style.css

/* Base layout */

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

:root {
	/* Hybrid type system — mono carries the terminal identity on headings,
	 * nav, buttons, and labels; sans carries long-form reading comfort in
	 * body copy. Both are system stacks: zero CDN font dependencies. */
	--font-sans: system-ui, -apple-system, "Segoe UI", Roboto,
		"Helvetica Neue", Arial, sans-serif;
	--font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas,
		"Courier New", monospace;

	/* DARK THEME DEFAULT */
	--bg-gradient: radial-gradient(circle at top,
			#0b1120 0,
			#020617 55%,
			#000000 100%);
	--bg: #050816;
	--bg-elevated: #0b1020;
	--accent: #4ade80;
	--accent-soft: rgba(74, 222, 128, 0.15);
	--accent-2: #38bdf8;
	--text-main: #e5e7eb;
	--text-muted: #9ca3af;
	--border-strong: #1f2933;
	--danger: #f97373;
	/* Dark ink used on accent-filled surfaces (buttons, markers). Same value
	 * in both themes — the fills it sits on are always the bright accents. */
	--text-on-accent: #022c22;

	--radius-pixel: 0;
	--shadow-pixel: 0 0 0 2px #000000, 4px 4px 0 0 #000000;

	color-scheme: dark;
}

/* Light theme overrides */
:root[data-theme="light"] {
	--bg-gradient: radial-gradient(circle at top,
			#e5e7eb 0,
			#cbd5f5 55%,
			#e5e7eb 100%);
	--bg: #f3f4f6;
	--bg-elevated: #ffffff;
	/* One shade darker than the dark-theme accents — the originals fell short
	 * of WCAG AA 4.5:1 as text on the light backgrounds (green was ~3.8:1,
	 * blue ~3.7:1). These hit ~4.6:1 and ~5.3:1 respectively. */
	--accent: #15803d;
	--accent-soft: rgba(21, 128, 61, 0.12);
	--accent-2: #0369a1;
	--text-main: #0f172a;
	--text-muted: #4b5563;
	--border-strong: #e5e7eb;
	--danger: #b91c1c;
	--shadow-pixel: 0 0 0 1px #d1d5db, 3px 3px 0 0 #9ca3af;

	color-scheme: light;
}

/* Explicit dark override */
:root[data-theme="dark"] {
	color-scheme: dark;
}

html,
body {
	margin: 0;
	padding: 0;
	background: var(--bg-gradient);
	color: var(--text-main);
	/* Sans for body reading; identity elements opt back into mono below. */
	font-family: var(--font-sans);
	scroll-behavior: smooth;
}

body {
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}

/* Terminal identity — everything that labels rather than reads stays mono:
 * headings, nav, buttons, eyebrows, tags, and inline code. */
h1,
h2,
h3,
h4,
h5,
h6,
code,
.eyebrow,
.main-nav a,
.btn,
.theme-label,
.toggle-button,
.card-title,
.hero-focus,
.popup-title,
.rev-tag,
.rev-q .q-num,
.endpoint-title,
.skip-link,
.footer-dot {
	font-family: var(--font-mono);
}

/* Improve anchor link behaviour with sticky header */
.hero,
.section {
	scroll-margin-top: 5rem;
}

/* Skip link — off-screen until keyboard focus lands on it, then drops in at
 * the top-left so keyboard and screen-reader users can bypass the header. */
.skip-link {
	position: absolute;
	top: -100%;
	left: 0.75rem;
	z-index: 100;
	padding: 0.6rem 1rem;
	background: var(--bg-elevated);
	color: var(--accent);
	border: 2px solid var(--accent);
	text-decoration: none;
}

.skip-link:focus {
	top: 0.75rem;
}

/* Visually hidden (for a11y labels) */

.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	border: 0;
}

/* Header */

.site-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1.25rem 5vw;
	position: sticky;
	top: 0;
	z-index: 20;
	backdrop-filter: blur(12px);
	background: linear-gradient(to bottom,
			rgba(2, 6, 23, 0.95),
			rgba(2, 6, 23, 0.75));
	border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

:root[data-theme="light"] .site-header {
	background: linear-gradient(to bottom,
			rgba(243, 244, 246, 0.96),
			rgba(243, 244, 246, 0.9));
	border-bottom-color: rgba(148, 163, 184, 0.4);
}

/* Logo – link to top, consistent accent green, proper hover + click feedback */
.logo {
	font-family: var(--font-mono);
	font-weight: 700;
	letter-spacing: 0.08em;
	font-size: 0.95rem;
	text-transform: uppercase;
	color: var(--accent);
	/* always correct green */
	text-decoration: none;
	display: inline-flex;
	align-items: center;

	/* smooth transitions */
	transition: color 150ms ease, background 150ms ease, transform 120ms ease,
		box-shadow 150ms ease;
}

/* Always stay accent, even after clicking visited */
.logo:visited {
	color: var(--accent);
}

/* Hover: accent-2 glow from your theme */
.logo:hover {
	color: var(--accent-2);
	background: var(--accent-soft);
	box-shadow: 0 0 14px rgba(56, 189, 248, 0.6);
	transform: translateY(-1px);
}

/* Click / active press */
.logo:active {
	transform: scale(0.92);
	color: var(--accent);
	/* snaps back to green */
	background: none;
	box-shadow: none;
	animation: click-pulse 180ms ease-out;
}

/* Header right controls */

.header-controls {
	display: flex;
	align-items: center;
	gap: 1rem;
}

/* Theme selector */

.theme-switcher {
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.theme-label {
	font-size: 0.75rem;
	text-transform: uppercase;
	letter-spacing: 0.14em;
	color: var(--text-muted);
}

.theme-toggle {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	/* 44px — WCAG touch-target minimum */
	width: 2.75rem;
	height: 2.75rem;
	padding: 0;
	border-radius: 999px;
	border: 1px solid rgba(148, 163, 184, 0.5);
	background: var(--bg-elevated);
	color: var(--text-main);
	font-size: 0.95rem;
	line-height: 1;
	cursor: pointer;
	transition: border-color 150ms ease, background 150ms ease,
		transform 120ms ease;
}

.theme-toggle:hover {
	border-color: var(--accent);
	transform: translateY(-1px);
}

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

.theme-toggle .theme-icon {
	display: inline-block;
	font-size: 1rem;
}

/* Main nav */

.main-nav {
	display: flex;
	gap: 1.5rem;
	font-size: 0.9rem;
}

.main-nav a {
	position: relative;
	color: var(--text-muted);
	text-decoration: none;
	text-transform: uppercase;
	letter-spacing: 0.14em;
	font-size: 0.75rem;
	padding-bottom: 0.25rem;
	border-bottom: 1px solid transparent;
	/* fallback */
}

/* Underline base (hidden) – sized to the text itself */
.main-nav a::after {
	content: "";
	position: absolute;
	left: 0;
	bottom: 0;
	height: 2px;
	background-color: var(--accent);
	width: 100%;
	/* only as wide as the text content */
	transform: scaleX(0);
	/* animate in from left */
	transform-origin: left;
	transition: transform 200ms ease-out;
}

/* Hover state */
.main-nav a:hover {
	color: var(--accent);
	border-bottom-color: transparent;
}

.main-nav a:hover::after {
	transform: scaleX(1);
}

/* Keyboard focus gets the same underline affordance as hover — focus parity. */
.main-nav a:focus-visible {
	color: var(--accent);
	outline: 2px solid var(--accent-2);
	outline-offset: 3px;
}

.main-nav a:focus-visible::after {
	transform: scaleX(1);
}

/* Hamburger button */

.menu-toggle {
	display: none;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap: 4px;
	/* 44px — WCAG touch-target minimum */
	width: 44px;
	height: 44px;
	border-radius: 6px;
	border: 1px solid rgba(148, 163, 184, 0.5);
	background: transparent;
	cursor: pointer;
	transition: background 150ms ease, box-shadow 150ms ease, transform 120ms ease;
}

.menu-toggle:hover {
	color: var(--accent-2);
	background: var(--accent-soft);
	box-shadow: 0 0 14px rgba(56, 189, 248, 0.6);
	transform: translateY(-1px);
}

.menu-toggle-bar {
	width: 18px;
	height: 2px;
	background: var(--text-main);
	border-radius: 999px;
	transition: transform 180ms ease, opacity 180ms ease, box-shadow 180ms ease,
		background-color 180ms ease;
}

/* Click / press effect */
.menu-toggle:active {
	transform: scale(0.94);
	box-shadow: 0 0 0 1px var(--accent-2);
}

/* Open state -> X with glow */
.menu-toggle.open {
	background: rgba(15, 23, 42, 0.9);
	box-shadow: 0 0 12px rgba(56, 189, 248, 0.55);
}

:root[data-theme="light"] .menu-toggle.open {
	background: rgba(255, 255, 255, 0.95);
}

.menu-toggle.open .menu-toggle-bar:nth-child(1) {
	transform: translateY(6px) rotate(45deg);
	box-shadow: 0 0 8px var(--accent-2);
}

.menu-toggle.open .menu-toggle-bar:nth-child(2) {
	opacity: 0;
}

.menu-toggle.open .menu-toggle-bar:nth-child(3) {
	transform: translateY(-6px) rotate(-45deg);
	box-shadow: 0 0 8px var(--accent-2);
}

/* Hero — text block with CTAs beneath */

.hero {
	display: block;
	/* top | left+right | bottom — bottom halved to tighten the gap into
	 * the About section while preserving generous top breathing room. */
	padding: clamp(1.5rem, 3vw + 0.5rem, 2.5rem) clamp(1rem, 2vw, 1.5rem) clamp(0.75rem, 1.5vw + 0.25rem, 1.25rem);
	max-width: 1280px;
	margin: 0 auto;
}

.hero-text {
	min-width: 0;
}

.eyebrow {
	text-transform: uppercase;
	letter-spacing: 0.2em;
	font-size: 0.75rem;
	color: var(--accent-2);
	margin: 0 0 0.4rem;
}

.hero h1 {
	font-size: clamp(2.6rem, 4vw, 3.4rem);
	margin: 0 0 0.4rem;
}

.hero-subtitle {
	margin: 0 0 0.5rem;
	color: var(--text-muted);
	line-height: 1.6;
}

.hero-focus {
	margin: 0;
	font-size: 0.95rem;
	color: var(--accent);
}

.hero-actions {
	display: flex;
	flex-direction: row;
	flex-wrap: wrap;
	gap: 0.75rem;
	/* More breathing room beneath the Core-Loop tagline. */
	margin-top: 1.75rem;
}

/* Buttons */

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.7rem 1.4rem;
	font-size: 0.9rem;
	text-decoration: none;
	border: 2px solid var(--accent);
	text-transform: uppercase;
	letter-spacing: 0.16em;
	font-weight: 600;
	cursor: pointer;
	border-radius: var(--radius-pixel);
	box-shadow: var(--shadow-pixel);
}

/* PRIMARY BUTTON SWAP (BG ↔ TEXT) */
.btn.primary {
	background: var(--accent);
	color: var(--text-on-accent);
	border-color: var(--accent);
	transition: all 180ms ease;
}

.btn.primary:hover {
	background: var(--accent-2);
	color: var(--text-on-accent);
	border-color: var(--accent-2);
	transform: translateY(-1px);
	box-shadow: var(--shadow-pixel);
}

/* GHOST BUTTON SWAP (BG ↔ TEXT) */
.btn.ghost {
	background: transparent;
	color: var(--accent);
	border-color: var(--accent);
	transition: all 180ms ease;
}

/* Ghost mirrors primary's hover state — both end up cyan-filled with a
 * pixel-shadow lift, giving a consistent feel across the two buttons. */
.btn.ghost:hover {
	background: var(--accent-2);
	color: var(--text-on-accent);
	border-color: var(--accent-2);
	transform: translateY(-1px);
	box-shadow: var(--shadow-pixel);
}

.btn:active {
	animation: click-pulse 180ms ease-out;
}

/* Pixel card around radar */

.card {
	background: var(--bg-elevated);
	border-radius: var(--radius-pixel);
	border: 2px solid var(--border-strong);
	padding: clamp(0.5rem, 1.25vw, 0.85rem);
	color: var(--text-main);
}

.skills-card-wrap {
	display: flex;
	justify-content: center;
	min-width: 0;
}

.pixel-card {
	width: 100%;
	max-width: 320px;
	box-shadow: var(--shadow-pixel);
	position: relative;
}

.card-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 0.4rem;
}

.card-title {
	font-size: 0.9rem;
	text-transform: uppercase;
	letter-spacing: 0.16em;
	color: var(--text-muted);
	margin: 0;
	font-weight: 600;
}

.toggle-row {
	display: flex;
	gap: 0.5rem;
	margin-bottom: 0.4rem;
}

.toggle-button {
	flex: 1;
	min-height: 44px;
	/* WCAG AA touch target */
	padding: 0.65rem 1rem;
	font-size: 0.85rem;
	text-transform: uppercase;
	letter-spacing: 0.12em;
	border-radius: var(--radius-pixel);
	border: 1px solid rgba(148, 163, 184, 0.6);
	background: transparent;
	color: var(--text-muted);
	cursor: pointer;
	transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
}

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

.toggle-button.active {
	border-color: var(--accent);
	background: var(--accent-soft);
	color: var(--accent);
}

.chart-wrapper {
	position: relative;
	margin: 0 auto;
	width: 100%;
	max-width: 280px;
	aspect-ratio: 1 / 1;
	/* fluid square — scales with viewport */
}

.legend {
	display: grid;
	grid-template-columns: auto 1fr auto 1fr;
	align-items: center;
	gap: 0.25rem 0.5rem;
	font-size: 0.75rem;
	color: var(--text-muted);
	margin-top: 0.4rem;
}

.legend-item {
	width: 12px;
	height: 12px;
	border-radius: 999px;
	display: inline-block;
}

/* Theme-driven so the swatches track the accent overrides in light mode. */
.legend-item.current {
	background: var(--accent);
}

.legend-item.target {
	background: var(--accent-2);
}

/* Page header (sub-pages) */

.page-header {
	max-width: 1280px;
	margin: 0 auto;
	padding: clamp(1.5rem, 3vw + 0.5rem, 2.5rem) clamp(1rem, 2vw, 1.5rem) clamp(0.5rem, 1.5vw, 1rem);
}

.page-header .eyebrow {
	margin: 0 0 0.4rem;
}

.page-header .eyebrow a {
	color: var(--accent-2);
	text-decoration: none;
}

.page-header .eyebrow a:hover {
	text-decoration: underline;
}

.page-header h1 {
	font-size: clamp(2rem, 3vw + 0.5rem, 2.8rem);
	margin: 0;
}

/* Qualifications page — list + radar two-column */

.quals-layout {
	display: grid;
	grid-template-columns: 2fr 1fr;
	gap: clamp(1.5rem, 3vw, 2.5rem);
	align-items: start;
}

.quals-list {
	list-style: none;
	padding: 0;
	margin: 0.5rem 0;
	color: var(--text-muted);
}

.quals-list li {
	padding: 0.5rem 0;
	border-bottom: 1px solid rgba(148, 163, 184, 0.15);
	line-height: 1.55;
}

.quals-list li:last-child {
	border-bottom: none;
}

.quals-list strong {
	color: var(--text-main);
}

/* Sections */

.section {
	padding: clamp(0.75rem, 1.5vw + 0.25rem, 1.25rem) clamp(1rem, 2vw, 1.5rem);
	max-width: 1280px;
	margin: 0 auto;
}

.section h2 {
	font-size: clamp(1.4rem, 1.6vw + 0.9rem, 1.9rem);
	margin: 0 0 0.5rem;
	letter-spacing: -0.01em;
}

.section p {
	color: var(--text-muted);
	line-height: 1.6;
	margin: 0.5rem 0;
}

.section p:first-child,
.section>p:first-of-type {
	margin-top: 0;
}

/* Hover card grid (3x2) */

.cards-matrix {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1rem;
	margin-top: 0.75rem;
}

.hover-card {
	display: block;
	position: relative;
	border-radius: 10px;
	height: 240px;
	cursor: pointer;
	overflow: hidden;
	text-decoration: none;
	color: inherit;
}

.hover-card:focus-visible {
	outline: 2px solid var(--accent-2);
	outline-offset: 4px;
}

.hover-card::before,
.hover-card::after {
	border-radius: inherit;
	content: "";
	height: 100%;
	left: 0;
	opacity: 0;
	position: absolute;
	top: 0;
	transition: opacity 300ms ease;
	width: 100%;
}

.cards-matrix:hover>.hover-card::after {
	opacity: 1;
}

/* Brighter, more noticeable glow */
.hover-card::before {
	background: radial-gradient(700px circle at var(--mouse-x) var(--mouse-y),
			rgba(255, 255, 255, 0.35),
			transparent 50%);
	z-index: 3;
}

.hover-card::after {
	background: radial-gradient(520px circle at var(--mouse-x) var(--mouse-y),
			rgba(56, 189, 248, 0.99),
			transparent 50%);
	z-index: 1;
}

.hover-card-content {
	background-color: rgba(15, 23, 42, 0.8);
	border-radius: inherit;
	display: flex;
	flex-direction: column;
	flex-grow: 1;
	inset: 1px;
	padding: 12px;
	position: absolute;
	z-index: 2;
	border: 1px solid rgba(148, 163, 184, 0.3);
}

:root[data-theme="light"] .hover-card-content {
	background-color: rgba(255, 255, 255, 0.96);
}

/* Hover card inner content */

.hover-card-image {
	align-items: center;
	display: flex;
	height: 120px;
	justify-content: center;
	overflow: hidden;
}

.hover-card-icon {
	font-size: 3rem;
	opacity: 0.7;
}

.hover-card-info-wrapper {
	align-items: center;
	display: flex;
	flex-grow: 1;
	justify-content: flex-start;
	padding: 0 12px;
}

.hover-card-info {
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.hover-card-info-title h3 {
	font-size: 1.05rem;
	margin: 0;
	color: var(--text-main);
}

.hover-card-info-title h4 {
	margin: 0.25rem 0 0;
	font-size: 0.85rem;
	color: var(--text-muted);
}

/* Contact */

.contact-list {
	list-style: none;
	padding: 0;
	margin: 0.5rem 0 0;
}

/* Inline icon row */
.contact-icons {
	display: flex;
	gap: 0.9rem;
	align-items: center;
	flex-wrap: wrap;
	/* keep icons tidy on narrow screens */
}

.contact-icon-link {
	/* 44px — WCAG touch-target minimum */
	width: 2.75rem;
	height: 2.75rem;
	border-radius: 999px;
	border: 1px solid rgba(148, 163, 184, 0.4);
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-size: 1.4rem;
	color: var(--accent);
	text-decoration: none;
	transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease,
		transform 120ms ease;
}

.contact-icon-link:hover {
	color: var(--accent-2);
	background: var(--accent-soft);
	box-shadow: 0 0 14px rgba(56, 189, 248, 0.6);
	transform: translateY(-1px);
}

/* Old label styles kept for safety if reused elsewhere */
.contact-label {
	display: inline-block;
	min-width: 70px;
	color: var(--text-muted);
}

.contact-icon-link:active {
	animation: click-pulse 180ms ease-out;
}

/* Footer */

.site-footer {
	margin-top: auto;
	padding: 1.5rem 5vw 2rem;
	font-size: 0.8rem;
	color: var(--text-muted);
	display: flex;
	justify-content: space-between;
	gap: 1rem;
	border-top: 1px solid rgba(148, 163, 184, 0.15);
}

.footer-dot {
	opacity: 0.8;
}

/* Responsive */

@media (max-width: 900px) {
	.hero {
		padding-top: 2.5rem;
	}

	.quals-layout {
		grid-template-columns: 1fr;
	}

	.cards-matrix {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 768px) {
	.header-controls {
		gap: 0.75rem;
	}

	.menu-toggle {
		display: inline-flex;
	}

	/* Mobile dropdown: right-aligned, not full-width, with transition */
	.main-nav {
		position: absolute;
		top: 100%;
		right: 5vw;
		left: auto;
		padding: 0.5rem 0.9rem 0.7rem;
		background: var(--bg-elevated);
		border: 1px solid rgba(148, 163, 184, 0.35);
		border-radius: 0.75rem;
		flex-direction: column;
		gap: 0.5rem;
		box-shadow: 0 12px 25px rgba(15, 23, 42, 0.5);
		max-height: 0;
		opacity: 0;
		overflow: hidden;
		pointer-events: none;
		transform-origin: top right;
		transform: scaleY(0.9);
		transition: opacity 180ms ease, transform 180ms ease, max-height 180ms ease;

		/* prevent links from stretching full width */
		align-items: flex-start;
	}

	:root[data-theme="light"] .main-nav {
		box-shadow: 0 10px 24px rgba(15, 23, 42, 0.18);
	}

	.main-nav.open {
		max-height: 260px;
		opacity: 1;
		pointer-events: auto;
		transform: scaleY(1);
	}

	.main-nav a {
		padding-bottom: 0.25rem;
	}
}

@media (max-width: 600px) {
	.site-header {
		flex-direction: row;
	}

	.logo {
		font-size: 0.9rem;
	}

	.hero {
		padding-top: 2rem;
	}

	.pixel-card {
		width: 100%;
	}

	.cards-matrix {
		grid-template-columns: 1fr;
	}

	.hover-card {
		height: 210px;
	}

	.contact-icons {
		gap: 0.75rem;
	}
}

/* Motion reduction for accessibility / future-proofing */
@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
		scroll-behavior: auto !important;
	}
}

@keyframes click-pulse {
	0% {
		transform: scale(1);
		box-shadow: var(--shadow-pixel);
	}

	50% {
		transform: scale(0.98);
		box-shadow: 0 0 5px var(--accent);
	}

	100% {
		transform: scale(1);
		box-shadow: var(--shadow-pixel);
	}
}

/* ============================================================
 * Roadmap page — vertical zigzag certification path.
 * Reuses --accent / --accent-2 / --shadow-pixel / --accent-soft
 * for theme + motion consistency with the rest of the site.
 * ============================================================ */

.roadmap-intro {
	max-width: 60ch;
	margin: 0 0 1rem;
	color: var(--text-muted);
	line-height: 1.55;
}

.roadmap-track-section {
	padding-top: clamp(0.5rem, 1.5vw, 1rem);
	padding-bottom: clamp(0.5rem, 1.5vw, 1rem);
}

.roadmap-track {
	list-style: none;
	margin: 0 auto;
	padding: 0;
	max-width: 880px;
	position: relative;
}

.roadmap-node {
	display: grid;
	grid-template-columns: 1fr auto 1fr;
	column-gap: clamp(1rem, 2vw + 0.25rem, 1.75rem);
	align-items: center;
	position: relative;
	padding-block: clamp(1rem, 2vw, 1.5rem);
}

/* Vertical rail connecting this node down to the next.
 * Status drives colour: achieved = solid accent (path built),
 * in-progress = gradient (work flowing), planned = dashed muted. */
.roadmap-node:not(:last-child)::after {
	content: "";
	position: absolute;
	left: 50%;
	top: calc(50% + 1.6rem);
	bottom: 0;
	width: 3px;
	transform: translateX(-50%);
	background: var(--border-strong);
	z-index: 0;
}

.roadmap-node[data-status="achieved"]:not(:last-child)::after {
	background: var(--accent);
}

.roadmap-node[data-status="in-progress"]:not(:last-child)::after {
	background: linear-gradient(to bottom, var(--accent), var(--border-strong));
}

.roadmap-node[data-status="planned"]:not(:last-child)::after {
	background: repeating-linear-gradient(to bottom,
			var(--border-strong) 0,
			var(--border-strong) 6px,
			transparent 6px,
			transparent 12px);
}

/* Zigzag layout — odd nodes left, even nodes right. */
.roadmap-node:nth-child(odd) .node-card-wrap {
	grid-column: 1;
	justify-self: end;
}

.roadmap-node:nth-child(odd) .node-marker {
	grid-column: 2;
}

.roadmap-node:nth-child(even) .node-card-wrap {
	grid-column: 3;
	justify-self: start;
}

.roadmap-node:nth-child(even) .node-marker {
	grid-column: 2;
}

/* Node card wrapper — anchors the popup positioning. */
.node-card-wrap {
	position: relative;
	max-width: 360px;
	width: 100%;
}

/* Node card — frameless. No background, border, or shadow: the row reads as
 * text + icon, with the wipe-in underline ported from .main-nav a::after
 * (200ms ease-out) as the only hover affordance. */
.node-card {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	width: 100%;
	text-align: left;
	background: none;
	border: none;
	color: var(--text-main);
	padding: 0.85rem 1rem;
	cursor: pointer;
	font: inherit;
	position: relative;
	/* anchors the ::after underline */
}

/* Wipe-in underline — mirrors .main-nav a::after but the origin is set per
 * zigzag side below so the bar starts at the text-reading edge. */
.node-card::after {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 2px;
	background-color: var(--accent);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 200ms ease-out;
	pointer-events: none;
}

.node-card:hover::after,
.node-card:focus-visible::after {
	transform: scaleX(1);
}

.node-card:focus-visible {
	outline: 2px solid var(--accent-2);
	outline-offset: 4px;
}

/* Odd cards sit on the left of the zigzag with right-aligned text — icon goes
 * on the outer (left) edge and the underline wipes from the right so it
 * starts where the text starts. */
.roadmap-node:nth-child(odd) .node-card {
	text-align: right;
}

.roadmap-node:nth-child(odd) .node-card::after {
	transform-origin: right;
}

/* Even cards sit on the right of the zigzag with left-aligned text — flex is
 * reversed so the icon lands on the outer (right) edge. */
.roadmap-node:nth-child(even) .node-card {
	flex-direction: row-reverse;
}

/* Qualification icon inside the card — colour-uniform (--accent-2). Status is
 * conveyed by the rail marker and the underline colour, not this icon. */
.node-icon {
	font-size: 1.75rem;
	color: var(--accent-2);
	flex-shrink: 0;
	line-height: 1;
}

.node-text {
	flex: 1;
	min-width: 0;
}

.node-title {
	margin: 0 0 0.2rem;
	font-size: 1rem;
	color: var(--text-main);
	line-height: 1.3;
}

.node-meta {
	margin: 0;
	font-size: 0.82rem;
	color: var(--text-muted);
	line-height: 1.4;
}

/* Status accents on the underline — green (--accent) for achieved goals (the
 * default), blue (--accent-2) for everything still to be earned. The rail
 * marker continues to carry the at-a-glance status cue (check / bolt / circle
 * / star) since the card itself is now frameless. */
.roadmap-node[data-status="in-progress"] .node-card::after,
.roadmap-node[data-status="planned"] .node-card::after {
	background-color: var(--accent-2);
}

/* Marker — circular badge sitting on the rail. */
.node-marker {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 2.4rem;
	height: 2.4rem;
	border-radius: 50%;
	border: 2px solid var(--border-strong);
	background: var(--bg-elevated);
	color: var(--text-muted);
	font-size: 0.95rem;
	z-index: 1;
	box-shadow: var(--shadow-pixel);
	transition: transform 180ms ease, box-shadow 180ms ease;
}

.roadmap-node[data-status="achieved"] .node-marker {
	background: var(--accent);
	border-color: var(--accent);
	color: var(--text-on-accent);
}

.roadmap-node[data-status="in-progress"] .node-marker {
	border-color: var(--accent-2);
	color: var(--accent-2);
	background: var(--bg-elevated);
	animation: node-pulse 2.2s ease-in-out infinite;
}

.roadmap-node[data-status="planned"] .node-marker {
	border-color: var(--border-strong);
	color: var(--text-muted);
	border-style: dashed;
}

/* Popup — visible on hover (desktop), keyboard focus, or aria-expanded (tap). */
.node-popup {
	position: absolute;
	top: calc(100% + 0.5rem);
	right: 0;
	width: max-content;
	max-width: min(320px, 80vw);
	background: var(--bg-elevated);
	border: 2px solid var(--accent-2);
	box-shadow: var(--shadow-pixel);
	padding: 0.75rem 0.9rem;
	z-index: 5;
	opacity: 0;
	pointer-events: none;
	transform: translateY(-4px);
	transition: opacity 180ms ease, transform 180ms ease;
}

.roadmap-node:nth-child(even) .node-popup {
	left: 0;
	right: auto;
}

.node-card:hover ~ .node-popup,
.node-card:focus-visible ~ .node-popup,
.node-card[aria-expanded="true"] ~ .node-popup {
	opacity: 1;
	transform: translateY(0);
	pointer-events: auto;
}

.popup-title {
	margin: 0 0 0.35rem;
	font-size: 0.7rem;
	text-transform: uppercase;
	letter-spacing: 0.18em;
	color: var(--accent-2);
}

.popup-list {
	margin: 0;
	padding: 0 0 0 1.1rem;
	color: var(--text-muted);
	font-size: 0.85rem;
	line-height: 1.5;
}

.popup-list li {
	padding: 0.1rem 0;
}

/* Endpoint — distinct diamond marker, no popup. */
.roadmap-endpoint {
	margin-top: 0.5rem;
}

.roadmap-endpoint .endpoint-content {
	grid-column: 1;
	justify-self: end;
	text-align: right;
}

.roadmap-endpoint:nth-child(even) .endpoint-content {
	grid-column: 3;
	justify-self: start;
	text-align: left;
}

.endpoint-title {
	margin: 0;
	font-size: 1.05rem;
	color: var(--accent-2);
	letter-spacing: 0.04em;
	text-transform: uppercase;
}

.endpoint-date {
	margin: 0.15rem 0 0;
	font-size: 0.85rem;
	color: var(--text-muted);
}

.endpoint-marker {
	width: 2.6rem;
	height: 2.6rem;
	border-radius: 0;
	transform: rotate(45deg);
	background: var(--accent-2);
	border-color: var(--accent-2);
	color: var(--text-on-accent);
}

.endpoint-marker > i {
	transform: rotate(-45deg);
}

/* In-progress glow pulse — only "progression-game" flair on this page,
 * layered on top of the site's restrained motion language. */
@keyframes node-pulse {

	0%,
	100% {
		box-shadow: var(--shadow-pixel), 0 0 0 0 var(--accent-soft);
	}

	50% {
		box-shadow: var(--shadow-pixel), 0 0 0 8px transparent;
	}
}

/* ============================================================
 * Blog — posts embedded on the Write-ups & Blog page. Mono
 * date-line echoes the site's eyebrow idiom; body copy stays
 * sans with a capped measure for comfortable long-form reading.
 * ============================================================ */

.blog-post {
	margin: 2.25rem 0 0;
	padding-top: 2.25rem;
	border-top: 1px solid var(--border-strong);
}

.post-meta {
	font-family: var(--font-mono);
	font-size: 0.72rem;
	text-transform: uppercase;
	letter-spacing: 0.16em;
	color: var(--accent-2);
	margin: 0 0 0.35rem;
}

.blog-post h3 {
	margin: 0 0 0.5rem;
	font-size: 1.2rem;
	line-height: 1.35;
}

.blog-post p {
	max-width: 70ch;
	line-height: 1.65;
}

.blog-post code {
	font-size: 0.9em;
	background: var(--bg);
	padding: 0.05rem 0.32rem;
	border: 1px solid var(--border-strong);
	color: var(--accent);
}

/* ============================================================
 * Revision sheet — port and command reference tables, plus
 * single-answer recall questions. Matches site theme variables.
 * ============================================================ */

.rev-intro {
	max-width: 70ch;
	color: var(--text-muted);
	line-height: 1.6;
	margin: 0 0 1rem;
}

.rev-toc {
	list-style: none;
	padding: 0;
	margin: 1rem 0 1.5rem;
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: 0.5rem;
}

.rev-toc a {
	display: block;
	padding: 0.55rem 0.8rem;
	border: 1px solid var(--border-strong);
	background: var(--bg-elevated);
	color: var(--text-main);
	text-decoration: none;
	font-size: 0.85rem;
	letter-spacing: 0.02em;
	transition: border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.rev-toc a:hover,
.rev-toc a:focus-visible {
	border-color: var(--accent);
	background: var(--accent-soft);
	color: var(--accent);
	outline: none;
}

.rev-method {
	border: 1px solid var(--border-strong);
	background: var(--bg-elevated);
	padding: 0.85rem 1rem;
	margin: 1rem 0 1.5rem;
}

.rev-method h3 {
	margin: 0 0 0.5rem;
	font-size: 0.95rem;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	color: var(--accent-2);
}

.rev-method ul {
	margin: 0.25rem 0 0;
	padding-left: 1.2rem;
	color: var(--text-muted);
	line-height: 1.55;
	font-size: 0.88rem;
}

.rev-method ul li {
	padding: 0.15rem 0;
}

.rev-method strong {
	color: var(--text-main);
}

.rev-table-wrap {
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
	margin: 1rem 0 1.25rem;
	border: 1px solid var(--border-strong);
}

.rev-table {
	width: 100%;
	border-collapse: collapse;
	font-size: 0.85rem;
	min-width: 720px;
	/* Fixed layout means column widths come from the rules below, not the
	 * widest cell content — without this, the long protocol names in the
	 * Port and Service columns would dominate the row. */
	table-layout: fixed;
}

/* Narrow # column; remaining columns share the rest equally.
 * 4em ≈ 64px which, after the 0.55rem inner padding (border-box), leaves
 * ~46px of content area — comfortably fits two-digit ports (1–50) and the
 * three-character L88 / W90 entries in the command tables. nowrap is the
 * belt-and-braces backstop. */
.rev-table th:first-child,
.rev-table td:first-child {
	width: 4em;
	white-space: nowrap;
}

.rev-table thead th {
	background: var(--bg-elevated);
	border-bottom: 2px solid var(--accent);
	text-align: left;
	padding: 0.6rem 0.55rem;
	font-size: 0.72rem;
	text-transform: uppercase;
	letter-spacing: 0.08em;
	color: var(--accent-2);
}

.rev-table tbody td {
	border-bottom: 1px solid rgba(148, 163, 184, 0.15);
	padding: 0.55rem;
	vertical-align: top;
	line-height: 1.45;
	color: var(--text-main);
	overflow-wrap: anywhere;
}

.rev-table tbody tr:nth-child(even) td {
	background: rgba(148, 163, 184, 0.04);
}

.rev-table tbody tr:hover td {
	background: var(--accent-soft);
}

.rev-table code {
	font-family: var(--font-mono);
	font-size: 0.85em;
	background: var(--bg);
	padding: 0.05rem 0.32rem;
	border: 1px solid var(--border-strong);
	color: var(--accent);
	/* Allow long code tokens to break inside narrower fixed columns. */
	overflow-wrap: anywhere;
	word-break: break-word;
}

.rev-table .num {
	font-variant-numeric: tabular-nums;
	font-weight: 600;
	color: var(--accent);
}

.rev-table .svc {
	font-weight: 600;
	color: var(--text-main);
}

.rev-table .hook {
	color: var(--text-muted);
	font-style: italic;
}

.rev-q-list {
	list-style: none;
	padding: 0;
	margin: 1rem 0 0;
	display: grid;
	gap: 0.6rem;
}

.rev-q {
	padding: 0.75rem 0.95rem;
	border-left: 3px solid var(--accent-2);
	background: var(--bg-elevated);
	border-top: 1px solid var(--border-strong);
	border-right: 1px solid var(--border-strong);
	border-bottom: 1px solid var(--border-strong);
}

.rev-q .q-num {
	margin: 0 0 0.25rem;
	font-size: 0.7rem;
	text-transform: uppercase;
	letter-spacing: 0.16em;
	color: var(--accent-2);
	font-weight: 600;
}

.rev-q .q-prompt {
	margin: 0.15rem 0 0.4rem;
	color: var(--text-main);
	line-height: 1.55;
}

.rev-q .q-options {
	margin: 0.25rem 0 0.4rem 0;
	padding: 0 0 0 1.5rem;
	color: var(--text-muted);
	line-height: 1.5;
}

.rev-q .q-options li {
	padding: 0.1rem 0;
}

.rev-q .q-answer {
	margin: 0.3rem 0 0;
	font-size: 0.85rem;
	color: var(--accent);
}

.rev-q .q-answer strong {
	color: var(--accent);
}

.rev-section-title {
	display: flex;
	flex-wrap: wrap;
	align-items: baseline;
	gap: 0.6rem;
	margin: 1.5rem 0 0.5rem;
}

.rev-section-title h2 {
	margin: 0;
}

.rev-section-title .rev-tag {
	font-size: 0.72rem;
	text-transform: uppercase;
	letter-spacing: 0.16em;
	color: var(--accent-2);
	border: 1px solid var(--accent-2);
	padding: 0.15rem 0.5rem;
}

@media (max-width: 600px) {
	.rev-table {
		font-size: 0.8rem;
		min-width: 600px;
	}

	.rev-q .q-options {
		padding-left: 1.2rem;
	}
}

/* Mobile — collapse zigzag to single column with marker rail on left.
 * Popup expands inline below the card when tap-toggled. */
@media (max-width: 700px) {
	.roadmap-track {
		max-width: 100%;
	}

	.roadmap-node,
	.roadmap-node:nth-child(odd),
	.roadmap-node:nth-child(even) {
		grid-template-columns: 2.6rem 1fr;
		column-gap: 1rem;
	}

	.roadmap-node .node-marker,
	.roadmap-node:nth-child(odd) .node-marker,
	.roadmap-node:nth-child(even) .node-marker {
		grid-column: 1;
		justify-self: center;
	}

	.roadmap-node .node-card-wrap,
	.roadmap-node:nth-child(odd) .node-card-wrap,
	.roadmap-node:nth-child(even) .node-card-wrap {
		grid-column: 2;
		justify-self: stretch;
		max-width: 100%;
	}

	.roadmap-node .node-card,
	.roadmap-node:nth-child(odd) .node-card,
	.roadmap-node:nth-child(even) .node-card {
		text-align: left;
		flex-direction: row;
	}

	/* All cards left-align at this breakpoint, so the underline wipes from the
	 * left regardless of zigzag parity in the desktop layout. */
	.roadmap-node:nth-child(odd) .node-card::after {
		transform-origin: left;
	}

	.roadmap-node:not(:last-child)::after {
		left: 1.3rem;
	}

	.node-popup,
	.roadmap-node:nth-child(even) .node-popup {
		position: static;
		width: 100%;
		max-width: 100%;
		margin-top: 0.5rem;
		transform: none;
		display: none;
	}

	.node-card[aria-expanded="true"] ~ .node-popup {
		display: block;
		opacity: 1;
		transform: none;
		pointer-events: auto;
	}

	.roadmap-endpoint .endpoint-content,
	.roadmap-endpoint:nth-child(even) .endpoint-content {
		grid-column: 2;
		justify-self: start;
		text-align: left;
	}
}