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

body {
    background: #f5f5f5;
    font-family: 'Open Sans', Arial, sans-serif;
    color: #333;
    line-height: 1.6;
    font-size: 16px;
}

.navbar {
    background: #fff;
    border: none;
    border-bottom: 1px solid #ddd;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.navbar-brand {
    font-size: 24px;
    font-weight: 600;
    color: #333 !important;
    padding: 15px 0 0 15px;
}

.nav > li > a {
    color: #555 !important;
    font-size: 16px;
    padding: 15px 15px 10px 15px;
    background: transparent !important;
    border-bottom: 2px solid transparent;
}

.nav > li > a:hover {
    border-bottom-color: #007bff;
    color: #007bff !important;
}

.container {
    max-width: 1200px;
}

.main-content {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

h1, h2, h3, h4 {
    font-weight: 600;
    color: #222;
    margin-bottom: 20px;
}

h1 {
    font-size: 32px;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

.card {
    background: #fff;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    transition: all 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.card:hover {
    border-color: #007bff;
    box-shadow: 0 4px 8px rgba(0,123,255,0.1);
}

.btn {
    border-radius: 4px;
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    display: inline-block;
    text-decoration: none;
}

.btn-default {
    background: #f8f9fa;
    border-color: #ddd;
    color: #333;
}

.btn-default:hover {
    background: #e9ecef;
    border-color: #ccc;
}

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

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

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

.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.form-control:focus {
    border-color: #007bff;
    outline: none;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}

.alert {
    padding: 12px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-danger {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-warning {
    background: #fff3cd;
    border: 1px solid #ffeeba;
    color: #856404;
}

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

.text-muted {
    color: #6c757d;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.table th,
.table td {
    padding: 10px;
    border-bottom: 1px solid #eee;
    text-align: left;
}

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

.hero {
    background: #f8f9fa;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 40px 30px;
    margin-bottom: 30px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 20px;
}

.hero .description {
    font-size: 18px;
    color: #555;
    max-width: 800px;
    margin: 0 auto 20px auto;
    line-height: 1.6;
}