/* ============================================================
   components.css — botones, tarjetas, piano, pentagrama, juegos
   ============================================================ */

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  color: var(--ink);
  font-weight: 600;
  transition: transform .12s var(--ease), background .18s, border-color .18s, box-shadow .18s;
  white-space: nowrap;
}
.btn:hover { background: var(--panel-3); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, var(--brass-strong), var(--brass));
  color: var(--accent-ink);
  border-color: transparent;
  box-shadow: 0 8px 20px -10px color-mix(in srgb, var(--brass) 70%, transparent);
}
.btn.primary:hover { filter: brightness(1.05); background: linear-gradient(180deg, var(--brass-strong), var(--brass)); }
.btn.ghost { background: transparent; }
.btn.ghost:hover { background: var(--panel-2); }
.btn.sm { padding: 7px 11px; font-size: 13px; }
.btn.lg { padding: 13px 22px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  font-size: 18px;
  transition: background .18s, transform .12s;
}
.icon-btn:hover { background: var(--panel-3); }
.icon-btn:active { transform: translateY(1px); }

.select {
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--panel-2);
}
.range { width: 100%; accent-color: var(--accent); }

.midi-btn .dot { width: 8px; height: 8px; border-radius: 99px; background: var(--ink-mute); box-shadow: 0 0 0 0 transparent; transition: .2s; }
.midi-btn.on .dot { background: var(--good); box-shadow: 0 0 10px 1px color-mix(in srgb, var(--good) 70%, transparent); }

/* ---------- Encabezado de módulo ---------- */
.mod-head { margin-bottom: 22px; }
.mod-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent);
  padding: 5px 10px; border-radius: 99px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
}
.mod-title { font-size: clamp(24px, 4vw, 34px); margin: 14px 0 6px; }
.mod-sub { color: var(--ink-soft); max-width: 62ch; }

/* ---------- Tarjetas / paneles ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-soft);
}
.card.pad-lg { padding: 26px; }
.card-title { display: flex; align-items: center; gap: 10px; font-size: 16px; margin-bottom: 6px; }
.card-title .ico { font-size: 20px; }

.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) { .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; } }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.toolbar .spacer { flex: 1; }

.pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 12px; border-radius: 99px;
  border: 1px solid var(--line-strong);
  background: var(--panel-2);
  font-size: 13px; font-weight: 600;
}
.pill.good { color: var(--good); border-color: color-mix(in srgb, var(--good) 45%, transparent); background: color-mix(in srgb, var(--good) 12%, transparent); }
.pill.bad { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 45%, transparent); background: color-mix(in srgb, var(--bad) 12%, transparent); }

.kpi { display: flex; flex-direction: column; gap: 2px; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--panel-2); border: 1px solid var(--line); }
.kpi .k-val { font-size: 26px; font-weight: 800; font-variant-numeric: tabular-nums; }
.kpi .k-lab { font-size: 12px; color: var(--ink-mute); text-transform: uppercase; letter-spacing: .08em; }
.kpi.accent .k-val { color: var(--accent); }
.kpi.good .k-val { color: var(--good); }

/* ---------- Segmentado / pestañas ---------- */
.segmented { display: inline-flex; padding: 4px; gap: 4px; background: var(--panel-2); border: 1px solid var(--line); border-radius: 12px; }
.segmented button {
  padding: 8px 15px; border: 0; border-radius: 9px; background: transparent; color: var(--ink-soft); font-weight: 600;
  transition: background .16s, color .16s;
}
.segmented button.active { background: var(--panel); color: var(--ink); box-shadow: var(--shadow-soft); }

/* Selector de opciones tipo chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 14px; border-radius: 99px; border: 1px solid var(--line-strong);
  background: var(--panel-2); color: var(--ink-soft); font-weight: 600;
  transition: .15s;
}
.chip:hover { color: var(--ink); border-color: var(--accent); }
.chip.active { background: var(--accent); color: var(--accent-ink); border-color: transparent; }

/* ============================================================
   PIANO (teclado interactivo reutilizable)
   ============================================================ */
.piano-wrap { overflow-x: auto; overflow-y: hidden; padding: 10px 4px 16px; -webkit-overflow-scrolling: touch; }
.piano {
  position: relative;
  display: block;
  height: var(--pk-h, 190px);
  padding: 14px 14px 16px;
  border-radius: 16px;
  background: linear-gradient(180deg, #0f0c0a, #211a15);
  border: 1px solid var(--line-strong);
  box-shadow: inset 0 2px 0 rgba(255,255,255,.05), var(--shadow);
  user-select: none;
  touch-action: none;
  width: max-content;
}
.keybed { position: relative; display: flex; height: 100%; width: max-content; }
/* fieltro rojo bajo las teclas */
.piano::before {
  content: ""; position: absolute; left: 0; right: 0; top: 6px; height: 5px;
  background: linear-gradient(90deg, #6d1f22, #a23036, #6d1f22);
  border-radius: 4px 4px 0 0; opacity: .85;
}
.pkey {
  position: relative;
  display: flex; align-items: flex-end; justify-content: center;
  padding-bottom: 9px;
  transition: background .05s, transform .04s;
  cursor: pointer;
}
.pkey.white {
  width: var(--wkw, 42px);
  height: 100%;
  background: linear-gradient(180deg, #fffdf8, var(--key-white));
  border: 1px solid var(--key-white-sh);
  border-radius: 0 0 7px 7px;
  box-shadow: inset 0 -6px 8px -6px rgba(0,0,0,.35);
  margin-right: 1px;
}
.pkey.black {
  position: absolute; top: 0;
  width: var(--bkw, 26px);
  height: 62%;
  background: linear-gradient(180deg, #3a322b 0%, #17120f 70%, #241d18 100%);
  border: 1px solid #000;
  border-radius: 0 0 6px 6px;
  box-shadow: 0 5px 6px -2px rgba(0,0,0,.6), inset 0 -3px 4px rgba(255,255,255,.08);
  z-index: 3;
  color: #d9cdbb;
}
.pkey.white.is-down, .pkey.white:active {
  background: linear-gradient(180deg, #f2ead9, #ddd2bd);
  transform: translatey(1px);
}
.pkey.black.is-down, .pkey.black:active {
  background: linear-gradient(180deg, #2a231d, #0c0908);
  transform: translateY(1px);
}
/* Resaltados (objetivo / correcto / error / info) */
.pkey.hl.white  { background: linear-gradient(180deg, #fbe6ab, var(--brass)); }
.pkey.hl.black  { background: linear-gradient(180deg, #b6832a, #6d4d14); }
.pkey.good.white { background: linear-gradient(180deg, #bff0e2, var(--good)); }
.pkey.good.black { background: linear-gradient(180deg, #2c9c82, #14624f); }
.pkey.bad.white  { background: linear-gradient(180deg, #f6c4cf, var(--bad)); }
.pkey.bad.black  { background: linear-gradient(180deg, #b23a56, #6f2333); }
.pkey.info.white { background: linear-gradient(180deg, #cdcffb, var(--info)); }
.pkey.info.black { background: linear-gradient(180deg, #5a5dc0, #34367a); }

.pkey-label {
  font-size: 11px; font-weight: 700; pointer-events: none;
  color: #6a5f4f;
  opacity: .9;
}
.pkey.black .pkey-label { color: #cdbfa9; font-size: 10px; }
.pkey.hl .pkey-label, .pkey.good .pkey-label, .pkey.bad .pkey-label { color: rgba(0,0,0,.65); }
.piano.hide-labels .pkey-label { display: none; }

/* mano/QWERTY hint */
.pkey-key { position: absolute; top: 6px; left: 50%; transform: translateX(-50%); font-size: 9px; color: var(--ink-mute); opacity: .0; transition: .2s; }
.piano.show-qwerty .pkey.white .pkey-key { opacity: .65; }

/* ============================================================
   PENTAGRAMA
   ============================================================ */
.staff-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.staff { width: 100%; height: auto; }
.staff .st-line { stroke: var(--ink-soft); stroke-width: 1.4; opacity: .6; }
.staff .st-ledger { stroke: var(--ink-soft); stroke-width: 1.6; }
.staff .st-clef { fill: var(--ink); font-family: var(--font-music); }
.staff .st-note { fill: var(--ink); }
.staff .st-note.good { fill: var(--good); }
.staff .st-note.bad { fill: var(--bad); }
.staff .st-acc { fill: var(--ink); font-family: var(--font-music); }
.staff .st-name { fill: var(--ink-mute); font-size: 13px; font-weight: 700; }

/* ============================================================
   METRÓNOMO
   ============================================================ */
.metro { display: grid; place-items: center; gap: 14px; padding: 10px; }
.metro-box {
  position: relative; width: 210px; height: 180px;
  display: grid; place-items: end center;
}
.metro-pend {
  position: absolute; bottom: 22px; left: 50%;
  width: 5px; height: 130px; border-radius: 6px;
  background: linear-gradient(var(--brass-strong), var(--brass));
  transform-origin: bottom center;
  transform: rotate(0deg);
}
.metro-weight { position: absolute; left: -6px; width: 17px; height: 17px; border-radius: 4px; background: var(--brass-strong); }
.metro-base { width: 150px; height: 20px; border-radius: 6px 6px 12px 12px; background: var(--panel-3); border: 1px solid var(--line-strong); }
.beats { display: flex; gap: 10px; }
.beat-dot { width: 20px; height: 20px; border-radius: 99px; background: var(--panel-3); border: 1px solid var(--line-strong); transition: .08s; }
.beat-dot.on { background: var(--ink-soft); }
.beat-dot.accent.on { background: var(--brass-strong); box-shadow: 0 0 14px 2px color-mix(in srgb, var(--brass) 60%, transparent); }
.beat-dot.pulse { transform: scale(1.28); }

.bpm-display { font-size: 52px; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -1px; }
.bpm-display small { font-size: 16px; color: var(--ink-mute); font-weight: 600; }

/* ============================================================
   CÍRCULO DE QUINTAS
   ============================================================ */
.cof-wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 22px; align-items: center; }
@media (max-width: 820px) { .cof-wrap { grid-template-columns: 1fr; } }
.cof {
  position: relative; width: min(420px, 90vw); aspect-ratio: 1; margin: 0 auto;
}
.cof-node {
  position: absolute; transform: translate(-50%, -50%);
  width: 58px; height: 58px; border-radius: 99px;
  display: grid; place-items: center; text-align: center; line-height: 1;
  border: 1px solid var(--line-strong); background: var(--panel-2); color: var(--ink);
  font-weight: 800; transition: .15s;
}
.cof-node small { display: block; font-size: 10px; color: var(--ink-mute); font-weight: 600; }
.cof-node.minor { width: 46px; height: 46px; font-size: 13px; background: var(--panel); }
.cof-node:hover { border-color: var(--accent); transform: translate(-50%,-50%) scale(1.06); }
.cof-node.active { background: var(--accent); color: var(--accent-ink); border-color: transparent; box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
.cof-node.active small { color: color-mix(in srgb, var(--accent-ink) 75%, transparent); }
.cof-center { position: absolute; inset: 34%; border-radius: 99px; border: 1px dashed var(--line-strong); display: grid; place-items: center; text-align: center; color: var(--ink-mute); font-size: 12px; }

.cof-info dl { display: grid; grid-template-columns: auto 1fr; gap: 8px 14px; margin-top: 10px; }
.cof-info dt { color: var(--ink-mute); font-size: 13px; }
.cof-info dd { font-weight: 700; }

/* ============================================================
   Feedback / animaciones
   ============================================================ */
.flash-good { animation: flashGood .5s var(--ease); }
.flash-bad { animation: shake .4s var(--ease); }
@keyframes flashGood { 0%{ box-shadow: var(--glow);} 100%{ box-shadow: none; } }
@keyframes shake { 0%,100%{transform:translateX(0)} 20%{transform:translateX(-7px)} 40%{transform:translateX(7px)} 60%{transform:translateX(-4px)} 80%{transform:translateX(4px)} }

.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(20px);
  padding: 12px 20px; border-radius: 12px; z-index: 60;
  background: var(--panel); border: 1px solid var(--line-strong); box-shadow: var(--shadow);
  font-weight: 700; opacity: 0; transition: .25s var(--ease); pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.good { border-color: color-mix(in srgb, var(--good) 55%, transparent); color: var(--good); }
.toast.bad { border-color: color-mix(in srgb, var(--bad) 55%, transparent); color: var(--bad); }

/* Notas cayendo (juego de lectura) */
.fall-stage { position: relative; overflow: hidden; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }

/* Home / ruta de aprendizaje */
.hero {
  padding: 30px; border-radius: var(--radius-lg);
  background:
    radial-gradient(600px 240px at 90% -20%, color-mix(in srgb, var(--brass) 22%, transparent), transparent 70%),
    var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}
.hero h1 { font-size: clamp(26px, 5vw, 40px); }
.hero p { color: var(--ink-soft); max-width: 60ch; margin-top: 10px; }
.hero .cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }

.path-card {
  display: flex; flex-direction: column; gap: 8px; padding: 18px;
  border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel);
  transition: transform .16s var(--ease), border-color .16s;
  cursor: pointer;
}
.path-card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.path-ico { font-size: 26px; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 12px; background: var(--panel-2); }
.path-card h3 { font-size: 17px; }
.path-card p { font-size: 13px; color: var(--ink-soft); }
.path-meta { margin-top: auto; font-size: 12px; color: var(--ink-mute); display: flex; align-items: center; gap: 8px; }

.help-note { display: flex; gap: 10px; padding: 12px 14px; border-radius: var(--radius-sm); background: color-mix(in srgb, var(--info) 10%, transparent); border: 1px solid color-mix(in srgb, var(--info) 30%, transparent); font-size: 13px; color: var(--ink-soft); }
.help-note b { color: var(--ink); }

/* ---------- Secuenciador de batería ---------- */
.seq { display: grid; gap: 6px; }
.seq-row { display: grid; grid-template-columns: 104px 1fr; gap: 10px; align-items: center; }
.seq-lab { font-size: 12px; color: var(--ink-soft); text-align: right; font-weight: 600; }
.seq-cells { display: grid; grid-template-columns: repeat(16, 1fr); gap: 4px; }
.seq-cell { aspect-ratio: 1; border-radius: 5px; background: var(--panel-3); border: 1px solid var(--line); cursor: pointer; transition: background .08s, transform .08s; }
.seq-cell:nth-child(4n+1) { border-color: var(--line-strong); }
.seq-cell.on { background: var(--accent); border-color: transparent; }
.seq-cell.ghost { background: color-mix(in srgb, var(--accent) 45%, var(--panel-3)); border-color: transparent; }
.seq-cell:hover { transform: scale(1.08); }
.seq-dot { aspect-ratio: 1; border-radius: 99px; background: var(--panel-3); border: 1px solid var(--line); }
.seq-dot.on { background: var(--ink-soft); box-shadow: 0 0 8px var(--ink-mute); transform: scale(1.15); }
.seq-dot:nth-child(4n+1) { border-color: var(--accent); }

/* ---------- Pads de acordes ---------- */
.pads { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 10px; }
.pad { position: relative; padding: 18px 10px 12px; border-radius: 14px; border: 1px solid var(--line-strong); background: var(--panel-2); text-align: center; cursor: pointer; transition: transform .08s, background .1s, border-color .1s; user-select: none; }
.pad:hover { border-color: var(--accent); }
.pad.is-down { background: linear-gradient(180deg, var(--brass-strong), var(--brass)); color: var(--accent-ink); border-color: transparent; transform: translateY(2px); }
.pad-key { position: absolute; top: 6px; left: 9px; font-size: 11px; font-weight: 800; opacity: .55; }
.pad-edit { position: absolute; top: 5px; right: 7px; font-size: 12px; opacity: .5; }
.pad-chord { font-size: 22px; font-weight: 800; line-height: 1.1; }
.pad-sub { font-size: 11px; color: var(--ink-mute); margin-top: 2px; }
.pad.is-down .pad-sub, .pad.is-down .pad-key { color: inherit; opacity: .8; }

.big-prompt { font-size: clamp(40px, 9vw, 76px); font-weight: 800; font-family: var(--font-serif); text-align: center; line-height: 1; }
.big-prompt small { display:block; font-size: 15px; font-family: var(--font-sans); color: var(--ink-mute); font-weight: 600; margin-top: 8px; letter-spacing: .04em; }