0 18px rgba(124,111,255,.45);
}

.btn-icon{font-size:1rem;line-height:1}

.hint{
  font-size:.7rem;
  letter-spacing:.08em;
  color:var(--text-dim);
  pointer-events:none;
}

/* ── Custom cursor ── */
#cursor{
  position:fixed;
  width:20px;height:20px;
  border:2px solid rgba(255,255,255,.7);
  border-radius:50%;
  pointer-events:none;
  transform:translate(-50%,-50%);
  transition:width .15s,height .15s,opacity .2s;
  z-index:999;
  mix-blend-mode:difference;
}
#cursor.hidden{opacity:0}

/* ── Responsive ── */
@media(max-width:480px){
  .btn-label{display:none}
  .btn{padding:0 14px;gap:0}
  .btn-icon{font-size:1.2rem}
  .controls{gap:6px;padding:6px}
  :root{--btn-h:42px}
}

@media(hover:none){
  #cursor{display:none}
}