:root {
  --bg-color: #f9fafb;
  --text-color: #1f2937;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #ef4444;
  --danger-hover: #b91c1c;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  line-height: 1.5;
}

header {
  background-color: var(--card-bg);
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  margin-bottom: 3rem;
}

h2 {
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

input[type="text"] {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

button {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
}

button:hover {
  background-color: var(--primary-hover);
}

button:disabled {
  background-color: #9ca3af;
  cursor: not-allowed;
}

.results-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card .cover {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background-color: #f3f4f6;
}

.card-info {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-info h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-info p {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: #4b5563;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-info .rating {
  font-weight: bold;
  color: #f59e0b;
}

.card-info button {
  margin-top: auto;
}

.remove-btn {
  background-color: var(--danger);
}

.remove-btn:hover {
  background-color: var(--danger-hover);
}

.shelf-controls {
  margin-bottom: 1rem;
}

.error {
  color: var(--danger);
}