/* ==========================================================================
	1. RESET STYLES & PAGE STRUCTURE
	========================================================================== */
* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	background-color: #f8fafc;
	color: #0f172a;
	padding: 20px;
	display: flex;
	flex-direction: column;
	gap: 24px;
	align-items: center;

	min-height: -webkit-fill-available;
	height: 100dvh;

	overflow: hidden; /* Prevent global page scrolling */
}

pre {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.hidden {
	display: none !important;
}

/* ==========================================================================
	2. PAGE HEADER
	========================================================================== */
header {
	width: 100%;
	max-width: 1000px;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 16px 24px;
	background-color: #ffffff;
	border-radius: 12px;
	border: 1px solid #e2e8f0;
	box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
	flex-shrink: 0; /* Header never shrinks */
}

/* "Back" button in the header (link-style with no background) */
.wrapper-left button, .wrapper-right button {
	background: none !important;
	border: none !important;
	padding: 0 !important;
	color: #0284c7;
	font-weight: 500;
	font-size: 1rem;
	cursor: pointer;
	transition: color 0.2s;
}

.wrapper-left button:hover {
	color: #0369a1;
}

header h2 {
	font-size: 1.25rem;
	font-weight: 600;
	color: #1e293b;
}

.wrapper-right {
	width: 50px; /* Increased slightly for visual balance with the Back button */
}

/* ==========================================================================
	3. PANEL ARCHITECTURE (SPA LOGIC)
	========================================================================== */
.frame-wrapper {
	width: 100%;
	max-width: 1000px;
	flex-grow: 1; 
	min-height: 0;
	display: none; /* Hide all panels by default */
}

.frame-wrapper.active {
	display: flex; 
	flex-direction: column;
}

.frame {
	background-color: #ffffff;
	border-radius: 16px;
	padding: 24px;
	border: 1px solid #e2e8f0;
	box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
	height: 100%;
	display: flex;
	flex-direction: column;
}

/* Specific container for the card editing screen */
.frame.edit-card {
	gap: 20px;
}

/* Card name heading inside the edit screen */
.frame.edit-card > h2 {
	font-size: 1.4rem;
	font-weight: 600;
	color: #0f172a;
	padding-bottom: 12px;
	border-bottom: 2px solid #f1f5f9;
	flex-shrink: 0; /* Header stays fixed at the top, never shrinks */
	margin: 0;
	outline: none;
}


/* Scroll container for multiple editors */
.text-list {
	display: flex;
	flex-direction: column;
	gap: 24px;
	flex-grow: 1;
	overflow-y: auto; /* Independent vertical scroll for cards */
	padding-right: 4px;
}

/* ==========================================================================
	4. EDITOR COMPONENT & TEXT AREA
	========================================================================== */
.editor {
	display: flex;
	flex-direction: column;
	gap: 12px;
	flex-shrink: 0; /* Cards in the list do not shrink */
}

/* If the editor is the only element on the screen (first frame) */
.frame > .editor {
	height: 100%;
}

/* Title + Delete button on the same level */
.editor .title {
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-shrink: 0;
}

.editor .title h3 {
	font-size: 1.1rem;
	color: #64748b;
	outline: none;
}

/* Text working area (contenteditable) */
.editor .text {
	background-color: #ffffff;
	padding: 16px;
	border-radius: 8px;
	border: 1px solid #e2e8f0;
	line-height: 1.8; /* Increased line-height for better <ruby> positioning */
	color: #334155;
	outline: none;

	white-space: pre-wrap;
	word-break: break-word;
	overflow-wrap: break-word;
	
	/* Height restriction for fields inside the list */
	max-height: 200px;
	overflow-y: auto;
}

.editor [contenteditable].text {
	background-color: #f1f5f9;
}

/* If the field is the only one on the screen, allow it to take maximum space */
.frame > .editor .text {
	flex-grow: 1;
	max-height: none;
}

/* Keep visual stability during text input (no blue borders/outlines) */
.editor .text:focus {
	outline: none;
	background-color: #f1f5f9;
	border-color: #e2e8f0;
	box-shadow: none;
}

/* ==========================================================================
	5. TEACHER REVIEW EFFECT ("RED PEN")
	========================================================================== */

/* Deleted text: original word color (dark), strikethrough line is RED */
.editor .text del {
	color: inherit;
	text-decoration: line-through;
	text-decoration-color: #dc2626;
	text-decoration-thickness: 2px;
}

.editor .text u {
	text-decoration: underline solid red;
}

/* Inserted text / teacher's notes: completely RED */
.editor .text ins {
	color: #dc2626;
	text-decoration: none;
	font-weight: inherit;
}

/* Container for the correct variation above the error */
.editor .text ruby {
	ruby-position: over;
	ruby-align: center;
}

/* Red teacher's note above the word */
.editor .text rt {
	font-size: 0.75rem;
	color: #dc2626;
	font-weight: 600;
	padding-bottom: 4px;
	user-select: none; /* Prevent accidental mouse selection */
}

/* ==========================================================================
	6. BUTTONS & CONTROLS
	========================================================================== */
.controls {
	flex-shrink: 0;
	display: flex;
	gap: 12px;
	justify-content: flex-end;
}

/* Global settings for absolutely all buttons */
button {
	font-family: inherit;
	color: white;
	border: none;
	border-radius: 8px;
	font-weight: 600;
	cursor: pointer;
	transition: background-color 0.2s, transform 0.1s;
}

button:active {
	transform: scale(0.98);
}

/* Large standard buttons in action panels (e.g., Ok) */
.controls button {
	padding: 12px 24px;
	background-color: #2563eb;
}

.controls button:hover {
	background-color: #1d4ed8;
}

/* Button styling based on unique classes */
.action-add-text {
	background-color: #10b981 !important; /* Green for Add */
}

.action-add-text:hover {
	background-color: #059669 !important;
}

.action-save-text {
	background-color: #2563eb !important; /* Blue for Save */
}

.action-save-text:hover {
	background-color: #1d4ed8 !important;
}

/* Compact red Delete button inside .title */
.editor .title button {
	padding: 6px 14px;
	font-size: 0.85rem;
	background-color: #ef4444;
}

.editor .title button:hover {
	background-color: #dc2626;
}

/* ==========================================================================
	7. NAVIGATION CARDS & MENU
	========================================================================== */
/* The main menu frame container */
.frame.menu {
	gap: 20px;
}

/* Scroll container for multiple cards */
.card-list {
	display: flex;
	flex-direction: column;
	gap: 12px;
	flex-grow: 1;
	overflow-y: auto; /* Independent vertical scroll for the cards list */
	padding-right: 4px;
}

/* Individual navigation card */
.card {
	background-color: #f8fafc;
	padding: 14px 20px;
	border-radius: 10px;
	border: 1px solid #e2e8f0;
	display: flex;
	justify-content: space-between;
	align-items: center;
	transition: background-color 0.2s, transform 0.2s, border-color 0.2s;
	cursor: pointer;
	flex-shrink: 0; /* Cards do not shrink when the list grows */
}

.card:hover {
	background-color: #f1f5f9;
	border-color: #cbd5e1;
	transform: translateY(-1px);
}

.card h3 {
	font-size: 1rem;
	font-weight: 500;
	color: #334155;
}

/* Compact Edit button inside individual card controls */
.card .controls button.action-edit-text {
	padding: 6px 14px;
	font-size: 0.85rem;
	background-color: #64748b; /* Neutral slate color for edit action */
}

.card .controls button.action-edit-text:hover {
	background-color: #475569;
}

.trainer .controls {
	justify-content: space-evenly;
	flex-wrap: wrap;
}