:root {
    --color-primary: #002147; /* Azul marino */
    --color-secondary: #29b6f6; /* Azul claro/Cyan */
    --color-text-dark: #333; /* Texto oscuro para fondos claros */
    --color-text-light: #fff; /* Texto claro para fondos oscuros */
    --color-red-error: #a0100f; /* Color rojo para errores */
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Open Sans', sans-serif;
    background-color: var(--color-primary);
    color: var(--color-text-dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 1em;
    box-sizing: border-box;
}

.header-container {
    width: 100%;
    max-width: 900px;
    margin-bottom: 2em;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 1.5em;
    flex-wrap: wrap; 
}

/* --- ESTILOS DEL ENCABEZADO Y LOGO --- */
.logo {
    max-height: 110px;
    width: auto;
}

h1 {
    font-size: 1.5em; 
    color: var(--color-text-light);
    margin: 0;
}
/* ------------------------------------ */


.main-container {
    display: flex;
    flex-direction: column; 
    gap: 2em;
    width: 100%;
    max-width: 900px;
}

.calculator-row {
    display: flex; /* CLAVE: Habilita Flexbox */
    flex-direction: column; /* Por defecto: Columna (Móvil) */
    gap: 2em;
    width: 100%;
}


.form-card, .result-card {
    background-color: var(--color-text-light);
    color: var(--color-text-dark);
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    flex: 1; /* Valor por defecto para móvil */
    display: flex;
    flex-direction: column;
}


/* --- DISCLAIMER CARD (Estilos Móvil) --- */
.disclaimer-card {
    /* Eliminamos la regla width: 100% y dejamos que el flex-direction: column la haga full width */
    max-width: 250px; 
    background-color: #f0f8ff; 
    color: var(--color-text-dark);
    padding: 1.0em;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-top: 2em; 
    border-left: 5px solid var(--color-secondary); 
}
.disclaimer-card h3 { color: var(--color-primary); margin-top: 0; margin-bottom: 0.5em; }
.disclaimer-card p { font-size: 0.6em; line-height: 1.5; margin-bottom: 1em; }
.disclaimer-card ul { font-size: 0.9em; line-height: 1.5; padding-left: 1.5em; margin-top: 0; }
/* ------------------------------------ */


/* --- MEDIA QUERY (Escritorio) --- */
@media (min-width: 768px) {
    
    .calculator-row {
        flex-direction: row; /* CLAVE: Lo convierte en fila */
        min-height: 550px;
        align-items: flex-start; /* CLAVE: Alinea a la parte superior */
    }
    
    /* PROPORCIONES DE ESPACIO PARA LAS 3 TARJETAS */
    .disclaimer-card {
        flex: 1.2; 
        margin-top: 0; 
        max-width: none; /* CLAVE: Anula el max-width de móvil */
    }
    .form-card {
        flex: 2; /* El formulario es el más ancho */
    }
    .result-card {
        flex: 1.5; 
    }
    
    h1 {
        font-size: 2em; 
    }
    .logo {
        max-height: 110px; 
    }
}
/* --- FIN DE MEDIA QUERY --- */

/* --- ESTILOS GENÉRICOS DE FORMULARIO Y RESULTADOS (Sin cambios) --- */

.form-header { margin-bottom: 1.0em; }
.form-header h2 { color: var(--color-primary); margin: 0 0 0.5em; }
.form-mode { display: flex; gap: 1em; }
.form-mode label { cursor: pointer; }
.form-group { margin-bottom: 1.5em; position: relative; }
label { display: block; margin-bottom: .5em; color: var(--color-primary); }
input[type="text"], input[type="date"] {
    width: 100%; padding: 0.75em; box-sizing: border-box; border: 1px solid #ccc;
    background-color: #f9f9f9; color: var(--color-text-dark); border-radius: 4px;
    transition: border-color 0.3s;
}
input[type="text"]:focus, input[type="date"]:focus { outline: none; border-color: var(--color-secondary); }
input.error { border: 2px solid var(--color-red-error); }
.error-message {
    color: var(--color-red-error); font-size: 0.9em; margin-top: -1em;
    margin-bottom: 1em; text-align: center; font-weight: bold; min-height: 1.5em;
}

#calculate-btn {
    width: 100%; padding: 1em; border: none; background-color: #ff4500; 
    color: var(--color-text-light); font-size: 1.1em; font-weight: bold; 
    border-radius: 25px; cursor: pointer; transition: background-color 0.3s, transform 0.1s, box-shadow 0.3s;
    margin-top: auto; box-shadow: 0 6px 10px rgba(0, 0, 0, 0.3), 0 0 10px rgba(255, 69, 0, 0.5); 
}
#calculate-btn:hover { background-color: #ff6347; box-shadow: 0 8px 12px rgba(0, 0, 0, 0.4), 0 0 15px rgba(255, 69, 0, 0.7); }
#calculate-btn:active { transform: translateY(2px); box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); }

.result-card h3 { color: var(--color-primary); margin-top: 0; }
.result-row {
    display: flex; justify-content: space-between; align-items: baseline;
    padding: 0.4em 0; border-bottom: 1px dashed #ccc;
}
.result-row:last-child { border-bottom: none; }
.result-row strong { color: var(--color-primary); }
.result-value { font-size: 1.1em; font-weight: bold; color: var(--color-text-dark); }
.final-result { margin-top: auto; padding-top: 1em; }
.final-result .result-value { font-size: 1.5em; color: var(--color-secondary); }
.hidden { display: none !important; }

.loader-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 33, 71, 0.7); display: flex;
    justify-content: center; align-items: center; z-index: 1000;
}
.loader {
    border: 5px solid #f3f3f3; border-top: 5px solid var(--color-secondary);
    border-radius: 50%; width: 50px; height: 50px; animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* --- ESTILOS DE CONTACTO --- */
.small-note { font-size: 0.85em; color: #777; margin-top: 10px; margin-bottom: 0; }
.contact-card {
    background-color: #f9f9f9; border: 1px solid #ddd; border-radius: 8px;
    padding: 20px; text-align: center; width: 100%; box-sizing: border-box; 
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); 
}
.contact-card h3 { color: var(--color-primary); margin-top: 0; margin-bottom: 10px; font-size: 1.3em; }
.contact-card p { color: var(--color-text-dark); margin-bottom: 15px; font-size: 1em; }
.contact-info { display: flex; flex-direction: column; align-items: center; gap: 15px; }
.phone-link { color: #007bff; text-decoration: none; font-weight: bold; font-size: 1.2em; }
.whatsapp-btn {
    display: inline-block; background-color: #25D366; color: white; padding: 12px 24px;
    border-radius: 25px; text-decoration: none; font-weight: 600; font-size: 1.1em;
    transition: background-color 0.3s, transform 0.2s; border: none;
}
.whatsapp-btn:hover { background-color: #128C7E; transform: scale(1.05); }