/* Layout: a service-manual column. Each project is a build log with a spec block,
   the P-51 sits on a drafting grid in the header, and nothing else gets decoration. */

@font-face {
	font-family: "IBM Plex Sans";
	src: url("../fonts/plex-sans-var-latin.woff2") format("woff2");
	font-weight: 400 600;
	font-display: swap;
}
@font-face {
	font-family: "IBM Plex Sans Condensed";
	src: url("../fonts/plex-sans-condensed-600-latin.woff2") format("woff2");
	font-weight: 600;
	font-display: swap;
}
@font-face {
	font-family: "IBM Plex Mono";
	src: url("../fonts/plex-mono-400-latin.woff2") format("woff2");
	font-weight: 400;
	font-display: swap;
}

:root {
	--paper: #f5f7f9;
	--sheet: #ffffff;
	--ink: #131b24;
	--muted: #4f5d6c;
	--rule: #d6dde5;
	--grid: rgba(0, 95, 210, 0.08);
	--accent: #0a5cc8;
	--accent-soft: #e4eefb;
	--highlight: #fff4c2;
	--todo: #a35a00;
	--wire: 0 119 255;

	--f-display: "IBM Plex Sans Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
	--f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
	--f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

	--step--1: 0.85rem;
	--step-0: 1.0625rem;
	--step-1: 1.3rem;
	--step-2: 1.75rem;
	--step-3: clamp(2.4rem, 6vw, 3.5rem);

	--gutter: clamp(16px, 4vw, 40px);
	--max: 1080px;
	--sidebar: 17rem;
	--layout-max: calc(var(--max) + var(--sidebar) + 1rem);
	color-scheme: light;
}

@media (prefers-color-scheme: dark) {
	:root {
		--paper: #0d1217;
		--sheet: #141b23;
		--ink: #e4eaf0;
		--muted: #9aa8b6;
		--rule: #26313d;
		--grid: rgba(90, 160, 255, 0.08);
		--accent: #6eabff;
		--accent-soft: #16263a;
		--highlight: #3a3212;
		--todo: #f0a64a;
		--wire: 110 170 255;
		color-scheme: dark;
	}
}

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

html { scroll-padding-top: 4.5rem; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
	margin: 0;
	background: var(--paper);
	color: var(--ink);
	font-family: var(--f-body);
	font-size: var(--step-0);
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
}

img, video { display: block; max-width: 100%; height: auto; }

h1, h2, h3 {
	font-family: var(--f-display);
	font-weight: 600;
	line-height: 1.1;
	margin: 0;
	text-wrap: balance;
}

p { margin: 0; }
a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.num { font-variant-numeric: tabular-nums; }

.wrap {
	width: 100%;
	max-width: var(--max);
	margin-inline: auto;
	padding-inline: var(--gutter);
}

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

.skip {
	position: absolute;
	left: var(--gutter);
	top: -3rem;
	background: var(--sheet);
	padding: 0.5rem 0.75rem;
	z-index: 10;
}
.skip:focus { top: 0.5rem; }

/* Top bar */
.topbar {
	position: sticky;
	top: 0;
	z-index: 5;
	background: color-mix(in srgb, var(--paper) 92%, transparent);
	backdrop-filter: blur(6px);
	border-bottom: 1px solid var(--rule);
}
.topbar-inner {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: flex-end;
	gap: 0.25rem 1.5rem;
	padding-block: 0.6rem;
}
.topbar ul {
	display: flex;
	flex-wrap: wrap;
	gap: 0 1.25rem;
	list-style: none;
	margin: 0;
	padding: 0;
}
.topbar ul a {
	display: inline-block;
	padding-block: 0.35rem;
	font-size: var(--step--1);
	font-family: var(--f-mono);
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--muted);
	text-decoration: none;
}
.topbar ul a:hover { color: var(--accent); }

/* Header */
.hero {
	display: grid;
	grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
	gap: 2.5rem;
	align-items: center;
	padding-block: 3.5rem 3rem;
}
.hero-text { display: grid; gap: 1.25rem; }
.hero-id { display: flex; align-items: center; gap: 1.25rem; }
.headshot {
	width: 96px;
	height: 96px;
	border-radius: 50%;
	flex: none;
	background: var(--sheet);
}
h1 { font-size: var(--step-3); letter-spacing: -0.01em; }
.role {
	font-family: var(--f-mono);
	font-size: var(--step--1);
	text-transform: uppercase;
	letter-spacing: 0.08em;
	color: var(--muted);
	margin-top: 0.35rem;
}
.lede { font-size: var(--step-1); line-height: 1.5; max-width: 34ch; }
.contact {
	display: flex;
	flex-wrap: wrap;
	gap: 0.25rem 1.25rem;
	list-style: none;
	margin: 0;
	padding: 0;
}
.contact a { display: inline-block; padding-block: 0.3rem; font-weight: 600; }

/* The P-51 on its drafting grid */
.p51-figure { margin: 0; display: grid; gap: 0.5rem; }
.p51 {
	position: relative;
	aspect-ratio: 4 / 3;
	max-width: 100%;
	background-color: var(--sheet);
	background-image:
		linear-gradient(var(--grid) 1px, transparent 1px),
		linear-gradient(90deg, var(--grid) 1px, transparent 1px);
	background-size: 24px 24px;
	border: 1px solid var(--rule);
	border-radius: 4px;
	overflow: hidden;
}
.p51 img {
	position: absolute;
	inset: 8%;
	width: 84%;
	height: 84%;
	object-fit: contain;
	transition: opacity 0.4s ease;
}
.p51 canvas {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	cursor: grab;
	touch-action: none;
	opacity: 0;
	transition: opacity 0.4s ease;
}
.p51 canvas:active { cursor: grabbing; }
.p51.is-live canvas { opacity: 1; }
.p51.is-live img { opacity: 0; }
@media (prefers-color-scheme: dark) { .p51 img { filter: invert(1) hue-rotate(180deg); opacity: 0.8; } }
.p51-figure figcaption {
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 0.25rem 1rem;
	font-family: var(--f-mono);
	font-size: 0.75rem;
	color: var(--muted);
}
.hint { opacity: 0; transition: opacity 0.3s; }
.p51-figure:has(.is-live) .hint { opacity: 1; }

/* Sections */
.section {
	display: grid;
	gap: 1.75rem;
	padding-block: 3.5rem;
	border-top: 1px solid var(--rule);
}
.section-head { display: grid; gap: 0.5rem; }
.section-head h2 { font-size: var(--step-2); }
.section-head p { color: var(--muted); max-width: 60ch; }

/* Build logs */
.log {
	display: grid;
	gap: 1rem;
	background: var(--sheet);
	border: 1px solid var(--rule);
	border-radius: 4px;
	padding: clamp(1.25rem, 3vw, 2rem);
	transition: box-shadow 0.2s, opacity 0.2s;
}
.log-head {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: baseline;
	gap: 0.5rem 2rem;
}
.log-head h3 { font-size: var(--step-2); }
.log-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 0.25rem 1.5rem;
	margin: 0;
	font-size: var(--step--1);
}
.log-meta div { display: flex; gap: 0.4rem; align-items: baseline; }
.log-meta dt, .log-body dt {
	font-family: var(--f-mono);
	font-size: 0.72rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--muted);
}
.log-meta dd { margin: 0; }
.status {
	font-family: var(--f-mono);
	font-size: 0.75rem;
	color: var(--accent);
	background: var(--accent-soft);
	border-radius: 3px;
	padding: 0.1rem 0.4rem;
}
.log-stats {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem 2.5rem;
	margin: 0;
}
.log-stats div { display: grid; gap: 0.1rem; }
.log-stats dt {
	font-family: var(--f-mono);
	font-size: 0.72rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--muted);
}
.log-stats dd {
	margin: 0;
	font-family: var(--f-display);
	font-weight: 600;
	font-size: var(--step-2);
	line-height: 1.1;
	color: var(--accent);
}
.log-summary { font-size: var(--step-1); max-width: 60ch; }
.log-body { display: grid; gap: 0; margin: 0; border-top: 1px solid var(--rule); }
.log-body div {
	display: grid;
	grid-template-columns: 9.5rem minmax(0, 1fr);
	gap: 0.25rem 1.5rem;
	padding-block: 0.75rem;
	border-bottom: 1px solid var(--rule);
}
.log-body dt { padding-top: 0.25rem; }
.log-body dd { margin: 0; max-width: 65ch; }
.todo {
	color: var(--todo);
	font-style: italic;
	outline: 1px dashed currentColor;
	outline-offset: 4px;
}

.flow {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem;
	list-style: none;
	margin: 0;
	padding: 0;
}
.flow li {
	display: grid;
	gap: 0.1rem;
	padding: 0.6rem 0.8rem;
	border: 1px solid rgb(var(--wire) / 0.55);
	border-radius: 3px;
	background: var(--paper);
	font-size: var(--step--1);
}
.flow li b { font-family: var(--f-mono); font-weight: 400; color: var(--accent); }
.flow li span { color: var(--muted); font-size: 0.8rem; }
.flow li + li { position: relative; margin-left: 1.25rem; }
.flow li + li::before {
	content: "→";
	position: absolute;
	left: -1.35rem;
	top: 50%;
	transform: translateY(-50%);
	color: var(--muted);
}

.chips {
	display: flex;
	flex-wrap: wrap;
	gap: 0.4rem;
	list-style: none;
	margin: 0;
	padding: 0;
}
.chips li {
	font-family: var(--f-mono);
	font-size: 0.75rem;
	color: var(--muted);
	border: 1px solid var(--rule);
	border-radius: 3px;
	padding: 0.1rem 0.45rem;
}

/* Highlighting from the parts list */
.is-dim { opacity: 0.4; }
.is-match { box-shadow: 0 0 0 2px var(--accent); }

/* Parts list */
.parts {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
	gap: 1.5rem 2rem;
}
.parts-group { display: grid; gap: 0.5rem; align-content: start; }
.parts-group h3 {
	font-family: var(--f-mono);
	font-weight: 400;
	font-size: 0.75rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--muted);
	padding-bottom: 0.4rem;
	border-bottom: 1px solid var(--ink);
}
.parts-group ul { list-style: none; margin: 0; padding: 0; }
.parts-group button {
	display: grid;
	grid-template-columns: 3.5rem 1fr auto;
	align-items: baseline;
	gap: 0.5rem;
	width: 100%;
	min-height: 2.25rem;
	padding: 0.35rem 0.4rem;
	border: 0;
	border-bottom: 1px dotted var(--rule);
	background: none;
	color: var(--ink);
	font: inherit;
	text-align: left;
	cursor: pointer;
}
.parts-group button:hover { background: var(--accent-soft); }
.parts-group button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.pn, .qty {
	font-family: var(--f-mono);
	font-size: 0.75rem;
	font-weight: 400;
	color: var(--muted);
	font-variant-numeric: tabular-nums;
}
.parts-status {
	/* Fixed height so the list below never moves when the message changes. */
	height: calc(4lh + 1.5rem);
	overflow-y: auto;
	padding: 0.75rem 1rem;
	background: var(--sheet);
	border: 1px solid var(--rule);
	border-radius: 4px;
}
.parts-also { color: var(--muted); font-size: var(--step--1); }

/* Narrow screens: the parts list is a normal section after the page content. */
.parts-panel {
	width: 100%;
	max-width: var(--max);
	margin-inline: auto;
	padding-inline: var(--gutter);
}

/* Wide screens: it becomes a sticky sidebar beside everything from the header down. */
@media (min-width: 1100px) {
	.layout {
		display: grid;
		grid-template-columns: minmax(0, 1fr) var(--sidebar);
		column-gap: 1rem;
		max-width: var(--layout-max);
		margin-inline: auto;
		padding-right: var(--gutter);
	}
	.layout > .hero, .layout > main { grid-column: 1; }
	.layout > .parts-panel {
		grid-column: 2;
		grid-row: 1 / span 2;
		align-self: start;
		position: sticky;
		top: 3.25rem;
		max-height: calc(100vh - 3.25rem);
		overflow-y: auto;
		overscroll-behavior: contain;
		scrollbar-width: thin;
		scrollbar-color: var(--rule) transparent;
		max-width: none;
		padding: 1.5rem 0.25rem 1.5rem 1.25rem;
		gap: 1rem;
		border-top: 0;
		border-left: 1px solid var(--rule);
	}
	.parts-panel .section-head h2 { font-size: var(--step-1); }
	.parts-panel .section-head p { font-size: var(--step--1); }
	.parts-panel .parts { grid-template-columns: 1fr; gap: 1.25rem; }
	.parts-panel .parts-group button {
		grid-template-columns: 2.75rem 1fr auto;
		min-height: 1.85rem;
		padding: 0.15rem 0.35rem;
		font-size: 0.95rem;
	}
	.parts-panel .parts-status {
		position: sticky;
		top: 0;
		z-index: 1;
		height: calc(4lh + 1.2rem);
		padding: 0.6rem 0.75rem;
		font-size: var(--step--1);
		box-shadow: 0 0.5rem 0.5rem -0.5rem var(--paper);
	}
	.topbar-inner { max-width: var(--layout-max); }
	/* The sidebar is always visible here, so its nav link is redundant. */
	.topbar li:has(a[href="#parts"]) { display: none; }
}

/* Fundamentals */
.cards {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
	gap: 1.5rem;
}
.card {
	display: grid;
	grid-template-rows: auto auto 1fr auto auto;
	gap: 0.75rem;
	background: var(--sheet);
	border: 1px solid var(--rule);
	border-radius: 4px;
	padding: 1rem;
	transition: box-shadow 0.2s, opacity 0.2s;
}
.card-media {
	display: block;
	aspect-ratio: 16 / 10;
	overflow: hidden;
	border-radius: 3px;
	background: var(--paper);
}
.card-media img, .card-media video { width: 100%; height: 100%; object-fit: cover; }
.card h3 { font-size: var(--step-1); }
.card p { color: var(--muted); }
.card-links {
	display: flex;
	gap: 1rem;
	list-style: none;
	margin: 0;
	padding: 0;
}
.card-links a { display: inline-block; padding-block: 0.25rem; font-weight: 600; }

/* Garage reveal */
.reveal {
	position: relative;
	aspect-ratio: 3 / 2;
	max-width: 100%;
	overflow: hidden;
	border-radius: 4px;
	border: 1px solid var(--rule);
	background: var(--sheet);
}
.reveal img {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	object-fit: cover;
}
.reveal-after { clip-path: inset(0 calc(100% - var(--pos)) 0 0); }
.reveal::after {
	content: "";
	position: absolute;
	top: 0;
	bottom: 0;
	left: var(--pos);
	width: 2px;
	margin-left: -1px;
	background: #fff;
	box-shadow: 0 0 0 1px rgb(0 0 0 / 0.25);
	pointer-events: none;
}
.reveal input {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	margin: 0;
	opacity: 0;
	cursor: ew-resize;
}
.reveal:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 3px; }
.reveal-empty { display: none; }
.reveal.is-empty {
	display: grid;
	place-items: center;
	background-image:
		linear-gradient(var(--grid) 1px, transparent 1px),
		linear-gradient(90deg, var(--grid) 1px, transparent 1px);
	background-size: 24px 24px;
}
.reveal.is-empty img, .reveal.is-empty input, .reveal.is-empty::after { display: none; }
.reveal.is-empty .reveal-empty {
	display: block;
	padding: 1rem;
	text-align: center;
	color: var(--todo);
	font-style: italic;
}

/* About */
.about { margin: 0; padding-left: 1.2rem; display: grid; gap: 0.5rem; max-width: 60ch; }

/* Footer */
.footer { border-top: 1px solid var(--rule); background: var(--sheet); }
.footer-inner {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: center;
	gap: 1rem 2rem;
	padding-block: 2rem;
	font-size: var(--step--1);
	color: var(--muted);
}

@media (max-width: 760px) {
	.hero { grid-template-columns: 1fr; padding-block: 2rem; }
	.topbar ul { gap: 0 0.9rem; }
	.log-body div { grid-template-columns: 1fr; }
	.flow li + li { margin-left: 0; }
	.flow li + li::before { content: none; }
}

@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after { transition: none !important; }
}