:root {
  color-scheme: dark;
  --bg: #111318;
  --surface: #1a1e26;
  --surface-strong: #222836;
  --surface-soft: #151922;
  --border: #303747;
  --text: #eef2f8;
  --muted: #a8b0c0;
  --muted-strong: #c3cada;
  --accent: #4da3ff;
  --accent-strong: #77baff;
  --danger: #ff6b7a;
  --warning: #f5b84b;
  --success: #55c78a;
  --shadow: 0 18px 50px rgb(0 0 0 / 32%);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgb(255 255 255 / 3%), transparent 220px),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1500px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.app-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.title-block h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  letter-spacing: 0;
}

.title-block p {
  margin: 4px 0 0;
  color: var(--muted);
}

.header-actions,
.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-actions {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  flex-wrap: wrap;
  margin-bottom: 14px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgb(26 30 38 / 94%);
  box-shadow: 0 8px 30px rgb(0 0 0 / 20%);
  backdrop-filter: blur(12px);
}

.field {
  display: grid;
  gap: 5px;
  min-width: 150px;
  color: var(--muted);
  font-size: 0.78rem;
}

.search-field {
  flex: 1 1 280px;
}

.checkbox-field {
  display: flex;
  align-items: center;
  min-width: max-content;
  padding-top: 22px;
}

input[type="search"],
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface-soft);
  color: var(--text);
  outline: none;
}

input[type="search"],
select {
  min-height: 38px;
  padding: 8px 10px;
}

textarea {
  min-height: 76px;
  resize: vertical;
  padding: 9px 10px;
}

input[type="search"]:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgb(77 163 255 / 20%);
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.button,
.link-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface-strong);
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.button {
  padding: 8px 12px;
}

.link-button {
  min-height: 30px;
  padding: 4px 8px;
  font-size: 0.78rem;
}

.button:hover,
.link-button:hover {
  border-color: var(--accent-strong);
}

.button.primary {
  border-color: rgb(77 163 255 / 70%);
  background: linear-gradient(180deg, #2874bd, #215c97);
}

.message {
  min-height: 28px;
  margin-bottom: 8px;
  color: var(--muted-strong);
}

.message.error {
  color: var(--danger);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.book-card {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.book-card[role="link"] {
  cursor: pointer;
}

.book-card[role="link"]:hover,
.book-card[role="link"]:focus {
  border-color: var(--accent-strong);
}

.book-card[role="link"]:focus {
  outline: 2px solid rgb(77 163 255 / 45%);
  outline-offset: 2px;
}

.cover-wrap {
  position: relative;
  aspect-ratio: 4 / 3;
  background:
    radial-gradient(circle at 50% 35%, rgb(255 255 255 / 7%), transparent 44%),
    #0d1016;
}

.cover-wrap.hidden-cover {
  display: none;
}

.cover-wrap img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
}

.cover-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 16px;
  color: var(--muted);
  text-align: center;
  background: linear-gradient(135deg, #222836, #12151c);
}

.favorite-hover-button {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 32px;
  height: 32px;
  border: 1px solid rgb(255 255 255 / 22%);
  border-radius: 50%;
  background: rgb(0 0 0 / 62%);
  color: #d5dae4;
  font-size: 0.95rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-2px);
  transition: opacity 140ms ease, transform 140ms ease;
}

.book-card:hover .favorite-hover-button,
.book-card:focus-within .favorite-hover-button {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.favorite-hover-button.is-active {
  color: #ffd76b;
}

.card-body {
  display: grid;
  gap: 7px;
  padding: 8px;
}

.book-title {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.32;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.meta {
  display: grid;
  gap: 2px;
  color: var(--muted);
  font-size: 0.74rem;
}

.maker-button {
  width: fit-content;
  max-width: 100%;
  overflow: hidden;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--muted);
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.maker-button:hover,
.maker-button:focus {
  color: var(--accent-strong);
  text-decoration: underline;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.tag-badge {
  max-width: 100%;
  overflow: hidden;
  padding: 2px 6px;
  border-radius: 999px;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.68rem;
}

.tag-badge {
  border: 1px solid rgb(255 255 255 / 10%);
  background: #2a3140;
  color: #dce3ef;
}

.empty-state {
  display: none;
  margin: 64px auto;
  max-width: 520px;
  color: var(--muted);
  text-align: center;
}

.empty-state.is-visible {
  display: block;
}

.empty-state h2 {
  margin: 0 0 8px;
  color: var(--text);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 900px) {
  .app-shell {
    padding: 18px;
  }

  .app-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-actions {
    justify-content: flex-start;
  }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(155px, 1fr));
    gap: 12px;
  }
}

@media (max-width: 520px) {
  .app-shell {
    padding: 12px;
  }

  .toolbar {
    position: static;
  }

  .field,
  .search-field {
    flex: 1 1 100%;
    min-width: 0;
  }

  .checkbox-field {
    flex-basis: auto;
    padding-top: 0;
  }

  .books-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .card-body {
    padding: 8px;
  }

  .book-title {
    font-size: 0.82rem;
  }
}