:root {
  --bg: #0b0f14;
  --panel: #0f141b;
  --panel-2: #121923;
  --text: #e6edf3;
  --muted: #9aa7b2;
  --accent: #67e8f9;
  --border: #1f2a37;
  --danger: #ff6b6b;
  --ok: #22c55e;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; font-family: ui-sans-serif, system-ui, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background: radial-gradient(1200px 600px at 80% -10%, #122032 0%, var(--bg) 55%);
}
.app { display: flex; height: 100vh; }
.sidebar {
  width: 280px; min-width: 240px;
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.sidebar header { padding: 16px 16px 8px; border-bottom: 1px solid var(--border); }
.title { font-weight: 700; letter-spacing: .3px; font-size: 16px; }
.subtitle { color: var(--muted); font-size: 12px; margin-top: 6px; }
.filelist { padding: 8px; overflow: auto; flex: 1; }
.file {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; margin: 8px 4px;
  border: 1px solid var(--border); background: #0e1621;
  border-radius: 12px; cursor: pointer; transition: all .15s ease;
}
.file:hover { border-color: #2b3a4a; transform: translateY(-1px); }
.file.active { outline: 2px solid rgba(103, 232, 249, .35); background: #0c1924; }
.file .name { font-size: 13px; }
.file .meta { margin-left: auto; color: var(--muted); font-size: 11px; }
.right { flex: 1; display: flex; flex-direction: column; }
.toolbar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-bottom: 1px solid var(--border);
  background: rgba(10,15,20, .6); backdrop-filter: blur(6px);
  position: sticky; top: 0; z-index: 2;
}
.tag { font-size: 12px; padding: 6px 10px; border-radius: 999px;
       border: 1px solid var(--border); color: var(--muted); }
.spacer { flex: 1; }
.btn {
  appearance: none; border: 1px solid var(--border);
  background: #0c151f; color: var(--text);
  padding: 8px 12px; border-radius: 12px; font-size: 13px;
  cursor: pointer; transition: all .15s ease;
}
.btn:hover { border-color: #314356; transform: translateY(-1px); }
.btn.accent { border-color: rgba(103,232,249,.4);
              box-shadow: inset 0 0 0 1px rgba(103,232,249,.15); }
.status {
  font-size: 12px; padding: 6px 10px; border-radius: 999px;
  border: 1px solid var(--border); display: inline-flex;
  align-items: center; gap: 8px;
}
.dot { width: 8px; height: 8px; border-radius: 999px; display: inline-block; }
.dot.ok { background: var(--ok); }
.dot.err { background: var(--danger); }
#editor { flex: 1; min-height: 0; }
.footer {
  padding: 8px 12px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 12px; display: flex;
  gap: 8px; align-items: center;
}
@media (max-width: 900px) { .sidebar { width: 220px; } }