/* ==========================================================================
   KI-Plattform – Basis-Stylesheet
   Form follows function: klare Hierarchie, wenig Dekoration, die
   Facettenfilterung ist das eigentliche Produkt, nicht das Layout drumherum.
   ========================================================================== */

:root {
	--color-bg: #FAFAF8;
	--color-surface: #FFFFFF;
	--color-text: #1B1F23;
	--color-text-muted: #5B6570;
	--color-border: #E3E1DC;
	--color-primary: #1F4E5F;
	--color-primary-dark: #163A47;
	--color-primary-tint: #E7EFF1;
	--color-accent: #C96F3B;

	--tag-branche-bg: #E7EFF1; --tag-branche-fg: #1F4E5F;
	--tag-abteilung-bg: #F1EAE0; --tag-abteilung-fg: #7A4E23;
	--tag-tech-bg: #EAE7F5; --tag-tech-fg: #4B3B87;
	--tag-nutzen-bg: #E5F1E8; --tag-nutzen-fg: #2A6B3E;
	--tag-reife-bg: #F3F0EA; --tag-reife-fg: #6B5F4A;

	--font-sans: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
	--font-serif: "Source Serif 4", Georgia, serif;

	--radius: 6px;
	--container-width: 1180px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
	margin: 0;
	font-family: var(--font-sans);
	color: var(--color-text);
	background: var(--color-bg);
	line-height: 1.55;
	font-size: 16px;
}
h1, h2, h3, h4 {
	font-family: var(--font-serif);
	font-weight: 700;
	line-height: 1.2;
	margin: 0 0 .5em;
	color: var(--color-primary-dark);
}
p { margin: 0 0 1em; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible {
	outline: 3px solid var(--color-accent);
	outline-offset: 2px;
}
img { max-width: 100%; display: block; }

.screen-reader-text {
	position: absolute; width: 1px; height: 1px; overflow: hidden;
	clip: rect(1px,1px,1px,1px); white-space: nowrap;
}
.skip-link {
	position: absolute; left: -999px; top: 0; z-index: 999;
	background: var(--color-primary); color: #fff; padding: .75em 1.2em;
}
.skip-link:focus { left: 1em; top: 1em; width: auto; height: auto; clip: auto; }

.container {
	max-width: var(--container-width);
	margin: 0 auto;
	padding: 0 24px;
}

/* -------------------- Header / Footer -------------------- */
.site-header {
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-border);
	position: sticky; top: 0; z-index: 50;
}
.site-header__inner {
	display: flex; align-items: center; justify-content: space-between;
	padding: 18px 24px;
}
.site-header__logo {
	font-family: var(--font-serif); font-weight: 700; font-size: 1.25rem;
	color: var(--color-primary-dark); letter-spacing: -0.01em;
}
.site-header__logo-dot { color: var(--color-accent); }
.site-header__nav a {
	margin-left: 28px; color: var(--color-text); font-weight: 600; font-size: .95rem;
}
.site-header__nav a:hover { color: var(--color-primary); }

.site-footer {
	background: var(--color-primary-dark); color: #EDEDE9; margin-top: 64px;
}
.site-footer__inner { padding: 32px 24px; text-align: center; }
.site-footer__note { color: #B9C4C1; font-size: .9rem; margin: 0; }

/* -------------------- Hero / Startseite -------------------- */
.hero {
	background: linear-gradient(180deg, var(--color-primary-tint) 0%, var(--color-bg) 100%);
	padding: 72px 0 56px;
	border-bottom: 1px solid var(--color-border);
}
.hero__eyebrow {
	text-transform: uppercase; letter-spacing: .08em; font-size: .8rem;
	font-weight: 700; color: var(--color-accent); margin-bottom: 14px;
}
.hero h1 { font-size: clamp(2rem, 4vw, 2.9rem); max-width: 15ch; }
.hero p.hero__lead { font-size: 1.15rem; color: var(--color-text-muted); max-width: 60ch; }
.hero__cta {
	display: inline-block; margin-top: 8px; background: var(--color-primary);
	color: #fff; padding: 14px 28px; border-radius: var(--radius); font-weight: 700;
}
.hero__cta:hover { background: var(--color-primary-dark); text-decoration: none; }

.stats-row {
	display: flex; gap: 40px; margin-top: 40px; flex-wrap: wrap;
}
.stats-row__item .stats-row__num {
	font-family: var(--font-serif); font-size: 2.2rem; font-weight: 700; color: var(--color-primary-dark);
	display: block;
}
.stats-row__item .stats-row__label { color: var(--color-text-muted); font-size: .9rem; }

.section { padding: 56px 0; }
.section h2 { font-size: 1.7rem; }
.section--muted { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }

.dimension-grid {
	display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
	gap: 20px; margin-top: 28px;
}
.dimension-card {
	background: var(--color-surface); border: 1px solid var(--color-border);
	border-radius: var(--radius); padding: 20px;
}
.dimension-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.dimension-card p { color: var(--color-text-muted); font-size: .92rem; margin: 0; }

/* -------------------- Archiv: Filter + Ergebnisse -------------------- */
.archive-header { padding: 48px 0 24px; border-bottom: 1px solid var(--color-border); background: var(--color-surface); }
.archive-header h1 { margin-bottom: 6px; }
.archive-header p { color: var(--color-text-muted); margin: 0; }

.archive-layout {
	display: grid;
	grid-template-columns: 280px 1fr;
	gap: 40px;
	padding: 40px 0 80px;
	align-items: start;
}
@media (max-width: 860px) {
	.archive-layout { grid-template-columns: 1fr; }
}

.filter-panel {
	background: var(--color-surface); border: 1px solid var(--color-border);
	border-radius: var(--radius); padding: 20px; position: sticky; top: 90px;
}
.filter-panel__header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.filter-panel__header h2 { font-size: 1.05rem; margin: 0; font-family: var(--font-sans); }
.filter-reset { font-size: .85rem; color: var(--color-text-muted); background: none; border: none; cursor: pointer; padding: 0; text-decoration: underline; }

.filter-group { border-top: 1px solid var(--color-border); padding: 14px 0; }
.filter-group summary {
	font-weight: 700; font-size: .92rem; cursor: pointer; list-style: none;
	display: flex; justify-content: space-between; align-items: center;
}
.filter-group summary::-webkit-details-marker { display: none; }
.filter-group summary::after { content: "+"; color: var(--color-text-muted); font-weight: 400; }
.filter-group[open] summary::after { content: "\2212"; }
.filter-group__options { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.filter-option { display: flex; align-items: center; gap: 8px; font-size: .9rem; }
.filter-option input { accent-color: var(--color-primary); }
.filter-option label { cursor: pointer; }

.results-toolbar {
	display: flex; justify-content: space-between; align-items: center;
	margin-bottom: 20px; color: var(--color-text-muted); font-size: .92rem;
}
#fall-count strong { color: var(--color-text); }

.fall-grid {
	display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
	gap: 20px;
}
.fall-card {
	background: var(--color-surface); border: 1px solid var(--color-border);
	border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column;
}
.fall-card__title { font-size: 1.08rem; margin-bottom: 4px; }
.fall-card__title a { color: var(--color-primary-dark); }
.fall-card__meta { color: var(--color-text-muted); font-size: .85rem; margin-bottom: 10px; }
.fall-card__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.fall-card__excerpt { color: var(--color-text); font-size: .93rem; flex-grow: 1; }
.fall-card__link { font-weight: 700; font-size: .88rem; margin-top: auto; }
.fall-empty { grid-column: 1 / -1; color: var(--color-text-muted); padding: 40px 0; text-align: center; }

.tag {
	display: inline-block; padding: 3px 10px; border-radius: 999px;
	font-size: .74rem; font-weight: 700; white-space: nowrap;
}
.tag--branche { background: var(--tag-branche-bg); color: var(--tag-branche-fg); }
.tag--abteilung { background: var(--tag-abteilung-bg); color: var(--tag-abteilung-fg); }
.tag--tech { background: var(--tag-tech-bg); color: var(--tag-tech-fg); }
.tag--nutzen { background: var(--tag-nutzen-bg); color: var(--tag-nutzen-fg); }
.tag--reife { background: var(--tag-reife-bg); color: var(--tag-reife-fg); }

/* -------------------- Einzelfall -------------------- */
.fall-single { padding: 48px 0 80px; }
.fall-single__breadcrumb { font-size: .88rem; color: var(--color-text-muted); margin-bottom: 18px; }
.fall-single__header { max-width: 68ch; margin-bottom: 28px; }
.fall-single__meta { color: var(--color-text-muted); margin-bottom: 14px; }
.fall-single__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.fall-single__pitch { font-size: 1.15rem; color: var(--color-text); }

.fall-single__body {
	display: grid; grid-template-columns: 2fr 1fr; gap: 48px; align-items: start;
}
@media (max-width: 860px) { .fall-single__body { grid-template-columns: 1fr; } }

.fall-single__content { max-width: 70ch; font-size: 1.02rem; }
.fall-single__content h2 { font-size: 1.3rem; margin-top: 1.6em; }

.fall-single__sidebar {
	background: var(--color-surface); border: 1px solid var(--color-border);
	border-radius: var(--radius); padding: 22px;
}
.fall-single__sidebar h3 { font-size: .95rem; margin-bottom: 10px; }
.fall-single__sidebar ul { margin: 0 0 20px; padding-left: 18px; font-size: .92rem; }
.fall-single__sidebar li { margin-bottom: 6px; }
.source-list { list-style: none; padding: 0; margin: 0; }
.source-list li { margin-bottom: 10px; font-size: .88rem; padding-left: 0; }

.back-link { display: inline-block; margin-top: 8px; font-weight: 600; }