body {
  font-family: Arial, sans-serif;
  background-size: cover;
  background-position: center center;
  background-attachment: fixed;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: white;
}

.container {
  max-width: 600px;
  margin: 50px auto;
  padding: 30px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

input[type="file"] {
  margin: 20px 0;
}

button {
  padding: 10px 20px;
  background-color: #0070f3;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #0055cc;
}

#auth-forms input {
  display: block;
  width: 100%;
  margin-bottom: 12px;
  padding: 8px;
  font-size: 16px;
  box-sizing: border-box;
}

.modal {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

.modal-content {
  background: #fff;
  padding: 24px;
  border-radius: 8px;
  width: 300px;
  position: relative;
}

.hidden {
  display: none;
}

.close-button {
  position: absolute;
  right: 12px;
  top: 8px;
  font-size: 24px;
  cursor: pointer;
}

#login-register-btn {
  background-color: rgba(59, 130, 246, 0);
  color: rgba(255, 255, 255, 0);
  border: none;
}

#user-profile {
  background-color: rgba(59, 130, 246, 0);
}

#dropdown-menu {
  background-color: rgba(255, 255, 255, 0);
  box-shadow: none;
  display: none;
}

#login-register-btn.hidden {
  display: none;
}

#user-profile.hidden {
  display: none;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  padding: 0;
}

.gallery-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.gallery-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.gallery-thumb-wrapper {
  position: relative;
  width: 100%;
  padding-top: 75%;
  overflow: hidden;
  background: #f3f4f6;
}

.gallery-thumb {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.gallery-card:hover .gallery-thumb {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.gallery-card:hover .gallery-overlay {
  opacity: 1;
}

.gallery-zoom-icon {
  font-size: 2rem;
  filter: drop-shadow(0 1px 3px rgba(0,0,0,0.4));
}

.gallery-card-info {
  padding: 10px 12px;
}

.gallery-card-name {
  font-size: 0.8rem;
  color: #374151;
  margin: 0 0 2px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.gallery-card-size {
  font-size: 0.7rem;
  color: #9ca3af;
  margin: 0;
}

.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.lightbox-overlay.hidden {
  display: none;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
  user-select: none;
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 24px;
  background: none;
  border: none;
  color: white;
  font-size: 2.5rem;
  cursor: pointer;
  z-index: 10001;
  line-height: 1;
  padding: 4px 10px;
  transition: opacity 0.2s;
}

.lightbox-close:hover {
  opacity: 0.7;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: white;
  font-size: 3rem;
  cursor: pointer;
  z-index: 10001;
  padding: 12px 16px;
  border-radius: 8px;
  transition: background 0.2s;
  user-select: none;
  line-height: 1;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.3);
}

.lightbox-prev {
  left: 16px;
}

.lightbox-next {
  right: 16px;
}

.lightbox-info {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.85rem;
  margin-top: 16px;
  text-align: center;
  user-select: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.animate-spin {
  animation: spin 1s linear infinite;
}