/* ============================================================
   TUNING FORK GENERATOR — tool.css
   Giant A440 button, presets, sine wave canvas, playing indicator
   ============================================================ */

/* ── Tool Labels ── */
.tool-label {
  font-family: var(--font-mono);
  color: var(--color-primary);
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: var(--space-xs);
}

/* ── Giant A440 Button ── */
.a440-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 3px solid var(--color-primary);
  background: radial-gradient(circle at 40% 35%, rgba(0, 255, 65, 0.12) 0%, rgba(0, 0, 0, 0.9) 70%);
  cursor: pointer;
  transition: box-shadow 0.25s ease, transform 0.15s ease, border-color 0.25s ease;
  position: relative;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.a440-btn:hover {
  box-shadow:
    0 0 30px rgba(0, 255, 65, 0.3),
    0 0 60px rgba(0, 255, 65, 0.15),
    inset 0 0 30px rgba(0, 255, 65, 0.08);
  transform: scale(1.03);
}

.a440-btn:active {
  transform: scale(0.97);
}

.a440-btn.playing {
  border-color: #00ff41;
  box-shadow:
    0 0 20px rgba(0, 255, 65, 0.5),
    0 0 50px rgba(0, 255, 65, 0.25),
    0 0 80px rgba(0, 255, 65, 0.1),
    inset 0 0 30px rgba(0, 255, 65, 0.1);
  animation: a440-pulse 1.5s ease-in-out infinite;
}

@keyframes a440-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0,255,65,0.5), 0 0 50px rgba(0,255,65,0.25), 0 0 80px rgba(0,255,65,0.1), inset 0 0 30px rgba(0,255,65,0.1); }
  50% { box-shadow: 0 0 30px rgba(0,255,65,0.7), 0 0 70px rgba(0,255,65,0.35), 0 0 100px rgba(0,255,65,0.15), inset 0 0 40px rgba(0,255,65,0.15); }
}

.a440-btn__icon {
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: 4px;
  filter: drop-shadow(0 0 8px rgba(0, 255, 65, 0.4));
}

.a440-btn__text {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1.1;
  text-shadow: 0 0 15px rgba(0, 255, 65, 0.4);
}

.a440-btn__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-top: 4px;
}

.a440-btn.playing .a440-btn__sub {
  color: var(--color-primary);
}

/* ── Frequency Display ── */
.freq-hero {
  text-align: center;
  margin-bottom: var(--space-lg);
  padding: var(--space-md) 0;
}

.freq-hero__hz {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4rem);
  color: var(--color-primary);
  line-height: 1;
  text-shadow: 0 0 25px rgba(0, 255, 65, 0.4);
}

.freq-hero__unit {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-size: var(--fs-lg);
  margin-top: 2px;
}

.freq-hero__note {
  display: inline-block;
  font-family: var(--font-mono);
  color: var(--color-secondary);
  font-size: var(--fs-md);
  margin-top: var(--space-xs);
  padding: 4px 16px;
  border: 1px solid var(--color-secondary);
  border-radius: var(--radius-sm);
}

.freq-hero__cents {
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  margin-top: var(--space-xs);
  min-height: 1.2em;
}

/* ── Playing Indicator ── */
.playing-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-md);
  background: rgba(0, 255, 65, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  min-height: 48px;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.playing-indicator.active {
  background: rgba(0, 255, 65, 0.08);
  border-color: rgba(0, 255, 65, 0.3);
  color: var(--color-primary);
}

.playing-indicator.active::before {
  content: '';
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #00ff41;
  box-shadow: 0 0 8px rgba(0, 255, 65, 0.6), 0 0 16px rgba(0, 255, 65, 0.3);
  animation: indicator-glow 1s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes indicator-glow {
  0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(0,255,65,0.6), 0 0 16px rgba(0,255,65,0.3); }
  50% { opacity: 0.6; box-shadow: 0 0 4px rgba(0,255,65,0.3), 0 0 8px rgba(0,255,65,0.15); }
}

/* ── Preset Row ── */
.preset-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.preset-row .preset-btn {
  min-width: 70px;
  font-family: var(--font-mono);
  font-weight: 600;
  transition: box-shadow 0.2s ease, transform 0.1s ease;
}

.preset-row .preset-btn:hover {
  transform: translateY(-1px);
}

.preset-row .preset-btn.active {
  box-shadow: 0 0 12px rgba(0, 255, 65, 0.3);
}

/* ── Timer Buttons ── */
.timer-btn.active {
  background: var(--color-primary);
  color: var(--color-bg);
  border-color: var(--color-primary);
}

/* ── Canvas Sine Wave ── */
#scope-canvas {
  display: block;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .a440-btn {
    width: 180px;
    height: 180px;
  }

  .a440-btn__icon {
    font-size: 2rem;
  }

  .a440-btn__text {
    font-size: 1.4rem;
  }

  .freq-hero__hz {
    font-size: 2.5rem;
  }

  .preset-row {
    justify-content: center;
  }

  .preset-row .preset-btn {
    min-width: 60px;
    font-size: var(--fs-xs);
  }
}

@media (max-width: 380px) {
  .a440-btn {
    width: 160px;
    height: 160px;
  }

  .a440-btn__icon {
    font-size: 1.6rem;
  }
}