:root {
  --bg: #FAFAF8;
  --text: #1a1a1a;
  --accent: #2D7D46;
  --accent-hover: #236937;
  --border: #e5e5e5;
  --card-bg: #fff;
  --shadow: rgba(0, 0, 0, 0.08);
}

.dark-mode {
  --bg: #1a1a1a;
  --text: #FAFAF8;
  --accent: #4ade80;
  --accent-hover: #22c55e;
  --border: #333;
  --card-bg: #252525;
  --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Newsreader', Georgia, serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  padding: 2rem 2rem 0;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.header-left {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.site-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  text-decoration: none;
  color: var(--text);
  position: relative;
  letter-spacing: 0.02em;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--text);
  transform: scaleX(0);
  transition: transform 0.2s;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-link.active {
  color: var(--accent);
}

.nav-link.active::after {
  background: var(--accent);
}

.asterisk-btn {
  background: none;
  border: 1px solid var(--border);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--accent);
  cursor: pointer;
  transition: all 0.2s;
}

.asterisk-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.header-line {
  height: 1px;
  background: var(--border);
  margin-top: 1.5rem;
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-left {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.sort-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text);
  opacity: 0.7;
}

.filter-pills {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-pill {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.filter-pill:hover {
  background: var(--accent);
  color: white;
}

.filter-pill.active {
  background: var(--accent);
  color: white;
}

.filter-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.book-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  opacity: 0.7;
}

.add-book-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.add-book-btn:hover {
  background: var(--accent-hover);
}

/* Easter Egg */
.easter-egg {
  background: linear-gradient(135deg, var(--accent), #22c55e);
  color: white;
  padding: 1rem 2rem;
  text-align: center;
  margin-bottom: 2rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

/* Year Section */
.year-section {
  margin-bottom: 3rem;
}

.year-heading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

/* Books Grid */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .books-grid {
    grid-template-columns: repeat(7, 1fr);
    gap: 1.5rem;
  }
}

/* Book Card */
.book-card {
  position: relative;
  aspect-ratio: 2/3;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 12px var(--shadow);
  background: var(--card-bg);
}

.book-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 12px 24px var(--shadow);
}

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

.book-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(145deg, var(--accent), #1e5631);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
}

.placeholder-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  color: white;
  text-align: center;
  line-height: 1.3;
  word-break: break-word;
}

.book-badge {
  position: absolute;
  top: 6px;
  right: 6px;
  background: rgba(255,255,255,0.95);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--bg);
  border-radius: 8px;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.75rem;
  cursor: pointer;
  color: var(--text);
  opacity: 0.5;
  transition: opacity 0.2s;
  line-height: 1;
}

.modal-close:hover {
  opacity: 1;
}

.modal-body {
  padding: 1.5rem;
}

.search-container {
  position: relative;
  margin-bottom: 1.5rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-family: 'Newsreader', serif;
  font-size: 1rem;
  transition: border-color 0.2s;
}

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

.searching {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 0.5rem;
  color: var(--accent);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-top: none;
  max-height: 240px;
  overflow-y: auto;
  z-index: 10;
}

.search-result {
  padding: 0.75rem 1rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.search-result:hover {
  background: var(--card-bg);
}

.search-result:last-child {
  border-bottom: none;
}

.result-title {
  font-weight: 500;
  font-size: 0.9rem;
}

.result-author {
  font-size: 0.8rem;
  opacity: 0.7;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-family: 'Newsreader', serif;
  font-size: 1rem;
  transition: border-color 0.2s;
}

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

.rating-options {
  display: flex;
  gap: 0.75rem;
}

.rating-btn {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.rating-btn:hover {
  border-color: var(--accent);
}

.rating-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.rating-btn.small {
  flex: none;
  width: 40px;
  padding: 0.5rem;
}

.modal-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.btn-cancel {
  padding: 0.75rem 1.5rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-cancel:hover {
  background: var(--card-bg);
}

.btn-add {
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  border: none;
  color: white;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-add:hover {
  background: var(--accent-hover);
}

/* Detail Modal */
.detail-modal {
  max-width: 400px;
  position: relative;
}

.detail-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.detail-content {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.detail-cover-wrap {
  width: 160px;
  aspect-ratio: 2/3;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 8px 24px var(--shadow);
}

.detail-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(145deg, var(--accent), #1e5631);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: white;
  text-align: center;
}

.detail-info {
  text-align: center;
}

.detail-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.detail-author {
  opacity: 0.7;
  margin-bottom: 0.5rem;
}

.detail-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  opacity: 0.5;
  margin-bottom: 0.75rem;
}

.detail-rating {
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.detail-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  margin-top: 0.5rem;
}

.btn-remove {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid #dc2626;
  color: #dc2626;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-remove:hover {
  background: #dc2626;
  color: white;
}

/* Footer */
.footer {
  padding: 3rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.footer-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text);
  text-decoration: none;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.footer-link:hover {
  opacity: 1;
  color: var(--accent);
}

/* Mobile Adjustments */
@media (max-width: 640px) {
  .header {
    padding: 1.5rem 1rem 0;
  }
  
  .main-content {
    padding: 1.5rem 1rem;
  }
  
  .filter-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .filter-right {
    width: 100%;
    justify-content: space-between;
  }
  
  .nav {
    gap: 1rem;
  }
  
  .nav-link {
    font-size: 0.7rem;
  }
  
  .detail-modal {
    max-width: 100%;
  }
}