/* =========================================================
   John Ozoemena — Portfolio
   Design concept: technical spec sheet / blueprint document
   ========================================================= */

:root {
	/* Color */
	--paper: #ffffff;
	--paper-alt: #f3f5f4;
	--ink: #10161c;
	--ink-soft: #4a5560;
	--ink-faint: #7c8892;
	--blueprint: #24507a;
	--blueprint-dark: #17324f;
	--signal: #1e8e5a;
	--signal-dark: #146b43;
	--line: #dde3e1;
	--line-strong: #c3ccc9;

	/* Type */
	--font-display: 'Instrument Serif', Georgia, serif;
	--font-body:
		'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

	/* Scale */
	--measure: 68ch;
	--space-1: 0.5rem;
	--space-2: 1rem;
	--space-3: 1.75rem;
	--space-4: 3rem;
	--space-5: 5rem;
	--space-6: 8rem;

	--radius: 3px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
	box-sizing: border-box;
}
html {
	-webkit-text-size-adjust: 100%;
}
body {
	margin: 0;
	background: var(--paper);
	color: var(--ink);
	font-family: var(--font-body);
	font-size: 16px;
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
}
img {
	max-width: 100%;
	display: block;
}
ul,
ol {
	padding: 0;
	margin: 0;
	list-style: none;
}
a {
	color: inherit;
	text-decoration: none;
}
h1,
h2,
h3,
h4,
p,
dl,
dd {
	margin: 0;
}
button {
	font: inherit;
	color: inherit;
	background: none;
	border: 0;
	cursor: pointer;
}
input,
textarea {
	font: inherit;
	color: inherit;
}

/* Visible keyboard focus everywhere */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
	outline: 2px solid var(--blueprint);
	outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
	*,
	*::before,
	*::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
		scroll-behavior: auto !important;
	}
}

/* ---------- Scroll reveal ----------
 * Applied only once JS confirms it can run the IntersectionObserver
 * (html.js), so content is fully visible by default for no-JS visitors
 * and stays fully visible if the browser respects reduced motion.
 */
.js .reveal {
	opacity: 0;
	transform: translateY(18px);
	transition:
		opacity 0.6s ease,
		transform 0.6s ease;
	transition-delay: var(--reveal-delay, 0s);
}
.js .reveal.is-visible {
	opacity: 1;
	transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
	.js .reveal {
		opacity: 1 !important;
		transform: none !important;
		transition: none !important;
	}
}

/* Staggered reveal timing for repeated items, done with nth-child so no
   inline style attributes are needed on individual elements. */
.stagger > .reveal:nth-child(1) {
	transition-delay: 0s;
}
.stagger > .reveal:nth-child(2) {
	transition-delay: 0.08s;
}
.stagger > .reveal:nth-child(3) {
	transition-delay: 0.16s;
}
.stagger > .reveal:nth-child(4) {
	transition-delay: 0.24s;
}
.stagger > .reveal:nth-child(5) {
	transition-delay: 0.32s;
}
.stagger > .reveal:nth-child(6) {
	transition-delay: 0.4s;
}
.stagger > .reveal:nth-child(7) {
	transition-delay: 0.48s;
}
.stagger > .reveal:nth-child(8) {
	transition-delay: 0.56s;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.skip-link {
	position: absolute;
	left: -9999px;
	top: 0;
	background: var(--ink);
	color: var(--paper);
	padding: var(--space-1) var(--space-2);
	z-index: 100;
}
.skip-link:focus {
	left: var(--space-2);
	top: var(--space-2);
}

/* ---------- Layout helpers ---------- */
.wrap {
	max-width: 1080px;
	margin: 0 auto;
	padding-left: var(--space-3);
	padding-right: var(--space-3);
}

.measure {
	max-width: var(--measure);
}

section {
	border-top: 1px solid var(--line);
}
section.hero {
	border-top: none;
}

.section-head {
	display: flex;
	gap: var(--space-2);
	align-items: baseline;
	margin-bottom: var(--space-4);
}
.section-no {
	font-family: var(--font-mono);
	font-size: 0.8rem;
	color: var(--blueprint);
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: 0.15rem 0.5rem;
	flex-shrink: 0;
}
.section-head h2 {
	font-family: var(--font-display);
	font-size: clamp(1.75rem, 3vw, 2.25rem);
	font-weight: 400;
}

/* ---------- Header ---------- */
.site-header {
	border-bottom: 1px solid var(--line);
	position: sticky;
	top: 0;
	background: rgba(255, 255, 255, 0.92);
	backdrop-filter: blur(6px);
	z-index: 50;
}
.header-row {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding-top: var(--space-2);
	padding-bottom: var(--space-2);
}
.brand {
	font-family: var(--font-display);
	font-size: 1.35rem;
}
.site-nav {
	display: flex;
	align-items: center;
	gap: var(--space-3);
	font-size: 0.95rem;
}
.site-nav a {
	color: var(--ink-soft);
	padding: 0.25rem 0.1rem;
	border-bottom: 1px solid transparent;
}
.site-nav a:hover {
	color: var(--ink);
	border-bottom-color: var(--blueprint);
}
.site-nav .cv-link {
	font-family: var(--font-mono);
	font-size: 0.82rem;
	color: var(--blueprint);
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: 0.4rem 0.7rem;
}
.site-nav .cv-link:hover {
	border-color: var(--blueprint);
}

.nav-toggle {
	display: none;
	flex-direction: column;
	gap: 5px;
	padding: 0.4rem;
}
.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
	content: '';
	display: block;
	width: 22px;
	height: 2px;
	background: var(--ink);
}
.nav-toggle-bar::before {
	transform: translateY(-6px);
}
.nav-toggle-bar::after {
	transform: translateY(4px);
}

@media (max-width: 720px) {
	.nav-toggle {
		display: flex;
	}
	.site-nav {
		position: absolute;
		top: 100%;
		left: 0;
		right: 0;
		background: var(--paper);
		border-bottom: 1px solid var(--line);
		flex-direction: column;
		align-items: flex-start;
		padding: var(--space-2) var(--space-3) var(--space-3);
		display: none;
	}
	.site-nav.is-open {
		display: flex;
	}
	.site-nav .cv-link {
		margin-top: var(--space-1);
	}
}

/* ---------- Hero ---------- */
.hero {
	position: relative;
	padding: var(--space-6) 0 var(--space-5);
	overflow: hidden;
}
.hero::before {
	content: '';
	position: absolute;
	top: -20%;
	right: -12%;
	width: 46vw;
	height: 46vw;
	max-width: 620px;
	max-height: 620px;
	background: radial-gradient(
		circle,
		rgba(36, 80, 122, 0.14) 0%,
		rgba(36, 80, 122, 0) 70%
	);
	pointer-events: none;
}
.hero-grid {
	position: relative;
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
	gap: var(--space-5);
	align-items: start;
}
.hero-content {
	max-width: 760px;
}
.hero .section-no {
	margin-bottom: var(--space-3);
	display: inline-block;
	background: var(--paper);
}
.hero h1 {
	font-family: var(--font-display);
	font-weight: 400;
	font-size: clamp(2.25rem, 5vw, 3.4rem);
	line-height: 1.15;
	letter-spacing: -0.01em;
}
.hero-lede {
	margin-top: var(--space-3);
	font-size: 1.15rem;
	color: var(--ink-soft);
	max-width: 56ch;
}
.hero-actions {
	display: flex;
	gap: var(--space-2);
	margin-top: var(--space-4);
	flex-wrap: wrap;
}
.btn {
	display: inline-block;
	font-size: 0.95rem;
	padding: 0.75rem 1.3rem;
	border-radius: var(--radius);
	border: 1px solid transparent;
}
.btn-primary {
	background: var(--signal);
	color: #fff;
}
.btn-primary:hover {
	background: var(--signal-dark);
}
.btn-ghost {
	border-color: var(--line-strong);
	color: var(--ink);
}
.btn-ghost:hover {
	border-color: var(--ink);
}

/* ---------- Portrait frames (clip-path, aspect-ratio based = scales cleanly) ---------- */
.portrait {
	position: relative;
	aspect-ratio: 3 / 4;
	width: 100%;
}
.portrait::before {
	/* Offset outline echoing the clip shape, like a drafting registration mark. */
	content: '';
	position: absolute;
	inset: 14px -14px -14px 14px;
	border: 1px solid var(--blueprint);
	opacity: 0.35;
	z-index: 0;
}
.portrait img {
	position: relative;
	z-index: 1;
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	background: var(--paper-alt);
}

.portrait--hero,
.portrait--hero::before,
.portrait--hero img {
	clip-path: polygon(0 6%, 94% 0, 100% 94%, 6% 100%);
}

.portrait--about,
.portrait--about::before,
.portrait--about img {
	clip-path: polygon(6% 0, 100% 0, 100% 92%, 94% 100%, 0 100%, 0 8%);
}

.portrait--contact,
.portrait--contact::before,
.portrait--contact img {
	clip-path: polygon(0 0, 100% 0, 100% 88%, 88% 100%, 0 100%);
}

.hero-portrait {
	align-self: center;
}

@media (max-width: 820px) {
	.hero-grid {
		grid-template-columns: 1fr;
		gap: var(--space-3);
	}
	.hero-portrait {
		max-width: 260px;
		margin: 0 auto;
		order: -1;
	}
}

.hero-stats {
	display: flex;
	gap: var(--space-4);
	margin-top: var(--space-5);
	padding-top: var(--space-3);
	border-top: 1px solid var(--line);
	flex-wrap: wrap;
}
.hero-stats dt {
	font-size: 0.8rem;
	color: var(--ink-faint);
}
.hero-stats dd {
	font-family: var(--font-mono);
	font-size: 1.1rem;
	color: var(--ink);
	margin-top: 0.2rem;
}

/* ---------- About ---------- */
.about {
	position: relative;
	padding: var(--space-5) 0;
	background:
		linear-gradient(180deg, var(--paper-alt), var(--paper-alt)),
		repeating-linear-gradient(
			135deg,
			rgba(36, 80, 122, 0.05) 0 2px,
			transparent 2px 14px
		);
}
.about-grid {
	display: grid;
	grid-template-columns: minmax(160px, 220px) minmax(0, 1fr) minmax(0, 280px);
	gap: var(--space-5);
	align-items: start;
}
.about-portrait {
	align-self: start;
}
.about-copy p {
	color: var(--ink-soft);
	margin-bottom: var(--space-2);
}
.about-copy p:last-child {
	margin-bottom: 0;
}

.principles {
	display: grid;
	gap: var(--space-3);
	align-content: start;
}
.principles li {
	border-top: 1px solid var(--line);
	padding-top: var(--space-2);
}
.principles h3 {
	font-family: var(--font-mono);
	font-size: 0.95rem;
	color: var(--blueprint);
}
.principles p {
	color: var(--ink-soft);
	font-size: 0.92rem;
	margin-top: 0.35rem;
}

@media (max-width: 980px) {
	.about-grid {
		grid-template-columns: minmax(140px, 180px) minmax(0, 1fr);
	}
	.principles {
		grid-column: 1 / -1;
		grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
	}
}
@media (max-width: 820px) {
	.about-grid {
		grid-template-columns: 1fr;
		gap: var(--space-4);
	}
	.about-portrait {
		max-width: 220px;
	}
}

/* ---------- Stack ---------- */
.stack {
	padding: var(--space-5) 0;
}
.stack-groups {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
	gap: var(--space-4);
}
.stack-group h3 {
	font-size: 0.85rem;
	color: var(--ink-faint);
	text-transform: none;
	border-bottom: 1px solid var(--line);
	padding-bottom: var(--space-1);
	margin-bottom: var(--space-2);
}
.stack-group li {
	font-family: var(--font-mono);
	font-size: 0.92rem;
	color: var(--ink);
	padding: 0.3rem 0;
}

/* ---------- Projects (datasheet rows) ---------- */
.projects {
	padding: var(--space-5) 0 var(--space-6);
}
.project-log {
	display: flex;
	flex-direction: column;
}
.project-entry {
	display: grid;
	grid-template-columns: 260px minmax(0, 1fr);
	gap: var(--space-4);
	padding-block: var(--space-4);
	padding-inline-start: var(--space-2);
	border-top: 1px solid var(--line);
	transition: background-color 0.25s ease;
}
.project-entry:hover {
	background-color: var(--paper-alt);
}
.project-entry:last-child {
	border-bottom: 1px solid var(--line);
}

.project-meta h3 {
	font-family: var(--font-display);
	font-size: 1.5rem;
	font-weight: 400;
}
.project-role {
	font-size: 0.85rem;
	color: var(--ink-faint);
	margin-top: 0.3rem;
}
.project-status {
	display: inline-block;
	font-family: var(--font-mono);
	font-size: 0.72rem;
	color: var(--signal-dark);
	border: 1px solid var(--signal);
	border-radius: var(--radius);
	padding: 0.1rem 0.45rem;
	margin-top: 0.6rem;
}
.project-link {
	display: inline-block;
	margin-top: 0.9rem;
	font-size: 0.88rem;
	color: var(--blueprint);
	border-bottom: 1px solid var(--blueprint);
}
.project-link:hover {
	color: var(--blueprint-dark);
	border-color: var(--blueprint-dark);
}

.project-body p {
	color: var(--ink-soft);
	max-width: var(--measure);
}
.tech-tags {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem;
	margin-top: var(--space-2);
}
.tech-tags li {
	font-family: var(--font-mono);
	font-size: 0.78rem;
	color: var(--ink-soft);
	background: var(--paper-alt);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	padding: 0.2rem 0.55rem;
}

@media (max-width: 720px) {
	.project-entry {
		grid-template-columns: 1fr;
		gap: var(--space-2);
	}
}

/* ---------- CTA band ---------- */
.cta-band {
	position: relative;
	padding: var(--space-6) 0;
	background: var(--ink);
	color: var(--paper);
	border-top: none;
	overflow: hidden;
}
.cta-band::before {
	content: '';
	position: absolute;
	inset: 0;
	background: linear-gradient(
		135deg,
		rgba(30, 142, 90, 0.22) 0%,
		rgba(30, 142, 90, 0) 45%
	);
	clip-path: polygon(100% 0, 100% 100%, 40% 100%, 62% 0);
	pointer-events: none;
}
.cta-band .wrap {
	position: relative;
}
.cta-grid {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
	gap: var(--space-5);
	align-items: center;
}
.cta-band h2 {
	font-family: var(--font-display);
	font-weight: 400;
	font-size: clamp(1.75rem, 3.5vw, 2.5rem);
	max-width: 20ch;
}
.cta-band p {
	color: #b9c2c8;
	margin-top: var(--space-2);
	max-width: 50ch;
}
.cta-band .btn-primary {
	margin-top: var(--space-3);
}
.cta-portrait {
	justify-self: center;
}
.cta-portrait::before {
	opacity: 0.5;
}

@media (max-width: 680px) {
	.cta-grid {
		grid-template-columns: 1fr;
		gap: var(--space-3);
		text-align: left;
	}
	.cta-portrait {
		max-width: 180px;
		order: -1;
	}
}

/* ---------- Footer ---------- */
.site-footer {
	padding: var(--space-3) 0;
}
.footer-row {
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-wrap: wrap;
	gap: var(--space-2);
	font-size: 0.85rem;
	color: var(--ink-faint);
}
.social-links {
	display: flex;
	gap: var(--space-3);
}
.social-links a:hover {
	color: var(--ink);
}

/* ---------- Contact page ---------- */
.contact-section {
	padding: var(--space-6) 0;
}
.contact-grid {
	display: grid;
	grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
	gap: var(--space-5);
}
.contact-intro h1 {
	font-family: var(--font-display);
	font-weight: 400;
	font-size: clamp(2rem, 4vw, 2.75rem);
}
.contact-intro p {
	color: var(--ink-soft);
	margin-top: var(--space-2);
	max-width: 42ch;
}
.contact-direct {
	margin-top: var(--space-4);
	padding-top: var(--space-3);
	border-top: 1px solid var(--line);
}
.contact-direct dt {
	font-size: 0.8rem;
	color: var(--ink-faint);
}
.contact-direct dd {
	font-family: var(--font-mono);
	margin-top: 0.2rem;
	margin-bottom: var(--space-2);
}
.contact-direct dd a {
	color: var(--blueprint);
}

.field {
	margin-bottom: var(--space-3);
}
.field label {
	display: block;
	font-size: 0.85rem;
	color: var(--ink-soft);
	margin-bottom: 0.35rem;
}
.field input,
.field textarea {
	width: 100%;
	background: var(--paper);
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	padding: 0.65rem 0.75rem;
}
.field input:focus,
.field textarea:focus {
	border-color: var(--blueprint);
}
.field textarea {
	min-height: 140px;
	resize: vertical;
}

/* Honeypot field: hidden from sighted users and keyboard/tab order,
   but still present in the DOM for simple bots that fill every field. */
.field-trap {
	position: absolute;
	left: -9999px;
	top: -9999px;
	width: 1px;
	height: 1px;
	overflow: hidden;
}

.form-note {
	font-size: 0.82rem;
	color: var(--ink-faint);
	margin-top: var(--space-2);
}
.form-status {
	margin-top: var(--space-2);
	font-size: 0.9rem;
}
.form-status[data-state='success'] {
	color: var(--signal-dark);
}
.form-status[data-state='error'] {
	color: #a33636;
}

@media (max-width: 820px) {
	.contact-grid {
		grid-template-columns: 1fr;
		gap: var(--space-4);
	}
}