* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: #f4f4f4;
}

.header {
  display: flex;
  align-items: center;
  background: #fff;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid #ccc;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  height: 40px;
  margin-right: 10px;
}

.app-title {
  font-size: 1.5rem;
  color: #333;
}

/* Splash */
#splash-screen {
  position: fixed;
  inset: 0;
  background: #121212;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: fadeOut 1s ease-out forwards;
  animation-delay: 2s;
}

.splash-content {
  text-align: center;
}

.splash-logo {
  width: 120px;
  margin-bottom: 20px;
  animation: fadeIn 1.5s ease-in-out;
}

.splash-content h1 {
  font-size: 1.8rem;
  animation: float 2s ease-in-out infinite;
}

.splash-content span {
  color: #00bcd4;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes fadeOut {
  to { opacity: 0; visibility: hidden; }
}

/* Category Filter */
#category-filter {
  text-align: center;
  margin: 1rem;
}

#categorySelect {
  padding: 0.5rem;
  font-size: 1rem;
}

/* Masonry */
.masonry {
  column-count: 3;
  column-gap: 1rem;
  padding: 1rem;
}
.image-tile {
  break-inside: avoid;
  margin-bottom: 1rem;
  transition: transform 0.3s;
  cursor: pointer;
}
.image-tile img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.image-tile:hover {
  transform: scale(1.02);
}
.share-btn {
  display: block;
  margin-top: 0.5rem;
  text-align: center;
  font-size: 0.9rem;
  background: #00bcd4;
  color: white;
  border: none;
  border-radius: 4px;
  padding: 4px 8px;
  cursor: pointer;
}
@media (max-width: 768px) {
  .masonry { column-count: 2; }
}
@media (max-width: 480px) {
  .masonry { column-count: 1; }
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 1000;
}
.modal-content {
  display: block;
  max-width: 90%;
  max-height: 80vh;
  margin: auto;
  margin-top: 10vh;
  border-radius: 8px;
}
#close {
  position: absolute;
  top: 15px;
  right: 25px;
  font-size: 2rem;
  color: #fff;
  cursor: pointer;
}
.nav-btn {
  position: absolute;
  top: 50%;
  font-size: 2rem;
  color: #fff;
  background: rgba(0,0,0,0.3);
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
}
#prev { left: 20px; }
#next { right: 20px; }

/* Loader */
.loader {
  text-align: center;
  padding: 1rem;
  font-size: 1rem;
  color: #888;
}