/*
 * Stylesheet der öffentlichen Website (ADR 0015). Markup folgt den Klassennamen von KERN UX
 * (kern-card, kern-btn, kern-title …); die Farbwerte spiegeln die Marken-Tokens aus
 * frontend/src/app.css, damit Website und App gleich aussehen. Mobile-first, Referenz 375 px.
 */
@font-face {
	font-family: Archivo;
	font-weight: 400;
	font-display: swap;
	src: url('/fonts/archivo-latin-400-normal.woff2') format('woff2');
}
@font-face {
	font-family: Archivo;
	font-weight: 600;
	font-display: swap;
	src: url('/fonts/archivo-latin-600-normal.woff2') format('woff2');
}

:root {
	--pp-brand: #1b3a6b;
	--pp-brand-strong: #142c52;
	--pp-signal: #f2b155;
	--pp-surface-0: #f7f8fa;
	--pp-surface-1: #ffffff;
	--pp-surface-2: #eef1f6;
	--pp-border-subtle: #dfe3ea;
	--pp-ink: #12161d;
	--pp-ink-muted: #525b6a;
	--pp-on-brand: #ffffff;
	--pp-radius: 12px;
	--pp-space-1: 0.5rem;
	--pp-space-2: 1rem;
	--pp-space-3: 1.5rem;
	--pp-space-4: 2.5rem;
	--pp-space-5: 4rem;
	--pp-font-family: Archivo, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
	color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
	:root {
		--pp-brand: #8fb3f5;
		--pp-brand-strong: #b7cffa;
		--pp-surface-0: #12161c;
		--pp-surface-1: #1a2029;
		--pp-surface-2: #212936;
		--pp-border-subtle: #2e3846;
		--pp-ink: #e8ecf2;
		--pp-ink-muted: #a9b3c1;
		--pp-on-brand: #0d1b33;
	}
}

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

body {
	margin: 0;
	font-family: var(--pp-font-family);
	font-size: 1rem;
	line-height: 1.55;
	color: var(--pp-ink);
	background: var(--pp-surface-0);
}

img {
	max-width: 100%;
	height: auto;
}

:focus-visible {
	outline: 3px solid var(--pp-brand);
	outline-offset: 2px;
}

.container {
	width: 100%;
	max-width: 72rem;
	margin: 0 auto;
	padding: 0 var(--pp-space-2);
}

.container--narrow {
	max-width: 46rem;
}

.skip-link {
	position: absolute;
	left: var(--pp-space-2);
	top: -4rem;
	padding: var(--pp-space-1) var(--pp-space-2);
	background: var(--pp-surface-1);
	color: var(--pp-ink);
	z-index: 10;
}

.skip-link:focus {
	top: var(--pp-space-1);
}

/* Kopf- und Fußzeile */
.site-header {
	background: var(--pp-surface-1);
	border-bottom: 1px solid var(--pp-border-subtle);
}

.site-header__inner {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: var(--pp-space-2);
	min-height: 4rem;
}

.brand {
	display: inline-flex;
	align-items: center;
	gap: var(--pp-space-1);
	color: var(--pp-ink);
	font-weight: 600;
	text-decoration: none;
}

.site-nav {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: flex-end;
	gap: var(--pp-space-1) var(--pp-space-2);
}

.site-nav__anchor {
	display: none;
}

.site-footer {
	padding: var(--pp-space-3) 0;
	border-top: 1px solid var(--pp-border-subtle);
	color: var(--pp-ink-muted);
	font-size: 0.9rem;
}

.site-footer__inner {
	display: flex;
	flex-wrap: wrap;
	gap: var(--pp-space-2);
}

.site-footer__languages {
	display: flex;
	flex-wrap: wrap;
	gap: var(--pp-space-1) var(--pp-space-2);
	margin: var(--pp-space-2) 0 0;
	padding: 0;
	list-style: none;
}

/* Sprachwahl ohne JavaScript: details/summary, Liste klappt unter dem Kopf auf */
.lang-menu {
	position: relative;
}

.lang-menu summary {
	display: flex;
	align-items: center;
	min-height: 44px;
	cursor: pointer;
	list-style: none;
}

.lang-menu summary::-webkit-details-marker {
	display: none;
}

.lang-menu summary::after {
	content: '▾';
	margin-left: 0.25rem;
}

.lang-menu__list {
	position: absolute;
	right: 0;
	z-index: 10;
	min-width: 10rem;
	margin: 0;
	padding: var(--pp-space-1) 0;
	list-style: none;
	background: var(--pp-surface-1);
	border: 1px solid var(--pp-border-subtle);
	border-radius: var(--pp-radius);
	box-shadow: 0 0.5rem 1.5rem rgb(20 44 82 / 0.15);
}

.lang-menu__list a {
	display: block;
	padding: 0.6rem var(--pp-space-2);
}

.lang-menu__list a[aria-current] {
	font-weight: 600;
}

/* KERN-Typografie */
.kern-preline {
	margin: 0 0 var(--pp-space-1);
	color: var(--pp-brand);
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	font-size: 0.85rem;
}

.kern-heading-display {
	margin: 0 0 var(--pp-space-2);
	font-size: clamp(2rem, 7vw, 3.25rem);
	line-height: 1.1;
}

.kern-heading-large {
	margin: 0 0 var(--pp-space-3);
	font-size: clamp(1.5rem, 4.5vw, 2.1rem);
	line-height: 1.2;
}

.kern-heading-medium {
	margin: var(--pp-space-3) 0 var(--pp-space-2);
	font-size: clamp(1.25rem, 3.5vw, 1.5rem);
	line-height: 1.25;
}

.kern-title {
	margin: 0 0 var(--pp-space-1);
	font-size: 1.15rem;
	line-height: 1.3;
}

.kern-body {
	margin: 0 0 var(--pp-space-2);
}

.kern-body--large {
	font-size: 1.15rem;
	color: var(--pp-ink-muted);
}

.kern-body--small {
	font-size: 0.9rem;
	color: var(--pp-ink-muted);
}

.kern-link {
	color: var(--pp-brand);
	text-underline-offset: 0.2em;
}

/* KERN-Buttons: Mindestgröße 44 px für Touch */
.kern-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 44px;
	padding: 0.6rem 1.25rem;
	border: 2px solid var(--pp-brand);
	border-radius: 999px;
	font-weight: 600;
	text-align: center;
	text-decoration: none;
}

.kern-btn--primary {
	background: var(--pp-brand);
	color: var(--pp-on-brand);
}

.kern-btn--primary:hover {
	background: var(--pp-brand-strong);
	border-color: var(--pp-brand-strong);
}

.kern-btn--secondary {
	background: transparent;
	color: var(--pp-brand);
}

.cta {
	font-size: 1.1rem;
	padding: 0.8rem 1.75rem;
}

/* Abschnitte */
.hero {
	padding: var(--pp-space-4) 0;
	background: linear-gradient(180deg, var(--pp-surface-1), var(--pp-surface-0));
}

.hero__inner {
	display: grid;
	gap: var(--pp-space-4);
	align-items: center;
}

.hero__actions {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--pp-space-2);
	margin: var(--pp-space-3) 0 var(--pp-space-1);
}

.shot {
	justify-self: center;
	max-width: 100%;
	max-height: 36rem;
	width: auto;
	height: auto;
	border-radius: 24px;
	box-shadow: 0 1rem 3rem rgb(20 44 82 / 0.18);
}

.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	overflow: hidden;
	clip-path: inset(50%);
	white-space: nowrap;
}

/* Häkchen-Liste für Selling Points (USP-Leiste und Funktionen) */
.checklist {
	margin: 0;
	padding: 0;
	list-style: none;
}

.checklist li {
	position: relative;
	padding-left: 1.75rem;
}

.checklist li + li {
	margin-top: var(--pp-space-1);
}

.checklist li::before {
	content: '✓';
	position: absolute;
	left: 0;
	color: var(--pp-brand);
	font-weight: 600;
}

.usp {
	padding: var(--pp-space-3) 0;
	background: var(--pp-brand);
	color: var(--pp-on-brand);
}

.usp .checklist li::before {
	color: var(--pp-signal);
}

.usp__list {
	display: grid;
	gap: var(--pp-space-1);
	font-weight: 600;
}

.usp__list li + li {
	margin-top: 0;
}

.features {
	display: grid;
	gap: var(--pp-space-5);
}

.feature-row {
	display: grid;
	gap: var(--pp-space-3);
	align-items: center;
}

.feature-row .kern-heading-medium {
	margin-top: 0;
}

.feature-row .shot {
	max-height: 30rem;
}

/* Beispiel-Chat der MCP-Funktion: nachgebaute Sprechblasen statt Screenshot eines fremden Produkts */
.chat {
	justify-self: center;
	width: 100%;
	max-width: 24rem;
	margin: 0;
	padding: var(--pp-space-2);
	background: var(--pp-surface-1);
	border: 1px solid var(--pp-border-subtle);
	border-radius: 24px;
	box-shadow: 0 1rem 3rem rgb(20 44 82 / 0.18);
}

.chat__caption {
	margin-bottom: var(--pp-space-2);
	color: var(--pp-ink-muted);
	font-size: 0.85rem;
	font-weight: 600;
	text-align: center;
}

.chat__list {
	display: flex;
	flex-direction: column;
	gap: var(--pp-space-1);
	margin: 0;
	padding: 0;
	list-style: none;
}

.chat__msg {
	max-width: 85%;
	padding: 0.6rem 0.9rem;
	border-radius: 18px;
	line-height: 1.4;
}

.chat__msg--user {
	align-self: flex-end;
	background: var(--pp-brand);
	color: var(--pp-on-brand);
	border-bottom-right-radius: 4px;
}

.chat__msg--assistant {
	align-self: flex-start;
	background: var(--pp-surface-2);
	color: var(--pp-ink);
	border-bottom-left-radius: 4px;
}

.chat__tool {
	align-self: flex-start;
	color: var(--pp-ink-muted);
	font-size: 0.8rem;
}

.chat__tool code {
	padding: 0.1rem 0.4rem;
	border: 1px solid var(--pp-border-subtle);
	border-radius: 6px;
}

.section {
	padding: var(--pp-space-5) 0;
}

.section--alt {
	background: var(--pp-surface-2);
}

.steps {
	display: grid;
	gap: var(--pp-space-3);
	margin: 0;
	padding: 0;
	list-style: none;
	counter-reset: step;
}

.steps li {
	counter-increment: step;
	padding-left: 3.25rem;
	position: relative;
}

.steps li::before {
	content: counter(step);
	position: absolute;
	left: 0;
	top: 0;
	display: grid;
	place-items: center;
	width: 2.25rem;
	height: 2.25rem;
	border-radius: 50%;
	background: var(--pp-signal);
	color: #3b2200;
	font-weight: 600;
}

.grid {
	display: grid;
	gap: var(--pp-space-2);
	margin-bottom: var(--pp-space-3);
}

/* KERN-Card */
.kern-card {
	background: var(--pp-surface-1);
	border: 1px solid var(--pp-border-subtle);
	border-radius: var(--pp-radius);
}

.kern-card__container {
	padding: var(--pp-space-3);
}

.kern-card__header hgroup {
	margin: 0;
}

.kern-card__body > :last-child {
	margin-bottom: 0;
}

.plan__price {
	margin: 0;
	font-size: 1rem;
	color: var(--pp-ink-muted);
}

.plan__price strong {
	font-size: 2rem;
	color: var(--pp-ink);
}

.plan__yearly,
.plan__includes {
	margin: 0 0 var(--pp-space-1);
	font-size: 0.9rem;
	color: var(--pp-ink-muted);
}

.plan__includes {
	margin-top: var(--pp-space-2);
	font-weight: 600;
}

.plan__features {
	margin: var(--pp-space-1) 0 0;
	padding-left: 1.25rem;
}

.plan__features li + li {
	margin-top: 0.35rem;
}

/* KERN-Accordion auf Basis von details/summary (ohne JS) */
.kern-accordion {
	background: var(--pp-surface-1);
	border: 1px solid var(--pp-border-subtle);
	border-radius: var(--pp-radius);
	margin-bottom: var(--pp-space-1);
}

.kern-accordion__header {
	display: flex;
	align-items: center;
	min-height: 44px;
	padding: var(--pp-space-2);
	cursor: pointer;
}

.kern-accordion__header .kern-heading-medium {
	margin: var(--pp-space-3) 0 var(--pp-space-2);
	font-size: clamp(1.25rem, 3.5vw, 1.5rem);
	line-height: 1.25;
}

.kern-title {
	margin: 0;
	font-size: 1.05rem;
}

.kern-accordion__body {
	padding: 0 var(--pp-space-2) var(--pp-space-1);
}

.final {
	text-align: center;
}

.imprint .kern-heading-medium {
	margin: var(--pp-space-3) 0 var(--pp-space-2);
	font-size: clamp(1.25rem, 3.5vw, 1.5rem);
	line-height: 1.25;
}

.kern-title {
	margin-top: var(--pp-space-3);
}

@media (min-width: 48rem) {
	.site-nav__anchor {
		display: inline;
	}

	.hero {
		padding: var(--pp-space-5) 0;
	}

	.hero__inner {
		grid-template-columns: 3fr 2fr;
	}

	.usp__list {
		grid-template-columns: repeat(2, 1fr);
		column-gap: var(--pp-space-4);
	}

	.feature-row {
		grid-template-columns: 3fr 2fr;
	}

	/* Bild und Text wechseln die Seite, damit das Auge im Zickzack durch die Funktionen läuft. */
	.feature-row:nth-child(even) {
		grid-template-columns: 2fr 3fr;
	}

	.feature-row:nth-child(even) .feature-row__text {
		order: 2;
	}

	.steps {
		grid-template-columns: repeat(3, 1fr);
	}

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

@media (min-width: 64rem) {
	.grid {
		grid-template-columns: repeat(3, 1fr);
	}

	.grid--plans {
		grid-template-columns: repeat(4, 1fr);
	}
}