/* Custom Bootstrap Styles for School Management System */

:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --body-bg: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-muted: #6c757d;
    --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: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
}

/* Global Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--body-bg);
    color: var(--dark-color);
    line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--dark-color);
}

.h1, .h2, .h3, .h4, .h5, .h6 {
    font-weight: 600;
}

/* Cards */
.card {
    border: none;
    box-shadow: var(--shadow-sm);
    border-radius: var(--border-radius);
    background-color: var(--card-bg);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
    padding: 1.5rem 2rem;
}

.card-header:first-child {
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
}

.card-body {
    padding: 2rem;
}

.card-footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    border-radius: 0 0 var(--border-radius) var(--border-radius) !important;
    padding: 1rem 2rem;
}

/* Buttons */
.btn {
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s ease;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: none;
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #6a4190 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Forms */
.form-control, .form-select {
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    padding: 0.875rem 1rem;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-control::placeholder {
    color: #a0aec0;
}

.form-label {
    font-weight: 500;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

/* Input Groups */
.input-group-text {
    background-color: var(--light-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-muted);
}

/* Tables */
.table {
    font-size: 0.9rem;
    margin-bottom: 0;
}

.table th {
    border-top: none;
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    padding: 1rem 1.5rem;
    background-color: var(--light-color);
}

.table td {
    padding: 1rem 1.5rem;
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: rgba(102, 126, 234, 0.05);
}

/* Badges */
.badge {
    border-radius: 20px;
    padding: 0.5rem 1rem;
    font-weight: 500;
    font-size: 0.8rem;
}

/* Alerts */
.alert {
    border-radius: var(--border-radius);
    border: none;
    padding: 1rem 1.5rem;
}

.alert-dismissible .btn-close {
    padding: 1rem;
}

/* Navbar */
.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

/* Sidebar */
.sidebar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: calc(100vh - 76px);
    padding: 2rem 0;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.8);
    padding: 1rem 2rem;
    border-radius: var(--border-radius-sm);
    margin: 0.25rem 1rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
}

.sidebar .nav-link i {
    margin-right: 0.75rem;
    font-size: 1.1rem;
}

/* Dropdown */
.dropdown-menu {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
}

.dropdown-item {
    border-radius: var(--border-radius-sm);
    padding: 0.75rem 1rem;
    margin: 0.125rem 0;
    font-weight: 500;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

.dropdown-item i {
    margin-right: 0.5rem;
}

/* Pagination */
.pagination {
    margin-top: 2rem;
}

.page-link {
    border-radius: var(--border-radius-sm);
    margin: 0 0.125rem;
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    font-weight: 500;
    padding: 0.75rem 1rem;
}

.page-link:hover {
    background-color: var(--light-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-item.active .page-link {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-color: var(--primary-color);
    color: white;
}

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

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 2rem 1.5rem;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.modal-body {
    padding: 2rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: 4px;
    background-color: var(--border-color);
}

.progress-bar {
    border-radius: 4px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

/* Breadcrumb */
.breadcrumb {
    background-color: transparent;
    padding: 0;
    margin-bottom: 1.5rem;
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.breadcrumb-item a:hover {
    color: var(--secondary-color);
}

/* Stats Cards */
.stat-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: var(--border-radius);
}

.stat-card .stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1;
}

.stat-card .stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    max-width: 900px;
    width: 100%;
}

.login-form {
    padding: 3rem;
}

.login-image {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    padding: 3rem;
    text-align: center;
}

.login-image h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.login-image p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Timeline */
.timeline-item {
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 60px;
    bottom: -20px;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item:last-child::before {
    display: none;
}

/* Footer */
.footer {
    background-color: #2d3748;
    color: white;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .login-image {
        display: none;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .card-header {
        padding: 1.5rem;
    }
    
    .btn {
        padding: 0.75rem 1.25rem;
    }
    
    .table-responsive {
        border-radius: var(--border-radius);
    }
    
    .table th,
    .table td {
        padding: 0.75rem;
    }
}

@media (max-width: 576px) {
    .container-fluid {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .modal-body {
        padding: 1.5rem;
    }
    
    .login-form {
        padding: 2rem;
    }
}

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

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from { transform: translateX(-100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Utility Classes */
.text-primary-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-primary-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.shadow-primary {
    box-shadow: 0 0.5rem 1rem rgba(102, 126, 234, 0.25);
}

.border-primary {
    border-color: var(--primary-color) !important;
}

/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Print Styles */
@media print {
    .sidebar,
    .navbar,
    .btn,
    .card-footer {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
    
    body {
        background-color: white;
    }
}