:root {
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #212529;
    --border-color: #dee2e6;
    --error-color: #dc3545;
    --success-color: #198754;
}

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

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

/* Utilities */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    transition: background-color 0.2s;
}

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

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

.btn-block {
    display: block;
    width: 100%;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.alert {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
}

.alert-error {
    background-color: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
}

.alert-success {
    background-color: #d1e7dd;
    color: #0f5132;
    border: 1px solid #badbcc;
}

/* Login Page */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.login-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h2 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

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

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
}


/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #343a40;
    color: white;
    display: flex;
    flex-direction: column;
}

.sidebar .brand {
    padding: 1.5rem;
    font-size: 1.25rem;
    border-bottom: 1px solid #495057;
}

.sidebar ul {
    list-style: none;
    padding: 1rem 0;
    flex-grow: 1;
}

.sidebar li a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: #adb5bd;
    text-decoration: none;
    transition: color 0.2s, background-color 0.2s;
}

.sidebar li a:hover {
    color: white;
    background-color: #495057;
}

.sidebar .section-title {
    padding: 0.75rem 1.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: #6c757d;
    font-weight: bold;
    margin-top: 1rem;
}

.sidebar .bottom-link {
    margin-top: auto;
}

.main-content {
    flex-grow: 1;
    background-color: #f8f9fa;
    display: flex;
    flex-direction: column;
}

.top-bar {
    background-color: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: flex-end;
}

.content-wrapper {
    padding: 2rem;
    flex-grow: 1;
}

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.card h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Tables & Lists */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge-role {
    background-color: #e9ecef;
    color: #495057;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: white;
}

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

.btn-secondary:hover {
    background-color: #5a6268;
}