/* ==========================================================================
   Header & Navigation Toolbar
   ========================================================================== */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-header);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  gap: 12px;
  user-select: none;
  z-index: var(--z-header);
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 22px;
  height: 22px;
  background-color: transparent;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-run);
  flex-shrink: 0;
}

.brand-icon svg {
  width: 13px;
  height: 13px;
}

.brand-text {
  display: flex;
  align-items: baseline;
}

.brand-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

/* Header Action Buttons */
.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: inherit;
  font-size: 12px;
  line-height: 1;
  transition: background-color 0.12s ease, border-color 0.12s ease, color 0.12s ease;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* Primary Action: Run Button */
.btn-run {
  background-color: var(--accent-run);
  color: var(--accent-run-text);
  font-weight: 500;
  height: 28px;
  padding: 0 10px;
  border: 1px solid transparent;
}

.btn-run:hover {
  background-color: var(--accent-run-hover);
}

.btn-run:active {
  background-color: var(--accent-run-active);
}

.btn-run kbd {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 400;
  background-color: rgba(0, 0, 0, 0.25);
  padding: 2px 4px;
  border-radius: 2px;
  margin-left: 2px;
}

/* Quieter Secondary Toolbar Buttons */
.btn-quiet {
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
  font-weight: 400;
  height: 28px;
  padding: 0 8px;
}

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

.btn-quiet:active {
  background-color: var(--bg-active);
}

.btn-quiet.btn-danger:hover {
  color: var(--accent-danger);
  background-color: rgba(207, 78, 78, 0.08);
  border-color: rgba(207, 78, 78, 0.2);
}

/* Custom Compact Developer Toggle Control */
.toggle-control {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
  padding: 0 4px;
  height: 28px;
}

.toggle-label {
  font-size: 11px;
  font-family: inherit;
  color: var(--text-secondary);
  transition: color 0.12s ease;
  line-height: 1;
}

.toggle-control:hover .toggle-label {
  color: var(--text-primary);
}

.toggle-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 26px;
  height: 14px;
  flex-shrink: 0;
}

/* Visually hidden but keyboard-accessible native checkbox */
.toggle-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 1;
}

/* Custom switch track */
.toggle-track {
  position: absolute;
  inset: 0;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xs);
  transition: background-color 0.12s ease, border-color 0.12s ease;
  pointer-events: none;
}

/* Custom switch thumb */
.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 8px;
  height: 8px;
  background-color: var(--text-muted);
  border-radius: 1px;
  transition: transform 0.12s ease, background-color 0.12s ease;
}

/* Hover state */
.toggle-control:hover .toggle-track {
  border-color: var(--border-strong);
}

/* Enabled state */
.toggle-input:checked + .toggle-track {
  background-color: rgba(217, 119, 54, 0.12);
  border-color: var(--accent-run);
}

.toggle-input:checked + .toggle-track .toggle-thumb {
  transform: translateX(12px);
  background-color: var(--accent-run);
}

/* Accessible focus ring */
.toggle-input:focus-visible + .toggle-track {
  outline: 2px solid var(--border-focus);
  outline-offset: 1px;
}

/* Minimal divider */
.toolbar-divider {
  width: 1px;
  height: 16px;
  background-color: var(--border-subtle);
  margin: 0 3px;
}

/* PWA Install Button */
.btn-install {
  display: none;
  background-color: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
  height: 28px;
  padding: 0 8px;
  font-size: 12px;
}

.btn-install.is-available {
  display: inline-flex;
}

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

/* ==========================================================================
   Editor Tabs & Controls
   ========================================================================== */
.editor-header {
  height: var(--tab-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
  user-select: none;
  flex-shrink: 0;
}

.editor-tabs {
  display: flex;
  align-items: center;
  gap: 2px;
  height: 100%;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  height: var(--tab-height);
  padding: 0 12px;
  font-size: 12px;
  font-weight: 400;
  font-family: var(--font-mono);
  color: var(--text-muted);
  background: transparent;
  transition: color 0.12s ease;
  position: relative;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
}

.tab-btn:hover {
  color: var(--text-secondary);
}

.tab-btn.is-active {
  color: var(--text-primary);
  background: transparent;
  border-bottom-color: var(--accent-run);
}

/* ==========================================================================
   Editor Body & Textarea / CodeMirror
   ========================================================================== */
.editor-body {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-editor);
}

.editor-instance-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: none;
  height: 100%;
  width: 100%;
}

.editor-instance-container.is-active {
  display: block;
}

/* Fallback Textarea Editor */
.code-textarea {
  width: 100%;
  height: 100%;
  background-color: var(--bg-editor);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.68;
  border: none;
  resize: none;
  outline: none;
  padding: 14px 16px;
  tab-size: 2;
  white-space: pre;
  word-wrap: normal;
  overflow: auto;
}

/* CodeMirror Custom Overrides - Neutral Restrained Dark */
.CodeMirror {
  height: 100% !important;
  font-family: var(--font-mono) !important;
  font-size: 13px !important;
  line-height: 1.68 !important;
  background-color: var(--bg-editor) !important;
  color: var(--text-primary) !important;
}

.CodeMirror-lines {
  padding: 10px 0 !important;
}

.CodeMirror-gutters {
  background-color: var(--bg-editor) !important;
  border-right: 1px solid var(--border-subtle) !important;
}

.CodeMirror-linenumber {
  color: var(--text-muted) !important;
  padding: 0 8px 0 4px !important;
}

.CodeMirror-cursor {
  border-left: 2px solid var(--accent-run) !important;
}

.CodeMirror-selected {
  background: var(--bg-active) !important;
}

.cm-s-default .cm-tag { color: #d06d64; }
.cm-s-default .cm-attribute { color: #d99b53; }
.cm-s-default .cm-string { color: #76a87b; }
.cm-s-default .cm-keyword { color: #7b9ab8; }
.cm-s-default .cm-variable { color: #cdd2db; }
.cm-s-default .cm-property { color: #8faec5; }
.cm-s-default .cm-comment { color: #5a606d; font-style: italic; }
.cm-s-default .cm-number { color: #c482a4; }
.cm-s-default .cm-atom { color: #9f8fb5; }
.cm-s-default .cm-def { color: #d99b53; }

/* ==========================================================================
   Preview Pane & Header
   ========================================================================== */
.preview-header {
  height: var(--tab-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  user-select: none;
  flex-shrink: 0;
}

.preview-title-group {
  display: flex;
  align-items: center;
}

.preview-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.preview-tools {
  display: flex;
  align-items: center;
  gap: 3px;
}

.btn-icon {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  transition: color 0.12s ease, background-color 0.12s ease;
}

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

.btn-icon svg {
  width: 13px;
  height: 13px;
}

.btn-mobile-edit {
  display: none;
}

/* Preview Content Container & Iframe */
.preview-body {
  flex: 1;
  min-height: 0;
  position: relative;
  background-color: #ffffff;
  overflow: hidden;
  width: 100%;
  height: 100%;
}

.preview-frame {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  background-color: #ffffff;
  display: block;
}



/* ==========================================================================
   Modal Dialog (Reset confirmation)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.12s ease, visibility 0.12s ease;
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 380px;
  padding: 18px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.modal-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.modal-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 16px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 34px;
  right: 14px;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
}

.toast {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 6px;
  pointer-events: auto;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.toast.is-show {
  opacity: 1;
  transform: translateY(0);
}

.toast svg {
  width: 13px;
  height: 13px;
  color: var(--accent-run);
  flex-shrink: 0;
}