:root {
    --primary: #4361ee;
    --primary-light: #4895ef;
    --primary-dark: #3a0ca3;
    --secondary: #7209b7;
    --success: #4cc9f0;
    --success-dark: #3a86ff;
    --warning: #f72585;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --gray-light: #e9ecef;
    --gray-dark: #495057;
    --border-radius: 20px;
    --border-radius-sm: 12px;
    --border-radius-xs: 8px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
    --box-shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
    
    /* Gradienty */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient-success: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
    --gradient-warning: linear-gradient(135deg, var(--warning) 0%, #ff6b6b 100%);
    --gradient-dark: linear-gradient(135deg, var(--dark) 0%, #343a40 100%);
    
    /* Deadline colors */
    --deadline-green: #d4edda;
    --deadline-green-text: #155724;
    --deadline-orange: #ffe5c8;
    --deadline-orange-text: #8a5000;
    --deadline-red: #f8d7da;
    --deadline-red-text: #721c24;
    --deadline-black: #2b2b2b;
    --deadline-black-text: #ffffff;
    
    /* Level colors */
    --level-new: #e9ecef;
    --level-new-text: #212529;
    --level-learning: #fff3cd;
    --level-learning-text: #856404;
    --level-almost: #cce5ff;
    --level-almost-text: #004085;
    --level-mastered: #d4edda;
    --level-mastered-text: #155724;
}

.dark-mode {
    --light: #1a1d23;
    --dark: #f8f9fa;
    --gray: #adb5bd;
    --gray-light: #2d3748;
    --gray-dark: #e9ecef;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --box-shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.4);
    --box-shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.2);
    
    /* Dark mode deadline colors */
    --deadline-green: #1e3b2a;
    --deadline-green-text: #7ae19e;
    --deadline-orange: #4a371a;
    --deadline-orange-text: #ffb861;
    --deadline-red: #4a2326;
    --deadline-red-text: #ff7a86;
    --deadline-black: #1a1a1a;
    --deadline-black-text: #ff6b6b;
    
    /* Dark mode level colors */
    --level-new: #2d3748;
    --level-new-text: #e9ecef;
    --level-learning: #5c4b1a;
    --level-learning-text: #ffd54f;
    --level-almost: #1e3a5c;
    --level-almost-text: #7ab3ff;
    --level-mastered: #1e3b2a;
    --level-mastered-text: #7ae19e;
}

/* Reset i podstawowe style */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--light);
    color: var(--dark);
    transition: var(--transition);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* ===== PAGE LOADER ===== */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader-container {
    text-align: center;
    max-width: 400px;
    width: 90%;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.loader-spinner {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
}

.spinner-circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-radius: 50%;
    animation: loader-spin 2s linear infinite;
}

.spinner-circle:nth-child(1) {
    border-top-color: rgba(255, 255, 255, 0.8);
    animation-delay: -0.5s;
}

.spinner-circle:nth-child(2) {
    border-right-color: rgba(255, 255, 255, 0.6);
    animation-delay: -1s;
}

.spinner-circle:nth-child(3) {
    border-bottom-color: rgba(255, 255, 255, 0.4);
    animation-delay: -1.5s;
}

.spinner-circle:nth-child(4) {
    border-left-color: rgba(255, 255, 255, 0.2);
    animation-delay: -2s;
}

@keyframes loader-spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.loader-text h2 {
    color: white;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.loader-text p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.loader-progress {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    margin: 1.5rem 0;
    overflow: hidden;
}

.loader-progress-bar {
    height: 100%;
    background: white;
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.loader-stats {
    display: flex;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* ===== APP CONTAINER ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.app-container.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* ===== HEADER ===== */
header {
    background: var(--gradient-primary);
    color: white;
    padding: 1rem 0;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(67, 97, 238, 0.95);
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-area {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: -0.5px;
}

.logo i {
    font-size: 2rem;
}

.app-subtitle {
    font-size: 0.85rem;
    opacity: 0.9;
    font-weight: 400;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.progress-indicator {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-xs);
    font-weight: 600;
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
}

/* ===== BUTTONS ===== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-xs);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-size: 1rem;
    min-height: 44px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%);
    transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
    animation: ripple 1s ease-out;
}

@keyframes ripple {
    0% {
        transform: scale(0, 0);
        opacity: 0.5;
    }
    100% {
        transform: scale(20, 20);
        opacity: 0;
    }
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--box-shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(67, 97, 238, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid rgba(255, 255, 255, 0.8);
    color: white;
    backdrop-filter: blur(5px);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    min-height: 36px;
}

.btn-text {
    font-weight: 500;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    padding: 0 1.5rem;
    margin-bottom: 2rem;
}

/* ===== SECTIONS ===== */
.section {
    display: none;
    animation: fadeIn 0.5s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px);
    }
    to { 
        opacity: 1; 
        transform: translateY(0);
    }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1rem 0;
    border-bottom: 2px solid var(--gray-light);
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ===== MAIN MENU ===== */
.main-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.menu-card {
    background-color: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.menu-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--box-shadow-lg);
}

.menu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.menu-card:hover::before {
    transform: scaleX(1);
}

.menu-card-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.menu-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.menu-card p {
    color: var(--gray);
    font-size: 1rem;
    line-height: 1.6;
    flex-grow: 1;
}

.menu-card-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--gradient-primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.quick-stats {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--gradient-warning);
    color: white;
    border-radius: var(--border-radius-xs);
    text-align: center;
    font-size: 1rem;
    font-weight: 700;
}

/* ===== DECKS SECTION ===== */
.sort-options {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    padding: 1rem;
    background: var(--gray-light);
    border-radius: var(--border-radius-sm);
}

.deck-filters {
    margin-bottom: 2rem;
}

.filter-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    background: var(--light);
    color: var(--dark);
    transition: var(--transition);
}

.filter-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.filter-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.filter-tag {
    background: var(--gray-light);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-tag .remove-tag {
    cursor: pointer;
    opacity: 0.7;
}

.filter-tag .remove-tag:hover {
    opacity: 1;
}

.decks-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.summary-card {
    background: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius-sm);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.summary-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-sm);
}

.summary-card i {
    font-size: 2rem;
    color: var(--primary);
}

.summary-value {
    font-size: 1.75rem;
    font-weight: 800;
    display: block;
    color: var(--dark);
}

.summary-label {
    font-size: 0.9rem;
    color: var(--gray);
}

.decks-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.loading-decks {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--gray);
}

.loading-decks i {
    font-size: 2rem;
    margin-bottom: 1rem;
}

/* ===== FLASHCARD ===== */
.flashcard-container {
    max-width: 800px;
    margin: 0 auto;
}

.flashcard {
    perspective: 1500px;
    margin: 2rem auto;
    height: 400px;
    position: relative;
    cursor: pointer;
    transition: border 0.3s ease, box-shadow 0.3s ease;
    border-radius: var(--border-radius);
}

/* Klasy poziomów dla fiszki */
.flashcard-level-new {
    border: 4px solid var(--level-new);
    box-shadow: 0 0 0 2px var(--level-new-text);
}
.flashcard-level-learning {
    border: 4px solid var(--level-learning);
}
.flashcard-level-almost {
    border: 4px solid var(--level-almost);
}
.flashcard-level-mastered {
    border: 4px solid var(--level-mastered);
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
}

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

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: calc(var(--border-radius) - 4px);
    display: flex;
    flex-direction: column;
    background: var(--light);
    box-shadow: var(--box-shadow-lg);
    overflow: hidden;
}

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

.flashcard-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flashcard-number {
    font-weight: 600;
    color: var(--primary);
}

.flashcard-total {
    color: var(--gray);
}

.flashcard-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    text-align: center;
}

.flashcard-word {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    word-break: break-word;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--dark);
}

.flashcard-hint {
    color: var(--gray);
    font-size: 1rem;
    opacity: 0.8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.flashcard-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-light);
    display: flex;
    justify-content: center;
}

.flashcard-level {
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.flashcard-translations {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--gray-light);
    border-radius: var(--border-radius-sm);
    font-size: 1.1rem;
    color: var(--gray-dark);
}

/* Progress bar */
.progress-container {
    margin: 2rem 0;
}

.progress-bar {
    height: 10px;
    background-color: var(--gray-light);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.progress-text {
    text-align: center;
    font-weight: 600;
    color: var(--gray);
    font-size: 0.9rem;
}

/* Knowledge levels */
.knowledge-levels {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

.knowledge-btn {
    padding: 1rem;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 600;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    font-size: 0.9rem;
}

.knowledge-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-sm);
}

.knowledge-new {
    background-color: var(--level-new);
    color: var(--level-new-text);
}

.knowledge-learning {
    background-color: var(--level-learning);
    color: var(--level-learning-text);
}

.knowledge-almost {
    background-color: var(--level-almost);
    color: var(--level-almost-text);
}

.knowledge-mastered {
    background-color: var(--level-mastered);
    color: var(--level-mastered-text);
}

.knowledge-btn i {
    font-size: 1.5rem;
}

/* Flashcard controls */
.flashcard-controls {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2rem;
}

/* ===== TEST SECTION ===== */
.test-counter {
    background: var(--gradient-primary);
    color: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    text-align: center;
}

.counter-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.counter-value {
    font-size: 2rem;
    font-weight: 800;
}

.counter-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.test-settings {
    background: var(--gray-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
}

.settings-group {
    margin-bottom: 1.5rem;
}

.settings-group:last-child {
    margin-bottom: 0;
}

.settings-group h4 {
    margin-bottom: 1rem;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.test-mode-selector {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.test-mode-btn {
    flex: 1;
    min-width: 150px;
}

.test-mode-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: var(--primary);
}

.test-config {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.config-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.config-select {
    padding: 0.75rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-xs);
    background: var(--light);
    color: var(--dark);
    font-size: 1rem;
}

.test-deck-selector {
    background: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.selector-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.selected-deck {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: var(--gray-light);
    border-radius: var(--border-radius-sm);
}

.selected-deck-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.selected-deck-info i {
    font-size: 2rem;
    color: var(--primary);
}

.test-topic-selection {
    background: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.selection-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.test-topics-container {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 1.5rem;
}

.selection-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Test containers */
.test-content {
    max-width: 800px;
    margin: 0 auto;
}

.test-container {
    background: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
}

.test-question-container {
    text-align: center;
    margin-bottom: 2rem;
}

.test-question {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark);
}

.test-level-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.test-answer-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.test-answer {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-xs);
    font-size: 1.1rem;
    background: var(--light);
    color: var(--dark);
}

.test-answer:focus {
    outline: none;
    border-color: var(--primary);
}

.test-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.test-option {
    padding: 1.5rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-sm);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    user-select: none;
}

.test-option:hover {
    border-color: var(--primary);
    background: rgba(67, 97, 238, 0.05);
}

.test-option.selected {
    background: var(--gradient-primary);
    color: white;
    border-color: var(--primary);
    box-shadow: var(--box-shadow-sm);
}

.test-tf-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.test-tf-option {
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    font-weight: 700;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.test-tf-option.true {
    border: 2px solid var(--level-mastered);
    color: var(--level-mastered-text);
}

.test-tf-option.false {
    border: 2px solid var(--level-new);
    color: var(--level-new-text);
}

.test-tf-option:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-sm);
}

.test-tf-option.selected.true {
    background: var(--level-mastered);
    color: var(--level-mastered-text);
}

.test-tf-option.selected.false {
    background: var(--level-new);
    color: var(--level-new-text);
}

.test-feedback {
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    text-align: center;
    margin-top: 1.5rem;
    animation: fadeIn 0.3s ease;
}

.test-feedback.correct {
    background: var(--level-mastered);
    color: var(--level-mastered-text);
}

.test-feedback.incorrect {
    background: var(--level-new);
    color: var(--level-new-text);
}

/* Test result */
.test-result {
    background: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
}

.result-header {
    text-align: center;
    margin-bottom: 2rem;
}

.result-score {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    margin: 1rem 0;
}

.score-value {
    font-size: 4rem;
}

.result-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.result-stat {
    background: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.result-stat i {
    font-size: 2rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
}

.incorrect-answers-container {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 1rem;
}

.incorrect-answer-item {
    background: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
}

.incorrect-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.result-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

/* ===== STATISTICS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--light);
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-lg);
}

.stat-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--gray);
    font-size: 1rem;
}

.stat-trend {
    margin-top: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.stat-trend.positive {
    color: var(--level-mastered-text);
}

.stat-trend.negative {
    color: var(--level-new-text);
}

.detailed-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.menu-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.stats-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.today-badge {
    background: var(--gradient-warning);
    color: white;
}

.streak-badge {
    background: var(--gradient-success);
    color: white;
}

.achievements-badge {
    background: var(--gradient-primary);
    color: white;
}

.stats-content {
    margin-top: 1rem;
}

.activity-breakdown {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.activity-item {
    text-align: center;
    padding: 1rem;
    background: var(--gray-light);
    border-radius: var(--border-radius-sm);
}

.activity-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.study-icon {
    color: var(--primary);
}

.test-icon {
    color: var(--secondary);
}

.review-icon {
    color: var(--success);
}

.activity-count {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
}

.activity-label {
    font-size: 0.9rem;
    color: var(--gray);
}

.streak-calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
    margin-top: 1rem;
}

.streak-day {
    aspect-ratio: 1;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
}

.streak-day.active {
    background: var(--success);
    color: white;
}

.streak-day.inactive {
    background: var(--gray-light);
    color: var(--gray);
}

.achievements-list {
    max-height: 300px;
    overflow-y: auto;
}

.achievement {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: var(--gray-light);
    border-radius: var(--border-radius-sm);
}

.achievement.unlocked {
    background: var(--level-mastered);
    color: var(--level-mastered-text);
}

.achievement.locked {
    opacity: 0.6;
}

.achievement i {
    font-size: 1.5rem;
}

.loading-achievement {
    justify-content: center;
}

.stats-charts {
    margin-top: 2rem;
}

.chart-container {
    height: 300px;
    margin-top: 1rem;
}

/* ===== IMPORT SECTION ===== */
.import-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.import-instructions {
    line-height: 1.8;
}

.code-block {
    background: var(--dark);
    color: var(--light);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    margin: 1rem 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
}

.instructions-tips {
    margin-top: 1.5rem;
}

.tip {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.tip i {
    color: var(--success);
}

.file-upload-container {
    margin-top: 1rem;
}

.file-upload {
    border: 3px dashed var(--gray-light);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--light);
}

.file-upload:hover {
    border-color: var(--primary);
    background: rgba(67, 97, 238, 0.05);
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.upload-text p {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.file-preview {
    margin-top: 1.5rem;
    border: 1px solid var(--gray-light);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.preview-header {
    background: var(--gray-light);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.preview-content {
    padding: 1.5rem;
}

.preview-stats {
    margin-bottom: 1rem;
    font-weight: 600;
}

.preview-text {
    max-height: 200px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    background: var(--gray-light);
    padding: 1rem;
    border-radius: var(--border-radius-xs);
}

.create-deck-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-input {
    padding: 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-xs);
    font-size: 1rem;
    background: var(--light);
    color: var(--dark);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
}

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

/* ===== FOOTER ===== */
.app-footer {
    margin-top: auto;
    padding: 2rem 0;
    border-top: 1px solid var(--gray-light);
    color: var(--gray);
    background: var(--light);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.footer-subtitle {
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn-link {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    transition: var(--transition);
}

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

/* ===== MODALS ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: var(--light);
    color: var(--dark);
    margin: 5% auto;
    padding: 0;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--box-shadow-lg);
    animation: slideIn 0.3s;
    overflow: hidden;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
}

.modal-body {
    padding: 1.5rem;
}

.modal-input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-xs);
    font-size: 1rem;
    margin-top: 0.5rem;
    background: var(--light);
    color: var(--dark);
}

.modal-options {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-light);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.about-content, .help-content {
    line-height: 1.8;
}

.about-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.about-logo i {
    font-size: 4rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.about-features {
    margin: 1.5rem 0;
}

.about-features ul {
    list-style: none;
    padding-left: 0;
}

.about-features li {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.about-features i.fa-check {
    color: var(--success);
}

.about-stats {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--gray-light);
    border-radius: var(--border-radius-sm);
}

.help-section {
    margin-bottom: 2rem;
}

.help-section h4 {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.help-section p {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
}

kbd {
    background: var(--gray-light);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.1);
}

@keyframes slideIn {
    from { 
        transform: translateY(-50px); 
        opacity: 0; 
    }
    to { 
        transform: translateY(0); 
        opacity: 1; 
    }
}

/* ===== NOTIFICATIONS ===== */
#notificationsContainer {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.notification {
    padding: 1.25rem 1.5rem;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--box-shadow-lg);
    animation: slideInRight 0.3s ease, fadeOut 0.3s ease 4.7s;
    max-width: 350px;
    word-break: break-word;
    backdrop-filter: blur(10px);
    border-left: 5px solid;
}

.notification-success {
    background: #10b981;
    color: white;
    border-left-color: #047857;
}

.notification-error {
    background: #ef4444;
    color: white;
    border-left-color: #b91c1c;
}

.notification-info {
    background: #3b82f6;
    color: white;
    border-left-color: #1d4ed8;
}

.dark-mode .notification-info {
    background: #3b82f6;
    color: white;
    border-left-color: #1d4ed8;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; transform: translateX(100%); }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1200px) {
    .main-menu {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .decks-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    header {
        padding: 0.25rem 0;
    }
    
    .header-content {
        flex-direction: row;
        flex-wrap: nowrap;
        text-align: left;
        gap: 0.5rem;
        justify-content: space-between;
        padding: 0 1rem;
    }
    
    .logo-area {
        flex: 1;
    }

    .app-subtitle {
        display: none;
    }

    .logo {
        font-size: 1.2rem;
    }
    
    .logo i {
        font-size: 1.4rem;
    }
    
    .header-actions {
        justify-content: flex-end;
        gap: 0.5rem;
    }

    .header-actions .btn-text {
        display: none !important;
    }

    .header-actions .btn {
        padding: 0 !important;
        width: 40px;
        height: 40px;
        min-height: 40px !important;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
    }

    .header-actions .btn:active::after {
        content: attr(title);
        position: absolute;
        top: 100%;
        right: 0;
        background: rgba(0,0,0,0.8);
        color: white;
        padding: 4px 8px;
        border-radius: 4px;
        font-size: 11px;
        white-space: nowrap;
        z-index: 1001;
        margin-top: 5px;
        pointer-events: none;
    }

    .progress-indicator {
        padding: 0.25rem 0.5rem;
        font-size: 0.8rem;
    }
    
    .main-menu {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .section-actions {
        justify-content: center;
    }
    
    .decks-container {
        grid-template-columns: 1fr;
    }
    
    .decks-summary {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .flashcard {
        height: 350px;
    }
    
    .flashcard-word {
        font-size: 2rem;
    }
    
    .knowledge-levels {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .test-counter {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .test-options {
        grid-template-columns: 1fr;
    }
    
    .test-tf-options {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .detailed-stats {
        grid-template-columns: 1fr;
    }
    
    .activity-breakdown {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .result-details {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 0 1rem;
    }
    
    .header-content, .footer-content {
        padding: 0 1rem;
    }
    
    .flashcard {
        height: 300px;
    }
    
    .flashcard-word {
        font-size: 1.75rem;
    }
    
    .decks-summary {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .activity-breakdown {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .result-details {
        grid-template-columns: 1fr;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .menu-card {
        padding: 1.5rem;
    }
}

/* Print styles */
@media print {
    .page-loader,
    .header-actions,
    .footer,
    .btn,
    .test-mode-selector,
    .test-deck-selector {
        display: none !important;
    }
    
    .app-container {
        opacity: 1 !important;
    }
    
    .main-content {
        padding: 0;
    }
    
    .menu-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid #000 !important;
    }
}

/* Animation for knowledge buttons */
.knowledge-btn.animate-click {
    animation: btn-pop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes btn-pop {
    0% { transform: scale(1); }
    50% { transform: scale(0.9); }
    100% { transform: scale(1); }
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
body.dark-mode ::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: content-box;
}
body.dark-mode ::-webkit-scrollbar-thumb {
    background: #475569;
}
::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
    border-width: 0;
}

/* Naprawa przycisków w jasnym motywie */
body:not(.dark-mode) .btn-outline {
    color: #333;
    border-color: #e2e8f0;
    background-color: white;
}
body:not(.dark-mode) .btn-outline:hover {
    background-color: #f8fafc;
    border-color: #4361ee;
    color: #4361ee;
}

/* Stylizacja statystyk nauki (Study Stats) */
.study-stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 10px;
    margin: 15px 0;
}
.study-stat {
    background: rgba(67, 97, 238, 0.05);
    border: 1px solid rgba(67, 97, 238, 0.1);
    border-radius: 12px;
    padding: 10px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
body.dark-mode .study-stat {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}
.study-stat-icon { font-size: 1.2rem; margin-bottom: 5px; color: #4361ee; }
.study-stat-value { font-size: 1.1rem; font-weight: 700; color: #333; }
body.dark-mode .study-stat-value { color: #fff; }
.study-stat-label { font-size: 0.75rem; color: #64748b; text-transform: uppercase; letter-spacing: 0.5px; }
body.dark-mode .study-stat-label { color: #94a3b8; }

/* Ulepszony wygląd tematów (Topics) */
.topic-item {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 10px;
    transition: all 0.2s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
body.dark-mode .topic-item {
    background: #1e293b;
    border-color: #334155;
}
.topic-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-color: #4361ee;
}
.topic-header { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.topic-name { font-weight: 600; font-size: 1.05rem; }
.topic-meta { display: flex; align-items: center; gap: 15px; width: 100%; }

/* Poprawa Modali */
.modal {
    backdrop-filter: blur(5px);
    padding: 10px;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal-content { 
    border-radius: 20px; 
    overflow: hidden; 
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); 
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(255,255,255,0.1);
}

.modal-header {
    background: linear-gradient(135deg, #4361ee 0%, #4895ef 100%);
    color: white;
    padding: 1.25rem 1.5rem;
    border-bottom: none;
}
.modal-header h3 { margin: 0; font-size: 1.25rem; display: flex; align-items: center; gap: 10px; }
.modal-close { color: rgba(255,255,255,0.8); transition: 0.2s; }
.modal-close:hover { color: white; transform: rotate(90deg); }

.modal-body {
    overflow-y: auto;
    padding: 1.5rem;
    line-height: 1.7;
}

.help-section, .about-features { 
    background: rgba(67, 97, 238, 0.04); 
    padding: 15px; 
    border-radius: 12px; 
    margin-bottom: 15px; 
    border: 1px solid rgba(67, 97, 238, 0.1);
}
body.dark-mode .help-section, body.dark-mode .about-features { 
    background: rgba(255,255,255,0.03); 
    border-color: rgba(255,255,255,0.05);
}

.about-features ul li { margin-bottom: 10px; display: flex; align-items: center; gap: 10px; }
.about-features ul li i { color: #10b981; background: rgba(16, 185, 129, 0.1); padding: 5px; border-radius: 50%; width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; }

.modal-footer { background: var(--light); border-top: 1px solid var(--gray-light); padding: 1rem 1.5rem; }

/* Nowy wygląd kart działów (Deck Cards) */
.deck-item {
    background: #fff;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    margin-bottom: 20px;
}
body.dark-mode .deck-item {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}
.deck-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border-color: #4361ee;
}

.deck-main-content {
    padding: 20px;
    flex-grow: 1;
}

.deck-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    cursor: pointer;
    margin-bottom: 15px;
}

.deck-title-group {
    display: flex;
    gap: 15px;
    align-items: center;
}

.deck-icon-box {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.1) 0%, rgba(72, 149, 239, 0.1) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #4361ee;
    flex-shrink: 0;
}

.deck-title-group h3 {
    margin: 0 0 5px 0;
    font-size: 1.2rem;
    font-weight: 700;
    color: #1e293b;
}
body.dark-mode .deck-title-group h3 { color: #f8fafc; }

.deck-desc-short {
    margin: 0;
    font-size: 0.9rem;
    color: #64748b;
    line-height: 1.4;
}
body.dark-mode .deck-desc-short { color: #94a3b8; }

.deck-arrow {
    color: #94a3b8;
    transition: transform 0.3s ease;
    padding: 5px;
}
.deck-arrow.rotated {
    transform: rotate(180deg);
}

.deck-stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.d-stat {
    font-size: 0.8rem;
    padding: 4px 10px;
    background: #f1f5f9;
    border-radius: 6px;
    color: #64748b;
    display: flex;
    align-items: center;
    gap: 6px;
}
body.dark-mode .d-stat {
    background: #0f172a;
    color: #94a3b8;
}
.d-stat i { color: #4361ee; }
.d-stat.highlight {
    background: rgba(67, 97, 238, 0.1);
    color: #4361ee;
    font-weight: 600;
}

.deck-topics-container {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #f1f5f9;
    animation: slideDown 0.3s ease-out;
}
body.dark-mode .deck-topics-container { border-color: #334155; }

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.deck-actions-footer {
    padding: 15px 20px;
    background: #f8fafc;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}
body.dark-mode .deck-actions-footer {
    background: #0f172a;
    border-color: #334155;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    min-height: 32px;
}

/* TEST DECK SELECTOR ENHANCEMENTS */
.test-deck-selector {
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}
.test-deck-selector:focus-within, .test-deck-selector:hover {
    border-color: var(--primary);
    box-shadow: var(--box-shadow-lg);
}

.selected-deck {
    box-shadow: var(--box-shadow-sm);
    border: 2px solid var(--gray-light);
    transition: var(--transition);
}
.selected-deck.selected, .selected-deck:focus-within, .selected-deck:hover {
    border-color: var(--primary);
    box-shadow: var(--box-shadow-lg);
    background: var(--gradient-primary);
    color: #fff;
}
.selected-deck.selected .selected-deck-info i,
.selected-deck:focus-within .selected-deck-info i,
.selected-deck:hover .selected-deck-info i {
    color: #fff;
}

.test-topic-selection {
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}
.test-topic-selection:focus-within, .test-topic-selection:hover {
    border-color: var(--primary);
    box-shadow: var(--box-shadow-lg);
}

.test-topics-container .topic-item {
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-xs);
    margin-bottom: 10px;
    background: var(--light);
    transition: var(--transition);
    cursor: pointer;
    box-shadow: var(--box-shadow-sm);
}
.test-topics-container .topic-item.selected,
.test-topics-container .topic-item:focus,
.test-topics-container .topic-item:hover {
    border-color: var(--primary);
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: var(--box-shadow-lg);
}

/* Dark mode poprawki */
.dark-mode .test-deck-selector,
.dark-mode .test-topic-selection {
    background: var(--gray-light);
    border-color: #3a3f47;
    box-shadow: var(--box-shadow);
}
.dark-mode .selected-deck {
    background: var(--gray-light);
    color: var(--dark);
    border-color: #3a3f47;
}
.dark-mode .selected-deck.selected,
.dark-mode .selected-deck:focus-within,
.dark-mode .selected-deck:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: var(--primary);
}
.dark-mode .test-topics-container .topic-item {
    background: var(--gray-light);
    color: var(--dark);
    border-color: #3a3f47;
}
.dark-mode .test-topics-container .topic-item.selected,
.dark-mode .test-topics-container .topic-item:focus,
.dark-mode .test-topics-container .topic-item:hover {
    background: var(--gradient-primary);
    color: #fff;
    border-color: var(--primary);
}

/* ===== NOWE ULEPSZENIA ===== */

/* Przycisk "Wybierz wszystkie" w testach */
.select-all-btn {
    background: var(--gray-light);
    border: 1px solid var(--gray);
    color: var(--dark);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}
.select-all-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Lepsze oznaczenie checkboxów w testach */
.topic-checkbox {
    accent-color: var(--primary);
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Komunikat o braku fiszek */
.empty-test-message {
    text-align: center;
    padding: 3rem;
    background: var(--gray-light);
    border-radius: var(--border-radius);
    color: var(--gray-dark);
    font-size: 1.2rem;
}
.empty-test-message i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
    display: block;
}

/* Przycisk "Rozpocznij test" po wybraniu tematu */
.start-test-btn {
    margin-top: 1.5rem;
    width: 100%;
    padding: 1rem;
    font-size: 1.2rem;
}

/* Wizualne oznaczenie poziomu na fiszce - już dodane w .flashcard-level-* */
/* Dodatkowe podświetlenie przycisków poziomu */
.knowledge-btn.active-level {
    transform: scale(1.05);
    box-shadow: 0 0 0 3px currentColor;
}

/* Poprawa wyglądu wybranego tematu w testach */
.test-topics-container .topic-item.selected {
    background: var(--gradient-primary) !important;
    color: white !important;
}
.test-topics-container .topic-item.selected .progress-bar .progress {
    background: white !important;
}
.test-topics-container .topic-item.selected .progress-text {
    color: white !important;
}