CSS layout.css

/* =============================================
   Lego Ladder — Layout Styles
   Main layout, header, footer, panels
   ============================================= */

/* ─── App Container ─── */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ─── Header / Toolbar ─── */
.header {
  height: var(--header-height);
  background: var(--bg-panel);
  border-bottom: 2px solid var(--border-strong);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
  z-index: 10;
}

.header h1 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
}

.header h1::before {
  content: '⚡';
  font-size: 16px;
}

.header-controls {
  display: flex;
  gap: 8px;
  margin-left: auto;
  align-items: center;
}

/* ─── Main Layout ─── */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ─── Left Panel — Tool Palette ─── */
.toolbar {
  width: 185px;
  min-width: 185px;
  background: var(--bg-panel);
  border-right: 2px solid var(--border-color);
  padding: 12px;
  overflow-y: auto;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: 2px 0 4px rgba(0, 0, 0, 0.04);
}

.toolbar h3 {
  font-size: 10px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.tool-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* ─── Canvas ─── */
.canvas-container {
  flex: 1;
  overflow: auto;
  padding: 24px;
  /* Subtle dot grid — much lighter than the SVG grid to avoid visual noise */
  background-image: radial-gradient(circle, rgba(0,0,0,0.08) 1px, transparent 1px);
  background-size: 24px 24px;
  background-color: var(--bg-canvas);
  display: flex;
  justify-content: center;
}

/* ─── Right Panel — Config ─── */
.config-panel {
  width: 300px;
  min-width: 300px;
  background: var(--bg-panel);
  border-left: 2px solid var(--border-color);
  overflow-y: auto;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  box-shadow: -3px 0 6px rgba(0, 0, 0, 0.06);
}

.config-panel-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-primary);
}

.config-panel-header h3 {
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.config-panel-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.config-panel-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-primary);
  display: flex;
  gap: 8px;
}

/* ─── Footer / Status Bar ─── */
.footer {
  height: var(--footer-height);
  padding: 0 24px;
  background: var(--bg-panel);
  border-top: 2px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 11px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.footer .status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.footer .status::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.footer .status.running::before {
  background: var(--success);
  animation: pulse-green 2s ease-in-out infinite;
}

.footer .cycle {
  font-family: 'SF Mono', 'Consolas', 'Menlo', monospace;
  color: var(--text-muted);
}