@layer components {
/* buttons.css — Button components (Northwest navy: flat fills, hairline outlines) */
/* Hierarchy rule: at most ONE filled button per screen. Everything else is
   .btn--secondary (outlined) or .btn--plain (text). See UIGUIDE. */

.btn {
  --btn-bg: transparent;
  --btn-text: var(--color-ink);
  --btn-border: var(--color-border);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: var(--line-height-tight);
  cursor: pointer;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
}

.btn:active:not(:disabled):not(.is-disabled) {
  transform: scale(0.96);
}

/* ─── Primary — the single filled action ─── */
.btn--primary {
  --btn-bg: var(--color-primary);
  --btn-text: var(--color-on-primary);
  --btn-border: var(--color-primary);
}

.btn--primary:hover {
  --btn-bg: var(--color-primary-hover);
  --btn-border: var(--color-primary-hover);
}

.btn--primary:active:not(:disabled) {
  --btn-bg: var(--color-primary-hover);
}

/* ─── Secondary — outlined ─── */
.btn--secondary {
  --btn-bg: var(--color-canvas-raised);
  --btn-text: var(--color-primary-muted);
  --btn-border: var(--color-border);
}

.btn--secondary:hover {
  --btn-border: var(--color-border-strong);
  --btn-text: var(--color-primary-text);
}

.btn--secondary:active:not(:disabled) {
  --btn-bg: var(--color-canvas-alt);
}

/* ─── Plain / Ghost ─── */
.btn--plain {
  --btn-bg: transparent;
  --btn-text: var(--color-ink-subtle);
  --btn-border: transparent;
  padding: var(--space-2) var(--space-3);
  transition:
    background var(--duration-snap) var(--ease-out),
    color var(--duration-snap) var(--ease-out);
}

.btn--plain:hover {
  --btn-bg: var(--color-canvas-alt);
  --btn-text: var(--color-ink);
}

/* ─── Negative / Danger — outlined by default ─── */
.btn--negative {
  --btn-bg: transparent;
  --btn-text: var(--color-negative);
  --btn-border: var(--color-negative);
}

.btn--negative:hover {
  --btn-bg: var(--color-negative-soft);
}

/* Filled danger is reserved for the confirming action inside a destructive dialog. */
.btn--negative.btn--solid {
  --btn-bg: var(--color-negative);
  --btn-text: var(--color-on-primary);
}

.btn--negative.btn--solid:hover {
  --btn-bg: var(--color-negative);
  filter: brightness(0.92);
}

[data-theme="dark"] .btn--negative.btn--solid {
  --btn-text: var(--color-canvas);
}

/* ─── Mint — terminal completion ONLY (Resolve, scenario complete) ───
   Deliberately scarce: if a screen shows two of these, one of them is wrong. */
.btn--mint {
  --btn-bg: var(--color-mint);
  --btn-text: var(--color-on-mint);
  --btn-border: var(--color-mint);
}

.btn--mint:hover {
  filter: brightness(0.95);
}

/* ─── Sizes ─── */
.btn--sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  gap: var(--space-1);
}

.btn--lg {
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-base);
}

.btn--circle {
  padding: var(--space-2);
  border-radius: var(--radius-full);
  aspect-ratio: 1;
}

/* ─── States ─── */
.btn.is-disabled,
.btn:disabled {
  opacity: 0.45;
  pointer-events: none;
}

.btn.is-loading {
  position: relative;
  color: transparent;
}

.btn.is-loading::after {
  content: "";
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid oklch(1 0 0 / 0.3);
  border-top-color: oklch(1 0 0);
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

.btn.is-loading::before {
  content: "";
  position: absolute;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  opacity: 0;
  animation: pulse-ring 1.2s var(--ease-out) infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pulse-ring {
  0% { transform: scale(0.8); opacity: 0.4; }
  100% { transform: scale(1.6); opacity: 0; }
}

/* ─── Step Type Buttons ─── */
.btn--step-question  { --step-hue: var(--hue-question); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-action    { --step-hue: var(--hue-action); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-message   { --step-hue: var(--hue-message); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-escalate  { --step-hue: var(--hue-escalate); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-resolve   { --step-hue: var(--hue-resolve); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-subflow   { --step-hue: var(--hue-subflow); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-sub-flow  { --step-hue: var(--hue-subflow); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }
.btn--step-form      { --step-hue: var(--hue-form); --btn-bg: var(--step-solid); --btn-text: var(--step-on-solid); --btn-border: var(--step-solid); }

/* ─── Button Group ─── */
.btn-group {
  display: inline-flex;
}

.btn-group .btn {
  border-radius: 0;
}

.btn-group .btn:first-child {
  border-radius: var(--radius) 0 0 var(--radius);
}

.btn-group .btn:last-child {
  border-radius: 0 var(--radius) var(--radius) 0;
}

.btn-group .btn + .btn {
  margin-left: -1px;
}

/* --- Dark mode toggle ---
   A button, not nav furniture: two layouts render it (application and player),
   and only one of them loads navigation.css, which is where this used to live.
   The Player's header showed a raw UA button — grey fill, outset border, square
   corners — because reset.css neutralises only font and colour on a button, so
   an unstyled one keeps its browser chrome. It sits in components with the rest
   of the buttons, which every layout loads. */
.dark-mode-toggle {
  padding: 0.5rem;
  border-radius: var(--radius-full);
  background: var(--color-canvas-raised);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark-mode-toggle:hover {
  background: var(--color-border);
  transform: scale(1.1);
}

.dark-mode-toggle:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}
}