/* ── Color tokens ──────────────────────────────────────────── */
:root {
  --bg:           #f7f6f3;
  --bg-raised:    #ffffff;
  --bg-subtle:    #f3f2ef;
  --bg-hover:     #eae8e2;
  --border:       #e2dfd7;
  --border-input: #ccc9bf;
  --text:         #1a1a1a;
  --text-muted:   #6b7280;
  --text-faint:   #9ca3af;
  --accent:       #2563eb;
  --accent-hover: #1d4ed8;
  --danger:       #dc2626;
  --folder-active: #d97706;  /* amber — "new entries land here" */
  /* aliases used by the shared navbar */
  --surface:      var(--bg-raised);
  --muted:        var(--text-muted);
  --primary:      var(--accent);
  /* app-specific sizing — note: --nav-h (44px) is owned by navbar.js */
  --app-bar-h:    44px;
  --sidebar-w:    240px;
  --cell-r:       8px;
  --font:         system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    ui-monospace, 'Cascadia Code', 'Fira Code', Menlo, monospace;
  color-scheme: light;
}

/* Explicit dark override (set by shared navbar theme toggle) */
:root[data-theme="dark"] {
  --bg:         #0f172a;
  --surface:    #1e293b;
  --primary:    #60a5fa;
  --primary-dk: #3b82f6;
  --text:       #f1f5f9;
  --text-muted: #94a3b8;
  --border:     #334155;
  --border-input: #4a4a47;

  --bg-raised:    #1e293b;
  --bg-subtle:    #33486caa;
  --bg-hover:     #0f172a;
  --border:       #333330;

  --accent:       #60a5fa;
  --accent-hover: #93c5fd;
  --danger:       #f87171;
  color-scheme: dark;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  /* padding-top is set by navbar.js (var(--nav-h) = 44px) */
}

/* ── Menubar ───────────────────────────────────────────────── */
#menubar {
  position: fixed;
  top: var(--nav-h); left: 0; right: 0; /* sits below the 44px site nav */
  height: var(--app-bar-h);
  background: var(--bg-raised);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1rem;
  z-index: 9998; /* just below site nav (9999) */
}

.logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  margin-right: 0.5rem;
  letter-spacing: -0.01em;
}

.menu-section { display: flex; gap: 0.35rem; align-items: center; }
.spacer       { flex: 1; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  padding: 0.2rem 0.7rem;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  font-family: var(--font);
  line-height: 1.4;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: var(--bg-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}
.btn-ghost:hover { background: var(--bg-hover); color: var(--text); }

/* ── Icon buttons (cell toolbar) ───────────────────────────── */
.btn-icon {
  padding: 0.2rem 0.45rem;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font);
  transition: background 0.1s, color 0.1s;
  line-height: 1.3;
  white-space: nowrap;
}
.btn-icon:hover              { background: var(--bg-hover); color: var(--text); }
.btn-icon.active             { background: var(--accent); color: #fff; }
.btn-icon.danger:hover       { background: #fee2e2; color: var(--danger); }
@media (prefers-color-scheme: dark) {
  .btn-icon.danger:hover { background: #3f1515; }
}

/* ── Notebook title ────────────────────────────────────────── */
#title-wrap {
  max-width: 820px;
  margin: calc(var(--app-bar-h) + 2rem) auto 0; /* clear site nav + app bar */
  padding: 0 1.25rem;
}

#notebookTitle {
  font-size: 1.85rem;
  font-weight: 700;
  border: none;
  background: transparent;
  color: var(--text);
  width: 100%;
  outline: none;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s;
  font-family: var(--font);
}
#notebookTitle:focus { border-bottom-color: var(--accent); }
#notebookTitle::placeholder { color: var(--text-faint); }

/* ── Notebook container ────────────────────────────────────── */
#notebook {
  max-width: 820px;
  margin: 1.25rem auto 0;
  padding: 0 1.25rem 5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

/* ── Empty state ───────────────────────────────────────────── */
#empty-state {
  max-width: 820px;
  margin: 3rem auto;
  padding: 2.5rem 1.25rem;
  text-align: center;
  color: var(--text-muted);
  display: none;
}
.empty-icon  { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.4; }
.empty-hint  { margin-top: 0.4rem; font-size: 0.9rem; }

/* ── Cell base ─────────────────────────────────────────────── */
.cell {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--cell-r);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.cell:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}

/* ── Cell toolbar ──────────────────────────────────────────── */
.cell-toolbar {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.35rem 0.5rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  min-height: 34px;
}

.cell-type-tag {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-faint);
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-raised);
  margin-right: 0.25rem;
}

/* ── Text cell ─────────────────────────────────────────────── */
.md-editor {
  width: 100%;
  min-height: 100px;
  padding: 0.85rem 1rem;
  border: none;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 0.87rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-raised);
  outline: none;
  display: block;
}

.md-preview {
  padding: 1rem 1.15rem 0.85rem;
  line-height: 1.75;
  min-height: 40px;
}
.md-preview:empty::before { content: 'Nothing to preview yet.'; color: var(--text-faint); font-style: italic; }

/* Markdown typography */
.md-preview h1 { font-size: 1.55rem; font-weight: 700; margin-bottom: 0.5rem; }
.md-preview h2 { font-size: 1.25rem; font-weight: 700; margin: 1.1rem 0 0.4rem; }
.md-preview h3 { font-size: 1.05rem; font-weight: 600; margin: 0.9rem 0 0.3rem; }
.md-preview p  { margin-bottom: 0.75rem; }
.md-preview p:last-child { margin-bottom: 0; }
.md-preview ul, .md-preview ol { padding-left: 1.4rem; margin-bottom: 0.75rem; }
.md-preview li { margin-bottom: 0.25rem; }
.md-preview code {
  background: var(--bg-subtle);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.86em;
  color: var(--text);
}
.md-preview pre {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 0.75rem;
}
.md-preview pre code { background: none; padding: 0; font-size: 0.85em; }
.md-preview blockquote {
  border-left: 3px solid var(--border-input);
  padding-left: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}
.md-preview a      { color: var(--accent); }
.md-preview strong { font-weight: 600; }
.md-preview hr     { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }
.md-preview table  { border-collapse: collapse; width: 100%; margin-bottom: 0.75rem; font-size: 0.9rem; }
.md-preview th, .md-preview td { border: 1px solid var(--border); padding: 0.4rem 0.65rem; }
.md-preview th { background: var(--bg-subtle); font-weight: 600; }

/* ── Sidebar ──────────────────────────────────────────────── */
#sidebar {
  position: fixed;
  top: calc(var(--nav-h) + var(--app-bar-h));
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--nav-h) - var(--app-bar-h));
  background: var(--bg-raised);
  border-right: 1px solid var(--border);
  overflow: hidden;
  transform: translateX(calc(-1 * var(--sidebar-w)));
  transition: transform 0.22s ease;
  z-index: 9000;
  display: flex;
  flex-direction: column;
}
body.sidebar-open #sidebar { transform: translateX(0); }

#sidebar-header {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}
.sidebar-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  flex: 1;
}
#sidebar-entries { flex: 1; overflow-y: auto; padding: 0.35rem 0; }

.sidebar-entry {
  display: flex;
  align-items: center;
  padding: 0.55rem 0.55rem 0.55rem calc(0.85rem + var(--depth, 0) * 16px);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.1s, border-color 0.1s;
}
.sidebar-entry:hover { background-color: var(--bg-hover); }
.sidebar-entry.active {
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border-left-color: var(--accent);
}
.entry-info { flex: 1; min-width: 0; }
.entry-title {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.entry-meta { font-size: 0.71rem; color: var(--text-faint); margin-top: 0.1rem; }
.sidebar-delete-btn {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-faint);
  cursor: pointer;
  padding: 0.2rem 0.35rem;
  border-radius: 4px;
  font-size: 0.72rem;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s, color 0.1s, background 0.1s;
}
.sidebar-entry:hover .sidebar-delete-btn { opacity: 1; }
.sidebar-delete-btn:hover {
  color: #ef4444;
  background: color-mix(in srgb, #ef4444 12%, transparent);
}

/* Notebook area slides right when sidebar opens */
#notebook-area { transition: margin-left 0.22s ease; }
body.sidebar-open #notebook-area { margin-left: var(--sidebar-w); }

/* Sidebar footer — export / import */
#sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 0.5rem 0.6rem;
  display: flex;
  gap: 0.4rem;
  flex-shrink: 0;
}
#sidebar-footer .btn-sm {
  flex: 1;
  font-size: 0.75rem;
  padding: 0.3rem 0.5rem;
  text-align: center;
  cursor: pointer;
}
#importLabel { display: flex; align-items: center; justify-content: center; }


/* ── Modals ─────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 10001;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-overlay.is-open { display: flex; }

.modal-box {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 100%;
  max-width: 440px;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
}
.modal-box--wide { max-width: 660px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-header h3 { margin: 0; font-size: 1rem; font-weight: 600; color: var(--text); }

.modal-body { flex: 1; overflow-y: auto; padding: 1rem; }

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 0.75rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-footer-option {
  margin-right: auto;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.modal-loading, .modal-empty {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 2.5rem 0;
}
.modal-error {
  color: var(--danger);
  font-size: 0.82rem;
  padding: 0.5rem 0.6rem;
  background: color-mix(in srgb, var(--danger) 8%, transparent);
  border-radius: 6px;
  margin-bottom: 0.75rem;
}

/* ── Settings form ───────────────────────────────────────────── */
.settings-field { margin-bottom: 1rem; }
.settings-field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}
.settings-field input[type="text"],
.settings-field input[type="number"] {
  width: 100%;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font);
  outline: none;
  box-sizing: border-box;
}
.settings-field input[type="text"]:focus,
.settings-field input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 20%, transparent);
}
.settings-field select {
  width: 100%;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font);
  outline: none;
  box-sizing: border-box;
  cursor: pointer;
}
.settings-field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 20%, transparent);
}

/* ── Insert-after dropdown ───────────────────────────────────── */
.cell-insert-wrap { position: relative; }
.cell-insert-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 3px);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem;
  z-index: 500;
  min-width: 100px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  display: none;
  flex-direction: column;
  gap: 0.15rem;
}
.cell-insert-wrap.is-open .cell-insert-dropdown { display: flex; }
.cell-insert-dropdown button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
  border-radius: 4px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.4;
}
.cell-insert-dropdown button:hover { background: var(--bg-hover); }

/* ── Game picker list ────────────────────────────────────────── */
.game-select-all {
  padding: 0.35rem 0.5rem 0.55rem;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.2rem;
}
.game-select-all label { display: flex; align-items: center; gap: 0.4rem; cursor: pointer; }

.game-list { list-style: none; padding: 0; margin: 0; }

.game-row + .game-row { border-top: 1px solid var(--border); }

.game-row label {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  row-gap: 0.15rem;
  padding: 0.55rem 0.4rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.83rem;
}
.game-row label:hover { background: var(--bg-hover); }

.platform-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.1rem 0.32rem;
  border-radius: 3px;
  flex-shrink: 0;
  line-height: 1.6;
}
.platform-lichess  { background: color-mix(in srgb, #699 18%, transparent); color: #2a7070; }
.platform-chesscom { background: color-mix(in srgb, #5a9 18%, transparent); color: #2a6e40; }
@media (prefers-color-scheme: dark) {
  .platform-lichess  { background: #1a3838; color: #55b8b8; }
  .platform-chesscom { background: #1a3828; color: #55b878; }
}

.game-date {
  color: var(--text-muted);
  font-size: 0.77rem;
  font-family: var(--font-mono);
  flex-shrink: 0;
  min-width: 9ch;
}
.game-vs        { flex: 1; min-width: 0; }
.game-vs strong { font-weight: 600; }
.game-result    { font-size: 0.78rem; font-weight: 600; flex-shrink: 0; }
.result-win     { color: #16a34a; }
.result-loss    { color: var(--danger); }
.result-draw    { color: var(--text-muted); }
@media (prefers-color-scheme: dark) { .result-win { color: #4ade80; } }

/* ── Puzzle list ─────────────────────────────────────────────── */
.puzzle-list-body { padding: 0; }
.puzzle-list-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
}
.puzzle-list-row:last-child { border-bottom: none; }
.puzzle-list-info { flex: 1; min-width: 0; }
.puzzle-list-name { display: block; font-weight: 600; font-size: 0.9rem; color: var(--text); }
.puzzle-list-meta { display: block; font-size: 0.76rem; color: var(--text-muted); margin-top: 0.1rem; }
.puzzle-list-actions { display: flex; align-items: center; gap: 0.35rem; flex-shrink: 0; }

/* ── Puzzle practice modal ───────────────────────────────────── */
.modal-box--puzzle { max-width: 420px; }
.puzzle-practice-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.puzzle-board-outer { width: 100%; max-width: 340px; }
.puzzle-board-outer .cg-board { width: 100%; aspect-ratio: 1; }
.puzzle-practice-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 340px;
}
.puzzle-feedback {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  min-height: 1.5em;
  text-align: center;
}
.puzzle-feedback.correct { color: #16a34a; }
@media (prefers-color-scheme: dark) { .puzzle-feedback.correct { color: #4ade80; } }
.puzzle-feedback.wrong   { color: var(--danger); }
.puzzle-btn-row { display: flex; gap: 0.5rem; }

/* hint text in save-puzzle modal */
.puzzle-save-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

/* ── Save puzzle: mode tabs ─────────────────────────────────── */
.puzzle-save-tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
  background: var(--bg-hover);
  border-radius: 6px;
  padding: 0.2rem;
}
.puzzle-save-tab {
  flex: 1;
  background: none;
  border: none;
  border-radius: 5px;
  padding: 0.3rem 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.puzzle-save-tab:hover:not(:disabled) { color: var(--text); }
.puzzle-save-tab.active { background: var(--bg-raised); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.puzzle-save-tab:disabled { opacity: 0.38; cursor: not-allowed; }

/* ── Save puzzle: move list preview ─────────────────────────── */
.puzzle-save-moves-preview {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  line-height: 1.65;
  min-height: 1.5em;
  word-break: break-word;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.15rem 0.1rem;
}
.puzzle-move-num {
  font-size: 0.72rem;
  color: var(--text-faint);
  margin-right: 0.1rem;
  user-select: none;
}
.puzzle-move-chip {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s, color 0.1s;
  line-height: 1.4;
}
.puzzle-move-chip.is-active {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  color: var(--text);
}
.puzzle-move-chip.is-dim {
  color: var(--text-faint);
  border-color: transparent;
}
.puzzle-move-chip:hover { border-color: var(--accent); color: var(--text); }
.puzzle-save-moves-hint {
  width: 100%;
  font-size: 0.72rem;
  color: var(--text-faint);
  font-family: var(--font);
  margin-top: 0.25rem;
}

/* ── Save puzzle: custom board ──────────────────────────────── */
.puzzle-save-board-wrap {
  width: 100%;
  max-width: 260px;
  margin: 0 auto 0.6rem;
}
.puzzle-save-board-wrap .cg-board { width: 100%; aspect-ratio: 1; }
.puzzle-save-custom-footer {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}
.puzzle-save-custom-footer .puzzle-save-moves-preview { flex: 1; display: block; }

.game-speed {
  font-size: 0.75rem;
  color: var(--text-faint);
  flex-shrink: 0;
  text-transform: capitalize;
}
.game-opening {
  width: 100%;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  padding-left: 1.7rem;
  margin-top: -0.05rem;
}

/* ── Sidebar folder tree ──────────────────────────────────────── */

.sidebar-drop-root {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  padding: 0.38rem 0.85rem 0.35rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
  user-select: none;
}
.sidebar-drop-root:hover { background: var(--bg-hover); color: var(--text-muted); }
.sidebar-drop-root.active { color: var(--folder-active); }
.sidebar-drop-root.drag-over {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  outline: 2px dashed color-mix(in srgb, var(--accent) 40%, transparent);
  outline-offset: -2px;
}

.sidebar-folder-row {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.42rem 0.5rem 0.42rem calc(0.65rem + var(--depth, 0) * 16px);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.1s, border-color 0.1s;
  user-select: none;
}
.sidebar-folder-row:hover { background: var(--bg-hover); }
.sidebar-folder-row.active {
  background: color-mix(in srgb, var(--folder-active) 10%, transparent);
  border-left-color: var(--folder-active);
}
.sidebar-folder-row.active .folder-name {
  color: var(--folder-active);
}

.folder-toggle {
  font-size: 0.6rem !important;
  color: var(--text-faint) !important;
  padding: 0.15rem 0.2rem !important;
  flex-shrink: 0;
  line-height: 1;
}
.folder-icon {
  font-size: 0.82rem;
  flex-shrink: 0;
  line-height: 1;
  margin: 0 0.05rem;
}
.folder-name {
  flex: 1;
  min-width: 0;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-menu-wrap { position: relative; flex-shrink: 0; }
.folder-menu-btn { opacity: 0; transition: opacity 0.15s; }
.sidebar-folder-row:hover .folder-menu-btn,
.puzzle-folder-header:hover .folder-menu-btn { opacity: 1; }

.folder-menu-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 2px);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem;
  z-index: 700;
  min-width: 140px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.14);
  display: none;
  flex-direction: column;
  gap: 0.1rem;
}
.folder-menu-wrap.is-open .folder-menu-dropdown { display: flex; }

.folder-action {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.3rem 0.65rem;
  font-size: 0.8rem;
  border-radius: 4px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.4;
}
.folder-action:hover { background: var(--bg-hover); }
.folder-delete { color: var(--danger); }
.folder-delete:hover { background: color-mix(in srgb, var(--danger) 8%, transparent) !important; }

.sidebar-folder-wrap.drag-over > .sidebar-folder-row {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-left-color: var(--accent);
  outline: 2px dashed color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: -2px;
}

/* ── Puzzle folder tree ───────────────────────────────────────── */

.puzzle-folder-section {
  border-bottom: 1px solid var(--border);
}
.puzzle-folder-section:last-child { border-bottom: none; }

.puzzle-folder-header {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 1rem 0.5rem calc(1rem + var(--depth, 0) * 16px);
  cursor: pointer;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
  user-select: none;
}
.puzzle-folder-header:hover { background: var(--bg-hover); }
.puzzle-folder-header.active {
  background: color-mix(in srgb, var(--folder-active) 10%, transparent);
  border-left: 3px solid var(--folder-active);
}
.puzzle-folder-header.active .puzzle-folder-name { color: var(--folder-active); }

.puzzle-folder-toggle { font-size: 0.6rem !important; color: var(--text-faint) !important; flex-shrink: 0; }
.puzzle-folder-icon   { font-size: 0.82rem; flex-shrink: 0; }
.puzzle-folder-name   { flex: 1; font-size: 0.88rem; font-weight: 600; color: var(--text); min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.puzzle-folder-count  {
  font-size: 0.7rem;
  background: var(--bg-hover);
  color: var(--text-muted);
  padding: 0.05rem 0.4rem;
  border-radius: 8px;
  flex-shrink: 0;
}
.puzzle-folder-header .folder-menu-wrap { flex-shrink: 0; }

.puzzle-folder-section.drag-over > .puzzle-folder-header {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  outline: 2px dashed color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: -2px;
}

.puzzle-unfiled-header {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  padding: 0.45rem 1rem 0.35rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
  user-select: none;
}
.puzzle-unfiled-header:hover { background: var(--bg-hover); color: var(--text-muted); }
.puzzle-unfiled-header.active { color: var(--folder-active); }
.puzzle-unfiled-header.drag-over {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  outline: 2px dashed color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: -2px;
}

/* Draggable rows */
.puzzle-list-row[draggable="true"] { cursor: grab; }
.puzzle-list-row[draggable="true"]:active { cursor: grabbing; }

/* Sidebar draggable entries */
.sidebar-entry[draggable="true"] { cursor: grab; }
.sidebar-entry[draggable="true"]:active { cursor: grabbing; }
.sidebar-folder-row[draggable="true"] { cursor: grab; }

/* Puzzles modal header: align new-folder btn before close btn */
#puzzlesModal .modal-header { gap: 0.5rem; }
#puzzlesModal .modal-header h3 { flex: 1; }

/* ── Import / Restore modal ──────────────────────────────────────────────── */
.import-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.import-options {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.import-option {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 0.55rem;
  padding: 0.6rem 0.75rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.1s;
}
.import-option:hover { background: var(--bg-hover); }
.import-option input[type="checkbox"] { flex-shrink: 0; margin: 0; }
.import-option-title { flex: 1; font-weight: 500; min-width: 100px; }
.import-option-count {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-hover);
  border-radius: 10px;
  padding: 0.1rem 0.55rem;
  flex-shrink: 0;
}
.import-option-detail {
  width: 100%;
  padding-left: calc(0.55rem + 1em);  /* align under title */
  font-size: 0.78rem;
  color: var(--text-muted);
}