html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f8f9fa;
}

.page {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 220px;
    background-color: #1b2a4a;
    color: #fff;
    padding: 1rem;
    flex-shrink: 0;
}

.sidebar a {
    color: #c8d6e5;
    text-decoration: none;
    display: block;
    padding: 0.5rem 0;
}

.sidebar a:hover,
.sidebar a.active {
    color: #fff;
}

.main {
    flex-grow: 1;
    padding: 2rem;
}

h1 {
    color: #1b2a4a;
    margin-top: 0;
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

select, textarea, input[type="text"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
    box-sizing: border-box;
}

textarea {
    min-height: 200px;
    resize: vertical;
}

button {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
}

button.primary {
    background-color: #2d6cdf;
    color: #fff;
}

button.primary:hover {
    background-color: #1a5bc4;
}

button.secondary {
    background-color: #6c757d;
    color: #fff;
}

.result-valid {
    background-color: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #c3e6cb;
    margin-top: 1rem;
}

.result-invalid {
    background-color: #f8d7da;
    color: #721c24;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #f5c6cb;
    margin-top: 1rem;
}

.key-display {
    background-color: #f4f4f4;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1rem;
    font-family: monospace;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-break: break-all;
    margin-top: 0.5rem;
}

.error-message {
    color: #dc3545;
    margin-top: 0.5rem;
}

.actions {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
}

.privacy-note {
    background-color: #d1ecf1;
    color: #0c5460;
    padding: 0.75rem;
    border-radius: 4px;
    border: 1px solid #bee5eb;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}