:root {
  --bg: #f4f1ec;
  --surface: #ffffff;
  --surface-hover: #faf8f5;
  --border: #e5dfd6;
  --text: #1c1917;
  --text-muted: #78716c;
  --primary: #b45309;
  --primary-hover: #92400e;
  --primary-light: #fef3c7;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --danger-light: #fee2e2;
  --success: #059669;
  --shadow: 0 1px 3px rgba(28, 25, 23, 0.08), 0 4px 12px rgba(28, 25, 23, 0.06);
  --shadow-lg: 0 8px 30px rgba(28, 25, 23, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: 'DM Sans', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

/* Header */
.header {
  background: linear-gradient(135deg, #78350f 0%, #b45309 50%, #d97706 100%);
  color: white;
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow-lg);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-icon {
  font-size: 2.5rem;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.brand h1 {
  font-family: 'Playfair Display', serif;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand p {
  font-size: 0.875rem;
  opacity: 0.85;
  margin-top: 0.125rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: white;
  color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
}

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

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

.btn-icon {
  padding: 0.5rem;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
}

.btn-icon:hover {
  background: var(--bg);
  color: var(--text);
}

.btn-icon.delete:hover {
  background: var(--danger-light);
  color: var(--danger);
}

/* Main */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  flex: 1;
  max-width: 480px;
  box-shadow: var(--shadow);
}

.search-box svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

.search-box input {
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 0.9375rem;
  width: 100%;
  background: transparent;
}

.stats {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* States */
.loading-state,
.error-state,
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

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

.error-icon,
.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.error-state h2,
.empty-state h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.error-state p,
.empty-state p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

/* Books Grid */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.book-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.book-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: #d6cfc4;
}

.book-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.book-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}

.book-actions {
  display: flex;
  gap: 0.25rem;
  flex-shrink: 0;
}

.book-author {
  font-size: 0.9375rem;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 1rem;
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background: var(--primary-light);
  color: var(--primary-hover);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.tag.muted {
  background: var(--bg);
  color: var(--text-muted);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(28, 25, 23, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s ease;
}

.modal-sm {
  max-width: 400px;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.375rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  background: var(--bg);
  color: var(--text);
}

.modal form {
  padding: 1.5rem;
}

.modal-sm {
  padding-bottom: 0;
}

.modal-sm .delete-message {
  padding: 0 1.5rem 1.5rem;
  color: var(--text-muted);
}

.modal-sm .form-actions {
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--border);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--text);
}

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

.form-group input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(180, 83, 9, 0.15);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  padding: 0.875rem 1.25rem;
  background: var(--text);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1100;
  animation: slideIn 0.3s ease;
}

.toast.success {
  background: var(--success);
}

.toast.error {
  background: var(--danger);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .header-content {
    flex-direction: column;
    align-items: stretch;
  }

  .brand {
    justify-content: center;
    text-align: center;
  }

  .header .btn-primary {
    width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .books-grid {
    grid-template-columns: 1fr;
  }
}