/* fonts */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=Caveat:wght@600&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Rock+Salt&display=swap');

/* ---------- design tokens ---------- */
:root {
	/* colors */
	--bg: #fffdf9; /* cream */
	--ink: #1e1b19; /* main text */
	--muted: #67615b;
	--card: #ffffff;
	--line: color-mix(in oklab, var(--ink) 12%, transparent);

	/* pastels */
	--p1: #ffdfe7; /* pink */
	--p2: #fff3c9; /* butter */
	--p3: #daf6e5; /* mint */
	--p4: #e7e7ff; /* lavender */
	--p5: #f4efe6; /* oat */

	/* icon ink (overridable in dark) */
	--icon-ink: var(--ink);

	/* shape + motion */
	--r-lg: 18px;
	--r-sm: 12px;
	--elev-1: 0 6px 20px rgba(0, 0, 0, 0.06), inset 0 0 0 1px var(--line);
	--elev-2: 0 12px 28px rgba(0, 0, 0, 0.1), inset 0 0 0 1px var(--line);
	--speed: 160ms;

	/* layout */
	--container: min(1100px, 92vw);
	--grid-min: 300px;

	/* type scale */
	--fs-0: 14px;
	--fs-1: clamp(15.5px, 1.4vw, 17px);
	--fs-2: clamp(18px, 2.1vw, 20px);
	--fs-3: clamp(22px, 2.8vw, 26px);
	--fs-4: clamp(28px, 3.8vw, 34px);
	--lh: 1.55;

	/* background helpers */
	--bg-grid: color-mix(in oklab, var(--ink) 12%, transparent);
	--bg-grid-size: 22px;
	--bg-dot: 1.1px;

	/* hand accent */
	--font-hand: 'Caveat', system-ui;
}

:root.dark {
	--bg: #121112;
	--ink: #f6f3ee;
	--muted: #b9b2aa;
	--card: #1b191b;
	--line: color-mix(in oklab, var(--ink) 14%, transparent);
	--elev-1: 0 6px 20px rgba(0, 0, 0, 0.4), inset 0 0 0 1px var(--line);
	--elev-2: 0 14px 30px rgba(0, 0, 0, 0.5), inset 0 0 0 1px var(--line);

	/* icons go black in dark */
	--icon-ink: #000;

	--bg-grid: color-mix(in oklab, var(--ink) 20%, transparent);
}

/* better callouts in dark */
:root.dark .callout,
:root.dark .callout.ok,
:root.dark .callout.info,
:root.dark .callout.warn {
	color: #111;
}
:root.dark .callout a {
	color: #111;
	text-decoration-color: #111;
}
:root.dark .callout {
	background: color-mix(in oklab, var(--p2) 88%, #fff 12%);
}
:root.dark .callout.ok {
	background: color-mix(in oklab, var(--p3) 88%, #fff 12%);
}
:root.dark .callout.info {
	background: color-mix(in oklab, var(--p4) 88%, #fff 12%);
}
:root.dark .callout.warn {
	background: color-mix(in oklab, var(--p1) 88%, #fff 12%);
}

/* ---------- base ---------- */
* {
	box-sizing: border-box;
}
html,
body {
	height: 100%;
}

body {
	margin: 0;
	font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas,
		'Liberation Mono', monospace;

	/* default = dotted */
	background: radial-gradient(
				var(--bg-grid) var(--bg-dot),
				transparent calc(var(--bg-dot) + 0.1px)
			)
			0 0 / var(--bg-grid-size) var(--bg-grid-size),
		radial-gradient(
				var(--bg-grid) var(--bg-dot),
				transparent calc(var(--bg-dot) + 0.1px)
			)
			calc(var(--bg-grid-size) / 2) calc(var(--bg-grid-size) / 2) /
			var(--bg-grid-size) var(--bg-grid-size),
		var(--bg);

	color: var(--ink);
	line-height: var(--lh);
	font-size: var(--fs-1);
	text-rendering: optimizeLegibility;
	-webkit-font-smoothing: antialiased;
}

/* background helpers */
body.bg-dots {
	background: radial-gradient(
				var(--bg-grid) var(--bg-dot),
				transparent calc(var(--bg-dot) + 0.1px)
			)
			0 0 / var(--bg-grid-size) var(--bg-grid-size),
		radial-gradient(
				var(--bg-grid) var(--bg-dot),
				transparent calc(var(--bg-dot) + 0.1px)
			)
			calc(var(--bg-grid-size) / 2) calc(var(--bg-grid-size) / 2) /
			var(--bg-grid-size) var(--bg-grid-size),
		var(--bg) !important;
}
body.bg-grid {
	background: repeating-linear-gradient(
			to bottom,
			color-mix(in oklab, var(--ink) 8%, transparent) 0 1px,
			transparent 1px var(--bg-grid-size)
		),
		repeating-linear-gradient(
			to right,
			color-mix(in oklab, var(--ink) 8%, transparent) 0 1px,
			transparent 1px var(--bg-grid-size)
		),
		var(--bg) !important;
}
body.bg-lined {
	background: repeating-linear-gradient(
			to bottom,
			color-mix(in oklab, var(--ink) 10%, transparent) 0 1px,
			transparent 1px calc(var(--bg-grid-size) * 1.5)
		),
		var(--bg) !important;
}
body.bg-solid {
	background: var(--bg) !important;
}

.container {
	width: var(--container);
	margin: clamp(14px, 2vw, 24px) auto;
}

/* ---------- header / nav ---------- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 10;
	backdrop-filter: saturate(1.1) blur(8px);
	background: color-mix(in oklab, var(--bg) 88%, transparent);
	border-bottom: 1px solid var(--line);
	display: grid;
	grid-template-columns: auto 1fr; /* logo left, nav right */
	align-items: center;
	column-gap: 12px;
	padding: 14px clamp(10px, 2vw, 20px);
}

.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	text-decoration: none;
	color: inherit;
}

.brand-logo {
	display: block;
	height: 100px;
	width: auto;
}

@media (max-width: 640px) {
	.brand-logo {
		height: 40px;
	}
}

.brand-text {
	position: absolute;
	left: -9999px; /* visually hide fallback text */
}

.site-nav {
	justify-self: end;
	display: flex;
	align-items: center;
	gap: 10px;
	flex-wrap: wrap;
}

.site-nav a {
	color: var(--muted);
	text-decoration: none;
	padding: 8px 10px;
	border-radius: 12px;
	transition: background var(--speed), color var(--speed);
}
.site-nav a:hover {
	background: var(--p5);
	color: var(--ink);
}
:root.dark .site-nav a:hover {
	background: color-mix(in oklab, var(--card) 70%, transparent);
}

:root.dark .site-nav a:hover {
	background: color-mix(in oklab, var(--card) 70%, transparent);
}

/* tiny helper note */
.header-note {
	font-size: var(--fs-0);
	color: var(--muted);
	padding: 4px 8px;
	border-radius: 999px;
	background: color-mix(in oklab, var(--card) 90%, var(--p5) 10%);
	box-shadow: inset 0 0 0 1px var(--line);
}

/* Smaller screens can scale down a touch */
@media (max-width: 480px) {
	.brand-logo {
		height: 38px;
	}
}

/* toggle buttons (theme + background) */
.toggle-group {
	display: inline-flex;
	gap: 8px;
	align-items: center;
}

.toggle-btn {
	font-size: 20px; /* compact so both fit nicely */
	line-height: 1;
	padding: 10px 12px;
	border: none;
	background: var(--card);
	border-radius: 999px;
	cursor: pointer;
	color: var(--ink);
	box-shadow: inset 0 0 0 1px var(--line);
	transition: background var(--speed), transform var(--speed),
		opacity var(--speed);
}

.toggle-btn:hover {
	background: var(--p5);
	transform: translateY(-1px);
}

:root.dark .toggle-btn {
	background: var(--card);
	color: var(--ink);
}

/* optional: small-screen tweaks so the header doesn’t wrap awkwardly */
@media (max-width: 640px) {
	.site-nav {
		gap: 6px;
	}
	.toggle-btn {
		padding: 8px 10px;
		font-size: 18px;
	}
}

/* ---------- cards ---------- */
.grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(var(--grid-min), 1fr));
	gap: 18px;
	margin: 20px 0 8px;
}
.card {
	background: linear-gradient(
		180deg,
		color-mix(in oklab, var(--card) 90%, var(--p5) 10%),
		var(--card)
	);
	border-radius: var(--r-lg);
	box-shadow: var(--elev-1);
	padding: 16px;
	text-decoration: none;
	color: inherit;
	display: grid;
	grid-template-columns: 64px 1fr;
	gap: 14px;
	align-items: center;
	transition: transform var(--speed), box-shadow var(--speed),
		background var(--speed);
	will-change: transform;
}
.card:hover {
	transform: translateY(-3px);
	box-shadow: var(--elev-2);
}
.card .icon {
	width: 64px;
	height: 64px;
	border-radius: 16px;
	display: grid;
	place-items: center;
	font-size: 28px;
	background: var(--p3);
	color: var(--icon-ink);
}
.card[data-accent='p1'] .icon {
	background: var(--p1);
}
.card[data-accent='p2'] .icon {
	background: var(--p2);
}
.card[data-accent='p3'] .icon {
	background: var(--p3);
}
.card[data-accent='p4'] .icon {
	background: var(--p4);
}
.card[data-accent='p5'] .icon {
	background: var(--p5);
}
.card .icon i {
	color: inherit;
}
.card h3 {
	margin: 0 0 4px;
	font-size: var(--fs-2);
}
.card p {
	margin: 0;
	color: var(--muted);
	font-size: var(--fs-1);
}

.section-head {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	gap: 12px;
	margin-top: 10px;
}
.section-head h2 {
	margin: 0;
	/* font-size: var(--fs-4); */
	font-size: 20px;
	letter-spacing: 0.2px;
}
.section-head .hint {
	color: var(--muted);
	font-variant-numeric: tabular-nums;
}

/* ---------- article / prose ---------- */
article {
	width: var(--container);
	margin-inline: auto;
}
article h1 {
	font-size: var(--fs-4);
	margin: 18px 0 6px;
}
article h2 {
	font-size: var(--fs-3);
	margin: 22px 0 8px;
}
article h3 {
	font-size: var(--fs-2);
	margin: 16px 0 6px;
}
article p,
article li {
	max-width: 70ch;
}
article a {
	color: color-mix(in oklab, var(--ink) 80%, var(--p4) 20%);
	text-underline-offset: 2px;
}
article a:hover {
	text-decoration-thickness: 2px;
}

ul {
	padding-left: 1.25rem;
}
ul li {
	margin: 0.25rem 0;
}
ul li::marker {
	color: color-mix(in oklab, var(--ink) 60%, var(--p1) 40%);
}

/* code bits */
.mono,
code,
kbd {
	font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas,
		'Liberation Mono', monospace;
}
code {
	background: color-mix(in oklab, var(--card) 92%, var(--p5) 8%);
	padding: 0.15em 0.4em;
	border-radius: 8px;
	font-size: 0.95em;
}
kbd {
	background: color-mix(in oklab, var(--card) 90%, var(--p4) 10%);
	border: 1px solid var(--line);
	padding: 0.15em 0.45em;
	border-radius: 8px;
	box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.06);
}

/* callouts */
.callout {
	margin: 16px 0;
	padding: 14px 16px;
	border-radius: var(--r-lg);
	background: var(--p2);
	box-shadow: inset 0 0 0 1px var(--line);
}
.callout.info {
	background: var(--p4);
}
.callout.ok {
	background: var(--p3);
}
.callout.warn {
	background: color-mix(in oklab, var(--p1) 70%, white 30%);
}

/* tables */
table.cute {
	width: 100%;
	border-collapse: separate;
	border-spacing: 0;
	margin: 12px 0 18px;
	font-size: var(--fs-1);
}
table.cute thead th {
	text-align: left;
	color: var(--muted);
	font-weight: 700;
	padding: 10px 12px;
}
table.cute td {
	padding: 10px 12px;
	border-top: 1px solid var(--line);
}
table.cute tr:first-child td {
	border-top: none;
}
table.cute tr:nth-child(even) td {
	background: color-mix(in oklab, var(--card) 92%, var(--p5) 8%);
}
table.cute td strong {
	color: var(--ink);
}

/* diagrams */
.diagram {
	margin: 16px 0;
	padding: 12px;
	border-radius: var(--r-lg);
	background: var(--card);
	box-shadow: inset 0 0 0 1px var(--line);
}
.diagram .mono {
	font-size: 12px;
	fill: currentColor;
	opacity: 0.7;
}

/* Strong, readable SVG labels (works in dark too) */
.diagram svg {
	color: var(--ink);
}
.diagram svg text {
	fill: currentColor;
	font-weight: 700;
	letter-spacing: 0.3px;
	paint-order: stroke fill;
	stroke: var(--card);
	stroke-width: 3.5px;
	stroke-linejoin: round;
	text-rendering: geometricPrecision;
}
.diagram svg text.mini {
	font-size: 12px;
	stroke-width: 2.5px;
	opacity: 0.95;
}
.diagram.halo-strong svg text {
	stroke-width: 5px;
}
.diagram.no-halo svg text {
	stroke-width: 0;
	paint-order: normal;
}
@supports not (paint-order: stroke) {
	.diagram svg text {
		filter: drop-shadow(0 1px 0 var(--card)) drop-shadow(0 -1px 0 var(--card))
			drop-shadow(1px 0 0 var(--card)) drop-shadow(-1px 0 0 var(--card));
	}
}

/* (optional) sketchy diagram helpers */
.diagram.sketch svg [stroke] {
	stroke-linecap: round;
	stroke-linejoin: round;
}
.diagram.sketch .wire {
	stroke: var(--ink);
	stroke-width: 3;
	fill: none;
}
.diagram.sketch .part {
	stroke: var(--ink);
	stroke-width: 2.4;
	fill: none;
}
.diagram.sketch .label {
	fill: var(--ink);
	font-weight: 600;
}

/* LAB NOTE blocks (handwritten vibe) */
.note {
	border: 1.5px solid var(--line);
	border-radius: 12px;
	padding: 10px 12px;
	background: var(--card);
	margin: 12px 0;
}
.note .note-label {
	display: inline-block;
	padding: 2px 8px;
	margin-bottom: 6px;
	border: 1.5px solid var(--line);
	border-radius: 999px;
	background: var(--p1); /* default chip */
	color: var(--ink);
	font-weight: 700;
	font-family: var(--font-hand);
	letter-spacing: 0.2px;
}
.note.try .note-label {
	background: #dcefe3;
	color: #234636;
}
.note.care .note-label {
	background: #f3d4d8;
	color: #5c1e29;
}
.note.fact .note-label {
	background: #e2e6f9;
	color: #2b365c;
}

/* footer */
.site-footer {
	border-top: 1px solid var(--line);
	padding: 28px 0;
	margin-top: 40px;
	text-align: center;
	color: var(--muted);
}
.site-footer a {
	color: inherit;
	text-decoration: none;
}

/* small screens */
@media (max-width: 640px) {
	:root {
		--grid-min: 260px;
	}
	.card {
		grid-template-columns: 56px 1fr;
	}
	.card .icon {
		width: 56px;
		height: 56px;
		border-radius: 14px;
		font-size: 24px;
	}
}

/* print */
@media print {
	body {
		background: #fff;
		color: #000;
	}
	.site-header,
	.site-footer,
	.section-head .hint {
		display: none;
	}
	article a {
		color: #000;
		text-decoration: underline;
	}
}

/* resistor bands */
.band {
	display: inline-block;
	padding: 4px 10px;
	border-radius: 6px;
	font-weight: 600;
	color: #fff;
	text-transform: lowercase;
	font-size: 0.9em;
}
.band.black {
	background: #000;
}
.band.brown {
	background: #6d3f00;
}
.band.red {
	background: #c00;
}
.band.orange {
	background: #ff7f00;
	color: #000;
}
.band.yellow {
	background: #ffcf00;
	color: #000;
}
.band.green {
	background: #008c00;
}
.band.blue {
	background: #004fc0;
}
.band.violet {
	background: #7a00aa;
}
.band.gray {
	background: #777;
}
.band.white {
	background: #eee;
	color: #000;
}
.band.gold {
	background: gold;
	color: #000;
}
.band.silver {
	background: silver;
	color: #000;
}

/* ---------------- Notes (try / care / fact) ---------------- */
/* Variant tokens (you can tweak these to taste) */
.note.try {
	--note-bg: var(--p3); /* mint  */
	--note-chip: color-mix(in oklab, var(--p3) 86%, #fff 14%);
	--note-accent: color-mix(in oklab, var(--p3) 16%, var(--ink) 84%);
}
.note.care {
	--note-bg: color-mix(in oklab, var(--p1) 88%, #fff 12%); /* pink */
	--note-chip: color-mix(in oklab, var(--p1) 86%, #fff 14%);
	--note-accent: color-mix(in oklab, var(--p1) 18%, var(--ink) 82%);
}
.note.fact {
	--note-bg: var(--p4); /* lavender */
	--note-chip: color-mix(in oklab, var(--p4) 86%, #fff 14%);
	--note-accent: color-mix(in oklab, var(--p4) 16%, var(--ink) 84%);
}

/* Base block */
.note {
	position: relative;
	margin: 16px 0;
	padding: 18px 16px 16px;
	border-radius: var(--r-lg);
	background: var(--note-bg, var(--card));
	box-shadow: inset 0 0 0 1px var(--line);
	color: var(--ink);
	/* subtle “index card” accent */
	border-left: 6px solid var(--note-accent, var(--line));
}

/* Big, readable chip label */
.note .note-label {
	position: absolute;
	top: -18px;
	left: 14px;
	padding: 4px 12px;
	border-radius: 999px;
	border: 1px solid var(--line);
	background: var(--note-chip, var(--card));
	color: var(--ink);
	font-weight: 800;
	font-size: clamp(18px, 1.6vw, 22px);
	letter-spacing: 0.2px;
	/* optional handwritten vibe */
	font-family: var(--font-hand, 'IBM Plex Mono'), ui-monospace, monospace;
	line-height: 1;
	transform: rotate(-0.5deg); /* tiny zest, like a sticker */
}

/* Links remain readable inside notes */
.note a {
	color: inherit;
	text-decoration-color: currentColor;
}

/* Dark mode: keep text near-black for contrast over pastels */
:root.dark .note,
:root.dark .note .note-label,
:root.dark .note a {
	color: #111;
}

/* Small screens: give the chip a little more breathing room */
@media (max-width: 640px) {
	.note {
		padding-top: 22px;
	}
	.note .note-label {
		top: -16px;
		font-size: clamp(18px, 4.8vw, 20px);
	}
}

/* bench notes */
.note.bench {
	--note-bg: color-mix(in oklab, var(--p2) 84%, #fff 16%);
	--note-chip: color-mix(in oklab, var(--p2) 86%, #fff 14%);
	--note-accent: color-mix(in oklab, var(--p2) 22%, var(--ink) 78%);
}

/* attribution footer inside bench notes */
.note .note-cite {
	font-family: 'Rock Salt', cursive;
	font-size: 1.5rem;
	text-align: right;
	color: color-mix(in oklab, var(--ink) 50%, var(--muted) 50%);
	opacity: 0.9;
	letter-spacing: 0.5px;
}

.note .note-cite a {
	text-decoration: none;
}

.note .note-cite a:hover {
	color: rgb(167, 163, 163);
	text-decoration: none;
}

/* checklist styling for notes whose first child is a <ul> */
.note:has(> ul) ul {
	list-style: none;
	margin: 8px 0 0;
	padding-left: 0;
}

.note:has(> ul) li {
	position: relative;
	margin: 6px 0;
	padding-left: 1.4em;
	line-height: 1.5;
	cursor: pointer; /* make it clear you can click */
	transition: opacity 0.2s ease, text-decoration 0.2s ease;
}

/* default check style */
.note:has(> ul) li::before {
	content: '✓';
	position: absolute;
	left: 0;
	top: 0;
	font-weight: 800;
	font-size: 0.95em;
	line-height: 1.4;
	color: color-mix(in oklab, var(--ink) 90%, var(--p3) 10%);
	background: color-mix(in oklab, var(--card) 92%, var(--p3) 8%);
	border: 1px solid var(--line);
	border-radius: 6px;
	padding: 0 0.35em;
	transform: translateY(-0.05em);
}

/* completed checklist items */
.note:has(> ul) li[data-done] {
	text-decoration: line-through;
	opacity: 0.6;
}

.note:has(> ul) li[data-done]::before {
	content: '✔'; /* bold check mark for done */
	color: var(--p3); /* mint green */
	background: none;
	border: none;
	font-weight: 900;
}

/* tighter spacing on small screens */
@media (max-width: 640px) {
	.note:has(> ul) li {
		margin: 5px 0;
	}
}

/* book list layout */
.book-list {
	list-style: none;
	padding: 0;
	margin: 0 0 1.25rem 0;
}

.book-list li {
	/* outer layout: give the whole row to text; sticky is absolutely positioned */
	display: grid;
	grid-template-columns: 1fr; /* full width for text */
	align-items: baseline;
	column-gap: 1rem;
	padding: 0.45rem 0;
	border-bottom: 1px dashed var(--ink-20, rgba(0, 0, 0, 0.15));
	overflow: visible; /* allow sticky to hang out */
	white-space: normal;
	isolation: isolate;
	position: relative; /* anchor for absolute sticky */
}

/* inner row: keep title + author together on one line */
.entry {
	display: flex; /* title + author stay inline */
	align-items: baseline;
	gap: 0.35rem;
	min-width: 0;
	flex: 1;
}

/* title (shrinks first) */
.entry em {
	font-style: italic;
	min-width: 0;
	white-space: nowrap; /* keep on one line */
	overflow: hidden;
	text-overflow: ellipsis; /* ellipsis before author pushes */
}

/* author — high contrast, never wraps */
.book-list .author {
	white-space: nowrap;
	color: var(--ink, #111) !important;
	font-size: 0.95rem;
	font-weight: 450;
	opacity: 1 !important;
	text-shadow: none !important;
	filter: none !important;
	mix-blend-mode: normal !important;
}

/* sticky note — hangs to the right, doesn't steal width */
.sticky {
	--sticky-bg: #e3e0f7;
	--sticky-ink: #1e1e1e;

	position: absolute;
	top: 50%;
	right: clamp(-240px, -20vw, -320px); /* 🚀 way out in the margin */
	transform: translateY(-50%);
	white-space: nowrap;
	padding: 0.35rem 0.6rem;
	border-radius: 0.35rem;
	background: var(--sticky-bg);
	color: var(--sticky-ink);
	border: 1px solid rgba(0, 0, 0, 0.08);
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
	font-size: 0.9rem;
	line-height: 1.2;
}

.sticky::before {
	content: '';
	position: absolute;
	top: -6px;
	left: 10px;
	width: 28px;
	height: 10px;
	background: #e0d9b5; /* tape */
	opacity: 0.85;
	transform: rotate(-4deg);
	box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

/* dark mode author + borders */
@media (prefers-color-scheme: dark) {
	.book-list li {
		border-bottom-color: rgba(255, 255, 255, 0.15);
	}
	.book-list .author {
		color: rgba(255, 255, 255, 0.92) !important;
		text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
	}
	.sticky {
		--sticky-bg: #cfc9ff; /* brighter for contrast on dark */
		--sticky-ink: #0f0f14;
		border-color: rgba(255, 255, 255, 0.1);
		box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
	}
	.sticky::before {
		background: #cfc7a1;
		opacity: 0.9;
	}
}
.dark .book-list li,
[data-theme='dark'] .book-list li {
	border-bottom-color: rgba(255, 255, 255, 0.15);
}
.dark .book-list .author,
[data-theme='dark'] .book-list .author {
	color: rgba(255, 255, 255, 0.92) !important;
	text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
}
.dark .sticky,
[data-theme='dark'] .sticky {
	--sticky-bg: #cfc9ff;
	--sticky-ink: #0f0f14;
	border-color: rgba(255, 255, 255, 0.1);
	box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}
.dark .sticky::before,
[data-theme='dark'] .sticky::before {
	background: #cfc7a1;
	opacity: 0.9;
}

/* small screens: bring sticky back in-flow or hide */
@media (max-width: 640px) {
	.book-list li {
		grid-template-columns: 1fr max-content;
	}
	.sticky {
		display: none !important; /* hide on mobile as requested */
	}
}

/* ultra-narrow: allow sticky to ellipsis if needed (when shown) */
@media (max-width: 420px) {
	.sticky {
		max-width: 45vw;
		overflow: hidden;
		text-overflow: ellipsis;
		white-space: nowrap;
	}
}

/* --- mobile nav improvements (scrollable pills + edge fades) --- */
@media (max-width: 640px) {
	.site-header {
		grid-template-columns: 1fr;
		row-gap: 8px;
		padding: 10px 12px;
		backdrop-filter: saturate(1.05) blur(6px);
		position: sticky;
		top: 0;
	}

	.header-note {
		display: none;
	}

	.brand {
		min-width: 0;
	}
	.brand-logo {
		height: 36px;
	}

	.site-nav {
		justify-self: stretch;
		display: grid;
		grid-auto-flow: column;
		grid-auto-columns: max-content;
		gap: 8px;
		margin: 0 -12px;
		padding: 2px 12px 8px;
		overflow-x: auto;
		overflow-y: hidden;
		overscroll-behavior-x: contain;
		-webkit-overflow-scrolling: touch;
		scroll-snap-type: x proximity;
	}

	.site-nav a {
		scroll-snap-align: start;
		padding: 10px 14px;
		border-radius: 999px;
		font-size: 0.95rem;
		background: color-mix(in oklab, var(--card) 88%, var(--p5) 12%);
		box-shadow: inset 0 0 0 1px var(--line);
		flex: 0 0 auto;
	}
	.site-nav a:hover {
		background: color-mix(in oklab, var(--card) 80%, var(--p5) 20%);
		color: var(--ink);
	}

	.toggle-group {
		order: 999;
		display: inline-flex;
		margin-left: auto;
	}
	.toggle-btn {
		padding: 8px 10px;
		font-size: 18px;
	}

	.site-header::before,
	.site-header::after {
		content: '';
		position: absolute;
		z-index: 1;
		top: 0;
		bottom: 0;
		width: 18px;
		pointer-events: none;
	}
	.site-header::before {
		left: 0;
		background: linear-gradient(to right, var(--bg), transparent);
	}
	.site-header::after {
		right: 0;
		background: linear-gradient(to left, var(--bg), transparent);
	}
}

/* smoother scroll without heavy animations for reduced motion */
@media (prefers-reduced-motion: reduce) {
	.site-nav {
		scroll-behavior: auto;
	}
	.card,
	.toggle-btn {
		transition: none;
	}
}