:root {
    --primary-color: #4f46e5;
    --primary-dark: #4338ca;
    --secondary-color: #6366f1;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-color: #1f2937;
    --light-color: #f3f4f6;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 0.5rem;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: 260px;
    background-color: var(--white);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 10;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-color);
}

.tagline {
    font-size: 0.875rem;
    color: #6b7280;
    margin-top: 0.25rem;
}

.nav-menu {
    flex: 1;
    padding: 1rem 0;
    list-style: none;
}

.nav-item {
    margin: 0.25rem 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: #4b5563;
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background-color: #f9fafb;
    color: var(--primary-color);
}

.nav-link.active {
    background-color: #eef2ff;
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-link i {
    font-size: 1.125rem;
    width: 20px;
    text-align: center;
}

.user-profile {
    padding: 1.5rem;
    border-top: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-info {
    flex: 1;
}

.user-name {
    font-weight: 600;
    color: var(--dark-color);
}

.user-role {
    font-size: 0.875rem;
    color: #6b7280;
}

/* Main Content Styles */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-bar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.search-container {
    position: relative;
    width: 300px;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
}

.search-input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.5rem;
    border: 1px solid #e5e7eb;
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: transparent;
    border: 1px solid #e5e7eb;
    color: #4b5563;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.icon-btn:hover {
    background-color: #f9fafb;
    color: var(--primary-color);
}

.icon-btn.small {
    width: 32px;
    height: 32px;
    font-size: 0.875rem;
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: var(--danger-color);
    color: var(--white);
    font-size: 0.625rem;
    font-weight: 600;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.primary-btn, .secondary-btn, .danger-btn {
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

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

.secondary-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.secondary-btn:hover {
    background-color: #eef2ff;
}

.danger-btn {
    background-color: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.danger-btn:hover {
    background-color: #fee2e2;
}

.primary-btn.small, .secondary-btn.small, .danger-btn.small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

/* Content Styles */
.content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

.page-header {
    margin-bottom: 1.5rem;
}

.page-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 0.25rem;
}

.page-subtitle {
    color: #6b7280;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--white);
}

.stat-icon.blue {
    background-color: #3b82f6;
}

.stat-icon.green {
    background-color: var(--success-color);
}

.stat-icon.purple {
    background-color: #8b5cf6;
}

.stat-icon.orange {
    background-color: var(--warning-color);
}

.stat-content {
    flex: 1;
}

.stat-title {
    font-size: 0.875rem;
    color: #6b7280;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.stat-change {
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.stat-change.positive {
    color: var(--success-color);
}

.stat-change.negative {
    color: var(--danger-color);
}

.stat-change.neutral {
    color: #6b7280;
}

/* Charts */
.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-card {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--dark-color);
}

.card-actions {
    display: flex;
    gap: 0.5rem;
}

.chart-container {
    padding: 1.5rem;
    height: 300px;
    position: relative;
}

/* Recent Exams Table */
.recent-exams {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background-color: #f9fafb;
    padding: 0.75rem 1.5rem;
    text-align: left;
    font-weight: 600;
    color: #4b5563;
    font-size: 0.875rem;
}

.data-table td {
    padding: 0.75rem 1.5rem;
    border-top: 1px solid #e5e7eb;
    font-size: 0.875rem;
}

.data-table tr:hover {
    background-color: #f9fafb;
}

.performance-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.performance-badge.excellent {
    background-color: #d1fae5;
    color: #065f46;
}

.performance-badge.good {
    background-color: #dbeafe;
    color: #1e40af;
}

.performance-badge.average {
    background-color: #fef3c7;
    color: #92400e;
}

.performance-badge.poor {
    background-color: #fee2e2;
    color: #b91c1c;
}

.table-actions {
    display: flex;
    gap: 0.5rem;
}

.table-actions .icon-btn {
    width: 32px;
    height: 32px;
    font-size: 0.875rem;
}

/* History Page */
.history-controls {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
}

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

.filter-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: #4b5563;
}

.filter-select, .date-input {
    padding: 0.5rem;
    border: 1px solid #e5e7eb;
    border-radius: var(--radius);
    font-size: 0.875rem;
    width: 100%;
}

.date-range {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.date-range .date-input {
    width: 150px;
}

/* Analytics Page */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    gap: 1.5rem;
}

.analytics-card {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.metrics-container {
    padding: 1.5rem;
}

.metric {
    margin-bottom: 1.5rem;
}

.metric:last-child {
    margin-bottom: 0;
}

.metric-label {
    font-size: 0.875rem;
    color: #4b5563;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.metric-bar {
    height: 8px;
    background-color: #e5e7eb;
    border-radius: 9999px;
    overflow: hidden;
}

.metric-fill {
    height: 100%;
    background-color: var(--primary-color);
}

.metric-fill.positive {
    background-color: var(--success-color);
}

.metric-fill.negative {
    background-color: var(--danger-color);
}

/* Settings Page */
.settings-container {
    max-width: 800px;
}

.settings-section {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.settings-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #e5e7eb;
}

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

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
}

.setting-info {
    flex: 1;
}

.setting-name {
    font-weight: 500;
    color: var(--dark-color);
    margin-bottom: 0.25rem;
}

.setting-desc {
    font-size: 0.875rem;
    color: #6b7280;
}

.setting-actions {
    display: flex;
    gap: 0.5rem;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #e5e7eb;
    transition: var(--transition);
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: var(--white);
    transition: var(--transition);
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--primary-color);
}

input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

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

.app-version h3 {
    font-weight: 600;
    color: var(--dark-color);
}

.app-version p {
    font-size: 0.875rem;
    color: #6b7280;
}

.app-links {
    display: flex;
    gap: 1rem;
}

.link-text {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
}

.link-text:hover {
    text-decoration: underline;
}

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

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalFadeIn 0.3s ease;
}

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

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-color);
}

.close-modal {
    background: none;
    border: none;
    color: #6b7280;
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--dark-color);
}

.modal-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #4b5563;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e5e7eb;
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.hidden {
    display: none !important;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    transform: translateX(150%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

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

.toast-icon {
    font-size: 1.5rem;
    color: var(--success-color);
}

.toast-message {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.25rem;
}

.toast-desc {
    font-size: 0.875rem;
    color: #6b7280;
}

.toast-close {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    transition: var(--transition);
}

.toast-close:hover {
    color: #4b5563;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .charts-container,
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        height: 250px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        height: 100vh;
        z-index: 20;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .history-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-container {
        width: 100%;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .toast {
        right: 1rem;
        left: 1rem;
        min-width: auto;
    }
}