:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f1c40f;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --sidebar-width: 250px;
    --header-height: 60px;
    --transition-speed: 0.3s;
}

/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    position: relative;
    min-height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f8f9fa;
}

/* Layout */
.wrapper {
    display: flex;
    width: 100%;
    align-items: stretch;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    background: var(--primary-color);
    color: #fff;
    transition: all var(--transition-speed);
    position: fixed;
    height: 100vh;
    z-index: 1000;
}

.sidebar.active {
    margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar .sidebar-header {
    padding: 20px;
    background: var(--secondary-color);
}

.sidebar ul.components {
    padding: 20px 0;
}

.sidebar ul li a {
    padding: 10px 20px;
    font-size: 1.1em;
    display: block;
    color: #fff;
    text-decoration: none;
    transition: all var(--transition-speed);
}

.sidebar ul li a:hover {
    background: var(--secondary-color);
}

.sidebar ul li.active > a {
    background: var(--accent-color);
}

.sidebar ul li a i {
    margin-right: 10px;
}

/* Content */
#content {
    width: calc(100% - var(--sidebar-width));
    margin-left: var(--sidebar-width);
    transition: all var(--transition-speed);
    min-height: 100vh;
}

#content.active {
    width: 100%;
    margin-left: 0;
}

/* Navbar */
.navbar {
    padding: 15px 10px;
    background: #fff;
    border: none;
    border-radius: 0;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

/* Cards */
.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-speed);
}

.card:hover {
    transform: translateY(-2px);
}

/* Forms */
.form-control {
    border-radius: 4px;
    border: 1px solid #ddd;
    padding: 8px 12px;
}

.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* Buttons */
.btn {
    border-radius: 4px;
    padding: 8px 16px;
    transition: all var(--transition-speed);
}

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

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}

/* Tables */
.table {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
}

.table thead th {
    background: var(--light-color);
    border-bottom: 2px solid #dee2e6;
}

/* Validation */
.validation-summary-errors {
    color: var(--danger-color);
    background-color: #fde8e8;
    border: 1px solid #fbd5d5;
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.field-validation-error {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Footer */
.footer {
    background: #fff;
    padding: 1rem 0;
    position: relative;
    bottom: 0;
    width: 100%;
    border-top: 1px solid #dee2e6;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        margin-left: calc(-1 * var(--sidebar-width));
    }
    .sidebar.active {
        margin-left: 0;
    }
    #content {
        width: 100%;
        margin-left: 0;
    }
    #content.active {
        margin-left: var(--sidebar-width);
    }
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--accent-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1050;
}

.toast {
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 10px;
    min-width: 250px;
}

.toast-header {
    background: var(--light-color);
    border-bottom: 1px solid #dee2e6;
}

.toast-success {
    border-left: 4px solid var(--success-color);
}

.toast-error {
    border-left: 4px solid var(--danger-color);
}

.toast-warning {
    border-left: 4px solid var(--warning-color);
}

/* Enhanced Table Styles */
.table-container {
    margin: 20px 0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

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

.table thead th {
    background: var(--light-color);
    border-bottom: 2px solid #dee2e6;
    padding: 12px 15px;
    font-weight: 600;
    color: var(--dark-color);
}

.table tbody tr {
    transition: background-color 0.2s;
}

.table tbody tr:hover {
    background-color: rgba(52, 152, 219, 0.05);
}

.table td {
    padding: 12px 15px;
    vertical-align: middle;
    border-top: 1px solid #dee2e6;
}

/* Table Actions Buttons */
.table-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.table-actions .btn {
    margin: 0;
    padding: 6px 12px;
    font-size: 0.875rem;
}

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

.table-actions .btn-danger {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

.table-actions .btn-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
    color: #212529;
}

.table-actions .btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

/* Table status badges */
.status-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-align: center;
    min-width: 70px;
}

.status-badge-success {
    background-color: rgba(46, 204, 113, 0.15);
    color: var(--success-color);
}

.status-badge-danger {
    background-color: rgba(231, 76, 60, 0.15);
    color: var(--danger-color);
}

.status-badge-warning {
    background-color: rgba(241, 196, 15, 0.15);
    color: #d35400;
}

/* Nested tables */
.nested-table {
    margin: 10px 0;
    width: 100%;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid #eee;
}

.nested-table thead th {
    background-color: #f8f9fa;
    font-size: 0.9rem;
    padding: 8px 12px;
}

.nested-table td {
    padding: 8px 12px;
    font-size: 0.9rem;
}

/* Responsive tables */
@media (max-width: 768px) {
    .table-responsive {
        display: block;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table-actions {
        flex-direction: column;
        gap: 5px;
    }
    
    .table-actions .btn {
        width: 100%;
    }
}