/* ============================================================
   BLUES PIANO — Stili hub, laboratorio e pagine lezione
   ============================================================ */

/* --- HERO --- */
.hero {
  padding: clamp(3rem, 8vw, 5.5rem) 0 2.5rem;
  position: relative;
}
.hero h1 { max-width: 18ch; margin: 1rem 0 1.2rem; }
.hero h1 .accent { color: var(--brass); font-style: italic; }
.hero .lead { font-size: 1.2rem; }
.hero-cta { display: flex; gap: 0.8rem; flex-wrap: wrap; margin-top: 1.8rem; }

/* anteprima tasti decorativa nell'hero */
.hero-keys {
  display: flex;
  gap: 3px;
  margin-top: 2.5rem;
  height: 60px;
  opacity: 0.8;
}
.hero-keys span {
  flex: 1;
  border-radius: 0 0 5px 5px;
  background: linear-gradient(180deg, #efe7d6, #cdbf9f);
}
.hero-keys span.b { background: linear-gradient(180deg, #2a2530, #15121c); flex: 0.6; }
.hero-keys span.lit { background: linear-gradient(180deg, var(--brass-hi), var(--brass)); }
.hero-keys span.blue { background: linear-gradient(180deg, var(--blue-hi), var(--blue)); }

/* --- LABORATORIO --- */
.lab { margin: 2rem 0 1rem; }
.lab-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
  margin-bottom: 1rem;
}
.lab-toolbar .spacer { flex: 1; min-width: 0; }
.lab-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  align-items: center;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.scale-notes { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* --- Griglia lezioni --- */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
@media (max-width: 900px) { .lesson-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .lesson-grid { grid-template-columns: 1fr; } }

.lesson-card .lesson-num {
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--brass-deep);
  line-height: 1;
}
.lesson-card.is-locked { opacity: 0.62; }
.lesson-card::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brass), var(--wine));
  opacity: 0;
  transition: opacity 0.2s;
}
.lesson-card:not(.is-locked):hover::after { opacity: 1; }

/* --- Pagine lezione: corpo del testo --- */
.lesson-body { max-width: 720px; }
.lesson-body p { color: var(--text-soft); }
.lesson-body h2 { margin: 2.5rem 0 1rem; }
.lesson-body h3 { margin: 1.8rem 0 0.6rem; color: var(--brass-hi); }
.lesson-body ul, .lesson-body ol { color: var(--text-soft); padding-left: 1.3rem; }
.lesson-body li { margin: 0.3rem 0; }
.lesson-body strong { color: var(--text); }

.progress-bar {
  height: 6px;
  background: var(--bg-2);
  border-radius: var(--r-pill);
  overflow: hidden;
  margin: 0.5rem 0 0;
}
.progress-bar > span {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--brass), var(--brass-hi));
  transition: width 0.4s;
}

/* navigazione tra lezioni */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

/* riquadro esercizio */
.exercise {
  border: 1px solid var(--brass-deep);
  background: linear-gradient(180deg, rgba(201,164,92,0.06), transparent);
  border-radius: var(--r-md);
  padding: 1.4rem;
  margin: 1.6rem 0;
}
.exercise .ex-head {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--mono); font-size: 0.74rem; text-transform: uppercase;
  letter-spacing: 0.15em; color: var(--brass); margin-bottom: 0.8rem;
}
.exercise .ex-head::before { content: "✱"; font-size: 1rem; }

/* pulsante "in riproduzione" */
.btn.is-playing { position: relative; }
.btn.is-playing::after {
  content: "";
  position: absolute; inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 0 0 var(--brass-glow);
  animation: pulse 0.9s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 var(--brass-glow); }
  100% { box-shadow: 0 0 0 12px rgba(201,164,92,0); }
}

/* confronto A/B (es. dritta vs blues) */
.ab-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.2rem 0; }
@media (max-width: 560px) { .ab-compare { grid-template-columns: 1fr; } }
.ab-card {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.1rem;
  background: var(--surface);
}
.ab-card h4 { margin: 0 0 .3rem; font-family: var(--display); font-size: 1.05rem; }
.ab-card.blue-side { border-color: var(--brass-deep); background: linear-gradient(180deg, rgba(201,164,92,.06), transparent); }
.ab-card p { font-size: .9rem; margin: .2rem 0 .9rem; }

/* riga di pulsanti demo */
.demo-row { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1rem 0; align-items: center; }

/* numero lezione grande in testata */
.lesson-eyebrow {
  display: flex; align-items: baseline; gap: .8rem; flex-wrap: wrap;
}
.lesson-eyebrow .of { color: var(--text-faint); font-family: var(--mono); font-size: .8rem; }

/* tabella nomi note */
.note-table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: .95rem; }
.note-table th, .note-table td {
  border: 1px solid var(--border);
  padding: .6rem .5rem;
  text-align: center;
}
.note-table th { color: var(--text-faint); font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 600; }
.note-table td:first-child { text-align: left; color: var(--text-faint); font-family: var(--mono); font-size: .8rem; }
.note-table .en { font-family: var(--display); font-size: 1.15rem; color: var(--brass-hi); font-weight: 600; }
.note-table .it { color: var(--text-soft); }

/* --- Griglia 12 battute (Lezione 4) --- */
.bar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .5rem;
  margin: 1rem 0;
}
@media (max-width: 560px) { .bar-grid { gap: .35rem; } }
.bar-cell {
  position: relative;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--bg-2);
  padding: .7rem .4rem;
  text-align: center;
  transition: background .12s, border-color .12s, transform .12s;
  min-height: 64px;
  display: flex; flex-direction: column; justify-content: center; gap: .15rem;
}
.bar-cell .bar-n { font-family: var(--mono); font-size: .6rem; color: var(--text-faint); }
.bar-cell .bar-chord { font-family: var(--display); font-size: 1.2rem; font-weight: 600; color: var(--text); }
.bar-cell .bar-fn { font-family: var(--mono); font-size: .65rem; color: var(--brass); }
.bar-cell.fn-IV { background: #1b1822; }
.bar-cell.fn-V  { background: #221820; }
.bar-cell.active {
  background: linear-gradient(180deg, var(--brass-hi), var(--brass));
  border-color: var(--brass-hi);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--brass-glow);
}
.bar-cell.active .bar-chord, .bar-cell.active .bar-fn, .bar-cell.active .bar-n { color: #2a2008; }
.bar-cell .turn-tag {
  position: absolute; top: 3px; right: 4px;
  font-family: var(--mono); font-size: .5rem; color: var(--wine);
  text-transform: uppercase; letter-spacing: .05em;
}
.bar-cell.active .turn-tag { color: #5a1018; }

/* righe A-A-B */
.form-rows { display: flex; flex-direction: column; gap: .3rem; margin: .6rem 0 0; }
.form-rows .frow { display: flex; align-items: center; gap: .6rem; }
.form-rows .frow .tag-ab {
  font-family: var(--display); font-weight: 600; font-size: .9rem;
  width: 1.5rem; color: var(--brass-hi);
}
.form-rows .frow .desc { font-size: .85rem; color: var(--text-soft); }

/* --- Timeline dello swing (Lezione 6): crome lunghe-corte --- */
.swing-tl { margin: 1.2rem 0; }
.swing-tl .beats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.swing-tl .beat {
  display: flex; gap: 3px; height: 46px;
  border: 1px solid var(--border); border-radius: var(--r-sm);
  overflow: hidden; background: var(--bg-2);
}
.swing-tl .eighth {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: .7rem; color: #2a2008;
  transition: flex-basis .15s ease;
}
.swing-tl .eighth.long  { background: linear-gradient(180deg, var(--brass-hi), var(--brass)); }
.swing-tl .eighth.short { background: linear-gradient(180deg, #6a5a36, var(--brass-deep)); color: var(--brass-hi); }
.swing-tl .beat.on { box-shadow: inset 0 0 0 2px var(--wine); }
.swing-tl .labels { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 4px; }
.swing-tl .labels span { text-align: center; font-family: var(--mono); font-size: .7rem; color: var(--text-faint); }

.swing-readout {
  font-family: var(--display); font-size: 1.3rem; font-weight: 600; color: var(--brass-hi);
}

/* pannello gioco/quiz */
.game-panel {
  border: 1px solid var(--border-strong);
  background: var(--bg-2);
  border-radius: var(--r-md);
  padding: 1.1rem;
  margin-top: 1rem;
}
.game-status { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; margin-bottom: .6rem; }
.game-status .score { font-family: var(--mono); color: var(--brass-hi); font-size: 1.1rem; }
.game-msg { min-height: 1.5em; color: var(--text-soft); }
.choice-row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .8rem; }
.choice-row button {
  font-family: var(--display); font-size: 1.05rem; font-weight: 600;
  min-width: 3.2rem;
}