/*
  Breakpoints (reference layout): 480, 768, 1024, 1280
  Body: Source Serif 4 Light 300 — https://fonts.google.com/specimen/Source+Serif+4
  Headings & nav: stronger weight (600)
*/

:root {
	--bp-sm: 480px;
	--bp-md: 768px;
	--bp-lg: 1024px;
	--bp-xl: 1280px;

	--color-bg: #faf9f7;
	--color-text: #1a1a1a;
	--color-muted: #5c5c5c;
	--color-border: #d8d4ce;
	--color-graybox: #c8c4bc;
	--color-graybox-deep: #a8a29a;

	--font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
	--font-body-weight: 300;
	--font-strong-weight: 600;

	--space-xs: 0.35rem;
	--space-sm: 0.65rem;
	--space-md: 1rem;
	--space-lg: 1.75rem;
	--space-xl: 2.75rem;
	--space-2xl: 4rem;

	--text-base: 1rem;
	--text-lead: 1.05rem;
	--text-h1: 1.65rem;
	--text-nav: 0.95rem;

	--content-max: 100%;
	--header-pad-y: var(--space-md);
	--main-pad-x: var(--space-md);
}

@media (min-width: 480px) {
	:root {
		--text-base: 1.05rem;
		--text-lead: 1.1rem;
		--text-h1: 1.85rem;
		--text-nav: 1rem;
		--main-pad-x: 1.25rem;
		--content-max: 440px;
	}
}

@media (min-width: 768px) {
	:root {
		--text-base: 1.1rem;
		--text-lead: 1.15rem;
		--text-h1: 2.1rem;
		--text-nav: 1.02rem;
		--main-pad-x: 2rem;
		--content-max: 640px;
		--header-pad-y: var(--space-lg);
	}
}

@media (min-width: 1024px) {
	:root {
		--text-h1: 2.35rem;
		--main-pad-x: 2.5rem;
		--content-max: 720px;
	}
}

@media (min-width: 1280px) {
	:root {
		--text-base: 1.125rem;
		--text-h1: 2.5rem;
		--content-max: 760px;
	}
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

body {
	margin: 0;
	font-family: var(--font-serif);
	font-size: var(--text-base);
	font-weight: var(--font-body-weight);
	font-optical-sizing: auto;
	line-height: 1.65;
	color: var(--color-text);
	background: var(--color-bg);
}

img {
	max-width: 100%;
	height: auto;
	vertical-align: middle;
}

a {
	color: var(--color-text);
	text-underline-offset: 0.18em;
}

a:hover {
	color: var(--color-muted);
}

.skip-link {
	position: absolute;
	left: -9999px;
	top: auto;
	width: 1px;
	height: 1px;
	overflow: hidden;
}

.skip-link:focus {
	position: fixed;
	left: var(--space-md);
	top: var(--space-md);
	width: auto;
	height: auto;
	padding: var(--space-sm) var(--space-md);
	background: var(--color-text);
	color: var(--color-bg);
	z-index: 100;
}

.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

body.has-nav-open {
	overflow: hidden;
}

/* —— Header (title + mobile menu) —— */
.site-header {
	background: rgba(250, 249, 247, 0.92);
	backdrop-filter: blur(8px);
	position: relative;
	z-index: 20;
}

.site-header__inner {
	max-width: var(--bp-xl);
	margin: 0 auto;
	padding: var(--header-pad-y) var(--main-pad-x);
}

.site-title {
	margin: 0;
	font-size: var(--text-nav);
	font-weight: var(--font-strong-weight);
	letter-spacing: 0.02em;
}

.site-title a {
	text-decoration: none;
}

.site-title a:hover {
	text-decoration: underline;
}

/* Mobile menu FAB (north icon, white circle, lower-right) */
.menu-toggle {
	display: none;
	align-items: center;
	justify-content: center;
	width: 48px;
	height: 48px;
	padding: 0;
	margin: 0;
	border: none;
	border-radius: 50%;
	background: transparent;
	cursor: pointer;
	color: var(--color-text);
	box-shadow: none;
}

.menu-toggle__circle {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 48px;
	height: 48px;
	border-radius: 50%;
	background: #fff;
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.menu-toggle__icon {
	display: block;
	width: 30px;
	height: 30px;
	object-fit: contain;
}

.menu-toggle:hover .menu-toggle__circle {
	box-shadow: 0 6px 24px rgba(0, 0, 0, 0.18);
}

@media (max-width: 1023px) {
	.menu-toggle {
		display: flex;
		position: fixed;
		bottom: 1.25rem;
		right: 1.25rem;
		z-index: 150;
	}
}

@media (min-width: 1024px) {
	.menu-toggle {
		display: none !important;
	}
}

body.has-nav-open .menu-toggle {
	visibility: hidden;
	pointer-events: none;
}

/* —— Mobile drawer —— */
.mobile-nav {
	position: fixed;
	inset: 0;
	z-index: 140;
	display: flex;
	justify-content: flex-end;
}

.mobile-nav[hidden] {
	display: none;
}

.mobile-nav__backdrop {
	position: absolute;
	inset: 0;
	background: rgba(26, 26, 26, 0.35);
}

.mobile-nav__panel {
	position: relative;
	z-index: 1;
	width: min(22rem, 92vw);
	max-height: 100%;
	overflow: auto;
	background: var(--color-bg);
	border-left: 1px solid var(--color-border);
	box-shadow: -8px 0 24px rgba(0, 0, 0, 0.08);
	display: flex;
	flex-direction: column;
}

.mobile-nav__head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-md);
	padding: var(--space-md) var(--space-lg);
	border-bottom: 1px solid var(--color-border);
}

.mobile-nav__title {
	margin: 0;
	font-size: 1.1rem;
	font-weight: var(--font-strong-weight);
}

.mobile-nav__close {
	width: 2.5rem;
	height: 2.5rem;
	padding: 0;
	border: none;
	background: transparent;
	font-size: 1.75rem;
	line-height: 1;
	cursor: pointer;
	color: var(--color-text);
}

.mobile-nav__body {
	padding: var(--space-lg);
}

/* —— Nav stacks (footer + drawer) —— */
.nav-stack__list {
	list-style: none;
	margin: 0;
	padding: 0;
}

.nav-stack__item {
	margin: 0 0 var(--space-sm);
}

.nav-stack__link,
.nav-stack__link:visited,
.nav-stack__link:active {
	font-weight: var(--font-body-weight);
	font-size: var(--text-nav);
	text-decoration: none;
	letter-spacing: 0.01em;
}

.nav-stack__link:hover {
	text-decoration: none;
	color: var(--color-muted);
}

.nav-stack__link.is-active,
.nav-stack__link[aria-current="page"] {
	font-weight: 400;
	text-decoration: none;
}

.nav-stack__link:focus-visible {
	outline: 2px solid var(--color-text);
	outline-offset: 3px;
}

/* —— Mega footer (two link columns + contact) —— */
.mega-footer {
	--mega-footer-fg: rgba(255, 255, 255, 0.9);
	--mega-footer-fg-muted: rgba(255, 255, 255, 0.68);
	--mega-footer-fg-strong: #fff;

	border-top: none;
	margin-top: var(--space-2xl);
	color: var(--mega-footer-fg);
	background-color: #0a0612;
	background-image: url("/assets/images/megafooter-panoramic.jpg");
	background-size: cover;
	background-position: center;
	background-repeat: no-repeat;
	min-height: 12rem;
}

@media (min-width: 768px) {
	.mega-footer {
		min-height: 14rem;
	}
}

.mega-footer__inner {
	max-width: var(--bp-xl);
	margin: 0 auto;
	padding: var(--space-xl) var(--main-pad-x) var(--space-lg);
}

.mega-footer .nav-stack__link,
.mega-footer .nav-stack__link:visited,
.mega-footer .nav-stack__link:active {
	color: var(--mega-footer-fg);
}

.mega-footer .nav-stack__link:hover {
	color: var(--mega-footer-fg-muted);
}

.mega-footer .nav-stack__link.is-active,
.mega-footer .nav-stack__link[aria-current="page"] {
	color: var(--mega-footer-fg-strong);
	font-weight: 400;
}

.mega-footer .nav-stack__link:focus-visible {
	outline-color: var(--mega-footer-fg-strong);
}

.mega-footer__grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-xl);
}

@media (min-width: 768px) and (max-width: 1023px) {
	.mega-footer__grid {
		grid-template-columns: repeat(2, 1fr);
	}

	.mega-footer__block--utility {
		grid-column: 1 / -1;
		max-width: 18rem;
	}
}

@media (min-width: 1024px) {
	.mega-footer__grid {
		grid-template-columns: repeat(3, 1fr);
		align-items: start;
	}
}

.mega-footer__block {
	min-height: 1px;
}

/* —— Contact / bio / CV layout —— */
.contact-layout,
.profile-layout {
	max-width: var(--bp-xl);
	margin: 0 auto;
	display: grid;
	gap: var(--space-xl);
}

@media (min-width: 768px) {
	.contact-layout,
	.profile-layout {
		grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
		align-items: start;
	}
}

.contact-layout__visual,
.profile-layout__visual {
	max-width: 28rem;
}

.contact-layout__img,
.profile-layout__img {
	width: 100%;
	height: auto;
	border-radius: 2px;
	border: 1px solid var(--color-border);
}

.contact-layout__placeholder,
.profile-layout__placeholder {
	min-height: 12rem;
}

.contact-layout__text,
.profile-layout__text {
	max-width: none;
	margin: 0;
}

.section-tagline {
	margin: var(--space-sm) 0 0;
	font-size: var(--text-lead);
	font-weight: var(--font-body-weight);
	color: var(--color-muted);
	max-width: var(--content-max);
}

.cv-heading {
	margin: var(--space-lg) 0 var(--space-sm);
	font-size: 1.05rem;
	font-weight: var(--font-strong-weight);
}

.cv-block {
	margin-bottom: var(--space-md);
}

.cv-download {
	margin-top: var(--space-lg);
}

/* —— Main —— */
.main {
	max-width: var(--bp-xl);
	margin: 0 auto;
	padding: var(--space-xl) var(--main-pad-x) var(--space-2xl);
}

@media (max-width: 1023px) {
	.main {
		padding-bottom: calc(var(--space-2xl) + 3.25rem);
	}
}

.section-header {
	max-width: var(--content-max);
	margin: 0 auto var(--space-lg);
}

.section-title {
	margin: 0;
	font-size: var(--text-h1);
	font-weight: var(--font-strong-weight);
	line-height: 1.2;
	letter-spacing: -0.02em;
}

.section-intro {
	max-width: var(--content-max);
	margin: 0 auto var(--space-xl);
}

.prose {
	max-width: var(--content-max);
	margin: 0 auto;
}

.prose p {
	margin: 0 0 var(--space-md);
}

.prose ul,
.prose ol {
	margin: 0 0 var(--space-md);
	padding-left: 1.25em;
}

.prose li {
	margin-bottom: var(--space-xs);
}

.prose a {
	font-weight: var(--font-strong-weight);
}

/* —— Home hero graybox —— */
.hero-gray {
	width: 100%;
	max-width: var(--content-max);
	margin: 0 auto var(--space-xl);
	aspect-ratio: 16 / 9;
	background: linear-gradient(
		145deg,
		var(--color-graybox) 0%,
		var(--color-graybox-deep) 55%,
		#b0aaa2 100%
	);
	border: 1px solid var(--color-border);
	border-radius: 2px;
}

/* —— Gray placeholder grid —— */
.gray-grid {
	list-style: none;
	margin: var(--space-lg) auto 0;
	padding: 0;
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-lg);
	max-width: var(--bp-xl);
}

@media (min-width: 480px) {
	.gray-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 768px) {
	.gray-grid {
		grid-template-columns: repeat(2, 1fr);
		gap: var(--space-xl);
	}
}

@media (min-width: 1024px) {
	.gray-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

@media (min-width: 1280px) {
	.gray-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

.gray-grid__cell {
	display: flex;
	flex-direction: column;
	gap: var(--space-sm);
}

.gray-card {
	width: 100%;
	aspect-ratio: 4 / 3;
	background: linear-gradient(
		160deg,
		var(--color-graybox) 0%,
		#bab4ac 40%,
		var(--color-graybox-deep) 100%
	);
	border: 1px solid var(--color-border);
	border-radius: 2px;
}

.gray-card__caption {
	font-size: 0.82rem;
	font-weight: var(--font-body-weight);
	color: var(--color-muted);
}

/* —— Library publications (embed + library index) —— */
.library-publications {
	margin: var(--space-xl) auto 0;
	max-width: var(--bp-xl);
	padding: 0 var(--main-pad-x);
}

.library-list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: var(--space-xl);
}

.library-list__item {
	display: flex;
	flex-direction: column;
	gap: var(--space-md);
}

@media (min-width: 640px) {
	.library-list__item {
		flex-direction: row;
		align-items: flex-start;
		gap: var(--space-lg);
	}
}

.library-list__thumb {
	flex-shrink: 0;
	width: 8rem;
	max-width: 40%;
}

@media (min-width: 640px) {
	.library-list__thumb {
		width: 10rem;
		max-width: none;
	}
}

.library-list__thumb-img {
	display: block;
	width: 100%;
	height: auto;
	border: 1px solid var(--color-border);
	border-radius: 2px;
}

.library-list__body {
	min-width: 0;
	flex: 1;
}

.library-list__title {
	margin: 0 0 var(--space-xs);
	font-size: var(--text-h1);
	font-weight: var(--font-strong-weight);
	line-height: 1.25;
	letter-spacing: -0.02em;
}

.library-list__title p {
	margin: 0;
}

.library-list__meta {
	margin: 0 0 var(--space-sm);
	font-size: 0.92rem;
	color: var(--color-muted);
}

.library-list__desc {
	margin-top: var(--space-sm);
}

.library-grid {
	list-style: none;
	margin: 0;
	padding: 0;
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-xl);
}

@media (min-width: 640px) {
	.library-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 1024px) {
	.library-grid {
		grid-template-columns: repeat(3, 1fr);
		gap: var(--space-2xl);
	}
}

.library-grid__item {
	display: flex;
	flex-direction: column;
	gap: var(--space-sm);
}

.library-grid__image-wrap {
	position: relative;
	width: 100%;
	border: 1px solid var(--color-border);
	border-radius: 2px;
	overflow: hidden;
	background: var(--color-graybox);
}

.library-grid__image {
	display: block;
	width: 100%;
	height: auto;
}

.library-grid__placeholder {
	width: 100%;
	aspect-ratio: 3 / 4;
	background: linear-gradient(
		160deg,
		var(--color-graybox) 0%,
		var(--color-graybox-deep) 100%
	);
	border-radius: 2px;
}

.library-grid__caption {
	font-size: var(--text-nav);
	font-weight: var(--font-body-weight);
	line-height: 1.35;
}

.library-grid__caption p {
	margin: 0;
}

.main--library .section-intro {
	margin-bottom: var(--space-lg);
}

.library-publication-detail {
	max-width: var(--content-max);
	margin: 0 auto;
	padding: 0 var(--main-pad-x) var(--space-2xl);
}

.library-publication-detail__meta {
	margin: var(--space-sm) 0 0;
	font-size: 0.95rem;
	color: var(--color-muted);
}

.library-publication-detail__figures {
	list-style: none;
	margin: var(--space-lg) 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: var(--space-lg);
}

.library-publication-detail__img {
	display: block;
	width: 100%;
	height: auto;
	border: 1px solid var(--color-border);
	border-radius: 2px;
}

/* —— Footer note —— */
.site-footer {
	max-width: var(--bp-xl);
	margin: 0 auto;
	padding: var(--space-md) var(--main-pad-x) var(--space-xl);
	border-top: 1px solid var(--color-border);
}

.site-footer__note {
	margin: 0;
	font-size: 0.88rem;
	color: var(--color-muted);
	font-weight: var(--font-body-weight);
}