.admin-header {
    background: #333;
    color: #fff;
    padding: 15px 20px;
}

.admin-nav {
    background: #f5f5f5;
    padding: 10px 0;
    border-bottom: 1px solid #ddd;
}

.admin-nav ul {
    display: flex;
    list-style: none;
}

.admin-nav li {
    margin-right: 20px;
}

.admin-nav a {
    padding: 8px 16px;
    display: block;
}

.admin-main {
    padding: 20px;
}

.todo-box {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.todo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #ffeeba;
}

.todo-item:last-child {
    border-bottom: none;
}

.badge {
    background: #dc3545;
    color: #fff;
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 12px;
}

.data-table {
    background: #fff;
    border: 1px solid #ddd;
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.data-table th {
    background: #f8f9fa;
}

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

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

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

.qrcode-display {
    text-align: center;
    padding: 40px;
}

.qrcode-display img {
    max-width: 300px;
    margin: 20px 0;
}

.login-box {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}