/* BTDT button style: material — elevated shadows + hover lift */
:is(.btn-solid, .btn-outline, .btn-subtle, .btn-text) {
  box-shadow: 0 1px 2px rgba(0,0,0,0.12), 0 2px 6px rgba(0,0,0,0.08),
              inset 0 1px 0 rgba(255,255,255,0.12);
}
:is(.btn-solid, .btn-outline, .btn-subtle, .btn-text):is(:hover, :focus-visible) {
  box-shadow: 0 4px 10px rgba(0,0,0,0.14), 0 10px 24px rgba(0,0,0,0.10),
              inset 0 1px 0 rgba(255,255,255,0.12);
}
@media (prefers-reduced-motion: no-preference) {
  :is(.btn-solid, .btn-outline, .btn-subtle, .btn-text) {
    transition: box-shadow 160ms ease, transform 160ms ease;
  }
  :is(.btn-solid, .btn-outline, .btn-subtle, .btn-text):is(:hover, :focus-visible) {
    transform: translateY(-1px);
  }
}