:root {
  --bg-color: #14181c;
  --card-bg: #1c2228;
  --accent-green: #00e054;
  --accent-orange: #ff8000;
  --accent-red: #ff4d4d;
  --accent-blue: #40bcf4;
  --text-main: #9ab;
  --text-bright: #ffffff;
  --border-color: #2c3440;
  --star-color: #00e054;
  --blank-cover-bg: #101418;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
}

/* --- Navbar --- */
header {
  background-color: #181d23;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1.5rem;
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--text-bright);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.logo span {
  color: var(--accent-green);
}

.btn-log {
  background-color: var(--accent-green);
  color: #000;
  font-weight: 700;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
  transition: background 0.2s;
}

.btn-log:hover {
  background-color: #00b341;
}

/* --- Layout --- */
.container {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.section-title {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-title .count {
  color: var(--accent-blue);
  font-weight: 600;
}

/* Cover styling with blank fallback */
.cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background-color: var(--blank-cover-bg);
  display: block;
}

/* Blank cover state */
.cover-img:not([src]), 
.cover-img[src=""] {
  visibility: hidden;
}

.cover-wrapper {
  background-color: var(--blank-cover-bg);
  width: 100%;
  height: 100%;
  position: relative;
}

/* --- Book Grid --- */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1.2rem;
  margin-bottom: 3rem;
}

.book-card {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  transition: transform 0.2s, border-color 0.2s;
  aspect-ratio: 2/3;
}

.book-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-green);
}

.book-card .overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  opacity: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0.8rem;
  transition: opacity 0.2s;
  z-index: 2;
}

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

.overlay-title {
  color: var(--text-bright);
  font-weight: 600;
  font-size: 0.85rem;
  line-height: 1.2;
}

.overlay-author {
  font-size: 0.75rem;
  color: var(--text-main);
}

.overlay-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.btn-overlay {
  background: var(--accent-green);
  color: #000;
  border: none;
  padding: 0.3rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: 3px;
  cursor: pointer;
  text-transform: uppercase;
  text-align: center;
}

.btn-overlay.delete {
  background: transparent;
  color: var(--accent-red);
  border: 1px solid var(--accent-red);
}

.btn-overlay.delete:hover {
  background: var(--accent-red);
  color: #fff;
}

.empty-state {
  grid-column: 1 / -1;
  padding: 2.5rem;
  text-align: center;
  background: var(--card-bg);
  border: 1px dashed var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  font-size: 0.9rem;
}

/* --- Activity Feed / Reviews --- */
.feed {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.review-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.2rem;
  display: flex;
  gap: 1.2rem;
  position: relative;
}

.review-poster-wrap {
  width: 70px;
  height: 105px;
  border-radius: 3px;
  flex-shrink: 0;
  overflow: hidden;
  background-color: var(--blank-cover-bg);
  border: 1px solid var(--border-color);
}

.review-poster-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.review-content {
  flex-grow: 1;
}

.review-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.2rem;
}

.review-book-title {
  color: var(--text-bright);
  font-weight: 700;
  font-size: 1.1rem;
}

.review-author {
  font-size: 0.85rem;
  color: #678;
  margin-bottom: 0.4rem;
}

.stars {
  color: var(--star-color);
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.95rem;
  color: #c8d4e0;
  margin-top: 0.5rem;
}

.review-controls {
  display: flex;
  gap: 10px;
}

.btn-text-action {
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 2px 4px;
  transition: color 0.15s;
}

.btn-text-action:hover {
  color: var(--text-bright);
}

.btn-text-action.delete-hover:hover {
  color: var(--accent-red);
}

/* --- Modal & Search Results --- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  width: 100%;
  max-width: 520px;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  color: var(--text-bright);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

.form-group {
  margin-bottom: 1rem;
  position: relative;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
  color: var(--text-main);
}

.form-group input, 
.form-group textarea {
  width: 100%;
  background: #14181c;
  border: 1px solid var(--border-color);
  color: var(--text-bright);
  padding: 0.6rem;
  border-radius: 4px;
  font-family: inherit;
}

.form-group textarea {
  resize: vertical;
  height: 90px;
}

/* Open Library Search Dropdown */
.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #181d23;
  border: 1px solid var(--border-color);
  border-radius: 0 0 4px 4px;
  max-height: 240px;
  overflow-y: auto;
  z-index: 200;
  display: none;
}

.search-results.active {
  display: block;
}

.search-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border-color);
  gap: 10px;
}

.search-item-info-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  overflow: hidden;
}

.search-thumb-wrap {
  width: 32px;
  height: 48px;
  background-color: var(--blank-cover-bg);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  flex-shrink: 0;
  overflow: hidden;
}

.search-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.search-item-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.search-item-title {
  color: var(--text-bright);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-item-author {
  font-size: 0.75rem;
  color: var(--text-main);
}

.search-actions {
  display: flex;
  gap: 6px;
}

.btn-action-sm {
  background: #2c3440;
  border: 1px solid #3d4857;
  color: var(--text-bright);
  padding: 0.3rem 0.6rem;
  font-size: 0.7rem;
  border-radius: 3px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}

.btn-action-sm:hover {
  background: var(--accent-green);
  color: #000;
  border-color: var(--accent-green);
}

.btn-action-sm.blue-hover:hover {
  background: var(--accent-blue);
  color: #000;
  border-color: var(--accent-blue);
}

.selected-book-preview {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #14181c;
  padding: 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--accent-green);
  margin-bottom: 1rem;
}

.selected-preview-thumb {
  width: 40px;
  height: 60px;
  background-color: var(--blank-cover-bg);
  border-radius: 2px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

.selected-preview-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.selected-book-details {
  flex: 1;
}

.selected-book-details div:first-child {
  color: var(--text-bright);
  font-weight: 600;
  font-size: 0.9rem;
}

.selected-book-details div:last-child {
  font-size: 0.8rem;
  color: var(--text-main);
}

.star-rating-input {
  display: flex;
  gap: 5px;
  font-size: 1.5rem;
  cursor: pointer;
  color: #456;
}

.star-rating-input span.active {
  color: var(--star-color);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
  .review-card {
    flex-direction: column;
  }
  .review-poster-wrap {
    width: 90px;
    height: 135px;
  }
}