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

body {
    background-color: #121212;
    color: #f0f0f0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
}

.quick-top-nav {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 2000;
}

.back-home-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 12px;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 8px 14px rgba(0, 0, 0, 0.25);
}

.back-home-black {
    color: #070707;
    font-size: 19px;
}

.back-home-neon {
    color: #ff2442;
    font-size: 20px;
    text-shadow:
        0 0 5px rgba(255, 36, 66, 0.95),
        0 0 11px rgba(255, 36, 66, 0.8),
        0 0 21px rgba(255, 36, 66, 0.5);
}

/* Bloquea el scroll cuando hay una imagen expandida */
body.obra-abierta {
    overflow: hidden;
}

header {
    text-align: center;
    padding: 40px 20px;
}

header h1 {
    font-size: 3rem;
    letter-spacing: 2px;
    margin-bottom: 10px;
    text-transform: uppercase;
}

header p {
    color: #888;
    font-style: italic;
}

.galeria {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-flow: dense;
    gap: 20px;
    width: 90%;
    max-width: 1200px;
    padding-bottom: 50px;
    align-items: start; /* ¡Clave! Permite que cada imagen defina su propia altura */
}

.obra {
    position: relative;
    border-radius: 12px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0,0,0,0.5);
    height: auto; /* Se adapta a la proporción original */
    
    /* Variables para el efecto 3D inicializadas a 0 */
    --rot-x: 0deg;
    --rot-y: 0deg;
    --scale: 1;
    
    /* Animación fluida para volver a su lugar y para el 3D */
    transform: perspective(1000px) rotateX(var(--rot-x)) rotateY(var(--rot-y)) scale3d(var(--scale), var(--scale), var(--scale));
    transition: transform 0.5s cubic-bezier(0.25, 1, 0.5, 1), filter 0.4s ease, opacity 0.6s ease, box-shadow 0.5s ease;
    
    opacity: 0;
    top: 30px;
}

.obra img {
    width: 100%;
    display: block; /* Quita espacios blancos residuales debajo de la imagen */
    border-radius: 12px;
    pointer-events: none;
}

.obra.destacada {
    grid-column: span 2;
    grid-row: span 2;
}

.obra.expandida {
    box-shadow: 0 30px 60px rgba(0,0,0,0.8);
    cursor: default;
}

/* EFECTO SPOTLIGHT */
.galeria.interactuando .obra:not(.enfocada):not(.expandida) {
    filter: brightness(30%) grayscale(60%);
    transform: scale(0.98);
}

.obra.visible {
    opacity: 1;
    top: 0;
}

/* OVERLAY BLUR Y OSCURO */
#galeria-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
    z-index: 998;
}

#galeria-overlay.activo {
    opacity: 1;
    pointer-events: auto;
}

/* BOTÓN X PARA CERRAR */
#btn-cerrar {
    position: fixed;
    top: 20px;
    right: 40px;
    font-size: 3.5rem;
    color: #fff;
    cursor: pointer;
    z-index: 1001;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease, transform 0.2s ease;
    text-shadow: 0 2px 10px rgba(0,0,0,0.8);
    user-select: none;
}

#btn-cerrar.activo {
    opacity: 1;
    pointer-events: auto;
}

#btn-cerrar:hover {
    transform: scale(1.15);
    color: #ff5e5e;
}

@media (max-width: 900px) {
    .galeria { grid-template-columns: repeat(2, 1fr); }
    .obra.destacada { grid-column: span 2; }
}

@media (max-width: 500px) {
    .galeria { grid-template-columns: 1fr; }
    .obra.destacada { grid-column: span 1; }
}