:root {
	--text-color: #f8f8f2;
	--editor-bg: #16181b;
	scrollbar-color: grey var(--editor-bg);
}

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

html, body {
	overscroll-behavior: none;
	background-color: var(--editor-bg);
}

html {
	height: 100%;
}

body {
	font-family: monospace;
	background: var(--editor-bg);
	color: var(--text-color);
	height: 100%;
	display: flex;
	overflow: hidden;
}

.editor-pane {
	width: 50%;
	height: 100%;
	position: relative;
	transition: opacity 0.1s ease-out;
}

.preview-pane {
	width: 50%;
	height: 100%;
	display: flex;
	flex-direction: column;
	--grid-width: 33px;
	--grid-height: 33px;
	--spread-left: 0px;
	--spread-top: 0px;
	background:
		linear-gradient(to bottom, #1a4d3a, #184534);
}

.preview-pane.grid-ready {
	background:
		linear-gradient(to right, #4a7a6a 1px, transparent 1px),
		linear-gradient(to bottom, #4a7a6a 1px, transparent 1px),
		linear-gradient(to bottom, #1a4d3a, #184534);
	background-size: var(--grid-width) var(--grid-height), var(--grid-width) var(--grid-height), 100% 100%;
	background-position:
		calc(var(--spread-left) + var(--grid-width) / 2) var(--spread-top),
		calc(var(--spread-left) + var(--grid-width) / 2) var(--spread-top),
		0 0;
}

.preview-pane.fullscreen {
	position: fixed;
	top: 0;
	left: 0;
	width: 100vw;
	height: 100dvh;
	z-index: 9999;
}

.preview-pane.fullscreen .spread-nav {
	padding-bottom: calc(12px + env(safe-area-inset-bottom));
}

.editor-pane.hidden {
	display: none;
}

#editor {
	width: 100%;
	height: 100%;
	font-family: monospace;
	font-size: 21px;
	outline: none;
}

.editor-pane:focus,
.editor-pane:focus-within {
	outline: none;
}

/* CodeMirror styling */
.cm-editor {
	width: 100%;
	height: 100%;
	background: var(--editor-bg);
	color: var(--text-color);
}

.cm-placeholder {
	color: #666;
	opacity: 0.6;
}

.cm-content {
	padding: 15px;
	font-size: 21px;
	line-height: 1.6;
}

.cm-gutters {
	font-size: 21px;
	line-height: 1.6;
	user-select: none;
}

.cm-lineNumbers .cm-gutterElement {
	line-height: 1.6;
	font-size: 21px;
}

.ͼ1 .cm-lineNumbers .cm-gutterElement {
	padding-right: 0;
	padding-left: 8px;
}

.cm-focused {
	outline: none;
}

/* Remove any focus rings/borders from CodeMirror elements */
.cm-editor,
.cm-editor *,
.cm-editor *:focus,
.cm-scroller,
.cm-scroller:focus,
.cm-content,
.cm-content:focus {
	outline: none !important;
	box-shadow: none !important;
}

/* Remove any focus indicators from CodeMirror gutters */
.cm-gutters {
	border-right: none !important;
}

/* Hide the selection layer border that can appear on the right edge */
.cm-selectionLayer {
	border: none !important;
}

/* Target the focus ring that appears next to scrollbar */
.cm-scroller:focus-visible,
.cm-editor:focus-visible,
.cm-content:focus-visible {
	outline: none !important;
}

/* Ensure no focus styling on any focusable element within editor */
#editor *:focus {
	outline: none !important;
	box-shadow: none !important;
	border-color: transparent !important;
}

/* Remove macOS focus ring */
#editor {
	-webkit-focus-ring-color: transparent;
}

#editor *:focus {
	-webkit-focus-ring-color: transparent;
}

.cm-editor .cm-content,
.cm-editor .cm-line,
.cm-editor {
	tab-size: 2 !important;
	-moz-tab-size: 2 !important;
}

.cm-editor, .cm-content, .cm-scroller, .cm-scrollElement {
	overscroll-behavior: none !important;
}

.cm-search button {
	display: none !important;
}

.cm-search {
	background-color: #16181b;
}

.cm-search label {
	display: none !important;
}

.cm-search input[name="replace"] {
	display: none !important;
}

.cm-search input[name="search"] {
	font-size: 21px !important;
	width: 100% !important;
	border-radius: 50px !important;
	padding-left: 0.8em !important;
	padding-right: 0.8em !important;
	padding-bottom: 7px !important;
}

.cm-panels-bottom {
	border-radius: 0px !important;
	border-top: none !important;
}

/* Font picker dropdown */
.font-picker-dropdown {
	position: absolute;
	z-index: 100;
	background: #1e2126;
	border: 1px solid #3a3f47;
	border-radius: 6px;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
	width: max-content;
}

.font-picker-dropdown ul {
	list-style: none;
	margin: 0;
	padding: 0;
	max-height: 260px;
	overflow-y: auto;
	overflow-x: hidden;
	scrollbar-width: thin;
	scrollbar-color: #555 transparent;
}

.font-picker-dropdown li {
	padding: 4px 10px;
	color: #e0e0e0;
	font-family: monospace;
	font-size: 16px;
	cursor: pointer;
	white-space: nowrap;
}

.font-picker-dropdown li.selected {
	background: #2a5a3a;
	color: #fff;
}

/* Preview iframe */
#preview {
	flex: 1;
	width: 100%;
	border: none;
	overflow: hidden;
}

/* Spread navigation controls */
.spread-nav {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 12px 20px;
}

.spread-nav button {
	background:
		linear-gradient(to bottom, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0.15));
	color: white;
	text-shadow: 0 1px 1px rgba(0, 0, 0, 0.4);
	border: none;
	border-radius: 50%;
	width: 36px;
	height: 36px;
	padding: 0;
	cursor: pointer;
	font-size: 18px;
	transition: opacity 0.2s, filter 0.2s;
	-webkit-tap-highlight-color: transparent;
	display: flex;
	align-items: center;
	justify-content: center;
	backdrop-filter: blur(8px);
	-webkit-backdrop-filter: blur(8px);
	box-shadow:
		0 1px 3px rgba(0, 0, 0, 0.3),
		inset 0 1px 0 rgba(255, 255, 255, 0.15),
		inset 0 -1px 1px rgba(0, 0, 0, 0.08);
}

@media (hover: hover) {
	.spread-nav button:hover:not(:disabled) {
		opacity: 1;
		filter: brightness(1.15);
	}
}

.spread-nav button:disabled {
	opacity: 0.25;
	cursor: default;
}

#spreadIndicator {
	color: white;
	font-size: 16px;
	min-width: 110px;
	text-align: center;
	text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Vertical layout for narrow screens */
@media (max-aspect-ratio: 1/1) {
	body {
		flex-direction: column;
	}

	.editor-pane {
		width: 100%;
		height: 50%;
		order: 2;
	}

	.preview-pane {
		width: 100%;
		height: 50%;
		order: 1;
		padding-top: env(safe-area-inset-top);
	}
}


/* Compact height: fullscreen editor */
@media (max-height: 270px) {
	.preview-pane {
		display: none;
	}

	.editor-pane {
		width: 100%;
	}
}

/* Mobile: fullscreen editor when keyboard is open */
@media (pointer: coarse), (pointer: none) {
	body.mobile-keyboard-open .preview-pane {
		display: none;
	}

	body.mobile-keyboard-open .editor-pane {
		position: fixed;
		top: calc(var(--visual-viewport-offset-top, 0px));
		left: 0;
		width: 100%;
		height: var(--visual-viewport-height, 100%);
		max-height: var(--visual-viewport-height, 100%);
		order: 1;
		overscroll-behavior: none;
		overflow: hidden;
	}

	body.mobile-keyboard-open .editor-pane #editor,
	body.mobile-keyboard-open .editor-pane .cm-editor {
		height: 100% !important;
		max-height: 100% !important;
	}
}

/* Print: hide editor UI and let iframe print its content */
@media print {
	.editor-pane, .spread-nav {
		display: none !important;
	}

	.preview-pane {
		width: 100% !important;
		height: 100% !important;
		position: absolute !important;
		top: 0 !important;
		left: 0 !important;
	}

	#preview {
		width: 100% !important;
		height: 100% !important;
	}
}