/* ============================================================================
 * components/buttons.css — button system
 * ============================================================================
 * Depends on: core/tokens.css
 * Authoritative source: ForceX_Typography_and_CSS_Catalog_Spec.md §"Buttons"
 *
 * Variants:
 *   .btn-primary   — primary CTA (filled accent)
 *   .btn-secondary — supporting action (filled surface, bordered)
 *   .btn-ghost     — minimal emphasis (transparent + bordered)
 *   .btn-danger    — destructive action (red text + bordered)
 *
 * Modifiers:
 *   .btn-block     — full width of parent
 * ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  line-height: 1;
  height: 44px;
  padding: 0 var(--space-5);
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--motion-base), border-color var(--motion-base), color var(--motion-base);
}
.btn:hover { text-decoration: none; }
.btn:disabled { cursor: not-allowed; opacity: 0.6; }

.btn-primary {
  background: var(--accent);
  /* theme-neutral: white on --accent blue passes WCAG AA in both themes;
     --accent is identical across themes. Do NOT replace with var(--text). */
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-lt); }
.btn-primary:disabled { background: var(--border2); color: var(--muted); opacity: 1; }

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border2);
}
.btn-secondary:hover:not(:disabled) {
  border-color: var(--accent-lt);
  background: var(--accent-bg);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  color: var(--muted2);
  border: 1px solid var(--border2);
}
.btn-ghost:hover:not(:disabled) {
  border-color: var(--accent-lt);
  color: var(--text);
  background: var(--accent-bg);
}

.btn-danger {
  background: transparent;
  color: var(--red);
  border: 1px solid rgba(248, 113, 113, 0.4);
}
.btn-danger:hover:not(:disabled) {
  background: var(--red-bg);
  border-color: var(--red);
}

.btn-block { width: 100%; }