/* Základné nastavenia */
:root {
    --primary-color: #8A2BE2;
    --secondary-color: #4B0082;
    --accent-color: #00BFFF;
    --text-color: #E6E6FA;
    --background-dark: #0F0F23;
    --background-light: #1A1A3A;
    --success-color: #00FF7F;
    --error-color: #FF4500;
    --border-radius: 15px;
    --glow-effect: 0 0 10px rgba(138, 43, 226, 0.7), 0 0 20px rgba(138, 43, 226, 0.5);
}

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

body {
    font-family: 'Orbitron', sans-serif;
    color: var(--text-color);
    background-color: var(--background-dark);
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* Vesmírne pozadie */
.stars, .twinkling, .clouds {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.stars {
    background: #000 url('https://i.imgur.com/YKY28eT.png') repeat top center;
}

.twinkling {
    background: transparent url('https://i.imgur.com/XYMF4ca.png') repeat top center;
    animation: move-twink-back 200s linear infinite;
}

.clouds {
    background: transparent url('https://i.imgur.com/mHbScrQ.png') repeat top center;
    animation: move-clouds-back 200s linear infinite;
}

@keyframes move-twink-back {
    from {background-position: 0 0;}
    to {background-position: -10000px 5000px;}
}

@keyframes move-clouds-back {
    from {background-position: 0 0;}
    to {background-position: 10000px 0;}
}

/* Kontajner */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* Hlavička */
header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px;
    border-radius: var(--border-radius);
    background-color: rgba(26, 26, 58, 0.7);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.36);
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    background: linear-gradient(to right, var(--accent-color), var(--primary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 15px rgba(138, 43, 226, 0.5);
}

header p {
    font-size: 1.2rem;
    color: var(--accent-color);
}

/* Sekcie */
section {
    background-color: rgba(26, 26, 58, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.36);
    transition: all 0.3s ease;
}

section h2 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--accent-color);
}

/* Tlačidlá */
button {
    font-family: 'Orbitron', sans-serif;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    background-color: var(--secondary-color);
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 10px;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

button:active {
    transform: translateY(1px);
}

.glow-btn {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    box-shadow: var(--glow-effect);
}

.glow-btn:hover {
    box-shadow: 0 0 15px rgba(138, 43, 226, 0.9), 0 0 30px rgba(138, 43, 226, 0.7);
}

.back-btn {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

.back-btn:hover {
    background-color: var(--accent-color);
    color: var(--background-dark);
}

.nav-btn {
    background-color: var(--background-light);
    border: 1px solid var(--accent-color);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Uvítacia obrazovka */
#welcome-screen {
    text-align: center;
    padding: 50px;
}

#welcome-screen h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

#welcome-screen p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

/* Výber kvízu */
.quiz-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.quiz-card {
    background: linear-gradient(135deg, var(--background-light), var(--secondary-color));
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.quiz-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 191, 255, 0.5);
}

.quiz-card h3 {
    margin-bottom: 10px;
    color: var(--accent-color);
}

.quiz-card p {
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.quiz-card .quiz-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Nastavenia kvízu */
.settings-container {
    max-width: 500px;
    margin: 0 auto;
}

.setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px;
    background-color: rgba(15, 15, 35, 0.5);
    border-radius: var(--border-radius);
}

.time-settings {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding: 15px;
    background-color: rgba(15, 15, 35, 0.5);
    border-radius: var(--border-radius);
}

.time-settings input {
    width: 80px;
    padding: 8px;
    border-radius: var(--border-radius);
    border: 1px solid var(--accent-color);
    background-color: var(--background-dark);
    color: var(--text-color);
    font-family: 'Orbitron', sans-serif;
}

/* Prepínač */
.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--background-dark);
    transition: .4s;
    border: 1px solid var(--accent-color);
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 3px;
    background-color: var(--accent-color);
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Kvízový kontajner */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--accent-color);
}

#timer {
    font-size: 1.5rem;
    padding: 10px 20px;
    background-color: var(--background-dark);
    border-radius: var(--border-radius);
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

#question-container {
    margin-bottom: 30px;
}

#question-number {
    font-size: 1.2rem;
    color: var(--accent-color);
    margin-bottom: 15px;
}

#question-text {
    font-size: 1.5rem;
    margin-bottom: 30px;
    line-height: 1.5;
}

/* Odpovede */
#answer-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* ABCD odpovede */
.option {
    padding: 15px;
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
    display: flex;
    align-items: center;
}

.option:hover {
    background-color: rgba(75, 0, 130, 0.5);
    border-color: var(--accent-color);
}

.option.selected {
    background-color: var(--primary-color);
    border-color: var(--accent-color);
}

.option-letter {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: var(--background-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-right: 15px;
    font-weight: bold;
}

/* Textové odpovede */
.text-answer {
    width: 100%;
    padding: 15px;
    border-radius: var(--border-radius);
    border: 2px solid var(--accent-color);
    background-color: var(--background-dark);
    color: var(--text-color);
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    resize: vertical;
    min-height: 100px;
}

/* Spájanie */
.matching-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.matching-item {
    padding: 15px;
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    border: 2px solid var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.matching-line {
    position: absolute;
    background-color: var(--accent-color);
    height: 2px;
    transform-origin: left center;
    z-index: 10;
}

/* Zatrieďovanie */
.categorization-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.category {
    padding: 15px;
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    border: 2px solid var(--accent-color);
}

.category-title {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--accent-color);
}

.items-container {
    min-height: 100px;
    padding: 10px;
    background-color: rgba(15, 15, 35, 0.5);
    border-radius: var(--border-radius);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.item {
    padding: 8px 15px;
    background-color: var(--primary-color);
    border-radius: var(--border-radius);
    cursor: grab;
    user-select: none;
}

.item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

/* Navigačné tlačidlá */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

/* Výsledky */
#score-display {
    text-align: center;
    margin-bottom: 30px;
}

.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
    box-shadow: 0 0 20px rgba(138, 43, 226, 0.7);
}

#score-percentage {
    font-size: 2.5rem;
    font-weight: bold;
}

#results-details {
    margin-top: 30px;
}

.result-item {
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--background-light);
    border-radius: var(--border-radius);
}

.result-item h3 {
    margin-bottom: 10px;
    color: var(--accent-color);
}

.correct {
    color: var(--success-color);
}

.incorrect {
    color: var(--error-color);
}

/* Päta */
footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    color: var(--text-color);
    opacity: 0.7;
}

/* Pomocné triedy */
.hidden {
    display: none;
}

.buttons {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

/* Animácie */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.fade-out {
    animation: fadeOut 0.5s ease-out;
}

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

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

/* Responzívny dizajn */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    #question-text {
        font-size: 1.2rem;
    }
    
    .quiz-list {
        grid-template-columns: 1fr;
    }
    
    .matching-container {
        grid-template-columns: 1fr;
    }
    
    .navigation-buttons {
        flex-direction: column;
    }
    
    .nav-btn, .glow-btn, .back-btn {
        width: 100%;
        margin: 5px 0;
    }
}