:root {
	--bg: #0d2233;
	--fg: #e8edf2;
	--muted: #94a3b8;
	--line: rgba(232, 237, 242, .12);
	--link: #e8edf2;
	--max: 760px;
	--gap: 42px;
	--pad: 34px;
	--radius: 10px;
	--focus: rgba(232, 237, 242, .3);
}

:root[data-theme="light"] {
	--bg: #f8f9fa;
	--fg: #1a1a1a;
	--muted: #6c757d;
	--line: rgba(26, 26, 26, .12);
	--link: #18425e;
	--focus: rgba(1, 17, 31, .25);
}

* {
	box-sizing: border-box;
}

::-webkit-scrollbar {
	display: none;
}

html {
	-ms-overflow-style: none;
	scrollbar-width: none;
}

html,
body {
	height: 100%;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--fg);
	font: 16px/1.6 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
	letter-spacing: 0.01em;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

a {
	color: var(--link);
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

.shell {
	min-height: 100%;
	display: grid;
	grid-template-columns: 260px 1fr;
	gap: var(--gap);
	padding: var(--pad);
}

.side {
	position: sticky;
	top: var(--pad);
	align-self: start;
	display: flex;
	flex-direction: column;
	gap: 20px;
}

.identity .name {
	font-weight: 650;
	font-size: 20px;
	line-height: 1.2;
}

.identity .affil {
	color: var(--muted);
	margin-top: 4px;
}

.nav {
	display: flex;
	flex-direction: column;
	gap: 6px;
	margin-top: 10px;
}

.tab {
	color: var(--muted);
	padding: 6px 0;
	border-radius: 8px;
	width: fit-content;
	font-weight: 400;
	transition: color 0.2s ease, font-weight 0.1s ease;
}

.tab:hover {
	color: var(--fg);
	text-decoration: none;
}

.tab[aria-current="page"] {
	color: var(--fg);
	font-weight: 600;
}

.tab:focus-visible {
	outline: 2px solid var(--focus);
	outline-offset: 2px;
}

.email {
	color: var(--muted);
	width: fit-content;
	margin-top: 4px;
}

.contacts {
	margin-top: 10px;
}

.contacts summary {
	cursor: pointer;
	color: var(--muted);
	padding: 6px 0;
	border-radius: 8px;
	width: fit-content;
	list-style: none;
	transition: color 0.2s ease;
	display: flex;
	align-items: center;
}

.contacts summary:hover {
	color: var(--fg);
}

.contact-list {
	list-style: none;
	padding: 0;
	margin: 0;
	padding-left: 11px;
}

.contact-list>div {
	display: flex;
	flex-direction: column;
	gap: 4px;
	overflow: hidden;
	height: 0;
	transition: height 0.28s cubic-bezier(0.4, 0, 0.2, 1), padding-top 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.contacts[open] .contact-list>div {
	padding-top: 8px;
}

.contact-list>div>* {
	opacity: 0;
	transition: opacity 0.22s cubic-bezier(0.4, 0, 0.2, 1) 0.04s;
}

.contacts[open] .contact-list>div>* {
	opacity: 1;
}

.contact-list a {
	color: var(--muted);
	font-size: 15px;
	transition: color 0.2s ease;
}

.contact-list a:hover {
	color: var(--fg);
}

.main {
	max-width: var(--max);
	padding-top: 4px;
}

.main:focus {
	outline: none;
}

.main h1 {
	font-size: 20px;
	font-weight: 650;
	margin: 0 0 12px;
}

.main h2 {
	font-size: 16px;
	font-weight: 650;
	margin: 26px 0 10px;
}

.main p {
	margin: 0 0 16px;
	color: var(--fg);
}

.main p + p {
	margin-top: 8px;
}

.main .muted {
	color: var(--muted);
}

.list {
	margin: 12px 0 0;
	padding: 0;
	list-style: none;
	border-top: 1px solid var(--line);
}

.list li {
	padding: 12px 0;
	border-bottom: 1px solid var(--line);
}

.item-title {
	font-weight: 600;
}

.item-meta {
	color: var(--muted);
}

.work-intro {
	margin-bottom: 32px;
}

.work-intro p {
	color: var(--muted);
	margin: 0;
}

.projects-section,
.courses-section,
.youtube-section {
	margin-top: 26px;
}

.projects-toggle,
.courses-toggle,
.youtube-toggle {
	cursor: pointer;
	list-style: none;
	display: flex;
	align-items: center;
	user-select: none;
}

.contacts summary::-webkit-details-marker,
.projects-toggle::-webkit-details-marker,
.courses-toggle::-webkit-details-marker,
.youtube-toggle::-webkit-details-marker {
	display: none;
}

.contacts summary::before,
.projects-toggle::before,
.courses-toggle::before,
.youtube-toggle::before {
	content: '';
	display: inline-block;
	width: 0;
	height: 0;
	border-left: 5px solid currentColor;
	border-top: 4px solid transparent;
	border-bottom: 4px solid transparent;
	margin-right: 6px;
	transition: transform 0.2s ease;
	flex-shrink: 0;
}

.contacts[open] summary::before,
.projects-section[open] .projects-toggle::before,
.courses-section[open] .courses-toggle::before,
.youtube-section[open] .youtube-toggle::before {
	transform: rotate(90deg);
}

.projects-content,
.courses-content,
.youtube-content {
	overflow: hidden;
}

.projects-content>div,
.courses-content>div,
.youtube-content>div {
	height: 0;
	overflow: hidden;
	transition: height 0.3s ease;
}

.projects-content>div>*,
.courses-content>div>*,
.youtube-content>div>* {
	opacity: 0;
	transition: opacity 0.2s ease;
}

.projects-section[open] .projects-content>div>*,
.courses-section[open] .courses-content>div>*,
.youtube-section[open] .youtube-content>div>* {
	opacity: 1;
	margin-top: 12px;
}

.youtube-desc {
	color: var(--muted);
	margin: 0 0 10px;
	font-size: 15px;
}

.youtube-link {
	font-size: 15px;
	color: var(--muted);
	transition: color 0.2s ease;
}

.youtube-link:hover {
	color: var(--fg);
	text-decoration: none;
}

.projects-grid {
	display: grid;
	gap: 16px;
}

.project-card {
	position: relative;
	padding: 16px;
	border: 1px solid var(--line);
	border-radius: 8px;
	transition: border-color 0.2s ease;
}

.project-card:hover {
	border-color: var(--muted);
}

.project-link {
	position: absolute;
	top: 16px;
	right: 16px;
	color: var(--muted);
	transition: color 0.2s ease;
	display: flex;
	align-items: center;
	justify-content: center;
}

.project-link:hover {
	color: var(--fg);
	text-decoration: none;
}

.project-header {
	display: flex;
	justify-content: space-between;
	align-items: baseline;
	margin-bottom: 8px;
}

.project-header h3 {
	font-size: 16px;
	font-weight: 600;
	margin: 0;
	color: var(--fg);
}

.project-desc {
	color: var(--muted);
	margin: 0 0 12px;
	font-size: 15px;
}

.project-tags {
	display: flex;
	gap: 8px;
	flex-wrap: wrap;
}

.tag {
	font-size: 13px;
	color: var(--muted);
	padding: 4px 10px;
	border-radius: 4px;
	background: rgba(148, 163, 184, 0.08);
}

.courses-list {
	display: flex;
	flex-direction: column;
	gap: 24px;
}

.semester-group {
	display: flex;
	flex-direction: column;
	gap: 8px;
}

.semester-label {
	font-size: 14px;
	color: var(--muted);
	margin: 0 0 4px;
	font-weight: 600;
}

.course-item {
	display: flex;
	align-items: baseline;
	gap: 10px;
	padding: 6px 0;
}

.course-code {
	font-size: 14px;
	font-weight: 600;
	color: var(--fg);
	flex-shrink: 0;
	min-width: 72px;
}

.course-code:hover {
	color: var(--link);
	text-decoration: none;
}

.course-item:hover .course-code {
	text-decoration: underline;
}

.course-name {
	font-size: 15px;
	color: var(--muted);
}

@media (max-width: 860px) {
	.shell {
		grid-template-columns: 1fr;
		row-gap: 0;
	}

	.side {
		position: static;
		flex-direction: row;
		flex-wrap: wrap;
		gap: 10px 18px;
		align-items: baseline;
	}

	.nav {
		flex-direction: row;
		flex-wrap: wrap;
		margin-top: 0;
	}

	.main {
		padding-top: 0;
	}

	.contacts {
		display: flex;
		flex-direction: row;
		align-items: center;
		gap: 14px;
		flex-basis: 100%;
		margin-top: 0;
	}

	.contact-list {
		padding-left: 0;
		margin: 0;
	}

	.contact-list>div {
		flex-direction: row;
		gap: 14px;
		align-items: center;
		height: auto !important;
		overflow: visible;
		padding-top: 0 !important;
		opacity: 0;
		transform: translateX(-8px);
		transition: opacity 0.22s ease, transform 0.22s ease;
		pointer-events: none;
	}

	.contact-list>div>* {
		opacity: 1;
		transition: none;
	}

	.contacts.is-open .contact-list>div {
		opacity: 1;
		transform: translateX(0);
		pointer-events: auto;
	}

	.contacts.is-open .contact-list>div[data-closing] {
		opacity: 0;
		transform: translateX(-8px);
	}
}

.last-updated {
	position: fixed;
	bottom: 45px;
	left: 78px;
	transform: translateY(50%);
	font-size: 12px;
	color: var(--muted);
	opacity: 0.55;
	pointer-events: none;
	user-select: none;
}

.theme-toggle {
	position: fixed;
	bottom: 24px;
	left: 24px;
	width: 42px;
	height: 42px;
	border-radius: 50%;
	border: none;
	background: transparent;
	color: var(--fg);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: all 0.2s ease;
	z-index: 100;
	padding: 0;
}

.theme-toggle:hover {
	color: var(--link);
	transform: scale(1.08);
}

.theme-toggle:focus-visible {
	outline: 2px solid var(--focus);
	outline-offset: 2px;
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
	position: absolute;
	transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-toggle .sun-icon {
	opacity: 1;
	transform: rotate(0deg) scale(1);
}

.theme-toggle .moon-icon {
	opacity: 0;
	transform: rotate(90deg) scale(0.5);
}

:root[data-theme="light"] .theme-toggle .sun-icon {
	opacity: 0;
	transform: rotate(-90deg) scale(0.5);
}

:root[data-theme="light"] .theme-toggle .moon-icon {
	opacity: 1;
	transform: rotate(0deg) scale(1);
}