@charset "utf-8";
/* Base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
--progress-track: rgba(0,0,0,.08);
--progress-fill: #ff6b6b;
--progress-width: 4px;
--progress-radius: 999px;
--base-font-size: 16px;
--dark-color:#2c3e50;
--red-color:#ff6b6b;
--ltblu-color:#4a90e2;
--dkblu-color:#1a3a52;
--nav-width:20vw;
}
@font-face {
  font-family: 'Material Symbols Outlined';
  font-style: normal;
  src: url(https://example.com/material-symbols.woff) format('woff');
}
html {
    scroll-behavior: smooth;
    overflow-y: scroll;
	overflow-x:hidden;
}
body {
    font-family: 'Zalando Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dkblu-color);
    background: floralwhite;
    min-height: 100vh;
    background-image: url("aie-echo-1.png");
    background-position: top right;
    background-repeat: no-repeat;
}
body#project {
    background-image: url("aie-echo-1.png"), url("aie-echo-2.png"), url("https://www.toptal.com/designers/subtlepatterns/uploads/p6.png");
    background-position: top right, 24% 12%, top left;
    background-repeat: no-repeat, no-repeat, repeat;
    background-blend-mode: multiply;
}
main {
    padding: 40px;
}

/* Main content container */
.container {
    max-width:calc(2.75 * var(--nav-width));
    margin: 0 auto 3em auto;
    background-color: white;
    padding: 80px 60px;
    border-radius: 10px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    position: relative;
    left:calc(var(--nav-width) / 2);
}
/* Typography */
.h1 {
	display:inline-flex;
    font-size: 5em;
    font-weight: 800;
    color: #1a3a52;
    line-height: 1.15;
    letter-spacing: -0.03em;
    background: -webkit-linear-gradient(155deg, var(--red-color) 12%, var(--dkblu-color) 50%);
    background-clip:text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    max-width: 66%;
}
.h1.choice {
	background: -webkit-linear-gradient(155deg, var(--ltblu-color) 25%, var(--dkblu-color) 50%);
    background-clip:text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
	text-align: center;
		max-width:100%!important;
}
h2 {  
	font-size: 2.2em;
    font-weight: 700;
    margin-top: 1.8em;
    letter-spacing: -0.01em;
}
.h2 {
    font-size: 2.2em;
    font-weight: 700;
    margin-top: 1.8em;
    margin-bottom: 0.6em;
    color: var(--red-color);
    letter-spacing: -0.01em;
    position: relative;
    padding-left: 0;
    display: flex;
    align-items: center;
    padding-left: 24px;
}
.h2::before {
    content: '|';
    position: absolute;
    left: 0;
    color: transparent;
    font-size: 1.25em;
    max-width: 6px;
    line-height: 1;
    background: linear-gradient(12deg, #ff6b6b 0%, #ff8e53 33%, #4a90e2 66%, #50c7c7 100%);
}
h2.choiceHeader {
    font-size: 4rem;
    display: flex;
    justify-content: center;
    margin-bottom: 0;
}
h2.choiceHeader:before {
    content: '';
}
h3 {
    font-size: 1.6em;
    font-weight: 600;
    margin-bottom: 0.6em;
    color: #2c5282;
    letter-spacing: -0.01em;
}
p, li {
    margin-bottom: 1.3em;
    color:var(--dkblu-color);
font-size: calc(1.05 * var(--base-font-size));
line-height: calc(2*var(--base-font-size));
    font-weight: 400;
}

ul {
    margin-left: 30px;
    margin-bottom: 1.3em;
}
li {
    margin-bottom: 0.6em;
    color:var(--dkblu-color);
}
strong {
    font-weight: bold!important;
}
footer {
    width: 100%;
    padding: 20px 20px 20px var(--nav-width);
    margin-top: 3rem;
    font-size: 14px;
    color: var(--dkblu-color);
    text-align: center;
}
#menu-toggle {
    display: none;
    position: fixed;
    width: 100%;
    height: 50px;
    top: 0;
    padding: 10px 14px;
    font-size: 18px;
    border: none;
    background: var(--red-color);
    color: #fff;
    cursor: pointer;
    z-index: 1000;
    text-transform: uppercase;
    letter-spacing: .05em;
    font-weight: 600;
}
.red {
	color:var(--red-color);
}
/* Footnote styling */
.footnote {
    cursor: pointer;
    color: #ff6b6b;
    font-weight: 600;
    font-size: 0.85em;
    user-select: none;
    line-height: 0;
}
.footnote:hover {
    background-color: #fff0f0;
    color: #ff5252;
}
/* Footnote popup */
.footnote-popup {
    position: absolute;
    background: floralwhite;
    border: 2px solid var(--dark-color);
    border-radius: 4px;
    padding: 20px;
    max-width: 400px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
    z-index: 1000;
    display: none;
    font-size: 0.95em;
    line-height: 1.6;
    color: var(--dark-color);
    font-style: italic;
    font-weight: 500;
}
.footnote-popup::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 20px;
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid #4a90e2;
}
.footnote-popup.active {
    display: block;
}
.footnote-popup a {
    color: var(--red-color);
    text-decoration: none;
    font-weight: 500;
}
.footnote-popup a:hover {
    text-decoration: underline;
}
/* Vignette styling - Card design inspired */
.vignette {
    border: 0 solid #e0e7ed;
    margin: 0 -60px 2em -60px;
	overflow:visible;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
	display: flex;
	justify-content: right;
}
.vignette-header {
    cursor: pointer;
    display: inline-flex;
    user-select: none;
	justify-content:right;
}

.vignette-header:hover .vignette-title {
    color: var(--red-color);
	transition: color ease .2s;
}
.vignette-header:hover .vignette-title:after {
    color: var(--dkblu-color);
	transition: color ease .2s;
}

.vignette-title::after {
    content: '🔎︎';
	font-size:1.1rem;
	color:var(--red-color);
	position: relative;
	margin-left:6px;
}
.vignette-title {
    font-weight: 500;
    font-size: 1em;
    color: var(--dkblu-color);
    letter-spacing: 0.02em;
	/*border-top:thin solid var(--dkblu-color);
	border-left:thin solid var(--dkblu-color);
	border-bottom:thin solid var(--dkblu-color);*/
	border-radius:50px 0 0 50px;
	padding:0 12px;
	transition: color ease .2s;
	background:linen;
	box-shadow:0 2px 2px rgba(0,0,0,.1);
}
.vignette-toggle {
    font-size: 1.4em;
    color: #1a3a52;
    font-weight: bold;
}
.vignette.collapsed .vignette-toggle {
    transform: rotate(-90deg);
}
.vignette-content:before {
		content:'X';
		font-weight:800;
		position: absolute;
		right:1vw;
		top:1vh;
		color:var(--red-color);
		font-size:1.25rem;
	}
.vignette-content {
	position:absolute;
	right:-13vw;
	max-width:calc(1.1 * var(--nav-width));
    padding: 30px;
    overflow: hidden;
    transition: right 0.4s;
    background-color:linen;
	box-shadow:0 0 12px rgba(0,0,0,.15);
	margin-top:2rem;
	border-radius:20px 0 0 20px;
}
/* Fix list alignment inside vignettes */
.vignette-content ul, .vignette-content ol {
    margin-left: 25px;
    margin-bottom: 1em;
}
.vignette-content li {
    margin-bottom: 0.8em;
}
.vignette-content p, .vignette-content ul, .vignette-content li {
	font-size:1rem;
    color:var(--dkblu-color);
    line-height: 1.5;
}
.vignette.collapsed .vignette-content {
    right:-42vw;
}
/* Path selection buttons */
.path-selector {
    margin: 3em 0 2em;
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}
.path-button {
    flex: 1;
    min-width: 250px;
    padding: 20px 25px;
    background: var(--dark-color);
    color: white;
    border: none;
    font-family: inherit;
    font-size: 1.1em;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}
.path-button h3 {
    color: white;
    font-weight: 800;
    margin: 0;
}
.path-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,.33);
    background: var(--red-color);
}
.path-button.active {
    background: var(--red-color);
}
/* Path content sections */
.path-content {
    display: none;
    animation: fadeIn 0.5s ease;
    margin-top: 2em;
    padding: 40px;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafb 100%);
    border: 2px solid #e0e7ed;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.path-content.active {
    display: block;
}
.path-content h2 {
    color: #2c5282;
    border-left: 6px solid #ff6b6b;
    padding-left: 20px;
    margin:0 0 1em 0;
}
.path-content h2::before {
    display: none;
}
.path-content h3 {
    color: #ff6b6b;
    margin-top: 1.5em;
    margin-bottom: 0.8em;
}
@keyframes fadeIn {
from {
opacity: 0;
transform: translateY(20px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
/* Special styling for notes */
em {
    color: #6b7280;
    font-style: italic;
}

/* Responsive design */
@media (max-width: 768px) {
.container {
    max-width: 95%;
    padding: 40px 30px;
}
h1 {
    font-size: 2.2em;
    padding-left: 16px;
}
h2 {
    font-size: 1.8em;
}
h3 {
    font-size: 1.4em;
}
.footnote-popup {
    max-width: 90vw;
}
.vignette-header {
    padding: 16px 20px;
}
.vignette-content {
    padding: 20px;
}
.path-selector {
    flex-direction: column;
}
.path-button {
    width: 100%;
}
.path-content {
    padding: 25px;
}
}
#toolkit {
	text-align:center;
	border-bottom:thin solid rgba(0,0,0,.15);
	padding-bottom:1rem;
	margin-bottom:3rem;
}
/* Print styles */
@media print {
body {
    background: white;
}
.container {
    max-width: 100%;
    box-shadow: none;
    padding: 40px;
}
.vignette {
    break-inside: avoid;
    border: 1px solid var(--dark-color);
}
.vignette-header {
    background: #f0f4f8;
    color: #2c5282;
}
.vignette-title {
    color: #2c5282;
}
.vignette.collapsed .vignette-content {
    height: auto !important;
    padding: 30px !important;
}
.footnote {
    color: #ff6b6b;
}
.path-button {
    page-break-inside: avoid;
}
.path-content {
    page-break-before: always;
}
}
/* Top Nav */
.navbar {
    position: sticky;
    max-height: 80px;
    margin-bottom: 2rem;
    z-index: 1000;
}
.nav-list {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap; /* allows wrapping on smaller screens */
    max-width: 500px;
    margin: 0 auto;
}
.nav-list li {
    margin: 4px 15px;
    padding: 4px;
    border-bottom: 3px solid var(--dark-color);
    transition: all 0.3s;
}
.nav-list li:hover {
    border-bottom: 3px solid var(--red-color);
}
.nav-list a {
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    color: var(--dark-color);
}
.nav-list a:hover {
    color: var(--red-color);
}
/* Floating Nav */
nav {
position:fixed;
    top:0;
    left:0;
    z-index: 1000;
    max-width: var(--nav-width);
	background:var(--dkblu-color);
	padding:40px 40px 40px 30px;
	height: 100vh;
	display:flex;
	flex-direction: column;
	align-content: space-between;
}
nav .section-head, nav .section-head a {
    text-transform: uppercase;
    font-size: 1rem;
    font-weight: 600!important;
	letter-spacing:.05em;
}
nav ul {
    list-style: none;
    margin: 0 40px 2rem 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}
nav ul#authors {
    gap: 0;
}
nav ul#authors li {
    margin-bottom: 0;
}
nav ul li {
    margin: 0 0 .5rem 0;
	font-size:var(--base-font-size);
    line-height: 150%;
}
nav ul li ul {
    gap: .25rem;
}
nav ul li ul li {
    margin: 0;
    padding-left: 12px;
}
nav a {
    text-decoration: none;
    color:linen;
    font-weight: 500;
    transition: all 0.3s;
    border-left: 0;
    padding-left: 0;
	padding-bottom: 3px;
	border-bottom: 1px solid rgba(0,0,0,0);
}
nav a:hover {
    color: #ff6b6b;
}
nav a.active {
    border-bottom: 1px solid var(--red-color);
    transition: all 0.3s;
}
nav a h3.active {
    border-left: 0;
    padding-left: 6px;
    transition: all 0.3s;
}
#nav-extra {
		margin-top:auto;
	}
#nav-extra p {
		margin-bottom:.75em;
	}
nav .logo {
	width:100%;
	margin-bottom:2em;
}
/* fixed rail on the right */
#scroll-progress {
    position: absolute;
    top: 40px;
    right: 0;                 /* nudge inward from edge */
    width: var(--progress-width);
    height: 80%;
    background: var(--progress-track);
    border-radius: var(--progress-radius);
    overflow: hidden;
    z-index: 9999;
    pointer-events: none;
}
.download-link a:before {
    font-family: 'Material Symbols Outlined';
    position: relative;
    top:3px;
    margin-right:3px;
    content:'download';
}
.download-link {
	font-size:1.1rem; font-weight:bold; margin-bottom:0;
}
.download-link a {
	text-decoration:none; color:var(--dkblu-color);
	transition: color .2s ease;
}
nav .download-link a {
	text-decoration:none; color:floralwhite;
	font-size:90%;
	transition: color .2s ease;
}
.download-btn {
    background:var(--red-color); color:white; font-weight:700; padding:1rem 2rem; border:none; border-radius: 6px; font-size:1rem; margin-bottom:3rem; cursor: pointer;
}
.download-link a:hover {
	color:var(--red-color);
}
.pullquote:before, .pullquote:after {
	color:var(--red-color);
	font-family:Garamond, serif;
	font-size:250%;
	line-height:0;
	position: relative;
	z-index: -1;
}
.pullquote:before {
	content:'\201C';
	float:left;
	top:2vh;
	left:-3vw;
}
.pullquote:after {
	content:'\201D';
	float:right;
	top:6vh;
	right:2vw;
}
.pullquote {
	font-size:2rem; font-style:italic; font-weight:300; line-height:1.25; max-width:60%; margin:4rem auto 5rem auto; padding:0; position: relative; z-index:1;
}
.pullquote strong {
	font-weight:600!important;
}
.material-symbols-outlined {
	position: relative;
	top:5px;
	padding:0 4px;
	font-size:1.5rem;
}
.disclosure-text {
		margin-top:2em;
}
.disclosure {
	display:flex;
	justify-content:left;
	align-items:flex-start;
}
.disclosure-logo {
	max-width:90px;
	margin-right:1.5em;
}
.disclosure-logo img {
	width:100%;
}
/* the filling bar */
#scroll-progress .bar {
    width: 100%;
    height: 0%;
    background: var(--progress-fill);
    transform-origin: top;
    will-change: height;
}

/* motion accessibility */
@media (prefers-reduced-motion: reduce) {
#scroll-progress .bar {
    transition: none !important;
}
}
/* Card styling */
.card-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}
.card {
    background: floralwhite;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    padding: 2rem;
	font-size: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card img {
    max-width: 150px;
	display:block;
    border-radius: 100%;
    margin:0 auto 10px auto;
}
.card h3 {
    margin-bottom: 8px;
    color: #333;
    font-size: 120%;
}
.card p {
    font-size: var(--base-font-size);
    line-height: 150%;
    margin-bottom: 15px;
	text-align: justify;
}
.card button {
    background: var(--red-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
	font-size:1rem;
	font-weight:bold;
	border:solid var(--red-color) thin;
}
.card button:hover {
    background: white;
	color:var(--red-color);
}
#resources .card {
	text-align:left;
}
#contributors .card {
	text-align:center;
}

.bio {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.4s ease;
  /* Optional: avoid clicks while hidden */
  pointer-events: none;
}

/* Expanded state: visible and tall enough for content */
.bio.expanded {
  max-height: 500px; /* large enough to cover expected content height */
  opacity: 1;
  pointer-events: auto;
}
.bio-toggle:before {
	content:'+ Read More';
}
.bio-toggle.open:before {
	content:'- Read Less';
}
/* Responsive - average laptop */
@media (max-width: 1440px) {

}

/* Responsive - small laptop */
@media (max-width: 1024px) {
h1 {
    font-size: 3em!important;
    padding-right: 0!important;
}
	p {margin-bottom: 0;}
nav {
	max-width:calc(1.5 * var(--nav-width));
}
nav ul li {
		margin:0;
	}
.container {
 max-width:calc(3.25 * var(--nav-width));
 left:calc(1.4* var(--nav-width));
	margin:0;
	}
.card-row {
    grid-template-columns: repeat(2, 1fr);
}
}

/* Responsive - tablet/mobile */
@media (max-width: 768px) {
h2 {
    line-height: 1.25!important;
}
h2:before {
    line-height: 1.5!important;
}
p {
font-size: calc(var(--base-font-size) * 1.15);
}
.container {
    max-width: 100vw!important;
    margin-top: 4rem;
    left: 0;
}
#menu-toggle {
    display: inline-flex;
    z-index: 10000;
}
#main-menu {
    display: block;
    position: fixed;
    max-width: 66vw;
    left: -67vw;
    top: 50px;
    background: white;
    padding: 10px;
    border: 1px solid #ddd;
    box-shadow: 0 24px 24px rgba(0,0,0,0.5);
    transition: all ease-out 0.3s;
}
#main-menu.show {
    display: block;
    left: 0;
    transition: all ease-out 0.3s;
}
nav {
    display: none;
    top: 0.5rem;
    padding: 0.5rem 1rem;
}
nav ul {
    flex-direction: row;
    flex-wrap: wrap;
}
nav ul li {
    width: 100%;
    padding: 8px 0;
    margin: 0;
    border-bottom: thin solid lightgray;
}
nav ul li a {
    font-size: 16px!important;
}
nav a {
    font-size: 0.9rem;
}
nav a.active {
    color: inherit!important;
}
#scroll-progress {
    display: none;
}
@media (max-width: 480px) {
main {
padding: 0;
}
h1 {
font-size: 2rem!important;
padding: 0;
}
h2 {
font-size: 1.5rem!important;
}
.container {
margin-top:50px;
border-radius: 0;
}
#main-menu {
max-width:100vw!important;
left:-100vw;
}
/* always visible on desktop */
}
.card-row {
    grid-template-columns: 1fr;
}
}