@import url('https://fonts.googleapis.com/css?family=Open+Sans:300,400,700&subset=latin-ext');

/* ===================================
   Base Styles
   =================================== */

* {
	margin: 0;
}

body {
	margin: 0;
	background: white;
	font: 100%/1.5 "Open Sans", Helvetica Neue, sans-serif;
	text-decoration-skip: ink;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	-webkit-tap-highlight-color: rgba(255, 102, 0, 0.2);
}

h1, h2, h3, h4, h5, h6 {
	line-height: 1.25;
	margin: 1em 0 .5em;
}

h1 {
	font-size: 120%;
}

p {
	hyphens: auto;
}

a {
	color: inherit;
	text-decoration: none;
	border-bottom: 1px dotted #ccc;
}

nav a,
a[href^="#"],
article > a {
	border-bottom: none;
}

a:hover,
a:focus {
	color: hsl(20, 100%, 45%) !important;
}

.seminaryear {
	padding-top: 10px;
	color: hsl(20, 100%, 45%);
}

/* ===================================
   Header / Banner
   =================================== */

body > header {
	padding: 3.5em 1.5em 2.5em 1.5em;
	background-color: hsl(20, 100%, 45%);
	background-image: linear-gradient(rgba(0,0,0,.3), rgba(0,0,0,.5)),
	                  url("../images/social/group-meeting.jpg");
	background-position: center center !important;
	background-size: cover !important;
	background-repeat: no-repeat !important;
	background-attachment: scroll !important;
	color: white;
	text-align: center;
	font-size: 120%;
	text-shadow: 0 0 .5em rgba(0,0,0,.5);
	position: relative;
}

/* Header Navigation */
.header-nav {
	display: flex;
	padding: 0.5em 1em;
	align-items: center;
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	z-index: 2;
}

.header-nav .nav-logos {
	display: flex;
	align-items: center;
	gap: 1em;
}

.header-nav .nav-logo-link {
	display: flex;
	align-items: center;
	border-bottom: none;
}

.header-nav .nav-logo-csail {
	height: 2.5em;
	width: auto;
	filter: brightness(0) invert(1);
}

.header-nav .nav-menu {
	display: flex;
	flex: 1;
	justify-content: flex-end;
	margin: 0;
	margin-right: 2em;
	padding: 0;
	list-style: none;
	font-weight: bold;
	align-items: center;
}

.header-nav .nav-menu li {
	display: flex;
	align-items: center;
}

.header-nav .nav-menu a {
	padding: 0 .3em;
	display: inline-flex;
	align-items: center;
	line-height: 1;
	color: white;
}

body > header::after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: linear-gradient(135deg, rgba(255, 102, 0, 0.8), rgba(255, 69, 0, 0.8));
	opacity: 0;
	transition: opacity 0.3s ease;
	pointer-events: none;
	z-index: 1;
}

html.scrolled body > header::after {
	opacity: 1;
}

body > header nav,
body > header h2,
body > header .join,
body > header .header-logo {
	position: relative;
	z-index: 2;
}

/* Sticky Navigation */
.sticky-nav {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	width: 100%;
	z-index: 1001;
	display: flex;
	padding: 0.5em 1em;
	align-items: center;
	background-color: hsl(20, 100%, 45%);
	background-image: linear-gradient(rgba(0,0,0,.3), rgba(0,0,0,.5)),
	                  url("../images/social/group-meeting.jpg");
	background-position: center center;
	background-size: cover;
	color: white;
	opacity: 0;
	pointer-events: none;
	transform: translateY(-100%);
	transition: opacity 0.3s ease, transform 0.3s ease;
}

html.scrolled .sticky-nav {
	opacity: 1;
	pointer-events: auto;
	transform: translateY(0);
}

.sticky-nav::after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: linear-gradient(135deg, rgba(255, 102, 0, 0.8), rgba(255, 69, 0, 0.8));
	opacity: 0.95;
	z-index: -1;
}

.sticky-nav .nav-logos {
	display: flex;
	align-items: center;
	gap: 1em;
	position: relative;
	z-index: 2;
}

.sticky-nav .nav-logo-link {
	display: flex;
	align-items: center;
	border-bottom: none;
}

.sticky-nav .nav-logo-csail,
.sticky-nav .nav-logo-hci {
	height: 2.5em;
	width: auto;
	filter: brightness(0) invert(1);
}

.sticky-nav .nav-menu {
	display: flex;
	flex: 1;
	justify-content: flex-end;
	margin: 0;
	padding: 0;
	list-style: none;
	font-weight: bold;
	align-items: center;
	position: relative;
	z-index: 2;
}

.sticky-nav .nav-menu li {
	display: flex;
	align-items: center;
}

.sticky-nav .nav-menu a {
	padding: 0 .3em;
	display: inline-flex;
	align-items: center;
	line-height: 1;
	color: white;
	text-shadow: 0 2px 8px rgba(0,0,0,0.8);
}

.sticky-nav .nav-menu {
	margin-right: 2em;
}


body > header h2 {
	margin-top: 2em;
	margin-bottom: .4em;
	font-weight: 300;
	font-size: 300%;
}

body > header .header-logo {
	margin-top: 2em;
	margin-bottom: .4em;
	text-align: center;
}

body > header .header-logo img {
	max-width: 25%;
	height: auto;
}

body > header .header-subtitle {
	margin: 1em 0 0;
	font-size: 2rem;
	font-weight: 400;
	letter-spacing: 0.05em;
	text-transform: lowercase;
	text-shadow: 0 2px 8px rgba(0,0,0,0.8);
	display: block;
}

body > header .header-subtitle .subtitle-location {
	white-space: nowrap;
}

body > header .join {
	display: inline-block;
	padding: .4em 1em .5em;
	border: .15em solid white;
	border-radius: .3em;
	font-weight: bold;
}

body > header .join:hover {
	text-decoration: none;
	background: white;
	color: black;
	mix-blend-mode: screen;
	text-shadow: none;
}

/* Mobile header adjustments */
@media (max-width: 768px) {
	body > header {
		padding: 1.5em 1em 2em;
		min-height: 100vh;
		display: flex;
		flex-direction: column;
		justify-content: center;
	}

	body > header nav {
		display: none;
	}

	body > header .header-logo img {
		display: none;
	}

	body > header .header-subtitle {
		font-size: clamp(1.5rem, 6vw, 2rem);
		margin-top: auto;
		margin-bottom: 2em;
		font-weight: 500;
		letter-spacing: 0.05em;
	}

	body > header .header-subtitle .subtitle-main::after {
		content: '\A';
		white-space: pre;
	}

	body > header .header-logo {
		margin-top: auto;
		margin-bottom: 1em;
	}

	body > header .join {
		font-size: clamp(0.9rem, 3.5vw, 1.1rem);
		padding: .7em 1.8em .8em;
		margin-top: 1.5em;
		min-height: 44px;
		display: inline-flex;
		align-items: center;
		justify-content: center;
	}
}

@media (max-width: 400px) {
	body > header {
		padding: 0.8em 0.8em 1.5em;
	}

	body > header .header-subtitle {
		font-size: clamp(1rem, 4vw, 1.2rem);
	}

	body > header .join {
		font-size: 0.85rem;
		padding: .6em 1.5em .7em;
	}
}

/* ===================================
   Main Content Layout
   =================================== */

body > section,
body > footer {
	max-width: 60rem;
	margin: auto;
	padding: 0 1em;
}

body > section > h1 {
	position: relative;
	z-index: 1;
	color: hsl(20, 100%, 45%);
	font-weight: 300;
	font-size: 250%;
	padding-top: 1.5em;
	margin-top: 0;
	text-align: center;
}

body > section > h1 > a::before {
	content: "#";
	position: absolute;
	right: 100%;
	bottom: -.55em;
	z-index: -1;
	margin-right: -.6em;
	width: 1.2em;
	padding: .5em;
	border-radius: 50%;
	text-align: center;
	font-weight: bold;
	font-size: 120%;
	color: white;
	background: hsla(20, 100%, 85%, .75);
	transition: .4s;
}

body > section:not(:target) > h1 > a:not(:hover)::before {
	opacity: 0;
	transform: scale(0);
}

body > section > h1 > a:hover::before {
	color: inherit;
}

/* Mobile spacing adjustments */
@media (max-width: 768px) {
	body > section {
		padding: 2em 1.5em;
	}

	body > section > h1 {
		font-size: 1.8em;
		margin-bottom: 1.5em;
	}
}

/* ===================================
   People Section
   =================================== */

section.people {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 1.5em;
	row-gap: 2em;
}

section.people > h1 {
	width: 100%;
	flex-basis: 100%;
}

section.people article {
	margin: 0;
	text-align: center;
	display: flex;
	flex-direction: column;
	align-items: center;
	width: 16em;
	flex-shrink: 0;
}

section.people article a {
	display: flex;
	flex-direction: column;
	align-items: center;
	text-decoration: none;
	width: 100%;
}

section.people article h1 {
	margin: 0.5em 0 0.3em 0;
	text-align: center;
	width: 100%;
}

section.people article .group {
	display: block;
	font-weight: bold;
	color: rgba(0,0,0,.5);
	font-size: 90%;
	text-align: center;
	width: 100%;
}

section.people article img {
	width: 12em;
	height: 12em;
	aspect-ratio: 1;
	object-fit: cover;
	object-position: center;
	border-radius: 50%;
	background: #1a1a1a;
	border: 2px solid hsl(20, 100%, 60%);
	box-sizing: border-box;
	margin-bottom: 0.8em;
}

/* Faculty-specific styling */
section.people[id=faculty] article {
	max-width: 13em;
}

/* PhD students styling */
section.people[id=phds] article img {
	width: 10em;
	height: 10em;
}

section.people[id=phds] article {
	width: 10em;
}

section.people[id=phds] article .group {
	font-weight: 300;
	color: inherit;
}

/* Tablet breakpoint */
@media (max-width: 770px) {
	section.people article img {
		width: 20em;
		height: 20em;
	}

	section.people[id=phds] article img {
		width: 20em;
		height: 20em;
	}
}

/* Mobile breakpoint */
@media (max-width: 600px) {
	section.people {
		display: flex;
		flex-direction: column;
		align-items: center;
	}

	section.people article {
		width: 100%;
		max-width: 500px;
	}

	/* Faculty on mobile - horizontal layout */
	section.people[id=faculty] article {
		max-width: 100%;
		display: flex;
		flex-direction: row;
		align-items: center;
		text-align: left;
		margin: 1em 0;
	}

	section.people[id=faculty] article a {
		flex-direction: row;
	}

	section.people[id=faculty] article img {
		width: 5em;
		height: 5em;
		flex-shrink: 0;
		margin-right: 1em;
		margin-bottom: 0;
		border: 0.2em solid hsl(20, 100%, 60%);
	}

	section.people[id=faculty] article h1 {
		text-align: left;
		margin: 0;
		flex: 1;
	}

	section.people[id=faculty] article .group {
		text-align: left;
		margin: 0.3em 0 0 0;
	}

	/* PhD students on mobile - vertical layout */
	section.people[id=phds] {
		gap: 1.5em;
	}

	section.people[id=phds] article {
		max-width: 100%;
		width: 100%;
	}

	section.people[id=phds] article img {
		width: min(60vw, 280px);
		height: min(60vw, 280px);
		border: 0.2em solid hsl(20, 100%, 60%);
	}

	section.people[id=phds] article h1 {
		margin: 0.3em 0;
	}

	section.people[id=phds] article .group {
		margin: 0.3em 0 0 0;
	}
}

@media (max-width: 400px) {
	section.people[id=phds] article img {
		width: min(70vw, 250px);
		height: min(70vw, 250px);
	}

	section.people[id=faculty] article img {
		width: 4.5em;
		height: 4.5em;
	}
}

/* ===================================
   Research Section
   =================================== */

section[id="research"] article {
	margin-bottom: 2em;
}

section[id="research"] article > p {
	font-weight: 300;
	font-size: 80%;
}

section[id="research"] article footer {
	padding: .6em 1em;
	margin: 1em 0;
	border-radius: .3em;
	color: rgba(0,0,0,.5);
	font-size: 80%;
	background: hsl(20, 100%, 95%);
	max-width: fit-content;
}

section[id="research"] article footer a,
section[id="research"] article footer span[class="project"] {
	font-weight: bold;
	color: black;
}

section[id="research"] article a[href^="https://www.youtube.com"],
section[id="research"] article a.video {
	font-size: 0;
}

section[id="research"] article a[href^="https://www.youtube.com"]::before {
	content: url("images/icons/icon_youtube.png");
}

section[id="research"] article a.video::before {
	content: "📽";
	font-size: 1rem;
}

@media (max-width: 768px) {
	section[id="research"] article {
		margin-bottom: 1.5em;
	}

	section[id="research"] article footer {
		font-size: 85%;
	}
}

/* ===================================
   Classes Section
   =================================== */

section[id="classes"] {
	display: flex;
	flex-direction: column;
	align-items: center;
}

section[id="classes"] > h1 {
	width: 100%;
	text-align: center;
}

section[id="classes"] article {
	width: 100%;
	max-width: 800px;
	background: #fff;
	border: 1px solid #e0e0e0;
	border-radius: 12px;
	padding: 30px;
	margin: 20px 0;
	box-shadow: 0 2px 8px rgba(0,0,0,0.08);
	transition: box-shadow 0.2s ease;
}

section[id="classes"] article:hover {
	box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

section[id="classes"] article h1 {
	margin: 0 0 15px 0;
	font-size: 1.4em;
}

section[id="classes"] article p {
	margin: 10px 0;
	line-height: 1.6;
}

section[id="classes"] article .description {
	font-size: 95%;
	color: #555;
}

section[id="classes"] article .semester {
	display: inline-block;
	padding: 6px 12px;
	border-radius: 6px;
	background: rgba(255, 102, 0, 0.15);
	color: hsl(20, 100%, 35%);
	font-weight: 600;
	font-size: 85%;
	margin-bottom: 12px;
}

@media (max-width: 768px) {
	section[id="classes"] article {
		padding: 20px;
		margin: 15px 0;
	}

	section[id="classes"] article h1 {
		font-size: 1.3em;
	}
}

/* ===================================
   Seminar Section
   =================================== */

section[id="seminar"] > section {
	display: flex;
	flex-flow: row wrap;
	justify-content: space-between;
}

section[id="seminar"] > .info {
	display: flex;
	flex-flow: row wrap;
	justify-content: space-between;
	padding: .8em 1em;
	margin: 1em -1em;
	border-radius: .3em;
	background: hsla(220, 15%, 50%, .15);
	font-size: 95%;
}

section[id="seminar"] > .info a[title^="Where"] {
	font-weight: bold;
}

section[id="seminar"] > section > h1 {
	width: 100%;
	margin-bottom: .5em;
}

section[id="seminar"] > section > h1 a {
	display: inline-block;
	vertical-align: .2em;
	padding: .2em .5em;
	border-radius: .3em;
	background: hsl(220, 10%, 70%);
	text-transform: uppercase;
	color: white;
	font-size: 60%;
}

section[id="seminar"] > section > h1 a:hover {
	background: hsl(20, 100%, 45%);
	color: white !important;
	text-decoration: none;
}

section[id="seminar"] video {
	width: 100%;
}

section[id="seminar"] article h1 {
	margin: .3em 0;
	font-weight: 300;
	font-size: 100%;
}

section[id="seminar"] article h1 strong {
	display: block;
}

@media (min-width: 750px) {
	section[id="seminar"] article {
		width: 49%;
	}
}

@media (max-width: 800px) {
	section[id="seminar"] > .info {
		flex-flow: column;
		line-height: 2;
	}
}

/* ===================================
   Alumni Section
   =================================== */

section[id="alumni"] > section > h1 a {
	display: inline-block;
	vertical-align: .2em;
	padding: .2em .5em;
	border-radius: .3em;
	background: hsl(220, 10%, 70%);
	text-transform: uppercase;
	color: white;
	font-size: 60%;
}

section[id="alumni"] > section > h1 a:hover {
	background: hsl(20, 100%, 45%);
	color: white !important;
	text-decoration: none;
}

section[id="previous"] > article {
	padding-bottom: 10px;
}

/* ===================================
   Join Section
   =================================== */

section[id="join"] {
	background: hsl(220, 10%, 30%);
	box-shadow: -50vw 0 hsl(220, 10%, 30%), 50vw 0 hsl(220, 10%, 30%);
	padding: 1em 1em 2em;
	margin-top: 3em;
	color: white;
}

section[id="join"] > h1 {
	padding-top: 0;
}

section[id="join"] > p {
	position: relative;
	z-index: 1;
}

section[id="join"] > h1 > a:not(:hover)::before {
	background: hsla(20, 100%, 80%, .75);
	z-index: -1;
}

section[id="join"]:target > h1 > a:not(:hover)::before {
	color: hsl(220, 10%, 30%);
}

/* ===================================
   Footer
   =================================== */

body > footer {
	display: flex;
	flex-flow: row wrap;
	padding: 1em;
	background: hsl(220, 10%, 90%);
	box-shadow: -50vw 0 hsl(220, 10%, 90%), 50vw 0 hsl(220, 10%, 90%);
}

body > footer a {
	font-weight: bold;
}

body > footer a.logo {
	height: 3em;
	margin: 0 .5em;
}

body > footer a.logo > img {
	height: 100%;
}

@media (min-width: 470px) {
	body > footer > p {
		flex: 1;
	}
}

@media (max-width: 768px) {
	body > footer {
		padding: 1.5em;
		text-align: center;
		justify-content: center;
	}

	body > footer p {
		font-size: 0.9em;
		line-height: 1.6;
	}

	body > footer a.logo {
		margin: 1em 0.5em 0;
	}
}

/* ===================================
   Tables
   =================================== */

table {
	width: 100%;
	border-collapse: collapse;
}

thead {
	border-bottom: 2px solid #ddd;
}

th {
	padding: 0.4em;
}

td {
	padding: 0.9em;
}

tr:nth-child(even) {
	background-color: #f2f2f2;
}