/* style.css - diseño limpio, moderno y responsivo */

/* Variables */
:root{
  --bg: #f7f8fb;
  --card: #ffffff;
  --muted: #6b7280;
  --accent: #4f46e5;
  --shadow: 0 6px 18px rgba(15,23,42,0.06);
  --radius: 12px;
  --gap: 12px;
  --max-width: 1100px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  background:linear-gradient(180deg,var(--bg),#eef2ff 60%);
  color:#111827;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

/* Header */
.site-header{
  padding:20px;
  text-align:center;
  background:transparent;
}
.site-header h1{margin:0;font-size:1.6rem}
.subtitle{margin:6px 0 12px;color:var(--muted);font-size:0.95rem}
.top-nav{display:inline-flex;gap:8px}
.nav-btn{
  padding:8px 12px;border-radius:999px;border:1px solid transparent;background:rgba(255,255,255,0.8);
  cursor:pointer;font-weight:600;box-shadow:var(--shadow)
}
.nav-btn.active{
  background:linear-gradient(90deg,var(--accent),#7c3aed);
  color:white;border-color:rgba(0,0,0,0.04)
}

/* Main container */
.container{width:100%;max-width:var(--max-width);margin:12px auto;padding:16px}

/* Sections */
.section{display:none}
.section.visible{display:block}

/* Gallery grid */
.gallery-grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:var(--gap);
  margin-top:16px;
}

/* card */
.thumb{
  background:var(--card);
  border-radius:10px;
  overflow:hidden;
  box-shadow:var(--shadow);
  position:relative;
  min-height:140px;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
}
.thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  aspect-ratio: 4/3;
}

/* Pagination / controls */
.gallery-controls{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  margin-top:6px;
}
.page-btn{
  padding:8px 12px;border-radius:8px;border:1px solid rgba(0,0,0,0.06);
  background:white;cursor:pointer;
}
.page-numbers{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.page-numbers button{
  padding:6px 9px;border-radius:8px;border:1px solid rgba(0,0,0,0.06);background:white;cursor:pointer
}
.page-numbers button.active{background:var(--accent);color:white;border-color:transparent}

/* Videos grid */
.videos-grid{
  display:grid;
  grid-template-columns: repeat(2,1fr);
  gap:16px;
  margin-top:12px;
}

/* Lightbox */
.lightbox{
  position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(2,6,23,0.7);z-index:2000;opacity:0;pointer-events:none;transition:opacity .18s ease;
}
.lightbox[aria-hidden="false"]{opacity:1;pointer-events:auto}
.lightbox-content{max-width:90vw;max-height:85vh;display:flex;flex-direction:column;align-items:center}
.lightbox img{max-width:90vw;max-height:78vh;border-radius:10px;box-shadow:var(--shadow);display:block}
.lightbox-caption{color:white;margin-top:8px}
.close-lightbox{
  position:absolute;top:18px;right:18px;background:transparent;border:0;color:white;font-size:20px;cursor:pointer
}
.nav{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,0.12);border:0;color:white;padding:10px;border-radius:50%;cursor:pointer}
.prev{left:18px}.next{right:18px}

/* Footer */
.site-footer{text-align:center;padding:16px;color:var(--muted)}

/* Responsive */
@media (max-width: 1024px){
  .gallery-grid{grid-template-columns:repeat(3,1fr)}
  .videos-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 700px){
  .gallery-grid{grid-template-columns:repeat(2,1fr)}
  .videos-grid{grid-template-columns:1fr}
  .site-header h1{font-size:1.2rem}
}
@media (max-width: 420px){
  .gallery-grid{grid-template-columns:1fr}
}