:root {
  --lego-red: #d2001f;
  --lego-yellow: #ffd500;
  --lego-blue: #0057a8;
  --lego-green: #00852b;
  --bg: #f4f4f2;
  --card-bg: #ffffff;
  --text: #222;
  --muted: #666;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header.hero {
  background: var(--lego-red);
  color: white;
  padding: 3rem 1.5rem 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

header.hero::after {
  content: "";
  position: absolute;
  bottom: -20px;
  left: 0;
  right: 0;
  height: 40px;
  background-image: radial-gradient(circle, var(--lego-red) 10px, transparent 11px);
  background-size: 50px 50px;
  background-position: 0 0;
}

header.hero h1 {
  font-size: 2.6rem;
  margin: 0 0 0.5rem;
  font-weight: 800;
  letter-spacing: 1px;
}

header.hero p {
  margin: 0;
  font-size: 1.1rem;
  opacity: 0.95;
}

nav.back-link {
  display: block;
  text-align: center;
  padding: 0.6rem;
  background: #b3001a;
}

nav.back-link a {
  color: white;
  text-decoration: none;
  font-size: 0.9rem;
  opacity: 0.9;
}

nav.back-link a:hover { opacity: 1; text-decoration: underline; }

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.filter-btn {
  border: 2px solid var(--lego-blue);
  background: white;
  color: var(--lego-blue);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.15s ease;
}

.filter-btn:hover { background: #eaf2fa; }

.filter-btn.active {
  background: var(--lego-blue);
  color: white;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--card-bg);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.card img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  display: block;
  background: #e8e8e8;
}

.card-body {
  padding: 1rem 1.1rem 1.2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
}

.card .summary {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 0.8rem;
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
}

.tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  color: white;
}

.tag.tag-star-wars { background: var(--lego-blue); }
.tag.tag-technic { background: var(--lego-green); }
.tag.tag-moc { background: var(--lego-red); }
.tag.tag-ucs { background: #8b3fd1; }
.tag.tag-default { background: #888; }

.meta {
  display: flex;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px dashed #ddd;
  padding-top: 0.6rem;
}

.meta span { display: flex; gap: 0.3rem; align-items: center; }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 100;
}

.modal-overlay.open { display: flex; }

.modal {
  background: white;
  border-radius: 10px;
  max-width: 700px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 0.6rem;
  right: 0.9rem;
  background: none;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  color: #888;
  line-height: 1;
}

.modal-gallery {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 1rem;
  background: #f0f0f0;
}

.modal-gallery img {
  height: 220px;
  border-radius: 6px;
  flex-shrink: 0;
}

.modal-content { padding: 1.2rem 1.5rem 1.8rem; }
.modal-content h2 { margin-top: 0; }

.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}