/* ============================================================
   VARIABLES GLOBALES CSS3
   ------------------------------------------------------------
   - Custom Properties (CSS Variables) para tema
   - Añadidas variables de espaciado modernas
   ============================================================ */
:root {
    /* Colores corporativos */
    --color-primary: #0C4569;
    --color-white: #ffffff;
    --color-text: #333333;
    
    /* Sistema de espaciado moderno con clamp() */
    --spacing-xs: clamp(0.25rem, 1vw, 0.5rem);
    --spacing-sm: clamp(0.5rem, 2vw, 1rem);
    --spacing-md: clamp(1rem, 3vw, 1.5rem);
    --spacing-lg: clamp(1.5rem, 4vw, 2.5rem);
    --spacing-xl: clamp(2rem, 5vw, 3rem);
    
    /* Tamaños de fuente responsivos con clamp() */
    --font-size-base: clamp(14px, 4vw, 16px);
    --font-size-h2: clamp(1.2rem, 4vw, 1.4rem);
    --font-size-title: clamp(1.5rem, 5vw, 2rem);
    
    /* Transiciones suaves */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border radius consistente */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* ============================================================
   RESET MODERNO CSS3
   ------------------------------------------------------------
   - Box-sizing universal con herencia
   - Smooth scroll nativo
   ============================================================ */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth; /* CSS3: Scroll suave nativo */
}

/* ============================================================
   ESTILO BASE DEL BODY - CSS3 GRID LAYOUT
   ------------------------------------------------------------
   - Grid en lugar de flexbox para layout principal
   - Mejor control semántico de áreas
   ============================================================ */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    
    /* CSS3 Grid Layout para estructura principal */
    display: grid;
    grid-template-rows: auto 1fr auto; /* header, main, footer */
    grid-template-columns: 1fr;
    
    position: relative;
    overflow-x: hidden;
    width: 100%;
    color: var(--color-text);
    font-size: var(--font-size-base);
}

/* ============================================================
   CABECERA (HEADER) - CSS3 FLEXBOX CON GAP
   ------------------------------------------------------------
   - Uso de gap en lugar de margins
   - Propiedades lógicas para mejor internacionalización
   ============================================================ */
.header-container {
    background-color: var(--color-primary);
    padding-block: 10px; /* CSS3 Logical Property: padding-top y padding-bottom */
    padding-inline: 0;   /* CSS3 Logical Property: padding-left y padding-right */
    width: 100%;
    display: flex;
    position: relative;
    align-items: center;
    gap: 20px; /* CSS3: gap en lugar de margin-right */
}

/* Contenedor del logo dentro del header */
.logo-container {
    width: clamp(80px, 20vw, 130px); /* CSS3: Tamaño adaptativo automático */
    height: auto;
    flex-shrink: 0;
}

.logo-container img {
    max-width: 100%;
    height: auto;
    display: block;
    object-fit: contain; /* CSS3: Mejor control de la imagen */
}

/* ============================================================
   MENÚ DE NAVEGACIÓN - CSS3 FLEXBOX CON GAP
   ------------------------------------------------------------
   - Gap para espaciado entre elementos
   - Propiedades de transición optimizadas
   ============================================================ */
nav {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0; /* Los links tienen su propio padding */
}

nav a {
    color: var(--color-white);
    text-decoration: none;
    font-weight: bold;
    padding-block: 10px;  /* CSS3 Logical Properties */
    padding-inline: 15px;
    display: block;
    
    /* CSS3: Transición optimizada con will-change */
    transition: all var(--transition-normal);
    will-change: background-color, color, border-radius;
    border-radius: var(--radius-md);
}

nav a:hover,
nav a:focus {
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    outline: none; /* Quitamos outline por defecto */
}

/* CSS3: Focus visible para accesibilidad */
nav a:focus-visible {
    outline: 3px solid var(--color-white);
    outline-offset: 2px;
}

/* ============================================================
   TÍTULO PRINCIPAL DE LA PÁGINA
   ------------------------------------------------------------
   - Tamaño de fuente con clamp()
   - Espaciado lógico
   ============================================================ */
.titulo-centrado {
    color: var(--color-primary);
    text-align: center;
    font-size: var(--font-size-title); /* CSS3: clamp() automático */
    font-weight: bold;
    padding-block-start: 40px; /* CSS3 Logical Property: padding-top */
    padding-block-end: 20px;   /* CSS3 Logical Property: padding-bottom */
}

/* ============================================================
   CONTENIDO PRINCIPAL (<main>) - CSS3 GRID
   ------------------------------------------------------------
   - Grid para mejor control del contenido
   - Clamp para anchos adaptativos
   ============================================================ */
main {
    padding-block-start: 10px;
    padding-block-end: 30px;
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: min(1200px, 90vw); /* CSS3: min() para ancho adaptativo */
    margin-inline: auto; /* CSS3 Logical Property: centrado horizontal */
    
    /* CSS3: Grid opcional para contenido interno */
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

/* ============================================================
   COLUMNA DE TEXTO DE "SOBRE VOSOTROS"
   ------------------------------------------------------------
   - Clamp() para anchos y tamaños responsivos
   - Propiedades lógicas
   ============================================================ */
.text-content {
    max-width: min(900px, 100%); /* CSS3: min() en lugar de media query */
    margin-inline: auto; /* CSS3 Logical Property */
    margin-block-end: 2.5rem;
    padding-inline: var(--spacing-md); /* CSS3: padding lateral adaptativo */
    padding-block-end: 1.5rem;
    text-align: justify;
    line-height: 1.8;
    font-size: var(--font-size-base); /* CSS3: clamp() automático */
    color: var(--color-text);
}

/* ============================================================
   BLOQUES DE TEXTO (SECCIONES CON H2)
   ------------------------------------------------------------
   - Espaciado con variables CSS
   ============================================================ */
.bloque-texto {
    margin-block-end: var(--spacing-lg); /* CSS3 Logical Property */
}

/* Títulos h2 dentro de cada bloque de texto */
.bloque-texto h2 {
    margin-block-start: 1.5rem;
    margin-block-end: 0.7rem;
    font-size: var(--font-size-h2); /* CSS3: clamp() automático */
    font-weight: bold;
    color: var(--color-primary);
    text-align: start; /* CSS3 Logical Property: mejor que 'left' */
}

/* Párrafos dentro de los bloques de texto */
.bloque-texto p {
    margin-block-end: 1rem;
    text-align: justify;
}

/* ============================================================
   LISTA ESPECÍFICA DE "QUÉ PUEDE APORTARTE LA TERAPIA"
   ------------------------------------------------------------
   - Espaciado lógico adaptativo
   - Gap para items de lista (experimental)
   ============================================================ */
.lista-terapia {
    margin-block-start: 0.5rem;
    margin-block-end: 1.5rem;
    margin-inline-start: clamp(2rem, 5vw, 2.5rem); /* CSS3: sangrado adaptativo */
    padding-inline-start: 0;
    list-style: disc;
    
    /* CSS3: Gap entre items de lista (experimental pero útil) */
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.lista-terapia li {
    text-align: justify;
    padding-inline-start: 0.3rem; /* CSS3 Logical Property */
}

/* ============================================================
   ENLACE DE "PEDIR CITA" DENTRO DEL TEXTO
   ------------------------------------------------------------
   - Transiciones suaves CSS3
   ============================================================ */
.enlace-cita {
    font-weight: bold;
    color: var(--color-primary);
    text-decoration: underline;
    transition: text-decoration var(--transition-fast);
}

.enlace-cita:hover,
.enlace-cita:focus {
    text-decoration: none;
}

/* ============================================================
   IMÁGENES (CARRUSEL / FOTOS ALEATORIAS) - CSS3 AVANZADO
   ------------------------------------------------------------
   - Aspect-ratio para proporciones estables
   - Object-fit para mejor control de imagen
   - Animaciones con GPU acceleration
   ============================================================ */

/* Contenedor general de la imagen dentro de la columna */
.image-container {
    width: 100%;
    margin-block: 30px; /* CSS3 Logical Property */
    margin-inline: auto;
    display: grid; /* CSS3: Grid en lugar de flex */
    place-items: center; /* CSS3: Centra horizontal y vertical en una línea */
    text-align: center;
}

/* Caja que limita el ancho de la imagen dentro de la columna */
.image-box {
    max-width: min(70%, 800px); /* CSS3: min() con límite máximo */
    width: 100%;
    aspect-ratio: 4 / 3; /* CSS3: Ratio fijo para evitar CLS */
    display: grid;
    place-items: center;
}

/* Imagen del carrusel (hombre / mujer)
   - CSS3: Animaciones con aceleración GPU
   - Transform en lugar de opacity para mejor performance
*/
.carousel-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain; /* CSS3: Mejor que cover para este caso */
    border-radius: var(--radius-md);
    
    /* CSS3: Animación de fade optimizada con GPU */
    opacity: 0;
    transform: translateZ(0); /* CSS3: Activa aceleración GPU */
    transition: opacity 3s ease-in-out;
    will-change: opacity; /* CSS3: Optimización de rendering */
}

/* Cuando el JS añade .visible, la imagen se muestra con fade-in */
.carousel-image.visible {
    opacity: 1;
}

/* === EFECTO CARBONCILLO → COLOR (CSS3 FILTERS) ===============
   - CSS3: Filtros avanzados con animación
   - GPU acceleration activada
   ============================================================ */
.carousel-image.carboncillo-anim {
    animation: carboncilloAColor 5.4s ease-out forwards;
    transform: translateZ(0); /* CSS3: GPU acceleration */
}

/* CSS3: Animación de filtros avanzados - MEJORADA CON KEYFRAMES SUAVES */
@keyframes carboncilloAColor {
    0% {
        filter: 
            grayscale(100%)
            contrast(230%)
            brightness(115%)
            saturate(0%);
    }
    
    20% {
        filter: 
            grayscale(85%)
            contrast(210%)
            brightness(113%)
            saturate(15%);
    }
    
    40% {
        filter: 
            grayscale(60%)
            contrast(170%)
            brightness(108%)
            saturate(45%);
    }
    
    65% {
        filter: 
            grayscale(20%)
            contrast(120%)
            brightness(103%)
            saturate(80%);
    }
    
    100% {
        filter: none;
    }
}

/* CSS3: Spinner de carga moderno con conic-gradient (opcional) */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #ccc;
    border-top-color: var(--color-primary);
    border-radius: 50%;
    margin-inline: auto; /* CSS3 Logical Property */
    animation: spin 0.8s linear infinite;
    transform: translateZ(0); /* CSS3: GPU acceleration */
}

/* CSS3: Animación optimizada con GPU */
@keyframes spin {
    to { 
        transform: rotate(360deg) translateZ(0);
    }
}

/* ============================================================
   FOOTER - CSS3 GRID AREA
   ============================================================ */
footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding-block: 10px; /* CSS3 Logical Property */
    width: 100%;
    text-align: center;
    
    /* CSS3: Grid para contenido del footer si crece */
    display: grid;
    place-items: center;
}

/* ============================================================
   MEDIA QUERIES CSS3 - CONTAINER QUERIES READY
   ------------------------------------------------------------
   - Queries modernas con rangos
   - Preparado para @container (futuro)
   ============================================================ */

/* CSS3: Range syntax moderna (≤ 991px) */
@media (max-width: 991px) {
    .header-container {
        flex-direction: column;
        padding-block: 10px;
        padding-inline: 20px;
        gap: 10px; /* CSS3: gap en lugar de margins */
    }
    
    .logo-container {
        margin-inline: auto;
    }
    
    nav {
        width: 100%;
    }
    
    nav a {
        font-size: clamp(13px, 3vw, 14px);
    }
}

/* CSS3: Tablets y móviles (≤ 768px) */
@media (max-width: 768px) {
    .text-content {
        max-width: 100%;
        margin-inline: auto;
        margin-block-end: 2rem;
        padding-inline: var(--spacing-sm);
        padding-block-end: 1.25rem;
    }
    
    .image-box {
        max-width: 100%;
        aspect-ratio: auto; /* CSS3: Permite altura natural en móvil */
        min-height: 250px; /* FIX: Evita colapso sin perder flexibilidad */
    }
    
    nav a {
        font-size: clamp(12px, 3vw, 14px);
        padding-block: 8px;
        padding-inline: 10px;
    }
}

/* CSS3: Móviles pequeños (≤ 480px) */
@media (max-width: 480px) {
    .text-content {
        margin-block-end: 1.8rem;
        padding-inline: var(--spacing-xs);
        padding-block-end: 1rem;
    }
    
    nav a {
        font-size: clamp(11px, 3vw, 14px);
        padding-block: 8px;
        padding-inline: 10px;
    }
    
    .logo-container {
        width: clamp(60px, 15vw, 100px);
    }
}

/* CSS3: Landscape en móviles (altura baja) */
@media (max-height: 480px) and (orientation: landscape) {
    .header-container {
        padding-block: 5px;
        padding-inline: 10px;
    }
    
    .logo-container {
        width: clamp(50px, 12vw, 80px);
    }
    
    nav a {
        padding-block: 5px;
        padding-inline: 8px;
    }
}

/* ============================================================
   CSS3: PREFERS-REDUCED-MOTION (ACCESIBILIDAD)
   ------------------------------------------------------------
   - Respeta la preferencia del usuario de reducir animaciones
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================================
   OPTIMIZACIONES CSS3 DE RENDIMIENTO
   ------------------------------------------------------------
   - Content-visibility para lazy rendering
   - Contain para aislamiento de rendering
   ============================================================ */

/* CSS3: Optimización de rendering para bloques largos */
.bloque-texto {
    content-visibility: auto; /* CSS3: Lazy rendering automático */
    contain-intrinsic-size: 0 500px; /* CSS3: Tamaño estimado */
}

/* CSS3: Imágenes responsivas optimizadas */
img {
    height: auto;
    max-width: 100%;
    display: block;
    
    /* CSS3: Optimizaciones de carga */
    content-visibility: auto;
    loading: lazy; /* HTML5 pero afecta CSS */
}

/* Contenedores mínimos para evitar colapsos */
.container,
.content,
main,
article {
    min-height: 1px;
    contain: layout; /* CSS3: Aislamiento de layout */
}

/* Formularios estables con CSS3 */
input,
textarea,
select,
button {
    box-sizing: border-box;
    font-family: inherit; /* CSS3: Hereda fuente del body */
    font-size: inherit;
}

/* CSS3: Clearfix moderno con flow-root */
.clearfix {
    display: flow-root; /* CSS3: Reemplaza el hack del ::after */
}

/* Fallback para navegadores antiguos */
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* ============================================================
   CSS3: VARIABLES DE TEMA OSCURO (PREPARADO PARA FUTURO)
   ------------------------------------------------------------
   - Preparado para prefers-color-scheme
   ============================================================ */
@media (prefers-color-scheme: dark) {
    /* Descomentarconsevar si quieres activar tema oscuro */
    /*
    :root {
        --color-primary: #1a73a8;
        --color-white: #1a1a1a;
        --color-text: #e0e0e0;
    }
    */
}

/* ============================================================
   CSS3: PRINT STYLES (ESTILOS DE IMPRESIÓN)
   ------------------------------------------------------------
   - Optimización para imprimir la página
   ============================================================ */
@media print {
    /* Ocultar elementos no necesarios en impresión */
    nav,
    footer,
    .loading-spinner {
        display: none;
    }
    
    /* Optimizar colores para impresión */
    body {
        color: black;
        background: white;
    }
    
    /* Evitar saltos de página dentro de elementos */
    .bloque-texto,
    .text-content p {
        page-break-inside: avoid;
    }
    
    /* CSS3: Eliminamos sombras y efectos en impresión */
    * {
        box-shadow: none !important;
        text-shadow: none !important;
    }
}

/* ============================================================
   FIN DEL CSS3 OPTIMIZADO
   ============================================================ */

/* ============================================================
   FOOTER LEGAL - AÑADIDO
   ============================================================ */

.footer-legal-bar {
    background-color: rgba(0, 0, 0, 0.15);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: clamp(8px, 2vw, 12px) 20px;
}

.footer-legal-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-copy-text {
    color: rgba(255, 255, 255, 0.8);
    font-size: clamp(0.7rem, 1.8vw, 0.85rem);
    font-weight: normal;
}

.footer-legal-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-legal-links a {
    color: #ffffff;
    font-size: clamp(0.7rem, 1.8vw, 0.85rem);
    text-decoration: none;
    transition: opacity 0.3s ease;
    white-space: nowrap;
    font-weight: 500;
}

.footer-legal-links a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.footer-legal-links .separator {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
    .footer-legal-bar {
        padding: 10px 15px;
    }
    
    .footer-legal-content {
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }
    
    .footer-legal-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .footer-legal-bar {
        padding: 8px 10px;
    }
    
    .footer-copy-text {
        font-size: 0.7rem;
        width: 100%;
        text-align: center;
    }
    
    .footer-legal-links {
        width: 100%;
        justify-content: center;
        gap: 6px;
    }
    
    .footer-legal-links a {
        font-size: 0.7rem;
        padding: 2px 0;
    }
    
    .footer-legal-links .separator {
        font-size: 0.7rem;
    }
}

@media (max-width: 380px) {
    .footer-legal-links a {
        font-size: 0.65rem;
    }
    
    .footer-legal-links .separator {
        font-size: 0.65rem;
        margin: 0 2px;
    }
    
    .footer-legal-links {
        gap: 4px;
    }
}