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

body {
  font-family: 'Segoe UI', sans-serif;
  background: #f4f6f9;
  color: #333;
}

header {
  background: #1a73e8;
  color: white;
  text-align: center;
  padding: 5px 10px;
}

header h1 { font-size: 2.5rem; margin-top: 15px; margin-bottom: 2px; }
header h2 { font-size: 1.5rem; margin-top: 2px; margin-bottom: 2px; }
header p  { font-size: 1rem; opacity: 0.85; margin-top: 15px ; margin-bottom: 10px}

/* Controls Bar */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 24px;
  background: white;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  justify-content: center;
}

.controls input,
.controls select {
  padding: 10px 16px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.95rem;
  min-width: 220px;
}

.controls input:focus,
.controls select:focus {
  outline: none;
  border-color: #1a73e8;
}

/* Results Info */
.results-info {
  text-align: center;
  padding: 12px;
  color: #666;
  font-size: 0.9rem;
}

/* Book Grid */
.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  padding: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Book Card */
.book-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.14);
}

.book-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.book-info { padding: 16px; }
.book-info h3 { font-size: 1rem; margin-bottom: 4px; }
.book-info .author { color: #666; font-size: 0.85rem; margin-bottom: 8px; }

.book-info .category {
  display: inline-block;
  background: #e8f0fe;
  color: #1a73e8;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
}

.book-info .description {
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 14px;
  line-height: 1.5;
}

.book-info a {
  display: inline-block;
  background: #1a73e8;
  color: white;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.85rem;
  transition: background 0.2s;
}

.book-info a:hover { background: #1558b0; }

/* No Results */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: #999;
  grid-column: 1 / -1;
  font-size: 1.1rem;
}

footer {
  text-align: center;
  padding: 24px 24px 10px;
  background: #fff;
  color: #999;
  font-size: 0.85rem;
  margin-top: 40px;
  border-top: 1px solid #eee;
}

.file-badge {
  display: inline-block;
  background: #fce8e6;
  color: #c5221f;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
  margin-left: 6px;
}

.language-badge {
  display: inline-block;
  background: #e6f4ea;
  color: #137333;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
  margin-left: 6px;
}

.card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-download {
  background: #34a853 !important;
}

.btn-download:hover {
  background: #2d8f47 !important;
}

.fb-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 15px;
  color: #1877f2;
  transition: color 0.2s, transform 0.2s;
}

.fb-link:hover {
  color: #0f5bbf;
  transform: translateY(-2px);
}

.fb-icon {
  width: 28px;
  height: 28px;
  fill: currentColor;
}