* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

body {
  background-color: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.4;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

header.hud-header {
  height: 48px;
  background-color: var(--bg-panel);
  border-bottom: 1px solid var(--border-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.header-status {
  display: flex;
  gap: 12px;
  align-items: center;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--border-bright);
}

.status-dot.active {
  background-color: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

.status-dot.degraded {
  background-color: var(--accent-amber);
  box-shadow: 0 0 8px var(--accent-amber);
}

main.app-shell {
  flex: 1;
  display: grid;
  grid-template-columns: 410px 1fr;
  grid-template-rows: 1fr 220px;
  gap: 12px;
  padding: 12px;
  height: calc(100vh - 48px);
  min-height: 0;
}

.sidebar-panel {
  grid-column: 1;
  grid-row: 1 / 3;
  background: var(--bg-panel);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  overflow-y: auto;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.visualizer-viewport {
  grid-column: 2;
  grid-row: 1;
  background: var(--bg-panel);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.master-controller-panel {
  grid-column: 2;
  grid-row: 2;
  background: var(--bg-panel);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow-y: auto;
}