:root{
  --bg:#0f1724;
  --card:#0b1220;
  --muted:#9aa6b2;
  --accent:#7c3aed; /* violet */
  --accent-2:#06b6d4; /* teal */
  --danger:#ef4444;
  --glass: rgba(255,255,255,0.03);
  --glow: 0 8px 30px rgba(124,58,237,0.25);
  --pin-size:46px;
  --pin-font:600 16px/1 "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: dark;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background: radial-gradient(1200px 600px at 10% 10%, rgba(12,18,35,0.6), transparent),
              radial-gradient(1000px 400px at 90% 90%, rgba(6,182,212,0.08), transparent),
              var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color:#e6eef6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  padding:28px;
}

/* App layout */
.nw-app{
  max-width:1200px;
  margin:0 auto;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
  border-radius:14px;
  padding:18px;
  box-shadow: 0 10px 40px rgba(2,6,23,0.6), var(--glow);
  display:flex;
  flex-direction:column;
  gap:12px;
}

/* Header */
.nw-header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}
.nw-title{display:flex;gap:12px;align-items:center}
.nw-icon{font-size:34px;background:linear-gradient(45deg,var(--accent),var(--accent-2));padding:10px;border-radius:10px;box-shadow:0 6px 20px rgba(7,10,25,0.6);display:flex;align-items:center;justify-content:center}
.nw-title h1{margin:0;font-size:20px}
.nw-title .sub{margin:0;color:var(--muted);font-size:13px}

/* Controls */
.nw-controls{display:flex;align-items:center;gap:10px}
.btn{
  background:var(--glass);
  border:1px solid rgba(255,255,255,0.04);
  color:var(--muted);
  padding:8px 12px;border-radius:10px;
  cursor:pointer;font-weight:600;
}
.btn.primary{background:linear-gradient(90deg,var(--accent),var(--accent-2)); color:white; box-shadow:var(--glow)}
.btn.danger{background:linear-gradient(90deg,var(--danger),#ff6b6b); color:white}
.btn:active{transform:translateY(1px)}
select{background:var(--glass); color:var(--muted); border-radius:8px; padding:8px; border:1px solid rgba(255,255,255,0.03)}

/* Main layout */
.nw-main{display:flex;gap:16px}
.nw-sidebar{width:240px;background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent); padding:16px;border-radius:12px;border:1px solid rgba(255,255,255,0.02)}
.nw-board-wrap{flex:1;display:flex;flex-direction:column;gap:12px}
.nw-board{position:relative;height:640px;background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(0,0,0,0.2)); border-radius:12px; overflow:hidden; border:1px solid rgba(255,255,255,0.02)}

/* Canvas - fills board */
#canvas{position:absolute;top:0;left:0;width:100%;height:100%;display:block;}

/* Pins container (numbers) */
.pins{position:absolute;inset:0;pointer-events:none}

/* pin style */
.pin{
  position:absolute;
  width:var(--pin-size);
  height:var(--pin-size);
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 2px solid rgba(255,255,255,0.06);
  color:#dbeafe;
  font:var(--pin-font);
  cursor:pointer;
  transform:translate(-50%,-50%);
  box-shadow: 0 6px 20px rgba(2,6,23,0.6);
  pointer-events:auto;
  user-select:none;
  transition: transform .14s ease, box-shadow .14s ease;
}

/* glowing connected state */
.pin.connected{
  background: linear-gradient(45deg, rgba(124,58,237,1), rgba(6,182,212,1));
  color:white;
  box-shadow: 0 10px 30px rgba(124,58,237,0.28), 0 0 18px rgba(6,182,212,0.12) inset;
  transform:scale(1.05);
}

/* hint style */
.pin.hint{
  box-shadow: 0 8px 30px rgba(124,58,237,0.2);
  animation: pulse 1s infinite;
}
@keyframes pulse{
  0%{transform:translate(-50%,-50%) scale(1)}
  50%{transform:translate(-50%,-50%) scale(1.08)}
  100%{transform:translate(-50%,-50%) scale(1)}
}

/* obstacles */
.obstacle{
  position:absolute;
  border-radius:6px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.35));
  border:1px solid rgba(255,255,255,0.03);
  box-shadow: inset 0 -8px 30px rgba(0,0,0,0.4);
  pointer-events:none;
  opacity:0.95;
}

/* footer/message */
.nw-footer{display:flex;justify-content:space-between;align-items:center;margin-top:6px}
.message{color:var(--muted);font-weight:600}
.action-row{display:flex;gap:8px}

/* responsive */
@media (max-width:980px){
  .nw-main{flex-direction:column}
  .nw-sidebar{width:100%;order:2}
  .nw-board-wrap{order:1}
  .nw-board{height:520px}
}

/* small helpers */
.stat{display:flex;flex-direction:column;padding:8px 0;border-bottom:1px dashed rgba(255,255,255,0.01)}
.stat-label{color:var(--muted);font-size:12px}
.stat-value{font-weight:700;font-size:18px;margin-top:6px}
.tips{margin-top:12px;color:var(--muted);font-size:13px}