/* Layout: una sola columna de práctica (pentagrama → respuesta → explicación), con el mapa de notas debajo. */
:root {
  --bg: #FAF9F8;
  --surface: #FFFFFF;
  --line: #E4E2DE;
  --line-strong: #CBC8C3;
  --ink: #121213;
  --ink-2: #585652;
  --ink-3: #7A7772;
  --staff: #3D3B38;
  --brand: #DB0934;
  --brand-hover: #B6072B;
  --on-brand: #FFFFFF;
  --ok: #0F6E56; --ok-bg: #E3F4EE; --ok-text: #0A4C3B;
  --fail: #C2410C; --fail-bg: #FDEDE4; --fail-text: #8A2E08;
  --warm-bg: #FEF4E2; --warm-text: #7A4E04; --warm: #F2A81D;
  --info-bg: #E8EFF8; --info-text: #14355F; --info: #1E4E8C;
  --key-white: #FFFFFF; --key-black: #242322; --key-hit: #E3F4EE;
  --focus: #ED3157;
  --font-display: 'Playfair Display', 'Iowan Old Style', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-music: 'Noto Music', 'Bravura', 'Apple Symbols', 'Segoe UI Symbol', serif;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #121213; --surface: #1B1A1A; --line: #3D3B38; --line-strong: #585652;
  --ink: #FAF9F8; --ink-2: #CBC8C3; --ink-3: #A5A29C; --staff: #CBC8C3;
  --brand: #ED3157; --brand-hover: #F36884; --on-brand: #121213;
  --ok: #5FC2A3; --ok-bg: #0E2A22; --ok-text: #A8E3D0;
  --fail: #F08A5D; --fail-bg: #2E1A10; --fail-text: #F9C4A8;
  --warm-bg: #2C2210; --warm-text: #F5CD7E; --warm: #F2A81D;
  --info-bg: #14223A; --info-text: #B7CBEA; --info: #8DB0E2;
  --key-white: #E4E2DE; --key-black: #030304; --key-hit: #5FC2A3;
  color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #121213; --surface: #1B1A1A; --line: #3D3B38; --line-strong: #585652;
  --ink: #FAF9F8; --ink-2: #CBC8C3; --ink-3: #A5A29C; --staff: #CBC8C3;
  --brand: #ED3157; --brand-hover: #F36884; --on-brand: #121213;
  --ok: #5FC2A3; --ok-bg: #0E2A22; --ok-text: #A8E3D0;
  --fail: #F08A5D; --fail-bg: #2E1A10; --fail-text: #F9C4A8;
  --warm-bg: #2C2210; --warm-text: #F5CD7E; --warm: #F2A81D;
  --info-bg: #14223A; --info-text: #B7CBEA; --info: #8DB0E2;
  --key-white: #E4E2DE; --key-black: #030304; --key-hit: #5FC2A3;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { background: var(--bg); color: var(--ink); font: 400 1rem/1.6 var(--font-sans); padding-inline: 16px; padding-block: 24px 48px; }
.wrap { max-width: 640px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.eyebrow { font: 500 .75rem/1.4 var(--font-sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin: 0; }
h1 { font: 700 2.25rem/1.14 var(--font-display); letter-spacing: -.015em; margin: 4px 0 6px; text-wrap: balance; }
.lead { margin: 0; color: var(--ink-2); max-width: 58ch; }
.bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; }
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 999px; padding: 3px; background: var(--surface); }
.seg button { border: 0; background: transparent; color: var(--ink-2); font: 500 .875rem/1 var(--font-sans); padding: 8px 14px; border-radius: 999px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.ghost { border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-2); font: 500 .8125rem/1 var(--font-sans); padding: 8px 12px; border-radius: 8px; cursor: pointer; }
.ghost:hover { color: var(--ink); border-color: var(--ink-3); }
button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.practice { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 16px 16px; display: flex; flex-direction: column; gap: 14px; }
.practice-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.ask { font: 700 1.125rem/1.4 var(--font-sans); margin: 0; }
.stats { font: 500 .8125rem/1.5 var(--font-sans); color: var(--ink-3); font-variant-numeric: tabular-nums; }
.stats strong { color: var(--ink); font-weight: 700; }
.staff-box { width: 100%; max-width: 100%; }
svg.staff { width: 100%; height: auto; display: block; }
.staff line { stroke: var(--staff); stroke-width: 1.4; }
.staff .clef { fill: var(--staff); font-family: var(--font-music); }
.staff .head { fill: var(--ink); }
.staff .head.ok { fill: var(--ok); }
.staff .head.fail { fill: var(--fail); }
.staff .hole { fill: var(--surface); }
.staff .ghostnote { fill: none; stroke: var(--fail); stroke-width: 2; stroke-dasharray: 4 3; }
.staff .lbl { fill: var(--fail); font: 700 12px var(--font-sans); }
.note-in { animation: slide .28s ease-out; }
@keyframes slide { from { transform: translateX(26px); opacity: .25; } to { transform: none; opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .note-in { animation: none; } }

.answers { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.answers button { font: 700 1rem/1 var(--font-sans); padding: 14px 0; border-radius: 10px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); cursor: pointer; }
.answers button:hover:not(:disabled) { border-color: var(--ink-2); }
.answers button:disabled { cursor: default; opacity: .55; }
.answers button.is-ok { background: var(--ok-bg); border-color: var(--ok); color: var(--ok-text); opacity: 1; }
.answers button.is-fail { background: var(--fail-bg); border-color: var(--fail); color: var(--fail-text); opacity: 1; }
.answers kbd { display: block; font: 500 .6875rem/1 var(--font-sans); color: var(--ink-3); margin-top: 5px; }

.kbd-wrap { overflow-x: auto; }
.piano { position: relative; height: 92px; display: flex; min-width: 300px; user-select: none; }
.piano .w { flex: 1 1 0; border: 1px solid var(--line-strong); border-left-width: 0; background: var(--key-white); border-radius: 0 0 5px 5px; position: relative; cursor: pointer; display: flex; align-items: flex-end; justify-content: center; padding-bottom: 5px; font: 500 .625rem/1 var(--font-sans); color: #7A7772; }
.piano .w:first-child { border-left-width: 1px; }
.piano .w.hit { background: var(--key-hit); }
.piano .w.miss { background: var(--fail-bg); }
.piano .b { position: absolute; top: 0; height: 58%; background: var(--key-black); border-radius: 0 0 4px 4px; z-index: 2; pointer-events: none; }
.hintline { font: 400 .8125rem/1.5 var(--font-sans); color: var(--ink-3); margin: 0; }

.feedback { border-radius: 10px; padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; min-height: 64px; }
.feedback p { margin: 0; }
.feedback .t { font: 700 1rem/1.4 var(--font-sans); }
.feedback.idle { background: transparent; border: 1px dashed var(--line); color: var(--ink-3); }
.feedback.ok { background: var(--ok-bg); color: var(--ok-text); }
.feedback.slow { background: var(--warm-bg); color: var(--warm-text); }
.feedback.fail { background: var(--fail-bg); color: var(--fail-text); }
.feedback.new { background: var(--info-bg); color: var(--info-text); }
.feedback .row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 4px; }
.primary { border: 0; background: var(--brand); color: var(--on-brand); font: 700 .9375rem/1 var(--font-sans); padding: 11px 18px; border-radius: 9px; cursor: pointer; }
.primary:hover { background: var(--brand-hover); }
.feedback small { font: 400 .8125rem/1.4 var(--font-sans); opacity: .85; }

.map { display: flex; flex-direction: column; gap: 10px; }
.map h2 { font: 700 1.125rem/1.4 var(--font-sans); margin: 0; }
.map p { margin: 0; color: var(--ink-2); font-size: .875rem; max-width: 62ch; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; flex-direction: column; gap: 2px; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); min-width: 88px; }
.chip b { font: 700 .9375rem/1.2 var(--font-sans); }
.chip span { font: 500 .6875rem/1.3 var(--font-sans); color: var(--ink-3); }
.chip.secure { background: var(--ok-bg); border-color: transparent; }
.chip.secure b, .chip.secure span { color: var(--ok-text); }
.chip.learning { background: var(--warm-bg); border-color: transparent; }
.chip.learning b, .chip.learning span { color: var(--warm-text); }
.chip.pending { border-style: dashed; }
.chip.pending b { color: var(--ink-3); }
.meter { height: 3px; border-radius: 2px; background: var(--line); overflow: hidden; margin-top: 3px; }
.meter i { display: block; height: 100%; background: currentColor; }
.chip.learning .meter i { background: var(--warm); }
.chip.secure .meter i { background: var(--ok); }

.confirm { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; font-size: .8125rem; color: var(--ink-2); }
footer { font: 400 .75rem/1.5 var(--font-sans); color: var(--ink-3); border-top: 1px solid var(--line); padding-top: 12px; }
@media (max-width: 420px) {
  h1 { font-size: 1.875rem; }
  .answers button { padding: 12px 0; font-size: .9375rem; }
}

/* Cabecera con selector de idioma */
.head-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.langs { display: flex; gap: 2px; }
.langs a { font: 500 .8125rem/1 var(--font-sans); padding: 6px 7px; border-radius: 6px; color: var(--ink-3); text-decoration: none; letter-spacing: .03em; }
.langs a[aria-current] { color: var(--ink); font-weight: 700; }
.langs a:hover { color: var(--ink); }
a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }