:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6b8cae;
    --background: #f5f7fa;
    --text-color: #333;
    --border-color: #ddd;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.password-generator {
    width: 90%;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 2rem;
}

.password-display {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

#password {
    flex: 1;
    padding: 0.75rem;
    font-size: 1.1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    text-align: center;
    font-family: monospace;
}

button {
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--secondary-color);
}

#copy-btn {
    font-size: 1.2rem;
    padding: 0 1rem;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

input[type="range"] {
    width: 100%;
    margin-top: 0.5rem;
}

#custom-chars {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    margin-top: 0.5rem;
}

#save-prefs {
    margin-top: 1rem;
    background-color: #4caf50;
}

#save-prefs:hover {
    background-color: #45a049;
}

.warning-message {
    white-space: pre-line; 
    word-break: break-word;
    color: #e74c3c;
    font-size: 0.9rem;
    margin: 0.5rem 0;
    padding: 0.5rem;
    border-radius: 5px;
    background-color: rgba(231, 76, 60, 0.1);
    display: none;
}

.warning-message.show {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (max-width: 600px) {
    .password-generator {
        padding: 1rem;
        margin: 1rem;
    }
    
    .password-display {
        flex-direction: column;
    }
}