.button {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: var(--space-8) var(--space-16);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.button-primary { background: var(--text-primary); color: var(--bg-page); }
.button-primary:hover { background: #fff; color: #000; }
.button-secondary { border-color: var(--border-strong); background: var(--bg-surface); color: var(--text-primary); }
.button-secondary:hover { background: var(--bg-surface-hover); }
.button-danger { border-color: rgba(200, 91, 91, 0.45); background: transparent; color: #df7777; }
.button-text { min-height: auto; border: 0; background: transparent; padding: var(--space-4) 0; color: var(--text-secondary); }
.button-text:hover, .text-link:hover { color: var(--text-primary); }
.button-icon { width: 2.75rem; padding: 0; }
.button:disabled { background: var(--border-subtle); color: var(--text-disabled); cursor: not-allowed; }
.button.is-loading { pointer-events: none; }
.text-link { border: 0; background: transparent; color: var(--text-secondary); font-size: var(--text-sm); cursor: pointer; }

.surface { border: 1px solid var(--border-default); border-radius: var(--radius); background: var(--bg-surface); }
.feature { padding: var(--space-32); }

.book-cover-link { display: block; }
.book-cover-wrap { position: relative; display: block; overflow: hidden; border-radius: var(--radius-sm); background: var(--bg-elevated); }
.book-cover { width: 100%; height: 100%; object-fit: cover; }
.book-cover-fallback { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-8); background: #202020; padding: var(--space-16); color: var(--text-primary); font-family: var(--font-editorial); text-align: center; }
.book-cover-fallback[hidden] { display: none; }
.book-cover-fallback::before { content: ''; position: absolute; inset: var(--space-8); border: 1px solid var(--border-strong); }
.book-cover-fallback strong, .book-cover-fallback span { position: relative; }
.book-cover-fallback span { color: var(--text-secondary); font-family: var(--font-ui); font-size: var(--text-xs); }

.progress-meta { display: flex; justify-content: space-between; gap: var(--space-16); color: var(--text-secondary); font-size: var(--text-sm); }
.progress-track { height: 0.375rem; overflow: hidden; border-radius: var(--radius-sm); background: var(--border-default); }
.progress-value { height: 100%; background: var(--text-primary); transition: width var(--transition); }

.stats-section { border-top: 1px solid var(--border-default); padding-top: var(--space-24); }
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-24); }
.stat strong { display: block; font-size: var(--text-2xl); line-height: 1.1; letter-spacing: -0.02em; }
.stat span { display: block; margin-top: var(--space-4); color: var(--text-secondary); font-size: var(--text-sm); }

.filter-tabs { display: flex; gap: var(--space-8); overflow-x: auto; padding-bottom: var(--space-4); scrollbar-width: none; }
.filter-tabs::-webkit-scrollbar { display: none; }
.filter-tab { flex: 0 0 auto; min-height: 2.5rem; border: 1px solid transparent; border-radius: var(--radius); background: transparent; padding: var(--space-8) var(--space-12); color: var(--text-secondary); font-size: var(--text-sm); cursor: pointer; }
.filter-tab:hover { background: var(--bg-surface); color: var(--text-primary); }
.filter-tab.active { border-color: var(--border-default); background: var(--bg-elevated); color: var(--text-primary); font-weight: 600; }

.book-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); column-gap: var(--space-24); row-gap: var(--space-48); }
.book-card { position: relative; min-width: 0; }
.book-card .book-cover-wrap { aspect-ratio: 2 / 3; margin-bottom: var(--space-12); }
.book-card .book-title { display: -webkit-box; overflow: hidden; color: var(--text-primary); font-family: var(--font-editorial); font-size: var(--text-lg); font-weight: 600; line-height: 1.25; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.book-card .book-title:hover { text-decoration: underline; text-underline-offset: 0.2em; }
.book-card .book-author { display: -webkit-box; overflow: hidden; margin-top: var(--space-4); color: var(--text-secondary); font-size: var(--text-sm); line-height: 1.35; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.book-card .book-status { display: inline-flex; width: max-content; max-width: 100%; align-items: center; border: 1px solid var(--border-default); border-radius: var(--radius-sm); padding: var(--space-4) var(--space-8); line-height: 1.2; }
.book-status { margin-top: var(--space-8); color: var(--text-muted); font-size: var(--text-xs); }
.book-card-tags { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-top: var(--space-8); }
.book-card-tags .book-status { margin-top: 0; }
.context-trigger { position: absolute; top: var(--space-8); right: var(--space-8); z-index: 2; width: 2.5rem; height: 2.5rem; border: 1px solid var(--border-default); border-radius: var(--radius); background: var(--bg-page); color: var(--text-primary); cursor: pointer; opacity: 0; transition: opacity var(--transition), background var(--transition); }
.book-card:hover .context-trigger, .context-trigger:focus { opacity: 1; }
.context-menu { position: fixed; z-index: 80; width: 12.5rem; border: 1px solid var(--border-default); border-radius: var(--radius); background: var(--bg-elevated); padding: var(--space-8); box-shadow: 0 1rem 2.5rem rgba(0, 0, 0, .45); }
.context-menu button, .context-menu a { display: flex; width: 100%; min-height: 2.5rem; align-items: center; border-radius: var(--radius-sm); background: transparent; padding: var(--space-8) var(--space-12); color: var(--text-secondary); font-size: var(--text-sm); cursor: pointer; }
.context-menu button:hover, .context-menu a:hover { background: var(--bg-surface-hover); color: var(--text-primary); }
.context-menu .danger { color: #df7777; }

.carousel-shell { position: relative; }
.carousel { display: grid; grid-auto-flow: column; grid-auto-columns: calc((100% - 4.5rem) / 4); gap: var(--space-24); overflow-x: auto; scroll-behavior: smooth; scroll-snap-type: x mandatory; scrollbar-width: none; }
.carousel::-webkit-scrollbar { display: none; }
.carousel > * { scroll-snap-align: start; }
.carousel-controls { display: flex; gap: var(--space-8); margin-top: var(--space-16); justify-content: flex-end; }

.form-group { display: grid; gap: var(--space-8); }
.form-group + .form-group { margin-top: var(--space-16); }
.form-group label, .form-label { color: var(--text-secondary); font-size: var(--text-sm); font-weight: 500; }
.input, .select, .textarea {
  width: 100%;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  background: var(--bg-page);
  color: var(--text-primary);
  padding: var(--space-12) var(--space-16);
}
.input, .select { height: 2.75rem; }
.select-control { position: relative; display: block; }
.select-control .select { appearance: none; padding-right: var(--space-48); }
.select-control svg { position: absolute; top: 50%; right: var(--space-16); width: 1rem; height: 1rem; color: var(--text-secondary); pointer-events: none; transform: translateY(-50%); }
.textarea { min-height: 7rem; resize: vertical; }
.input:hover, .select:hover, .textarea:hover { border-color: var(--border-strong); }
.field-help { color: var(--text-muted); font-size: var(--text-xs); }
.field-error { color: #df7777; font-size: var(--text-xs); }
.form-actions { display: flex; justify-content: flex-end; gap: var(--space-12); margin-top: var(--space-24); }
.list-book-picker { border: 0; margin: var(--space-24) 0 0; padding: 0; }
.list-book-picker legend { color: var(--text-secondary); font-size: var(--text-sm); font-weight: 500; }
.list-book-picker > p { margin-top: var(--space-4); color: var(--text-muted); font-size: var(--text-xs); }
.list-picker-search { position: relative; margin-top: var(--space-12); }
.list-picker-search svg { position: absolute; top: 50%; left: var(--space-16); width: 1rem; height: 1rem; color: var(--text-muted); pointer-events: none; transform: translateY(-50%); }
.list-picker-search .input { padding-left: var(--space-48); }
.list-book-options { display: grid; max-height: 20rem; overflow-y: auto; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-8); margin-top: var(--space-12); }
.list-book-option { display: grid; min-width: 0; grid-template-columns: auto 2.25rem minmax(0, 1fr); gap: var(--space-8); align-items: center; border: 1px solid var(--border-subtle); border-radius: var(--radius-sm); padding: var(--space-8); cursor: pointer; }
.list-book-option[hidden] { display: none; }
.list-book-option:has(input:checked) { border-color: var(--border-strong); background: var(--bg-surface-hover); }
.list-book-option input { width: 1rem; height: 1rem; accent-color: var(--text-primary); }
.list-book-option .book-cover-wrap { width: 2.25rem; aspect-ratio: 2 / 3; }
.list-book-option strong, .list-book-option small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.list-book-option strong { font-size: var(--text-sm); }
.list-book-option small { color: var(--text-muted); }
.list-picker-empty { margin-top: var(--space-12); border-top: 1px solid var(--border-subtle); padding: var(--space-24) 0; color: var(--text-muted); font-size: var(--text-sm); text-align: center; }

.modal-backdrop { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; overflow-y: auto; background: rgba(0, 0, 0, 0.76); padding: var(--space-24); }
.modal-backdrop[hidden] { display: none; }
.modal { width: min(100%, 34rem); max-height: calc(100vh - var(--space-48)); overflow-y: auto; border: 1px solid var(--border-strong); border-radius: var(--radius); background: var(--bg-elevated); box-shadow: 0 1.5rem 4rem rgba(0,0,0,.6); }
.modal-wide { width: min(100%, 48rem); }
.modal-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-16); border-bottom: 1px solid var(--border-default); padding: var(--space-16) var(--space-24); }
.modal-header h2 { font-size: var(--text-xl); }
.modal-close { display: grid; width: 2.75rem; height: 2.75rem; flex: 0 0 2.75rem; place-items: center; border-radius: var(--radius); background: transparent; padding: 0; color: var(--text-secondary); line-height: 0; cursor: pointer; }
.modal-close svg { display: block; margin: 0; }
.modal-close:hover { background: var(--bg-surface-hover); color: var(--text-primary); }
.modal-body { padding: var(--space-24); }

.toast-region { position: fixed; right: var(--space-24); bottom: var(--space-24); z-index: 130; display: grid; gap: var(--space-8); width: min(22rem, calc(100vw - var(--space-32))); }
.toast { border: 1px solid var(--border-default); border-radius: var(--radius-sm); background: var(--bg-elevated); color: var(--text-primary); padding: var(--space-12) var(--space-16); font-size: var(--text-sm); font-weight: 400; box-shadow: 0 .5rem 1.5rem rgba(0,0,0,.28); animation: toast-in var(--transition); }
@keyframes toast-in { from { opacity: 0; transform: translateY(.5rem); } }

.accordion { border-top: 1px solid var(--border-default); }
.accordion:last-child { border-bottom: 1px solid var(--border-default); }
.accordion-trigger { display: flex; width: 100%; min-height: 3.75rem; align-items: center; justify-content: space-between; gap: var(--space-16); background: transparent; padding: var(--space-12) 0; color: var(--text-primary); text-align: left; cursor: pointer; }
.accordion-trigger svg { flex: 0 0 auto; transition: transform var(--transition); }
.accordion-trigger[aria-expanded='true'] svg { transform: rotate(180deg); }
.accordion-panel { padding: 0 0 var(--space-24); color: var(--text-secondary); }
.accordion-panel[hidden] { display: none; }

.empty-state { border-top: 1px solid var(--border-default); padding: var(--space-32) 0; }
.empty-state p { margin-bottom: var(--space-16); color: var(--text-secondary); }

.skeleton { position: relative; overflow: hidden; background: var(--bg-elevated); }
.skeleton { animation: skeleton 1.2s ease-in-out infinite alternate; }
.skeleton-grid { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: var(--space-48) var(--space-24); }
.skeleton-book { display: grid; gap: var(--space-12); }
.skeleton-cover { display: block; aspect-ratio: 2 / 3; border-radius: var(--radius-sm); }
.skeleton-line { display: block; width: 88%; height: .875rem; border-radius: var(--radius-sm); }
.skeleton-line-short { width: 58%; }
.loading-state { display: flex; min-height: 7rem; align-items: center; justify-content: center; gap: var(--space-12); color: var(--text-secondary); font-size: var(--text-sm); }
.loading-spinner { display: inline-block; width: 1rem; height: 1rem; flex: 0 0 1rem; border: 2px solid var(--border-strong); border-top-color: currentColor; border-radius: 50%; animation: loading-spin .7s linear infinite; }
.search-loading { display: flex; align-items: center; gap: var(--space-12); border-bottom: 1px solid var(--border-subtle); padding: var(--space-16) 0; color: var(--text-secondary); font-size: var(--text-sm); }
@keyframes skeleton { to { opacity: .58; } }
@keyframes loading-spin { to { transform: rotate(360deg); } }

.rating { display: flex; gap: var(--space-4); }
.rating button { width: 2.5rem; height: 2.5rem; background: transparent; color: var(--text-disabled); font-size: var(--text-xl); cursor: pointer; }
.rating button.active, .rating button:hover { color: var(--text-primary); }