// reference: https://github.com/google/material-design-lite/blob/88872e672e41c56af0a78a35b34373b8c4a8c49d/src/_mixins.scss#L227

// Focus shadow mixin.
@mixin focus-shadow() {
	box-shadow: 0 0 8px rgba(0, 0, 0, 0.18), 0 8px 16px rgba(0, 0, 0, 0.36);
}

@mixin shadow-2dp() {
	box-shadow: 0 2px 2px 0 rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0 3px 1px -2px rgba(0, 0, 0, $shadow-key-umbra-opacity),
		0 1px 5px 0 rgba(0, 0, 0, $shadow-ambient-shadow-opacity);
}

@mixin shadow-3dp() {
	box-shadow: 0 3px 4px 0 rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0 3px 3px -2px rgba(0, 0, 0, $shadow-key-umbra-opacity),
		0 1px 8px 0 rgba(0, 0, 0, $shadow-ambient-shadow-opacity);
}

@mixin shadow-4dp() {
	box-shadow: 0 4px 5px 0 rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0 1px 10px 0 rgba(0, 0, 0, $shadow-ambient-shadow-opacity),
		0 2px 4px -1px rgba(0, 0, 0, $shadow-key-umbra-opacity);
}

@mixin shadow-6dp() {
	box-shadow: 0 6px 10px 0 rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0 1px 18px 0 rgba(0, 0, 0, $shadow-ambient-shadow-opacity),
		0 3px 5px -1px rgba(0, 0, 0, $shadow-key-umbra-opacity);
}

@mixin shadow-8dp() {
	box-shadow: 0 8px 10px 1px rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0 3px 14px 2px rgba(0, 0, 0, $shadow-ambient-shadow-opacity),
		0 5px 5px -3px rgba(0, 0, 0, $shadow-key-umbra-opacity);
}

@mixin shadow-16dp() {
	box-shadow: 0 16px 24px 2px rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0  6px 30px 5px rgba(0, 0, 0, $shadow-ambient-shadow-opacity),
		0  8px 10px -5px rgba(0, 0, 0, $shadow-key-umbra-opacity);
}

@mixin shadow-24dp() {
	box-shadow: 0  9px 46px  8px rgba(0, 0, 0, $shadow-key-penumbra-opacity),
		0 11px 15px -7px rgba(0, 0, 0, $shadow-ambient-shadow-opacity),
		0 24px 38px  3px rgba(0, 0, 0, $shadow-key-umbra-opacity);
}