* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 24px;
  font-family: Arial, sans-serif;
  background: #f8f7f4;
  color: #111;
}

header {
  text-align: center;
  margin-bottom: 24px;
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

header p {
  margin-top: 8px;
  font-size: 1rem;
  color: #444;
}

nav {
  text-align: center;
  margin-bottom: 28px;
}

nav a {
  display: inline-block;
  margin: 0 8px;
  padding: 10px 14px;
  text-decoration: none;
  color: #111;
  border: 1px solid #111;
  background: #fff;
  border-radius: 999px;
  font-weight: bold;
}

nav a:hover {
  background: #111;
  color: #fff;
}

.filters {
  text-align: center;
  margin-bottom: 28px;
}

button {
  margin: 6px;
  padding: 10px 14px;
  border: 1px solid #111;
  background: #fff;
  color: #111;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.95rem;
}

button:hover {
  background: #111;
  color: #fff;
}

button.active {
  background: #111;
  color: #fff;
}

/* Masonry-style layout using CSS columns */
.gallery {
  column-count: 3;
  column-gap: 18px;
}

.card {
  break-inside: avoid;
  -webkit-column-break-inside: avoid;
  margin-bottom: 18px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.card img,
.card video {
  width: 100%;
  display: block;
}

.caption {
  padding: 12px 14px 8px;
  font-size: 0.95rem;
  line-height: 1.4;
}

.tags {
  padding: 0 14px 14px;
  font-size: 0.8rem;
  color: #666;
}

.empty-message {
  text-align: center;
  font-size: 1rem;
  color: #555;
  padding: 40px 0;
}

/* Tablet */
@media (max-width: 900px) {
  .gallery {
    column-count: 2;
  }
}

/* Mobile */
@media (max-width: 600px) {
  body {
    padding: 16px;
  }

  header h1 {
    font-size: 1.6rem;
  }

  .gallery {
    column-count: 1;
  }

  nav a,
  button {
    font-size: 0.9rem;
  }
  .footer {
  margin-top: 60px;
  text-align: center;
  font-size: 0.8rem;
  color: #666;
  line-height: 1.5;
  padding: 20px 10px;
  width: 100%;
  }
}