/* learn views: lessons (ln-*) and the Tips page. Colours come only from style.css custom properties. */

/* ---------- lesson frame ---------- */
.ln-meta { gap: 8px 12px; margin-top: -8px; }
.ln-lesson { display: flex; flex-direction: column; gap: 22px; min-width: 0; }
.ln-lesson > .prose:first-child h2:first-child { margin-top: 0; }
.ln-figure { max-width: 100%; min-width: 0; }
.ln-figure .caption:empty { display: none; }
.ln-callout-body { display: flex; flex-direction: column; gap: 6px; }
.ln-list { margin: 0; padding-left: 1.2em; display: flex; flex-direction: column; gap: 4px; }
.ln-table td .btn { white-space: nowrap; }
.ln-table td.mono { white-space: nowrap; }
.ln-pattern { font-family: var(--font-display); font-size: 22px; letter-spacing: 0.02em; text-transform: uppercase; }

.ln-practise {
  display: flex; flex-direction: column; gap: 10px;
  border-top: 1px solid var(--line); padding-top: 18px;
}
.ln-practise h2 { font-size: 22px; }
.ln-complete {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px;
}
.ln-complete .btn.primary { max-width: 100%; white-space: normal; text-align: left; }

/* ---------- tempo / misc controls ---------- */
.ln-tempo .row { gap: 8px; flex-wrap: nowrap; }
.ln-tempo output { min-width: 64px; color: var(--fg); font-size: 13px; }

/* ---------- anatomy diagram ---------- */
.ln-anatomy-wrap { overflow-x: auto; }
.ln-anatomy { display: block; width: 100%; min-width: 480px; height: auto; }
.ln-part { transition: fill .15s, stroke .15s, opacity .15s; }
.ln-anatomy [data-part="body"] { fill: var(--surface-2); stroke: var(--muted); stroke-width: 2; }
.ln-anatomy [data-part="headstock"] { fill: var(--board); stroke: var(--board-edge); stroke-width: 1.5; }
.ln-anatomy [data-part="fretboard"] { fill: var(--board); stroke: var(--board-edge); stroke-width: 1.5; }
.ln-anatomy [data-part="nut"] { fill: var(--nut); stroke: var(--muted); stroke-width: 1; }
.ln-anatomy [data-part="tuners"] circle { fill: var(--surface); stroke: var(--fg); stroke-width: 1.5; }
.ln-anatomy [data-part="frets"] line { stroke: var(--fret); stroke-width: 2; }
.ln-anatomy [data-part="inlays"] circle { fill: var(--inlay); opacity: 0.45; }
.ln-anatomy [data-part="pickups"] rect { fill: var(--dot-tone); stroke: var(--line); }
.ln-anatomy [data-part="bridge"] { fill: var(--muted); }
.ln-anatomy [data-part="controls"] circle { fill: var(--surface); stroke: var(--fg); stroke-width: 1.5; }
.ln-anatomy [data-part="strings"] line { stroke: var(--string); }
.ln-anatomy .ln-part.on,
.ln-anatomy .ln-part.on circle,
.ln-anatomy .ln-part.on rect { fill: var(--accent); stroke: var(--accent); opacity: 1; }
.ln-anatomy .ln-part.on line { stroke: var(--accent); stroke-width: 2.6; }
.ln-anatomy [data-part="body"].on { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 3; }
.ln-part-btns { gap: 6px; }
.ln-part-info { min-height: 3.2em; }

/* ---------- chords ---------- */
.ln-tile { font: inherit; }
.ln-tile.on { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.chord-tile.now { border-color: var(--accent); background: var(--accent-soft); }
.ln-root-tile { justify-content: center; min-height: 96px; }
.ln-root-tile strong { font: 800 26px/1 var(--font-display); }
.ln-boxes { align-items: stretch; }
.ln-boxes .chord-tile { min-width: 140px; }
.ln-chord-detail { display: flex; flex-direction: column; gap: 6px; border-top: 1px solid var(--line); padding-top: 12px; }
.ln-chord-name { font: 800 28px/1.05 var(--font-display); text-transform: uppercase; letter-spacing: 0.02em; }
.ln-stack { gap: 6px; }
.ln-stack-gap { font: 600 12px var(--font-mono); color: var(--cool); }
.ln-stack-gap::before { content: '→ '; color: var(--muted); }
.ln-stack-gap::after { content: ' →'; color: var(--muted); }

.ln-trainer { gap: 16px; }
.ln-trainer-display { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 8px 0; }
.ln-bigchord { font: 900 clamp(48px, 12vw, 88px)/0.95 var(--font-display); color: var(--accent); letter-spacing: 0.01em; }
.ln-beats { display: flex; gap: 8px; }
.ln-beats i { width: 14px; height: 14px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--line); }
.ln-beats i:first-child { border-color: var(--accent); }
.ln-beats i.now { background: var(--accent); border-color: var(--accent); }

.ln-nns { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
.ln-nns .field { flex: 1 1 220px; }
.ln-nns input { width: 100%; font-family: var(--font-mono); }
.ln-nns-out { font: 600 18px var(--font-mono); color: var(--accent); overflow-wrap: anywhere; }
.ln-scale-chips .chip { font-size: 13px; }

/* ---------- 12-bar chart & walking bars ---------- */
.ln-twelve { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
.ln-bar {
  position: relative; background: var(--surface-2); border: 1px solid var(--line); border-radius: 8px;
  padding: 18px 8px 10px; text-align: center; min-width: 0; transition: background .1s, border-color .1s;
}
.ln-bar b { font: 700 15px var(--font-mono); }
.ln-bar-n { position: absolute; top: 3px; left: 7px; font: 500 10px var(--font-mono); color: var(--muted); }
.ln-bar.now { background: var(--accent-soft); border-color: var(--accent); }
.ln-bar.now b { color: var(--accent); }
.ln-walk-bars { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); gap: 8px; }
.ln-walk-bars .ln-bar { display: flex; flex-direction: column; gap: 4px; text-align: left; padding: 10px 12px; }
.ln-walk-bars .ln-bar b { font: 800 22px var(--font-display); }
@media (max-width: 480px) { .ln-bar b { font-size: 12px; } }

/* ---------- drum / bass grid (groove lab) ---------- */
.ln-grid-wrap { overflow-x: auto; }
.ln-grid {
  display: grid; grid-template-columns: 56px repeat(16, minmax(16px, 1fr)); gap: 3px;
  align-items: center; min-width: 380px;
}
.ln-grid-label { font: 600 11px var(--font-body); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.ln-grid i { display: block; height: 22px; border-radius: 4px; background: var(--surface-2); border: 1px solid var(--line); }
.ln-grid i.beat { border-color: var(--muted); }
.ln-grid i.hit { background: var(--fg); border-color: var(--fg); }
.ln-grid i.now { outline: 2px solid var(--accent); outline-offset: 1px; }
.ln-grid i.hit.now { background: var(--accent); border-color: var(--accent); }
.ln-grid-count { font: 500 10px var(--font-mono); color: var(--muted); text-align: center; }

/* ---------- rhythm cells ---------- */
.ln-cells { display: grid; grid-template-columns: repeat(16, minmax(0, 1fr)); gap: 4px; }
.ln-cell {
  font: 600 13px var(--font-mono); min-height: 48px; padding: 0; border-radius: 6px; cursor: pointer;
  background: var(--surface); color: var(--muted); border: 1px solid var(--line);
}
.ln-cell.beat { background: var(--surface-2); color: var(--fg); }
.ln-cell.on { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.ln-cell.now { outline: 3px solid var(--accent); outline-offset: 1px; }
.ln-cell.on.now { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
@media (max-width: 560px) {
  .ln-cells { grid-template-columns: repeat(8, minmax(0, 1fr)); }
}

/* ---------- strumming slots ---------- */
.ln-slots { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 6px; }
.ln-slot {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 8px 2px;
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 8px; min-width: 0;
}
.ln-slot b { font: 800 22px/1 var(--font-display); white-space: nowrap; }
.ln-slot-count { font: 500 12px var(--font-mono); color: var(--muted); }
.ln-slot.miss b { color: var(--muted); opacity: 0.6; }
.ln-slot.now { border-color: var(--accent); background: var(--accent-soft); }
.ln-slot.now b { color: var(--accent); }
@media (max-width: 480px) { .ln-slot b { font-size: 16px; } }

/* ---------- tips page ---------- */
.ln-totd {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--accent-soft); border-radius: var(--radius); padding: 18px;
}
.ln-tip {
  display: flex; flex-direction: column; gap: 8px; min-width: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px;
}
.ln-tip p { color: var(--muted); font-size: 15px; }
.ln-tip .ln-tip-link { margin-top: auto; font-size: 14px; font-weight: 600; text-decoration: none; }
.ln-tip .ln-tip-link:hover { text-decoration: underline; }
.ln-tip-featured { background: var(--surface); border-color: var(--accent); }
.ln-tip-featured h2 { font-size: clamp(26px, 5vw, 34px); }
.ln-tip-featured p { color: var(--fg); font-size: 17px; max-width: 62ch; }
.ln-tip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr)); gap: 12px; }
.ln-tips-empty { grid-column: 1 / -1; padding: 24px 0; text-align: center; }
.ln-tips-filters { display: flex; flex-wrap: wrap; gap: 12px 18px; align-items: end; }
.ln-tips-search { flex: 1 1 260px; }
.ln-tips-search input { width: 100%; }
.ln-chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.ln-chip-btn {
  font: 500 13px var(--font-body); padding: 6px 12px; border-radius: 999px; cursor: pointer; min-height: 34px;
  background: var(--surface-2); color: var(--muted); border: 1px solid transparent;
}
.ln-chip-btn:hover { color: var(--fg); border-color: var(--line); }
.ln-chip-btn.on { background: var(--accent); color: var(--accent-ink); }

/* routine */
.ln-routine-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 18px; align-items: start; }
@media (max-width: 720px) { .ln-routine-grid { grid-template-columns: 1fr; } }
.ln-blocks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.ln-block {
  display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg);
}
.ln-block-body { gap: 2px; min-width: 0; }
.ln-block-min { flex: 0 0 52px; font-size: 13px; font-weight: 600; color: var(--accent); padding-top: 2px; }
.ln-block.now { border-color: var(--accent); background: var(--accent-soft); }
.ln-block.done { opacity: 0.6; }
.ln-block.done strong::after { content: ' ✓'; color: var(--good); }
.ln-timer {
  display: flex; flex-direction: column; gap: 12px; align-items: stretch;
  background: var(--surface-2); border-radius: var(--radius); padding: 16px;
}
.ln-timer-label { font-weight: 600; }
.ln-timer-clock { font: 900 clamp(56px, 14vw, 84px)/1 var(--font-display); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }