@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500&display=swap');

/* =========================================================
   TOKENS
   ========================================================= */
:root {
  --font-size: 18px;
  --font-height: 26px;
  --font-family: "Space Grotesk", Helvetica, Arial, sans-serif;
  --bg: #ffffff;
  --bg-light: #f5f5f5;
  --placeholder: #d9d9d9;          /* gris de los huecos de imagen */
  --text: #000000;
  --text-light: #696969;
  --spacer: 0.75rem;
  --speed: 400ms;

  font-family: var(--font-family);
  font-size: var(--font-height);   /* 1rem = una línea de texto */
  color: var(--text);
}

/* =========================================================
   BASE
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); }
body { position: relative; -webkit-font-smoothing: antialiased; }
body * { font-size: var(--font-size); line-height: 1rem; }
h1, h2, p, figure { margin: 0; font-weight: 400; }
a { color: inherit; text-decoration: none; transition: opacity var(--speed) ease-in-out; }
img { display: block; }

/* Bandas blancas fijas arriba y abajo: las imágenes "desaparecen" bajo ellas al hacer scroll */
body::before, body::after {
  content: "";
  position: fixed;
  left: 0; right: 0;
  height: var(--spacer);
  background: var(--bg);
  pointer-events: none;
  z-index: 5000;
}
body::before { top: 0; }
body::after { bottom: 0; }
body.about-is-open { overflow: hidden; }

/* Enlaces dentro de texto: atenuados, se encienden al pasar */
p > a, h2 > a { opacity: .5; }
p > a:hover, h2 > a:hover { opacity: 1; }

/* =========================================================
   CABECERA
   ========================================================= */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 8000;
  padding: 0 var(--spacer);
  background: var(--bg);
}
.menu {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1rem 0;
}
.menu-item { transition: opacity var(--speed) ease-in-out; }
.menu-item:hover { opacity: .5; }
.menu-btn {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  margin: 0;
  cursor: pointer;
}

/* =========================================================
   PANEL "SOBRE"
   ========================================================= */
.about {
  position: fixed;
  inset: 0;
  z-index: 6000;
  display: grid;
  grid-template-columns: 1fr;
  column-gap: var(--spacer);
  padding: 3rem var(--spacer) var(--spacer);
  background: var(--bg);
  overflow: auto;
  opacity: 0;
  pointer-events: none;
  transform: translateY(1rem);
  transition: transform var(--speed) ease-in-out, opacity var(--speed) ease-in-out;
}
.about.is-open { opacity: 1; pointer-events: auto; transform: none; }
.about-content { max-width: 55ch; align-self: start; }
.about-content p { margin-bottom: 1rem; }

/* =========================================================
   REJILLA DE PROYECTOS (portada y relacionados)
   ========================================================= */
.posts {
  display: grid;
  grid-auto-flow: dense;
  grid-template-columns: 100%;
  gap: var(--spacer);
  padding: 3rem var(--spacer) 0;
}
.thumb { margin: 0; }
.thumb-link {
  display: block;
  position: relative;
  width: 100%;
  padding-bottom: 67.65%;           /* proporción fija de las miniaturas */
  background: var(--placeholder);
  transition: opacity var(--speed) ease-in-out;
}
.thumb-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;                 /* recorta cualquier foto al formato de la miniatura */
  transition: opacity var(--speed) ease-in-out;
}
.thumb-link:hover .thumb-image { opacity: .5; }

/* Relacionados, bajo la galería del interior */
.related {
  position: relative;
  z-index: 5900;
  background: var(--bg);
  padding-top: 0;
  padding-bottom: var(--spacer);
}

/* =========================================================
   INTERIOR DE PROYECTO
   ========================================================= */
.single-page { padding: 3rem var(--spacer) var(--spacer); }

.gallery-image-container {
  margin: 0 0 var(--spacer);
  background: var(--placeholder);
}
.gallery-image {
  display: block;
  width: 100%;
  height: auto;                      /* la foto se ve entera, con su proporción real */
}
.gallery-video {
  position: relative;
  background: var(--placeholder);
  height: 0;
  padding-bottom: 56.25%;
  overflow: hidden;
}
.gallery-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.single-info { padding: 0 0 1rem; }
.single-authors { color: var(--text); }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (min-width: 750px) {
  .menu,
  .about,
  .posts,
  .single-page {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: var(--spacer);
  }
  .posts { gap: var(--spacer); }
  .about-content { grid-column-start: 2; }

  .single-page { grid-auto-flow: dense; gap: var(--spacer); }
  .gallery { grid-column: 2; }

  /* Título y autor fijos abajo a la izquierda */
  .single-info {
    position: fixed;
    left: 0;
    bottom: -5px;
    padding: var(--spacer);
    z-index: 5500;
  }
}

@media (min-width: 1800px) {
  .posts { grid-template-columns: repeat(4, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}