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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8fafc;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.logo h1 {
    color: #667eea;
    font-size: 1.8rem;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-link {
    color: #666;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Main Content */
.main {
    padding: 2rem 0;
}

/* Quiz Header */
.quiz-header {
    text-align: center;
    margin-bottom: 3rem;
}

.quiz-header h2 {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.quiz-header p {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.quiz-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stat-label {
    color: #666;
    font-size: 0.9rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

/* Quiz Content */
.quiz-content {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

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

.question-section h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.question-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.difficulty {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.points {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

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

.answer-input {
    margin-bottom: 1rem;
}

.answer-input input {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.answer-input input:focus {
    outline: none;
    border-color: #667eea;
}

.answer-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Progress Bar */
.quiz-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #e1e5e9;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.progress-text {
    font-weight: 600;
    color: #666;
    min-width: 60px;
}

/* Quiz Actions */
.quiz-actions {
    text-align: center;
}

.quiz-voice-hint {
    margin-top: 0.75rem;
    color: #555;
    font-size: 0.95rem;
}

/* Results */
.quiz-results {
    max-width: 600px;
    margin: 0 auto;
}

.results-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.results-card h3 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 2rem;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.result-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: #667eea;
}

.result-label {
    color: #666;
    font-size: 0.9rem;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .quiz-stats {
        gap: 1rem;
    }
    
    .quiz-card {
        padding: 1.5rem;
    }
    
    .answer-actions {
        flex-direction: column;
    }
    
    .results-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .results-actions {
        flex-direction: column;
    }
}