/* ================= BASE THEME ================= */
:root {
	/* Primary colors */
	--primary-color: #5e4b8b;
	--primary-light: #8a77b5;
	--primary-dark: #3b2e63;

	/* Secondary colors */
	--secondary-color: #444444;
	--secondary-dark: #222222;

	/* Text colors */
	--text-color: #333333;
	--dark-text: #111111;
	--light-text: #666666;
	--editor-text: #d4d4d4;
	--white-text: #ffffff;

	/* Background colors */
	--bg-color: #f8f7fc;
	--panel-bg: #ffffff;
	--code-bg: #f7f5fa;
	--editor-bg: #1e1e1e;
	--editor-highlight: #303030;

	/* Border colors */
	--border-color: #e0e0e0;

	/* Status colors */
	--info-color: #7a93fe;
	--success-color: #58b890;
	--success-color-dark: #3d8d6a;
	--success-color-light: #a3e6c8;
	--error-color: #cb6e75;
	--danger-color: #dc3545;

	/* Special colors */
	--primary-bg-light: rgba(94, 75, 139, 0.05);
	--primary-bg-medium: rgba(94, 75, 139, 0.1);
	--primary-bg-instruction: rgba(125, 92, 203, 0.9);
	--success-bg-light: rgba(88, 184, 144, 0.15);
	--modal-bg: rgba(0, 0, 0, 0.5);

	/* Typography */
	--font-main: "Inter", "Segoe UI", Roboto, sans-serif;
	--font-code: "JetBrains Mono", "Fira Code", monospace;

	/* Effects */
	--shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
	--shadow-modal: 0 4px 20px rgba(0, 0, 0, 0.15);

	/* Sizes */
	--header-height: 50px;
	--sidebar-width: 280px;
	--border-radius-sm: 4px;
	--border-radius-md: 6px;
	--border-radius-lg: 8px;
	--spacing-xs: 0.5rem;
	--spacing-sm: 0.75rem;
	--spacing-md: 1rem;
	--spacing-lg: 1.5rem;
}

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

/* ================= ACCESSIBILITY ================= */
.skip-link {
	position: absolute;
	top: -100%;
	left: 16px;
	padding: 8px 16px;
	background: var(--primary-dark);
	color: var(--white-text);
	text-decoration: none;
	border-radius: var(--border-radius-sm);
	z-index: 10000;
	transition: top 0.2s ease;
}

.skip-link:focus {
	top: 8px;
}

/* Focus styles - let browser defaults handle most cases */
/* Only enhance for our interactive elements */

/* ================= BASE STYLES ================= */
body {
	font-family: var(--font-main);
	background-color: var(--bg-color);
	color: var(--text-color);
	line-height: 1.5;
	overflow: hidden;
}

code,
kbd {
	font-family: var(--font-code);
}

/* ================= APP CONTAINER ================= */
.app-container {
	display: flex;
	flex-direction: column;
	height: 100vh;
	overflow: hidden;
}

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

.menu-toggle {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 32px;
	height: 32px;
	background: none;
	border: none;
	cursor: pointer;
	padding: 4px;
	border-radius: var(--border-radius-sm);
}

.menu-toggle:hover {
	background: var(--primary-bg-light);
}

.hamburger-icon {
	position: relative;
	width: 18px;
	height: 2px;
	background-color: var(--text-color);
	border-radius: 1px;
}

.hamburger-icon::before,
.hamburger-icon::after {
	content: "";
	position: absolute;
	left: 0;
	width: 100%;
	height: 2px;
	background-color: var(--text-color);
	border-radius: 1px;
}

.hamburger-icon::before {
	top: -6px;
}

.hamburger-icon::after {
	top: 6px;
}

.logo {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	text-decoration: none;
	cursor: pointer;
}

.logo h1 {
	font-size: 1rem;
	font-weight: 800;
	color: var(--text-color);
	line-height: 1;
	display: flex;
	align-items: center;
	gap: 0.15rem;
}

.logo h1 .code-text {
	background: var(--primary-color);
	color: white;
	padding: 0.15rem 0.35rem;
	border-radius: 4px;
	letter-spacing: 0.05em;
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.logo h1 span:last-child {
	color: var(--primary-color);
}

.help-toggle {
	width: 28px;
	height: 28px;
	border-radius: 50%;
	border: 2px solid var(--border-color);
	background: none;
	font-weight: bold;
	cursor: pointer;
	color: var(--light-text);
	transition: all 0.2s;
}

.help-toggle:hover {
	border-color: var(--primary-color);
	color: var(--primary-color);
}

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

/* Path Indicator Pill */
.path-indicator {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	background: var(--primary-bg-medium);
	color: var(--primary-color);
	padding: 6px 12px;
	border-radius: 16px;
	border: none;
	font-size: 0.8rem;
	font-weight: 600;
	cursor: pointer;
	transition: all 0.2s;
	max-width: 200px;
}

.path-indicator:hover {
	background: var(--primary-bg-light);
	transform: translateY(-1px);
	box-shadow: 0 2px 4px rgba(94, 75, 139, 0.15);
}

.path-indicator-name {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	text-transform: uppercase;
	letter-spacing: 0.5px;
}

.path-indicator-progress {
	color: var(--primary-dark);
	font-weight: 700;
	opacity: 0.9;
	font-size: 0.75rem;
}

/* ================= GAME LAYOUT ================= */
.game-layout {
	display: flex;
	flex: 1;
	min-height: 0;
	overflow: hidden;
	transition: transform 0.3s ease;
}

/* ================= LEFT PANEL ================= */
.left-panel {
	width: 50%;
	display: flex;
	flex-direction: column;
	border-right: 1px solid var(--border-color);
	background: var(--panel-bg);
	min-height: 0;
}

.instructions {
	padding: var(--spacing-md);
	border-bottom: 1px solid var(--border-color);
	max-height: calc(50vh - 60px);
	overflow-y: auto;
}

/* Smooth lesson transition */
#lesson-title,
.lesson-description,
.task-instruction {
	transition: opacity 0.1s ease;
}

.editor-section.transitioning #lesson-title,
.editor-section.transitioning .lesson-description,
.editor-section.transitioning .task-instruction {
	opacity: 0.3;
}

/* Loading fallback notice */
.loading-fallback {
	text-align: center;
	padding: 3rem 1rem;
	color: var(--light-text);
	animation: fadeIn 0.5s ease;
}

.loading-fallback p {
	margin-bottom: 1rem;
}

@keyframes fadeIn {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

.module-pill {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	background: var(--primary-bg-medium);
	color: var(--primary-color);
	padding: 4px 12px;
	border-radius: 16px;
	font-size: 0.8rem;
	font-weight: 600;
	min-width: 0;
	flex-shrink: 1;
}

.module-name {
	text-transform: uppercase;
	letter-spacing: 0.5px;
}

.module-pill .level-indicator {
	color: var(--primary-dark);
	font-weight: 500;
	opacity: 0.8;
}

#lesson-title {
	font-size: 1.25rem;
	color: var(--primary-dark);
	margin-bottom: var(--spacing-sm);
}

.completion-badge {
	display: inline-block;
	margin-left: 0.5rem;
	padding: 0.15rem 0.5rem;
	background: var(--success-color);
	color: white;
	font-size: 0.7rem;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.5px;
	border-radius: var(--border-radius-sm);
	vertical-align: middle;
}

.lesson-description {
	font-size: 0.95rem;
	line-height: 1.6;
	color: var(--text-color);
	margin-top: var(--spacing-lg);
	margin-bottom: var(--spacing-md);
}

.lesson-description kbd,
.lesson-description code {
	background: var(--primary-bg-medium);
	padding: 2px 6px;
	border-radius: 3px;
	font-size: 0.85rem;
}

.lesson-description pre {
	background: var(--code-bg);
	padding: var(--spacing-md);
	border-radius: var(--border-radius-sm);
	overflow-x: auto;
	font-size: 0.85rem;
	margin: var(--spacing-sm) 0;
}

.task-instruction {
	background: var(--primary-bg-instruction);
	color: var(--white-text);
	padding: var(--spacing-sm) var(--spacing-md);
	border-radius: var(--border-radius-sm);
	font-size: 0.9rem;
	line-height: 1.6;
}

.task-instruction kbd,
.task-instruction code {
	background: rgba(255, 255, 255, 0.25);
	padding: 2px 8px;
	border-radius: 4px;
	font-size: 0.9em;
	font-weight: 500;
}

/* ================= CONCEPT SECTION ================= */
.concept-section {
	margin-top: var(--spacing-lg);
	padding: var(--spacing-md);
	background: var(--primary-bg-light);
	border: 1px solid var(--primary-bg-medium);
	border-left: 3px solid var(--primary-color);
	border-radius: var(--border-radius-md);
	transition: background 0.2s ease;
}

.concept-section:hover {
	background: var(--primary-bg-medium);
}

.concept-section[open] {
	background: var(--primary-bg-medium);
}

.concept-summary {
	cursor: pointer;
	font-weight: 600;
	font-size: 0.9rem;
	color: var(--primary-dark);
	list-style: none;
	user-select: none;
	padding: var(--spacing-xs) 0;
	display: flex;
	align-items: center;
	gap: var(--spacing-xs);
}

.concept-summary::-webkit-details-marker {
	display: none;
}

.concept-summary::before {
	content: "▶";
	display: inline-block;
	font-size: 0.7rem;
	transition: transform 0.2s ease;
	color: var(--primary-color);
}

.concept-section[open] .concept-summary::before {
	transform: rotate(90deg);
}

.concept-summary:hover {
	color: var(--primary-color);
}

.concept-content {
	margin-top: var(--spacing-md);
	padding-top: var(--spacing-sm);
	border-top: 1px solid var(--border-color);
	animation: concept-expand 0.3s ease;
}

@keyframes concept-expand {
	from {
		opacity: 0;
		transform: translateY(-8px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.concept-explanation {
	font-size: 0.9rem;
	line-height: 1.6;
	color: var(--text-color);
	margin-bottom: var(--spacing-md);
}

.concept-explanation:empty {
	display: none;
	margin-bottom: 0;
}

.concept-diagram {
	background: var(--panel-bg);
	padding: var(--spacing-md);
	border-radius: var(--border-radius-sm);
	border: 1px solid var(--border-color);
	font-family: var(--font-code);
	font-size: 0.85rem;
	line-height: 1.4;
	color: var(--text-color);
	overflow-x: auto;
	white-space: pre;
	margin-bottom: var(--spacing-md);
}

.concept-diagram:empty {
	display: none;
	margin-bottom: 0;
}

.concept-container-vs-item {
	background: var(--success-bg-light);
	padding: var(--spacing-sm) var(--spacing-md);
	border-radius: var(--border-radius-sm);
	border-left: 3px solid var(--success-color);
	font-size: 0.85rem;
	line-height: 1.6;
	color: var(--text-color);
}

.concept-container-vs-item:empty {
	display: none;
}

.concept-container-vs-item strong {
	color: var(--success-color-dark);
	font-weight: 600;
}

/* ================= EDITOR SECTION ================= */
.editor-section {
	flex: 1;
	display: flex;
	flex-direction: column;
	min-height: 50vh;
	position: relative;
}

/* Playground mode - full height editor */
.editor-section.playground-mode {
	flex: 1;
	min-height: 0;
}

.code-editor {
	flex: 1;
	display: flex;
	flex-direction: column;
	min-height: 0;
}

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

.editor-label {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--light-text);
}

.editor-actions {
	display: flex;
	align-items: center;
	gap: var(--spacing-sm);
}

.editor-content {
	flex: 1;
	display: flex;
	flex-direction: column;
	min-height: 0;
	background: var(--editor-bg);
	overflow: hidden;
}

/* CodeMirror container styles */
.editor-content .cm-editor {
	flex: 1;
	height: 100%;
}

.editor-content .cm-scroller {
	overflow: auto;
}

/* Legacy textarea (fallback) */
.code-input {
	flex: 1;
	width: 100%;
	padding: var(--spacing-md);
	background: var(--editor-bg);
	color: var(--editor-text);
	border: none;
	font-family: var(--font-code);
	font-size: 14px;
	line-height: 1.5;
	resize: none;
	outline: none;
}

.code-input::placeholder {
	color: #666;
}

/* ================= HINT AREA ================= */
.hint-area {
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	padding: var(--spacing-sm) var(--spacing-md);
	background: rgba(30, 30, 30, 0.9);
	backdrop-filter: blur(4px);
	z-index: 5;
}

.hint-area:empty {
	display: none;
}

.hint {
	display: flex;
	align-items: center;
	gap: var(--spacing-sm);
	padding: var(--spacing-xs) var(--spacing-sm);
	background: rgba(94, 75, 139, 0.3);
	border-left: 3px solid var(--primary-light);
	border-radius: var(--border-radius-sm);
	color: var(--editor-text);
}

.hint-progress {
	background: var(--primary-color);
	color: white;
	padding: 2px 8px;
	border-radius: 10px;
	font-size: 0.75rem;
	font-weight: bold;
	flex-shrink: 0;
}

.hint-message {
	font-size: 0.9rem;
	color: var(--editor-text);
}

.hint-message kbd,
.hint-message code {
	background: rgba(255, 255, 255, 0.15);
	color: #fff;
	padding: 2px 6px;
	border-radius: 3px;
	font-size: 0.85rem;
	font-family: var(--font-code);
}

.hint-success {
	background: var(--success-bg-light);
	border-left-color: var(--success-color);
}

.hint-success .hint-progress {
	background: var(--success-color);
}

/* ================= RIGHT PANEL ================= */
.right-panel {
	width: 50%;
	display: flex;
	flex-direction: column;
	background: var(--bg-color);
	min-height: 0;
}

.preview-section {
	flex: 1;
	display: flex;
	flex-direction: column;
	min-height: 0;
}

.preview-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: var(--spacing-xs) var(--spacing-md) var(--spacing-md);
	background: transparent;
}

.preview-label {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--light-text);
}

.preview-wrapper {
	flex: 1;
	position: relative;
	background: var(--panel-bg);
	margin: var(--spacing-md);
	border-radius: var(--border-radius-md);
	box-shadow: var(--shadow);
	overflow: hidden;
	min-height: 0;
}

.preview-frame {
	width: 100%;
	height: 100%;
	padding: var(--spacing-sm);
}

.preview-frame iframe {
	width: 100%;
	height: 100%;
	border: none;
	border-radius: var(--border-radius-sm);
}

/* Expected Overlay (toggleable) */
.expected-overlay {
	position: absolute;
	inset: 0;
	background: var(--panel-bg);
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.3s ease;
	display: flex;
	align-items: center;
	justify-content: center;
}

.expected-overlay.visible {
	opacity: 1;
	pointer-events: auto;
}

.expected-frame {
	width: 100%;
	height: 100%;
	padding: var(--spacing-sm);
}

.expected-frame iframe {
	width: 100%;
	height: 100%;
	border: none;
	border-radius: var(--border-radius-sm);
}

/* Success Match Animation */
.preview-wrapper.matched {
	box-shadow: 0 0 0 3px var(--success-color);
}

.preview-wrapper.matched::after {
	content: "CRISPY ٩( ◕‿◕ )۶";
	position: absolute;
	background: var(--success-color-dark);
	color: white;
	padding: var(--spacing-sm) var(--spacing-lg);
	border-radius: var(--border-radius-lg);
	font-weight: bold;
	font-size: 1.3rem;
	animation: dvd-bounce 8s ease-in-out infinite;
	z-index: 10;
	white-space: nowrap;
}

@keyframes dvd-bounce {
	0% {
		top: 15%;
		left: 15%;
		transform: translate(-50%, -50%) scale(1);
	}
	25% {
		top: 75%;
		left: 85%;
		transform: translate(-50%, -50%) scale(1.1);
	}
	50% {
		top: 25%;
		left: 75%;
		transform: translate(-50%, -50%) scale(0.95);
	}
	75% {
		top: 70%;
		left: 20%;
		transform: translate(-50%, -50%) scale(1.05);
	}
	100% {
		top: 15%;
		left: 15%;
		transform: translate(-50%, -50%) scale(1);
	}
}

/* ================= GAME CONTROLS ================= */
.game-controls {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: var(--spacing-md);
	background: var(--panel-bg);
	border-bottom: 1px solid var(--border-color);
	box-shadow: 0 10px 20px -10px rgba(0, 0, 0, 0.08);
}

/* ================= SIDEBAR ================= */
.sidebar-backdrop {
	position: fixed;
	inset: 0;
	background: rgba(0, 0, 0, 0.4);
	opacity: 0;
	visibility: hidden;
	transition:
		opacity 0.3s,
		visibility 0.3s;
	z-index: 199;
}

.sidebar-backdrop.visible {
	opacity: 1;
	visibility: visible;
}

.sidebar-drawer {
	position: fixed;
	left: calc(-1 * var(--sidebar-width));
	top: 0;
	width: var(--sidebar-width);
	height: 100vh;
	background: var(--panel-bg);
	box-shadow: var(--shadow-modal);
	transition: left 0.3s ease;
	z-index: 200;
	display: flex;
	flex-direction: column;
	overflow: hidden;
}

.sidebar-drawer.open {
	left: 0;
}

/* Shift main content when sidebar is open */
.app-container:has(.sidebar-drawer.open) .game-layout {
	transform: translateX(calc(var(--sidebar-width) * 0.8));
}

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

.sidebar-header h3 {
	font-size: 1.1rem;
	color: var(--primary-dark);
}

.close-btn {
	width: 32px;
	height: 32px;
	border: none;
	background: none;
	font-size: 1.5rem;
	cursor: pointer;
	color: var(--light-text);
	border-radius: var(--border-radius-sm);
}

.close-btn:hover {
	background: var(--primary-bg-light);
	color: var(--primary-color);
}

.sidebar-section {
	padding: var(--spacing-md);
	border-bottom: 1px solid var(--border-color);
}

.sidebar-section:last-child {
	border-bottom: none;
}

/* Make the lessons nav section fill available space */
nav.sidebar-section {
	flex: 1;
	overflow-y: auto;
	min-height: 0;
}

.sidebar-section h4 {
	font-size: 0.75rem;
	text-transform: uppercase;
	letter-spacing: 1px;
	color: var(--light-text);
	margin-bottom: var(--spacing-sm);
}

/* Progress Display */
.progress-display {
	display: flex;
	flex-direction: column;
	gap: var(--spacing-xs);
}

.progress-bar {
	height: 8px;
	background: var(--border-color);
	border-radius: 4px;
	overflow: hidden;
}

.progress-fill {
	height: 100%;
	background: var(--primary-color);
	transition: width 0.3s ease;
}

.progress-text {
	font-size: 0.75rem;
	color: var(--light-text);
	text-align: right;
}

/* Lesson list nav */
.lesson-list {
	display: flex;
	flex-direction: column;
	gap: var(--spacing-xs);
	list-style: none;
}

.lesson-item {
	padding: var(--spacing-xs) var(--spacing-sm);
	background: transparent;
	border: none;
	border-radius: var(--border-radius-sm);
	color: var(--text-color);
	cursor: pointer;
	text-align: left;
	font-size: 0.9rem;
	transition: all 0.2s;
	display: flex;
	align-items: center;
	gap: var(--spacing-xs);
}

.lesson-item:hover {
	background: var(--primary-bg-light);
	color: var(--primary-color);
}

.lesson-item.active {
	background: var(--primary-bg-medium);
	color: var(--primary-dark);
	font-weight: 600;
}

.lesson-item.completed::before {
	content: "✓";
	color: var(--success-color);
	font-weight: bold;
}

/* ================= RESPONSIVE ================= */
@media (max-width: 1024px) {
	.left-panel {
		width: 40%;
	}

	.right-panel {
		width: 60%;
	}
}

@media (max-width: 768px) {
	.left-panel,
	.right-panel {
		display: none;
	}

	.game-layout {
		flex-direction: column;
	}

	.editor-section {
		width: 100%;
	}

	.preview-section {
		display: none;
	}

	.menu-toggle {
		display: flex;
	}
}

@media (max-width: 480px) {
	.header {
		padding: 0 var(--spacing-sm);
	}

	.preview-wrapper {
		margin: var(--spacing-sm);
	}

	.hint {
		font-size: 0.85rem;
	}

	.logo h1 {
		font-size: 0.9rem;
	}

	.instructions {
		max-height: calc(60vh - 60px);
	}
}

/* ================= ANIMATIONS ================= */
@keyframes slideIn {
	from {
		opacity: 0;
		transform: translateX(-20px);
	}
	to {
		opacity: 1;
		transform: translateX(0);
	}
}

@keyframes pulse {
	0% {
		box-shadow: 0 0 0 0 rgba(94, 75, 139, 0.4);
	}
	70% {
		box-shadow: 0 0 0 10px rgba(94, 75, 139, 0);
	}
	100% {
		box-shadow: 0 0 0 0 rgba(94, 75, 139, 0);
	}
}

/* ================= UTILITY CLASSES ================= */
.hidden {
	display: none !important;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border-width: 0;
}

.no-scroll {
	overflow: hidden;
}