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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 2rem;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Quiz Options */
.quiz-options {
    margin-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.quiz-options label {
    font-weight: bold;
    font-size: 1rem;
}

.quiz-options select {
    padding: 0.5rem;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 8px;
    background: rgba(255,255,255,0.9);
    font-size: 1rem;
    min-width: 150px;
}

.btn-start {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-start:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.4);
}

/* Quiz Container */
.quiz-container {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #45a049);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 10%;
}

/* Question Counter */
.question-counter {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 1.5rem;
}

/* Subject Badge */
.subject-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: linear-gradient(45deg, #FF6B6B, #4ECDC4);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Question Area */
.question-area h2 {
    font-size: 1.4rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: #2c3e50;
}

/* Options */
.options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.option {
    padding: 1rem 1.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    background: #f8f9fa;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.option:hover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.option.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.option.correct {
    border-color: #4CAF50;
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
}

.option.incorrect {
    border-color: #f44336;
    background: linear-gradient(135deg, #f44336, #d32f2f);
    color: white;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.option:hover::before {
    left: 100%;
}

/* Buttons */
.btn-next {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-next:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-next:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Results Container */
.results-container {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    text-align: center;
    animation: slideIn 0.5s ease-out;
}

.results-card h2 {
    color: #2c3e50;
    margin-bottom: 2rem;
    font-size: 2rem;
}

/* Score Display */
.score-display {
    margin-bottom: 2rem;
}

.score-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    font-size: 2rem;
    font-weight: bold;
    margin: 0 auto;
    position: relative;
    animation: bounceIn 0.6s ease-out;
}

.score-circle small {
    font-size: 1rem;
    opacity: 0.8;
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* Performance Analysis */
.performance-analysis {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    text-align: left;
}

.performance-analysis h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    text-align: center;
}

.subject-performance {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid #e0e0e0;
}

.subject-performance:last-child {
    border-bottom: none;
}

.subject-name {
    font-weight: bold;
    color: #555;
}

.subject-score {
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: bold;
}

.subject-score.good {
    background: #4CAF50;
    color: white;
}

.subject-score.average {
    background: #FF9800;
    color: white;
}

.subject-score.poor {
    background: #f44336;
    color: white;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-restart, .btn-study {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-restart {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-study {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
}

.btn-restart:hover, .btn-study:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* Floating Score */
.floating-score {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: bold;
    color: #2c3e50;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 1000;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .quiz-container, .results-container {
        padding: 1.5rem;
        margin: 10px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .floating-score {
        position: static;
        text-align: center;
        margin-bottom: 1rem;
        background: rgba(255,255,255,0.95);
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .quiz-container, .results-container {
        padding: 1rem;
    }
    
    .option {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
}