:root {
    --secondary-color: #E63946;
    --accent-color: #6A8542;
    --background-color: #E8F5E9;
    --text-color: #333;
    --input-focus-border: #388E3C;
    --input-placeholder-color: #A5D6A7;
    --button-hover-color: #fff;
    --button-hover-bg: var(--secondary-color);
    --button-shadow: rgba(0, 0, 0, 0.2);
    --header-gradient: linear-gradient(135deg, #43A047, #66BB6A);
    --hero-overlay-color: rgba(21, 182, 67, 0.4);
    --font-family: "Poppins", sans-serif;
    --modal-background: #ffebee;
    --modal-border: #ef9a9a;
    --modal-text-color: #c62828;
    --modal-shadow: rgba(0, 0, 0, 0.1);
}

* {
    font-family: "Poppins", sans-serif;
    font-weight: 400;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #E8F5E9, #C8E6C9);
    text-align: center;
}

h1 {
    font-size: 3.8em;
    color: #1B5E20;
    margin-bottom: 35px;
    text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
    font-weight: bold;
    text-align: center;
    letter-spacing: 1px;
}

.contenedor {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 30px;
    padding: 40px;
}

.card {
    background: linear-gradient(135deg, #ffffff, #E0F2F1);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 8px 20px var(--button-shadow);
    text-align: center;
    max-width: 300px;
    min-width: 300px;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
    border: 4px solid #1976D2;
}

.card:hover {
    transform: scale(1.1);
    box-shadow: 0 12px 25px var(--button-shadow);
    background: linear-gradient(135deg, #A5D6A7, #81C784);
    color: white;
}

.icono {
    width: 150px;
    height: 150px;
    margin-bottom: 15px;
}

h2 {
    font-size: 1.8em;
    margin-bottom: 10px;
}

select {
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    border: 2px solid var(--input-focus-border);
    border-radius: 10px;
    background-color: #fff;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

select:hover {
    border-color: var(--primary-color);
}

.seccion-superficie {
    margin-top: 40px;
    padding: 30px;
    background: linear-gradient(135deg, #ffffff, #E8F5E9);
    border-radius: 15px;
    box-shadow: 0 8px 15px var(--button-shadow);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    border: 4px solid #1976D2;
}

label {
    font-size: 1.4em;
    font-weight: bold;
    color: var(--text-color);
    display: block;
    margin-bottom: 10px;
}

input {
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    border: 2px solid var(--input-focus-border);
    border-radius: 10px;
    text-align: center;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:hover {
    border-color: var(--primary-color);
}

button {
    padding: 20px 50px;
    font-size: 1.5em;
    border-radius: 15px;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0 8px 15px var(--button-shadow);
    cursor: pointer;
    background: linear-gradient(135deg, #43A047, #66BB6A);
    color: white;
    border: none;
    margin-top: 3rem;
    margin-bottom: 3rem;
}

button:hover {
    background: linear-gradient(135deg, #388E3C, #43A047);
}

button:active {
    transform: scale(1);
    box-shadow: 0 4px 10px var(--button-shadow);
}

#productorInput {
    width: 30%;
}