/* ------------------------------------------------------------------
   Abdullah Al Shafi, academic homepage
   Palette: warm paper, deep ink, one blue accent, one warm accent kept
   for honours (the oral badge). Every foreground/background pair below
   was checked for WCAG AA contrast in both themes.
   ------------------------------------------------------------------ */

:root {
	--bg: #fbfaf7;
	--surface: #ffffff;
	--ink: #1c1f24;
	--muted: #5b6370;
	--line: #e6e2d9;
	--accent: #1d5c88;
	--accent-soft: #e7eff6;
	--honour: #a8461f;
	--honour-soft: #f7e9e2;
	--shadow: 0 1px 2px rgba(20, 24, 31, 0.04), 0 6px 18px rgba(20, 24, 31, 0.06);
	--shadow-lift: 0 2px 4px rgba(20, 24, 31, 0.05), 0 14px 32px rgba(20, 24, 31, 0.10);

	--serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
	--sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

	--measure: 880px;
	--radius: 12px;
	color-scheme: light;
}

:root[data-theme="dark"] {
	--bg: #111418;
	--surface: #171b21;
	--ink: #e6e8eb;
	--muted: #9ba3ad;
	--line: #272d35;
	--accent: #7db4de;
	--accent-soft: #1b2a37;
	--honour: #e6946b;
	--honour-soft: #33231b;
	--shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 18px rgba(0, 0, 0, 0.25);
	--shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.35), 0 14px 32px rgba(0, 0, 0, 0.35);
	color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--bg: #111418;
		--surface: #171b21;
		--ink: #e6e8eb;
		--muted: #9ba3ad;
		--line: #272d35;
		--accent: #7db4de;
		--accent-soft: #1b2a37;
		--honour: #e6946b;
		--honour-soft: #33231b;
		--shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 18px rgba(0, 0, 0, 0.25);
		--shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.35), 0 14px 32px rgba(0, 0, 0, 0.35);
		color-scheme: dark;
	}
}

/* ------------------------------------------------------------ base */

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

html { scroll-behavior: smooth; }

body {
	margin: 0 auto;
	max-width: var(--measure);
	padding: 0 24px 48px;
	background: var(--bg);
	color: var(--ink);
	font-family: var(--sans);
	font-size: 16.5px;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	overflow-wrap: break-word;
	transition: background-color 0.25s ease, color 0.25s ease;
}

a {
	color: var(--accent);
	text-decoration: none;
	background-image: linear-gradient(currentColor, currentColor);
	background-size: 0% 1px;
	background-position: 0 100%;
	background-repeat: no-repeat;
	transition: background-size 0.25s ease, color 0.2s ease;
}
a:hover, a:focus-visible { background-size: 100% 1px; }
a:focus-visible, button:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
	border-radius: 3px;
}

::selection { background: var(--accent-soft); }

/* ------------------------------------------------------------ header */

.hero {
	display: grid;
	grid-template-columns: 168px 1fr;
	gap: 36px;
	align-items: center;
	padding: 48px 0 8px;
}

#profile_pic {
	width: 168px;
	height: 168px;
	border-radius: 50%;
	object-fit: cover;
	box-shadow: 0 0 0 4px var(--surface), 0 0 0 5px var(--line), var(--shadow);
}

h1 {
	margin: 0;
	font-family: var(--serif);
	font-weight: 600;
	font-size: 2.45rem;
	line-height: 1.1;
	letter-spacing: -0.01em;
}

.tagline {
	margin: 8px 0 14px;
	color: var(--muted);
	font-size: 1rem;
}

.links { display: flex; flex-direction: column; gap: 2px; font-size: 0.93rem; }
.links_row { color: var(--line); }
.links_row a { color: var(--accent); }

#theme_toggle {
	margin-left: 10px;
	width: 30px;
	height: 30px;
	border: 1px solid var(--line);
	border-radius: 50%;
	background: var(--surface);
	color: var(--ink);
	cursor: pointer;
	font-size: 0.95rem;
	line-height: 1;
	vertical-align: middle;
	transition: transform 0.3s ease, border-color 0.2s ease;
}
#theme_toggle:hover { transform: rotate(20deg); border-color: var(--accent); }

.bio { margin-top: 18px; }
.bio p { margin: 0 0 14px; }

/* ------------------------------------------------------------ headings */

h2 {
	margin: 44px 0 18px;
	font-family: var(--serif);
	font-weight: 600;
	font-size: 1.55rem;
	letter-spacing: -0.005em;
	display: flex;
	align-items: center;
	gap: 14px;
}
h2::after {
	content: "";
	flex: 1;
	height: 1px;
	background: var(--line);
}

.legend { color: var(--muted); font-size: 0.88rem; margin: -8px 0 14px; }

/* ------------------------------------------------------------ tables (news, education, awards) */

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; vertical-align: top; padding: 9px 0; border-bottom: 1px solid var(--line); }
tr:last-child th, tr:last-child td { border-bottom: none; }
th {
	width: 104px;
	padding-right: 18px;
	color: var(--muted);
	font-weight: 500;
	font-size: 0.86rem;
	font-variant-numeric: tabular-nums;
	white-space: nowrap;
	padding-top: 11px;
}

/* ------------------------------------------------------------ publication cards */

.pub_list { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }

.pub_list > li {
	display: grid;
	grid-template-columns: 300px 1fr;
	gap: 22px;
	align-items: start;
	padding: 14px;
	background: var(--surface);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
	transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.pub_list > li:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-lift);
	border-color: var(--accent);
}

.pub_thumb:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
}

.pub_thumb {
	width: 100%;
	aspect-ratio: 16 / 9;
	object-fit: cover;
	display: block;
	border-radius: 8px;
	background: var(--accent-soft);
	cursor: zoom-in;
}

.pub_text { font-size: 0.95rem; line-height: 1.55; }
.pub_text b {
	display: block;
	margin-bottom: 4px;
	font-family: var(--serif);
	font-size: 1.06rem;
	line-height: 1.35;
	font-weight: 600;
	color: var(--ink);
}
/* the title is already a block, so the <br> after it would add a blank line */
.pub_text b + br { display: none; }
.pub_text u { text-decoration: none; font-weight: 600; color: var(--ink); border-bottom: 1.5px solid var(--accent); }

/* venue as a pill: the <i> directly inside each entry */
.pub_text > i {
	display: inline-block;
	margin: 8px 0 6px;
	padding: 1px 10px;
	border-radius: 999px;
	background: var(--accent-soft);
	color: var(--accent);
	font-style: normal;
	font-weight: 600;
	font-size: 0.8rem;
	letter-spacing: 0.02em;
}

.oral-badge {
	display: inline-block;
	margin-left: 6px;
	padding: 1px 10px;
	border-radius: 999px;
	background: var(--honour-soft);
	color: var(--honour);
	font-weight: 700;
	font-size: 0.78rem;
	letter-spacing: 0.04em;
	text-transform: uppercase;
}

/* ------------------------------------------------------------ plain lists */

ul:not(.pub_list) { padding-left: 1.1em; }
ul:not(.pub_list) li { margin-bottom: 10px; }
ul:not(.pub_list) li::marker { color: var(--accent); }
ul:not(.pub_list) li b { font-weight: 600; }
ul:not(.pub_list) li i { color: var(--muted); font-style: italic; }

/* ------------------------------------------------------------ footer + back to top */

footer {
	margin-top: 56px;
	padding-top: 20px;
	border-top: 1px solid var(--line);
	color: var(--muted);
	font-size: 0.86rem;
	text-align: center;
}

#to_top {
	position: fixed;
	right: 24px;
	bottom: 24px;
	z-index: 20;
	width: 44px;
	height: 44px;
	border-radius: 50%;
	border: 1px solid var(--line);
	background: var(--surface);
	color: var(--muted);
	box-shadow: var(--shadow);
	cursor: pointer;
	font-size: 1rem;
	line-height: 1;
	display: grid;
	place-items: center;
	opacity: 0;
	transform: translateY(14px) scale(0.85);
	pointer-events: none;
	transition: opacity 0.3s ease,
	            transform 0.4s cubic-bezier(0.2, 0.9, 0.25, 1),
	            color 0.2s ease, border-color 0.2s ease, box-shadow 0.25s ease;
}

/* how far down the page you are, drawn as a ring around the button. The
   conic gradient is clipped to a 3px band by the radial mask. */
#to_top::before {
	content: "";
	position: absolute;
	inset: -5px;
	border-radius: 50%;
	background: conic-gradient(var(--accent) calc(var(--progress, 0) * 1%), transparent 0);
	-webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
	mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
	opacity: 0.9;
	pointer-events: none;
}

#to_top span {
	display: block;
	transition: transform 0.28s cubic-bezier(0.2, 0.9, 0.25, 1);
}

#to_top.show { opacity: 1; transform: none; pointer-events: auto; }

#to_top:hover {
	color: var(--accent);
	border-color: var(--accent);
	box-shadow: var(--shadow-lift);
}
#to_top:hover span { transform: translateY(-3px); }
#to_top:active { transform: scale(0.93); }

/* ------------------------------------------------------------ lightbox
   Clicking a teaser opens it here rather than in native fullscreen: the
   page stays visible behind, and Escape closes it. */

#lightbox {
	position: fixed;
	inset: 0;
	z-index: 100;
	display: grid;
	place-items: center;
	padding: 24px;
	background: rgba(12, 15, 20, 0.78);
	-webkit-backdrop-filter: blur(6px);
	backdrop-filter: blur(6px);
	animation: lb_in 0.22s ease both;
}
#lightbox[hidden] { display: none; }

#lightbox figure {
	margin: 0;
	/* Width is also capped by the height available, so a 16:9 video always
	   fits whole. Constraining the video's own max-height instead fought
	   its aspect-ratio and pillarboxed it inside its own element.
	   64px is the caption's budget. */
	width: min(92vw, 1180px, calc((88vh - 64px) * 16 / 9));
	animation: lb_rise 0.28s cubic-bezier(0.2, 0.9, 0.25, 1) both;
}

/* two stacked videos: the cached page cut plays at once, the HD master
   fades in over it only when fully buffered */
.lb_stage {
	position: relative;
	width: 100%;
	aspect-ratio: 16 / 9;
	border-radius: 10px;
	overflow: hidden;
	background: #000;
	box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
	cursor: zoom-out;
}
#lb_video, #lb_hd {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	display: block;
	object-fit: contain;
}
#lb_hd { opacity: 0; transition: opacity 0.35s ease; }
#lb_hd.ready { opacity: 1; }
#lightbox { cursor: zoom-out; }

#lb_caption {
	margin-top: 12px;
	text-align: center;
	color: #dfe3e8;
	font-size: 0.88rem;
	line-height: 1.5;
}

#lb_close {
	position: absolute;
	top: 18px;
	right: 20px;
	width: 40px;
	height: 40px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.25);
	background: rgba(255, 255, 255, 0.08);
	color: #fff;
	font-size: 1.4rem;
	line-height: 1;
	cursor: pointer;
	transition: background 0.2s ease, transform 0.2s ease;
}
#lb_close:hover { background: rgba(255, 255, 255, 0.18); transform: rotate(90deg); }

@keyframes lb_in   { from { opacity: 0 } to { opacity: 1 } }
@keyframes lb_rise { from { opacity: 0; transform: translateY(12px) scale(0.98) }
                     to   { opacity: 1; transform: none } }

@media (max-width: 560px) {
	#lightbox { padding: 14px; }
	#lb_close { top: 10px; right: 12px; }
}

/* ------------------------------------------------------------ reveal on scroll
   Only elements the script tags get hidden, so the page is fully visible
   with JavaScript off. */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after { transition: none !important; animation: none !important; }
	.reveal { opacity: 1; transform: none; }
	.pub_list > li:hover { transform: none; }
	#to_top, #to_top:active { transform: none; }
	#to_top:hover span { transform: none; }
	#lightbox, #lightbox figure { animation: none; }
	#lb_close:hover { transform: none; }
}

/* ------------------------------------------------------------ small screens */

@media (max-width: 860px) {
	.pub_list > li { grid-template-columns: 240px 1fr; gap: 18px; }
}

@media (max-width: 720px) {
	.pub_list > li { grid-template-columns: 200px 1fr; gap: 16px; }
}

@media (max-width: 560px) {
	body { padding: 0 18px 40px; font-size: 16px; }
	.hero { grid-template-columns: 1fr; justify-items: center; text-align: center; gap: 18px; padding-top: 32px; }
	#profile_pic { width: 132px; height: 132px; }
	h1 { font-size: 2rem; }
	.links { align-items: center; }
	.pub_list > li { grid-template-columns: 1fr; }
	th { width: 84px; }
}

@media print {
	#theme_toggle, #to_top { display: none; }
	.reveal { opacity: 1; transform: none; }
	.pub_list > li { box-shadow: none; break-inside: avoid; }
}