:root {
  --primary: #2c3e50;
  --secondary: #8b4513;
  --accent: #d4a574;
  --bg: #faf8f5;
  --card-bg: #ffffff;
  --text: #2c3e50;
  --text-light: #666;
  --border: #e0d5c8;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 8px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  background: linear-gradient(135deg, var(--primary) 0%, #34495e 100%);
  color: white;
  padding: 60px 0;
  text-align: center;
  margin-bottom: 40px;
}

.site-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: 0.1em;
}

.site-subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  font-weight: 300;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
  align-items: center;
}

.search-box {
  flex: 1;
  min-width: 280px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  background: var(--card-bg);
  transition: var(--transition);
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-light);
}

.filters {
  display: flex;
  gap: 15px;
  align-items: center;
}

.filters select {
  padding: 10px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.filters select:focus {
  outline: none;
  border-color: var(--accent);
}

.book-count {
  color: var(--text-light);
  font-size: 14px;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}

.book-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.book-cover {
  aspect-ratio: 2/3;
  background-size: cover;
  background-position: center;
  position: relative;
}

.book-cover.default {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  text-align: center;
}

.cover-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: rgba(255,255,255,0.95);
  text-shadow: 0 2px 4px rgba(0,0,0,0.4);
  line-height: 1.4;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.book-info {
  padding: 16px;
}

.book-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--primary);
}

.book-author {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-meta {
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-light);
  flex-wrap: wrap;
}

.book-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.loading {
  text-align: center;
  padding: 60px;
  color: var(--text-light);
  font-size: 1.1rem;
  grid-column: 1 / -1;
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-light);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 20px;
}

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

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.7);
  z-index: 1000;
  overflow-y: auto;
  padding: 20px;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(0,0,0,0.1);
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 10;
}

.modal-close:hover {
  background: rgba(0,0,0,0.2);
}

.modal-body {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 30px;
  padding: 30px;
}

.modal-cover {
  aspect-ratio: 2/3;
  background-size: cover;
  background-position: center;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.modal-cover.default {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
}

.modal-cover.default .cover-title {
  font-size: 1.4rem;
  line-height: 1.5;
}

.modal-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.3;
}

.modal-author {
  font-size: 1.1rem;
  color: var(--text-light);
}

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-light);
}

.modal-meta span {
  background: var(--bg);
  padding: 4px 10px;
  border-radius: 4px;
}

.modal-summary {
  line-height: 1.8;
  color: var(--text);
  font-size: 0.95rem;
}

.footer {
  background: var(--primary);
  color: white;
  text-align: center;
  padding: 30px 0;
  margin-top: 60px;
}

.footer p {
  opacity: 0.9;
}

@media (max-width: 768px) {
  .header {
    padding: 40px 0;
  }
  
  .site-title {
    font-size: 2rem;
  }
  
  .controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .books-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .modal-body {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  
  .modal-cover {
    max-width: 200px;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .books-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .book-info {
    padding: 12px;
  }
  
  .book-title {
    font-size: 0.9rem;
  }
}