:root {
  --bg: #0b0d11;
  --panel: #141820;
  --line: rgba(255,255,255,.08);
  --text: #e8eef7;
  --muted: #8b97a8;
  --accent: #3dffa8;
  --bad: #ff5c5c;
  --font: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-family: var(--font); }
.login-body { display: grid; place-items: center; min-height: 100%; background: radial-gradient(1200px 600px at 20% -10%, #1a2433, var(--bg)); }
.login-card { width: min(360px, 92vw); background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 22px; display: flex; flex-direction: column; gap: 12px; }
.login-card label { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--muted); }
.login-card input, textarea, button, select { font: inherit; }
.login-card input, textarea { background: #0d1118; border: 1px solid var(--line); border-radius: 10px; color: var(--text); padding: 10px 12px; }
.login-card button, .row-actions button, .top-actions button, .preview-bar button { border: 1px solid var(--line); background: #10151d; color: var(--text); border-radius: 10px; padding: 9px 12px; cursor: pointer; }
.login-card button:hover, .row-actions button:hover, .primary { border-color: var(--accent); color: var(--accent); }
.brand { font-weight: 800; letter-spacing: .04em; }
.brand span { color: var(--accent); }
.muted { color: var(--muted); font-size: 12px; }
.err { color: var(--bad); font-size: 13px; }
.shell { height: 100%; display: flex; flex-direction: column; }
.top { display: flex; align-items: center; gap: 14px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: #0e1218; }
.tabs { display: flex; gap: 6px; flex: 1; }
.tabs button { border: 1px solid transparent; background: transparent; color: var(--muted); border-radius: 999px; padding: 6px 12px; cursor: pointer; }
.tabs button.active { color: var(--accent); border-color: var(--accent); background: rgba(61,255,168,.06); }
.top-actions { display: flex; align-items: center; gap: 10px; }
.main { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(300px, 380px) 1fr; }
.panel { border-right: 1px solid var(--line); overflow: auto; padding: 12px; display: flex; flex-direction: column; gap: 14px; background: #0f1319; }
.panel-head { display: flex; justify-content: space-between; align-items: center; }
.pill { font-size: 11px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 2px 8px; }
.row-actions { display: flex; gap: 8px; }
.row-actions .primary { background: rgba(61,255,168,.08); }
.status { min-height: 18px; font-size: 12px; color: var(--muted); }
section h3 { margin: 0 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.token-row { display: grid; grid-template-columns: 1fr auto; gap: 6px; align-items: center; margin-bottom: 8px; font-size: 12px; }
.token-row input[type=range] { width: 100%; accent-color: var(--accent); }
.token-row input[type=color], .token-row input[type=text] { width: 110px; background: #0d1118; border: 1px solid var(--line); border-radius: 8px; color: var(--text); padding: 4px 6px; }
.token-val { color: var(--accent); font-variant-numeric: tabular-nums; }
.layout-list { display: flex; flex-direction: column; gap: 6px; }
.layout-item { display: flex; align-items: center; gap: 8px; padding: 8px; border: 1px solid var(--line); border-radius: 10px; background: #12171f; cursor: grab; }
.layout-item button { margin-left: auto; }
textarea#css { width: 100%; min-height: 140px; background: #0d1118; border: 1px solid var(--line); border-radius: 10px; color: var(--text); padding: 10px; font-family: Consolas, monospace; font-size: 12px; }
.history { display: flex; flex-direction: column; gap: 6px; max-height: 180px; overflow: auto; }
.history button { text-align: left; width: 100%; }
.preview-wrap { display: flex; flex-direction: column; min-width: 0; background: #090b0f; }
.preview-bar { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-bottom: 1px solid var(--line); font-size: 12px; color: var(--muted); }
.preview-bar a { color: var(--accent); margin-left: auto; text-decoration: none; }
#preview { border: 0; background: #000; display: block; box-shadow: 0 0 0 1px var(--line); }
.preview-stage { flex: 1; overflow: auto; padding: 12px; background: #07090d; }
.mode-row, .subtabs { display: flex; gap: 6px; flex-wrap: wrap; }
.mode-row button, .subtabs button {
  border: 1px solid var(--line); background: #10151d; color: var(--muted);
  border-radius: 999px; padding: 6px 10px; cursor: pointer; font-size: 12px;
}
.mode-row button.active, .subtabs button.active { color: var(--accent); border-color: var(--accent); }
.token-lab .hint { color: var(--muted); font-size: 10px; }
.token-controls { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.token-controls input[type=number] { width: 64px; background: #0d1118; border: 1px solid var(--line); border-radius: 8px; color: var(--text); padding: 4px 6px; }
.token-controls .unit { color: var(--muted); font-size: 11px; }
.swatch { width: 18px; height: 18px; border-radius: 4px; border: 1px solid var(--line); display: inline-block; }
.slot-title { margin-top: 8px; font-size: 11px; color: var(--accent); }
.node-prop { display: flex; flex-direction: column; gap: 4px; margin-bottom: 8px; font-size: 12px; color: var(--muted); }
.node-prop input { background: #0d1118; border: 1px solid var(--line); border-radius: 8px; color: var(--text); padding: 8px; }
.scale-lab { display: flex; align-items: center; gap: 6px; }
.sticky-actions { position: sticky; top: 0; z-index: 2; background: inherit; }
.hint { color: var(--muted); font-size: 11px; }
@media (max-width: 900px) {
  .main { grid-template-columns: 1fr; }
  .panel { max-height: 45vh; border-right: 0; border-bottom: 1px solid var(--line); }
}