body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

header {
    background: #2c3e50;
    color: white;
    padding: 1rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav h1 {
    margin: 0;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1rem;
    margin: 0;
    padding: 0;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background 0.3s;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.1);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

footer {
    background: #34495e;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

h2 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

ul {
    margin: 1rem 0;
}

li {
    margin: 0.5rem 0;
}

/* Card styles */
.card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Button styles */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #007bff;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
}

.btn:hover {
    background: #0056b3;
}

.btn-success {
    background: #28a745;
}

.btn-success:hover {
    background: #1e7e34;
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-warning:hover {
    background: #e0a800;
}

.btn-danger {
    background: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
}

/* Form styles */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    box-sizing: border-box;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
}

/* Table styles */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

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

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

/* Utility classes */
.text-center {
    text-align: center;
}

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

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }

/* Alert styles */
.alert {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 4px;
}

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

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

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

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