/* Quiz Platform Styles */

:root {
    --primary-color: #007bff;
    --instructor-color: #28a745;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gradient-primary: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    --gradient-success: linear-gradient(135deg, #28a745 0%, #1e7e34 100%);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --border-radius: 0.375rem;
    --transition: all 0.3s ease;
}

/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
}

.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    border: none;
    padding: 0.5rem 1.5rem;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.1;
}

.hero-image img {
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Feature Cards */
.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--border-radius);
    background: white;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2rem;
}

/* Auth Pages */
.auth-page {
    background: var(--gradient-primary);
    min-height: 100vh;
}

.auth-form-container {
    background: white;
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
}

.auth-image {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.demo-credentials {
    background: var(--light-color);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid #dee2e6;
}

/* Dashboard Styles */
.sidebar {
    min-height: calc(100vh - 56px);
    background: var(--light-color) !important;
    border-right: 1px solid #dee2e6;
}

.sidebar-menu {
    padding: 1rem 0;
}

.menu-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--dark-color);
    text-decoration: none;
    transition: var(--transition);
    border-radius: 0 25px 25px 0;
    margin-right: 1rem;
}

.menu-item:hover, .menu-item.active {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

/* Instructor-specific styling */
.navbar-dark.bg-success .navbar-brand,
.navbar-dark.bg-success .nav-link {
    color: white;
}

.instructor-sidebar .menu-item:hover,
.instructor-sidebar .menu-item.active {
    background: var(--instructor-color);
}

.menu-item i {
    width: 20px;
    text-align: center;
    margin-right: 0.5rem;
}

.main-content {
    padding: 2rem;
    background: #f8f9fa;
    min-height: calc(100vh - 56px);
}

/* Stat Cards */
.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    transition: var(--transition);
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    font-size: 1.5rem;
    color: white;
}

.stat-content h3 {
    margin: 0;
    font-weight: bold;
    font-size: 2rem;
}

.stat-content p {
    margin: 0;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* Welcome Card */
.welcome-card {
    background: var(--gradient-primary);
    color: white;
    border: none;
}

/* Exam Cards */
.exam-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.exam-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.exam-status {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 500;
}

.exam-status.completed {
    background: var(--success-color);
    color: white;
}

.exam-status.available {
    background: var(--warning-color);
    color: var(--dark-color);
}

.exam-status.upcoming {
    background: var(--info-color);
    color: white;
}

/* Timer Display */
.timer-display {
    font-size: 1.2rem;
    font-weight: bold;
    color: #fff;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

.timer-warning {
    color: var(--warning-color) !important;
    animation: pulse 1s infinite;
}

.timer-danger {
    color: var(--danger-color) !important;
    animation: pulse 0.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Question Styles */
.question-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
    overflow: hidden;
    transition: var(--transition);
}

.question-header {
    background: var(--light-color);
    padding: 1rem;
    border-bottom: 1px solid #dee2e6;
    font-weight: 500;
}

.question-body {
    padding: 1.5rem;
}

.option-item {
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    background: white;
}

.option-item:hover {
    border-color: var(--primary-color);
    background: rgba(0, 123, 255, 0.05);
}

.option-item.selected {
    border-color: var(--primary-color);
    background: rgba(0, 123, 255, 0.1);
    color: var(--primary-color);
    font-weight: 500;
}

.option-item input[type="radio"] {
    margin-right: 0.5rem;
}

/* Leaderboard Styles */
.leaderboard-item {
    background: white;
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.leaderboard-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.rank-badge {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 1rem;
}

.rank-badge.gold {
    background: #ffd700;
    color: #000;
}

.rank-badge.silver {
    background: #c0c0c0;
    color: #000;
}

.rank-badge.bronze {
    background: #cd7f32;
    color: #fff;
}

.rank-badge.default {
    background: var(--light-color);
    color: var(--dark-color);
}

.medal-icon {
    font-size: 1.5rem;
    margin-left: auto;
}

.medal-icon.gold { color: #ffd700; }
.medal-icon.silver { color: #c0c0c0; }
.medal-icon.bronze { color: #cd7f32; }

/* Results Modal */
.result-summary {
    text-align: center;
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.result-summary.passed {
    background: var(--gradient-success);
    color: white;
}

.result-summary.failed {
    background: linear-gradient(135deg, var(--danger-color) 0%, #c82333 100%);
    color: white;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 8px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2rem;
    font-weight: bold;
}

/* Profile Styles */
.profile-header {
    background: var(--gradient-primary);
    color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.profile-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 4px solid white;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.achievement-badge {
    background: var(--warning-color);
    color: var(--dark-color);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    margin: 0.25rem;
    display: inline-block;
}

/* Certificate Styles */
.certificate-item {
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.certificate-item:hover {
    box-shadow: var(--shadow-md);
    transform: scale(1.02);
}

.certificate-header {
    color: var(--primary-color);
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* Anti-Cheating Styles */
.exam-security-notice {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section .display-4 {
        font-size: 2.5rem;
    }
    
    .auth-form-container {
        padding: 2rem;
        margin: 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
    
    .stat-icon {
        margin-right: 0;
        margin-bottom: 1rem;
    }
    
    .sidebar {
        min-height: auto;
    }
    
    .menu-item {
        border-radius: var(--border-radius);
        margin: 0.25rem;
    }
}

@media (max-width: 576px) {
    .feature-card {
        padding: 1.5rem;
    }
    
    .profile-header {
        text-align: center;
    }
    
    .exam-card {
        margin-bottom: 1rem;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Form Enhancements */
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Table Enhancements */
.table th {
    background: var(--light-color);
    border: none;
    font-weight: 600;
    color: var(--dark-color);
}

.table td {
    border: none;
    border-bottom: 1px solid #e9ecef;
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background: rgba(0, 123, 255, 0.05);
}

/* Badge Styles */
.badge {
    font-size: 0.75rem;
    padding: 0.35rem 0.65rem;
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: 4px;
    background: #e9ecef;
}

.progress-bar {
    border-radius: 4px;
}

/* Modal Enhancements */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid #e9ecef;
}

.modal-footer {
    border-top: 1px solid #e9ecef;
}

/* Utility Classes */
.text-shadow {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-success {
    background: var(--gradient-success);
}

.cursor-pointer {
.password-strength {
    height: 4px;
    border-radius: 2px;
    margin-top: 5px;
    transition: all 0.3s ease;
}
    cursor: pointer;
.password-strength.weak { background: #dc3545; }
.password-strength.medium { background: #ffc107; }
.password-strength.strong { background: #28a745; }
}
/* Notification styles */
.notification-item {
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.notification-item:hover {
    background: rgba(0, 123, 255, 0.05) !important;
}
.user-select-none {
.notification-item.unread {
    background: rgba(0, 123, 255, 0.1);
    font-weight: 500;
}
    user-select: none;
/* Certificate verification styles */
.certificate-verification {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
}
}
/* Enhanced table styles */
.table-hover tbody tr:hover {
    background: rgba(0, 123, 255, 0.05);
    transform: scale(1.01);
    transition: var(--transition);
}

/* Advanced analytics styles */
.analytics-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: var(--transition);
}
/* Enhanced form styles */
.analytics-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.form-control:focus {
.progress-ring {
    width: 120px;
    height: 120px;
    margin: 0 auto;
}
    border-color: var(--primary-color);
.progress-ring circle {
    fill: transparent;
    stroke: #e9ecef;
    stroke-width: 8;
}
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
.progress-ring .progress {
    stroke: var(--primary-color);
    stroke-linecap: round;
    transition: stroke-dasharray 0.5s ease;
}
}
/* Print Styles */
@media print {
    .navbar, .sidebar, .modal-header, .modal-footer {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
        background: white;
    }
    
    .card {
        border: 1px solid #ccc;
        box-shadow: none;
    }
}