:root {
  --color-primary: #8b5cf6;
  --color-primary-dark: #7c3aed;
  --color-secondary: #3b82f6;
  --color-accent: #f59e0b;
  --color-background: #ffffff;
  --color-surface: #f9fafb;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-error: #ef4444;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
  --radius: 0.625rem;
  --radius-lg: 0.875rem;
}

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

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.main-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
  min-height: calc(100vh - 200px);
}

.page-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
}

.page-title {
  font-size: 2.5rem;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  font-weight: 700;
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-text-light);
}

.search-container {
  margin-bottom: var(--spacing-md);
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  background-color: var(--color-surface);
  transition: all 0.2s ease;
  font-family: "Poppins", sans-serif;
  color: var(--color-text);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.regex-checkbox-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
}

.regex-checkbox-container label {
  font-size: 0.875rem;
  color: var(--color-text-light);
  cursor: pointer;
}

.form-error {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: 0.875rem;
  color: var(--color-error);
}

.filters {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  flex: 1;
  min-width: 150px;
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--color-text);
}

.form-select {
  width: 100%;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: "Poppins", sans-serif;
  font-size: 1rem;
  background-color: var(--color-surface);
  color: var(--color-text);
  transition: all 0.2s ease;
}

.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.results-count {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
}

.empty-state-title {
  font-size: 1.5rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.empty-state-description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  border: none;
  border-radius: var(--radius);
  font-family: "Poppins", sans-serif;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-primary-dark) 100%
  );
  color: white;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(139, 92, 246, 0.4);
}

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

.btn-secondary:hover {
  background-color: var(--color-background);
  border-color: var(--color-primary);
}

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

.btn-error:hover {
  background-color: #dc2626;
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.books-table-container {
  overflow-x: auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
}

.books-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.books-table thead {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  color: white;
}

.books-table th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.books-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease;
}

.books-table tbody tr:hover {
  background-color: var(--color-background);
}

.books-table tbody tr:last-child {
  border-bottom: none;
}

.books-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  vertical-align: middle;
}

.books-table td strong {
  color: var(--color-text);
  font-weight: 600;
}

.table-notes {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
  font-style: italic;
}

.table-actions {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.btn-icon {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-xs);
  cursor: pointer;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-icon:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  transform: scale(1.1);
}

.btn-icon-danger:hover {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: white;
}

.books-cards-container {
  margin-bottom: var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

.book-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.book-cover {
  width: 100%;
  height: 200px;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 3rem;
}

.book-status {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
}

.book-status.read {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.book-status.reading {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--color-accent);
}

.book-status.to-read {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--color-secondary);
}

.book-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.book-author {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.book-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

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

.book-actions {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: auto;
}

.star-rating {
  display: flex;
  gap: 2px;
}

.star-icon {
  width: 14px;
  height: 14px;
  fill: var(--color-accent);
  stroke: var(--color-accent);
}

.sort-btn {
  background: none;
  border: none;
  font-size: 0.75rem;
  color: var(--color-text);
  padding: 0 0.25rem;
  cursor: pointer;
  vertical-align: middle;
  transition: color 0.2s ease;
}

.sort-btn:hover,
.sort-btn:focus {
  color: var(--color-primary);
  outline: none;
}

.sort-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.books-table th {
  position: relative;
  padding-right: 1.5rem;
}

.books-table th button {
  position: absolute;
  right: 0.25rem;
  top: 50%;
  transform: translateY(-50%);
}

/* Responsive Design */
@media (min-width: 1024px) {
  .books-table-container {
    display: block;
  }
  .books-cards-container {
    display: none;
  }
}

@media (max-width: 1023px) {
  .books-table-container {
    display: none;
  }
  .books-cards-container {
    display: block;
  }
}