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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f5f5f5;
    line-height: 1.6;
}

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

header {
    background: white;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

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

nav a {
    color: #007bff;
    text-decoration: none;
    margin-left: 20px;
}

nav a:hover {
    text-decoration: underline;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #6c757d;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.btn-primary {
    background: #007bff;
}

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

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-danger {
    background: #dc3545;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
}

.error {
    background: #fee;
    color: #c33;
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

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

table th {
    background: #f8f9fa;
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 12px;
    border-top: 1px solid #eee;
}

table tr:hover {
    background: #f8f9fa;
}