:root {
  --bg: #0d0c12;
  --bg-subtle: #12101a;
  --surface: #18161f;
  --surface2: #221f2a;
  --surface-hover: #2a2735;
  --text: #ebe9f0;
  --text-muted: #908ba3;
  --accent: #b794f6;
  --accent-dim: #9f7aea;
  --accent-glow: rgba(183, 148, 246, 0.25);
  --danger: #fc8181;
  --danger-dim: #e53e3e;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.4);
  --font-serif: 'Literata', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: 0.2s ease;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
                    linear-gradient(180deg, var(--bg) 0%, var(--bg-subtle) 100%);
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 720px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 24px 24px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.logo {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.nav {
  display: flex;
  gap: 6px;
}

.nav-link {
  padding: 10px 18px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: color var(--transition), background var(--transition), box-shadow var(--transition);
}

.nav-link:hover {
  color: var(--text);
  background: var(--surface2);
}

.nav-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

.nav-link.active {
  color: var(--accent);
  background: rgba(183, 148, 246, 0.15);
}

.nav-link.active:hover {
  background: rgba(183, 148, 246, 0.22);
}

.main {
  flex: 1;
  padding: 32px 0;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.toolbar {
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: 10px 14px;
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(196, 162, 252, 0.2);
}

.count {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.search-empty {
  margin-top: 24px;
}

.search-empty p {
  margin: 0;
  color: var(--text-muted);
  text-align: center;
}

.book-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.book-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.06);
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition),
              box-shadow var(--transition), transform var(--transition);
  box-shadow: var(--shadow);
}

.book-card:hover {
  border-color: rgba(183, 148, 246, 0.35);
  background: var(--surface2);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.book-card:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.book-cover {
  width: 88px;
  height: 88px;
  min-width: 88px;
  border-radius: 10px;
  object-fit: cover;
  background: var(--surface2);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.book-cover.placeholder {
  background: linear-gradient(145deg, var(--surface2) 0%, var(--accent-dim) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.25rem;
  color: var(--accent);
  opacity: 0.9;
}

.book-info {
  flex: 1;
  min-width: 0;
}

.book-title {
  margin: 0 0 4px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
}

.book-author {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.book-meta {
  margin: 4px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.book-actions {
  display: flex;
  gap: 8px;
}

/* Карточка книги (страница просмотра) */
.back-link {
  display: inline-flex;
  align-items: center;
  margin-bottom: 24px;
  color: var(--text-muted);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.back-link:hover {
  color: var(--accent);
}

.book-detail {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.book-detail-cover {
  width: 200px;
  height: 200px;
  max-width: 100%;
  border-radius: 12px;
  margin-bottom: 24px;
  overflow: hidden;
  background: var(--surface2);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}
.book-detail-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.book-detail-cover.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--accent);
  opacity: 0.9;
  background: linear-gradient(145deg, var(--surface2) 0%, var(--accent-dim) 100%);
}

.book-detail-title {
  margin: 0 0 8px;
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}

.book-detail-author {
  margin: 0 0 12px;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.book-detail-meta {
  margin: 0 0 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.book-detail-description {
  margin-bottom: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre-wrap;
}

.audio-player {
  margin-bottom: 24px;
  padding: 18px 18px 16px;
  border-radius: var(--radius);
  background: var(--surface2);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.audio-player-main {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.player-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: var(--surface);
  color: var(--text);
  transition: background var(--transition), transform 0.1s ease;
}

.player-btn.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  color: var(--bg);
  font-size: 1.1rem;
}

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

.player-btn.primary:hover {
  filter: brightness(1.05);
}

.player-btn:active {
  transform: scale(0.96);
}

.audio-player-info {
  flex: 1;
  min-width: 0;
}

.audio-player-title {
  font-size: 0.95rem;
  margin-bottom: 4px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.audio-player-time {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.audio-player-separator {
  opacity: 0.7;
}

#player-progress {
  width: 100%;
}

.audio-player-tracks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.audio-player-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.audio-player-track:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.audio-player-track.active {
  background: rgba(183, 148, 246, 0.15);
  color: var(--accent);
}

.audio-player-track-index {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  opacity: 0.9;
  margin-right: 6px;
}

.audio-player-track-title {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              box-shadow var(--transition), transform 0.1s ease;
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

.btn:active {
  transform: scale(0.98);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  color: var(--bg);
  font-weight: 500;
}

.btn.primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn.secondary {
  background: var(--surface2);
  color: var(--text);
}

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

.btn.danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

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

.btn.small {
  padding: 8px 14px;
  font-size: 0.82rem;
}

.empty {
  text-align: center;
  padding: 56px 32px;
  color: var(--text-muted);
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px dashed rgba(255, 255, 255, 0.08);
}

.empty-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--surface2) 0%, rgba(183, 148, 246, 0.15) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.empty p {
  margin: 0 0 20px;
  font-size: 1.05rem;
}

.empty .btn {
  margin-top: 4px;
}

.form {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}

.form h2 {
  margin: 0 0 28px;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.form label {
  display: block;
  margin-bottom: 22px;
}

.form label span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.form .file-hint {
  display: block;
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
  opacity: 0.9;
}

.form .file-input {
  padding: 8px 0;
}

.form .edit-file-label .current-file {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.book-detail-file {
  margin-bottom: 20px;
}

.book-detail-files-label {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

#book-detail-downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.form input,
.form textarea {
  width: 100%;
  padding: 14px 18px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--surface2);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form input:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form input::placeholder,
.form textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.85;
}

.form textarea {
  resize: vertical;
  min-height: 100px;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Пакетная загрузка MP3 */
.batch-hint {
  margin: 0 0 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.batch-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.batch-progress {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.batch-progress-text {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.batch-progress-bar {
  height: 8px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 16px;
}

.batch-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-dim));
  border-radius: 4px;
  transition: width 0.2s ease;
}

.batch-errors {
  margin: 0;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--danger);
}

.batch-errors li {
  margin-bottom: 4px;
}

.footer {
  padding: 28px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}

.footer p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Список книг — плавное появление */
.book-list li {
  animation: cardIn 0.35s ease backwards;
}

.book-list li:nth-child(1) { animation-delay: 0.02s; }
.book-list li:nth-child(2) { animation-delay: 0.05s; }
.book-list li:nth-child(3) { animation-delay: 0.08s; }
.book-list li:nth-child(4) { animation-delay: 0.11s; }
.book-list li:nth-child(5) { animation-delay: 0.14s; }
.book-list li:nth-child(n+6) { animation-delay: 0.17s; }

@keyframes cardIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 16px 28px;
  background: var(--surface2);
  border: 1px solid rgba(183, 148, 246, 0.3);
  border-radius: var(--radius);
  font-size: 0.95rem;
  box-shadow: var(--shadow-hover);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s;
  z-index: 100;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Адаптив */
@media (max-width: 560px) {
  #app {
    padding: 0 16px 20px;
  }

  .header {
    flex-wrap: wrap;
    padding: 20px 0;
  }

  .logo {
    font-size: 1.25rem;
  }

  .nav {
    width: 100%;
    justify-content: flex-start;
  }

  .book-card {
    flex-wrap: wrap;
    padding: 16px;
  }

  .book-cover {
    width: 64px;
    height: 64px;
    min-width: 64px;
  }

  .book-cover.placeholder {
    font-size: 1.75rem;
  }

  .book-actions {
    width: 100%;
    justify-content: flex-end;
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
  }

  .form {
    padding: 24px;
  }

  .book-detail {
    padding: 24px;
  }

  .book-detail-cover {
    width: 160px;
    height: 160px;
  }

  .book-detail-cover.placeholder {
    font-size: 3rem;
  }

  .book-detail-title {
    font-size: 1.35rem;
  }
}

/* Страница дубликатов */
.duplicates-toolbar {
  margin-bottom: 24px;
}

.duplicates-title {
  margin: 0 0 8px;
  font-size: 1.35rem;
  color: var(--text);
}

.duplicates-hint {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.duplicates-content {
  margin-bottom: 24px;
  padding: 16px 0;
}

.duplicates-loading,
.duplicates-empty,
.duplicates-error {
  margin: 0;
  color: var(--text-muted);
}

.duplicates-summary {
  margin: 0 0 16px;
  color: var(--text);
}

.duplicates-list {
  margin: 0;
  padding-left: 1.25rem;
  list-style: none;
}

.duplicates-list > li {
  margin-bottom: 16px;
}

.duplicates-group ul {
  margin: 8px 0 0;
  padding-left: 1rem;
  list-style: none;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.duplicate-keep {
  color: var(--accent);
}

.duplicate-remove {
  color: var(--text-muted);
}

.duplicates-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}