* {
  box-sizing: border-box;
}

#bookGrid {
  width: 70vh;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  padding: 0 1rem 1rem;
}

#iframeContainer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--panel);
  display: flex;
  flex-direction: column;
  z-index: 9999;
  display: none;
  transition: none;
}

#iframeContainer:not(.hidden) {
  display: flex;
}

.iframe-header {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 0.25rem 0.5rem;
  background: rgba(0, 0, 0, 0.6);
}

.iframe-header .btn {
  background: rgba(0, 0, 0, 0.6);
  border: none;
  color: #fff;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: 0.2s ease;
}

.iframe-header .btn:hover {
  background: var(--accent2);
}

#gameIframe {
  flex: 1;
  width: 100%;
  border: none;
}

.card {
  background: var(--panel);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
}

/* ZOOM effect (replaces slide) */
.card:hover {
  transform: scale(1.05);
  box-shadow: 0 5px 20px rgba(162, 0, 255, 0.3);
}

.card-image {
  position: relative;
}

.card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.25s ease;
}

/* Image zoom on hover */
.card:hover img {
  transform: scale(1.08);
}

/* TITLE OVERLAY (top, 50% black) */
.title-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: 6px 10px;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: 5;
}

.card-title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  text-align: center;
}

/* Favorite button */
.favorite-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(0, 0, 0, 0.6);
  border: none;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.favorite-btn i {
  color: #999;
  transition: color 0.25s ease;
}

.favorite-btn.active i {
  color: var(--accent2);
}

/* Play overlay */
.play-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 150px;
  background: transparent;
  opacity: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.25s ease;
}

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

.play-overlay i {
  color: var(--accent2);
  font-size: 1.5rem;
  transition: transform 0.25s ease;
}

.play-overlay:hover i {
  transform: scale(1.2);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
  justify-content: center;
  padding: 1rem;
}

.filters input,
.filters select {
  background: var(--panel);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  outline: none;
  transition: border 0.25s ease, background 0.25s ease;
  width: 200px;
}

.filters input:focus,
.filters select:focus {
  border-color: var(--accent2);
}

.fav-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.9rem;
  text-align: left;
  width: 3em;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100%;
}

.content {
  margin-left: 5em;
  width: calc(100% - 50px);
  overflow-y: scroll;
  height: 100vh;
  scrollbar-width: thin;
  scrollbar-color: var(--accent2) var(--panel);
}

.content::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.content::-webkit-scrollbar-track {
  background: var(--panel);
}

.content::-webkit-scrollbar-thumb {
  background: var(--accent2);
  border-radius: 4px;
}

.iframe-header .btn.active i {
  color: var(--accent2);
}

.grid-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 1rem;
  margin: 0 auto;
  max-width: 100%;
}

.vertical-ad {
  width: 160px;
  flex-shrink: 0;
}

#bookGrid {
  flex: 1;
  max-width: 70vw;
  min-width: 320px;
}

@media (max-width: 1024px) {
  .grid-container {
    flex-direction: column;
    align-items: center;
  }
  .vertical-ad {
    margin-bottom: 1rem;
  }
  #bookGrid {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  #bookGrid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  .filters {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 600px) {
  #bookGrid {
    grid-template-columns: repeat(2, 1fr);
  }
}