/* --- Modern Editor Theme - CSS Reset & Foundational Styles --- */
:root {
  /* Color Palette (Inspired by VS Code's Dark+ Theme) */
  --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', sans-serif;
  
  /* Light Theme */
  --primary-bg-light: #F3F3F3;
  --secondary-bg-light: #FFFFFF;
  --header-bg-light: #F3F3F3;
  --panel-bg-light: #FFFFFF;
  --text-color-light: #24292E;
  --text-color-secondary-light: #586069;
  --accent-color-light: #0366D6;
  --border-color-light: #E1E4E8;
  --icon-color-light: #444D56;
  --button-hover-bg-light: #E1E4E8;
  
  /* Dark Theme (VS Code Aligned) */
  --primary-bg-dark: #1E1E1E;
  --secondary-bg-dark: #252526;
  --header-bg-dark: #333333;
  --panel-bg-dark: #1E1E1E;
  --text-color-dark: #CCCCCC;
  --text-color-secondary-dark: #8B949E;
  --accent-color-dark: #007ACC;
  --border-color-dark: #3c3c3c;
  --icon-color-dark: #C5C5C5;
  --button-hover-bg-dark: #4A4A4A;
  
  /* Syntax Highlighting Icons */
  --icon-html: #E34F26;
  --icon-css: #1572B6;
  --icon-js: #F7DF1E;
}

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

body {
  font-family: var(--font-sans);
  overflow: hidden;
  transition: background-color 0.2s linear, color 0.2s linear;
}

.editor-container {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100vh;
}

/* --- Theme Class Definitions --- */
body.light-mode {
  --primary-bg: var(--primary-bg-light);
  --secondary-bg: var(--secondary-bg-light);
  --header-bg: var(--header-bg-light);
  --panel-bg: var(--panel-bg-light);
  --text-color: var(--text-color-light);
  --text-color-secondary: var(--text-color-secondary-light);
  --accent-color: var(--accent-color-light);
  --border-color: var(--border-color-light);
  --icon-color: var(--icon-color-light);
  --button-hover-bg: var(--button-hover-bg-light);
}

body.dark-mode {
  --primary-bg: var(--primary-bg-dark);
  --secondary-bg: var(--secondary-bg-dark);
  --header-bg: var(--header-bg-dark);
  --panel-bg: var(--panel-bg-dark);
  --text-color: var(--text-color-dark);
  --text-color-secondary: var(--text-color-secondary-dark);
  --accent-color: var(--accent-color-dark);
  --border-color: var(--border-color-dark);
  --icon-color: var(--icon-color-dark);
  --button-hover-bg: var(--button-hover-bg-dark);
}

/* --- Header & Title Bar --- */
.main-header {
  display: flex;
  align-items: center;
  background-color: var(--secondary-bg);
  padding: 0 10px 0 20px;
  height: 48px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 20px;
}

.logo h1 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-color);
}

/* --- File Tabs --- */
.file-tabs {
  display: flex;
  height: 100%;
  flex-grow: 1;
}

.tab {
  display: flex;
  align-items: center;
  padding: 0 15px;
  cursor: pointer;
  border-right: 1px solid var(--border-color);
  color: var(--text-color-secondary);
  font-size: 14px;
  transition: all 0.2s ease;
  border-bottom: 2px solid transparent;
}

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

.tab.active {
  background-color: var(--panel-bg);
  color: var(--text-color);
  border-bottom: 2px solid var(--accent-color);
}

.tab i {
  margin-right: 8px;
  font-size: 16px;
}

/* --- Header Actions --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

#format-code-btn, #upload-btn, #live-preview-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: transparent;
  color: var(--text-color);
  padding: 6px 12px;
  border-radius: 5px;
  cursor: pointer;
  border: 1px solid var(--border-color);
  font-family: inherit;
  font-size: 13px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

#format-code-btn:hover, #upload-btn:hover, #live-preview-btn:hover {
  background-color: var(--button-hover-bg);
}

/* --- Modern Theme Switcher --- */
.theme-switcher button {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 36px;
    height: 36px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.theme-switcher button:hover {
    background-color: var(--button-hover-bg);
}

/* --- Main Editor Content --- */
.main-content {
  flex-grow: 1;
  display: flex;
}

.editor-pane {
  position: relative;
  width: 100%; /* Full width by default */
  height: 100%;
  transition: width 0.3s ease;
}

.preview-pane {
  width: 0; /* Hidden by default */
  height: 100%;
  background-color: #fff;
  display: none; /* Use display to completely remove it from layout */
}

#preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.resizer {
  width: 5px;
  background-color: var(--border-color);
  cursor: col-resize;
  flex-shrink: 0;
  display: none; /* Hidden by default */
}

/* When preview is active */
body.preview-active .editor-pane {
  width: 50%;
}

body.preview-active .preview-pane,
body.preview-active .resizer {
  display: block; /* Show the pane and resizer */
}

body.preview-active .preview-pane {
    width: 50%;
}

.panel-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
}

/* --- Ace Editor Overrides --- */
#html, #css, #js {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  font-size: 15px !important;
  line-height: 1.6;
}

.ace_editor {
  background: var(--panel-bg) !important;
  color: var(--text-color) !important;
  font-family: 'Fira Code', 'Consolas', 'Monaco', monospace !important;
}

.ace_gutter {
  background: var(--panel-bg) !important;
  border-right: 1px solid var(--border-color);
}

/* --- Status Bar --- */
.status-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  background-color: var(--secondary-bg);
  color: var(--text-color-secondary);
  height: 24px;
  padding: 0 15px;
  font-size: 12px;
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}

/* --- Icon Colors --- */
.fa-html5 { color: var(--icon-html); }
.fa-css3-alt { color: var(--icon-css); }
.fa-js { color: var(--icon-js); }