/* Global Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background var(--transition-normal), color var(--transition-normal);
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--brand-primary-hover);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-app);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  opacity: 0.3;
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-app);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-primary);
}

/* App Header */
header {
  background-color: var(--bg-app);
  padding: 1rem var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--brand-primary);
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-main);
}

.brand-text h1 span {
  color: var(--brand-primary);
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* Main Layout Grid */
.app-container {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
  padding: 0 var(--spacing-md) var(--spacing-md) var(--spacing-md);
}

.main-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--glass-shadow);
  padding: var(--spacing-sm);
}

/* Navigation & Sub-header Tab Bar */
.tab-navbar {
  background-color: var(--bg-app);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  height: 52px;
  flex-shrink: 0;
  border-radius: var(--radius-lg);
}

.nav-tabs {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  height: 100%;
}

.nav-tab {
  background: var(--bg-app);
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.825rem;
  font-weight: 700;
  padding: 0 var(--spacing-lg);
  height: 36px;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: relative;
  box-shadow: var(--btn-shadow);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--text-main);
  transform: translateY(-1px);
}

.nav-tab.active {
  background: var(--bg-app);
  color: var(--brand-primary) !important;
  box-shadow: var(--inset-shadow);
  transform: translateY(0);
}

/* Workspaces Split-Pane Layout */
.workspace-panes {
  display: flex;
  flex: 1;
  overflow: hidden;
  background-color: var(--bg-app);
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
}

.pane {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  position: relative;
  background-color: var(--bg-app);
  border-radius: var(--radius-lg);
}

.pane-left {
  max-width: 50%;
  min-width: 300px;
}

.pane-right {
  background-color: var(--bg-app);
}

.pane-header {
  background-color: var(--bg-app);
  padding: 0.5rem var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 46px;
  flex-shrink: 0;
}

.pane-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.pane-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.pane-body {
  flex: 1;
  overflow: auto;
  position: relative;
  border-radius: var(--radius-lg);
}

/* App Footer / Status Bar */
footer {
  background-color: var(--bg-app);
  padding: 0.75rem var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-xs);
}

.status-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--text-muted);
  display: inline-block;
  box-shadow: inset 1px 1px 2px rgba(0,0,0,0.2);
}

.status-dot.valid {
  background-color: var(--brand-success);
  box-shadow: 0 0 10px var(--brand-success);
}

.status-dot.invalid {
  background-color: var(--brand-danger);
  box-shadow: 0 0 10px var(--brand-danger);
}

.status-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.keyboard-shortcut-tip {
  color: var(--text-muted);
  font-size: 0.7rem;
  background-color: var(--bg-app);
  box-shadow: var(--inset-shadow);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}