/* Buttons: "Resonance" (primary) and "Ghost Rune" (secondary). Both follow --accent. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 2.75rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  background: none;
  color: var(--text-strong);
  font: 600 0.75rem/1rem var(--font-ui);
  letter-spacing: var(--tracking-label-md);
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s, color 0.2s;
}

.btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.btn .icon {
  width: 1.125rem;
  height: 1.125rem;
}

.btn--primary {
  border-color: var(--accent-line);
  background: linear-gradient(135deg, var(--accent-soft), rgba(56, 225, 255, 0.04));
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: color-mix(in srgb, var(--accent) 25%, transparent);
  box-shadow: inset 0 0 12px color-mix(in srgb, var(--accent) 30%, transparent), 0 0 16px var(--accent-glow);
}

.btn--ghost {
  border-color: var(--hairline-strong);
  color: var(--text-muted);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--text-strong);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-strong);
}

.btn--danger {
  border-color: color-mix(in srgb, var(--coral) 55%, transparent);
  background: color-mix(in srgb, var(--coral) 10%, transparent);
  color: var(--pearl);
}

.btn--danger:hover,
.btn--danger:focus-visible {
  background: color-mix(in srgb, var(--coral) 22%, transparent);
  box-shadow: 0 0 16px color-mix(in srgb, var(--coral) 30%, transparent);
}

.btn--lg {
  min-height: 3.25rem;
  padding: 1rem 2.25rem;
  font-size: 0.8125rem;
}

/* Round glyph button (back, pause). Give it an aria-label. */
.btn--icon {
  width: 2.75rem;
  padding: 0;
  flex: none;
}