:root {
	--theme-transition: 420ms;
	--theme-ease: cubic-bezier(0.22, 1, 0.36, 1);
	--asset-fade-duration: 180ms;

	/* Semantic palette from Pseudocode Styling (light mode). */
	--brand-primary: #5ec8ff;
	--brand-primary-rgb: 94, 200, 255;
	--brand-primary-variant: #1f7bbf;
	--brand-primary-variant-rgb: 31, 123, 191;
	--brand-primary-dark: #071b33;
	--brand-primary-dark-rgb: 7, 27, 51;
	--accent-primary: #ffb347;
	--accent-primary-rgb: 255, 179, 71;
	--accent-analytic: #6f63ff;
	--accent-analytic-rgb: 111, 99, 255;
	--semantic-success: #35c58a;
	--semantic-success-rgb: 53, 197, 138;
	--semantic-error: #ff4a5c;
	--semantic-error-rgb: 255, 74, 92;
	--background-base: #f5f7fb;
	--background-base-rgb: 245, 247, 251;
	--light-white: #fafbfc;
	--darker-white: #e8eaed;

	/* Usage-safe surfaces and text. */
	--bg-deep: color-mix(in srgb, var(--background-base) 82%, var(--brand-primary) 18%);
	--text: color-mix(in srgb, var(--brand-primary-dark) 86%, black 14%);
	--muted: color-mix(in srgb, var(--brand-primary-variant) 74%, var(--brand-primary-dark) 26%);
	--panel: rgba(var(--background-base-rgb), 0.82);
	--line: rgba(var(--brand-primary-variant-rgb), 0.24);
	--shadow: 0 18px 44px rgba(var(--brand-primary-dark-rgb), 0.18);
}

body.theme-dark {
	--brand-primary: #78d6ff;
	--brand-primary-rgb: 120, 214, 255;
	--brand-primary-variant: #4fa6e3;
	--brand-primary-variant-rgb: 79, 166, 227;
	--brand-primary-dark: #050f1f;
	--brand-primary-dark-rgb: 5, 15, 31;
	--accent-primary: #ffc46b;
	--accent-primary-rgb: 255, 196, 107;
	--accent-analytic: #8b82ff;
	--accent-analytic-rgb: 139, 130, 255;
	--semantic-success: #4ddaa0;
	--semantic-success-rgb: 77, 218, 160;
	--semantic-error: #ff6b7a;
	--semantic-error-rgb: 255, 107, 122;
	--background-base: #050e1a;
	--background-base-rgb: 5, 14, 26;
	--light-white: #e8eaed;
	--darker-white: #c4c8cc;

	/* Usage-safe surfaces and text in dark mode. */
	--bg-deep: color-mix(in srgb, var(--background-base) 78%, var(--brand-primary) 22%);
	--text: color-mix(in srgb, white 92%, var(--brand-primary) 8%);
	--muted: color-mix(in srgb, var(--brand-primary) 56%, var(--background-base) 44%);
	--panel: rgba(var(--brand-primary-dark-rgb), 0.74);
	--line: rgba(var(--brand-primary-rgb), 0.26);
	--shadow: 0 22px 60px rgba(var(--brand-primary-dark-rgb), 0.48);
}

* {
	box-sizing: border-box;
}

html,
body {
	margin: 0;
	padding: 0;
}

body {
	font-family: "Space Grotesk", "Avenir Next", sans-serif;
	color: var(--text);
	background: var(--background-base);
	min-height: 100vh;
	transition: background var(--theme-transition) var(--theme-ease), color var(--theme-transition) var(--theme-ease);
	overflow-x: hidden;
}

body::before,
body::after {
	content: "";
	position: fixed;
	inset: 0;
	pointer-events: none;
	z-index: -3;
	transition: opacity 620ms var(--theme-ease);
}

body::before {
	background:
		radial-gradient(circle at 80% 8%, rgba(94, 200, 255, 0.35), transparent 38%),
		radial-gradient(circle at 12% 92%, rgba(255, 179, 71, 0.22), transparent 42%),
		linear-gradient(180deg, #f5f7fb, color-mix(in srgb, #f5f7fb 82%, #5ec8ff 18%));
	opacity: 1;
}

body::after {
	background:
		radial-gradient(circle at 80% 8%, rgba(120, 214, 255, 0.35), transparent 38%),
		radial-gradient(circle at 12% 92%, rgba(255, 196, 107, 0.22), transparent 42%),
		linear-gradient(180deg, #050e1a, color-mix(in srgb, #050e1a 78%, #78d6ff 22%));
	opacity: 0;
}

body.theme-dark::before {
	opacity: 0;
}

body.theme-dark::after {
	opacity: 1;
}

.aurora,
.grid-overlay,
.theme-icon,
.theme-icon span,
.hero-kicker,
.hero-subtitle,
.btn-primary,
.btn,
.brand-wordmark {
	transition:
		color var(--theme-transition) var(--theme-ease),
		background-color var(--theme-transition) var(--theme-ease),
		border-color var(--theme-transition) var(--theme-ease),
		box-shadow var(--theme-transition) var(--theme-ease),
		opacity 620ms var(--theme-ease),
		filter var(--theme-transition) var(--theme-ease);
}

.aurora,
.grid-overlay {
	position: fixed;
	inset: 0;
	pointer-events: none;
	z-index: -1;
}

.aurora {
	background: conic-gradient(
		from 120deg at 50% 50%,
		rgba(var(--brand-primary-variant-rgb), 0.2),
		rgba(var(--accent-analytic-rgb), 0.16),
		rgba(var(--accent-primary-rgb), 0.14),
		rgba(var(--brand-primary-rgb), 0.2)
	);
	filter: blur(90px);
	animation: drift 16s linear infinite;
}

.grid-overlay {
	background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
	background-size: 34px 34px;
	opacity: 0.35;
}

main {
	width: min(900px, calc(100% - 2rem));
	margin: 0 auto;
	padding-bottom: 2rem;
}

.theme-icon {
	position: fixed;
	right: 1rem;
	top: 1rem;
	width: 56px;
	height: 56px;
	border-radius: 999px;
	border: 1px solid var(--line);
	background: var(--panel);
	box-shadow: var(--shadow);
	display: grid;
	place-items: center;
	padding: 0;
	cursor: pointer;
	z-index: 10;
	transition:
		transform 180ms ease,
		border-color var(--theme-transition) var(--theme-ease),
		background-color var(--theme-transition) var(--theme-ease),
		box-shadow var(--theme-transition) var(--theme-ease);
}

.theme-icon:hover {
	transform: translateY(-1px);
	border-color: var(--brand-primary-variant);
}

.theme-icon span {
	font-size: 1.4rem;
	line-height: 1;
	font-weight: 700;
	color: var(--text);
}

.hero-center {
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	text-align: center;
	padding: 5.5rem 0 3rem;
	gap: 0.9rem;
}

.logo-core {
	width: clamp(170px, 24vw, 280px);
	height: clamp(170px, 24vw, 280px);
	border-radius: 26%;
	display: grid;
	place-items: center;
	background: transparent;
	box-shadow: none;
	animation: pulse 2.4s ease-in-out infinite;
}

.logo-core img {
	width: 76%;
	height: 76%;
	object-fit: contain;
}

.brand-wordmark {
	width: min(540px, 84vw);
	height: auto;
	object-fit: contain;
	filter: drop-shadow(0 10px 22px rgba(var(--brand-primary-dark-rgb), 0.2));
}

.hero-kicker {
	margin: 0;
	font-size: 0.84rem;
	letter-spacing: 0.2em;
	text-transform: uppercase;
	color: var(--muted);
	font-weight: 700;
}

.hero-subtitle {
	max-width: 64ch;
	margin: 0;
	color: var(--muted);
	font-size: clamp(1rem, 2vw, 1.2rem);
}

.badge-shields {
	display: flex;
	gap: 0.6rem;
	justify-content: center;
	align-items: center;
	flex-wrap: wrap;
	margin-top: 1.2rem;
	margin-bottom: 1.2rem;
}

.badge-shields img {
	display: block;
	height: auto;
	max-height: 24px;
	transition: transform var(--theme-transition) var(--theme-ease);
}

.badge-shields img:hover {
	transform: scale(1.1);
}

.hero-actions {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
	justify-content: center;
	align-items: center;
	margin-top: 0.8rem;
}

.warning-banner {
	margin-top: 1.2rem;
	padding: 0.75rem 1rem;
	text-align: center;
	border-radius: 8px;
	background-color: rgba(var(--accent-primary-rgb), 0.15);
	border: 1px solid var(--accent-primary);
}

.warning-banner p {
	margin: 0;
	font-size: 0.9rem;
	color: #c97000;
	font-weight: 600;
}

body.theme-dark .warning-banner p {
	color: var(--accent-primary);
}

.github-warning {
	margin: 0;
	text-align: center;
	font-size: 0.88rem;
	font-weight: 600;
	color: var(--accent-primary);
}

.status-badges {
	display: flex;
	gap: 0.75rem;
	justify-content: center;
	align-items: center;
	flex-wrap: wrap;
	margin: 0.5rem 0;
}

.status-badges a {
	display: inline-flex;
	align-items: center;
	text-decoration: none;
	border-radius: 4px;
	overflow: hidden;
}

.status-badges img {
	display: block;
	height: auto;
	max-height: 28px;
	transition: transform var(--theme-transition) var(--theme-ease);
}

.status-badges a:hover img {
	transform: scale(1.05);
}

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.75rem 1.1rem;
	border-radius: 999px;
	text-decoration: none;
	font-weight: 700;
	border: 1px solid transparent;
}

.btn-primary {
	background: linear-gradient(130deg, var(--brand-primary), var(--brand-primary-variant));
	color: var(--brand-primary-dark);
}

.btn-github {
	width: auto;
	height: 52px;
	padding: 0 1rem;
	border-radius: 999px;
}

.btn-github img {
	width: 98px;
	height: auto;
	object-fit: contain;
	transition: opacity var(--asset-fade-duration) var(--theme-ease);
}

.is-fading {
	opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
	:root {
		--theme-transition: 0ms;
		--asset-fade-duration: 0ms;
	}

	.aurora {
		animation: none;
	}
}

.stripe {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 0.65rem;
	margin: 0 0 2rem;
	padding: 0.65rem;
	border-radius: 16px;
	background: var(--panel);
	border: 1px solid var(--line);
	box-shadow: var(--shadow);
	backdrop-filter: blur(8px);
}

.stripe p {
	margin: 0;
	font-size: 0.85rem;
	font-weight: 700;
	text-align: center;
	padding: 0.45rem;
	border-radius: 10px;
	background: rgba(var(--background-base-rgb), 0.34);
}

body.theme-dark .stripe p {
	background: rgba(var(--brand-primary-dark-rgb), 0.45);
}

/* Semantic usage helpers aligned with pseudocode guardrails. */
.status-success {
	color: var(--semantic-success);
}

.status-error {
	background: var(--semantic-error);
	color: #ffffff;
}

.chip-analytic {
	background: rgba(var(--accent-analytic-rgb), 0.18);
	color: var(--accent-analytic);
	border: 1px solid rgba(var(--accent-analytic-rgb), 0.35);
}

@media (max-width: 900px) {
	.stripe {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (max-width: 640px) {
	.theme-icon {
		width: 54px;
		height: 54px;
		right: 0.8rem;
		top: 0.8rem;
	}

	.hero-center {
		padding-top: 5rem;
	}

	.stripe {
		grid-template-columns: 1fr;
	}
}

@keyframes pulse {
	0%,
	100% {
		transform: translateY(0px);
	}
	50% {
		transform: translateY(-5px);
	}
}

@keyframes drift {
	from {
		transform: rotate(0deg) scale(1.05);
	}
	to {
		transform: rotate(360deg) scale(1.05);
	}
}