/* Tools page */

.tool-layout { display: grid; gap: clamp(1.5rem, 4vw, 3rem); grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); align-items: start; }
@media (max-width: 900px) { .tool-layout { grid-template-columns: minmax(0, 1fr); } }
.tool-intro.wide { max-width: 48rem; margin-bottom: 1.5rem; }
.tool-intro p { color: var(--ink-2); }

/* Tuner */
.string-row { display: grid; grid-template-columns: repeat(6, 1fr); gap: .5rem; margin: 1rem 0 1.25rem; }
.string-btn {
  display: grid; gap: .1rem; justify-items: center; padding: .6rem .2rem; cursor: pointer;
  background: var(--surface-2); color: var(--ink); border: 1px solid var(--line); border-radius: var(--r-sm); font: inherit;
}
.string-btn b { font: 700 1.2rem/1 var(--serif); }
.string-btn small { font: .72rem var(--mono); color: var(--ink-3); }
.string-btn:hover, .string-btn.is-target { border-color: var(--accent); }
.string-btn.is-target { background: var(--accent-soft); }
.meter { margin: .5rem 0 1rem; }
.meter-scale { display: flex; justify-content: space-between; font: .75rem var(--mono); color: var(--ink-3); margin-bottom: .25rem; }
.meter-track { position: relative; height: 2.25rem; background: var(--surface-2); border-radius: var(--r-sm); overflow: hidden; }
.meter-zone { position: absolute; left: 45%; width: 10%; top: 0; bottom: 0; background: color-mix(in srgb, var(--ok) 22%, transparent); }
.meter-track::after { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: var(--ink-3); transform: translateX(-1px); }
.meter-needle {
  position: absolute; top: 15%; bottom: 15%; width: 6px; left: 50%; border-radius: 3px; background: var(--ink-3);
  transform: translateX(-3px); transition: left .08s linear, background-color .15s; opacity: .35;
}
.meter-needle.live { opacity: 1; background: var(--accent); }
.meter-needle.in-tune { background: var(--ok); }
.tuner-read { display: grid; grid-template-columns: auto 1fr; gap: 1.25rem; align-items: center; }
.tuner-read .big-num { min-width: 3.5ch; display: inline-block; }
@media (max-width: 520px) { .tuner-read { grid-template-columns: 1fr; } }

/* Metronome */
.bpm-row { display: flex; align-items: center; justify-content: center; gap: 1.25rem; }
.bpm-display { display: grid; justify-items: center; }
.bpm-step { width: 3rem; height: 3rem; font: 600 1.5rem/1 var(--sans); }
.beat-lights { display: flex; gap: .5rem; justify-content: center; margin: 1.25rem 0; min-height: 1.25rem; }
.beat-lights span { width: 1.1rem; height: 1.1rem; border-radius: 50%; background: var(--surface-2); border: 2px solid var(--line-strong); transition: background-color .05s; }
.beat-lights span.accent { border-color: var(--accent); }
.beat-lights span.on { background: var(--accent); border-color: var(--accent); }

/* Drone */
.note-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: .5rem; }
@media (max-width: 420px) { .note-grid { grid-template-columns: repeat(4, 1fr); } }
.note-grid .chip { border-radius: var(--r-sm); min-height: 2.75rem; font-family: var(--serif); font-size: 1.1rem; font-weight: 600; }

/* Fretboard */
.fb-formula { margin: 1rem 0; }
.fb-scroll { overflow-x: auto; padding-bottom: .5rem; }
.fb {
  --frets: 16;
  display: grid; grid-template-columns: 2.25rem repeat(var(--frets), minmax(2.6rem, 1fr));
  min-width: 46rem; position: relative;
}
.fb-label { font: 600 .8rem var(--mono); color: var(--ink-3); display: grid; place-items: center; }
.fb-cell {
  position: relative; height: 2.6rem; display: grid; place-items: center;
  border-right: 2px solid var(--line-strong);
}
.fb-cell::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: var(--sw, 1px); background: var(--ink-3); opacity: .7; }
.fb-cell.open { border-right: 5px solid var(--ink-2); }
.fb-note {
  position: relative; z-index: 1; width: 2rem; height: 2rem; border-radius: 50%; padding: 0; cursor: pointer;
  font: 600 .75rem/1 var(--sans); border: 2px solid transparent; background: transparent; color: transparent;
}
.fb-note:hover { background: var(--surface-2); color: var(--ink-3); border-color: var(--line-strong); }
.fb-note.in { background: var(--surface); color: var(--ink); border-color: var(--accent); }
.fb-note.root { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.fb-note.flash { outline: 3px solid var(--ink); outline-offset: 1px; }
.fb-inlay { height: 1.6rem; display: grid; place-items: center; }
.fb-inlay i { width: .55rem; height: .55rem; border-radius: 50%; background: var(--line-strong); display: inline-block; margin: 0 .15rem; }
.fb-fretnum { font: .72rem var(--mono); color: var(--ink-3); text-align: center; padding-top: .2rem; }

/* Monochord */
#mc-canvas { cursor: ew-resize; aspect-ratio: 720 / 200; }
#mc-canvas:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; }