* {
    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;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 28px;
    margin-bottom: 10px;
}

.header p {
    font-size: 16px;
    opacity: 0.9;
}

.quiz-content {
    padding: 30px;
}

.question-card {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 20%, #fff 20%);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.question-card:hover {
    transform: translateY(-5px);
}

.question-number {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    font-size: 14px;
}

.question-text {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    line-height: 1.6;
}

.question-image {
    max-width: 100%;
    height: auto;
    margin: 15px 0;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 15px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

.option:hover {
    border-color: #667eea;
    background: #f8f9ff;
    transform: translateX(5px);
}

.option input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.option input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.option-text {
    flex: 1;
    font-size: 16px;
    color: #555;
}

.option.correct {
    background: #d4edda;
    border-color: #28a745;
}

.option.incorrect {
    background: #f8d7da;
    border-color: #dc3545;
}

.option.disabled {
    pointer-events: none;
    opacity: 0.7;
}

.submit-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 18px;
    font-weight: bold;
    border-radius: 30px;
    cursor: pointer;
    display: block;
    margin: 30px auto;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.6);
}

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

.result-box {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    border-radius: 15px;
    padding: 25px;
    margin: 20px 0;
    text-align: center;
    display: none;
}

.result-box.show {
    display: block;
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-box h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 24px;
}

.score {
    font-size: 48px;
    font-weight: bold;
    color: #667eea;
    margin: 15px 0;
}

.result-message {
    font-size: 18px;
    color: #555;
    margin-top: 10px;
}

.reset-btn {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 25px;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    transform: scale(1.05);
}

.sidebar {
    position: fixed;
    right: -300px;
    top: 0;
    width: 300px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
    transition: right 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar.open {
    right: 0;
}

.sidebar-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.sidebar-header h3 {
    margin: 0 0 10px 0;
    font-size: 18px;
}

.sidebar-filters {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.filter-btn {
    flex: 1;
    padding: 8px;
    border: 1px solid white;
    background: transparent;
    color: white;
    border-radius: 5px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s ease;
}

.filter-btn:hover, .filter-btn.active {
    background: white;
    color: #667eea;
}

.sidebar-content {
    padding: 15px;
}

.question-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid #e0e0e0;
}

.question-item:hover {
    background: #f8f9ff;
    transform: translateX(-5px);
}

.question-item.correct {
    background: #d4edda;
    border-color: #28a745;
}

.question-item.incorrect {
    background: #f8d7da;
    border-color: #dc3545;
}

.question-item.unanswered {
    background: #fff3cd;
    border-color: #ffc107;
}

.question-number-badge {
    min-width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #667eea;
    color: white;
    border-radius: 50%;
    font-weight: bold;
    font-size: 14px;
}

.question-item.correct .question-number-badge {
    background: #28a745;
}

.question-item.incorrect .question-number-badge {
    background: #dc3545;
}

.question-item.unanswered .question-number-badge {
    background: #ffc107;
}

.question-status {
    flex: 1;
    font-size: 14px;
    color: #555;
}

.question-icon {
    font-size: 18px;
}

.toggle-sidebar-btn {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-sidebar-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.6);
}

.close-sidebar-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: transparent;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.close-sidebar-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.stats-summary {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    font-size: 13px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 22px;
    }

    .question-text {
        font-size: 16px;
    }

    .quiz-content {
        padding: 20px;
    }

    .sidebar {
        width: 280px;
        right: -280px;
    }

    .toggle-sidebar-btn {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}