.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: var(--tap);
  padding: 0 var(--space-3);
  border: var(--line-width) solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--ink);
  font-size: var(--text-md);
  font-weight: 500;
  line-height: var(--leading-tight);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}

/* display: inline-flex outranks the browser's own [hidden] rule, so a
   button rendered hidden (a Clear with nothing to clear) would still show. */
.button[hidden] {
  display: none;
}

.button:hover {
  background: var(--surface-sunken);
}

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

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--ink-on-accent);
}

/* The primary action keeps Limberjack's signature hover: the accent sweeping
   through the good tone and back. Reduced motion gets a still blend. */
.button-primary:hover {
  background-image: linear-gradient(-45deg, var(--accent), var(--good), var(--accent), var(--good));
  background-size: 400% 200%;
  animation: button-primary-sweep 5s ease infinite;
}

@keyframes button-primary-sweep {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .button-primary:hover {
    animation: none;
  }
}

.button-quiet {
  border-color: transparent;
  background: transparent;
  color: var(--ink-muted);
}

.button-quiet:hover {
  background: var(--surface-sunken);
  color: var(--ink);
}

.button-danger {
  border-color: var(--danger);
  background: var(--danger);
  color: var(--ink-on-accent);
}

.button-danger:hover {
  background: var(--danger);
  filter: brightness(0.92);
}

.button-small {
  min-width: var(--tap-dense);
  min-height: var(--tap-dense);
  padding: 0 var(--space-2);
  font-size: var(--text-sm);
}

.button-large {
  min-height: var(--tap-large);
  padding: 0 var(--space-6);
  font-size: var(--text-lg);
}

/* For a dark ground: white ink on a translucent outline that turns solid
   on hover. */
.button-inverse {
  border-color: var(--line-on-dark);
  background: transparent;
  color: var(--ink-on-dark);
}

.button-inverse:hover {
  border-color: var(--ink-on-dark);
  background: var(--fill-on-dark);
}

.button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--ink-on-accent);
}

@media (pointer: fine) {
  .button {
    min-height: var(--tap-fine);
  }

  .button-small {
    min-height: var(--tap-dense);
  }

  .button-large {
    min-height: var(--tap-large);
  }
}