/* ============================================================
   Site header, shared by every page (chord, sight-reading,
   arpeggios, repertoire, converter). Loaded after each page's
   own stylesheet and built only from the tokens every page
   defines, so it follows the chord trainer's themes too.

   Étude                              [trophy 3]  [● Connect MIDI]
   Op. 4 No 1                                    No device found ?
   ─────────────────────────────────────────────────────────────
   I Chords   II Sight-reading   III Arpeggios   IV Repertoire
   ─────────────────────────────────────────────────────────────
   ============================================================ */

.site-header {
  display: block;
  margin-bottom: 2.8rem;
  border-bottom: 1px solid var(--line);
}

.hd-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding-bottom: 1.1rem;
}

/* ---- brand ---- */

.hd-brand {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-decoration: none;
  color: var(--ivory);
  line-height: 1;
}
.hd-name {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 2rem;
  letter-spacing: 0.04em;
}
.hd-name em { font-style: italic; color: var(--gold); }
.hd-opus {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--ivory-dim);
}

/* ---- actions (achievements, MIDI, mic) ---- */

.hd-actions {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hd-btn,
.site-header .input-mode-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 2.3rem;
  padding: 0 0.95rem;
  margin: 0;
  background: transparent;
  border: 1px solid rgba(var(--gold-rgb), 0.4);
  border-radius: 2px;
  color: var(--ivory-dim);
  font-family: var(--font-display);
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.hd-btn:hover,
.site-header .input-mode-btn:hover {
  color: var(--gold-bright);
  border-color: var(--gold-bright);
  background: transparent;
}
.hd-btn svg,
.site-header .input-mode-btn svg { width: 15px; height: 15px; display: block; flex: none; }

.hd-count {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0;
  color: var(--gold);
}

/* MIDI button: a status dot, then "Connect MIDI" or the device name. */
.hd-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0.55;
  flex: none;
}
.hd-midi-label {
  max-width: 13rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.hd-btn.is-connected {
  color: var(--ivory);
  border-color: rgba(107, 142, 107, 0.55);
  cursor: default;
}
.hd-btn.is-connected .hd-dot {
  background: var(--sage);
  opacity: 1;
  box-shadow: 0 0 7px var(--sage);
}
.hd-btn.is-connected .hd-midi-label {
  text-transform: none;
  letter-spacing: 0.06em;
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.85rem;
}
.hd-btn.is-error .hd-dot { background: var(--crimson); opacity: 1; }

/* Chord trainer: Mic | MIDI is one segmented control in the same style. */
.site-header .input-selector {
  display: inline-flex;
  border: none;
  background: transparent;
  gap: 0;
}
.site-header .input-mode-btn + .input-mode-btn { margin-left: -1px; }
.site-header .input-mode-btn.active {
  color: var(--gold-bright);
  border-color: var(--gold);
  background: rgba(var(--gold-rgb), 0.12);
  box-shadow: none;
  position: relative;
  z-index: 1;
}

/* Status line under the buttons ("No device found ?"): floats so it never
   pushes the nav down. */
.hd-overlay,
.site-header .input-overlay {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.45rem;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
  z-index: 20;
}
.hd-overlay > *,
.site-header .input-overlay > * {
  background: color-mix(in srgb, var(--ink) 92%, transparent);
  padding: 0.25rem 0.45rem;
  border-radius: 2px;
}

/* ---- trainer navigation ---- */

.hd-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 2.4rem;
  border-top: 1px solid rgba(var(--gold-rgb), 0.22);
}
.hd-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.85rem 0 0.8rem;
  text-decoration: none;
  color: var(--ivory-dim);
  font-family: var(--font-display);
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.hd-num {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--gold);
  opacity: 0.7;
  min-width: 1.4em;
}
.hd-link:hover { color: var(--ivory); }
.hd-link:hover .hd-num { opacity: 1; }
.hd-link.is-active { color: var(--ivory); }
.hd-link.is-active .hd-num { opacity: 1; }
.hd-link.is-active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--gold);
}

/* ---- phones ---- */

@media (max-width: 600px) {
  .site-header { margin-bottom: 1.8rem; }
  .hd-top { padding-bottom: 0.9rem; gap: 0.8rem; }
  .hd-name { font-size: 1.7rem; }
  .hd-opus { font-size: 0.78rem; }
  .hd-btn,
  .site-header .input-mode-btn { height: 2.2rem; padding: 0 0.7rem; }
  .hd-btn .hd-label { display: none; }
  .hd-midi-label { max-width: 7.5rem; }
  .hd-overlay,
  .site-header .input-overlay { left: auto; right: 0; }
  /* Four entries as a 2×2 index, like a programme. */
  .hd-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1rem; }
  .hd-link { justify-self: start; padding: 0.7rem 0 0.65rem; font-size: 0.6rem; letter-spacing: 0.18em; }
}