/* ══════════════════════════════════════════════════════════════════
   Avneesh Kasture — portfolio
   Refined dark "engineer" theme · IBM Plex Mono + IBM Plex Sans
   ══════════════════════════════════════════════════════════════════ */

:root {
	--bg:        #0b0e14;
	--bg-2:      #10141d;
	--panel:     #131824;
	--panel-2:   #171d2b;
	--line:      #232b3a;
	--line-soft: #1a2130;
	--ink:       #e6ebf2;
	--ink-dim:   #9aa6b8;
	--ink-faint: #7f8a9e; /* WCAG-AA contrast on the dark bg (was #626d80, ~3.7:1) */
	--acc:       #4fe3a1; /* phosphor green */
	--acc-2:     #4cc9f0; /* cyan */
	--warn:      #f5b544; /* amber */
	--bad:       #ff6b6b; /* red */
	--mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
	--sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
	--maxw: 1120px;
	--ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
	background: var(--bg);
	color: var(--ink);
	font-family: var(--sans);
	font-weight: 400;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	overflow-x: hidden;
	/* subtle dot grid + vignette */
	background-image:
		radial-gradient(circle at 50% -10%, rgba(76, 201, 240, 0.08), transparent 55%),
		radial-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px);
	background-size: auto, 26px 26px;
	background-attachment: fixed;
}

/* film-grain overlay */
.grain {
	position: fixed;
	inset: 0;
	z-index: 999;
	pointer-events: none;
	opacity: 0.035;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--acc); color: #06110c; }

/* ── a11y: visible keyboard focus everywhere ── */
:focus-visible {
	outline: 2px solid var(--acc);
	outline-offset: 3px;
	border-radius: 3px;
}

/* ── a11y: skip-to-content link (visible only when focused) ── */
.skip-link {
	position: absolute;
	top: 0.6rem;
	left: 0.6rem;
	z-index: 300;
	padding: 0.6rem 1rem;
	background: var(--acc);
	color: #06110c;
	font-family: var(--mono);
	font-size: 0.85rem;
	font-weight: 600;
	border-radius: 6px;
	transform: translateY(-160%);
	transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

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

.prompt { color: var(--acc); font-family: var(--mono); }

/* ─────────────────────────────── NAV ─────────────────────────────── */
.nav {
	position: sticky;
	top: 0;
	z-index: 100;
	display: flex;
	align-items: center;
	gap: 2rem;
	padding: 1rem clamp(1.25rem, 5vw, 3.5rem);
	background: rgba(11, 14, 20, 0.72);
	backdrop-filter: blur(12px);
	border-bottom: 1px solid var(--line-soft);
}

.nav-brand {
	font-family: var(--mono);
	font-weight: 600;
	font-size: 1rem;
	letter-spacing: -0.02em;
	white-space: nowrap;
}
.blink { animation: blink 1.15s steps(2) infinite; color: var(--acc); }
@keyframes blink { 0%, 50% { opacity: 1; } 50.01%, 100% { opacity: 0; } }

.nav-links {
	display: flex;
	align-items: center;
	gap: 1.75rem;
	margin-left: auto;
	font-family: var(--mono);
	font-size: 0.86rem;
}
.nav-links a {
	color: var(--ink-dim);
	position: relative;
	padding: 0.2rem 0;
	transition: color 0.25s var(--ease);
}
.nav-links a:not(.nav-resume)::after {
	content: "";
	position: absolute;
	left: 0; bottom: -2px;
	width: 100%; height: 1px;
	background: var(--acc);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.3s var(--ease);
}
.nav-links a:not(.nav-resume):hover,
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after,
.nav-links a:not(.nav-resume):hover::after { transform: scaleX(1); }

/* Off-SPA destination: a separate page, not an in-page scroll anchor.
   Divider + accent colour + ↗ signal it leaves the single-page site. */
.nav-links .nav-out {
	color: var(--acc);
	margin-left: 0.55rem;
	padding-left: 1.2rem;
	position: relative;
}
.nav-links .nav-out::before {
	content: "";
	position: absolute;
	left: 0;
	top: 50%;
	transform: translateY(-50%);
	width: 1px;
	height: 1em;
	background: var(--line);
}
.nav-links .nav-out:hover { color: #6bf0b4; }

.nav-resume {
	font-family: var(--mono);
	font-size: 0.82rem;
	color: var(--acc);
	border: 1px solid var(--line);
	padding: 0.4rem 0.85rem;
	border-radius: 6px;
	transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.nav-resume:hover { border-color: var(--acc); background: rgba(79, 227, 161, 0.08); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); transition: 0.3s var(--ease); }

/* ────────────────────────────── HERO ─────────────────────────────── */
.hero {
	position: relative;
	max-width: var(--maxw);
	margin: 0 auto;
	padding: clamp(3.5rem, 9vw, 7rem) clamp(1.25rem, 5vw, 3.5rem) clamp(3rem, 7vw, 5rem);
	display: grid;
	grid-template-columns: 1.05fr 0.95fr;
	gap: clamp(2rem, 5vw, 4rem);
	align-items: center;
}
.hero-glow {
	position: absolute;
	top: -10%; right: -5%;
	width: 480px; height: 480px;
	background: radial-gradient(circle, rgba(79, 227, 161, 0.16), transparent 68%);
	filter: blur(20px);
	pointer-events: none;
	z-index: -1;
}

.hero-kicker {
	font-family: var(--mono);
	color: var(--ink-dim);
	font-size: 0.95rem;
	margin-bottom: 1.25rem;
}
.hero-title {
	font-family: var(--mono);
	font-weight: 700;
	font-size: clamp(3rem, 9vw, 6rem);
	line-height: 0.95;
	letter-spacing: -0.04em;
	margin-bottom: 1.5rem;
	background: linear-gradient(180deg, #ffffff 30%, #b9c4d4 100%);
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
}
.hero-role {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.6rem;
	margin-bottom: 1.75rem;
}
.hero-role .tag {
	font-family: var(--mono);
	font-size: 0.9rem;
	color: var(--acc-2);
	border: 1px solid var(--line);
	border-radius: 999px;
	padding: 0.3rem 0.85rem;
	background: var(--panel);
}
.hero-role .slash { color: var(--ink-faint); font-family: var(--mono); }
.hero-blurb {
	max-width: 30rem;
	color: var(--ink-dim);
	font-size: 1.05rem;
	margin-bottom: 2rem;
}
.hero-blurb strong { color: var(--ink); font-weight: 500; }

.hero-cta { display: flex; gap: 0.9rem; flex-wrap: wrap; }
.btn {
	font-family: var(--mono);
	font-size: 0.9rem;
	padding: 0.72rem 1.35rem;
	border: 1px solid var(--line);
	border-radius: 8px;
	color: var(--ink);
	background: var(--panel);
	transition: transform 0.2s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--ink-faint); }
.btn-primary {
	background: var(--acc);
	color: #06110c;
	border-color: var(--acc);
	font-weight: 600;
}
.btn-primary:hover { background: #6bf0b4; border-color: #6bf0b4; }

/* terminal card */
.term {
	background: var(--panel);
	border: 1px solid var(--line);
	border-radius: 12px;
	overflow: hidden;
	box-shadow: 0 30px 70px -30px rgba(0, 0, 0, 0.8);
}
.term-bar {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.7rem 0.95rem;
	background: var(--panel-2);
	border-bottom: 1px solid var(--line);
}
.term-bar .dot { width: 11px; height: 11px; border-radius: 50%; background: #333c4d; }
.term-bar .dot:nth-child(1) { background: #ff5f57; }
.term-bar .dot:nth-child(2) { background: #febc2e; }
.term-bar .dot:nth-child(3) { background: #28c840; }
.term-title { margin-left: auto; font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint); }
.term-body {
	font-family: var(--mono);
	font-size: 0.82rem;
	line-height: 1.75;
	padding: 1.25rem 1.35rem;
	color: var(--ink-dim);
	white-space: pre-wrap;
	word-break: break-word;
}
.c-dim { color: var(--ink-faint); }
.c-key { color: var(--acc-2); }
.c-str { color: var(--acc); }
.c-ok  { color: var(--acc); font-weight: 500; }
.c-bad { color: var(--bad); font-weight: 500; }
.cursor { color: var(--acc); animation: blink 1.1s steps(2) infinite; }

/* ───────────────────────────── SECTIONS ──────────────────────────── */
.section {
	max-width: var(--maxw);
	margin: 0 auto;
	padding: clamp(3.5rem, 8vw, 6.5rem) clamp(1.25rem, 5vw, 3.5rem);
	border-top: 1px solid var(--line-soft);
}
.section-label {
	font-family: var(--mono);
	font-size: 0.82rem;
	color: var(--acc);
	margin-bottom: 1rem;
	letter-spacing: 0.02em;
}
.section-title {
	font-family: var(--mono);
	font-weight: 600;
	font-size: clamp(1.6rem, 4vw, 2.4rem);
	letter-spacing: -0.03em;
	margin-bottom: 2.5rem;
}

/* about */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.5rem, 5vw, 4rem); }
.about-grid .section-title { margin-bottom: 0; align-self: start; }
.about-body p { color: var(--ink-dim); margin-bottom: 1.1rem; font-size: 1.05rem; }
.about-body strong { color: var(--ink); font-weight: 500; }

/* timeline */
.timeline { list-style: none; position: relative; padding-left: 1.75rem; }
.timeline::before {
	content: "";
	position: absolute;
	left: 4px; top: 6px; bottom: 6px;
	width: 1px;
	background: linear-gradient(180deg, var(--acc), var(--line) 60%);
}
.tl-item { position: relative; padding-bottom: 2.5rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
	content: "";
	position: absolute;
	left: -1.75rem; top: 7px;
	width: 9px; height: 9px;
	border-radius: 50%;
	background: var(--acc);
	box-shadow: 0 0 0 4px rgba(79, 227, 161, 0.14);
	transform: translateX(0.5px);
}
.tl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 0.9rem; margin-bottom: 0.6rem; }
.tl-head h3 { font-size: 1.15rem; font-weight: 600; }
.tl-org { font-family: var(--mono); color: var(--acc-2); font-size: 0.9rem; }
.tl-meta { font-family: var(--mono); color: var(--ink-faint); font-size: 0.8rem; margin-left: auto; }
.tl-desc { color: var(--ink-dim); max-width: 62ch; }
.tl-desc strong { color: var(--ink); font-weight: 500; }

/* how i work */
.approach { list-style: none; display: grid; gap: 1.6rem; max-width: 60rem; }
.approach-step { display: flex; gap: 1.25rem; align-items: flex-start; }
.approach-num {
	font-family: var(--mono);
	color: var(--acc);
	font-size: 0.9rem;
	line-height: 1.55;
	flex-shrink: 0;
	width: 2.2rem;
}
.approach-step h3 { font-size: 1.12rem; font-weight: 600; margin-bottom: 0.35rem; }
.approach-step p { color: var(--ink-dim); max-width: 64ch; }

/* case study */
.cs { max-width: 62rem; }
.cs p { color: var(--ink-dim); margin-bottom: 1.1rem; max-width: 68ch; }
.cs .cs-lede { color: var(--ink); font-size: 1.12rem; }
.cs strong { color: var(--ink); font-weight: 600; }
.cs a { color: var(--acc); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line); }
.cs a:hover { text-decoration-color: var(--acc); }
.cs-sub { font-family: var(--mono); font-size: 0.85rem; color: var(--ink-faint) !important; margin-top: 1.75rem; }
.cs-map { list-style: none; display: grid; gap: 0; margin-bottom: 1.6rem; }
.cs-map li {
	display: grid;
	grid-template-columns: 1fr 1.4fr;
	gap: 1.25rem;
	padding: 0.75rem 0;
	border-bottom: 1px solid var(--line-soft);
	align-items: baseline;
}
.cs-threat { color: var(--bad); font-family: var(--mono); font-size: 0.88rem; }
.cs-ctrl { color: var(--ink-dim); font-size: 0.96rem; }
.cs-note { color: var(--ink-faint); font-size: 0.88rem; }
@media (max-width: 640px) {
	.cs-map li { grid-template-columns: 1fr; gap: 0.3rem; }
}

/* cards */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.card {
	background: var(--panel);
	border: 1px solid var(--line-soft);
	border-radius: 12px;
	padding: 1.6rem;
	display: flex;
	flex-direction: column;
	position: relative;
	overflow: hidden;
	transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.card::before {
	content: "";
	position: absolute;
	inset: 0 0 auto 0;
	height: 2px;
	background: linear-gradient(90deg, var(--acc), var(--acc-2));
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.4s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: var(--line); }
.card:hover::before { transform: scaleX(1); }
.card-feature { grid-column: 1 / -1; background: linear-gradient(135deg, var(--panel) 0%, var(--panel-2) 100%); }
.card-top { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.card-idx { font-family: var(--mono); color: var(--ink-faint); font-size: 0.85rem; }
.card-tags { font-family: var(--mono); font-size: 0.74rem; color: var(--acc-2); text-transform: lowercase; letter-spacing: 0.02em; }
.card-title { font-family: var(--mono); font-weight: 600; font-size: 1.4rem; letter-spacing: -0.02em; margin-bottom: 0.7rem; }
.card-feature .card-title { font-size: 1.85rem; }
.card-at { color: var(--ink-faint); font-weight: 400; font-size: 0.9rem; }
.card-desc { color: var(--ink-dim); font-size: 0.97rem; flex: 1; }
.card-desc strong { color: var(--ink); font-weight: 500; }
.card-links { display: flex; gap: 1.1rem; margin-top: 1.25rem; font-family: var(--mono); font-size: 0.85rem; }
.card-links a { color: var(--acc); transition: color 0.2s var(--ease); }
.card-links a:hover { color: #6bf0b4; }
.card-lock { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-faint); }
.card-mini { background: transparent; border-style: dashed; }

/* skills */
.skills-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; margin-bottom: 3rem; }
.skill-group { border: 1px solid var(--line-soft); border-radius: 10px; padding: 1.35rem; background: var(--bg-2); }
.skill-group h3 { font-family: var(--mono); font-size: 0.92rem; color: var(--acc); margin-bottom: 1rem; font-weight: 600; }
.skill-group ul { list-style: none; }
.skill-group li { color: var(--ink-dim); font-size: 0.93rem; padding: 0.28rem 0; border-bottom: 1px solid var(--line-soft); }
.skill-group li:last-child { border-bottom: 0; }

.creds { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.cred h4 { font-family: var(--mono); font-size: 0.85rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.8rem; }
.cred ul { list-style: none; }
.cred li { color: var(--ink-dim); font-size: 0.95rem; padding: 0.22rem 0; }
.cred a { color: var(--acc-2); }
.cred a:hover { text-decoration: underline; }

/* contact */
.section-contact { text-align: center; }
.contact-title { font-family: var(--mono); font-weight: 700; font-size: clamp(1.8rem, 6vw, 3.5rem); letter-spacing: -0.03em; margin-bottom: 2.5rem; }
.contact-links { display: flex; flex-direction: column; gap: 0.5rem; align-items: center; font-family: var(--mono); font-size: clamp(1rem, 2.5vw, 1.3rem); }
.contact-links a { color: var(--ink-dim); padding: 0.3rem 0; transition: color 0.25s var(--ease), letter-spacing 0.25s var(--ease); }
.contact-links a:hover { color: var(--acc); letter-spacing: 0.02em; }

.footer {
	margin-top: 4rem;
	padding-top: 1.5rem;
	border-top: 1px solid var(--line-soft);
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 0.5rem;
	font-family: var(--mono);
	font-size: 0.8rem;
	color: var(--ink-faint);
}
.footer-status { color: var(--acc); }

/* ─────────────────────────── REVEAL ANIM ─────────────────────────── */
[data-reveal] {
	opacity: 0;
	transform: translateY(18px);
	transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].in { opacity: 1; transform: none; }

/* ─────────────────────────── RESPONSIVE ──────────────────────────── */
@media (max-width: 860px) {
	.nav-links { display: none; }
	.nav-toggle { display: flex; }
	.nav.open .nav-links {
		display: flex;
		position: absolute;
		top: 100%; left: 0; right: 0;
		flex-direction: column;
		gap: 0;
		padding: 0.5rem 0;
		background: var(--bg-2);
		border-bottom: 1px solid var(--line);
	}
	.nav.open .nav-links a { padding: 0.85rem clamp(1.25rem, 5vw, 3.5rem); }
	.nav.open .nav-links .nav-out {
		margin-left: 0;
		padding-left: clamp(1.25rem, 5vw, 3.5rem);
		border-top: 1px solid var(--line-soft);
		margin-top: 0.3rem;
	}
	.nav.open .nav-links .nav-out::before { display: none; }
	/* résumé button becomes a normal dropdown row on mobile */
	.nav.open .nav-links .nav-resume {
		border: 0;
		border-top: 1px solid var(--line-soft);
		border-radius: 0;
		background: none;
		color: var(--acc);
		font-size: 0.86rem;
	}
	.hero { grid-template-columns: 1fr; }
	.about-grid { grid-template-columns: 1fr; }
	.cards { grid-template-columns: 1fr; }
	.card-feature { grid-column: auto; }
	.skills-grid { grid-template-columns: repeat(2, 1fr); }
	.creds { grid-template-columns: 1fr; }
	.tl-meta { margin-left: 0; width: 100%; }
}
@media (max-width: 460px) {
	.skills-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
	* { scroll-behavior: auto !important; }
	[data-reveal] { opacity: 1; transform: none; transition: none; }
	.blink, .cursor { animation: none; }
}