/* ==========================================================================
   Hack For the World — stylesheet

   1.  Fonts
   2.  Design tokens
   3.  Base & layout primitives
   4.  Buttons, chips, eyebrows
   5.  Site navigation
   6.  Hero
   7.  About
   8.  FAQ
   9.  Sponsors
   10. Call to action
   11. Venue page
   12. Footer
   13. Motion & print preferences
   ========================================================================== */

/* 1. Fonts ---------------------------------------------------------------- */

@font-face {
	font-family: "Bio Sans";
	src: url("../fonts/Bio-Sans.woff2") format("woff2"),
	     url("../fonts/Bio-Sans.woff") format("woff");
	font-weight: 400;
	font-display: swap;
}

@font-face {
	font-family: "Bio Sans";
	src: url("../fonts/Bio-Sans-Bold.woff2") format("woff2"),
	     url("../fonts/Bio-Sans-Bold.woff") format("woff");
	font-weight: 700;
	font-display: swap;
}

/* 2. Design tokens -------------------------------------------------------- */

:root {
	/* Brand palette, sampled from the HackFTW logo */
	--navy-900: #010e30;
	--navy-800: #07193f;
	--navy-700: #0f2857;
	--blue-700: #0043ab;
	--blue-600: #0052d4;
	--blue-500: #0065ff;
	--blue-400: #3a8bff;
	--blue-100: #d6e5ff;
	--blue-50:  #eff5ff;
	--lime-600: #3fae10;
	--lime-500: #4ed613;
	--lime-400: #7ce84a;
	--lime-50:  #effbe6;

	--ink:       #0d1b34;
	--ink-soft:  #4a5a78;
	--paper:     #ffffff;
	--paper-alt: #f4f8ff;
	--line:      #dde6f5;

	/* Typography */
	--font-display: "Bio Sans", "Space Grotesk", system-ui, sans-serif;
	--font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
	--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

	--step--1: clamp(0.82rem, 0.79rem + 0.15vw, 0.9rem);
	--step-0:  clamp(1rem, 0.96rem + 0.2vw, 1.12rem);
	--step-1:  clamp(1.15rem, 1.08rem + 0.35vw, 1.4rem);
	--step-2:  clamp(1.4rem, 1.25rem + 0.7vw, 1.9rem);
	--step-3:  clamp(1.8rem, 1.5rem + 1.4vw, 2.75rem);
	--step-4:  clamp(2.3rem, 1.6rem + 3.2vw, 4.5rem);

	/* Space & shape */
	--container: 1180px;
	--gutter: clamp(1.25rem, 5vw, 4rem);
	--section-y: clamp(3.5rem, 8vw, 7rem);
	--radius-sm: 10px;
	--radius: 18px;
	--radius-lg: 28px;
	--radius-pill: 999px;

	--shadow-sm: 0 1px 2px rgba(1, 14, 48, 0.06), 0 2px 8px rgba(1, 14, 48, 0.05);
	--shadow-md: 0 6px 16px rgba(1, 14, 48, 0.08), 0 2px 4px rgba(1, 14, 48, 0.05);
	--shadow-lg: 0 18px 44px rgba(1, 14, 48, 0.16);
	--shadow-blue: 0 10px 26px rgba(0, 101, 255, 0.28);

	--ease: cubic-bezier(0.2, 0.8, 0.2, 1);
	--nav-h: 72px;
}

/* 3. Base & layout primitives --------------------------------------------- */

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

html {
	scroll-behavior: smooth;
	scroll-padding-top: calc(var(--nav-h) + 1rem);
	-webkit-text-size-adjust: 100%;
}

body {
	margin: 0;
	background: var(--paper);
	color: var(--ink);
	font-family: var(--font-body);
	font-size: var(--step-0);
	line-height: 1.65;
	overflow-x: hidden;
	-webkit-font-smoothing: antialiased;
}

img {
	max-width: 100%;
	display: block;
}

a {
	color: var(--blue-600);
	text-decoration-thickness: 2px;
	text-underline-offset: 3px;
}

a:hover {
	color: var(--blue-500);
}

:focus-visible {
	outline: 3px solid var(--lime-500);
	outline-offset: 3px;
	border-radius: 4px;
}

h1, h2, h3 {
	font-family: var(--font-display);
	font-weight: 700;
	line-height: 1.08;
	letter-spacing: -0.015em;
	margin: 0;
}

h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); }

p { margin: 0; }

.container {
	width: 100%;
	max-width: var(--container);
	margin-inline: auto;
	padding-inline: var(--gutter);
}

.section {
	padding-block: var(--section-y);
}

.section--tint {
	background: var(--paper-alt);
	border-block: 1px solid var(--line);
}

.section__head {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
	margin-bottom: clamp(2rem, 4vw, 3rem);
}

.lede {
	font-size: var(--step-1);
	color: var(--ink-soft);
	max-width: 62ch;
}

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

.skip-link {
	position: absolute;
	left: 50%;
	top: 0.5rem;
	translate: -50% -300%;
	z-index: 100;
	background: var(--navy-900);
	color: #fff;
	padding: 0.6rem 1.2rem;
	border-radius: var(--radius-pill);
	text-decoration: none;
	transition: translate 0.2s var(--ease);
}

.skip-link:focus-visible {
	translate: -50% 0;
	color: #fff;
}

/* 4. Buttons, chips, eyebrows --------------------------------------------- */

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	font-family: var(--font-display);
	font-weight: 700;
	font-size: var(--step-0);
	letter-spacing: 0.01em;
	line-height: 1;
	padding: 1rem 1.75rem;
	border-radius: var(--radius-pill);
	border: 2px solid transparent;
	text-decoration: none;
	cursor: pointer;
	transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
	            background-color 0.2s var(--ease), color 0.2s var(--ease),
	            border-color 0.2s var(--ease);
}

.btn:hover {
	transform: translateY(-2px);
}

.btn:active {
	transform: translateY(0);
}

.btn--primary {
	background: var(--blue-500);
	border-color: var(--blue-500);
	color: #fff;
	box-shadow: var(--shadow-blue);
}

.btn--primary:hover {
	background: var(--blue-600);
	border-color: var(--blue-600);
	color: #fff;
	box-shadow: 0 14px 32px rgba(0, 101, 255, 0.36);
}

.btn--lime {
	background: var(--lime-500);
	border-color: var(--lime-500);
	color: var(--navy-900);
	box-shadow: 0 10px 26px rgba(78, 214, 19, 0.3);
}

.btn--lime:hover {
	background: var(--lime-400);
	border-color: var(--lime-400);
	color: var(--navy-900);
}

.btn--outline {
	border-color: rgba(255, 255, 255, 0.55);
	color: #fff;
	background: rgba(255, 255, 255, 0.06);
	backdrop-filter: blur(6px);
}

.btn--outline:hover {
	border-color: #fff;
	background: rgba(255, 255, 255, 0.16);
	color: #fff;
}

.btn--sm {
	padding: 0.65rem 1.25rem;
	font-size: var(--step--1);
}

.btn__arrow {
	transition: transform 0.2s var(--ease);
}

.btn:hover .btn__arrow {
	transform: translateX(3px);
}

.eyebrow {
	font-family: var(--font-mono);
	font-size: var(--step--1);
	font-weight: 500;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--blue-600);
	display: flex;
	align-items: center;
	gap: 0.6rem;
}

.eyebrow::before {
	content: "";
	width: 1.75rem;
	height: 3px;
	border-radius: 2px;
	background: var(--lime-500);
	flex: none;
}

.eyebrow--light {
	color: var(--lime-400);
}

.chip {
	display: inline-flex;
	align-items: center;
	gap: 0.55rem;
	padding: 0.5rem 1rem;
	border-radius: var(--radius-pill);
	background: rgba(255, 255, 255, 0.1);
	border: 1px solid rgba(255, 255, 255, 0.24);
	font-size: var(--step--1);
	font-weight: 500;
	color: #fff;
	backdrop-filter: blur(8px);
}

.chip__dot {
	width: 8px;
	height: 8px;
	border-radius: 50%;
	background: var(--lime-500);
	box-shadow: 0 0 0 4px rgba(78, 214, 19, 0.22);
	flex: none;
}

.chip--tbd .chip__dot {
	animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
	0%, 100% { box-shadow: 0 0 0 0 rgba(78, 214, 19, 0.5); }
	50%      { box-shadow: 0 0 0 8px rgba(78, 214, 19, 0); }
}

/* 5. Site navigation ------------------------------------------------------ */

.site-nav {
	position: sticky;
	top: 0;
	z-index: 50;
	background: rgba(255, 255, 255, 0.86);
	backdrop-filter: blur(14px);
	border-bottom: 1px solid var(--line);
	transition: box-shadow 0.25s var(--ease), background-color 0.25s var(--ease);
}

.site-nav.is-scrolled {
	box-shadow: var(--shadow-md);
	background: rgba(255, 255, 255, 0.95);
}

.site-nav__inner {
	min-height: var(--nav-h);
	display: flex;
	align-items: center;
	gap: 1rem;
}

.site-nav__brand {
	margin-right: auto;
	display: inline-flex;
	align-items: center;
	border-radius: var(--radius-sm);
}

.site-nav__logo {
	height: clamp(26px, 5vw, 38px);
	width: auto;
	transition: transform 0.2s var(--ease);
}

.site-nav__brand:hover .site-nav__logo {
	transform: scale(1.04);
}

.site-nav__links {
	display: flex;
	align-items: center;
	gap: clamp(0.5rem, 2vw, 1.5rem);
	list-style: none;
	margin: 0;
	padding: 0;
}

.site-nav__link {
	position: relative;
	display: inline-block;
	padding: 0.5rem 0.25rem;
	font-weight: 600;
	font-size: var(--step--1);
	color: var(--ink);
	text-decoration: none;
	transition: color 0.2s var(--ease);
}

.site-nav__link::after {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 3px;
	border-radius: 2px;
	background: var(--lime-500);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.2s var(--ease);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
	color: var(--blue-600);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
	transform: scaleX(1);
}

@media (max-width: 36rem) {
	.site-nav__cta {
		display: none;
	}
}

/* 6. Hero ----------------------------------------------------------------- */

.hero {
	position: relative;
	isolation: isolate;
	color: #fff;
	padding-block: clamp(4rem, 12vw, 8.5rem);
	background-color: var(--navy-900);
	background-image: url("../img/backgrounds/skyline.png");
	background-image: image-set(
		url("../img/backgrounds/skyline.webp") type("image/webp"),
		url("../img/backgrounds/skyline.png") type("image/png"));
	background-size: cover;
	background-position: center;
	overflow: hidden;
}

.hero::before {
	content: "";
	position: absolute;
	inset: 0;
	z-index: -2;
	background:
		radial-gradient(60% 70% at 18% 8%, rgba(0, 101, 255, 0.55), transparent 65%),
		radial-gradient(45% 55% at 92% 88%, rgba(78, 214, 19, 0.26), transparent 70%),
		linear-gradient(170deg, rgba(1, 14, 48, 0.86), rgba(1, 14, 48, 0.94));
}

/* Faint blueprint grid, for a bit of hacker-lab texture. */
.hero::after {
	content: "";
	position: absolute;
	inset: 0;
	z-index: -1;
	background-image:
		linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
		linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
	background-size: 64px 64px;
	-webkit-mask-image: radial-gradient(75% 75% at 50% 40%, #000, transparent);
	mask-image: radial-gradient(75% 75% at 50% 40%, #000, transparent);
}

/* Sits inside .container so the hero copy lines up with every other section. */
.hero__inner {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	gap: 1.5rem;
	max-width: 52rem;
}

.hero__title {
	text-wrap: balance;
}

.hero__title em {
	font-style: normal;
	color: var(--lime-500);
}

.hero__meta {
	display: flex;
	flex-wrap: wrap;
	gap: 0.65rem;
}

.hero__note {
	color: rgba(255, 255, 255, 0.78);
	max-width: 48ch;
}

.hero__actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.85rem;
	margin-top: 0.5rem;
}

/* 7. About ---------------------------------------------------------------- */

.about__grid {
	display: grid;
	gap: clamp(1.5rem, 4vw, 3rem);
	grid-template-columns: minmax(0, 1fr);
	align-items: start;
}

@media (min-width: 55rem) {
	.about__grid {
		grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
	}
}

.about__body {
	font-size: var(--step-1);
	color: var(--ink-soft);
}

/* 8. FAQ ------------------------------------------------------------------ */

.faq-grid {
	display: grid;
	gap: 1.25rem;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
}

.faq-card {
	position: relative;
	overflow: hidden;
	background: var(--paper);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	padding: 1.75rem 1.5rem 1.5rem;
	box-shadow: var(--shadow-sm);
	transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
	            border-color 0.25s var(--ease);
}

.faq-card::before {
	content: "";
	position: absolute;
	inset: 0 0 auto 0;
	height: 4px;
	background: linear-gradient(90deg, var(--blue-500), var(--lime-500));
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.3s var(--ease);
}

.faq-card:hover {
	transform: translateY(-4px);
	border-color: var(--blue-100);
	box-shadow: var(--shadow-lg);
}

.faq-card:hover::before {
	transform: scaleX(1);
}

.faq-card__q {
	font-size: var(--step-1);
	margin-bottom: 0.6rem;
	color: var(--ink);
}

.faq-card__a {
	color: var(--ink-soft);
}

.faq-card__a a {
	font-weight: 600;
}

/* 9. Sponsors ------------------------------------------------------------- */

.sponsors__head {
	align-items: center;
	text-align: center;
}

.sponsors__logos {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: center;
	gap: clamp(1.5rem, 5vw, 4rem);
}

.sponsors__logo {
	height: clamp(40px, 7vw, 62px);
	width: auto;
	max-width: 11rem;
	object-fit: contain;
	filter: grayscale(1);
	opacity: 0.7;
	transition: filter 0.25s var(--ease), opacity 0.25s var(--ease),
	            transform 0.25s var(--ease);
}

.sponsors__logo:hover {
	filter: grayscale(0);
	opacity: 1;
	transform: scale(1.05);
}

/* 10. Call to action ------------------------------------------------------ */

.cta {
	position: relative;
	isolation: isolate;
	color: #fff;
	text-align: center;
	padding-block: clamp(3.5rem, 9vw, 6rem);
	background-color: var(--navy-900);
	background-image: url("../img/backgrounds/network.png");
	background-image: image-set(
		url("../img/backgrounds/network.webp") type("image/webp"),
		url("../img/backgrounds/network.png") type("image/png"));
	background-size: cover;
	background-position: center;
}

.cta::before {
	content: "";
	position: absolute;
	inset: 0;
	z-index: -1;
	background: linear-gradient(120deg, rgba(1, 14, 48, 0.9), rgba(0, 67, 171, 0.82));
}

.cta__inner {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 1.25rem;
}

.cta__title {
	text-wrap: balance;
}

.cta__note {
	color: rgba(255, 255, 255, 0.8);
	max-width: 48ch;
}

/* 11. Venue page ---------------------------------------------------------- */

.page-head {
	color: #fff;
	padding-block: clamp(3rem, 8vw, 5rem);
	background-color: var(--navy-900);
	background-image: radial-gradient(70% 130% at 12% 0%, var(--navy-700), var(--navy-900));
}

.page-head__inner {
	display: flex;
	flex-direction: column;
	gap: 1rem;
	align-items: flex-start;
}

.page-head .lede {
	color: rgba(255, 255, 255, 0.78);
}

.notice {
	display: flex;
	gap: 1rem;
	align-items: flex-start;
	padding: 1.25rem 1.5rem;
	border-radius: var(--radius);
	background: var(--lime-50);
	border: 1px solid rgba(78, 214, 19, 0.45);
	border-left: 5px solid var(--lime-500);
	color: var(--ink);
}

.notice__icon {
	font-size: 1.4rem;
	line-height: 1.3;
	flex: none;
}

.notice strong {
	display: block;
	font-family: var(--font-display);
	margin-bottom: 0.15rem;
}

.venue-map {
	border: 0;
	display: block;
	width: 100%;
	aspect-ratio: 16 / 9;
	min-height: 20rem;
	border-radius: var(--radius);
	box-shadow: var(--shadow-md);
	margin-top: clamp(2rem, 5vw, 3rem);
}

.venue-grid {
	display: grid;
	gap: 1.25rem;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
	margin-top: 1.25rem;
}

.venue-card {
	display: flex;
	flex-direction: column;
	justify-content: center;
	gap: 0.75rem;
	align-items: flex-start;
	background: var(--paper);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	padding: 1.75rem;
	box-shadow: var(--shadow-sm);
}

.venue-card p {
	color: var(--ink-soft);
}

.venue-card__address {
	font-style: normal;
	color: var(--ink-soft);
}

.venue-card--media {
	padding: 0;
	overflow: hidden;
}

.venue-card--media img {
	width: 100%;
	height: 100%;
	min-height: 15rem;
	object-fit: cover;
}

/* 12. Footer -------------------------------------------------------------- */

.site-footer {
	background: var(--navy-900);
	color: rgba(255, 255, 255, 0.72);
	padding-block: clamp(2.5rem, 6vw, 4rem);
	font-size: var(--step--1);
}

.site-footer__inner {
	display: flex;
	flex-wrap: wrap;
	gap: 1.5rem 2.5rem;
	align-items: center;
	justify-content: space-between;
}

.site-footer__logo {
	height: 34px;
	width: auto;
}

.site-footer__links {
	display: flex;
	flex-wrap: wrap;
	gap: 1.25rem;
	list-style: none;
	margin: 0;
	padding: 0;
}

.site-footer a {
	color: #fff;
	text-decoration: none;
	font-weight: 600;
}

.site-footer a:hover {
	color: var(--lime-400);
	text-decoration: underline;
}

.site-footer__fine {
	width: 100%;
	border-top: 1px solid rgba(255, 255, 255, 0.14);
	padding-top: 1.25rem;
	color: rgba(255, 255, 255, 0.55);
}

/* 13. Motion & print preferences ------------------------------------------ */

.reveal {
	opacity: 0;
	transform: translateY(18px);
	transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.reveal.is-visible {
	opacity: 1;
	transform: none;
}

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
	}

	.reveal {
		opacity: 1;
		transform: none;
	}
}

@media print {
	.site-nav,
	.cta {
		display: none;
	}

	body {
		color: #000;
	}
}