.lb-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 1.2rem;
}

.lb-toolbar input[type="search"] { flex: 1 1 240px; }
.lb-toolbar select { flex: 0 1 200px; }

.lb-types {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.lb-types .ad-tab { padding: 0.45rem 0.9rem; font-size: 0.88rem; }

#lb-add { margin-left: auto; }

#lb-form-card { margin-bottom: 1.2rem; }

.lb-wide { grid-column: 1 / -1; }

.ad-main input[type="file"] {
  height: auto;
  padding: 0.55rem 0.7rem;
}

.lb-access .ad-check { margin-bottom: 0.4rem; color: var(--text); }

.lb-access-label {
  margin: 0.8rem 0 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
}

.lb-access-pick.disabled { opacity: 0.4; pointer-events: none; }

.lb-access input[type="search"] { margin-bottom: 0.6rem; }

.lb-student-checks {
  max-height: 200px;
  overflow-y: auto;
  padding: 0.2rem 0;
}

.lb-student-checks small { color: var(--muted); font-size: 0.78rem; }

.lb-access-line {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.lb-access-line.none { color: #e06c6c; }

.lb-form-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.6rem;
}

.lb-grid {
  display: grid;
  gap: 2.4rem;
}

.lb-section {
  display: grid;
  gap: 1.1rem;
}

.lb-section-title {
  font-size: 1.45rem;
  margin: 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.lb-level-title {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.6rem;
}

.lb-count {
  color: var(--muted);
  letter-spacing: normal;
}

/* Folders inside a level */
.lb-folder-body { display: grid; gap: 0.6rem; }
.lb-folder {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
}
.lb-folder > summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
}
.lb-folder > summary::-webkit-details-marker { display: none; }
.lb-folder > summary:hover { background: rgba(201, 164, 92, 0.08); border-radius: 10px; }
.lb-folder-icon::before { content: "📁"; }
.lb-folder[open] > summary .lb-folder-icon::before { content: "📂"; }
.lb-folder-name { color: var(--text); }
.lb-folder .lb-count { font-weight: 400; font-size: 0.85rem; }
.lb-folder-rename { margin-left: auto; font-weight: 400; }
.lb-folder[open] > .lb-folder-body { padding: 0.2rem 0.9rem 0.9rem 1.6rem; border-left: 2px solid rgba(201, 164, 92, 0.25); margin-left: 1.2rem; }

.lb-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.lb-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
}

.lb-item-head {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
}

.lb-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: 1.2rem;
}

.lb-icon img { width: 28px; height: 28px; }

.lb-item h3 {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

.lb-meta {
  margin: 0.15rem 0 0;
  font-size: 0.8rem;
  color: var(--gold);
}

.lb-desc {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.lb-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.4rem;
}

.lb-edit {
  display: flex;
  gap: 0.2rem;
  margin-left: auto;
}

.lb-thumb {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  padding: 0;
  border: 0;
  border-radius: 10px;
  overflow: hidden;
  background: #000;
  cursor: pointer;
}

.lb-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
  transition: opacity 0.2s ease;
}

.lb-thumb:hover img { opacity: 1; }

.lb-thumb span {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 60px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: rgba(204, 0, 0, 0.9);
  color: #fff;
  font-size: 1.2rem;
}

.lb-player {
  width: min(960px, calc(100% - 1.5rem));
  padding: 1.1rem 1.2rem 1.2rem;
}

.lb-player-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.lb-player-head h2 { margin: 0; font-size: 1.2rem; }
.lb-player-head .btn { flex-shrink: 0; white-space: nowrap; }

.lb-player-frame {
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 10px;
  overflow: hidden;
}

.lb-player.is-book .lb-player-frame {
  aspect-ratio: auto;
  height: calc(100svh - 11rem);
  background: #fff;
}

.lb-player-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.lb-player .lb-desc:not(:empty) { margin-top: 0.8rem; }

@media (max-width: 640px) {
  #lb-add { margin-left: 0; }
  .lb-player { padding: 0.8rem; }
}

/* Practice with Engine */
.pr-mini {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  aspect-ratio: 1;
  width: 100%;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}

.pr-mini span { display: grid; place-items: center; aspect-ratio: 1; }
.pr-mini .light { background: #eedbb7; }
.pr-mini .dark { background: #b48a5e; }
.pr-mini img { width: 92%; height: 92%; }

.lb-engine-field textarea {
  width: 100%;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.85rem;
}

.lb-engine-tools { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.5rem 0 0.3rem; }
.lb-file-btn { cursor: pointer; }

.lb-positions {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 0.6rem;
  max-height: 460px;
  overflow-y: auto;
}

.lb-position {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 0.6rem;
  align-items: start;
  padding: 0.5rem;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.1));
  border-radius: 8px;
}

.lb-position-info { display: grid; gap: 0.3rem; min-width: 0; }
.lb-position-info input { width: 100%; }
.lb-position-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.lb-setup-dialog { width: min(440px, calc(100% - 1.5rem)); }
.lb-setup-dialog h2 { margin: 0 0 0.3rem; }
.lb-setup-board { width: min(100%, 360px); margin: 0.6rem auto 0; }
.lb-setup-dialog .cr-editor { width: 100%; margin-top: 0.7rem; }
.lb-setup-dialog .cr-editor-row input { flex: 1; }

.lb-practice { width: min(980px, calc(100% - 1.5rem)); }

.lb-practice-options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.2rem;
  margin: 0.4rem 0 1rem;
}

.lb-practice-options label { display: flex; align-items: center; gap: 0.4rem; }

.lb-practice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.9rem;
}

.lb-practice-card {
  display: grid;
  gap: 0.35rem;
  padding: 0.6rem;
  border-radius: 10px;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.1));
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}

.lb-practice-card:hover,
.lb-practice-card:focus-visible { border-color: var(--gold, #c9a45c); transform: translateY(-2px); }
.lb-practice-card strong { font-size: 0.95rem; }
.lb-practice-card .btn { justify-self: start; }
.lb-practice-options select {
  height: 2.1rem;
  padding: 0 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  font: inherit;
}

.lb-engine-settings { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; margin: 0.8rem 0 0.3rem; }
.lb-engine-settings label { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; font-weight: 500; }
.lb-engine-settings select { width: auto; }