/* Headphone Frequency Response Test — tool-specific overrides only. SIGNAL tool (no mic). */

/* ── Hero caveat note ── */
.hfr-warn-note {
  max-width: 820px; margin: var(--space-md) auto 0;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border); border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-sm); background: rgba(0, 255, 65, 0.04);
  color: var(--color-text-muted); font-size: 0.9rem; line-height: 1.6; text-align: left;
}
.hfr-warn-note strong { color: var(--color-text); }

/* ── Big readout ── */
.hfr-readout {
  text-align: center; padding: var(--space-md) var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: rgba(0, 255, 65, 0.02); margin-bottom: var(--space-md);
}
.hfr-readout__label {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--color-text-muted);
}
.hfr-readout__freq {
  font-family: var(--font-display, 'Orbitron', sans-serif);
  font-size: clamp(2.2rem, 7vw, 3.6rem); line-height: 1.1; color: var(--color-primary);
  text-shadow: 0 0 16px rgba(0, 255, 65, 0.45); font-variant-numeric: tabular-nums;
  margin: 4px 0 6px;
}
.hfr-readout__band {
  font-family: var(--font-mono); font-size: 0.92rem; color: var(--color-secondary); min-height: 1.3em;
}

/* ── Scale canvas + band labels ── */
.hfr-canvas {
  display: block; width: 100%; height: 150px;
  border-radius: var(--radius-sm); background: #060a08; border: 1px solid var(--color-border);
}
.hfr-bandbar {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; margin-top: 6px;
}
.hfr-bandbar__seg {
  font-family: var(--font-mono); font-size: 0.66rem; text-align: center; line-height: 1.25;
  padding: 4px 2px; border-radius: var(--radius-sm); color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.hfr-bandbar__seg--sub { border-left: 3px solid rgba(80, 120, 255, 0.7); }
.hfr-bandbar__seg--bass { border-left: 3px solid rgba(0, 200, 255, 0.7); }
.hfr-bandbar__seg--lowmid { border-left: 3px solid rgba(0, 255, 160, 0.7); }
.hfr-bandbar__seg--mid { border-left: 3px solid rgba(0, 255, 65, 0.8); }
.hfr-bandbar__seg--presence { border-left: 3px solid rgba(255, 200, 60, 0.8); }
.hfr-bandbar__seg--treble { border-left: 3px solid rgba(255, 120, 60, 0.8); }

/* ── Controls ── */
.hfr-controls { display: flex; flex-wrap: wrap; gap: var(--space-md); margin-top: var(--space-lg); }
.hfr-field { flex: 1 1 200px; min-width: 160px; }
.hfr-field--full { flex-basis: 100%; margin-top: var(--space-md); }
.hfr-select {
  width: 100%; margin-top: 6px; padding: 10px 12px;
  background: var(--color-bg); color: var(--color-text);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: var(--font-mono); font-size: 0.95rem;
}
.hfr-select:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 2px rgba(0, 255, 65, 0.18); }
.hfr-select:disabled { opacity: 0.45; cursor: not-allowed; }
.hfr-range { width: 100%; margin-top: 10px; accent-color: var(--color-primary); cursor: pointer; }
.hfr-range:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 4px; }

.input-label {
  display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-sm);
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--color-text-muted);
}
.control-label__val { font-family: var(--font-mono); color: var(--color-secondary); font-weight: 600; white-space: nowrap; }

/* ── Actions ── */
.hfr-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); margin-top: var(--space-lg); }
.btn.is-playing { background: #ff4488; border-color: #ff4488; color: #0a0a0a; }
.btn.is-playing::before {
  content: ''; display: inline-block; width: 10px; height: 10px; border-radius: 50%;
  background: #fff; margin-right: 6px; vertical-align: middle;
  animation: hfr-pulse 1.2s ease-in-out infinite;
}
@keyframes hfr-pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.4; transform: scale(0.7); } }
@media (prefers-reduced-motion: reduce) { .btn.is-playing::before { animation: none; } }

/* ── Status line ── */
.hfr-status {
  margin-top: var(--space-md); padding: 8px 12px;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--font-mono); font-size: 0.85rem; color: var(--color-text-muted); min-height: 1.2em;
}

/* ── Quick checks ── */
.hfr-quick { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-sm); margin-top: var(--space-md); }
.hfr-quick__label { font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-text-muted); }
.hfr-chip {
  background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-full);
  padding: 6px 14px; color: var(--color-secondary); font-family: var(--font-mono); font-size: 0.8rem;
  cursor: pointer; transition: border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.hfr-chip:hover, .hfr-chip:focus-visible {
  border-color: var(--color-primary); color: var(--color-primary); outline: none;
  box-shadow: 0 0 10px rgba(0, 255, 65, 0.25);
}

/* ── Content / FAQ (shared pattern, scoped here) ── */
.content-section { max-width: 800px; margin: 0 auto var(--space-lg); color: var(--color-text); line-height: 1.7; }
.content-section p { margin-bottom: var(--space-sm); }

.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); margin-bottom: var(--space-sm); overflow: hidden; }
.faq-question {
  padding: var(--space-md); cursor: pointer; font-weight: 600; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-md);
  color: var(--color-text-bright);
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after { content: '+'; color: var(--color-primary); font-size: 1.3em; font-weight: 700; }
details[open] .faq-question::after { content: '−'; }
.faq-answer {
  padding: 0 var(--space-md) var(--space-md); color: var(--color-text-muted); line-height: 1.75;
  border-top: 1px solid var(--color-border); padding-top: var(--space-sm);
}

/* ── Related tools ── */
.related-tools-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md);
  max-width: 900px; margin: 0 auto;
}
.related-tool-card {
  display: block; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-md); text-decoration: none;
  transition: border-color 0.2s, transform 0.2s; text-align: left;
}
.related-tool-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.related-tool-card__title { font-family: var(--font-display); font-size: 0.95rem; color: var(--color-primary); margin-bottom: var(--space-xs); }
.related-tool-card__desc { font-size: 0.82rem; color: var(--color-text-muted); line-height: 1.5; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .related-tools-grid { grid-template-columns: 1fr; }
  .hfr-bandbar { grid-template-columns: repeat(3, 1fr); }
}