/* ============================================================
   BLUES PIANO — Base layout & componenti condivisi
   ============================================================ */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

body {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(184,67,79,0.10), transparent 60%),
    radial-gradient(900px 500px at 10% 0%, rgba(201,164,92,0.08), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

::selection { background: var(--brass-glow); color: var(--text); }

a { color: var(--brass-hi); text-decoration: none; }
a:hover { color: var(--brass); }

/* texture sottile a grana, dà calore "materico" */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Tipografia --- */
h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.12; letter-spacing: -0.015em; margin: 0; }
h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.4rem); }

.kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--brass);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.kicker::before { content: "♪"; font-size: 1rem; }

.lead { color: var(--text-soft); font-size: 1.12rem; max-width: 42rem; }

.muted { color: var(--text-faint); }
.tiny  { font-size: 0.82rem; }

/* --- Top navigation (sticky) --- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(13,12,17,0.92), rgba(13,12,17,0.72));
  border-bottom: 1px solid var(--border);
}
.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
}
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 10px var(--brass-glow);
}
.topnav { display: flex; gap: 0.3rem; align-items: center; flex-wrap: wrap; }
.topnav a {
  font-size: 0.86rem;
  color: var(--text-soft);
  padding: 0.4rem 0.7rem;
  border-radius: var(--r-pill);
  transition: background 0.15s, color 0.15s;
}
.topnav a:hover { background: var(--surface); color: var(--text); }
.topnav a.active { color: var(--brass); background: var(--surface); }

/* --- Bottoni --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.06s, filter 0.15s, background 0.15s, border-color 0.15s;
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--brass-hi), var(--brass));
  color: #2a2008;
  box-shadow: 0 6px 18px var(--brass-glow);
}
.btn-primary:hover { filter: brightness(1.06); color: #2a2008; }
.btn-ghost { background: transparent; border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { background: var(--surface); border-color: var(--border-glow); }
.btn-wine {
  background: linear-gradient(180deg, var(--wine), var(--wine-deep));
  color: #fff;
}
.btn-wine:hover { filter: brightness(1.08); }
.btn .arrow { transition: transform 0.15s; }
.btn:hover .arrow { transform: translateX(3px); }
.btn[aria-pressed="true"] {
  background: linear-gradient(180deg, var(--brass-hi), var(--brass));
  color: #2a2008;
  border-color: transparent;
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* --- Card / pannelli --- */
.panel {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 1.6rem;
  box-shadow: var(--shadow-2);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 1.4rem;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.card:hover { border-color: var(--border-glow); transform: translateY(-2px); box-shadow: var(--shadow-2); }

/* --- Chip / badge --- */
.chip {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.18rem 0.6rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-pill);
  color: var(--text-soft);
  background: var(--bg-2);
  white-space: nowrap;
}
.chip-brass { color: var(--brass-hi); border-color: var(--brass-deep); }
.chip-blue  { color: var(--blue-hi);  border-color: var(--blue); }
.chip-wine  { color: #f0a8af;         border-color: var(--wine); }

/* --- Sezioni titolo --- */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin: 0 0 1.5rem;
  flex-wrap: wrap;
}
.section-head h2 { margin: 0; }

/* --- Toolbar di controlli (lab / player) --- */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
}
.control-group {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.6rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
}
.control-group > label {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

select, input[type="number"] {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  padding: 0.35rem 0.55rem;
  font-family: var(--sans);
  font-size: 0.88rem;
}
select:focus, input:focus, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

input[type="range"] { accent-color: var(--brass); cursor: pointer; }

/* Toggle a segmenti (es. selezione tonalità) */
.segmented {
  display: inline-flex;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 3px;
  gap: 2px;
}
.segmented button {
  border: none;
  background: transparent;
  color: var(--text-soft);
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.32rem 0.7rem;
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.segmented button[aria-pressed="true"] {
  background: linear-gradient(180deg, var(--brass-hi), var(--brass));
  color: #2a2008;
}

/* --- Legenda colori scala --- */
.legend { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.legend .item { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.84rem; color: var(--text-soft); }
.legend .swatch { width: 14px; height: 14px; border-radius: 4px; box-shadow: var(--shadow-1); }
.swatch.tonic { background: var(--deg-tonic); }
.swatch.scale { background: var(--deg-scale); }
.swatch.blue  { background: var(--deg-blue); }

/* --- Status MIDI --- */
.midi-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}
.midi-status .led {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--text-dim);
  transition: background 0.2s, box-shadow 0.2s;
}
.midi-status.is-on  .led { background: var(--ok);  box-shadow: 0 0 8px var(--ok); }
.midi-status.is-off .led { background: var(--err); }
.midi-status.is-wait .led { background: var(--warn); box-shadow: 0 0 8px var(--warn); }

/* --- Callout / note --- */
.callout {
  border-left: 3px solid var(--brass);
  background: var(--bg-2);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 0.9rem 1.1rem;
  margin: 1.25rem 0;
  color: var(--text-soft);
}
.callout.warn { border-color: var(--warn); }
.callout.blue { border-color: var(--blue); }
.callout strong { color: var(--text); }

/* Termine spiegato la prima volta */
.term {
  color: var(--brass-hi);
  border-bottom: 1px dotted var(--brass-deep);
  cursor: help;
  font-weight: 600;
}

/* --- Footer --- */
.site-footer {
  margin-top: var(--gap-xl);
  border-top: 1px solid var(--border);
  padding: 2rem 0 3rem;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
}

/* Utility */
.stack > * + * { margin-top: var(--gap-md); }
.row { display: flex; gap: var(--gap-sm); align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.hidden { display: none !important; }
.center { text-align: center; }
.grid { display: grid; gap: 1rem; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 760px) {
  .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; }
  .topnav { display: none; }
}