/* ==========================================================================
   R2Art JSON Diff — App Layout & Shell
   ========================================================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

.app-root {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* 1. Header Navigation Bar */
.top-navbar {
  height: var(--header-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justifyContent: space-between;
  padding: 0 1.25rem;
  flex-shrink: 0;
  z-index: 20;
}

.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-logo-icon {
  width: 28px;
  height: 28px;
  background-color: var(--primary-clay);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justifyContent: center;
  font-size: 14px;
  font-weight: bold;
}

.brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.brand-suite-tag {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--primary-clay-light);
  color: var(--primary-clay);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-weight: 700;
}

/* 2. Mode Switch & Secondary Actions Toolbar */
.control-toolbar {
  height: var(--toolbar-height);
  background-color: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justifyContent: space-between;
  padding: 0 1.25rem;
  flex-shrink: 0;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.view-mode-tabs {
  display: flex;
  background-color: var(--bg-surface-alt);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.view-mode-tab {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all var(--transition-fast);
}

.view-mode-tab:hover {
  color: var(--text-primary);
}

.view-mode-tab.active {
  background-color: var(--bg-surface);
  color: var(--primary-clay);
  box-shadow: var(--shadow-xs);
}

/* 3. Main Workspace Area */
.workspace-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* Dual Editor Panes Layout */
.editors-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.editor-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
}

.editor-pane:last-child {
  border-right: none;
}

.editor-header {
  height: 38px;
  background-color: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justifyContent: space-between;
  padding: 0 0.85rem;
  flex-shrink: 0;
}

.editor-title {
  font-size: 0.82rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-primary);
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.editor-body {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

.line-gutter {
  width: 44px;
  background-color: var(--bg-surface-elevated);
  border-right: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 10px 6px;
  text-align: right;
  user-select: none;
  overflow: hidden;
  line-height: 1.5;
}

.json-textarea {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  padding: 10px;
  resize: none;
  white-space: pre;
  overflow: auto;
  tab-size: 2;
}

/* Diff Results Layout */
.diff-view-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-surface);
}

/* 4. Footer Statusbar */
.statusbar {
  height: var(--statusbar-height);
  background-color: var(--bg-surface-elevated);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justifyContent: space-between;
  padding: 0 1rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.statusbar-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Responsive adjustments */
@media (max-width: 860px) {
  .editors-grid {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }
  .editor-pane {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}