/* 1. Variables y Reset */
:root {
  --bg-dark: #0a0a0a;
  --bg-panel: #1a1a1a;
  --btn-bg: linear-gradient(45deg, #ff5e00, #ffa500);
  --text-light: #f2f2f2;
  --shadow: rgba(0,0,0,0.7);
  --hover-green: #4caf50;
  --font-sans: 'Rajdhani', sans-serif;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: var(--font-sans);
  background: var(--bg-dark);
  color: var(--text-light);
  height: 100vh;
  display: grid;
  grid-template-rows: 15% 85%;
}

/* 2. Header */
.site-header {
  background: #111;
  box-shadow: 0 2px 6px var(--shadow);
}
.nav-menu {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}
.nav-menu button {
  padding: 0.8rem 1.5rem;
  font-size: 1.1rem;
  background: var(--btn-bg);
  border: none;
  border-radius: 0.5rem;
  color: var(--bg-dark);
  cursor: pointer;
  box-shadow: 0 4px 8px var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.nav-menu button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px var(--shadow);
}

/* 3. Layout principal */
.content {
  display: flex;
  height: 100%;
}
#viewer3d {
  width: 70%;
  background: #000;
}

/* 4. Panel lateral */
.side-panel {
  width: 30%;
  background: var(--bg-panel);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: -4px 0 10px var(--shadow);
}

/* 5. Filtros desplegables */
.filters {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.filter label {
  display: block;
  margin-bottom: 0.3rem;
  font-weight: bold;
}
.filter select {
  width: 100%;
  padding: 0.6rem;
  border: 2px solid #444;
  border-radius: 0.4rem;
  background: #222;
  color: var(--text-light);
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.filter select:hover {
  border-color: var(--hover-green);
  box-shadow: 0 0 5px rgba(76,175,80,0.6);
}

/* 6. Galería 3×3 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  flex-grow: 1;
  overflow-y: auto;
}
.gallery-item {
  background: #222;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.3rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.gallery-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow);
}

/* 7. Responsive básico */
@media (max-width: 768px) {
  .content { flex-direction: column; }
  #viewer3d { width: 100%; height: 60%; }
  .side-panel { width: 100%; height: 40%; }
}