first commit

wp-content/themes/aac/css/_mixins.scss

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+$container-max-widths: (
+	sm: 540px,
+	md: 720px,
+	lg: 960px,
+	xl: 1140px,
+	xxl: 1370px,
+);
+
+$breakpoints: (
+	sm: 576px,
+	md: 768px,
+	lg: 992px,
+	xl: 1200px,
+	xxl: 1400px,
+);
+
+@mixin respond-above($breakpoint) {
+	@if map-has-key($breakpoints, $breakpoint) {
+		$breakpoint-value: map-get($breakpoints, $breakpoint);
+		@media (min-width: $breakpoint-value) {
+			@content;
+		}
+	} @else {
+		@warn 'Invalid breakpoint: #{$breakpoint}.';
+	}
+}
+@mixin respond-below($breakpoint) {
+	@if map-has-key($breakpoints, $breakpoint) {
+		$breakpoint-value: map-get($breakpoints, $breakpoint);
+		@media (max-width: ($breakpoint-value - 1)) {
+			@content;
+		}
+	} @else {
+		@warn 'Invalid breakpoint: #{$breakpoint}.';
+	}
+}
+@mixin respond-between($lower, $upper) {
+	@if map-has-key($breakpoints, $lower) and map-has-key($breakpoints, $upper) {
+		$lower-breakpoint: map-get($breakpoints, $lower);
+		$upper-breakpoint: map-get($breakpoints, $upper);
+		@media (min-width: $lower-breakpoint) and (max-width: ($upper-breakpoint - 1)) {
+			@content;
+		}
+	} @else {
+		@if (map-has-key($breakpoints, $lower) == false) {
+			@warn 'Your lower breakpoint was invalid: #{$lower}.';
+		}
+		@if (map-has-key($breakpoints, $upper) == false) {
+			@warn 'Your upper breakpoint was invalid: #{$upper}.';
+		}
+	}
+}

wp-content/themes/aac/css/_reset.scss

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+// reset everything
+*,
+*::before,
+*::after {
+	box-sizing: border-box;
+}
+
+* {
+	margin: 0;
+	padding: 0;
+	border: 0 solid transparent;
+}
+
+// prevent iOS font size change
+html {
+	-webkit-text-size-adjust: 100%;
+}
+
+// reset body line-height
+body {
+	min-height: 100vh;
+	line-height: 1;
+	text-rendering: optimizeSpeed;
+}
+
+// all media elements set to block and full width
+img,
+svg,
+video,
+canvas,
+audio,
+iframe,
+embed,
+object {
+	display: block;
+	max-width: 100%;
+}
+
+// inherit fonts for inputs and buttons
+input,
+button,
+textarea,
+select {
+	font: inherit;
+	line-height: inherit;
+	color: inherit;
+}
+
+// collapse table
+table {
+	border-collapse: collapse;
+	border-spacing: 0;
+}
+
+// assign button hover state
+button,
+[role='button'] {
+	cursor: pointer;
+	background-color: transparent;
+	-webkit-tap-highlight-color: transparent;
+	&:focus {
+		outline: 0;
+	}
+}
+
+// reset anchor style
+a {
+	cursor: pointer;
+	color: inherit;
+	text-decoration: inherit;
+	-webkit-tap-highlight-color: transparent;
+}
+
+// reset heading style
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+	font-size: inherit;
+	font-weight: inherit;
+}
+
+// reset list style
+ol,
+ul {
+	list-style: none;
+}
+
+// reset text input style
+[type='date'],
+[type='datetime'],
+[type='datetime-local'],
+[type='email'],
+[type='month'],
+[type='number'],
+[type='password'],
+[type='search'],
+[type='tel'],
+[type='text'],
+[type='time'],
+[type='url'],
+[type='week'],
+textarea,
+select {
+	-webkit-appearance: none;
+	-moz-appearance: none;
+	appearance: none;
+	width: 100%;
+	&:focus {
+		outline: 0;
+	}
+}
+
+// reset firefox placeholder opacity
+::-moz-placeholder {
+	opacity: 1;
+}
+
+// reset textarea style
+textarea {
+	// move the label to the top
+	vertical-align: top;
+
+	// turn off scroll bars in IE unless needed
+	overflow: auto;
+}
+
+// reset checkbox and radio style
+[type='checkbox'],
+[type='radio'] {
+	-webkit-appearance: none;
+	-moz-appearance: none;
+	appearance: none;
+	&:focus {
+		outline: 0;
+	}
+}
+
+// remove all animations, transitions and smooth scroll for people that prefer not to see them
+@media (prefers-reduced-motion: reduce) {
+	html:focus-within {
+		scroll-behavior: auto;
+	}
+
+	*,
+	*::before,
+	*::after {
+		animation-duration: 0.01ms !important;
+		animation-iteration-count: 1 !important;
+		transition-duration: 0.01ms !important;
+		scroll-behavior: auto !important;
+	}
+}