body {
    background: #f8f9fa;
    color: #212529;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    min-height: 100vh;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    background: #ffffff;
    padding: 30px;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
h1, h2, h3 {
    margin-top: 0;
    color: #343a40;
    font-weight: 600;
}
p {
    color: #6c757d;
    margin-top: 0;
    line-height: 1.5;
}
nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-bottom: 30px;
    padding: 12px 20px;
    border-radius: 6px;
    background-color: #e9ecef;
    border: 1px solid #ced4da;
}
nav div.nav-panel {
    display: contents;
}
nav a {
    color: #198754;
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
}
nav a:hover {
    background-color: #d1e7dd;
    color: #146c43;
}
.form-group {
    margin-bottom: 16px;
}
label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.95rem;
    color: #495057;
    font-weight: 500;
}
input[type="text"], input[type="password"], select, textarea {
    width: 100%;
    padding: 10px;
    background: #ffffff;
    border: 1px solid #ced4da;
    color: #212529;
    font-size: 0.95rem;
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}
input[type="text"]:focus, input[type="password"]:focus, select:focus, textarea:focus {
    border-color: #75b798;
    outline: none;
}
textarea {
    resize: vertical;
}
.btn {
    background: #198754;
    color: #ffffff;
    border: 1px solid #198754;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 4px;
    font-weight: 500;
    transition: background-color 0.2s;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}
.btn:hover {
    background: #157347;
    border-color: #146c43;
}
.status-msg {
    display: block;
    padding: 12px;
    margin-bottom: 16px;
    border-radius: 4px;
    text-align: center;
    font-size: 0.95rem;
}
.success {
    background: #d1e7dd;
    color: #0f5132;
    border: 1px solid #badbcc;
}
.error {
    background: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
}
.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 20px;
}
.info-card {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    padding: 20px;
    border-radius: 6px;
}
.gridview {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background: #fff;
}
.gridview th {
    padding: 12px;
    text-align: left;
    background-color: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
    color: #495057;
    font-weight: 600;
}
.gridview td {
    padding: 12px;
    border-bottom: 1px solid #dee2e6;
    color: #212529;
}
.gridview tr:hover {
    background-color: #f1f3f5;
}
.total-box {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
    font-size: 1.1rem;
    color: #212529;
}