/* --- Variables de Color y Tipografía --- */
:root { 
    --green: #006400; 
    --green-dark: #004d00;
    --light: #f8f9fa; 
    --white: #fff; 
    --gray: #dee2e6; 
    --gray-dark: #6c757d;
    --text-dark: #212529;
    --font-main: 'Roboto', Arial, sans-serif;
}

/* --- Reseteo Básico --- */
* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

/* --- Estilos Generales del Body --- */
body { 
    font-family: var(--font-main); 
    background: var(--light); 
    color: var(--text-dark); 
    padding: 10px; /* CORRECCIÓN para Mobile */
    line-height: 1.5;
}

/* --- Encabezado --- */
.header { 
    text-align: center; 
    background: var(--white); 
    padding: 20px; 
    border-radius: 8px; 
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    margin-bottom: 30px; 
    border-bottom: 1px solid var(--gray);
}
.logo { 
    max-width: 170px;
}
h1 { 
    color: var(--green); 
    margin-top: 10px; 
    font-weight: 700;
    font-size: 2rem;
}

/* --- Contenedor Principal --- */
.calculator-container { 
    display: flex; 
    flex-direction: column; 
    gap: 20px; 
    max-width: 1000px; 
    margin: 0 auto; 
}

/* --- Tarjetas de Variedades --- */
.variety-card { 
    background: var(--white); 
    padding: 25px;
    border-radius: 8px; 
    border-top: 5px solid var(--green);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
h2 { 
    color: var(--green); 
    margin-bottom: 20px; 
    font-weight: 500;
    font-size: 1.5rem;
    border-bottom: 1px solid var(--gray);
    padding-bottom: 10px;
}

/* --- Inputs y Selects Mejorados --- */
select,
.calc-input {
    width: 100%; 
    padding: 12px; 
    margin: 8px 0 12px; 
    border: 1px solid var(--gray); 
    border-radius: 6px; 
    font-size: 1rem;
    font-family: var(--font-main);
    background-color: #fdfdfd;
    transition: border-color 0.2s, box-shadow 0.2s;
}

/* Aseguramos que input[type="text"] y [type="number"] se vean igual */
.calc-input {
    -moz-appearance: textfield; /* Quita flechas en Firefox */
}
.calc-input::-webkit-inner-spin-button,
.calc-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
/* Efecto de foco */
select:focus, 
input[type="number"].calc-input:focus {
    outline: none;
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(0, 100, 0, 0.1);
}

/* --- Grupos de Resultados (Costo/ha) --- */
.results-group { 
    margin-top: 15px; 
    padding-top: 15px; 
    border-top: 1px dashed var(--gray); 
    display: flex; 
    justify-content: space-between; 
    font-weight: 500;
    font-size: 1.1rem;
}
.result-value { 
    color: var(--green); 
    font-weight: 700;
}

/* --- Contenedor de Resumen y Ahorro --- */
.savings-container { 
    background: var(--white); 
    padding: 25px; 
    border-radius: 8px; 
    text-align: left;
    max-width: 600px; 
    margin: 30px auto; 
    border-top: 5px solid var(--green);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.savings-container h2 {
    text-align: center;
}
.result-item { 
    margin: 15px 0; 
    display: flex; 
    justify-content: space-between;
    font-size: 1.1rem;
}
.total-savings {
    padding-top: 15px;
    border-top: 1px solid var(--gray);
}
.total-savings span { 
    font-size: 1.8rem; 
    color: var(--green); 
    font-weight: 700;
}

/* --- Botón Principal --- */
.btn-download { 
    background: var(--green); 
    color: white; 
    border: none; 
    padding: 14px 32px; 
    font-size: 1.1rem; 
    font-weight: 500;
    border-radius: 6px; 
    cursor: pointer; 
    margin-top: 20px;
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.btn-download:hover { 
    background: var(--green-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 77, 0, 0.2);
}

/* ======== ESTILOS HERO y FOOTER ======== */

/* --- Hero Section --- */
.hero-section {
    text-align: center;
    margin-bottom: 30px;
}
.hero-section img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

/* --- Texto Introductorio --- */
.intro-text {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-dark);
    max-width: 600px;
    margin: 0 auto 30px auto;
}

/* --- Footer --- */
.footer {
    text-align: center;
    max-width: 1000px;
    margin: 40px auto 0 auto;
    padding: 30px 20px;
    border-top: 1px solid var(--gray);
}
.footer p {
    font-size: 1rem;
    color: var(--gray-dark);
    margin-bottom: 15px;
}
.footer-logo {
    max-width: 150px;
    transition: opacity 0.2s;
}
.footer a:hover .footer-logo {
    opacity: 0.8;
}

/* --- Media Query para Escritorio (768px+) --- */
@media (min-width: 768px) { 
    body {
        padding: 20px; /* Restaura el padding grande en desktop */
    }
    .calculator-container { 
        flex-direction: row; 
    } 
    .variety-card { 
        flex: 1; 
        margin: 0 10px; 
    } 
}