:root {
    --primary-color: #4a90e2;
    --secondary-color: #6c5ce7;
    --success-color: #00cec9;
    --danger-color: #ff7675;
    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-color: #2d3436;
}

body {
    background: var(--background-gradient);
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    min-height: 100vh;
    padding-bottom: 80px; /* Space for fixed bottom bar */
}

/* Glassmorphism Header */
.quiz-header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 2rem 0;
    margin-bottom: 2rem;
    color: white;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.quiz-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Question Cards */
.question-card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 5px solid var(--primary-color);
}

.question-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.question-card h5 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3436;
    font-size: 1.1rem;
}

.badge-category {
    background: var(--secondary-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    vertical-align: middle;
}

/* Options Styling */
.options-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.option-item {
    padding: 10px 15px;
    border: 2px solid #dfe6e9;
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
}

.option-item:hover {
    background-color: #f1f2f6;
    border-color: var(--primary-color);
}

.option-item.selected {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.1);
    font-weight: 600;
}

/* Checkbox/Radio Custom Styling */
.option-radio {
    margin-right: 15px;
    transform: scale(1.2);
    cursor: pointer;
}

/* Result Styles */
.correct-answer {
    background-color: rgba(0, 206, 201, 0.2) !important;
    border-color: var(--success-color) !important;
    color: #006266;
}

.wrong-answer {
    background-color: rgba(255, 118, 117, 0.2) !important;
    border-color: var(--danger-color) !important;
    color: #d63031;
}

.correct-badge {
    margin-left: auto;
    color: var(--success-color);
    font-weight: bold;
}

.wrong-badge {
    margin-left: auto;
    color: var(--danger-color);
    font-weight: bold;
}

/* Fixed Bottom Bar */
.bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: white;
    padding: 15px 0;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.1);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-calculate {
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
    border: none;
    padding: 12px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    color: white;
    font-weight: bold;
    box-shadow: 0 5px 15px rgba(108, 92, 231, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-calculate:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(108, 92, 231, 0.6);
}

.btn-calculate:active {
    transform: scale(0.95);
}

/* Score Modal Customization */
.modal-content {
    border-radius: 20px;
    border: none;
}
.modal-header {
    background: var(--background-gradient);
    color: white;
    border-radius: 20px 20px 0 0;
}
.score-display {
    font-size: 4rem;
    font-weight: bold;
    text-align: center;
    color: var(--secondary-color);
}
.score-text {
    text-align: center;
    font-size: 1.2rem;
    color: #636e72;
}

/* Responsive adjustments */
@media (max-width: 576px) {
    .question-card {
        padding: 1rem;
    }
    .btn-calculate {
        width: 90%;
        padding: 10px;
    }
}