/* Fiddle Tune Trainer — shares the visual language of index.html
   (same paper/ink palette, serif type, hairline rules, editorial feel). */

:root {
  --paper: #f7f2e7;
  --paper-deep: #efe8d8;
  --ink: #2a2520;
  --ink-soft: #6b6358;
  --ink-faint: #968d7e;
  --rule: #c9bfae;
  --hover: rgba(42, 37, 32, 0.04);
  --good: #1f4d3e;          /* theatre green from the site palette */
  --good-bg: #d2e8dc;
  --bad: #8b3a2e;
  --bad-bg: #f0dcd5;
  --bad-rule: #d8a99e;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --serif: "Iowan Old Style", "Hoefler Text", "Palatino", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.container {
  max-width: 48rem;
  margin: 0 auto;
  padding: 3rem 1.75rem 4rem;
}

/* Cross-page navigation (shared with index.html) */
.site-nav {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.1rem;
  color: var(--ink-faint);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  row-gap: 0.4rem;
}
.site-nav a { color: var(--ink-faint); text-decoration: none; }
.site-nav a:hover { color: var(--ink); }
.site-nav a.active {
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
}
.site-nav .sep { margin: 0 0.55rem; color: var(--rule); }
.nav-menu { position: relative; }
.nav-menu summary {
  list-style: none;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}
.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu summary::after {
  content: "\25BE";
  margin-left: 0.35em;
  font-size: 0.85em;
}
.nav-menu summary:hover, .nav-menu[open] summary { color: var(--ink); }
.nav-menu summary.active {
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
}
.nav-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: -0.65rem;
  z-index: 30;
  background: var(--paper);
  border: 0.5px solid var(--rule);
  border-radius: 6px;
  padding: 0.35rem 0;
  white-space: nowrap;
}
.nav-panel a { display: block; padding: 0.3rem 0.95rem; }
.nav-panel a.active {
  border-bottom: none;
  padding-bottom: 0.3rem;
  background: var(--paper-deep);
  color: var(--ink);
}

/* Header */
.site-header {
  margin-bottom: 1.75rem;
  padding-bottom: 1.4rem;
  border-bottom: 0.5px solid var(--rule);
}
.site-header h1 {
  font-size: 2.6rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  margin: 0 0 0.3rem;
  line-height: 1.1;
}
.site-header .tag {
  font-style: italic;
  color: var(--ink-soft);
  margin: 0;
  font-size: 1.05rem;
}

/* Progress / mastery row */
.progress {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.progress .label {
  font-family: var(--sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  white-space: nowrap;
}
.mastery-marks {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  line-height: 1.7;
  word-break: break-word;
}
.mastery-marks .done { color: var(--ink); }
.mastery-marks .todo { color: var(--ink-faint); opacity: 0.55; }

/* Stage — the sheet-music prompt */
.stage {
  position: relative;
  background: var(--paper);
  border: 0.5px solid var(--rule);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  min-height: 8rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Play control — appears only when a tune has an audio clip on disk. Understated
   hairline circle in the card corner; tap to play (never autoplays, so iOS is
   happy). Toggles to a pause glyph and green while sounding. */
.play-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: var(--paper);
  border: 0.5px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
}
.play-btn svg { width: 0.85rem; height: 0.85rem; fill: currentColor; }
.play-btn .ic-pause { display: none; }
.play-btn.playing { color: var(--good); border-color: var(--good); }
.play-btn.playing .ic-play { display: none; }
.play-btn.playing .ic-pause { display: inline; }
@media (hover: hover) and (pointer: fine) {
  .play-btn:hover { color: var(--ink); border-color: var(--ink); background: var(--paper-deep); }
}
.stage img {
  max-width: 100%;
  height: auto;
  /* Sheet music reads as ink on paper; a hair of contrast against the card. */
  mix-blend-mode: multiply;
}
.stage .prompt-name {
  font-size: 1.6rem;
  text-align: center;
}

/* Answer options — laid out like a numeric keypad: 4 5 6 / 1 2 3 */
.options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}
.option:nth-child(1) { grid-area: 2 / 1; }
.option:nth-child(2) { grid-area: 2 / 2; }
.option:nth-child(3) { grid-area: 2 / 3; }
.option:nth-child(4) { grid-area: 1 / 1; }
.option:nth-child(5) { grid-area: 1 / 2; }
.option:nth-child(6) { grid-area: 1 / 3; }
.option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 3.4rem;
  padding: 0.6rem 0.8rem;
  background: var(--paper);
  border: 0.5px solid var(--rule);
  border-radius: 6px;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
/* Hover only where a real pointer exists. On touch, tapping applies a sticky
   :hover that would otherwise linger on whatever option lands in the same grid
   slot after an auto-advance — reading as a preselected answer. */
@media (hover: hover) and (pointer: fine) {
  .option:hover:not(:disabled) { background: var(--paper-deep); }
}
.option:disabled { cursor: default; }
.option .num {
  flex: 0 0 auto;
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-faint);
  width: 1.15rem;
  text-align: center;
}
.option.correct {
  background: var(--good-bg);
  border-color: var(--good);
  color: var(--good);
}
.option.correct .num { color: var(--good); }
.option.wrong {
  background: var(--bad-bg);
  border-color: var(--bad-rule);
  color: var(--bad);
}
.option.wrong .num { color: var(--bad); }

/* The correct answer doubles as the "advance" control: it stays live after you
   answer, keeps its green, and shows a › at its right edge. Tap it (or press its
   number / Enter) to move on. Placed after the :hover rule so it wins on hover. */
.option.advance { cursor: pointer; }
@media (hover: hover) and (pointer: fine) {
  .option.advance:hover { background: var(--good-bg); border-color: var(--good); }
}
.advance-cue {
  margin-left: auto;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--good);
}

/* Feedback + controls */
.feedback {
  text-align: center;
  font-style: italic;
  font-size: 1.1rem;
  min-height: 1.6em;
  margin-bottom: 0.5rem;
}
.feedback.right { color: var(--good); }
.feedback.wrong { color: var(--bad); }

/* Keypad diagram + hint, shown above the rule. The diagram mirrors the on-screen
   option layout (4 5 6 / 1 2 3) so the number-key mapping reads at a glance. */
.keypad-hint {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: 1.25rem;
}
.keypad {
  flex: 0 0 auto;
  width: 80px;
  height: 92px;
}
.keypad .key {
  fill: var(--paper);
  stroke: var(--rule);
  stroke-width: 1;
}
.keypad .key.on { fill: var(--paper-deep); stroke: var(--ink); }
.keypad .lbl {
  font-family: var(--sans);
  font-size: 11px;
  fill: var(--ink-faint);
  text-anchor: middle;
  dominant-baseline: central;
}
.keypad .lbl.on { fill: var(--ink); font-weight: 700; }
.keypad .lbl.enter { font-size: 13px; }

.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-top: 0.5px solid var(--rule);
  padding-top: 1rem;
}
.hint {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-faint);
  line-height: 1.5;
  margin: 0;
}

/* Auto-advance preference — small --sans utility control, off by default. */
.autoadv {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-soft);
}
.autoadv-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  white-space: nowrap;
}
.autoadv-toggle input { accent-color: var(--ink); }
.autoadv-delay {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: opacity 0.12s;
}
.autoadv-delay input[type="range"] { width: 6rem; accent-color: var(--ink); }
.autoadv-val {
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  min-width: 2.3rem;
}
.autoadv.off .autoadv-delay { opacity: 0.4; }
.link-btn {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  cursor: pointer;
  white-space: nowrap;
}
.link-btn:hover { color: var(--ink); text-decoration-color: var(--ink); }

.loading, .error {
  padding: 2.5rem 1rem;
  text-align: center;
  color: var(--ink-faint);
  font-style: italic;
  border: 0.5px dashed var(--rule);
  border-radius: 6px;
}
.error { color: var(--bad); border-color: var(--bad-rule); }

@media (max-width: 720px) {
  .container { padding: 2rem 1.25rem 3rem; }
  .site-header h1 { font-size: 2.1rem; }
  .option { font-size: 0.9rem; min-height: 3.8rem; }
}