:root{
  --bg: #071026;
  --card-bg: #081428;
  --panel-border: #0f2b3a;
  --text: #e6eef6;
  --muted: #98a4b3;
  --accent: #4aa3e0;
  --accent-strong: #7ad3b7;
  --mono-bg: #06101a;
  --danger: #e06b6b;
  --radius: 12px;
  --pad: 12px;
  --gap: 12px;
  --max-width: 1200px;
  --font-sans: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Menlo", "Courier New", monospace;
}

/* Home button (left, distinct color) */
.home-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  background: linear-gradient(180deg, #6fc0ff, #4aa3e0);
  color: #022831;
  border-radius:10px;
  font-weight:700;
  text-decoration:none;
  box-shadow: 0 6px 14px rgba(30,120,160,0.12);
  height: var(--btn-h);
  line-height:1;
  border:0;
}
.home-btn:hover{ transform:translateY(-3px); box-shadow:0 10px 20px rgba(30,120,160,0.14) }


*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  background: radial-gradient(900px 300px at 8% 8%, rgba(74,163,224,0.04), transparent 8%),
              linear-gradient(180deg, var(--bg), #041025 120%);
  color:var(--text);
  font-family:var(--font-sans);
  padding:20px;
  display:flex;
  justify-content:center;
  -webkit-font-smoothing:antialiased;
}

.app{
  width:100%;
  max-width:var(--max-width);
  display:flex;
  flex-direction:column;
  gap:16px;
}

/* TOPBAR */
.topbar{
  display:flex;
  flex-direction:row;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:10px;
  border-radius:var(--radius);
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border:1px solid var(--panel-border);
  box-shadow: 0 6px 18px rgba(2,8,20,0.45);
}

/* branding */
.branding h1{
  margin:0;
  font-size:1.05rem;
}
.branding .subtitle{ color:var(--muted); font-size:0.88rem }

/* top controls: responsive wrap */
.top-controls{
  display:flex;
  gap:10px;
  align-items:center;
  flex-wrap:wrap;
  justify-content:flex-end;
}

/* control group */
.control-group{
  display:flex;
  flex-direction:column;
  gap:6px;
  min-width:110px;
}
.control-group label{ color:var(--muted); font-size:0.85rem }
.control-group select,
.control-group input{
  padding:8px 10px;
  border-radius:8px;
  border:1px solid var(--panel-border);
  background:var(--mono-bg);
  color:var(--text);
  min-width:110px;
  font-size:0.92rem;
}

/* smaller groups for compact inputs */
.control-group.mini{ min-width:90px; max-width:160px; }
.control-group.mini input{ min-width:80px }

/* buttons group */
.btn-group { display:flex; gap:8px; align-items:center; margin-left:6px; }
button{
  padding:8px 12px;
  border-radius:8px;
  border:0;
  cursor:pointer;
  font-weight:700;
  font-size:0.92rem;
  color:white;
  background:var(--accent);
}
button.primary{ background: linear-gradient(180deg,var(--accent), #3a8fc0); box-shadow:0 6px 12px rgba(10,50,80,0.25); }
button.ghost{ background:transparent; color:var(--accent); border:1px solid rgba(74,163,224,0.12); box-shadow:none; }

.status { color:var(--muted); font-size:0.9rem; margin-left:6px; }

/* MAIN content: two columns */
.content{
  display:grid;
  grid-template-columns: 1fr 420px;
  gap:var(--gap);
  align-items:start;
}

/* panes */
.pane { padding:var(--pad); border-radius:12px; background:linear-gradient(180deg, rgba(255,255,255,0.01), var(--card-bg)); border:1px solid var(--panel-border); box-shadow:0 6px 18px rgba(0,0,0,0.35); }
.input-pane{ min-height:360px; display:flex; flex-direction:column; gap:8px; }
.output-pane{ min-height:360px; display:flex; flex-direction:column; gap:8px; }

/* pane title */
.pane-title{ font-weight:700; color:var(--accent); margin-bottom:6px; }

/* textarea and output */
.big-textarea{
  width:100%;
  min-height:280px;
  resize:vertical;
  padding:12px;
  border-radius:8px;
  border:1px solid var(--panel-border);
  background:var(--mono-bg);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:0.95rem;
  line-height:1.4;
  outline:none;
}
.output-pre{
  margin:0;
  white-space:pre-wrap;
  font-family:var(--font-mono);
  font-size:0.95rem;
  min-height:280px;
  overflow:auto;
  padding:12px;
  border-radius:8px;
  background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.02));
  border:1px dashed rgba(255,255,255,0.03);
  color:var(--text);
}

/* hints */
.hint{ color:var(--muted); font-size:0.88rem }

/* footer */
.footer{ color:var(--muted); display:flex; justify-content:space-between; font-size:0.9rem }

/* Responsive: collapse columns on small screens */
@media (max-width:980px){
  .content{ grid-template-columns: 1fr; }
  .top-controls{ justify-content:flex-start; }
  .btn-group{ order:10; width:100%; }
  .status{ width:100%; margin-top:6px; }
  .branding{ margin-bottom:6px; }
}