:root {
    --primary-blue: #007bff;
    --bg-gray: #f4f7f6;
    --text-dark: #333;
}

body {
    font-family: sans-serif;
    background: #f0f2f5;
    margin: 0;
}

input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    width: 100%;
    padding: 10px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:disabled {
    background: #ccc;
}

#message {
    margin-top: 10px;
    font-size: 0.9rem;
    text-align: center;
}

.error { color: red; }
.success { color: green; }

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

.alert-success { background-color: #d4edda; color: #155724; border-color: #28a745; }
.alert-error   { background-color: #f8d7da; color: #721c24; border-color: #f5c6cb; }
.alert-info    { background-color: #d1ecf1; color: #0c5460; border-color: #bee5eb; }

.main-container {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 20px;
    background-color: var(--bg-gray);
    text-align: center;
    min-width: 90%;
}

.dashboard-title {
    margin-bottom: 20px;
    color: var(--text-dark);
}

.back-link {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 15px;
    background-color: #6c757d;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.back-link:hover { background-color: #5a6268; }