/* --- Variables de Color y Tema --- */
:root {
    --bg-gradient-start: #f5f7fa;
    --bg-gradient-end: #c3cfe2;
    --bg-main: #ffffff;
    --text-primary: #1A202C;
    --text-secondary: #4A5568;
    --color-accent: #2C7A7B;
    --color-accent-hover: #285E61;
    --color-accent-light: #38B2AC;
    --border-color: #eee;
    --border-color-light: #B2F5EA;
    --results-bg: #E6FFFA;
    --input-border: #ccc;
    --input-focus-border: var(--color-accent);
    --input-focus-shadow: rgba(44, 122, 123, 0.2);
    --code-bg: #f4f4f4;
    --code-border: #ddd;
    --cta-box-bg: var(--results-bg);
    --cta-box-border: var(--color-accent-light);
    --tooltip-bg: #2D3748;
    --tooltip-text: white;
    --header-bg: #ffffff00;
}

[data-theme="dark"] {
    --bg-gradient-start: #2d3748;
    --bg-gradient-end: #1a202c;
    --bg-main: #2D3748;
    --text-primary: #E2E8F0;
    --text-secondary: #A0AEC0;
    /* Nuevos colores de acento para el modo oscuro con mejor contraste */
    --color-accent: #38B2AC; /* Teal más brillante */
    --color-accent-hover: #2C7A7B; /* El color de acento original, ahora para hover */
    --color-accent-light: #4FD1C5; /* Un teal aún más claro para degradados */

    --border-color: #4A5568;
    --border-color-light: #2C7A7B;
    --results-bg: #1A202C;
    --input-border: #4A5568;
    --input-focus-shadow: rgba(56, 178, 172, 0.3);
    --code-bg: #1A202C;
    --code-border: #4A5568;
    --cta-box-bg: #1A202C;
    --tooltip-bg: #E2E8F0;
    --tooltip-text: #1A202C;
    --header-bg: #2d3748e0;
}

body {
    font-family: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-secondary);
    margin: 0;
    padding: 20px;    
    transition: background-color 0.3s ease, color 0.3s ease;
}
main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: var(--bg-main);
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    transition: background-color 0.3s ease;
}
h1, h2, h3 {
    color: var(--text-primary);
    font-weight: 600;
}
h1 { 
    text-align: center; 
    font-size: 2.5em; /* Un poco más grande para que el efecto luzca */
    font-weight: 700;
    /* El detalle "copado": texto con degradado */
    background: linear-gradient(45deg, var(--color-accent), var(--color-accent-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
form div {
    margin-bottom: 15px;
}
label {
    display: inline-flex;
    margin-bottom: 5px;
    font-weight: 600;
    align-items: center; /* Alinea verticalmente el texto y el icono */
}
.label-wrapper {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
}


/* Tooltip Styles */
.tooltip-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    background-color: var(--text-secondary);
    color: white;
    border-radius: 50%;
    text-align: center;
    font-size: 12px;
    line-height: 16px;
    font-weight: bold;
    cursor: help;
    margin-left: 8px;
    position: relative; /* Contexto para el tooltip */
}

.tooltip-icon:hover::after {
    content: attr(data-tooltip); /* El texto del tooltip */
    position: absolute;
    bottom: 125%; /* Posición encima del icono */
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85em;
    font-weight: normal;
    width: 220px; /* Ancho fijo para mejor lectura */
    text-align: left;
    z-index: 10;
    line-height: 1.4;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}
input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    box-sizing: border-box; /* Importante para que el padding no rompa el ancho */
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--bg-main);
    color: var(--text-primary);
}
input[type="number"]:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}
button {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}
button:hover {
    background-color: var(--color-accent-hover);
}
#results {
    margin-top: 20px;
    padding: 20px;
    background-color: var(--results-bg);
    border-left: 5px solid var(--color-accent-light);
    border-radius: 4px;
}
#results h3 {
    font-size: 1em;
    color: var(--color-accent);
    margin-bottom: 5px;
}
#results p {
    font-size: 1.5em;
    font-weight: bold;
    margin: 0 0 15px 0;
    color: var(--text-primary);
}
.results-summary {
    display: flex;
    justify-content: space-around;
    text-align: center;
    margin-bottom: 20px;
}
.results-breakdown {
    border-top: 1px solid var(--border-color-light);
    padding-top: 15px;
}
.results-breakdown h4 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 15px;
    font-weight: 600;
    color: var(--color-accent);
}
.breakdown-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    font-size: 0.9em;
}
.breakdown-table th, .breakdown-table td {
    padding: 10px;
    text-align: right;
    border-bottom: 1px solid var(--border-color-light);
}
.breakdown-table th {
    color: var(--color-accent);
    font-weight: 600;
}
.breakdown-table td:first-child {
    text-align: left;
    font-weight: 600;
    color: #4A5568;
}

/* Formula Toggle Section */
.formula-toggle-container {
    text-align: center;
    margin-top: 25px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color-light);
}

.formula-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px; /* Espacio entre los dos enlaces */
}

.link-button, a.link-button {
    background: none;
    border: none;
    color: var(--color-accent);
    text-decoration: underline;
    cursor: pointer;
    padding: 0;
    font-size: 0.9em;
    font-weight: 600;
}
.link-button:hover {
    color: var(--color-accent-hover);
    background: none; /* Override general button hover */
}

.formula-box {
    margin-top: 15px;
}

.formula-box code {
    display: inline-block; /* Make it fit the content */
    text-align: center;
}

.hidden {
    display: none;
}
.content-section {
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* Clase para accesibilidad: Oculta visualmente pero mantiene accesible para lectores de pantalla */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Language Switcher Styles */
#lang-switcher {
    text-align: right;
    margin-bottom: 15px;
}

#lang-switcher button {
    display: inline-block;
    width: auto;
    padding: 5px 10px;
    margin-left: 5px;
    font-size: 14px;
    background-color: #e9ecef;
    color: #495057;
    border: 1px solid #ced4da;
    cursor: pointer;
    transition: background-color 0.2s ease;
}
#lang-switcher button:hover {
    background-color: #dbe1e6;
}

/* Currency Switcher inside the form */
.form-switcher {
    margin-bottom: 20px;
    text-align: center;
}

.form-switcher button {
    display: inline-block;
    width: auto;
    padding: 8px 15px;
    margin: 0 5px;
    font-size: 14px;
    background-color: #f8f9fa;
    color: #495057;
    border: 1px solid #dee2e6;
    border-radius: 20px; /* Rounded buttons */
}
.form-switcher button.active {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.cta-button {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--color-accent);
    color: white !important; /* Asegurar que el texto sea blanco */
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    margin-top: 10px;
    transition: background-color 0.3s ease;
}
.cta-button:hover {
    background-color: var(--color-accent-hover);
    color: white !important;
}

/* --- Estilos del Blog --- */
article.content-section {
    max-width: 720px; /* Más angosto para leer fácil */
    margin: 20px auto;
}

article h1 {
    font-size: 2.5em;
    line-height: 1.2;
}

article h2 {
    font-size: 2em;
    margin-top: 40px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

article h3 {
    font-size: 1.5em;
    margin-top: 30px;
}

/* --- Estilos Adicionales del Blog y Header --- */

/* Header Mejorado */
.site-header {
    background-color: var(--header-bg);
    backdrop-filter: blur(5px);
    border-bottom: 1px solid var(--border-color);
    border-bottom: 0px solid var(--border-color);
    padding: 10px 20px;
    margin-bottom: 20px; /* Espacio antes del contenido principal */
}
.site-header nav {
    max-width: 840px; /* 800px del main + 20px de padding a cada lado */
    margin: 0 auto; /* Corregido: Centra el nav horizontalmente */
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px; /* Mantiene el espaciado interno */
}
.nav-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}
.nav-brand a {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--text-primary);
    text-decoration: none;
}
.nav-lang a {
    font-weight: bold;
    text-decoration: none;
    padding: 5px;
    color: var(--text-secondary);
}
.nav-lang a.active {
    color: var(--color-accent); /* Usando el color principal del sitio */
    text-decoration: underline;
}

/* --- Theme Toggler Switch --- */
.theme-switcher {
    display: flex;
    align-items: center;
}
.theme-toggle-checkbox {
    display: none;
}
.theme-toggle-label {
    display: block;
    position: relative;
    width: 50px;
    height: 26px;
    background-color: #A0AEC0;
    border-radius: 13px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}
.theme-toggle-label::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
}
.theme-toggle-checkbox:checked + .theme-toggle-label {
    background-color: var(--color-accent);
}
.theme-toggle-checkbox:checked + .theme-toggle-label::after {
    transform: translateX(24px);
}


/* Estilo para las etiquetas CODE */
code {
    display: block;
    background-color: var(--code-bg);
    border: 1px solid var(--code-border);
    border-left: 4px solid var(--color-accent-light);
    border-radius: 4px;
    padding: 15px;
    margin: 15px 0;
    font-family: Consolas, "Courier New", monospace;
    font-size: 1em;
    white-space: pre-wrap; /* Para que el texto no se salga */
    word-wrap: break-word;
}

/* Estilo para la Tabla de Gastos */
.data-table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
    border: 1px solid var(--code-border);
}
.data-table th, 
.data-table td {
    border: 1px solid var(--code-border);
    padding: 12px;
    text-align: left;
}
.data-table th {
    background-color: var(--code-bg);
    font-weight: bold;
}

/* Estilo para el CTA Box (Caja de Llamada a la Acción) - Unificado */
.cta-box {
    background-color: var(--cta-box-bg);
    border: 1px solid var(--cta-box-border);
    border-radius: 8px;
    padding: 25px;
    margin: 30px 0;
    text-align: center;
}
.cta-box strong {
    font-size: 1.5em; /* Tu tamaño mejorado */
    color: var(--color-accent);
    display: block;
    margin-bottom: 10px;
}

/* --- Estilos para la lista de artículos del blog (páginas de índice) --- */
.blog-index ul {
    list-style-type: none;
    padding: 0;
}

.blog-index li {
    margin-bottom: 20px;
    border-radius: 8px;
    position: relative; /* Necesario para el borde izquierdo */
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    border: 1px solid var(--border-color); /* Borde sutil general */
    border-left: 4px solid var(--color-accent-light); /* Borde izquierdo de acento */
}

.blog-index li:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.07);
}

.blog-index li a {
    display: block;
    padding: 20px;
    text-decoration: none;
}

.blog-index li a .post-title {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--color-accent); /* ¡Hacemos que el título resalte! */
    margin: 0 0 5px 0;
}

.blog-index li a .post-description {
    font-size: 0.95em;
    margin: 0;
    color: var(--text-secondary); /* Usa el color de texto secundario para la descripción */
}

.explanation-box {
    margin-top: 20px;
    padding: 15px;
    background-color: var(--cta-box-bg);
    border-radius: 4px;
    border: 1px solid var(--cta-box-border);
    line-height: 1.5;
}

.explanation-box strong {
    color: var(--color-accent); /* Tu color de marca */
}