/*
	PHAI Lab — project-page customizations  (layered ON TOP of Strata main.css)
	Keep your tweaks here so the upstream theme stays pristine.

	========================================================================
	RE-THEME IN ONE PLACE: change --accent (and the matching --accent-rgb).
	(e.g. #254669 PHAI navy, #8C1515 cardinal, #500000 maroon, #1a73e8 blue)
	========================================================================
*/

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap");

:root {
	--accent:        #254669;   /* PHAI navy (sampled from the lab logo) */
	--accent-rgb:    37, 70, 105; /* keep in sync with --accent (primary-button glow) */
	--accent-strong: #1a3550;   /* darker navy for hovers */
	--accent-soft:   #e9eef4;   /* very light navy tint     */
	--ink:        #1d1d1f;      /* neutral near-black headings */
	--ink-soft:   #3a3a3c;      /* body text            */
	--ink-muted:  #6b6b70;      /* captions / meta — WCAG AA on white & panels */
	--line:       #e8e8ed;      /* hairline dividers    */
	--bg-soft:    #f7f7f8;      /* panels / code blocks */
	--radius:     16px;
	--shadow:     0 10px 30px rgba(22,32,44,.10), 0 2px 6px rgba(22,32,44,.06);
	--shadow-sm:  0 2px 8px rgba(22,32,44,.10);
}

/* ---------- Base typography ---------- */
html, body { background: #fff; }
body, input, select, textarea {
	font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
	color: var(--ink-soft);
	font-size: 16.5px;
	line-height: 1.7;
	letter-spacing: -0.004em;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}
#main h1, #main h2, #main h3, #main h4 {
	font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
	color: var(--ink);
}
#main p { color: var(--ink-soft); }
#main a { color: var(--accent); border-bottom: none; transition: color .15s ease; }
#main a:hover { color: var(--accent-strong); }

/* ---------- Layout container (also serves as the <main id="main"> landmark) ---------- */
#main {
	width: min(58em, 92%);
	max-width: 1040px;
	margin: 0 auto;
	padding-top: 3.75em;
	padding-bottom: 1.5em;
}

/* Masthead landmark: cancel Strata's `header h2 + p` size/offset so the venue
   line keeps its intended look (its color/margins already win via .venue). */
#main .masthead .venue { font-size: inherit; margin-top: 0; line-height: 1.5; }

/* ---------- Hero: title / subtitle / venue ---------- */
#main .title {
	text-align: center;
	color: var(--accent);
	font-size: clamp(2.25rem, 5vw, 3.5rem);
	font-weight: 800;
	letter-spacing: -0.03em;
	line-height: 1.08;
	margin: 0.1em 0 0.18em;
}
#main .subtitle {
	text-align: center;
	color: var(--ink);
	font-size: clamp(1.1rem, 2.6vw, 1.55rem);
	font-weight: 400;
	letter-spacing: -0.01em;
	margin-bottom: 0.7em;
}
#main .venue {
	text-align: center;
	color: var(--accent);
	font-weight: 600;
	letter-spacing: 0.01em;
	margin-bottom: 1.2em;
}

/* ---------- Affiliation logos ---------- */
.logo-row {
	display: flex; flex-wrap: wrap;
	justify-content: center; align-items: center;
	gap: 2.75em;
	margin: 0.25em 0 1.6em;
}
#main .logo-row img {
	height: 52px; width: auto;
	max-width: 300px;          /* guard so a wide collaborator logo can't unbalance the row */
	object-fit: contain;
}
/* Wide wordmark logos read best a touch shorter than icon/crest logos */
#main .logo-row img.wordmark { height: 38px; }

/* ---------- Authors + affiliations ---------- */
.authors {
	text-align: center;
	font-size: 1.16rem;
	font-weight: 500;
	line-height: 1.85em;
	color: var(--ink);
	margin-bottom: 0.25em;
}
#main .authors a, #main .affiliations a { color: var(--ink); }
#main .authors a:hover, #main .affiliations a:hover { color: var(--accent); }
.authors sup { color: var(--accent); font-weight: 600; }
.affiliations {
	text-align: center;
	color: var(--ink-muted);
	font-size: 1rem;
	line-height: 1.7em;
	margin-bottom: 1.4em;
}
.affiliations sup { color: var(--accent); }

/* ---------- Link buttons (pill style) ---------- */
.links { text-align: center; margin-bottom: 1.9em; }
.links .button {
	font-family: inherit;
	display: inline-flex; align-items: center; justify-content: center;
	gap: 0.5em;
	min-width: 0;                  /* override Strata's min-width so pills hug content */
	height: auto; line-height: 1;
	margin: 0.32em 0.3em;
	padding: 0.72em 1.25em;
	border-radius: 999px;
	background: var(--ink);
	color: #fff !important;        /* must beat Strata's .button{color:#787878 !important} */
	font-size: 0.92rem;
	font-weight: 600;
	letter-spacing: 0.005em;
	text-transform: none;
	border: 0;
	box-shadow: var(--shadow-sm);
	transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.links .button:hover {
	background: #283341;
	transform: translateY(-2px);
	box-shadow: 0 10px 22px rgba(22,32,44,.22);
}
.links .button:active { transform: translateY(0); }
/* block Strata's teal :hover/:active text color */
.links .button:hover, .links .button:active,
.links .button.special:hover, .links .button.special:active { color: #fff !important; }
.links .button.special { background: var(--accent); box-shadow: 0 4px 14px rgba(var(--accent-rgb), .30); }
.links .button.special:hover { background: var(--accent-strong); }
.links .button.icon { padding-left: 1.25em; }
.links .button.icon:before { margin-right: 0; line-height: 1; font-size: 1.08em; }

/* ---------- Section headings (centered, accent underline; carry the section gap) ---------- */
#main h3 {
	text-align: center;
	font-size: 1.9rem;
	font-weight: 800;
	letter-spacing: -0.015em;
	color: var(--ink);
	margin: 3.25em 0 0.9em;
}
#main h3:after {
	content: "";
	display: block;
	width: 56px; height: 2px;
	margin: 0.55em auto 0;
	background: var(--accent);
	border-radius: 2px;
	opacity: 0.92;
}

/* Optional manual divider (sections no longer emit <hr>, but it stays available) */
#main hr { border: 0; height: 1px; background: var(--line); margin: 3.25em 0; }

/* ---------- Media: rounded + soft shadow ---------- */
#main img, #main video, #main iframe { max-width: 100%; }
#main img, #main video { height: auto; }
.teaser { display: block; margin: 0.6em 0 1.4em; }
.teaser img, .teaser video,
span.image img,
.image.fit img {
	border-radius: var(--radius);
	box-shadow: var(--shadow);
}
/* Let pointer events through Strata's transparent .image overlay so the
   hover-lift fires; match the corner radius if the overlay is ever enabled. */
#main span.image:before, #main .image.fit:before { pointer-events: none; border-radius: var(--radius); }
.team .image:before { pointer-events: none; }
.media-caption {
	text-align: center;
	color: var(--ink-muted);
	font-size: 0.95rem;
	margin-top: 0.55em;
	margin-bottom: 0.4em;
}

/* Responsive 16:9 video wrapper (YouTube/Vimeo) */
.video-embed {
	position: relative;
	width: 100%;
	padding-bottom: 56.25%;
	height: 0;
	margin-bottom: 0.6em;
	border-radius: var(--radius);
	overflow: hidden;
	background: linear-gradient(135deg, #eef2f7, #e3e9f1);
	box-shadow: var(--shadow);
}
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ---------- Result / media grid ---------- */
.box.alt { border: 0; padding: 0; }
.box.alt .image.fit img { box-shadow: var(--shadow-sm); }

/* Subtle hover lift on grid + team tiles */
.box.alt .image.fit img,
.team .image img {
	transition: transform .18s ease, box-shadow .18s ease;
}
.box.alt .image.fit img:hover,
.team .image img:hover {
	transform: translateY(-3px);
	box-shadow: var(--shadow);
}

/* ---------- Side-by-side comparison (Ours vs Baseline) ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1em; margin: 1em 0; }
.compare .col { position: relative; }
.compare .col-label {
	position: absolute; top: .6em; left: .6em; z-index: 2;
	background: var(--ink); color: #fff; font-size: .78rem; font-weight: 700;
	padding: .22em .6em; border-radius: 999px; letter-spacing: .01em;
}
.compare .col.ours .col-label { background: var(--accent); }
.compare .speed-badge {
	position: absolute; bottom: .6em; right: .6em; z-index: 2;
	background: rgba(0,0,0,.62); color: #fff; font-size: .72rem; font-weight: 700;
	padding: .18em .5em; border-radius: 6px;
}
.compare video, .compare img {
	width: 100%; height: auto; display: block;
	border-radius: var(--radius); box-shadow: var(--shadow-sm);
}

/* ---------- Results table (benchmark) ---------- */
.table-wrap {
	margin: 1.4em 0;
	border-radius: var(--radius);
	box-shadow: var(--shadow-sm);
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
}
.results-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; margin: 0; }
.results-table th, .results-table td {
	padding: 0.7em 1em; text-align: center; white-space: nowrap;
	border-bottom: 1px solid var(--line);
}
.results-table thead th { background: var(--accent); color: #fff; font-weight: 700; }
.results-table tbody tr:nth-child(even) { background: var(--bg-soft); }
.results-table tbody tr:last-child td { border-bottom: 0; }
.results-table td:first-child, .results-table th:first-child { text-align: left; font-weight: 600; color: var(--ink); }
.results-table .best { font-weight: 800; color: var(--accent); }

/* ---------- Team (circular photos) ---------- */
.team .image img {
	border-radius: 50%;
	box-shadow: var(--shadow-sm);
	aspect-ratio: 1 / 1;
	object-fit: cover;
}
.team a { color: var(--ink); font-weight: 600; }
.team a:hover { color: var(--accent); }

/* ---------- BibTeX ---------- */
#main pre {
	background: var(--bg-soft);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	padding: 1.25em 1.4em;
	box-shadow: none;
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
}
#main pre code {
	display: block;
	padding: 0;
	overflow-x: visible;
	font-family: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
	font-size: 0.86rem;
	line-height: 1.6;
	color: var(--ink-soft);
}
#main p code, #main li code {
	background: var(--accent-soft);
	color: var(--accent-strong);
	border-radius: 6px;
	padding: 0.1em 0.4em;
	font-size: 0.88em;
}

/* ---------- Footer ---------- */
#page-footer {
	text-align: center;
	color: var(--ink-muted);
	font-size: 0.9rem;
	border-top: 1px solid var(--line);
	margin-top: 3em;
	padding-top: 1.5em;
}
#page-footer a { color: var(--accent); }

/* ---------- Keyboard focus (WCAG 2.4.7) ---------- */
#main a:focus-visible,
.team a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.links .button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 999px; }
/* Fallback for browsers without :focus-visible */
#main a:focus, .links .button:focus { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Small screens ---------- */
@media (max-width: 736px) {
	.logo-row { gap: 1.5em; }
	#main .logo-row img { height: 42px; }

	/* Buttons: clean full-width vertical stack with even gutters */
	.links { display: flex; flex-direction: column; align-items: stretch; }
	.links .button { width: 100%; margin: 0.45em 0; justify-content: center; }

	/* Tighten section headers for the narrow measure */
	#main h3 { font-size: 1.45rem; margin: 2.4em 0 0.7em; }
	#main h3:after { width: 40px; }

	/* Strata's plain .4u/.3u columns never reflow — force readable layouts.
	   Results (3 tiles) stack 1-up; Team (4 tiles) goes 2-up. */
	.box.alt .row { margin-left: 0; }
	.box.alt .row > * { padding-left: 0; width: 100%; }
	.team .box.alt .row { margin-left: -1.25em; }
	.team .box.alt .row > * { padding-left: 1.25em; width: 50%; }
	.team .box.alt .row > *:nth-child(n+3) { margin-top: 1.5em; }

	/* Comparison stacks on phones */
	.compare { grid-template-columns: 1fr; }

	/* BibTeX tighter on phones */
	#main pre { padding: 0.9em 1em; }
	#main pre code { font-size: 0.8rem; }
}

/* ---------- Respect OS "reduce motion" preference (WCAG 2.3.3) ---------- */
@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
		scroll-behavior: auto !important;
	}
	.links .button:hover,
	.box.alt .image.fit img:hover,
	.team .image img:hover { transform: none; }
}