body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    text-align: center;
    margin: 30px 0;
}

h1 {
    color: #333;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 20px;
}

.form-container {
    width: 100%;
    max-width: 700px;
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px;
    border: 1px solid #ccc;
    border-radius: 10px;
    font-size: 1.05em;
}

.btn-submit {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 16px 0;
    font-size: 1.2em;
    cursor: pointer;
    border-radius: 10px;
    width: 100%;
    transition: background-color 0.3s;
}

.btn-submit:hover {
    background-color: #218838;
}

.btn-stock {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 16px 32px;
    font-size: 1.2em;
    cursor: pointer;
    border-radius: 10px;
    transition: background-color 0.3s;
}

.btn-stock:hover {
    background-color: #0069d9;
}

#respuesta {
    margin-top: 20px;
    text-align: center;
    font-weight: bold;
    color: #333;
}