/* ============================================================
   Cloud Reader — Book Search & Discovery Styles
   ============================================================ */

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-surface-hover: #242736;
  --color-border: #2a2d3a;
  --color-text: #e1e4ed;
  --color-text-secondary: #8b8fa3;
  --color-primary: #6c8cff;
  --color-primary-hover: #8ba3ff;
  --color-accent-green: #34d399;
  --color-accent-yellow: #fbbf24;
  --color-accent-blue: #60a5fa;
  --color-accent-gray: #6b7280;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

/* --- Library Header --- */
.library-header {
  margin-bottom: 24px;
}

.library-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.library-header p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* --- Search Bar --- */
.search-bar {
  position: relative;
  margin-bottom: 16px;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--color-primary);
}

.search-input::placeholder {
  color: var(--color-text-secondary);
}

/* --- Filters --- */
.book-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  align-items: flex-end;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.filter-group select {
  padding: 8px 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  cursor: pointer;
  min-width: 140px;
}

.filter-group select:focus {
  border-color: var(--color-primary);
}

.clear-filters-btn {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.clear-filters-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* --- Book Grid --- */
.book-list {
  margin-top: 8px;
}

.result-count {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}

.book-card {
  display: flex;
  gap: 14px;
  padding: 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  color: inherit;
  font-family: inherit;
  transition: all 0.2s;
  width: 100%;
}

.book-card:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.book-card-cover {
  flex-shrink: 0;
  width: 60px;
  height: 90px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-placeholder {
  color: var(--color-text-secondary);
  opacity: 0.5;
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-card-info {
  flex: 1;
  min-width: 0;
}

.book-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 2px;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card-author {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.book-card-genre {
  font-size: 0.8rem;
  color: var(--color-primary);
  margin-bottom: 6px;
}

/* --- Status Badges --- */
.status-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 100px;
  text-transform: capitalize;
}

.status-want_to_read {
  background: rgba(96, 165, 250, 0.15);
  color: var(--color-accent-blue);
}

.status-reading {
  background: rgba(52, 211, 153, 0.15);
  color: var(--color-accent-green);
}

.status-finished {
  background: rgba(107, 114, 128, 0.15);
  color: var(--color-accent-gray);
}

.status-dnf {
  background: rgba(251, 191, 36, 0.15);
  color: var(--color-accent-yellow);
}

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-secondary);
}

.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state h3 {
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.empty-state p {
  max-width: 360px;
  margin: 0 auto;
  line-height: 1.5;
}

/* --- Loading --- */
.loading-spinner {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-secondary);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 12px;
}

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

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.pagination-btn {
  padding: 8px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.pagination-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-indicator {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* --- Book Detail --- */
.book-detail {
  max-width: 720px;
  margin: 0 auto;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: 24px;
  transition: all 0.2s;
  font-family: inherit;
}

.back-button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.book-detail-content {
  display: flex;
  gap: 28px;
}

.book-detail-cover {
  flex-shrink: 0;
  width: 180px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-surface);
}

.book-detail-cover img {
  width: 100%;
  display: block;
}

.cover-placeholder.large {
  width: 180px;
  height: 270px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  opacity: 0.3;
}

.book-detail-info {
  flex: 1;
}

.book-detail-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 4px;
  line-height: 1.3;
}

.book-detail-author {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.book-detail-genre {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.book-detail-status {
  margin-bottom: 20px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.book-detail-status .status-badge {
  margin-left: 6px;
}

.book-detail-description {
  margin-bottom: 20px;
}

.book-detail-description h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.book-detail-description p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.book-detail-meta {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  opacity: 0.7;
}

.book-detail-meta p {
  margin-bottom: 4px;
}

/* --- Error State --- */
.error-state {
  text-align: center;
  padding: 48px 24px;
  color: #ef4444;
}

.error-state p {
  margin-bottom: 16px;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .book-grid {
    grid-template-columns: 1fr;
  }

  .book-detail-content {
    flex-direction: column;
  }

  .book-detail-cover {
    width: 140px;
  }

  .cover-placeholder.large {
    width: 140px;
    height: 210px;
  }

  .book-filters {
    flex-direction: column;
  }

  .filter-group select {
    width: 100%;
  }
}