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

:root {
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #666666;
  --color-primary: cyan;
  --color-primary-hover: #00cccc;
  --color-secondary: #f0f0f0;
  --color-secondary-hover: #e0e0e0;
  --color-star: #f5a623;
  --color-star-inactive: #d4d4d4;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

body {
  font-family: "Comic Sans MS", "Comic Sans", "Comfortaa", "Aclonica" ;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.modal-open {
  overflow: hidden;
}

.header {
  text-align: center;
  padding: 2rem 1.5rem 1rem;
}

.header-compact {
  padding: 1.25rem 1.5rem;
}

.header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
}

.subtitle {
  margin-top: 0.5rem;
  color: var(--color-muted);
}

.back-link {
  display: inline-block;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
}

.back-link:hover {
  text-decoration: underline;
}

.main {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem 2rem;
}

/* Age filter tabs */
.age-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.age-btn {
  font: inherit;
  cursor: pointer;
  border: 2px solid #ddd;
  border-radius: 999px;
  padding: 0.5rem 1rem;
  background: var(--color-secondary);
  color: var(--color-text);
  transition: background-color 0.2s, border-color 0.2s;
}

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

.age-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 700;
}

/* Book grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.book-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease;
}

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

.book-cover-wrap {
  background: #f8f8f8;
  display: flex;
  justify-content: center;
  padding: 1rem;
}

.book-cover {
  width: 140px;
  height: 210px;
  object-fit: cover;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.book-info {
  padding: 1rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.book-title {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.book-author {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-weight: 600;
}

.badge-age {
  background: #e8f4fd;
  color: #1a6fa8;
}

.badge-genre {
  background: #fef3e2;
  color: #b45309;
}

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

/* Buttons */
button,
.btn-primary,
.btn-secondary {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  text-decoration: none;
  text-align: center;
  display: inline-block;
  transition: background-color 0.2s ease;
}

.btn-primary,
.btn-read,
.btn-read-link {
  background-color: var(--color-primary);
  color: black;
  flex: 1;
}

.btn-primary:hover,
.btn-read:hover,
.btn-read-link:hover {
  background-color: var(--color-primary-hover);
}

.btn-secondary,
.btn-review {
  background-color: var(--color-secondary);
  color: var(--color-text);
  flex: 1;
}

.btn-secondary:hover,
.btn-review:hover {
  background-color: var(--color-secondary-hover);
}

button:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible {
  outline: 2px solid #333;
  outline-offset: 2px;
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--color-muted);
  grid-column: 1 / -1;
}

.empty-state h2 {
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.empty-state .btn-primary {
  margin-top: 1rem;
  display: inline-block;
}

/* Book detail page */
.book-detail {
  width: 100%;
}

.detail-layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.detail-cover-wrap {
  display: flex;
  justify-content: center;
}

.detail-cover {
  width: 100%;
  max-width: 280px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.detail-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.25rem;
}

.detail-author {
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.detail-description {
  margin: 1.25rem 0 1.5rem;
  line-height: 1.7;
}

.btn-read-link {
  padding: 0.75rem 1.5rem;
  font-weight: 700;
}

.saved-reviews {
  margin-top: 2rem;
}

.saved-reviews h3 {
  margin-bottom: 1rem;
}

.review-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.review-stars {
  color: var(--color-star);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

.review-card p {
  margin-bottom: 0.35rem;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
}

.modal-dialog {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 2rem;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-muted);
  padding: 0.25rem 0.5rem;
  line-height: 1;
}

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

.modal-dialog h2 {
  margin-bottom: 0.25rem;
}

.modal-book-title {
  color: var(--color-muted);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1.25rem;
  border: none;
}

.form-group label,
.form-group legend {
  display: block;
  font-weight: 700;
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
}

.form-group input[type="date"],
.form-group textarea {
  width: 100%;
  font: inherit;
  padding: 0.6rem 0.75rem;
  border: 2px solid #ddd;
  border-radius: 8px;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Star rating */
.star-rating {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem;
}

.star {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-star-inactive);
  cursor: pointer;
  padding: 0.1rem;
  line-height: 1;
  transition: color 0.15s, transform 0.15s;
}

.star:hover,
.star.active {
  color: var(--color-star);
}

.star:hover {
  transform: scale(1.15);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.form-actions .btn-primary,
.form-actions .btn-secondary {
  flex: 1;
}

.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--color-muted);
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  .detail-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .detail-cover-wrap {
    justify-content: center;
  }

  .book-meta {
    justify-content: center;
  }

  .book-actions {
    flex-direction: column;
  }

  .review-book-header {
    flex-direction: column;
    text-align: center;
  }

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

/* Add book button */
.btn-add-book {
  margin-top: 1rem;
  padding: 0.6rem 1.25rem;
  background: var(--color-primary);
  color: black;
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

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

.book-count {
  text-align: center;
  color: var(--color-muted);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.badge-custom {
  background: #e8fce8;
  color: #166534;
}

.review-badge {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.modal-subtitle {
  color: var(--color-muted);
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}

.modal-dialog-wide {
  max-width: 540px;
}

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

.form-group select,
.form-group input[type="text"],
.form-group input[type="url"] {
  width: 100%;
  font: inherit;
  padding: 0.6rem 0.75rem;
  border: 2px solid #ddd;
  border-radius: 8px;
}

.form-group select:focus,
.form-group input[type="text"]:focus,
.form-group input[type="url"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.text-link {
  color: var(--color-text);
  font-weight: 600;
}

.text-link:hover {
  text-decoration: underline;
}

/* Review page */
.review-page {
  max-width: 720px;
  margin: 0 auto;
}

.review-book-header {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.review-book-cover {
  width: 100px;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}

.review-book-title {
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.review-book-author {
  color: var(--color-muted);
  margin-bottom: 0.75rem;
}

.card-panel {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card-panel h3,
.saved-reviews-section h3 {
  margin-bottom: 1rem;
}

.review-count {
  font-weight: 400;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.empty-reviews {
  color: var(--color-muted);
  font-style: italic;
}

.saved-reviews-section {
  margin-top: 0.5rem;
}

.field-hint {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-top: 0.35rem;
}

.form-group input[type="file"] {
  width: 100%;
  font: inherit;
  padding: 0.4rem 0;
}

.cover-preview-wrap {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.cover-preview {
  width: 120px;
  height: auto;
  max-height: 180px;
  object-fit: cover;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-remove-cover {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border: none;
  border-radius: 6px;
  background: var(--color-secondary);
  cursor: pointer;
}

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

.optional-label {
  font-weight: 400;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.review-by {
  margin-bottom: 0.35rem;
  color: var(--color-text);
}