/* ==========================================================================
   Schematic: minimal engineering theme
   Tokens first; light is the default, dark follows the system or the toggle.
   ========================================================================== */

:root {
	--bg: #f3eee3;
	--surface: #f9f5ec;
	--surface-2: #ebe4d5;
	--text: #2b2620;
	--text-2: #5a5246;
	--muted: #8b8274;
	--line: #e1d9c8;
	--line-strong: #c6baa4;
	--accent: #2d4f9e;
	--accent-soft: rgba(45, 79, 158, 0.09);
	--ok: #2f7d4f;
	--warn: #a3661a;
	--danger: #b03a2e;
	--code-bg: #ece5d6;
	--term-bg: #1d1b17;
	--term-text: #ece6da;
	--term-muted: #9a9283;
	--grid: rgba(70, 52, 24, 0.06);

	--font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
	--font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

	--measure: 70ch;
	--wrap: 1080px;
	--radius: 4px;

	color-scheme: light;
}

/* Two modes: warm light (cream) and warm dark. No saved choice = follow the OS. */
@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--bg: #161512;
		--surface: #1d1c18;
		--surface-2: #25231f;
		--text: #ece6da;
		--text-2: #bdb5a6;
		--muted: #8a8274;
		--line: #2e2b26;
		--line-strong: #454138;
		--accent: #91a9f0;
		--accent-soft: rgba(145, 169, 240, 0.1);
		--ok: #6fcf97;
		--warn: #e0a84a;
		--danger: #f08070;
		--code-bg: #1a1916;
		--term-bg: #0f0e0c;
		--grid: rgba(255, 245, 225, 0.035);
		color-scheme: dark;
	}
}

:root[data-theme="dark"] {
	--bg: #161512;
	--surface: #1d1c18;
	--surface-2: #25231f;
	--text: #ece6da;
	--text-2: #bdb5a6;
	--muted: #8a8274;
	--line: #2e2b26;
	--line-strong: #454138;
	--accent: #91a9f0;
	--accent-soft: rgba(145, 169, 240, 0.1);
	--ok: #6fcf97;
	--warn: #e0a84a;
	--danger: #f08070;
	--code-bg: #1a1916;
	--term-bg: #0f0e0c;
	--grid: rgba(255, 245, 225, 0.035);
	color-scheme: dark;
}

/* ---------- Base ---------- */

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

html {
	font-size: 17px;
	-webkit-text-size-adjust: 100%;
	scroll-padding-top: 5rem;
}

body {
	margin: 0;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	background: var(--bg);
	color: var(--text);
	font-family: var(--font-sans);
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
}

main {
	flex: 1;
}

a {
	color: var(--accent);
	text-decoration-thickness: 1px;
	text-underline-offset: 0.18em;
}

a:hover {
	text-decoration-thickness: 2px;
}

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

h1,
h2,
h3,
h4 {
	margin: 0;
	line-height: 1.2;
	font-weight: 600;
	letter-spacing: -0.015em;
	text-wrap: balance;
}

h1 {
	font-size: clamp(1.9rem, 4.2vw, 2.7rem);
	letter-spacing: -0.025em;
}

h2 {
	font-size: 1.35rem;
}

h3 {
	font-size: 1.05rem;
}

p {
	margin: 0 0 1em;
}

code,
kbd,
pre {
	font-family: var(--font-mono);
}

img {
	max-width: 100%;
}

[hidden] {
	display: none !important;
}

::selection {
	background: var(--accent);
	color: var(--bg);
}

.wrap {
	width: min(var(--wrap), 100% - 2rem);
	margin-inline: auto;
}

.wrap-wide {
	--wrap: 1500px;
}

.muted {
	color: var(--muted);
}

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

.skip-link {
	position: absolute;
	left: 1rem;
	top: -3rem;
	padding: 0.4rem 0.8rem;
	background: var(--text);
	color: var(--bg);
	z-index: 50;
}

.skip-link:focus {
	top: 1rem;
}

/* Small mono labels used everywhere */
.kicker,
.project-meta,
.post-tags,
.crumbs,
.fig-no,
.sec-no {
	font-family: var(--font-mono);
	font-size: 0.74rem;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--muted);
}

.kicker {
	margin: 0 0 0.6rem;
}

.lede {
	font-size: 1.12rem;
	color: var(--text-2);
	max-width: 60ch;
}

/* ---------- Header / footer ---------- */

.site-header {
	position: sticky;
	top: 0;
	z-index: 20;
	background: color-mix(in srgb, var(--bg) 88%, transparent);
	backdrop-filter: saturate(1.4) blur(8px);
	border-bottom: 1px solid var(--line);
}

.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	height: 3.6rem;
}

.brand {
	display: inline-flex;
	align-items: center;
	gap: 0.6rem;
	color: var(--text);
	text-decoration: none;
	font-family: var(--font-mono);
	font-weight: 600;
	font-size: 0.92rem;
}

/* A tiny "node" glyph: square with a connector */
.brand-mark {
	width: 0.85rem;
	height: 0.85rem;
	border: 1.5px solid var(--text);
	border-radius: 2px;
	position: relative;
}

.brand-mark::after {
	content: "";
	position: absolute;
	left: calc(100% + 1.5px);
	top: 50%;
	width: 0.35rem;
	height: 1.5px;
	background: var(--accent);
	transform: translateY(-50%);
}

.site-nav {
	display: flex;
	align-items: center;
	gap: 0.2rem;
}

.site-nav a {
	font-family: var(--font-mono);
	font-size: 0.85rem;
	color: var(--text-2);
	text-decoration: none;
	padding: 0.35rem 0.6rem;
	border-radius: var(--radius);
}

.site-nav a:hover {
	color: var(--text);
	background: var(--surface-2);
}

.site-nav a.active {
	color: var(--text);
	box-shadow: inset 0 -2px 0 var(--accent);
	border-radius: 0;
}

.theme-toggle {
	display: inline-grid;
	place-items: center;
	width: 2rem;
	height: 2rem;
	margin-left: 0.3rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: transparent;
	color: var(--text-2);
	cursor: pointer;
}

.theme-toggle:hover {
	color: var(--text);
	border-color: var(--line-strong);
}

.theme-toggle .icon-sun {
	display: none;
}

.theme-toggle[data-mode="dark"] .icon-sun {
	display: block;
}

.theme-toggle[data-mode="dark"] .icon-moon {
	display: none;
}

.site-footer {
	margin-top: 5rem;
	border-top: 1px solid var(--line);
	font-family: var(--font-mono);
	font-size: 0.78rem;
	color: var(--muted);
}

.footer-inner {
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-wrap: wrap;
	gap: 0.5rem 1.5rem;
	padding: 1.3rem 0 1.8rem;
}

.footer-inner p {
	margin: 0;
}

.status-line code {
	color: var(--text-2);
}

.status-dot {
	display: inline-block;
	width: 0.5rem;
	height: 0.5rem;
	margin-right: 0.4rem;
	border-radius: 50%;
	background: var(--ok);
	box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 20%, transparent);
	vertical-align: 0.05em;
}

.footer-sign span {
	font-style: italic;
}

.footer-links {
	display: flex;
	gap: 1rem;
}

.footer-links a {
	color: var(--text-2);
	text-decoration: none;
}

.footer-links a:hover {
	color: var(--accent);
}

/* ---------- Buttons, chips ---------- */

.btn {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
	padding: 0.55rem 1rem;
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	background: var(--surface);
	color: var(--text);
	font-family: var(--font-mono);
	font-size: 0.82rem;
	font-weight: 500;
	text-decoration: none;
	cursor: pointer;
	transition: border-color 120ms, background 120ms;
}

.btn:hover {
	border-color: var(--text);
}

.btn-primary {
	background: var(--text);
	border-color: var(--text);
	color: var(--bg);
}

.btn-primary:hover {
	background: var(--accent);
	border-color: var(--accent);
}

.btn-small {
	padding: 0.3rem 0.65rem;
	font-size: 0.74rem;
}

.btn-danger {
	color: var(--danger);
	border-color: color-mix(in srgb, var(--danger) 45%, transparent);
}

.btn-danger:hover {
	border-color: var(--danger);
}

.actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.6rem;
	margin-top: 1.6rem;
}

.filter-bar {
	display: flex;
	flex-wrap: wrap;
	gap: 0.4rem;
	margin: 1rem 0 0.5rem;
}

.chip {
	font-family: var(--font-mono);
	font-size: 0.75rem;
	color: var(--text-2);
	background: transparent;
	border: 1px solid var(--line);
	border-radius: 999px;
	padding: 0.2rem 0.7rem;
	cursor: pointer;
}

.chip span {
	color: var(--muted);
}

.chip:hover {
	border-color: var(--line-strong);
	color: var(--text);
}

.chip.is-active {
	background: var(--text);
	border-color: var(--text);
	color: var(--bg);
}

.chip.is-active span {
	color: inherit;
}

/* ---------- Page structure ---------- */

.page-head {
	padding: 3.5rem 0 1.5rem;
}

.page-head h1 {
	max-width: 22ch;
	margin-bottom: 0.9rem;
}

.section {
	margin-top: 4.2rem;
}

.section-head {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	gap: 1rem;
	padding-bottom: 0.7rem;
	margin-bottom: 0.4rem;
	border-bottom: 1px solid var(--line);
}

.section-head h2 {
	font-size: 1.05rem;
	display: flex;
	align-items: baseline;
	gap: 0.7rem;
}

.sec-no {
	color: var(--accent);
}

.more {
	font-family: var(--font-mono);
	font-size: 0.8rem;
	text-decoration: none;
}

/* ---------- Home ---------- */

.hero {
	display: grid;
	grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
	gap: 3rem;
	align-items: end;
	padding: 4.5rem 0 2.5rem;
}

.hero h1 {
	max-width: 20ch;
	margin-bottom: 1.1rem;
}

/* Spec sheet: definition list in a ruled box */
.spec {
	margin: 0;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
	font-size: 0.88rem;
}

.spec div {
	display: grid;
	grid-template-columns: 5.5rem 1fr;
	gap: 0.8rem;
	padding: 0.55rem 0.9rem;
	border-bottom: 1px dashed var(--line);
}

.spec div:last-child {
	border-bottom: 0;
}

.spec dt {
	font-family: var(--font-mono);
	font-size: 0.76rem;
	color: var(--muted);
	padding-top: 0.12rem;
}

.spec dd {
	margin: 0;
	color: var(--text);
	overflow-wrap: anywhere;
}

.spec a {
	color: inherit;
}

/* Pipeline diagram */
.pipeline {
	margin: 1rem 0 0;
	padding: 1.4rem 1.4rem 1rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background-color: var(--surface);
	background-image:
		linear-gradient(var(--grid) 1px, transparent 1px),
		linear-gradient(90deg, var(--grid) 1px, transparent 1px);
	background-size: 20px 20px;
	position: relative;
}

/* Registration marks in the corners, like a technical drawing */
.pipeline::before,
.pipeline::after {
	content: "";
	position: absolute;
	width: 10px;
	height: 10px;
	border-color: var(--line-strong);
	border-style: solid;
}

.pipeline::before {
	top: 6px;
	left: 6px;
	border-width: 1px 0 0 1px;
}

.pipeline::after {
	bottom: 6px;
	right: 6px;
	border-width: 0 1px 1px 0;
}

.pipeline-scroll {
	overflow-x: auto;
}

.pipeline svg {
	display: block;
	width: 100%;
	min-width: 640px;
	height: auto;
	font-family: var(--font-mono);
}

.pl-node rect {
	fill: var(--surface);
	stroke: var(--line-strong);
	stroke-width: 1;
}

.pl-node.is-accent rect {
	stroke: var(--accent);
	fill: var(--accent-soft);
}

.pl-label {
	fill: var(--text);
	font-size: 15px;
	font-weight: 600;
}

.pl-sub {
	fill: var(--muted);
	font-size: 12px;
}

.pl-index {
	fill: var(--muted);
	font-size: 11px;
}

.pl-edge {
	stroke: var(--line-strong);
	stroke-width: 1.25;
	stroke-dasharray: 4 4;
	animation: march 1.2s linear infinite;
}

.pl-packet {
	fill: var(--accent);
	animation: packet 2.4s ease-in-out infinite;
	transform: translateX(var(--x0));
}

@keyframes march {
	to {
		stroke-dashoffset: -8;
	}
}

@keyframes packet {
	0% {
		transform: translateX(var(--x0));
		opacity: 0;
	}
	15% {
		opacity: 1;
	}
	70% {
		transform: translateX(var(--x1));
		opacity: 1;
	}
	100% {
		transform: translateX(var(--x1));
		opacity: 0;
	}
}

/* Stacked version of the diagram for narrow screens */
.pipeline-steps {
	display: none;
	list-style: none;
	margin: 0;
	padding: 0;
	font-family: var(--font-mono);
}

.pipeline-steps li {
	display: grid;
	grid-template-columns: 1.8rem 1fr;
	gap: 0.5rem;
	position: relative;
	padding: 0.5rem 0.8rem;
	border: 1px solid var(--line-strong);
	border-radius: 3px;
	background: var(--surface);
	font-size: 0.85rem;
	font-weight: 600;
}

.pipeline-steps li + li {
	margin-top: 1.1rem;
}

.pipeline-steps li + li::before {
	content: "";
	position: absolute;
	left: 1.4rem;
	top: calc(-1.1rem - 1px);
	height: 1.1rem;
	border-left: 1.25px dashed var(--line-strong);
}

.pipeline-steps li.is-accent {
	border-color: var(--accent);
	background: var(--accent-soft);
}

.pipeline-steps span {
	color: var(--muted);
	font-size: 0.72rem;
	font-weight: 400;
	padding-top: 0.12rem;
}

.pipeline-steps small {
	display: block;
	color: var(--muted);
	font-size: 0.75rem;
	font-weight: 400;
}

.pipeline figcaption {
	margin-top: 0.8rem;
	font-size: 0.85rem;
	color: var(--text-2);
}

.fig-no {
	margin-right: 0.5rem;
	color: var(--accent);
}

.focus-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 2rem;
	padding-top: 1rem;
}

.focus-grid h3 {
	margin-bottom: 0.4rem;
}

.focus-grid p {
	color: var(--text-2);
	font-size: 0.95rem;
	margin: 0;
}

/* ---------- Lists: posts & projects ---------- */

.post-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

.post-row {
	display: grid;
	grid-template-columns: 6.5rem minmax(0, 1fr) auto;
	gap: 1rem;
	align-items: baseline;
	padding: 0.85rem 0;
	border-bottom: 1px solid var(--line);
}

.post-row time {
	font-family: var(--font-mono);
	font-size: 0.8rem;
	color: var(--muted);
}

.post-title {
	color: var(--text);
	font-weight: 500;
	text-decoration: none;
}

.post-title:hover {
	color: var(--accent);
}

.post-meta {
	font-family: var(--font-mono);
	font-size: 0.75rem;
	color: var(--muted);
	white-space: nowrap;
}

.post-tags {
	display: flex;
	flex-wrap: wrap;
	gap: 0.3rem 0.9rem;
	margin: 0;
	text-transform: none;
}

.project-list {
	display: grid;
}

.project-row {
	padding: 1.3rem 0;
	border-bottom: 1px solid var(--line);
}

.project-row h2,
.project-row h3 {
	font-size: 1.08rem;
	margin: 0.3rem 0 0.4rem;
}

.project-row p {
	color: var(--text-2);
	max-width: var(--measure);
	margin-bottom: 0.6rem;
}

.project-meta {
	margin: 0;
}

.stack {
	display: flex;
	flex-wrap: wrap;
	gap: 0.35rem;
	margin: 0;
}

.stack span {
	font-family: var(--font-mono);
	font-size: 0.72rem;
	color: var(--text-2);
	background: var(--surface-2);
	border-radius: 3px;
	padding: 0.1rem 0.45rem;
}

.callout {
	padding: 1.4rem 1.5rem;
	border: 1px solid var(--line);
	border-left: 3px solid var(--accent);
	border-radius: var(--radius);
	background: var(--surface);
	margin-bottom: 1.5rem;
}

.callout h2 {
	font-size: 1.15rem;
	margin-bottom: 0.6rem;
}

.callout ul {
	margin: 0;
	padding-left: 1.1rem;
	color: var(--text-2);
	font-size: 0.95rem;
}

.empty-state {
	padding: 2.5rem 0;
	text-align: center;
	color: var(--muted);
	font-family: var(--font-mono);
	font-size: 0.9rem;
}

/* ---------- Blog index ---------- */

.search {
	position: relative;
	display: flex;
	align-items: center;
}

.search input {
	width: 100%;
	padding: 0.8rem 4.5rem 0.8rem 2.6rem;
	font: inherit;
	font-size: 1rem;
	color: var(--text);
	background: var(--surface);
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
}

.search input:focus {
	outline: none;
	border-color: var(--accent);
	box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-icon {
	position: absolute;
	left: 0.9rem;
	font-family: var(--font-mono);
	font-size: 0.8rem;
	color: var(--muted);
	border: 1px solid var(--line-strong);
	border-radius: 3px;
	padding: 0 0.3rem;
	line-height: 1.3;
}

.search-status {
	position: absolute;
	right: 1rem;
	font-family: var(--font-mono);
	font-size: 0.78rem;
	color: var(--muted);
}

.series-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
	gap: 1rem;
	padding-top: 1rem;
}

.series-card {
	padding: 1.1rem 1.2rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.series-card h3 {
	margin: 0.3rem 0 0.6rem;
}

.series-card h3 a {
	color: var(--text);
	text-decoration: none;
}

.series-card ol {
	margin: 0;
	padding-left: 1.2rem;
	font-size: 0.9rem;
	color: var(--muted);
}

.series-card ol a {
	color: var(--text-2);
}

/* Post tiles: square-ish cards in an N x M grid */
.tiles {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
	gap: 1rem;
	padding-top: 1rem;
}

.tile {
	aspect-ratio: 1 / 1;
	min-height: 0;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
	transition: border-color 140ms, transform 140ms;
	overflow: hidden;
}

.tile:hover {
	border-color: var(--line-strong);
	transform: translateY(-2px);
}

.tile-link {
	display: flex;
	flex-direction: column;
	height: 100%;
	padding: 1rem 1.05rem;
	color: inherit;
	text-decoration: none;
}

.tile-cover {
	display: block;
	width: calc(100% + 2.1rem);
	margin: -1rem -1.05rem 0.8rem;
	aspect-ratio: 16 / 9;
	object-fit: cover;
	border-bottom: 1px solid var(--line);
}

.tile-top {
	display: flex;
	justify-content: space-between;
	gap: 0.5rem;
	margin: 0 0 0.9rem;
	font-family: var(--font-mono);
	font-size: 0.72rem;
	color: var(--muted);
}

.tile-title {
	font-size: 1.08rem;
	line-height: 1.3;
	margin-bottom: 0.55rem;
	color: var(--text);
}

.tile:hover .tile-title {
	color: var(--accent);
}

.tile-excerpt {
	margin: 0;
	font-size: 0.88rem;
	line-height: 1.5;
	color: var(--text-2);
	display: -webkit-box;
	-webkit-line-clamp: 4;
	-webkit-box-orient: vertical;
	overflow: hidden;
}

.tile-tags {
	display: flex;
	flex-wrap: wrap;
	gap: 0.25rem 0.7rem;
	margin: auto 0 0;
	padding-top: 0.8rem;
	font-family: var(--font-mono);
	font-size: 0.7rem;
	color: var(--muted);
}

.tile-series {
	color: var(--accent);
}

/* Writing page: compact header, big 2-column tiles */
.page-head-compact {
	display: flex;
	align-items: baseline;
	flex-wrap: wrap;
	gap: 0.4rem 1.2rem;
	padding: 2.2rem 0 1.1rem;
}

.page-head-compact h1 {
	font-size: 1.6rem;
	margin: 0;
}

.page-head-compact .kicker {
	margin: 0;
}

.page-head-compact .kicker a {
	color: var(--accent);
}

.tiles-large {
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 1.2rem;
	padding-top: 1.4rem;
}

.tiles-large .tile {
	aspect-ratio: 5 / 4;
}

.tiles-large .tile-link {
	padding: 1.6rem 1.7rem;
}

.tiles-large .tile-cover {
	width: calc(100% + 3.4rem);
	margin: -1.6rem -1.7rem 1.2rem;
}

.tiles-large .tile-top {
	font-size: 0.8rem;
	margin-bottom: 1.3rem;
}

.tiles-large .tile-title {
	font-size: clamp(1.25rem, 2.2vw, 1.65rem);
	line-height: 1.25;
	margin-bottom: 0.8rem;
}

.tiles-large .tile-excerpt {
	font-size: 1rem;
	line-height: 1.6;
	-webkit-line-clamp: 6;
}

.tiles-large .tile-tags {
	font-size: 0.78rem;
}

/* ---------- Article ---------- */

.read-progress {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: 2px;
	z-index: 30;
	pointer-events: none;
}

.read-progress span {
	display: block;
	height: 100%;
	background: var(--accent);
	transform: scaleX(0);
	transform-origin: left;
}

.article-layout {
	display: grid;
	grid-template-columns: minmax(0, var(--measure));
	justify-content: center;
	gap: 4rem;
}

.article-layout.has-toc {
	grid-template-columns: minmax(0, var(--measure)) 14rem;
	justify-content: space-between;
}

.article-head {
	padding: 3.2rem 0 1.4rem;
	border-bottom: 1px solid var(--line);
	margin-bottom: 2rem;
}

.crumbs {
	text-transform: none;
	margin: 0 0 1rem;
}

.crumbs a {
	color: var(--muted);
}

.article-head h1 {
	margin-bottom: 1rem;
}

.article-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 0.3rem 1rem;
	margin: 0;
	font-family: var(--font-mono);
	font-size: 0.8rem;
	color: var(--muted);
}

.article-meta a {
	color: var(--muted);
	text-decoration: none;
}

.article-meta a:hover {
	color: var(--accent);
}

.article-cover {
	display: block;
	width: 100%;
	border-radius: var(--radius);
	border: 1px solid var(--line);
	margin-bottom: 2rem;
}

.pdf-frame {
	width: 100%;
	min-height: 85vh;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.series-box {
	margin-bottom: 2rem;
	padding: 1rem 1.2rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.series-box .kicker {
	margin-bottom: 0.2rem;
}

.series-name {
	font-weight: 600;
	margin-bottom: 0.5rem;
}

.series-box ol {
	margin: 0;
	padding-left: 1.3rem;
	font-size: 0.92rem;
	color: var(--muted);
}

.series-box li.is-current {
	color: var(--text);
	font-weight: 500;
}

.toc {
	position: sticky;
	top: 5rem;
	align-self: start;
	margin-top: 3.4rem;
	font-size: 0.84rem;
}

.toc ol {
	list-style: none;
	margin: 0;
	padding: 0;
	border-left: 1px solid var(--line);
}

.toc li {
	margin: 0;
}

.toc a {
	display: block;
	padding: 0.25rem 0 0.25rem 0.9rem;
	margin-left: -1px;
	color: var(--muted);
	text-decoration: none;
	border-left: 1px solid transparent;
	line-height: 1.4;
}

.toc .toc-3 a {
	padding-left: 1.7rem;
	font-size: 0.8rem;
}

.toc a:hover {
	color: var(--text);
}

.toc a.is-active {
	color: var(--accent);
	border-left-color: var(--accent);
}

.article-foot {
	margin-top: 3.5rem;
	padding-top: 1.5rem;
	border-top: 1px solid var(--line);
}

.post-nav {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
}

.post-nav-link {
	display: block;
	padding: 0.9rem 1rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	color: var(--text);
	text-decoration: none;
	font-weight: 500;
}

.post-nav-link .kicker {
	display: block;
	margin-bottom: 0.2rem;
}

.post-nav-link:hover {
	border-color: var(--accent);
}

.post-nav-link.is-next {
	text-align: right;
	grid-column: 2;
}

/* ---------- Prose (Markdown output) ---------- */

.prose {
	font-size: 1.04rem;
	color: var(--text);
	overflow-wrap: break-word;
}

.prose > :first-child {
	margin-top: 0;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose table,
.prose figure,
.prose pre,
.prose details {
	margin: 0 0 1.3rem;
}

.prose h2,
.prose h3,
.prose h4 {
	position: relative;
	margin: 2.6rem 0 0.8rem;
}

.prose h2 {
	font-size: 1.45rem;
}

.prose h3 {
	font-size: 1.15rem;
}

.prose .anchor {
	position: absolute;
	left: -1.1em;
	color: var(--line-strong);
	text-decoration: none;
	font-weight: 400;
	opacity: 0;
}

.prose h2:hover .anchor,
.prose h3:hover .anchor,
.prose h4:hover .anchor {
	opacity: 1;
}

.prose ul,
.prose ol {
	padding-left: 1.4rem;
}

.prose li + li {
	margin-top: 0.35rem;
}

.prose li::marker {
	color: var(--muted);
}

.prose img {
	display: block;
	height: auto;
	margin: 1.8rem auto;
	border-radius: var(--radius);
	border: 1px solid var(--line);
}

.prose blockquote {
	padding: 0.2rem 0 0.2rem 1.1rem;
	border-left: 2px solid var(--accent);
	color: var(--text-2);
}

.prose blockquote p:last-child {
	margin-bottom: 0;
}

.prose hr {
	border: 0;
	height: 1px;
	background: var(--line);
	margin: 2.6rem 0;
}

.prose :not(pre) > code {
	font-size: 0.86em;
	background: var(--code-bg);
	border: 1px solid var(--line);
	border-radius: 3px;
	padding: 0.08em 0.32em;
}

.prose table {
	width: 100%;
	border-collapse: collapse;
	font-size: 0.92rem;
	display: block;
	overflow-x: auto;
}

.prose th,
.prose td {
	padding: 0.5rem 0.8rem;
	border-bottom: 1px solid var(--line);
	text-align: left;
}

.prose th {
	font-family: var(--font-mono);
	font-size: 0.75rem;
	font-weight: 500;
	text-transform: uppercase;
	letter-spacing: 0.04em;
	color: var(--muted);
	border-bottom-color: var(--line-strong);
}

.prose details {
	padding: 0.7rem 1rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.prose summary {
	cursor: pointer;
	font-weight: 500;
}

.prose details[open] summary {
	margin-bottom: 0.6rem;
}

/* Code blocks */
.code-block {
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--code-bg);
	overflow: hidden;
}

.code-bar,
.term-bar {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	min-height: 2rem;
	padding: 0 0.5rem 0 0.9rem;
	font-family: var(--font-mono);
	font-size: 0.72rem;
	color: var(--muted);
	border-bottom: 1px solid var(--line);
}

.code-lang {
	text-transform: lowercase;
}

.widget-btn {
	margin-left: auto;
	font: inherit;
	color: var(--muted);
	background: transparent;
	border: 1px solid transparent;
	border-radius: 3px;
	padding: 0.1rem 0.45rem;
	cursor: pointer;
}

.widget-btn + .widget-btn {
	margin-left: 0;
}

.widget-btn:hover {
	color: var(--text);
	border-color: var(--line-strong);
}

.prose pre {
	margin: 0;
	padding: 1rem 1.1rem;
	overflow-x: auto;
	font-size: 0.84rem;
	line-height: 1.6;
	tab-size: 2;
}

/* Terminal widget */
.term {
	border-radius: var(--radius);
	background: var(--term-bg);
	color: var(--term-text);
	overflow: hidden;
	border: 1px solid #000;
}

.term .term-bar {
	color: var(--term-muted);
	border-bottom-color: rgba(255, 255, 255, 0.08);
}

.term .widget-btn {
	color: var(--term-muted);
}

.term .widget-btn:hover {
	color: var(--term-text);
	border-color: rgba(255, 255, 255, 0.2);
}

.term-dots {
	width: 0.5rem;
	height: 0.5rem;
	border-radius: 50%;
	background: #ff5f57;
	box-shadow: 0.8rem 0 0 #febc2e, 1.6rem 0 0 #28c840;
	margin-right: 1.6rem;
	opacity: 0.85;
}

.prose .term-body {
	background: none;
	color: inherit;
	min-height: 3rem;
}

.term-line {
	display: block;
	white-space: pre;
}

.term-out {
	color: var(--term-muted);
}

.term-prompt {
	color: #7ee2a8;
	user-select: none;
}

.term-typing::after {
	content: "▋";
	color: var(--term-muted);
	animation: blink 1s steps(1) infinite;
}

@keyframes blink {
	50% {
		opacity: 0;
	}
}

.term-inline {
	display: inline-block;
	margin: 1rem 0 0;
	padding: 0.8rem 1.1rem;
	background: var(--term-bg);
	color: var(--term-text);
	border-radius: var(--radius);
	font-size: 0.85rem;
}

/* Generic container for custom interactive widgets in posts */
.widget {
	margin: 1.8rem 0;
	padding: 1.1rem 1.2rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.widget-caption {
	margin: 0.8rem 0 0;
	font-size: 0.85rem;
	color: var(--text-2);
}

/* ---------- Forms ---------- */

.contact-layout {
	display: grid;
	grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
	gap: 3rem;
	align-items: start;
}

.form {
	display: grid;
	gap: 0.35rem;
}

.form label,
.field > span:first-child {
	font-family: var(--font-mono);
	font-size: 0.75rem;
	color: var(--muted);
	margin-top: 0.6rem;
}

.form input,
.form textarea,
.editor input:not([type="checkbox"]),
.editor textarea {
	width: 100%;
	font: inherit;
	font-size: 0.98rem;
	color: var(--text);
	background: var(--surface);
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: 0.6rem 0.75rem;
}

.form input:focus,
.form textarea:focus,
.editor input:focus,
.editor textarea:focus {
	outline: none;
	border-color: var(--accent);
	box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-foot {
	display: flex;
	align-items: center;
	gap: 1rem;
	margin-top: 1rem;
}

.form-status {
	margin: 0;
	font-family: var(--font-mono);
	font-size: 0.8rem;
	color: var(--text-2);
}

/* ---------- Admin ---------- */

.stat-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 1rem;
	margin: 0;
}

.stat-grid div {
	padding: 1rem 1.2rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.stat-grid dt {
	font-family: var(--font-mono);
	font-size: 0.75rem;
	color: var(--muted);
}

.stat-grid dd {
	margin: 0.2rem 0 0;
	font-size: 1.8rem;
	font-weight: 600;
}

.admin-head {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	gap: 1rem;
	flex-wrap: wrap;
}

.admin-row {
	grid-template-columns: 4rem minmax(0, 1fr) auto;
	align-items: center;
}

.admin-row .post-tags {
	margin-top: 0.2rem;
}

.row-actions {
	display: flex;
	gap: 0.4rem;
}

.badge {
	justify-self: start;
	font-family: var(--font-mono);
	font-size: 0.68rem;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	padding: 0.1rem 0.45rem;
	border-radius: 3px;
	border: 1px solid currentColor;
}

.badge.is-live {
	color: var(--ok);
}

.badge.is-draft {
	color: var(--warn);
}

/* Editor */
.editor-main {
	padding-top: 1.2rem;
}

.editor {
	display: grid;
	gap: 0.9rem;
}

.editor-bar {
	position: sticky;
	top: 3.6rem;
	z-index: 5;
	display: flex;
	align-items: center;
	gap: 1rem;
	padding: 0.6rem 0.9rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.editor-back {
	white-space: nowrap;
	font-family: var(--font-mono);
	font-size: 0.82rem;
}

.editor-status {
	flex: 1;
	min-width: 0;
	margin: 0;
	font-family: var(--font-mono);
	font-size: 0.8rem;
	color: var(--muted);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.editor-status[data-tone="ok"] { color: var(--ok); }
.editor-status[data-tone="warn"] { color: var(--warn); }
.editor-status[data-tone="error"] { color: var(--danger); }

.editor-bar-actions {
	display: flex;
	gap: 0.5rem;
}

.editor-meta {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 0.2rem 1rem;
	padding: 0.6rem 1rem 1rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--surface);
}

.field {
	display: grid;
	gap: 0.25rem;
}

.field.wide {
	grid-column: span 2;
}

.field-row {
	display: flex;
	gap: 0.5rem;
}

.field.checkbox {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	align-self: end;
	padding-bottom: 0.6rem;
}

.field.checkbox span {
	margin: 0;
	font-family: var(--font-sans);
	font-size: 0.9rem;
	color: var(--text);
}

.field.checkbox input {
	width: 1.1rem;
	height: 1.1rem;
	accent-color: var(--accent);
}

.editor-toolbar {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.35rem;
}

.editor-toolbar button {
	font-family: var(--font-mono);
	font-size: 0.78rem;
	color: var(--text-2);
	background: var(--surface);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	padding: 0.3rem 0.6rem;
	cursor: pointer;
}

.editor-toolbar button:hover {
	color: var(--text);
	border-color: var(--line-strong);
}

.editor-hint {
	margin-left: auto;
	font-family: var(--font-mono);
	font-size: 0.75rem;
	color: var(--muted);
}

.preview-toggle {
	display: none;
}

.editor-panes {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
	min-height: 70vh;
}

.editor textarea {
	min-height: 70vh;
	resize: vertical;
	font-family: var(--font-mono);
	font-size: 0.85rem;
	line-height: 1.65;
	tab-size: 2;
}

.editor textarea.dragging {
	outline: 2px dashed var(--accent);
}

.editor-preview {
	padding: 1.2rem 1.5rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--bg);
	max-height: 80vh;
	overflow-y: auto;
}

.editor-empty {
	color: var(--muted);
}

/* ---------- Motion & responsive ---------- */

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

	.pl-packet {
		display: none;
	}
}

@media (max-width: 1100px) {
	.article-layout.has-toc {
		grid-template-columns: minmax(0, var(--measure));
		justify-content: center;
	}

	.toc {
		display: none;
	}
}

@media (max-width: 900px) {
	.hero,
	.contact-layout {
		grid-template-columns: 1fr;
		gap: 2rem;
	}

	.hero {
		padding-top: 3rem;
	}

	.focus-grid,
	.stat-grid {
		grid-template-columns: 1fr;
		gap: 1.2rem;
	}

	.editor-meta {
		grid-template-columns: 1fr;
	}

	.field.wide {
		grid-column: auto;
	}

	.editor-hint {
		display: none;
	}

	.preview-toggle {
		display: inline-block;
		margin-left: auto;
	}

	.editor-panes {
		grid-template-columns: 1fr;
	}

	.editor-preview {
		display: none;
	}

	.editor.show-preview .editor-preview {
		display: block;
	}

	.editor.show-preview textarea {
		display: none;
	}

	.editor-bar {
		flex-wrap: wrap;
	}
}

@media (max-width: 640px) {
	html {
		font-size: 16px;
	}

	.header-inner {
		height: auto;
		padding: 0.7rem 0;
		flex-wrap: wrap;
	}

	.site-nav {
		width: 100%;
		justify-content: space-between;
	}

	.site-nav a {
		padding: 0.3rem 0.4rem;
	}

	.post-row {
		grid-template-columns: 1fr;
		gap: 0.15rem;
	}

	.post-row .post-meta {
		display: none;
	}

	.tiles {
		grid-template-columns: repeat(2, minmax(0, 1fr));
		gap: 0.6rem;
	}

	.tile {
		aspect-ratio: auto;
		min-height: 11rem;
	}

	.tile-excerpt {
		-webkit-line-clamp: 3;
	}

	.tiles-large {
		grid-template-columns: 1fr;
	}

	.tiles-large .tile {
		aspect-ratio: auto;
		min-height: 14rem;
	}

	.tiles-large .tile-link {
		padding: 1.2rem 1.2rem;
	}

	.tiles-large .tile-cover {
		width: calc(100% + 2.4rem);
		margin: -1.2rem -1.2rem 1rem;
	}

	.tiles-large .tile-top span {
		display: inline;
	}

	.tile-link {
		padding: 0.85rem 0.8rem;
	}

	.tile-top span {
		display: none;
	}

	.tile-title {
		font-size: 0.98rem;
	}

	.admin-row {
		grid-template-columns: 1fr;
	}

	.post-nav {
		grid-template-columns: 1fr;
	}

	.post-nav-link.is-next {
		grid-column: auto;
	}

	.page-head {
		padding-top: 2.4rem;
	}

	.pipeline-scroll {
		display: none;
	}

	.pipeline-steps {
		display: block;
	}
}

/* Example widget: backoff visualiser (public/blog-assets/demos/backoff.js) */
.bo-controls {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.6rem 1.2rem;
	font-family: var(--font-mono);
	font-size: 0.78rem;
	color: var(--text-2);
}

.bo-controls label {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
}

.bo-controls input[type="range"] {
	width: 6.5rem;
	accent-color: var(--accent);
}

.bo-controls output {
	min-width: 3.5rem;
	color: var(--text);
}

.bo-check input {
	accent-color: var(--accent);
}

.bo-chart {
	display: block;
	width: 100%;
	height: auto;
	margin-top: 0.8rem;
	font-family: var(--font-mono);
	font-size: 11px;
}

.bo-chart text {
	fill: var(--muted);
}

.bo-ceil {
	fill: var(--accent-soft);
	stroke: var(--accent);
	stroke-dasharray: 3 3;
}

.bo-act {
	fill: var(--accent);
	transition: height 200ms, y 200ms;
}

.bo-axis {
	stroke: var(--line-strong);
}

/* ---------- CV ---------- */

.cv-head {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	gap: 1.5rem;
	flex-wrap: wrap;
	border-bottom: 1px solid var(--line);
	margin-bottom: 2rem;
}

.cv-head .lede {
	margin: 0;
}

.cv-actions {
	margin-top: 0;
}

.cv-layout {
	display: grid;
	grid-template-columns: 17rem minmax(0, 1fr);
	gap: 3.5rem;
	align-items: start;
}

.cv-side {
	position: sticky;
	top: 5rem;
	display: grid;
	gap: 1.8rem;
}

.cv-label {
	display: flex;
	align-items: baseline;
	gap: 0.6rem;
	margin: 0 0 0.8rem;
	font-family: var(--font-mono);
	font-size: 0.78rem;
	font-weight: 500;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--muted);
}

.cv-side .spec div {
	grid-template-columns: 4.6rem 1fr;
	font-size: 0.84rem;
}

.cv-skill-group {
	margin: 0.8rem 0 0.35rem;
	font-size: 0.84rem;
	font-weight: 500;
}

.cv-edu {
	font-size: 0.9rem;
	line-height: 1.55;
}

.cv-section + .cv-section {
	margin-top: 2.8rem;
}

.cv-section > .cv-label {
	padding-bottom: 0.6rem;
	border-bottom: 1px solid var(--line);
}

.cv-entry {
	display: grid;
	grid-template-columns: 8.5rem minmax(0, 1fr);
	gap: 1.2rem;
	padding: 1.2rem 0;
	border-bottom: 1px dashed var(--line);
}

.cv-entry-flat {
	grid-template-columns: minmax(0, 1fr);
}

.cv-entry:last-child {
	border-bottom: 0;
}

.cv-period {
	margin: 0.15rem 0 0;
	font-family: var(--font-mono);
	font-size: 0.75rem;
	color: var(--muted);
}

.cv-entry h3 {
	font-size: 1.02rem;
	margin-bottom: 0.25rem;
}

.cv-entry .project-meta a {
	color: var(--accent);
	text-transform: none;
}

.cv-list {
	margin: 0.6rem 0 0.8rem;
	padding-left: 1.1rem;
	font-size: 0.93rem;
	color: var(--text-2);
}

.cv-list li + li {
	margin-top: 0.25rem;
}

.cv-list li::marker {
	color: var(--muted);
}

@media (max-width: 900px) {
	.cv-layout {
		grid-template-columns: 1fr;
		gap: 2.5rem;
	}

	.cv-side {
		position: static;
	}
}

@media (max-width: 640px) {
	.cv-entry {
		grid-template-columns: 1fr;
		gap: 0.2rem;
	}
}

@media print {
	.site-header,
	.site-footer,
	.cv-actions,
	.skip-link {
		display: none !important;
	}

	:root {
		--bg: #fff;
		--surface: #fff;
		--text: #000;
		--text-2: #222;
		--muted: #555;
		--line: #ccc;
	}

	html {
		font-size: 9pt;
	}

	@page {
		margin: 14mm 14mm;
	}

	.page-head {
		padding-top: 0;
	}

	.cv-layout {
		grid-template-columns: 1fr;
		gap: 1.2rem;
	}

	.cv-side {
		grid-template-columns: 1fr 1fr;
		gap: 1rem 2rem;
	}

	.cv-entry {
		padding: 0.7rem 0;
	}

	.cv-entry:not(.cv-entry-flat) {
		grid-template-columns: 7rem 1fr;
	}

	.cv-side {
		position: static;
	}

	body {
		display: block;
		min-height: 0;
	}

	.cv-entry h3,
	.cv-label {
		break-after: avoid;
	}

	.cv-list li {
		break-inside: avoid;
	}

	a {
		color: inherit;
		text-decoration: none;
	}
}

/* ---------- Feed page ---------- */

.feed-box {
	display: flex;
	align-items: center;
	gap: 0.8rem;
	max-width: 44rem;
	padding: 0.6rem 0.6rem 0.6rem 1rem;
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	background: var(--surface);
}

.feed-box code {
	flex: 1;
	min-width: 0;
	overflow-x: auto;
	white-space: nowrap;
	font-size: 0.9rem;
}

.feed-raw {
	margin-top: 0.8rem;
	font-size: 0.9rem;
}