* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            color: #333;
        }
        
        .container {
            display: flex;
            min-height: 100vh;
        }
        
        /* Header Styles */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 60px;
            background-color: #4a6fa5;
            color: white;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            z-index: 100;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 24px;
            font-weight: bold;
        }
        
        .logo span {
            color: #ffd166;
        }
        
        .user-info {
            display: flex;
            align-items: center;
            cursor: pointer;
        }
        
        .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: #ffd166;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
            font-weight: bold;
        }
        
        /* Sidebar Styles */
        .sidebar {
            width: 240px;
            background-color: #ffffff;
            padding: 80px 0 20px;
            box-shadow: 2px 0 5px rgba(0,0,0,0.05);
            position: fixed;
            height: 100vh;
            z-index: 90;
        }
        
        .nav-item {
            padding: 15px 20px;
            display: flex;
            align-items: center;
            color: #4a6fa5;
            text-decoration: none;
            transition: all 0.3s;
        }
        
        .nav-item:hover, .nav-item.active {
            background-color: #f0f5ff;
            color: #2c4c7c;
        }
        
        .nav-item i {
            margin-right: 10px;
            font-size: 20px;
        }
        
        /* Main Content Area */
        .content {
            flex: 1;
            margin-left: 240px;
            padding: 80px 20px 20px;
        }
        
        .page {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            animation: fadeIn 0.3s ease-in-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        h2 {
            color: #4a6fa5;
            margin-bottom: 20px;
            font-size: 24px;
        }
        
        /* Login Page Styles */
        .login {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 40px 20px;
        }
        
        .login h2 {
            margin-bottom: 30px;
        }
        
        #login-form {
            width: 100%;
            max-width: 320px;
        }
        
        input[type="text"], input[type="password"] {
            width: 100%;
            padding: 12px;
            margin-bottom: 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
        }
        
        button {
            background-color: #4a6fa5;
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.3s;
        }
        
        button:hover {
            background-color: #2c4c7c;
        }
        
        /* Topic Selection Styles */
        .topic-selection {
            padding: 20px 0;
        }
        
        .topics {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        
        .topics button {
            padding: 15px;
            text-align: left;
            background-color: #f0f5ff;
            color: #4a6fa5;
            border-radius: 6px;
            transition: all 0.3s;
            height: 100%;
        }
        
        .topics button:hover {
            background-color: #e0ebff;
            transform: translateY(-2px);
            box-shadow: 0 5px 10px rgba(0,0,0,0.05);
        }
        
        /* Quiz Container Styles */
        .quiz-container {
            padding: 20px 0;
        }
        
        .quiz-content {
            background-color: #f9f9f9;
            padding: 20px;
            border-radius: 8px;
            margin-bottom: 20px;
        }
        
        .question {
            font-size: 18px;
            font-weight: 500;
            margin-bottom: 20px;
        }
        
        .options {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        
        .option {
            padding: 12px 15px;
            background-color: white;
            border: 1px solid #ddd;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .option:hover {
            background-color: #f0f5ff;
            border-color: #4a6fa5;
        }
        
        .option.correct {
            background-color: #d4edda;
            border-color: #c3e6cb;
            color: #155724;
        }
        
        .option.incorrect {
            background-color: #f8d7da;
            border-color: #f5c6cb;
            color: #721c24;
        }
        
        .feedback {
            margin-top: 20px;
            padding: 15px;
            border-radius: 4px;
            display: none;
        }
        
        .feedback.correct {
            background-color: #d4edda;
            color: #155724;
            display: block;
        }
        
        .feedback.incorrect {
            background-color: #f8d7da;
            color: #721c24;
            display: block;
        }
        
        /* Profile Page Styles */
        .profile {
            padding: 20px 0;
        }
        
        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        
        .stats div {
            background-color: #f0f5ff;
            padding: 15px;
            border-radius: 6px;
            font-size: 16px;
        }
        
        .stats span {
            font-weight: bold;
            color: #4a6fa5;
        }
        
        /* Daily Challenge Styles */
        .daily-challenge {
            padding: 20px 0;
        }
        
        .streak-info {
            margin-top: 20px;
            background-color: #fff3cd;
            color: #856404;
            padding: 10px 15px;
            border-radius: 4px;
            margin-bottom: 20px;
        }
        
        /* Progress Tracker */
        .progress-tracker {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: white;
            border-radius: 50%;
            width: 60px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            z-index: 100;
            cursor: pointer;
        }
        
        .progress-tracker .circle {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: conic-gradient(#4a6fa5 var(--progress), #f0f5ff var(--progress));
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .progress-tracker .inner {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #4a6fa5;
        }
        
        /* Quiz Results */
        .quiz-results {
            text-align: center;
            padding: 30px 0;
        }
        
        .score-display {
            font-size: 24px;
            margin-bottom: 20px;
        }
        
        .score-value {
            font-size: 48px;
            font-weight: bold;
            color: #4a6fa5;
            display: block;
            margin: 10px 0;
        }
        
        /* Loading Animation */
        .loading {
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 40px;
        }
        
        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 4px solid #f0f5ff;
            border-top: 4px solid #4a6fa5;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .sidebar {
                width: 60px;
                padding-top: 70px;
            }
            
            .nav-item span {
                display: none;
            }
            
            .nav-item i {
                margin-right: 0;
            }
            
            .content {
                margin-left: 60px;
            }
        }


        /* Timer Icon Styles for Header */
.timer-icon {
    top: 20px; /* Position from the top of the header */
    left: 20px; /* Position from the right of the header */
    background-color:transparent;
    color: white;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 50px;
    padding:1%;
    height: 50px;
    z-index: 100; /* Ensure it's above other header content */
}

.timer-icon i {
    font-size: 1.5rem;
}

#timer-display {
    font-size: 0.8rem;
    margin-top: 5px;
}

/* AI Help Styles */
.ai-help {
    padding: 20px 0;
}

.ai-chat-container {
    border: 1px solid #ddd;
    border-radius: 8px;
    background-color: #f9f9f9;
    height: 400px;
    display: flex;
    flex-direction: column;
}

.ai-chat-messages {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    background-color: white;
    border-bottom: 1px solid #ddd;
}

.message {
    margin-bottom: 15px;
    padding: 10px 15px;
    border-radius: 6px;
    max-width: 80%;
}

.user-message {
    background-color: #e0ebff;
    color: #4a6fa5;
    align-self: flex-end;
    margin-left: auto;
}

.ai-message {
    background-color: #f0f5ff;
    color: #2c4c7c;
}

.ai-chat-input {
    display: flex;
    padding: 10px;
}

.ai-chat-input input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 10px;
}

.typing-indicator {
    display: none;
    margin-bottom: 15px;
    padding: 10px 15px;
    border-radius: 6px;
    background-color: #f0f5ff;
    color: #2c4c7c;
    width: 60px;
}

.typing-indicator span {
    animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
    0% { content: '.'; }
    33% { content: '..'; }
    66% { content: '...'; }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    width: 300px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.close {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 1.5rem;
    cursor: pointer;
}

.pomodoro-timer {
    font-size: 2.5rem;
    font-weight: bold;
    color: #4361ee;
    margin: 20px 0;
}

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

.pomodoro-controls button {
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    background-color: #4361ee;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.pomodoro-controls button:hover {
    background-color: #3a0ca3;
}

.pomodoro-settings {
    margin-top: 20px;
}

.pomodoro-settings label {
    display: block;
    margin: 10px 0 5px;
    font-size: 0.9rem;
    color: #6c757d;
}

.pomodoro-settings input {
    width: 100%;
    padding: 5px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

#apply-settings {
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    border-radius: 5px;
    background-color: #2ec4b6;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#apply-settings:hover {
    background-color: #1a7a6d;
}

/*for exam session*/
/* Exam Setup Styles */
.exam-setup {
    max-width: 800px;
    margin: 0 auto;
}

.topic-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
    margin-bottom: 30px;
}

.topic-checkbox-item {
    display: flex;
    align-items: center;
    padding: 10px;
    background-color: #f5f5f5;
    border-radius: 5px;
}

.topic-checkbox-item input[type="checkbox"] {
    margin-right: 10px;
}





.exam-difficulty {
    margin-bottom: 30px;
}

.exam-difficulty select {
    width: 200px;
    padding: 8px;
    border-radius: 5px;
    margin-top: 10px;
}

.exam-warning {
    display: flex;
    align-items: center;
    background-color: #fff3cd;
    color: #856404;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 30px;
}

.exam-warning i {
    font-size: 24px;
    margin-right: 15px;
}

/* Exam Session Styles */
/* Exam Setup Page */
.exam-setup {
    max-width: 800px;
    margin: 0 auto;
}

.exam-form {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-top: 20px;
}

.exam-topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
    margin: 15px 0;
    max-height: 300px;
    overflow-y: auto;
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 5px;
}

.exam-topic-item {
    padding: 8px;
    border-radius: 4px;
    background: #f9f9f9;
    display: flex;
    align-items: center;
}

.exam-topic-item input {
    margin-right: 8px;
}

.exam-options {
    margin-top: 20px;
}

.option-group {
    margin-bottom: 15px;
}

.option-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.option-group select {
    width: 100%;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.exam-info {
    background: #f5f8ff;
    border-radius: 6px;
    padding: 15px;
    margin: 20px 0;
}

.info-item {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.info-item i {
    margin-right: 10px;
    color: #4a6bdf;
    width: 20px;
    text-align: center;
}

.start-exam-btn {
    background: #4a6bdf;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 12px 20px;
    font-size: 16px;
    font-weight: 600;
    width: 100%;
    cursor: pointer;
    margin-top: 20px;
    transition: background 0.3s;
}

.start-exam-btn:hover {
    background: #3a5bcf;
}

.start-exam-btn:disabled {
    background: #a0a0a0;
    cursor: not-allowed;
}

/* Exam Interface */
.exam-page {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.exam-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: #f5f8ff;
    border-radius: 8px;
    margin-bottom: 20px;
}

.exam-info {
    display: flex;
    flex-direction: column;
}

.exam-title {
    font-weight: 600;
    font-size: 16px;
}

.exam-timer {
    font-size: 24px;
    font-weight: 700;
    color: #4a6bdf;
}

.time-warning {
    color: #e74c3c;
    animation: pulse 1s infinite;
}

.exam-progress {
    background: #4a6bdf;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 14px;
}

.exam-question-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 20px;
    flex-grow: 1;
}

.exam-category-tag {
    display: inline-block;
    background: #e3e9ff;
    color: #4a6bdf;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    margin-bottom: 15px;
}

.exam-question {
    font-size: 18px;
    margin-bottom: 20px;
    line-height: 1.5;
}

.exam-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.exam-option {
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.exam-option:hover {
    background: #f5f8ff;
    border-color: #4a6bdf;
}

.exam-option.selected {
    background: #4a6bdf;
    color: white;
    border-color: #4a6bdf;
}

.exam-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.exam-navigation button {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.exam-navigation button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-center {
    display: flex;
    gap: 10px;
}

.review-btn {
    background: #f5f8ff;
    color: #4a6bdf;
    border: 1px solid #4a6bdf;
}

.submit-btn {
    background: #4a6bdf;
    color: white;
}

.min-time-notice {
    text-align: center;
    background: #fff3cd;
    color: #856404;
    padding: 10px;
    border-radius: 4px;
    margin-top: 10px;
}

/* Exam Results */
.exam-results {
    max-width: 800px;
    margin: 0 auto;
}

.result-summary {
    display: flex;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin: 20px 0;
}

.score-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-right: 30px;
    border-right: 1px solid #eee;
    margin-right: 30px;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: #f5f8ff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 15px;
}

.score-value {
    font-size: 36px;
    font-weight: 700;
    color: #4a6bdf;
}

.score-label {
    font-size: 16px;
    color: #666;
}

.grade {
    font-size: 48px;
    font-weight: 700;
    color: #4a6bdf;
}

.result-details {
    flex-grow: 1;
    gap:10px;
}

.result-item {
    margin-bottom: 15px;
    font-size: 16px;
}

.result-item i {
    width: 20px;
    text-align: center;
    margin-right: 10px;
    color: #4a6bdf;
}

.result-item span {
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.action-buttons button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
}

#view-answers-btn {
    background: #f5f8ff;
    color: #4a6bdf;
    border: 1px solid #4a6bdf;
}

#new-exam-btn, #home-btn {
    background: #4a6bdf;
    color: white;
}

/* Exam Answers */
.exam-answers-container {
    margin: 20px 0;
    max-height: 600px;
    overflow-y: auto;
}

.exam-answer-item {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 15px;
}

.exam-navigation {
    width: 100%;
    background-color: #f8f9fa;
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    margin: 20px 0;
}

.question-numbers {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    padding: 5px;
}

.question-number {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.25s ease;
    color: #4a5568;
    background-color: #fff;
    border: 2px solid #e2e8f0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.question-number:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    border-color: #cbd5e0;
}

.question-number.current {
    background-color: #3182ce;
    color: white;
    border-color: #2b6cb0;
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(49, 130, 206, 0.3);
}

.question-number.answered {
    background-color: #48bb78;
    color: white;
    border-color: #38a169;
}

.question-number.answered.current {
    background: linear-gradient(135deg, #48bb78 0%, #3182ce 100%);
    border-color: #2b6cb0;
}

/* Animation for current question indicator */
@keyframes pulse {
    0% { transform: scale(1.05); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1.05); }
}

.question-number.current {
    animation: pulse 2s infinite ease-in-out;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .question-numbers {
        gap: 8px;
    }
    
    .question-number {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .question-number {
        width: 30px;
        height: 30px;
        font-size: 12px;
    }
}


.question-category {
    font-size: 14px;
    color: #666;
    margin-bottom: 10px;
}

.question-text {
    font-size: 16px;
    margin-bottom: 15px;
}

.user-answer, .correct-answer {
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 10px;
}

.user-answer span, .correct-answer span {
    font-weight: 600;
    margin-right: 5px;
}

.user-answer.correct {
    background: #d4edda;
    color: #155724;
}

.user-answer.incorrect {
    background: #f8d7da;
    color: #721c24;
}

.correct-answer {
    background: #d4edda;
    color: #155724;
}

.back-btn {
    background: #4a6bdf;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 10px 20px;
    cursor: pointer;
    margin-top: 10px;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}