/* Base Styles and Variables */

:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    
    --border-radius: 8px;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --transition: all 0.3s ease;
}

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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
}

body {
    background-color: #f5f7fa;
}

/* Typography */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: darken(var(--primary-color), 10%);
    text-decoration: none;
}

/* Containers */

.container-lg {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */

.navbar {
    background-color: #fff;
    border-bottom: 1px solid #e0e0e0;
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.navbar-brand i {
    margin-right: 0.5rem;
}

.navbar-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Buttons */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0b5ed7;
}

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

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

.btn-outline-secondary {
    background-color: transparent;
    color: var(--secondary-color);
    border-color: var(--secondary-color);
}

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

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

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Forms */

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.6;
    color: #333;
    background-color: white;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.1);
}

.form-check-input {
    width: 20px;
    height: 20px;
    margin-top: 0.3rem;
    margin-right: 0.5rem;
    cursor: pointer;
}

.form-check-label {
    cursor: pointer;
    margin-bottom: 0;
}

.form-text {
    display: block;
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 0.25rem;
}

/* Alerts */

.alert {
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius);
    border: 2px solid;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.alert-info {
    background-color: #d1ecf1;
    border-color: #bee5eb;
    color: #0c5460;
}

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

.alert-dismissible .btn-close {
    padding: 0.5rem;
    cursor: pointer;
    background: none;
    border: none;
    font-size: 1.5rem;
}

/* Cards */

.card {
    background-color: white;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.card-header {
    background-color: white;
    border-bottom: 1px solid #e0e0e0;
    padding: 1.5rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h3 {
    margin: 0;
    font-size: 1.3rem;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    padding: 1rem 1.5rem;
}

/* Badges */

.badge {
    display: inline-block;
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50px;
    white-space: nowrap;
}

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

.badge-success {
    background-color: var(--success-color);
    color: white;
}

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

.badge-warning {
    background-color: var(--warning-color);
    color: #333;
}

.badge-secondary {
    background-color: var(--secondary-color);
    color: white;
}

/* Tables */

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 0;
}

.table thead th {
    background-color: #f8f9fa;
    border-bottom: 2px solid #e0e0e0;
    padding: 1rem;
    font-weight: 600;
    text-align: left;
    white-space: nowrap;
}

.table tbody td {
    padding: 1rem;
    border-bottom: 1px solid #e0e0e0;
}

.table tbody tr:hover {
    background-color: #f8f9fa;
}

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

.table-hover tbody tr:hover {
    background-color: #f8f9fa;
}

/* Pagination */

.pagination {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.page-item {
    display: inline-block;
}

.page-link {
    display: inline-block;
    padding: 0.5rem 0.75rem;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    color: var(--primary-color);
    transition: var(--transition);
}

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

.page-item.active .page-link {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.page-item.disabled .page-link {
    color: #ccc;
    pointer-events: none;
    cursor: not-allowed;
}

/* Grid System */

.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -0.75rem;
    margin-left: -0.75rem;
}

.col {
    flex: 1;
    padding-right: 0.75rem;
    padding-left: 0.75rem;
}

.col-lg-2 { flex: 0 0 16.666%; max-width: 16.666%; }
.col-lg-3 { flex: 0 0 25%; max-width: 25%; }
.col-lg-4 { flex: 0 0 33.333%; max-width: 33.333%; }
.col-lg-5 { flex: 0 0 41.666%; max-width: 41.666%; }
.col-lg-6 { flex: 0 0 50%; max-width: 50%; }
.col-lg-8 { flex: 0 0 66.666%; max-width: 66.666%; }
.col-lg-9 { flex: 0 0 75%; max-width: 75%; }
.col-lg-10 { flex: 0 0 83.333%; max-width: 83.333%; }
.col-lg-12 { flex: 0 0 100%; max-width: 100%; }

.col-md-2 { flex: 0 0 16.666%; max-width: 16.666%; }
.col-md-3 { flex: 0 0 25%; max-width: 25%; }
.col-md-4 { flex: 0 0 33.333%; max-width: 33.333%; }
.col-md-6 { flex: 0 0 50%; max-width: 50%; }
.col-md-9 { flex: 0 0 75%; max-width: 75%; }
.col-md-12 { flex: 0 0 100%; max-width: 100%; }

/* Utilities */

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: #6c757d;
}

.text-success {
    color: var(--success-color);
}

.text-danger {
    color: var(--danger-color);
}

.text-primary {
    color: var(--primary-color);
}

.bg-light {
    background-color: var(--light-color);
}

.bg-white {
    background-color: white;
}

.bg-dark {
    background-color: var(--dark-color);
}

.text-white {
    color: white;
}

.shadow-sm {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.shadow {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.my-1 { margin-top: 0.5rem; margin-bottom: 0.5rem; }
.my-2 { margin-top: 1rem; margin-bottom: 1rem; }
.my-3 { margin-top: 1.5rem; margin-bottom: 1.5rem; }
.my-4 { margin-top: 2rem; margin-bottom: 2rem; }

.py-1 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-2 { padding-top: 1rem; padding-bottom: 1rem; }
.py-3 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-4 { padding-top: 2rem; padding-bottom: 2rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

.px-2 { padding-left: 1rem; padding-right: 1rem; }
.px-3 { padding-left: 1.5rem; padding-right: 1.5rem; }

.d-flex {
    display: flex;
}

.justify-content-center {
    justify-content: center;
}

.justify-content-between {
    justify-content: space-between;
}

.align-items-center {
    align-items: center;
}

.flex-wrap {
    flex-wrap: wrap;
}

.flex-column {
    flex-direction: column;
}

.w-100 {
    width: 100%;
}

.font-weight-bold {
    font-weight: 700;
}

.font-weight-normal {
    font-weight: 400;
}

/* Responsive */

@media (max-width: 768px) {
    .col-md-2 { flex: 0 0 100%; max-width: 100%; }
    .col-md-3 { flex: 0 0 100%; max-width: 100%; }
    .col-md-4 { flex: 0 0 100%; max-width: 100%; }
    .col-md-6 { flex: 0 0 100%; max-width: 100%; }
    .col-md-9 { flex: 0 0 100%; max-width: 100%; }
    
    .navbar-actions {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
    }
    
    .navbar-actions .btn {
        width: 100%;
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .table thead th,
    .table tbody td {
        padding: 0.75rem 0.5rem;
    }
    
    .card-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .col-lg-2 { flex: 0 0 100%; max-width: 100%; }
    .col-lg-3 { flex: 0 0 100%; max-width: 100%; }
    .col-lg-4 { flex: 0 0 100%; max-width: 100%; }
    .col-lg-6 { flex: 0 0 100%; max-width: 100%; }
    .col-lg-10 { flex: 0 0 100%; max-width: 100%; }
    
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
}