/* CSS Variables for ESATIC Theme */
:root {
    --primary-color: #1e3a8a;
    --secondary-color: #f97316;
    --accent-color: #0ea5e9;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 0.5rem;
    --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
    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: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.8);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover,
.nav-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-btn i {
    font-size: 1.2rem;
}

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

.section {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.section.active {
    display: block;
}

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

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

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

.stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.stat i {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.action-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.action-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.action-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.action-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.action-card p {
    color: var(--text-secondary);
}

/* Subjects Grid */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.subject-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

.subject-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.subject-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.subject-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.subject-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.progress-bar {
    background: var(--border-color);
    height: 6px;
    border-radius: 3px;
    overflow: hidden;
    width: 100%;
}

.progress {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    height: 100%;
    transition: width 0.3s ease;
    width: 0%;
    max-width: 100%;
}

/* Quiz Setup */
.quiz-setup {
    max-width: 600px;
    margin: 0 auto;
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.quiz-setup h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.setup-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
}

.form-group select,
.form-group input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    justify-content: center;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-color);
}

.btn-secondary {
    background: var(--text-secondary);
    color: white;
}

.btn-secondary:hover {
    background: var(--text-primary);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #059669;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

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

.quiz-progress .progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.quiz-progress .progress {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    height: 100%;
    transition: width 0.3s ease;
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.quiz-timer i {
    color: var(--secondary-color);
}

.question-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

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

.subject-tag,
.year-tag {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.subject-tag {
    background: var(--primary-color);
    color: white;
}

.year-tag {
    background: var(--secondary-color);
    color: white;
}

.question-text {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.question-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.option {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.option:hover {
    border-color: var(--primary-color);
    background: rgba(30, 58, 138, 0.05);
}

.option.selected {
    border-color: var(--primary-color);
    background: rgba(30, 58, 138, 0.1);
}

.option.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.option.incorrect {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

.option-letter {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.option.selected .option-letter {
    background: var(--primary-color);
    color: white;
}

.option.correct .option-letter {
    background: var(--success-color);
    color: white;
}

.option.incorrect .option-letter {
    background: var(--error-color);
    color: white;
}

.quiz-actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

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

.results-header {
    text-align: center;
    margin-bottom: 3rem;
}

.results-header h2 {
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    position: relative;
}

.score-circle::before {
    content: '';
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--card-background);
}

.score-circle span {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    z-index: 1;
}

.results-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 3rem;
}

.summary-item {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.summary-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.results-review {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.results-review h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.answer-review {
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.answer-review.correct {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

.answer-review.incorrect {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.05);
}

.answer-review h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.answer-review p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.answer-review .explanation {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
    font-style: italic;
}

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

/* Statistics */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.stat-card h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.stat-card p {
    color: var(--text-secondary);
}

.stats-charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Authentication Styles */
.auth-welcome {
    text-align: center;
    margin-bottom: 3rem;
}

.auth-welcome h1 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.auth-welcome p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.auth-container {
    max-width: 400px;
    margin: 0 auto;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.auth-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.auth-tab {
    flex: 1;
    padding: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.auth-tab.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--background-color);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.auth-message {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 500;
}

.auth-message.success {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.auth-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.user-info {
    max-width: 400px;
    margin: 0 auto;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.user-profile h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.user-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.user-actions .btn {
    flex: 1;
    max-width: 150px;
}

.btn-admin {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-admin:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-admin i {
    font-size: 1.1rem;
}

/* Profile Section */
.profile-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.profile-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.profile-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.profile-avatar {
    font-size: 4rem;
    color: var(--primary-color);
}

.profile-info h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
}

.profile-info p {
    margin: 0 0 0.5rem 0;
    color: var(--text-secondary);
}

.role-badge {
    padding: 0.25rem 0.75rem;
    background: var(--accent-color);
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.role-badge.admin {
    background: var(--warning-color);
}

.profile-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.settings-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox input {
    margin: 0;
}

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

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.system-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-item:last-child {
    border-bottom: none;
}

.info-item label {
    font-weight: 500;
    color: var(--text-secondary);
}

.info-item span {
    color: var(--text-primary);
    font-weight: 600;
}

.btn-danger {
    background: var(--error-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-danger:hover {
    background: #dc2626;
}

/* Notifications */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid var(--success-color);
}

.notification.error {
    border-left: 4px solid var(--error-color);
}

.notification.info {
    border-left: 4px solid var(--accent-color);
}

.notification i {
    font-size: 1.2rem;
}

.notification.success i {
    color: var(--success-color);
}

.notification.error i {
    color: var(--error-color);
}

.notification.info i {
    color: var(--accent-color);
}

/* Dark Theme */
body.theme-dark {
    --background-color: #1a1a1a;
    --card-background: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
}

body.theme-dark .profile-card {
    background: var(--card-background);
    border-color: var(--border-color);
}

body.theme-dark .stat-item {
    background: #333333;
}

body.theme-dark .notification {
    background: var(--card-background);
    border-color: var(--border-color);
}

/* Pending Approval Styles */
.pending-approval {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    max-width: 500px;
    margin: 0 auto;
}

.pending-icon {
    font-size: 4rem;
    color: var(--warning-color);
    margin-bottom: 1.5rem;
}

.pending-approval h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.pending-approval p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.pending-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.pending-actions .btn {
    min-width: 140px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .profile-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .profile-actions {
        flex-direction: column;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .notification {
        right: 10px;
        left: 10px;
        transform: translateY(-100%);
    }
    
    .notification.show {
        transform: translateY(0);
    }

    .pending-actions {
        flex-direction: column;
    }
}

/* Auth Welcome */
.auth-welcome {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem;
    padding: 2rem;
}

.auth-welcome h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.auth-welcome p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Auth Navigation */
.auth-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.welcome-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Chart Container */
.chart-container {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.chart-container h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.stats-history {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.stats-history h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    background: var(--surface-color);
    margin-bottom: 0.5rem;
    border-radius: var(--border-radius);
}

.history-item.score-excellent {
    border-left-color: var(--success-color);
}

.history-item.score-good {
    border-left-color: var(--warning-color);
}

.history-item.score-average {
    border-left-color: var(--info-color);
}

.history-item.score-poor {
    border-left-color: var(--error-color);
}

.history-info {
    flex: 1;
}

.history-subject {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.history-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.history-details {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.history-score {
    text-align: right;
    min-width: 80px;
}

.score-value {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.score-bar {
    width: 60px;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-top: 0.5rem;
    overflow: hidden;
}

.score-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.no-data {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-style: italic;
}

.history-item:last-child {
    border-bottom: none;
}

.history-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.history-score {
    font-weight: 600;
    color: var(--primary-color);
}

/* Revision Section */
.revision-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.revision-tab {
    padding: 1rem 2rem;
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.revision-tab:hover,
.revision-tab.active {
    border-color: var(--primary-color);
    background: rgba(30, 58, 138, 0.05);
}

.revision-tab i {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.revision-content {
    background: var(--card-background);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.revision-panel {
    display: none;
}

.revision-panel.active {
    display: block;
}

.formula-grid,
.tips-grid,
.method-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.formula-card,
.tip-card,
.method-card {
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color);
}

.formula-card h4,
.tip-card h4,
.method-card h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.formula-card ul,
.tip-card ul {
    list-style: none;
    padding: 0;
}

.formula-card li,
.tip-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.formula-card li:last-child,
.tip-card li:last-child {
    border-bottom: none;
}

.method-card ol {
    padding-left: 1.5rem;
}

.method-card li {
    padding: 0.25rem 0;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-primary {
    color: var(--primary-color);
}

.text-secondary {
    color: var(--text-secondary);
}

.text-success {
    color: var(--success-color);
}

.text-error {
    color: var(--error-color);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    color: white;
    font-size: 1.1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
    }

    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-btn span {
        display: none;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        align-items: center;
    }

    .quick-actions {
        grid-template-columns: 1fr;
    }

    .subjects-grid {
        grid-template-columns: 1fr;
    }

    .quiz-header {
        flex-direction: column;
        gap: 1rem;
    }

    .quiz-actions {
        flex-direction: column;
    }

    .results-summary {
        grid-template-columns: 1fr;
    }

    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-charts {
        grid-template-columns: 1fr;
    }

    .revision-tabs {
        flex-direction: column;
    }

    .formula-grid,
    .tips-grid,
    .method-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .main {
        padding: 1rem 0;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .stats-overview {
        grid-template-columns: 1fr;
    }

    .question-card {
        padding: 1.5rem;
    }

    .quiz-setup {
        padding: 1.5rem;
    }
}

/* Coach IA Styles */
.coach-dashboard {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.coach-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.coach-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.coach-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
}

.coach-card h3 i {
    color: var(--secondary-color);
}

.coach-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.tips-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tip {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--success-color);
}

.tip i {
    color: var(--success-color);
    font-size: 1.1rem;
}

.tip span {
    color: var(--text-primary);
    font-weight: 500;
}

.analysis-content {
    min-height: 150px;
    margin-bottom: 1.5rem;
}

.analysis-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 150px;
    color: var(--text-secondary);
}

.spinner-small {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ChatBot Styles */
.chatbot-container {
    display: flex;
    flex-direction: column;
    height: 400px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: var(--background-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    max-width: 85%;
}

.chat-message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.chat-message.user .message-content {
    background: var(--primary-color);
    color: white;
}

.chat-message.assistant .message-content {
    background: var(--card-background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.message-content {
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    line-height: 1.4;
    word-wrap: break-word;
}

.message-content i {
    font-size: 0.9rem;
    opacity: 0.8;
}

.chat-input-container {
    border-top: 1px solid var(--border-color);
    background: var(--card-background);
    padding: 1rem;
}

.chat-counter {
    text-align: center;
    margin-bottom: 0.5rem;
}

.chat-counter span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: var(--background-color);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.chat-input-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.chat-input-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    outline: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.chat-input-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
}

.chat-input-group button {
    padding: 0.75rem;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.chat-input-group button:hover {
    transform: scale(1.05);
}

.chat-input-group button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Scrollbar for chat messages */
.chat-messages::-webkit-scrollbar {
    width: 4px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--background-color);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Message animation */
.chat-message {
    animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    color: var(--text-secondary);
}

.typing-dots {
    display: flex;
    gap: 0.25rem;
}

.typing-dot {
    width: 4px;
    height: 4px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typingDot 1.4s infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingDot {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Responsive design for ChatBot */
@media (max-width: 768px) {
    .chatbot-container {
        height: 300px;
    }
    
    .chat-message {
        max-width: 90%;
    }
    
    .message-content {
        padding: 0.5rem 0.75rem;
    }
    
    .chat-input-container {
        padding: 0.75rem;
    }
}

.analysis-result {
    padding: 1.5rem;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border-radius: var(--border-radius);
    border: 1px solid var(--accent-color);
    margin-bottom: 1.5rem;
}

.analysis-result h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.analysis-result p {
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.strengths-weaknesses {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.strength-item, .weakness-item {
    padding: 1rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.strength-item {
    background: linear-gradient(135deg, #f0fdf4, #dcfce7);
    border: 1px solid var(--success-color);
}

.strength-item i {
    color: var(--success-color);
}

.weakness-item {
    background: linear-gradient(135deg, #fef2f2, #fee2e2);
    border: 1px solid var(--warning-color);
}

.weakness-item i {
    color: var(--warning-color);
}

.recommendations {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.recommendation-item {
    padding: 1.25rem;
    background: linear-gradient(135deg, #fafcff, #f1f5f9);
    border-radius: var(--border-radius);
    border: 1px solid var(--accent-color);
    position: relative;
}

.recommendation-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--accent-color);
    border-radius: var(--border-radius) 0 0 var(--border-radius);
}

.recommendation-item h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.recommendation-item p {
    color: var(--text-primary);
    line-height: 1.6;
}

.motivation-card {
    background: linear-gradient(135deg, #fefce8, #fef3c7);
    border: 1px solid var(--warning-color);
}

.motivation-content {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--border-radius);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.motivation-content p {
    color: var(--text-primary);
    font-size: 1.1rem;
    line-height: 1.7;
    font-weight: 500;
    text-align: center;
}

.no-data {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.progress-indicator {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: width 0.3s ease;
}

.score-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.9rem;
}

.score-excellent {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.score-good {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
}

.score-average {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.score-poor {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

/* Responsive Design for Coach IA */
/* Simple Statistics Bars */
.simple-bars {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 500px;
    margin: 0 auto;
}

.bar-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bar-item label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.bar-container {
    position: relative;
    background: var(--border-color);
    height: 40px;
    border-radius: var(--border-radius);
    overflow: hidden;
    display: flex;
    align-items: center;
}

.bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--border-radius);
    transition: width 1s ease-in-out;
    min-width: 0;
}

.score {
    position: absolute;
    right: 12px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.score-timeline {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.score-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.score-item:hover {
    box-shadow: var(--shadow-sm);
}

.score-item-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.score-item-subject {
    font-weight: 600;
    color: var(--text-primary);
}

.score-item-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.score-item-value {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.1rem;
}

.score-excellent .score-item-value {
    color: var(--success-color);
}

.score-good .score-item-value {
    color: var(--accent-color);
}

.score-average .score-item-value {
    color: var(--warning-color);
}

.score-poor .score-item-value {
    color: var(--error-color);
}

@media (max-width: 768px) {
    .coach-grid {
        grid-template-columns: 1fr;
    }

    .coach-card {
        padding: 1.5rem;
    }

    .coach-card h3 {
        font-size: 1.1rem;
    }

    .tip {
        padding: 0.75rem;
    }

    .recommendation-item {
        padding: 1rem;
    }

    .motivation-content {
        padding: 0.75rem;
    }

    .motivation-content p {
        font-size: 1rem;
    }

    .simple-bars {
        max-width: 100%;
    }

    .score-item {
        padding: 0.75rem;
    }
}