/* HexLife main styles (extracted from inline CSS)
   Place this file at: styles/main.css  */

:root {
  --bg:#0f1115; --panel:#151923; --text:#e6e7ea; --muted:#9aa0aa;
  --accent:#4f8cff; --border:#2a3040; --ok:#27ae60; --warn:#e2b93d; --err:#e35d6a;
}
:root.light {
  --bg:#f6f7fb; --panel:#ffffff; --text:#1e2026; --muted:#666c77;
  --accent:#2b65ff; --border:#dfe3ee; --ok:#1f9e55; --warn:#c79d2f; --err:#cf4d5a;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--text);
  font:14px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,
       "Noto Sans","Liberation Sans",sans-serif;
}

/* Layout */
.wrap{min-height:100%;display:grid;grid-template-rows:auto 1fr auto}
header{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--panel)}
.title{font-weight:600;letter-spacing:.2px}
.header-actions{display:flex;gap:8px;align-items:center}

/* Buttons & segments (refined to remove dead zones) */
.btn{appearance:none;border:1px solid var(--border);background:transparent;color:var(--text);padding:8px 10px;border-radius:10px;cursor:pointer}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}

/* Segmented containers: fill 100% area, no gaps inside */
.seg, #toolSeg, #simSeg{
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:1fr;
  gap:0;                 /* no dead space between buttons */
  padding:0;             /* no inner padding that could eat clicks */
  border:1px solid var(--border);
  border-radius:10px;
  overflow:hidden;       /* clip rounded corners */
  background:transparent;
}

/* Segment buttons occupy full cells */
.seg > button,
#toolSeg > button,
#simSeg  > button{
  width:100%;
  height:100%;
  margin:0;
  border:0;
  background:transparent;
  color:var(--text);
  padding:8px 10px;
  line-height:1.2;
  cursor:pointer;
}

/* Visual dividers between buttons (no extra gap) */
.seg > button + button,
#toolSeg > button + button,
#simSeg  > button + button{
  border-left:1px solid var(--border);
}

/* Round the outer corners only (container clips the rest) */
.seg > button:first-child,
#toolSeg > button:first-child,
#simSeg  > button:first-child{
  border-top-left-radius:10px; border-bottom-left-radius:10px;
}
.seg > button:last-child,
#toolSeg > button:last-child,
#simSeg  > button:last-child{
  border-top-right-radius:10px; border-bottom-right-radius:10px;
}

/* Active/hover states */
.seg > button.active,
#toolSeg > button.active,
#simSeg  > button.active{ background:var(--accent); color:#fff }
.seg > button:hover,
#toolSeg > button:hover,
#simSeg  > button:hover{ background:color-mix(in oklab, var(--accent) 18%, transparent) }

/* Main content */
main{display:grid;grid-template-columns:1fr 360px;gap:16px;padding:16px}
.canvas-wrap{background:var(--panel);border:1px solid var(--border);border-radius:12px;position:relative;overflow:hidden;min-height:400px}
canvas{display:block;width:100%;height:100%}

/* Sidebar */
aside{display:grid;gap:12px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:12px}
.card h3{font-size:13px;margin:0 0 8px;color:var(--muted);letter-spacing:.4px;text-transform:uppercase}
.row{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}
.row-3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:8px}
label{display:grid;gap:4px;font-size:12px;color:var(--muted)}
input[type="number"], input[type="text"], select{width:100%;padding:8px 10px;border-radius:10px;border:1px solid var(--border);background:transparent;color:var(--text)}
input[type="range"]{width:100%}
.chipset{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.chip{padding:6px 8px;border:1px solid var(--border);border-radius:999px;cursor:pointer;font-size:12px}
.chip.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.grid{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}
.muted{color:var(--muted)}
.mini{font-size:12px}

/* Footer */
footer{border-top:1px solid var(--border);background:var(--panel);padding:8px 12px;display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}
.status{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.counters{display:flex;gap:12px;color:var(--muted)}

@media (max-width:1100px){
  main{grid-template-columns:1fr}
}