:root {
  /* Flat modern dark theme */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --accent-blue: #58a6ff;
  --accent-green: #3fb950;
  --accent-red: #f85149;
  --accent-orange: #d29922;
  --btn-hover: #30363d;
  
  /* Light theme colors */
  --light-bg: #ffffff;
  --light-secondary-bg: #f6f8fa;
  --light-tertiary-bg: #e1e4e8;
  --light-border: #d0d7de;
  --light-text: #24292f;
  --light-text-secondary: #57606a;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.light-theme {
  background: var(--light-bg);
  color: var(--light-text);
}

/* Header */
.header-glass {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  max-width: 1000px;
  width: 90%;
  margin: 0.5rem auto;
  border-radius: 12px;
}

.header-glass h1 {
  margin: 0;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 10px;
}

.header {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  max-width: 1000px;
  width: 90%;
  margin: 0.5rem auto;
}

.header h1 {
  margin: 0;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Main container */
.glass-container {
  max-width: 1000px;
  width: 90%;
  margin: 1rem auto;
  background: var(--bg-secondary);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

/* Toolbars */
.glass-toolbar {
  background: var(--bg-tertiary);
  padding: 15px;
  display: flex;
  gap: 10px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.format-toolbar {
  background: var(--bg-tertiary);
  padding: 10px 20px;
  display: flex;
  gap: 15px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  flex-wrap: wrap;
}

/* Buttons */
.glass-button {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 5px;
}

.glass-button:hover {
  background: var(--btn-hover);
  border-color: var(--accent-blue);
  color: #ffffff;
}

.glass-button.negative {
  background: var(--bg-tertiary);
  border-color: var(--accent-red);
}

.glass-button.negative:hover {
  background: rgba(248, 81, 73, 0.15);
  border-color: var(--accent-red);
}

/* Select */
.glass-select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  min-width: 180px;
}

.glass-select:focus {
  border-color: var(--accent-blue);
  outline: none;
}

.font-select { min-width: 140px; }
.size-select { min-width: 70px; }

/* Editor */
.editor-area {
  display: flex;
  flex-direction: column;
  padding: 20px;
  flex-grow: 1;
}

.document-title input {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 10px 15px;
  font-size: 18px;
  border-radius: 6px;
  width: 100%;
  margin-bottom: 15px;
}

.document-title input:focus {
  border-color: var(--accent-blue);
  outline: none;
}

#editor {
  flex-grow: 1;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 20px;
  font-size: 16px;
  line-height: 1.6;
  resize: none;
  font-family: 'Open Sans', monospace;
  min-height: 300px;
}

#editor:focus {
  outline: none;
  border-color: var(--accent-blue);
}

/* Icon buttons */
.icon-button {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  width: 36px;
  height: 36px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.icon-button:hover {
  background: var(--btn-hover);
  border-color: var(--accent-blue);
}

.icon-button.active {
  background: var(--btn-hover);
  border-color: var(--accent-blue);
}

/* Buttons and selects (generic overrides) */
button, select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

button:hover {
  background: var(--btn-hover);
  border-color: var(--accent-blue);
}

/* Export toolbar */
.export-toolbar {
  display: flex;
  gap: 10px;
  padding: 15px 20px;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  justify-content: center;
}

.export-button {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 8px 15px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.export-button:hover {
  background: var(--btn-hover);
  border-color: var(--accent-blue);
}

.export-button.txt {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}
.export-button.txt:hover { background: #1f3a5f; border-color: var(--accent-blue); }
.export-button.pdf {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}
.export-button.pdf:hover { background: #3d1f1f; border-color: var(--accent-red); }
.export-button.markdown {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}
.export-button.markdown:hover { background: #1f3d1f; border-color: var(--accent-green); }
.export-button.docx {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}
.export-button.docx:hover { background: #1f3a5f; border-color: var(--accent-blue); }
.export-button.xlsx {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}
.export-button.xlsx:hover { background: #1f3d1f; border-color: var(--accent-green); }

/* Sidebar */
.sidebar-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 90;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  width: 250px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 20px 15px;
  box-shadow: 2px 0 8px rgba(0,0,0,0.3);
  z-index: 80;
  transition: transform 0.3s;
}

.sidebar h3 {
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: 20px 0 10px;
}

.document-list, .template-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.document-list li, .template-list li {
  padding: 8px 0;
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.document-list li:hover, .template-list li:hover {
  color: var(--accent-blue);
}

/* Document title row */
.document-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.document-title { flex-grow: 1; margin-bottom: 0; }

/* Autosave */
.autosave-container { margin-left: 15px; display: flex; align-items: center; }
.autosave-label {
  display: flex; align-items: center; cursor: pointer; user-select: none;
  background: var(--bg-tertiary); padding: 6px 12px; border-radius: 6px;
  border: 1px solid var(--border-color); transition: all 0.2s;
}
.autosave-label:hover { background: var(--btn-hover); border-color: var(--accent-blue); }
.autosave-label input[type="checkbox"] { margin-right: 5px; }
.autosave-text { color: var(--text-secondary); font-size: 14px; }
.autosave-status { margin-left: 8px; font-size: 12px; opacity: 0; transition: opacity 0.3s; }
.autosave-status.saving { color: var(--accent-blue); opacity: 1; }
.autosave-status.saved { color: var(--accent-green); opacity: 1; animation: fadeOut 2s ease-in-out forwards; animation-delay: 1s; }
.autosave-status.error { color: var(--accent-red); opacity: 1; }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }

/* Notification */
.notification {
  position: fixed; bottom: 30px; right: 30px; padding: 12px 20px;
  background: #1f6feb; color: white; border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3); opacity: 0;
  transition: opacity 0.3s; z-index: 1000;
}
.notification.success { background: #238636; }
.notification.error { background: #da3633; }
.notification.show { opacity: 1; }

/* AI Assistant */
.assistant-button {
  position: fixed; bottom: 30px; right: 30px; width: 60px; height: 60px;
  background: linear-gradient(135deg, #238636, #2ea043);
  color: white; border: none; border-radius: 50%; font-size: 24px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  z-index: 1000; transition: all 0.2s;
}
.assistant-button:hover { transform: scale(1.1); box-shadow: 0 6px 16px rgba(0,0,0,0.4); }

.assistant-panel {
  position: fixed; bottom: 100px; right: 30px; width: 350px; max-height: 500px;
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  display: flex; flex-direction: column; z-index: 999;
  transform: scale(0.9); opacity: 0; transform-origin: bottom right;
  pointer-events: none; transition: all 0.3s; overflow: hidden;
}
.assistant-panel.active { transform: scale(1); opacity: 1; pointer-events: all; }
.assistant-header {
  padding: 15px; background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex; justify-content: space-between; align-items: center;
}
.assistant-title { display: flex; align-items: center; gap: 8px; color: var(--text-primary); font-weight: 600; }
.assistant-title i { color: var(--accent-green); }
.assistant-close { background: transparent; border: none; color: var(--text-secondary); font-size: 18px; cursor: pointer; }
.assistant-body { flex-grow: 1; overflow-y: auto; padding: 15px; }
.assistant-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 15px; }
.assistant-option {
  background: var(--bg-tertiary); border: 1px solid var(--border-color);
  border-radius: 8px; padding: 12px; color: var(--text-primary);
  font-size: 14px; cursor: pointer; text-align: center; transition: all 0.2s;
}
.assistant-option:hover { background: var(--btn-hover); border-color: var(--accent-blue); }
.assistant-conversation { margin-top: 15px; display: flex; flex-direction: column; gap: 15px; }
.assistant-response { background: var(--bg-tertiary); border-radius: 10px; padding: 12px; color: var(--text-primary); font-size: 14px; line-height: 1.5; border-left: 3px solid var(--accent-green); }
.assistant-response h4 { margin-top: 0; margin-bottom: 8px; color: var(--accent-green); font-size: 15px; }
.assistant-response p { margin: 0 0 8px 0; }
.assistant-action { display: flex; gap: 8px; margin-top: 8px; }
.assistant-action button { background: var(--bg-tertiary); color: var(--text-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 5px 8px; font-size: 12px; cursor: pointer; }
.assistant-action button:hover { background: var(--btn-hover); border-color: var(--accent-blue); }
.assistant-instructions { color: var(--text-secondary); font-size: 13px; text-align: center; }
.assistant-thinking { display: flex; align-items: center; justify-content: center; padding: 20px; color: var(--text-secondary); font-style: italic; }
.assistant-thinking i { margin-right: 8px; animation: spin 1.5s linear infinite; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* Light theme */
.light-theme .header-glass { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme .glass-container { background: #ffffff; border-color: var(--light-border); }
.light-theme .glass-toolbar { background: #f6f8fa; border-color: var(--light-border); }
.light-theme .format-toolbar { background: #f6f8fa; border-color: var(--light-border); }
.light-theme .glass-button { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme .glass-button:hover { background: #e1e4e8; border-color: #0969da; }
.light-theme .glass-select { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme #editor { background: #ffffff; color: var(--light-text); border-color: var(--light-border); }
.light-theme .document-title input { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme .export-toolbar { background: #f6f8fa; border-color: var(--light-border); }
.light-theme .export-button { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme .export-button:hover { background: #e1e4e8; border-color: #0969da; }
.light-theme .sidebar { background: #ffffff; border-color: var(--light-border); }
.light-theme .assistant-panel { background: #ffffff; border-color: var(--light-border); }
.light-theme .assistant-header { background: #f6f8fa; border-color: var(--light-border); }
.light-theme .assistant-option { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme .assistant-option:hover { background: #e1e4e8; border-color: #0969da; }
.light-theme .assistant-response { background: #f6f8fa; color: var(--light-text); }
.light-theme .autosave-label { background: #f6f8fa; border-color: var(--light-border); }
.light-theme .autosave-label:hover { background: #e1e4e8; border-color: #0969da; }
.light-theme .autosave-text { color: var(--light-text-secondary); }
.light-theme .icon-button { background: #f6f8fa; color: var(--light-text); border-color: var(--light-border); }
.light-theme .icon-button:hover { background: #e1e4e8; border-color: #0969da; }
.light-theme .sidebar-toggle { background: #f6f8fa; border-color: var(--light-border); }

/* App container */
.app-container { display: flex; flex-grow: 1; }

/* Theme switch */
.theme-switch-container { display: flex; align-items: center; opacity: 0.5; transform: scale(0.7); margin: 0 5px; }
.theme-switch-container:hover { opacity: 0.8; }
.theme-switch { position: relative; display: inline-block; width: 40px; height: 20px; margin: 0 5px; }
.theme-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background: var(--bg-tertiary); border: 1px solid var(--border-color); transition: .4s; border-radius: 34px; }
.slider:before { position: absolute; content: ""; height: 14px; width: 14px; left: 3px; bottom: 2px; background-color: white; transition: .4s; border-radius: 50%; }
input:checked + .slider { background: #1f6feb; }
input:checked + .slider:before { transform: translateX(20px); }
.theme-icon { color: var(--text-secondary); font-size: 12px; }

/* Format groups */
.format-group { display: flex; align-items: center; gap: 8px; }
.format-label { font-size: 13px; color: var(--text-secondary); }
.formatting-toolbar { display: flex; gap: 5px; margin-left: auto; }

/* Fullscreen styles */
.glass-container:-webkit-full-screen { background: #0d1117; padding: 20px; width: 100vw; height: 100vh; }
.glass-container:fullscreen { background: #0d1117; padding: 20px; width: 100vw; height: 100vh; }
.light-theme .glass-container:-webkit-full-screen { background: #ffffff; }
.light-theme .glass-container:fullscreen { background: #ffffff; }
.glass-container:fullscreen .glass-toolbar, .glass-container:fullscreen .format-toolbar,
.glass-container:-webkit-full-screen .glass-toolbar, .glass-container:-webkit-full-screen .format-toolbar {
  position: sticky; top: 0; z-index: 100;
}

/* Misc */
.chat-assistant-button, .chat-assistant-window { display: none !important; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; }
.form-group input, .form-group textarea { width: 100%; padding: 10px; background: var(--bg-primary); color: var(--text-primary); border: 1px solid var(--border-color); border-radius: 8px; box-sizing: border-box; }
.form-group textarea { min-height: 300px; font-family: 'Courier New', monospace; }
.main-content { flex-grow: 1; display: flex; flex-direction: column; }

/* Hide sidebar when not in writer context? Fallback safe */
.sidebar-toggle { display: flex !important; }

@media (max-width: 600px) {
  .chat-assistant-button, .assistant-button { right: 10px; }
}

/* Override: hide nav back-link for a[href="../"] */
.nav-links a[title="Chat"] { display: none !important; }