/* Color Palette Variables */
:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    
    /* Gradient Variations */
    --primary-gradient: linear-gradient(135deg, #2196F3 0%, #21CBF3 100%);
    --success-gradient: linear-gradient(135deg, #4CAF50 0%, #8BC34A 100%);
    --warning-gradient: linear-gradient(135deg, #FFC107 0%, #FFD54F 100%);
    --danger-gradient: linear-gradient(135deg, #F44336 0%, #FF7043 100%);
    --purple-gradient: linear-gradient(135deg, #9C27B0 0%, #BA68C8 100%);
    
    /* Additional Colors */
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --muted-text: #6c757d;
    --border-color: #dee2e6;
    
    /* Spacing */
    --header-height: 76px;
    --footer-height: 60px;
}

/* Global Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding-top: var(--header-height);
    padding-bottom: var(--footer-height);
}

/* Gradient Backgrounds */
.bg-primary-gradient {
    background: var(--primary-gradient) !important;
}

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

.bg-warning-gradient {
    background: var(--warning-gradient) !important;
}

.bg-danger-gradient {
    background: var(--danger-gradient) !important;
}

.bg-purple-gradient {
    background: var(--purple-gradient) !important;
}

/* Header Styles */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-size: 1.5rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.navbar-nav .nav-link {
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 0.375rem;
    margin: 0 0.25rem;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - var(--header-height) - var(--footer-height));
    padding: 2rem 0;
}

.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.content-section.active {
    display: block;
}

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

/* Card Styles */
.card {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

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

/* Button Styles */
.btn {
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    box-shadow: 0 2px 4px rgba(33, 150, 243, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(33, 150, 243, 0.4);
}

.btn-success {
    background: var(--success-gradient);
    box-shadow: 0 2px 4px rgba(76, 175, 80, 0.3);
}

.btn-warning {
    background: var(--warning-gradient);
    color: var(--dark-text);
    box-shadow: 0 2px 4px rgba(255, 193, 7, 0.3);
}

.btn-danger {
    background: var(--danger-gradient);
    box-shadow: 0 2px 4px rgba(244, 67, 54, 0.3);
}

/* Calendar Styles */
#calendar {
    background: white;
    border-radius: 0.75rem;
    padding: 1rem;
}

.fc-toolbar {
    margin-bottom: 1.5rem !important;
}

.fc-toolbar-title {
    font-size: 1.5rem !important;
    font-weight: 600 !important;
    color: var(--dark-text) !important;
}

.fc-button-primary {
    background: var(--primary-gradient) !important;
    border: none !important;
    border-radius: 0.5rem !important;
    font-weight: 500 !important;
    transition: all 0.3s ease !important;
}

.fc-button-primary:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 4px 8px rgba(33, 150, 243, 0.4) !important;
}

.fc-day {
    transition: all 0.3s ease;
}

.fc-day:hover {
    background-color: rgba(33, 150, 243, 0.1) !important;
}

.fc-daygrid-day-number {
    font-weight: 500;
    color: var(--dark-text);
}

.fc-event {
    border-radius: 0.375rem !important;
    border: none !important;
    font-weight: 500 !important;
    cursor: pointer !important;
    transition: all 0.3s ease !important;
}

.fc-event:hover {
    transform: scale(1.05) !important;
}

/* Event Type Styles */
.event-present {
    background: var(--success-gradient) !important;
    color: white !important;
}

.event-absent {
    background: var(--danger-gradient) !important;
    color: white !important;
}

.event-cancelled {
    background: var(--warning-gradient) !important;
    color: var(--dark-text) !important;
}

.event-scheduled {
    background: rgba(33, 150, 243, 0.2) !important;
    color: var(--primary-color) !important;
    border: 2px dashed var(--primary-color) !important;
}

/* Student Card Styles */
.student-card {
    transition: all 0.3s ease;
    cursor: pointer;
}

.student-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
}

.student-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.student-info h6 {
    color: var(--dark-text);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.student-info p {
    color: var(--muted-text);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.payment-status {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.payment-status.paid {
    background: var(--success-color);
    color: white;
}

.payment-status.pending {
    background: var(--warning-color);
    color: var(--dark-text);
}

.payment-status.overdue {
    background: var(--danger-color);
    color: white;
}

/* Modal Styles */
.modal-content {
    border-radius: 1rem;
    border: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.modal-header {
    border-radius: 1rem 1rem 0 0;
    border-bottom: none;
    padding: 1.5rem;
}

.modal-title {
    font-weight: 600;
}

.modal-body {
    padding: 2rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    border-radius: 0 0 1rem 1rem;
    padding: 1.5rem;
}

/* Form Styles */
.form-control,
.form-select {
    border-radius: 0.5rem;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    padding: 0.75rem 1rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(33, 150, 243, 0.25);
    transform: translateY(-1px);
}

.form-label {
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 0.5rem;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Offcanvas Styles */
.offcanvas {
    border-radius: 1rem 0 0 1rem;
    border: none;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
}

.offcanvas-header {
    border-radius: 1rem 0 0 0;
    border-bottom: none;
    padding: 1.5rem;
}

.offcanvas-body {
    padding: 2rem;
}

/* Badge Styles */
.badge {
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
}

/* Report Styles */
.report-card {
    background: white;
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
}

.report-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--light-bg);
    border-radius: 0.5rem;
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--muted-text);
    text-transform: uppercase;
    font-weight: 600;
}

/* Toast Styles */
.toast {
    border-radius: 0.75rem;
    border: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Loading Spinner */
#loadingSpinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
}

#loadingSpinner.show {
    display: flex !important;
    align-items: center;
    justify-content: center;
}

/* Footer Styles */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%) !important;
    border-top: 3px solid var(--primary-color);
    margin-top: auto;
}

.footer p {
    margin: 0;
    font-weight: 500;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #21CBF3;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem 0;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .offcanvas-body {
        padding: 1rem;
    }
    
    .fc-toolbar {
        flex-direction: column;
        gap: 1rem;
    }
    
    .fc-toolbar-chunk {
        display: flex;
        justify-content: center;
    }
    
    .student-card {
        margin-bottom: 1rem;
    }
    
    .report-stats {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .modal-dialog {
        margin: 0.5rem;
    }
    
    .card {
        border-radius: 0.75rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .report-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Keyboard Navigation */
.btn:focus,
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--dark-text);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .btn,
    .modal,
    .offcanvas,
    .toast-container {
        display: none !important;
    }
    
    .main-content {
        padding-top: 0;
        padding-bottom: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    body {
        background: white;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1976D2;
}

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

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bounce-in {
    animation: bounceIn 0.6s ease-out;
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Utility Classes */
.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-sm {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.shadow {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1) !important;
}

.shadow-lg {
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1) !important;
}

.border-gradient {
    border: 2px solid;
    border-image: var(--primary-gradient) 1;
}