:root {
    --primary-color: #0066cc;
    --secondary-color: #004499;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --sidebar-width: 250px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transition: transform 0.3s ease;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar .sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.sidebar .sidebar-header h4 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.sidebar .sidebar-menu {
    padding: 1rem 0;
}

.sidebar .sidebar-menu .menu-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.sidebar .sidebar-menu .menu-item:hover,
.sidebar .sidebar-menu .menu-item.active {
    background-color: rgba(255, 255, 255, 0.1);
    padding-left: 2rem;
}

.sidebar .sidebar-menu .menu-item i {
    margin-right: 0.75rem;
    width: 20px;
}

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

.main-content.expanded {
    margin-left: 0;
}

.navbar-custom {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 1.5rem;
    position: relative;
    z-index: 900;
}

.navbar-custom .dropdown-menu {
    z-index: 901;
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 10px 10px 0 0 !important;
    padding: 1rem 1.5rem;
}

.btn {
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-1px);
}

.form-control {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    padding: 0.75rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

.table {
    border-radius: 8px;
    overflow: hidden;
}

.table thead th {
    background-color: var(--primary-color);
    color: white;
    border: none;
    font-weight: 600;
    padding: 1rem;
}

.table tbody tr {
    transition: background-color 0.3s ease;
}

.table tbody tr:hover {
    background-color: rgba(0, 102, 204, 0.05);
}

.stats-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
}

.stats-card h3 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stats-card p {
    margin: 0;
    opacity: 0.9;
}
.stats-card-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.stats-card-link:focus-visible .stats-card {
    outline: 3px solid rgba(255, 255, 255, 0.7);
    outline-offset: 2px;
}

.stats-card-link .stats-card {
    cursor: pointer;
}

.alert {
    border: none;
    border-radius: 8px;
    font-weight: 500;
}

.modal-content {
    border: none;
    border-radius: 15px;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 15px 15px 0 0;
}

.breadcrumb {
    background: none;
    padding: 0;
    margin-bottom: 1.5rem;
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--primary-color);
}

.badge {
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: 20px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .navbar-custom {
        padding: 0.5rem 1rem;
    }
}

.loading {
    display: none;
}

.loading.show {
    display: block;
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}