:root{
  --bg: #0b0f17;
  --card: #121a2a;
  --card2:#0f1726;
  --text: #e6eefc;
  --muted:#9fb0d0;
  --accent:#58a6ff;
  --ok:#22c55e;
  --bad:#ef4444;
  --warn:#f59e0b;
  --line:#1f2a44;
  --shadow: 0 12px 30px rgba(0,0,0,.35);
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  background: radial-gradient(1000px 600px at 20% -10%, rgba(88,166,255,.20), transparent 60%),
              radial-gradient(900px 500px at 90% 0%, rgba(34,197,94,.12), transparent 60%),
              var(--bg);
  color:var(--text);
  font-family: var(--sans);
}

.topbar{
  position: sticky;
  top:0;
  z-index: 10;
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 16px;
  border-bottom:1px solid rgba(255,255,255,.06);
  background: rgba(11,15,23,.8);
  backdrop-filter: blur(10px);
}

.brand{
  display:flex;
  gap:12px;
  align-items:center;
}
.brand .dot{
  width:12px;height:12px;border-radius:50%;
  background: var(--accent);
  box-shadow: 0 0 18px rgba(88,166,255,.7);
}
.title{ font-weight:700; letter-spacing:.2px; }
.subtitle{ font-size:12px; color:var(--muted); margin-top:2px; }

.controls{
  display:flex;
  gap:10px;
  align-items:center;
}
.status{
  display:flex;
  gap:8px;
  align-items:center;
  margin-right:6px;
}
.pill{
  font-size:12px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
}
.muted{ color:var(--muted); font-size:12px; }

button{
  border:1px solid rgba(255,255,255,.14);
  background: rgba(88,166,255,.14);
  color:var(--text);
  padding:8px 12px;
  border-radius:10px;
  cursor:pointer;
  transition: transform .05s ease, background .2s ease;
}
button:hover{ background: rgba(88,166,255,.20); }
button:active{ transform: translateY(1px); }
button.secondary{
  background: rgba(255,255,255,.06);
}
button.secondary:hover{ background: rgba(255,255,255,.10); }
button:disabled{
  opacity:.55;
  cursor:not-allowed;
}

.grid{
  display:grid;
  grid-template-columns: 1.2fr 1fr;
  grid-template-rows: 420px 1fr;
  gap:14px;
  padding:14px;
}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));
  border:1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow:hidden;
  min-height: 0;
}

.cardHeader{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px 12px;
  border-bottom:1px solid rgba(255,255,255,.06);
  background: rgba(0,0,0,.15);
}
.cardTitle{ font-weight:700; }
.cardActions{ display:flex; gap:8px; }

.editor{
  display:flex;
  flex-direction:column;
}
textarea{
  width:100%;
  height:100%;
  padding:12px;
  background: rgba(0,0,0,.22);
  color:var(--text);
  border:0;
  outline:none;
  resize:none;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.35;
}
.hint{
  padding:10px 12px;
  border-top:1px solid rgba(255,255,255,.06);
  color:var(--muted);
  font-size:12px;
  background: rgba(0,0,0,.12);
}
.hint.small{ font-size:11px; }

.io .outputs{
  padding:12px;
  display:flex;
  flex-direction:column;
  gap:14px;
}
.blockTitle{
  font-size:12px;
  color:var(--muted);
  margin-bottom:8px;
}

.ledRow{
  display:grid;
  grid-template-columns: repeat(16, 1fr);
  gap:6px;
}
.led{
  width: 100%;
  aspect-ratio: 1/1;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.08);
  box-shadow: inset 0 0 0 2px rgba(0,0,0,.18);
}
.led.on{
  background: rgba(34,197,94,.70);
  border-color: rgba(34,197,94,.9);
  box-shadow: 0 0 14px rgba(34,197,94,.45);
}
.bitLabelRow{
  display:grid;
  grid-template-columns: repeat(16, 1fr);
  gap:6px;
  margin-top:6px;
  color: var(--muted);
  font-size: 10px;
  font-family: var(--mono);
  opacity: .85;
}
.bitLabelRow span{
  text-align:center;
}

.hexRow{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  align-items:center;
}

/* 7-seg display */
.sevenSeg{
  width: 90px;
  height: 140px;
  position: relative;
  background: rgba(0,0,0,.18);
  border:1px solid rgba(255,255,255,.10);
  border-radius: 14px;
  padding:10px;
}
.seg{
  position:absolute;
  background: rgba(255,255,255,.10);
  border-radius: 8px;
  filter: drop-shadow(0 0 0 rgba(0,0,0,0));
}
.seg.on{
  background: rgba(88,166,255,.75);
  filter: drop-shadow(0 0 8px rgba(88,166,255,.35));
}

/* segment positions */
.seg.a{ top:10px; left:18px; width:54px; height:12px; }
.seg.d{ bottom:10px; left:18px; width:54px; height:12px; }
.seg.g{ top:64px; left:18px; width:54px; height:12px; }

.seg.f{ top:18px; left:10px; width:12px; height:54px; }
.seg.b{ top:18px; right:10px; width:12px; height:54px; }

.seg.e{ bottom:18px; left:10px; width:12px; height:54px; }
.seg.c{ bottom:18px; right:10px; width:12px; height:54px; }

.seg.dp{
  width:12px; height:12px;
  bottom:10px; right:10px;
  border-radius: 999px;
}

.digitLabel{
  margin-top:8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  text-align:center;
}

.inputs{
  grid-column: 1 / 2;
  display:flex;
  flex-direction:column;
  min-height: 0;
}
.twoCols{
  padding:12px;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:12px;
  min-height: 0;
}
.ioGrid{
  display:grid;
  grid-template-columns: repeat(8, 1fr);
  gap:8px;
}
.ioCell{
  display:flex;
  flex-direction:column;
  gap:6px;
  align-items:center;
  padding:8px 6px;
  background: rgba(0,0,0,.16);
  border:1px solid rgba(255,255,255,.08);
  border-radius:12px;
}
.ioCell label{
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
}

.toggle{
  width: 38px;
  height: 22px;
  border-radius: 999px;
  position: relative;
  background: rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.14);
  cursor:pointer;
}
.toggle::after{
  content:"";
  width: 16px;
  height: 16px;
  position:absolute;
  top:2px;
  left:2px;
  border-radius: 999px;
  background: rgba(255,255,255,.45);
  transition: left .12s ease, background .12s ease;
}
.toggle.on{
  background: rgba(34,197,94,.24);
  border-color: rgba(34,197,94,.55);
}
.toggle.on::after{
  left: 20px;
  background: rgba(34,197,94,.75);
}

.momentary{
  width: 40px;
  height: 28px;
  border-radius: 10px;
  border:1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.08);
  cursor:pointer;
}
.momentary.down{
  background: rgba(245,158,11,.25);
  border-color: rgba(245,158,11,.55);
  box-shadow: 0 0 12px rgba(245,158,11,.18);
}

.logs{
  grid-column: 2 / 3;
  display:flex;
  flex-direction:column;
  min-height: 0;
}
.logView{
  margin:0;
  padding:12px;
  height:100%;
  overflow:auto;
  background: rgba(0,0,0,.22);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.35;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Responsive */
@media (max-width: 1100px){
  .grid{
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
  .inputs, .logs{
    grid-column: auto;
  }
  .twoCols{
    grid-template-columns: 1fr;
  }
}

/* Editor w/ line numbers */
.editorWrap{
  display:flex;
  width:100%;
  height:100%;
  min-height: 0;
  background: rgba(0,0,0,.22);
}

.lineGutter{
  margin:0;
  padding:12px 10px 12px 12px;
  width: 54px;                /* gutter width */
  overflow:hidden;
  user-select:none;
  text-align:right;
  color: rgba(159,176,208,.85);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.35;
  border-right: 1px solid rgba(255,255,255,.06);
  background: rgba(0,0,0,.10);
}

#lineGutter .ln { display:block; }

textarea#vhdlEditor{
  overscroll-behavior-y: none;
  flex:1;
  height:100%;
  padding:12px;
  background: transparent; /* uses editorWrap background */
  color:var(--text);
  border:0;
  outline:none;
  resize:none;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.35;
  overflow:auto;
}