:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --error-color: #ea4335;
    --text-color: #333;
    --bg-color: #f5f5f5;
    --card-bg: #fff;
    --border-color: #ddd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --hover-color: #f1f1f1;
}
.next-btn-container {
    text-align: center;
    margin-top: 20px;
}

/* Add these new styles */
.answer-container {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    background-color: rgba(52, 168, 83, 0.1);
    animation: fadeIn 0.5s;
}

.answer-label {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.answer-text {
    padding: 10px;
    border-radius: 5px;
    background-color: var(--secondary-color);
    color: white;
    display: inline-block;
}

#nextBtn {
    margin: 20px auto;
    display: block;
    padding: 12px 24px;
    font-size: 1rem;
}

.end-message {
    text-align: center;
    margin-top: 20px;
    font-weight: bold;
    color: var(--primary-color);
    animation: fadeIn 1s;
}

/* Adjust existing styles */
.options-container {
    margin-top: 20px;
}

.question-card {
    margin-bottom: 0; /* Remove extra margin since we're showing one at a time */
}

#nextBtn {
    margin: 20px auto;
    display: block;
}

.end-message {
    text-align: center;
    margin-top: 20px;
    font-weight: bold;
    color: var(--primary-color);
    animation: fadeIn 1s;
}

.dark-mode {
    --primary-color: #8ab4f8;
    --secondary-color: #81c995;
    --error-color: #f28b82;
    --text-color: #e8eaed;
    --bg-color: #202124;
    --card-bg: #303134;
    --border-color: #5f6368;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --hover-color: #3c4043;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

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

.quiz-container {
    background-color: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.question-card {
    margin-bottom: 25px;
    padding: 20px;
    border-radius: 8px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.5s ease-out;
}

.question-text {
    font-size: 1.2rem;
    margin-bottom: 15px;
    font-weight: bold;
}

.options-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}

.option-btn {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    text-align: left;
    transition: all 0.3s;
}

.option-btn:hover {
    background-color: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px var(--shadow-color);
}

.option-btn.correct {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

.option-btn.incorrect {
    background-color: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

.option-btn.disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.feedback {
    margin-top: 10px;
    padding: 10px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: fadeIn 0.3s;
}

.feedback.correct {
    background-color: rgba(52, 168, 83, 0.1);
    color: var(--secondary-color);
}

.feedback.incorrect {
    background-color: rgba(234, 67, 53, 0.1);
    color: var(--error-color);
}

.progress-tracker {
    background-color: var(--primary-color);
    color: white;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    text-align: center;
    font-weight: bold;
}

.completion-message {
    text-align: center;
    padding: 30px;
    position: relative;
}

.completion-message h2 {
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.confetti {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
    pointer-events: none;
}

.hidden {
    display: none;
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-20px); }
    60% { transform: translateY(-10px); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.bounce {
    animation: bounce 0.8s;
}

.shake {
    animation: shake 0.5s;
}

/* Responsive */
@media (max-width: 600px) {
    .options-container {
        grid-template-columns: 1fr;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
}