:root {
  /* VS Code Dark Theme Colors */
  --bg-color: #1e1e1e;
  --sidebar-bg: #252526;
  --activity-bar-bg: #333333;
  --editor-bg: #1e1e1e;
  --panel-bg: #1e1e1e;
  --status-bar-bg: #007acc;
  --status-bar-fg: #ffffff;
  --title-bar-bg: #3c3c3c;
  --title-bar-fg: #cccccc;

  --text-primary: #d4d4d4;
  --text-secondary: #a0a0a0;
  --text-accent: #007acc;
  --text-error: #f48771;
  --text-success: #89d185;

  --border-color: #3e3e42;
  --hover-bg: #2a2d2e;
  --selection-bg: #264f78;

  /* Fonts */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', Consolas, "Courier New", monospace;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
}

body.light-theme {
  --bg-color: #ffffff;
  --sidebar-bg: #f3f3f3;
  --activity-bar-bg: #e0e0e0;
  --editor-bg: #ffffff;
  --panel-bg: #ffffff;
  --status-bar-bg: #007acc;
  --status-bar-fg: #ffffff;
  --title-bar-bg: #dddddd;
  --title-bar-fg: #333333;

  --text-primary: #333333;
  --text-secondary: #666666;
  --text-accent: #005fa3;
  --text-error: #cd3131;
  --text-success: #008000;

  --border-color: #e5e5e5;
  --hover-bg: #e8e8e8;
  --selection-bg: #add6ff;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-ui);
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
  color: var(--text-primary);
}

a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  text-decoration: underline;
}

/* Layout - Header */
header {
  height: 40px;
  background-color: var(--title-bar-bg);
  color: var(--title-bar-fg);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  font-size: 13px;
}

.logo {
  font-family: var(--font-code);
  font-weight: bold;
  letter-spacing: 1px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo span {
  color: var(--text-accent);
}

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

.header-btn {
  background: none;
  border: none;
  color: var(--title-bar-fg);
  cursor: pointer;
  font-size: 13px;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}

.header-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* Layout - Main Area */
.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 250px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-header {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 11px;
  text-transform: uppercase;
  font-weight: bold;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

.sidebar-item {
  padding: 6px var(--spacing-md);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-left: 2px solid transparent;
}

.sidebar-item:hover {
  background-color: var(--hover-bg);
}

.sidebar-item.active {
  background-color: var(--hover-bg);
  border-left-color: var(--text-accent);
  color: var(--text-primary);
}

/* System Monitor */
.system-monitor {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.2);
    font-family: var(--font-code);
    margin-top: auto; /* Push to bottom */
}

.monitor-header {
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.monitor-pulse {
    width: 8px;
    height: 8px;
    background-color: var(--text-success);
    border-radius: 50%;
    box-shadow: 0 0 5px var(--text-success);
    animation: pulse 2s infinite;
}

.stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.stat-card {
    background-color: var(--bg-color);
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.stat-label {
    font-size: 10px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: bold;
}

.stat-value.high {
    color: var(--text-error);
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.7; }
    50% { transform: scale(1.1); opacity: 1; box-shadow: 0 0 10px var(--text-success); }
    100% { transform: scale(0.95); opacity: 0.7; }
}

/* Editor Area */
.editor-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--editor-bg);
  position: relative;
}

.editor-tabs {
  height: 35px;
  background-color: var(--bg-color);
  display: flex;
  align-items: center;
  padding-left: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.tab {
  background-color: var(--editor-bg);
  padding: 8px 16px;
  font-size: 13px;
  color: var(--text-primary);
  border-right: 1px solid var(--border-color);
  border-top: 2px solid var(--text-accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* CodeMirror Overrides for Dark Theme integration */
.cm-editor {
  height: 100%;
  font-family: var(--font-code) !important;
  font-size: var(--editor-font-size, 14px);
}

.cm-scroller {
  overflow: auto !important;
}

/* Output Panel (Split) */
.output-panel {
  width: 40%;
  background-color: var(--panel-bg);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.output-header {
  height: 35px;
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  justify-content: space-between;
}

.output-title {
  font-size: 11px;
  text-transform: uppercase;
  font-weight: bold;
  color: var(--text-secondary);
}

.output-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
}

.icon-btn:hover {
  background-color: var(--hover-bg);
  color: var(--text-primary);
}

.output-console {
  flex: 1;
  padding: var(--spacing-md);
  font-family: var(--font-code);
  font-size: 13px;
  overflow-y: auto;
  white-space: pre-wrap;
  color: var(--text-primary);
}

.log-entry {
  margin-bottom: 4px;
  display: flex;
  gap: 8px;
}

.log-timestamp {
  color: var(--text-secondary);
  opacity: 0.6;
  font-size: 11px;
  min-width: 60px;
}

.log-content {
  flex: 1;
}

.log-error {
  color: var(--text-error);
}

.log-success {
  color: var(--text-success);
}

.log-info {
  color: var(--text-accent);
}

/* Status Bar */
.status-bar {
  height: 22px;
  background-color: var(--status-bar-bg);
  color: var(--status-bar-fg);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  font-size: 12px;
  justify-content: space-between;
}

.status-left, .status-right {
  display: flex;
  gap: var(--spacing-md);
}

/* Landing Page Specifics */
.landing-page {
  overflow-y: auto;
  height: 100vh;
  background: radial-gradient(circle at top center, #1a1a2e 0%, #000000 100%);
}

.hero {
  padding: 100px 20px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(90deg, #fff, #a0a0a0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.5;
}

.cta-btn {
  background-color: var(--text-accent);
  color: white;
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 16px;
  display: inline-block;
  transition: transform 0.2s, background-color 0.2s;
  text-decoration: none;
}

.cta-btn:hover {
  background-color: #005fa3;
  transform: translateY(-2px);
  text-decoration: none;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
}

.feature-card {
  background-color: rgba(255, 255, 255, 0.05);
  padding: var(--spacing-lg);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-5px);
  background-color: rgba(255, 255, 255, 0.08);
}

.feature-card h3 {
  color: var(--text-accent);
  margin-bottom: var(--spacing-sm);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

/* Spinner */
.spinner {
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-left-color: var(--text-accent);
  border-radius: 50%;
  width: 12px;
  height: 12px;
  animation: spin 1s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .main-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    max-height: 150px;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .output-panel {
    width: 100%;
    height: 300px;
    border-left: none;
    border-top: 1px solid var(--border-color);
  }

  .hero h1 {
    font-size: 32px;
  }
}