:root {
  --bg0: #09090b;
  --color-panel: rgba(255, 255, 255, 0.04);
  --color-panel-2: rgba(255, 255, 255, 0.06);
  --stroke: rgba(255, 255, 255, 0.08);
  --stroke2: rgba(255, 255, 255, 0.12);
  --text0: rgba(255, 255, 255, 0.92);
  --text1: rgba(255, 255, 255, 0.72);
  --text2: rgba(255, 255, 255, 0.52);
  --accent: #7c3aed;
  --accent2: #a78bfa;
  --accent-border: rgba(124, 58, 237, 0.55);
  --accent-fill-solid: rgba(124, 58, 237, 0.92);
  --accent-fill-soft: rgba(124, 58, 237, 0.1);
  --color-danger: rgba(248, 113, 113, 0.95);
  --radius-sm: 8px;
  --radius-md: 12px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  font-family: 'Segoe UI', 'IBM Plex Sans', system-ui, sans-serif;
  color: var(--text0);
  background: var(--bg0);
}

* { box-sizing: border-box; }
html, body, #root { margin: 0; height: 100%; }

button {
  height: 34px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: var(--color-panel);
  color: var(--text0);
  cursor: pointer;
}
button.primary {
  border: 1px solid var(--accent-border);
  background: var(--accent-fill-solid);
}
button:disabled { opacity: 0.45; cursor: not-allowed; }

input, select, textarea {
  background: var(--color-panel-2);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-sm);
  color: var(--text0);
  padding: 8px 10px;
  width: 100%;
}

.appShell {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 100%;
}
.sidebar {
  border-right: 1px solid var(--stroke);
  background: #18181b;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.brand { font-size: 18px; font-weight: 700; }
.brand span { color: var(--accent2); }
.navBtn { text-align: left; width: 100%; }
.navBtn.active {
  border-color: var(--accent-border);
  background: var(--accent-fill-soft);
}
.statusLine { margin-top: auto; font-size: 12px; min-height: 2.5em; }
.main { padding: 20px; overflow: auto; }

.panel {
  background: var(--color-panel);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}
.heroPanel {
  margin-bottom: 16px;
}
.heroPanel h1 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
}
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.row.wrap { flex-wrap: wrap; }
.muted { color: var(--text2); }
.error { color: var(--color-danger); font-size: 13px; }

.systemsGrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}
.systemCard {
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: var(--color-panel-2);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.nameInput { max-width: 360px; }
.stickyBar { position: sticky; top: 0; z-index: 5; backdrop-filter: blur(8px); }

.sheetCanvas {
  position: relative;
  min-height: 720px;
  background:
    linear-gradient(var(--stroke) 1px, transparent 1px) 0 0 / 16px 16px,
    linear-gradient(90deg, var(--stroke) 1px, transparent 1px) 0 0 / 16px 16px,
    #0c0c10;
  border: 1px solid var(--stroke2);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.widget {
  position: absolute;
  border: 1px solid var(--stroke2);
  background: rgba(10, 10, 14, 0.94);
  border-radius: 8px;
  padding: 8px;
  overflow: hidden;
  touch-action: none;
  user-select: none;
}
.widget.selected {
  border-color: var(--accent2);
  box-shadow: 0 0 0 1px var(--accent-border);
}
.widgetChrome {
  font-size: 10px;
  color: var(--text2);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.widgetBody { pointer-events: none; }
.resizeHandle {
  position: absolute;
  right: 2px;
  bottom: 2px;
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background: var(--accent-fill-soft);
  border: 1px solid var(--accent-border);
  cursor: nwse-resize;
  pointer-events: auto;
}

.designerGrid {
  display: grid;
  grid-template-columns: 220px 1fr 240px;
  gap: 12px;
  min-height: calc(100vh - 120px);
}
.designerSide {
  max-height: calc(100vh - 120px);
  overflow: auto;
}
.sideTitle {
  font-weight: 700;
  margin: 8px 0;
  color: var(--text1);
}
.palette { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.paletteItem { width: 100%; text-align: left; }
.brickList { margin-top: 8px; display: flex; flex-direction: column; gap: 4px; }
.brickRow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  padding: 4px 6px;
  border: 1px solid var(--stroke);
  border-radius: 6px;
}
.brickRow button { height: 24px; padding: 0 8px; }
.propsForm { display: flex; flex-direction: column; gap: 10px; }
.propsForm label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--text1); }
.designerCanvasHost { min-width: 0; }