:root{
  --bg:#0b0f14;
  --panel:#111826;
  --panel2:#0f172a;
  --border:#223044;
  --text:#e6edf7;
  --muted:#a8b3c7;
  --accent:#4ea0ff;
  --danger:#ff6b6b;
  --cell:#0b1220;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:16px;
  padding:16px 18px;
  border-bottom:1px solid var(--border);
  background:linear-gradient(180deg,var(--panel),var(--panel2));
  position:sticky;
  top:0;
  z-index:10;
}

.topbar__title{font-weight:700;font-size:18px;line-height:1.2}
.topbar__subtitle{margin-top:4px;color:var(--muted);font-size:12px;max-width:60ch}

.topbar__right{display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:flex-end}

.btn{
  background:var(--accent);
  color:#03101e;
  border:0;
  padding:10px 12px;
  border-radius:10px;
  font-weight:700;
  cursor:pointer;
}
.btn:disabled{opacity:.6;cursor:not-allowed}

.toggle{display:flex;gap:10px;align-items:center;color:var(--muted);font-size:12px;user-select:none}
.toggle input{transform:scale(1.1)}

.layout{
  display:grid;
  grid-template-columns:340px 1fr;
  gap:0;
  height:calc(100% - 64px);
}

.sidebar{
  border-right:1px solid var(--border);
  background:var(--panel2);
  padding:14px 12px;
  overflow:auto;
}

.sidebar__section{padding:10px;border:1px solid var(--border);border-radius:12px;background:rgba(0,0,0,0.15)}
.sidebar__section + .sidebar__section{margin-top:12px}
.sidebar__label{color:var(--muted);font-size:12px;margin-bottom:10px}

.tabs{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}
.tab{
  width:100%;
  text-align:left;
  padding:10px 10px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--cell);
  color:var(--text);
  cursor:pointer;
}
.tab[aria-selected="true"]{border-color:var(--accent);box-shadow:0 0 0 1px rgba(78,160,255,.25) inset}
.tab small{color:var(--muted)}

.kv{display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;align-items:center;margin:8px 0}
.kv__k{color:var(--muted);font-size:12px}
.kv__v{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;font-size:12px}

.note{color:var(--muted);font-size:12px;margin-top:10px}
.note.error{color:var(--danger)}

.content{
  padding:16px 18px;
  overflow:hidden;
}

.sheetHeader{display:flex;justify-content:space-between;gap:16px;align-items:baseline;margin-bottom:10px}
.sheetHeader__title{margin:0;font-size:16px}
.sheetHeader__hint{color:var(--muted);font-size:12px}

.gridWrap{
  border:1px solid var(--border);
  border-radius:12px;
  overflow:auto;
  height:calc(100% - 40px);
  background:var(--cell);
}

.grid{
  border-collapse:separate;
  border-spacing:0;
  width:max-content;
  min-width:100%;
}

.grid th,.grid td{
  border-right:1px solid var(--border);
  border-bottom:1px solid var(--border);
  padding:6px 8px;
  vertical-align:middle;
  font-size:12px;
}

.grid thead th{
  position:sticky;
  top:0;
  z-index:2;
  background:rgba(17,24,38,0.95);
  color:var(--muted);
  font-weight:600;
  text-align:center;
}

.grid th.rowhdr{
  position:sticky;
  left:0;
  z-index:3;
  background:rgba(17,24,38,0.95);
  color:var(--muted);
  text-align:right;
  min-width:44px;
}

.grid td{
  min-width:120px;
  max-width:340px;
  background:rgba(0,0,0,0.12);
}

.cellText{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cellMono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}

.cellInput{
  width:100%;
  border:1px solid rgba(255,255,255,.08);
  background:rgba(0,0,0,0.25);
  color:var(--text);
  border-radius:8px;
  padding:6px 8px;
  font-size:12px;
}
.cellInput:focus{outline:2px solid rgba(78,160,255,.35);border-color:rgba(78,160,255,.55)}

.badge{
  display:inline-block;
  padding:2px 6px;
  border-radius:999px;
  background:rgba(78,160,255,.12);
  color:var(--accent);
  font-size:11px;
  border:1px solid rgba(78,160,255,.25);
}