:root {
	--accent: #4361ee;
	--primary: #4361ee;
	--primary-dark: #3a56d4;
	--secondary: #ff6b6b;
	--secondary-dark: #ee5a5a;
	--success: #06d6a0;
	--warning: #ffd166;
	--text: #2d3748;
	--text-light: #718096;
	--bg: #f8f9fa;
	--bg-card: #ffffff;
	--bg-drawer: #ffffff;
	--bg-modal: #ffffff;
	--shadow: rgba(0, 0, 0, 0.1);
	--transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
	--border-radius: 16px;
}

.dark-mode {
	--primary: #5e72e4;
	--primary-dark: #4d5fd0;
	--secondary: #ff7b7b;
	--secondary-dark: #ff6b6b;
	--success: #07e6a9;
	--warning: #ffd166;
	--text: #e2e8f0;
	--text-light: #a0aec0;
	--bg: #1a202c;
	--bg-card: #2d3748;
	--bg-drawer: #2d3748;
	--bg-modal: #2d3748;
	--shadow: rgba(0, 0, 0, 0.25);
}

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

body {
	background-color: var(--bg);
	color: var(--text);
	font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
	line-height: 1.6;
	transition: var(--transition);
	min-height: 100vh;
}

.hidden {
	display: none !important;
}

.container {
	max-width: 1200px;
	margin: 0 auto;
	padding: 20px;
}

.header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 30px;
	padding-bottom: 15px;
	border-bottom: 1px solid var(--text-light);
	opacity: 0.9;
}

.header > div {
    display: flex;
    align-items: center;
}

.logo {
    width: 50px;
    height: 50px;
    background: url('favicon.png') no-repeat center center;
    background-size: contain;
    margin-right: 15px;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success);
    color: white;
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 10000;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

.notification.show {
    transform: translateX(0);
}

.notification i {
    font-size: 1.2rem;
}

h1,
h2,
h3 {
	color: var(--text);
	font-weight: 700;
}

h1 {
	font-size: 2.2rem;
	background: linear-gradient(135deg, var(--primary), var(--secondary));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
}

button {
	background-color: var(--primary);
	color: white;
	border: none;
	padding: 12px 20px;
	border-radius: var(--border-radius);
	cursor: pointer;
	font-size: 16px;
	font-weight: 600;
	transition: var(--transition);
	display: flex;
	align-items: center;
	gap: 8px;
}

button:hover {
	background-color: var(--primary-dark);
	transform: translateY(-2px);
	box-shadow: 0 4px 12px var(--shadow);
}

button:active {
	transform: translateY(0);
}

button.delete {
	background-color: var(--secondary);
}

button.delete:hover {
	background-color: var(--secondary-dark);
}

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

button.warning {
	background-color: var(--warning);
	color: #333;
}

.theme-toggle {
	background: none;
	border: none;
	color: var(--text);
	font-size: 1.5rem;
	cursor: pointer;
	padding: 8px;
	border-radius: 50%;
	width: 45px;
	height: 45px;
	display: flex;
	align-items: center;
	justify-content: center;
}

.theme-toggle:hover {
	background-color: var(--bg-card);
	transform: rotate(15deg);
}

.action-header-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
}

.action-header-buttons button {
    flex: 1;
    min-width: calc(33% - 7.5px);
}

.create-set-button {
	padding: 16px 24px;
	font-size: 1.1rem;
}

.sets-list {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
	gap: 25px;
    margin-top: 12.5px;
}

.set-card {
	background-color: var(--bg-card);
	padding: 25px;
	border-radius: var(--border-radius);
	box-shadow: 0 5px 15px var(--shadow);
	cursor: pointer;
	transition: var(--transition);
	position: relative;
	overflow: hidden;
	border-left: 6px solid var(--primary);
}

.set-card:hover {
	transform: translateY(-8px);
	box-shadow: 0 12px 25px var(--shadow);
}

.set-card h3 {
	margin-bottom: 10px;
	font-size: 1.4rem;
	display: flex;
	justify-content: space-between;
	align-items: center;
}

.set-card-actions {
	display: flex;
	gap: 10px;
}

.set-card-action-btn {
	background: none;
	border: none;
	color: var(--text-light);
	font-size: 1rem;
	cursor: pointer;
	padding: 5px;
	border-radius: 50%;
	width: 32px;
	height: 32px;
	display: flex;
	align-items: center;
	justify-content: center;
}

.set-card-action-btn:hover {
	background-color: var(--bg);
	color: var(--text);
}

.set-card p {
	color: var(--text-light);
	display: flex;
	align-items: center;
	gap: 8px;
	margin-bottom: 15px;
}

.set-card .description {
	margin-top: 10px;
	font-style: italic;
	color: var(--text-light);
	font-size: 0.9rem;
}

.set-card .category {
	display: inline-block;
	background-color: var(--primary);
	color: white;
	padding: 4px 10px;
	border-radius: 20px;
	font-size: 0.8rem;
	margin-top: 15px;
}

.modal-overlay {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-color: rgba(0, 0, 0, 0.7);
	z-index: 2000;
	backdrop-filter: blur(5px);
	animation: fadeIn 0.3s ease;
}

.fade-out {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.fade-in {
    opacity: 0;
    transform: scale(0.9);
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal {
	position: fixed;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%) scale(0.9);
	width: 90%;
	max-width: 500px;
	background-color: var(--bg-modal);
	border-radius: var(--border-radius);
	box-shadow: 0 10px 30px var(--shadow);
	z-index: 2001;
	padding: 30px;
	opacity: 0;
	transition: var(--transition);
}

.modal.open {
	opacity: 1;
	transform: translate(-50%, -50%) scale(1);
}

.modal-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 20px;
	padding-bottom: 15px;
	border-bottom: 1px solid var(--text-light);
}

.modal-close {
	background: none;
	border: none;
	font-size: 28px;
	color: var(--text-light);
	cursor: pointer;
	transition: var(--transition);
	width: 40px;
	height: 40px;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 50%;
}

.modal-close:hover {
	background-color: var(--bg);
	color: var(--text);
	transform: rotate(90deg);
}

.form-group {
	margin-bottom: 20px;
}

.form-group label {
	display: block;
	margin-bottom: 8px;
	font-weight: 600;
	color: var(--text);
	z-index: 1;
	position: relative;
}

.form-group input,
.form-group textarea,
.form-group select {
	width: 100%;
	padding: 14px;
	border: 2px solid var(--text-light);
	border-radius: var(--border-radius);
	font-size: 16px;
	background-color: var(--bg);
	color: var(--text);
	transition: var(--transition);
	position: relative;
	z-index: 1;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
	outline: none;
	border-color: var(--primary);
	box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.3);
}

.form-group textarea {
	min-height: 100px;
	resize: vertical;
}

.color-options {
	display: flex;
	gap: 10px;
	flex-wrap: wrap;
	margin-top: 10px;
	position: relative;
	z-index: 1;
}

.color-option {
	width: 30px;
	height: 30px;
	border-radius: 50%;
	cursor: pointer;
	transition: var(--transition);
	border: 2px solid transparent;
	position: relative;
	z-index: 1;
}

.color-option.selected {
	border-color: white;
	box-shadow: 0 0 0 2px var(--primary);
	transform: scale(1.1);
}

.app-overlay {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-color: rgba(0, 0, 0, 0.6);
	z-index: 1000;
	backdrop-filter: blur(4px);
	animation: fadeIn 0.3s ease;
}

.drawer {
	position: fixed;
	top: 0;
	right: -450px;
	width: 100%;
	max-width: 450px;
	height: 100%;
	background-color: var(--bg-drawer);
	box-shadow: -5px 0 25px var(--shadow);
	transition: right 0.4s cubic-bezier(0.23, 1, 0.32, 1);
	z-index: 1001;
	overflow-y: auto;
	padding: 25px;
	display: flex;
	flex-direction: column;
}

.drawer.open {
	right: 0;
}

.drawer-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 25px;
	padding-bottom: 15px;
	border-bottom: 1px solid var(--text-light);
	position: relative;
	z-index: 1;
}

.drawer-title {
	display: flex;
	flex-direction: column;
	gap: 5px;
	position: relative;
	z-index: 1;
}

.drawer-category {
	font-size: 0.9rem;
	color: var(--text-light);
	display: flex;
	align-items: center;
	gap: 5px;
}

.close-btn {
	background: none;
	border: none;
	font-size: 28px;
	color: var(--text-light);
	cursor: pointer;
	transition: var(--transition);
	width: 40px;
	height: 40px;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 50%;
	position: relative;
	z-index: 1;
}

.close-btn:hover {
	background-color: var(--bg);
	color: var(--text);
	transform: rotate(90deg);
}

.add-card-button {
	margin-bottom: 25px;
	width: 100%;
	display: flex;
	justify-content: center;
	align-items: center;
	gap: 10px;
	padding: 15px;
	background: linear-gradient(135deg, var(--primary), var(--primary-dark));
	border-radius: var(--border-radius);
	transition: var(--transition);
	position: relative;
	z-index: 1;
}

.add-card-button:hover {
	transform: translateY(-3px);
	box-shadow: 0 8px 20px var(--shadow);
}

.cards-list {
	margin-bottom: 25px;
	flex-grow: 1;
	position: relative;
	z-index: 1;
}

.card-item {
	background-color: var(--bg);
	padding: 18px;
	margin-bottom: 15px;
	border-radius: var(--border-radius);
	display: flex;
	justify-content: space-between;
	align-items: center;
	transition: var(--transition);
	animation: slideIn 0.3s ease;
	position: relative;
	z-index: 1;
}

@keyframes slideIn {
	from {
		opacity: 0;
		transform: translateX(20px);
	}

	to {
		opacity: 1;
		transform: translateX(0);
	}
}

.card-item:hover {
	transform: translateX(5px);
	box-shadow: 0 5px 15px var(--shadow);
}

.card-content {
	flex-grow: 1;
	cursor: pointer;
	position: relative;
	z-index: 1;
}

.card-question {
	font-weight: bold;
	margin-bottom: 5px;
}

.card-answer {
	color: var(--text-light);
	margin-bottom: 5px;
}

.card-hint {
	font-size: 0.85rem;
	color: var(--primary);
	font-style: italic;
	margin-top: 5px;
}

.card-actions {
	display: flex;
	gap: 10px;
	position: relative;
	z-index: 1;
}

.card-action-btn {
	background: none;
	border: none;
	color: var(--text-light);
	cursor: pointer;
	padding: 5px;
	border-radius: 4px;
	width: 32px;
	height: 32px;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: var(--transition);
}

.card-action-btn:hover {
	background-color: var(--bg-card);
	color: var(--text);
}

.training-container {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	height: 100vh;
	padding: 20px;
	background-color: var(--bg);
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	opacity: 0;
	visibility: hidden;
	transition: opacity 0.5s ease, visibility 0.5s ease;
	z-index: 3000;
	/* Disable Text Selection */
	user-select: none;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
}

.training-container.active {
	opacity: 1;
	visibility: visible;
}

#progress-text {
    position: relative;
    z-index: 20;
    text-align: center;
    margin-bottom: 10px;
    font-weight: bold;
    font-size: 1.2rem;
}

.progress-bar {
    position: relative;
    z-index: 20;
    width: 100%;
    max-width: 550px;
    height: 12px;
    background-color: var(--bg-card);
    border-radius: 10px;
    margin-bottom: 30px;
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow);
}

.flashcard-container {
	width: 100%;
	max-width: 550px;
	height: 350px;
	perspective: 1500px;
	margin-bottom: 40px;
    margin-top: -40px;
	position: relative;
	z-index: 10;
}
.training-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.progress {
	height: 100%;
	background: linear-gradient(to right, var(--primary), var(--success));
	border-radius: 10px;
	width: 0%;
	transition: width 0.5s cubic-bezier(0.23, 1, 0.32, 1);
}


.flashcard {
	width: 100%;
	height: 100%;
	border-radius: 20px;
	position: relative;
	transform-style: preserve-3d;
	cursor: grab;
	transition: transform 0.3s ease;
}

.flashcard.currentCard {
	margin-top: 0% !important;
}

.flashcard:not(:first-child) {
	margin-top: -86.2%;
	z-index: 1;
}

.flashcard.flipped .flashcard-inner {
	transform: rotateY(180deg);
}

.flashcard-inner {
	position: relative;
	width: 100%;
	height: 100%;
	text-align: center;
	transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
	transform-style: preserve-3d;
}

.flashcard-front,
.flashcard-back {
	position: absolute;
	width: 100%;
	height: 100%;
	backface-visibility: hidden;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 30px;
	border-radius: 16px;
	box-shadow: 0 10px 30px var(--shadow);
	background-color: var(--bg-card);
}

.flashcard-back {
	transform: rotateY(180deg);
	justify-content: space-between;
}

.card-text {
	font-size: 24px;
	word-break: break-word;
	line-height: 1.5;
}

.card-hint-text {
	font-size: 16px;
	color: var(--text-light);
	font-style: italic;
	margin-top: 20px;
	padding: 10px;
	background-color: var(--bg);
	border-radius: 8px;
	width: 100%;
}

.card-hint {
	margin-top: 20px;
	color: var(--text-light);
	font-size: 14px;
	display: flex;
	align-items: center;
	gap: 5px;
}

.training-controls {
	display: flex;
	gap: 25px;
	margin-top: 20px;
	position: relative;
	z-index: 5;
}

.control-btn {
	padding: 18px 30px;
	font-size: 18px;
	border-radius: 50px;
	min-width: 180px;
	justify-content: center;
}

.results {
	display: none;
	text-align: center;
	margin-top: 30px;
	background-color: var(--bg-card);
	padding: 30px;
	border-radius: var(--border-radius);
	box-shadow: 0 10px 30px var(--shadow);
	animation: fadeIn 0.5s ease;
	position: relative;
	z-index: 5;
}

.results h2 {
	margin-bottom: 20px;
	font-size: 28px;
}

.results p {
	margin-bottom: 25px;
	font-size: 18px;
}

.results-buttons {
	display: flex;
	gap: 15px;
	justify-content: center;
	flex-wrap: wrap;
}

.swipe-instruction {
	position: absolute;
	bottom: 20px;
	width: 100%;
	text-align: center;
	color: var(--text-light);
	display: flex;
	justify-content: center;
	gap: 40px;
}

.swipe-hint {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 5px;
}

.drag-feedback {
	border-radius: 20px;
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 24px;
	gap: 10px;
	font-weight: bold;
	opacity: 0;
	transition: opacity 0.3s ease;
	pointer-events: none;
	z-index: 10;
}

.drag-feedback.known {
	background-color: rgba(6, 214, 160, 0.2);
	color: var(--success);
}

.drag-feedback.unknown {
	background-color: rgba(255, 107, 107, 0.2);
	color: var(--secondary);
}

.drag-feedback.visible {
	opacity: 1;
}

@media (max-width: 768px) {
	.drawer {
		max-width: 100%;
		padding: 20px;
        right: -100%;
	}

	.sets-list {
		grid-template-columns: 1fr;
	}

	.flashcard-container {
		height: 300px;
	}

	.training-area {
		width: 100%;
	}

	.flashcard:not(:first-child) {
		margin-top: -84.5%;
		z-index: 1;
	}

	.training-controls {
		flex-direction: column;
		gap: 15px;
	}

	.control-btn {
		min-width: 220px;
	}

	.form-row {
		flex-direction: column;
		gap: 10px;
	}

	.results-buttons {
		flex-direction: column;
	}

	.results-buttons button {
		width: 100%;
	}

	.modal {
		width: 95%;
		padding: 20px;
	}

}

@media (max-width: 609px) {
	.action-header-buttons {
		flex-direction: column;
	}

    .action-header-buttons button {
        align-items: center;
        justify-content: center;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header > div > h1 {
        font-size: 1.5rem !important;
    }

    #landing-page {
        padding: 12px;
    }

    .header > div > .logo {
        width: 40px;
        height: 40px;
        margin-right: 10px;
    }

    .notification {
        right: 10px;
        left: 10px;
        transform: translateY(-100%);
    }
    
    .notification.show {
        transform: translate(0, 0);
    }
}

@keyframes pulse {
	0% {
		transform: scale(1);
	}

	50% {
		transform: scale(1.05);
	}

	100% {
		transform: scale(1);
	}
}

.pulse {
	animation: pulse 2s infinite;
}

@keyframes swipeRight {
	0% {
		transform: translateX(0) rotate(0);
	}

	100% {
		transform: translateX(100px) rotate(5deg);
		opacity: 0;
	}
}

@keyframes swipeLeft {
	0% {
		transform: translateX(0) rotate(0);
	}

	100% {
		transform: translateX(-100px) rotate(-5deg);
		opacity: 0;
	}
}

.swipe-right {
	animation: swipeRight 0.5s forwards;
}

.swipe-left {
	animation: swipeLeft 0.5s forwards;
}

::-webkit-scrollbar {
	width: 8px;
}

::-webkit-scrollbar-track {
	background: var(--bg);
}

::-webkit-scrollbar-thumb {
	background: var(--text-light);
	border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
	background: var(--primary);
}

.back-button {
	position: absolute;
	top: 20px;
	left: 20px;
	background: none;
	border: none;
	color: var(--text);
	font-size: 1.5rem;
	cursor: pointer;
	z-index: 10;
	width: 50px;
	height: 50px;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 50%;
	transition: var(--transition);
}

.back-button:hover {
	background-color: var(--bg-card);
	transform: translateX(-5px);
}

.file-input {
	display: none;
}