/* Custom CSS for College Attendance Tracker */

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    --border-radius: 0.35rem;
}

/* Global Styles */
body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
    background-color: #f8f9fc;
    color: #5a5c69;
}

.main-content {
    margin-top: 76px; /* Account for fixed navbar */
    min-height: calc(100vh - 76px);
    padding: 2rem 0;
}

/* Navigation Styles */
.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    transition: color 0.15s ease-in-out;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: rgba(255, 255, 255, 1);
}

/* Card Styles */
.card {
    border: none;
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
}

.card-header {
    background-color: #f8f9fc;
    border-bottom: 1px solid #e3e6f0;
    font-weight: 600;
}

/* Border Left Cards */
.border-left-primary {
    border-left: 0.25rem solid var(--primary-color) !important;
}

.border-left-success {
    border-left: 0.25rem solid var(--success-color) !important;
}

.border-left-info {
    border-left: 0.25rem solid var(--info-color) !important;
}

.border-left-warning {
    border-left: 0.25rem solid var(--warning-color) !important;
}

/* Buttons */
.btn {
    font-weight: 600;
    border-radius: var(--border-radius);
    padding: 0.5rem 1rem;
    transition: all 0.15s ease-in-out;
}

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

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 0.5rem 1rem rgba(0, 123, 255, 0.25);
}

/* Form Styles */
.form-control {
    border: 1px solid #d1d3e2;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

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

.form-select {
    border: 1px solid #d1d3e2;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

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

/* Page Transitions */
.page {
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-spinner {
    text-align: center;
    color: var(--primary-color);
}

/* Button Loading States */
.btn .btn-spinner {
    width: 1rem;
    height: 1rem;
}

/* Progress Bars */
.progress {
    height: 0.5rem;
    border-radius: var(--border-radius);
}

.progress-bar {
    border-radius: var(--border-radius);
}

/* Attendance Status Colors */
.attendance-excellent {
    background-color: var(--success-color);
    color: white;
}

.attendance-good {
    background-color: #20c997;
    color: white;
}

.attendance-warning {
    background-color: var(--warning-color);
    color: #212529;
}

.attendance-danger {
    background-color: var(--danger-color);
    color: white;
}

/* Subject Cards */
.subject-card {
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    cursor: pointer;
}

.subject-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0.5rem 1rem rgba(58, 59, 69, 0.25);
}

/* Attendance Percentage Styling */
.attendance-percentage {
    font-size: 1.5rem;
    font-weight: 700;
}

.attendance-percentage.excellent {
    color: var(--success-color);
}

.attendance-percentage.good {
    color: #20c997;
}

.attendance-percentage.warning {
    color: var(--warning-color);
}

.attendance-percentage.danger {
    color: var(--danger-color);
}

/* Class Status */
.class-status {
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
}

.class-status.present {
    background-color: #d4edda;
    color: #155724;
}

.class-status.absent {
    background-color: #f8d7da;
    color: #721c24;
}

.class-status.late {
    background-color: #fff3cd;
    color: #856404;
}

/* Today's Classes */
.today-class {
    border-left: 4px solid var(--primary-color);
    background-color: #f8f9fc;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    transition: transform 0.2s ease-in-out;
}

.today-class:hover {
    transform: translateX(3px);
}

.today-class.completed {
    border-left-color: var(--success-color);
    background-color: #f0fff4;
}

.today-class.missed {
    border-left-color: var(--danger-color);
    background-color: #ffeaea;
}

/* Upcoming Classes */
.upcoming-class {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background-color: white;
    border-radius: var(--border-radius);
    border: 1px solid #e3e6f0;
    transition: box-shadow 0.2s ease-in-out;
}

.upcoming-class:hover {
    box-shadow: 0 0.25rem 0.5rem rgba(58, 59, 69, 0.15);
}

/* Statistics Cards */
.stat-card {
    text-align: center;
    padding: 1.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: #6c757d;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
}

/* Calendar Styles */
.calendar-day {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 2px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.calendar-day.present {
    background-color: var(--success-color);
    color: white;
}

.calendar-day.absent {
    background-color: var(--danger-color);
    color: white;
}

.calendar-day.today {
    border: 2px solid var(--primary-color);
    font-weight: 700;
}

/* Alert Styles */
.alert {
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.alert-info {
    background-color: #cce7ff;
    color: #004085;
}

/* Toast Styles */
.toast {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.toast-header {
    font-weight: 600;
}

/* Mark Attendance Buttons */
.attendance-btn-group .btn {
    margin: 0.125rem;
    min-width: 80px;
}

.attendance-btn-group .btn.active {
    transform: scale(1.05);
    box-shadow: 0 0.25rem 0.5rem rgba(58, 59, 69, 0.25);
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem 0;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .col-xl-3, .col-md-6 {
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .attendance-percentage {
        font-size: 1.25rem;
    }
    
    .btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.875rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e0e0e0;
        --card-bg: #2d2d2d;
    }
    
    body.dark-mode {
        background-color: var(--bg-color);
        color: var(--text-color);
    }
    
    .dark-mode .card {
        background-color: var(--card-bg);
        color: var(--text-color);
    }
    
    .dark-mode .form-control {
        background-color: var(--card-bg);
        border-color: #495057;
        color: var(--text-color);
    }
    
    .dark-mode .form-select {
        background-color: var(--card-bg);
        border-color: #495057;
        color: var(--text-color);
    }
}

/* Print Styles */
@media print {
    .navbar, .btn, .toast-container {
        display: none !important;
    }
    
    .main-content {
        margin-top: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
    
    .page {
        page-break-inside: avoid;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for better accessibility */
.btn:focus,
.form-control:focus,
.form-select:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid #000;
    }
    
    .btn {
        border-width: 2px;
    }
    
    .form-control {
        border-width: 2px;
    }
}

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